JP7206998B2 - Wiring switch and insulation resistance measuring device - Google Patents

Description

The present invention relates to a wiring switch inserted between a mega ring filter and an insulation resistance meter, or to an insulation resistance measuring apparatus including a wiring switch and an insulation resistance meter, and more particularly to an insulation resistance measuring apparatus including a wiring switch and an insulation resistance meter. Field of the Invention The present invention relates to a wiring switcher and an insulation resistance measuring device that can easily perform work related to wiring changes between wirings.

When measuring the insulation resistance of parallel multi-circuit transmission lines (overhead or underground transmission lines), the mega ring filter reduces the induced voltage from other live lines and measures the insulation resistance safely. It is a filter means inserted between the transmission line and the insulation resistance meter for the measurement.

FIG. 8A is a schematic diagram showing the external configuration of a Mega ring filter, and FIG. 8B is a circuit diagram of the Mega ring filter.
As shown in FIG. 8A, the mega ring filter 100 includes an insulating rod 101, a hook-shaped overhead wire terminal 103 that protrudes from one end in the longitudinal direction of the insulating rod 101 and is locked to the line 150 to be measured, It has three terminals (a ground terminal 105, a ground-side lead wire 107E, and a line-side lead wire 107L) taken out from the other longitudinal end of the insulating rod.
The ground terminal 105 is composed of an alligator clip, ground hook, or the like, and is electrically connected to a grounded portion of steel or the like. The ground-side lead wire 107E is connected to the ground connection portion 201E of the insulation resistance meter 200, and the line-side lead wire 107L is connected to the line connection portion 201L of the insulation resistance meter 200. FIG.
As shown in FIG. 8B, the Mega ring filter 100 has a configuration in which resistors R1, R2, R3, and R are connected in series between the overhead wire terminal 103 and the line-side lead wire 107L. A capacitor C1 is provided between the node 111 between the resistors R1 and R2 and the ground terminal 105, a capacitor C2 is provided between the node 113 between the resistors R2 and R3 and the ground terminal 105, and a capacitor C2 is provided between the resistor R3 and the resistor. A capacitor C is connected between the node 115 with R and the ground terminal 105 . Also, the ground-side lead wire 107E is connected to the ground terminal 105 .
The combined resistance R1+R2+R3+R of the Mega ring filter 100 is, for example, 2 megohms.

9(a) and 9(b) are schematic diagrams showing a conventional method for measuring insulation resistance using a mega ring filter and an insulation resistance tester. FIG. 9(a) shows a method for measuring insulation resistance between grounds, and FIG. 9(b) shows a method for measuring insulation resistance between phases.

As shown in FIG. 9A, one Mega ring filter 100 is used to measure the insulation resistance between the line 150 to be measured and the ground. First, the line-side lead wire 107L and the ground-side lead wire 107E of the mega ring filter 100 are connected to the line connection portion 201L and the ground connection portion 201E of the insulation resistance meter 200 mounted on the insulating base 210, respectively. 105 is grounded. By locking the hook-shaped overhead wire terminal 103 to the line 150 to be measured, the overhead wire terminal 103 is electrically connected to the line 150 to be measured. Measure the resistance.
As shown in FIG. 9(b), two mega ring filters 100A and 100B are used to measure the insulation resistance between the two lines to be measured 150A and 150B. First, the ground lead wire 107E of one Mega ring filter 100A is connected to the ground connector 201E of the insulation resistance tester 200, and the ground lead wire 107E of the other Mega ring filter 100B is connected to the line connector 201L. The ground terminals 105, 105 of both Mega ring filters 100A, 100B are grounded. The line-side lead wires 107L, 107L of both Mega ring filters 100A, 100B are left open. Hook-shaped overhead wire terminals 103, 103 of both Mega ring filters 100A, 100B are engaged with the lines 150A, 150B to be measured, respectively, to electrically connect the overhead wire terminals 103, 103 to the lines 150A, 150B to be measured. Then, the insulation resistance is measured by applying a predetermined voltage from the insulation resistance meter 200 .
As described above, the number of mega ring filters used and the circuit configuration differ between when measuring the insulation resistance between the ground and when measuring the insulation resistance between the phases, and it is necessary to change the wiring. In addition, since the work involved handling high voltage, it was necessary to carry out the work carefully in order to prevent electric shock accidents.

Patent Literature 1 describes an insulation resistance measuring instrument used to measure the insulation resistance of transmission lines using a mega ring filter. This insulation resistance measuring instrument is arranged between a mega ring filter and an insulation resistance meter main body, and has a terminal section detachably connected to the insulation resistance meter main body. The terminal section has two body connection terminals connected to one end of the insulation resistance tester body. In addition, the terminal portion has two connection terminals connected to the terminals of the Mega ring filter at the other end and electrically connected to the main body connection terminals, and the terminals of the Mega ring filter are temporarily fixed to be in an open state. and two opening terminals for maintaining.

Japanese Patent Application Laid-Open No. 2012-237731

In the insulation resistance measuring instrument described in Patent Literature 1, wiring change is still required for measuring insulation resistance between grounds and for measuring insulation resistance between phases.
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to measure the insulation resistance between the ground and the insulation resistance between the phases without changing the wiring.

In order to solve the above problems, the present invention provides a plurality of mega ring filters each having a ground-side lead wire connected to a ground point and a line-side lead wire connected to an overhead wire via a resistor; A wiring switch inserted between an insulation resistance meter for measuring insulation resistance between an overhead wire and the ground or between two overhead wires, and connected to the ground side lead wire of each mega ring filter. a plurality of filter-side ground terminals connected to each of the megger ring filters, a plurality of filter-side line terminals connected to the line-side lead wires of the megger ring filters, and an insulation resistance meter-side ground connected to the ground connection portion of the insulation resistance meter a terminal, a line terminal on the insulation resistance meter side connected to the line connection portion of the insulation resistance meter, and a ground terminal on the insulation resistance meter side and the line terminal on the insulation resistance meter side, respectively. a connection selection switch for selectively conducting one of the terminals and the filter-side line terminals, wherein the connection selection switch is configured to connect the filter-side ground terminal to one of the mega ring filters. and the filter-side line terminal are electrically connected to the insulation resistance meter-side ground terminal and the insulation resistance meter-side line terminal, respectively, or the filter-side line terminal connected to one mega ring filter and the other It is characterized in that the filter-side line terminal connected to the megger ring filter is switched between conducting to the insulation resistance meter-side ground terminal and the insulation resistance meter-side line terminal, respectively.

According to the present invention, it is possible to measure the insulation resistance between the ground and the insulation resistance between the phases without changing the wiring.

1 is a schematic diagram showing an external configuration of a wiring switching device according to a first embodiment of the present invention; FIG. 1 is a circuit diagram of a wiring switch according to a first embodiment of the present invention; FIG. (a) to (d) are diagrams showing a conduction correlation table of the wiring switch. (a), (b) is a schematic diagram which shows the measuring method of insulation resistance using the wiring switch which concerns on one Embodiment of this invention. FIG. 5 is a schematic diagram showing the external configuration of a wiring switch according to a second embodiment of the present invention; FIG. 4 is a circuit diagram of a wiring switch according to a second embodiment of the present invention; (a) to (f) are diagrams showing conduction correlation tables of the wiring switch. (a) is a schematic diagram showing the external configuration of a Mega ring filter, and (b) is a circuit diagram of the Mega ring filter. (a) and (b) are schematic diagrams showing a conventional method for measuring insulation resistance using a mega ring filter and an insulation resistance meter.

The present invention will be described in detail below using embodiments shown in the drawings. However, unless there is a specific description, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention. .

[First embodiment]
<External configuration>
FIG. 1 is a schematic diagram showing the external configuration of a wiring switch according to the first embodiment of the present invention.
The wiring switcher 1 switches between a case 10 containing wirings, a filter-side terminal group 20 to which each lead wire of the mega ring filter is connected, and measurement of insulation resistance between ground and insulation resistance between phases. A ground/interphase selection switch 40, a mega ring filter selection switch (hereinafter referred to as MF selection switch 50) for switching a mega ring filter connected to an insulation resistance meter, and an insulation resistance meter side terminal 30 connected to the insulation resistance meter. Prepare.

The filter-side terminal group 20 includes a first filter-side terminal 21 connected to the first Mega ring filter 100A and a second filter-side terminal 22 connected to the second Mega ring filter 100B (FIG. 4B )reference). The first filter side terminal 21 includes a first filter side ground terminal 21E to which the ground side lead wire 107E of the first mega ring filter 100A is connected, and a first filter side ground terminal 21E to which the line side lead wire 107L of the first mega ring filter 100A is connected. and one filter side line terminal 21L. The second filter side terminal 22 includes a second filter side ground terminal 22E to which the ground side lead wire 107E of the second mega ring filter 100B is connected, and a second filter side ground terminal 22E to which the line side lead wire 107L of the second mega ring filter 100B is connected. and two filter-side line terminals 22L.

The ground/interphase selection switch 40 is a switch for switching between a ground connection that forms a circuit corresponding to insulation resistance measurement between the grounds and an interphase connection that forms a circuit corresponding to the insulation resistance measurement between the phases. ” and “phase-to-phase”. Note that the ground/interphase selection switch 40 may optionally have an "OFF" connection state.

The MF selection switch 50 is a switch for switching between the first mega ring filter and the second mega ring filter to be connected to the insulation resistance meter side ground terminal 30E and the insulation resistance meter side line terminal 30L. , has at least two connection states (“MF1” and “MF2” here). Note that the MF selection switch 50 may optionally further have an "OFF" connection state.

The insulation resistance meter side terminal 30 is connected to the insulation resistance meter side terminal 30E connected to the earth connection part 201E (see FIG. 4A) of the insulation resistance meter 200 and to the line connection part 201L of the insulation resistance meter 200. and an insulation resistance meter side line terminal 30L.

<Circuit configuration>
FIG. 2 is a circuit diagram of the wiring switch according to the first embodiment of the present invention.
In the following description, a small switch included in each selection switch is called a selector switch. In addition, the filter side terminal group 20 side will be described as one end side, and the insulation resistance meter side terminal 30 side will be described as the other end side.
The ground/interphase selection switch 40 and the MF selection switch 50 select the filter side ground terminals 21E and 22E and the filter side line terminals 21L and 22L as the insulation resistance meter side ground terminal 30E and the insulation resistance meter side line terminal 30L. It configures a connection selection switch that is electrically conductive. Both switches connect the filter-side ground terminal and the filter-side line terminal connected to one megger ring filter to the insulation resistance meter side ground terminal 30E and the insulation resistance meter side line terminal 30L, respectively, or connect one The filter-side line terminal connected to the mega ring filter and the filter-side line terminal connected to the other mega ring filter are switched between conducting to the insulation resistance meter side ground terminal 30E and the insulation resistance meter side line terminal 30L, respectively. .

<<Ground/interphase selection switch>>
The ground/phase selector switch 40 includes a first ground/phase selector switch 41 and a second ground/phase selector switch 42 .
The first ground/interphase switch 41 has an open terminal 41a at one end, a connection terminal 41E connected to the first filter side ground terminal 21E, and a connection terminal 41L connected to the second filter side line terminal 22L. . In addition, the first ground/interphase changeover switch 41 has a connection terminal 41b connected to the MF selection switch 50 at the other end. The first ground/interphase selector switch 41 is means for switching which of the open terminal 41a and the connection terminals 41E and 41L should be electrically connected to the connection terminal 41b.
The first ground/interphase switch 41 conducts the connection terminal 41E to the connection terminal 41b when "ground" is selected, and conducts the connection terminal 41L to the connection terminal 41b when "interphase" is selected. Further, the first ground/interphase changeover switch 41 conducts the open terminal 41a to the connection terminal 41b when "OFF" is selected.

The second ground/phase switch 42 has an open terminal 42a at one end, a connection terminal 42E connected to the second filter side ground terminal 22E, and a connection terminal 42L connected to the first filter side line terminal 21L. . The second ground/interphase switch 42 has a connection terminal 42b connected to the MF selection switch 50 at the other end. The second ground/interphase changeover switch 42 is means for switching which of the open terminal 42a and the connection terminals 42E and 42L should be electrically connected to the connection terminal 42b.
The second earth/phase selector switch 42 conducts the connection terminal 42E to the connection terminal 42b when "ground" is selected, and conducts the connection terminal 42L to the connection terminal 42b when "interphase" is selected. Further, the second ground/interphase selector switch 42 conducts the open terminal 42a to the connection terminal 42b when "OFF" is selected.

The ground/interphase selection switch 40 has a number of selector switches corresponding to the number of connectable mega ring filters. Since the wiring switch 1 shown in this example can connect two mega ring filters, the ground/interphase selection switch 40 includes two switches 41 and 42 .
The first ground/interphase selector switch 41 and the second ground/interphase selector switch 42 are arranged in parallel and interlocked. That is, when the first ground/phase selector switch 41 connects the connection terminal 41E to the connection terminal 41b, the second ground/phase selector switch 42 connects the connection terminal 42E to the connection terminal 42b. 41 connects the connection terminal 41L to the connection terminal 41b, the second ground/phase selector switch 42 connects the connection terminal 42L to the connection terminal 42b, and the first ground/phase selector switch 41 connects the open terminal 41a to the connection terminal 41b. , the second ground/interphase switch 42 connects the open terminal 42a to the connection terminal 42b.

<<MF selection switch>>
The MF selection switch 50 includes a first Mega ring filter changeover switch (hereinafter abbreviated as “first MF changeover switch”) 51 and a second Megaring filter changeover switch (hereinafter abbreviated as “second MF changeover switch”) 52 . Prepare.
One end of the first MF changeover switch 51 is connected to the ground/interphase selection switch 40, and the other end is connected to the insulation resistance meter side ground terminal 30E.
The first MF changeover switch 51 has an open terminal 51a at one end, a connection terminal 51c connected to the connection terminal 41b of the ground/phase selection switch 40, and a connection terminal connected to the connection terminal 42b of the ground/phase selection switch 40. 51d. The first MF changeover switch 51 has a connection terminal 51b connected to the insulation resistance meter side ground terminal 30E at the other end. The first MF changeover switch 51 is means for switching which of the open terminal 51a and the connection terminals 51c and 51d should be electrically connected to the connection terminal 51b.
The first MF changeover switch 51 conducts the connection terminal 51c to the connection terminal 51b when "MF1" is selected, and conducts the connection terminal 51d to the connection terminal 51b when "MF2" is selected. Further, the first MF changeover switch 51 conducts the open terminal 51a to the connection terminal 51b when "OFF" is selected.

One end of the second MF selector switch 52 is connected to the first filter side line terminal 21L and the second filter side line terminal 22L, and the other end is connected to the insulation resistance meter side line terminal 30L.
The second MF changeover switch 52 has an open terminal 52a at one end, a connection terminal 52c connected to the first filter side line terminal 21L, and a connection terminal 52d connected to the second filter side line terminal 22L. The second MF changeover switch 52 has a connection terminal 52b connected to the insulation resistance meter side line terminal 30L at the other end. The second MF changeover switch 52 is means for switching which of the open terminal 52a and the connection terminals 52c and 52d should be electrically connected to the connection terminal 52b.
The second MF changeover switch 52 conducts the connection terminal 52c to the connection terminal 52b when "MF1" is selected, and conducts the connection terminal 52d to the connection terminal 52b when "MF2" is selected. Further, the second MF changeover switch 52 conducts the open terminal 52a to the connection terminal 52b when "OFF" is selected.

Each changeover switch 51, 52 constituting the MF selection switch 50 has, at one end thereof, a number of connection terminals corresponding to the number of mega ring filters to which the wiring switch 1 can be connected. Since the wiring switch 1 shown in this example can connect two mega ring filters, each switch 51, 52 has at least two connection terminals (51c to 51d, 52c to 52d) at one end. One end of each changeover switch 51, 52 shown in this example is provided with a total of three terminals including open terminals (51a, 52a).
The first MF changeover switch 51 and the second MF changeover switch 52 are arranged in parallel and interlocked. That is, when the first MF changeover switch 51 connects the connection terminal 51c to the connection terminal 51b, the second MF changeover switch 52 connects the connection terminal 52c to the connection terminal 52b, and the first MF changeover switch 51 connects the connection terminal 51d. The second MF changeover switch 52 connects the connection terminal 52d to the connection terminal 52b when connecting to the connection terminal 51b, and the second MF changeover switch 51 connects the open terminal 51a to the connection terminal 51b. 52 connects the open terminal 52a to the connection terminal 52b.

<Relationship between ground/interphase selection switch and MF selection switch>
Hereinafter, the "type of terminal" will be described as either "earth" or "line".
When "to ground" is selected, the ground/phase selection switch 40 has a terminal (filter side ground terminal 21</b>E or 22</b>E) to the first MF selector switch 51 . In addition, when "between phases" is selected, the ground/phase selection switch 40 is connected to one end of the second MF changeover switch 52 (filter side line terminals 21L, 22L) and terminals of the same type ( The filter-side line terminal 21 L or 22 L) is configured to be electrically connected to the first MF changeover switch 51 .
With this configuration, the MF selection switch 50 selects either the first filter side terminal 21 or the second filter side terminal 22 when the ground/interphase selection switch 40 selects "ground". It can be made conductive to the side terminal 30 . Further, the MF selection switch 50 connects the first filter side line terminal 21L and the second filter side line terminal 22L to the insulation resistance meter side terminal 30 when the ground/phase selection switch 40 selects "interphase". can be done.

A filter-side ground terminal and a filter-side line terminal are connected to one end of each of the ground/phase changeover switches 41 and 42, but one ground/phase changeover switch is connected to a different mega ring filter. The filter-side ground terminal and the filter-side line terminal are connected.
That is, for example, connection terminals 41E and 41L provided at one end of the first ground/interphase selector switch 41 are connected to the filter-side ground terminal 21E and the filter-side line terminal 21L, respectively. The filter side ground terminal 21E is connected to the ground side lead wire of the first mega ring filter, and the filter side line terminal 21L is connected to the line side lead wire of the second mega ring filter. Description of the second ground/interphase selector switch 42 is omitted.
With this configuration, the first MF selector switch 51 and the second MF selector switch 52 that constitute the MF selection switch 50 can be interlocked. In other words, regardless of whether "to ground" or "between phases" is selected by the ground/phase selection switch 40, it is possible to measure the insulation resistance to ground without changing the interlocking operation inside the MF selection switch 50. and a circuit corresponding to insulation resistance measurement between phases can be formed.

<Action>
FIGS. 3(a) to 3(d) are diagrams showing conduction correlation tables of the wiring switch.
FIG. 3(a) shows the electrical connection relationship when the ground/interphase selection switch 40 selects "ground" and the MF selection switch 50 selects "MF1".
In this case, the first filter side ground terminal 21E is electrically connected to the insulation resistance meter side ground terminal 30E, and the first filter side line terminal 21L is electrically connected to the insulation resistance meter side line terminal 30L. That is, it is possible to measure the insulation resistance to ground using the mega ring filter connected to the first filter side terminal 21 .

FIG. 3(b) shows the electrical connection relationship when the ground/interphase selection switch 40 selects "ground" and the MF selection switch 50 selects "MF2".
In this case, the second filter side ground terminal 22E is electrically connected to the insulation resistance meter side ground terminal 30E, and the second filter side line terminal 22L is electrically connected to the insulation resistance meter side line terminal 30L. That is, it is possible to measure the insulation resistance to ground using the mega ring filter connected to the second filter side terminal 22 .

FIG. 3(c) shows the electrical connection relationship when the ground/interphase selection switch 40 selects "interphase" and the MF selection switch 50 selects "MF1".
In this case, the second filter side line terminal 22L is electrically connected to the insulation resistance meter side ground terminal 30E, and the first filter side line terminal 21L is electrically connected to the insulation resistance meter side line terminal 30L. That is, interphase insulation resistance can be measured with the Mega ring filter connected to the first filter side line terminal 21L as the high voltage side and the Mega ring filter connected to the second filter side line terminal 22L as the low voltage side.

FIG. 3(c) shows the electrical connection relationship when the ground/interphase selection switch 40 selects "interphase" and the MF selection switch 50 selects "MF2".
In this case, the first filter side line terminal 21L is electrically connected to the insulation resistance meter side ground terminal 30E, and the second filter side line terminal 22L is electrically connected to the insulation resistance meter side line terminal 30L. That is, interphase insulation resistance can be measured with the Mega ring filter connected to the second filter side line terminal 22L as the high voltage side and the Mega ring filter connected to the first filter side line terminal 21L as the low voltage side.

As shown in FIGS. 3(a) and 3(b), the MF selection switch 50 when measuring insulation resistance to ground functions as a switch for selecting a mega ring filter used for measurement to ground.
As shown in FIGS. 3(c) and 3(d), the MF selection switch 50 when measuring interphase insulation resistance functions as a switch for selecting a mega ring filter to which voltage is applied.

<How to use>
4A and 4B are schematic diagrams showing a method of measuring insulation resistance using a wiring switch according to one embodiment of the present invention. FIG. 4(a) shows a method for measuring insulation resistance between grounds, and FIG. 4(b) shows a method for measuring insulation resistance between phases.

<<Wiring>>
As shown in FIG. 4(a), one mega ring filter 100A is used to measure the insulation resistance between the line (wire) 150A to be measured and the ground. However, the wiring of the other Mega ring filter 100B is also completed in advance before the insulation resistance to ground is measured.
That is, first, it is confirmed that the ground/interphase selection switch 40 and the MF selection switch 50 of the wiring switch 1 are both "OFF", and the insulation resistance meter side ground terminal 30E of the wiring switch 1 and the insulation resistance The meter-side line terminal 30L is connected to the ground connection portion 201E and the line connection portion 201L of the insulation resistance meter 200 placed on the insulating base 210 by lead wires or the like.
Subsequently, the line-side lead wire 107L and the ground-side lead wire 107E of the mega ring filter 100A are connected to the first filter-side ground terminal 21E and the first filter-side line terminal 21L of the wiring switch 1, respectively. Similarly, the line-side lead wire 107L and the ground-side lead wire 107E of the mega ring filter 100B are connected to the second filter-side ground terminal 22E and the second filter-side line terminal 22L of the wiring switch 1, respectively. The ground terminals 105, 105 of both Mega ring filters 100A, 100B are grounded.

<<Measurement between ground>>
By locking the overhead wire terminal 103 of the first Mega ring filter 100A to the measurement object line 150A, the overhead wire terminal 103 is electrically connected to the measurement object line 150A. The ground/interphase selection switch 40 of the wiring switch 1 is set to "ground", and the MF selection switch 50 is set to "MF1". The insulation resistance to ground is measured by applying a predetermined voltage from the insulation resistance meter 200 .
Repeat the following steps when continuing to measure the ground insulation resistance of other phases (other lines to be measured). That is, the ground/interphase selection switch 40 and the MF selection switch 50 of the wiring switch 1 are set to "OFF". The overhead wire terminal 103 of the first megger ring filter 100A is locked to another line to be measured, and the ground/phase selection switch 40 of the wiring switch 1 is set to "ground", and the MF selection switch 50 is set to "MF1". Then, the insulation resistance to ground is measured by applying a predetermined voltage from the insulation resistance meter 200 .

<<Interphase measurement>>
As shown in FIG. 4(b), when measuring the insulation resistance between two measurement target lines (overhead wires) 150A and 150B, two mega ring filters 100A and 100B are used, but there is no need to change the wiring. .
That is, first, it is confirmed that both the ground/interphase selection switch 40 and the MF selection switch 50 of the wiring switch 1 are "OFF". By locking the overhead wire terminal 103 of the first Mega ring filter 100A to the line to be measured 150A and locking the overhead wire terminal 103 of the second Mega ring filter 100B to the line to be measured 150B, both overhead wire terminals 103, 103 are electrically connected to lines to be measured 150A and 150B, respectively. The ground/interphase selection switch 40 of the wiring switch 1 is set to "interphase", and the MF selection switch 50 is set to "MF1" or "MF2". By applying a predetermined voltage from the insulation resistance meter 200, the insulation resistance between the lines 150A and 150B to be measured is measured.

Repeat the following steps when measuring insulation resistance between different phases (between different lines to be measured). That is, the ground/interphase selection switch 40 and the MF selection switch 50 of the wiring switch 1 are set to "OFF". The overhead wire terminal 103 of the second megger ring filter 100B is locked to another line to be measured, and the ground/phase selection switch 40 of the wiring switch 1 is set to "interphase", and the MF selection switch 50 is set to "MF1" or " MF2” and apply a predetermined voltage from the insulation resistance meter 200 to measure the insulation resistance between phases.

<effect>
As described above, according to the present embodiment, since it is not necessary to change the wiring when measuring the insulation resistance between the ground and when measuring the insulation resistance between the phases, the safety of the work is improved and the work time is shortened. be able to.
In this embodiment, the wiring switch and the insulation resistance meter are configured separately, but they may be integrated to form an insulation resistance measuring device.

[Second embodiment]
<External configuration>
FIG. 5 is a schematic diagram showing the external configuration of the wiring switch according to the second embodiment of the present invention. The wiring switch according to this embodiment is characterized in that three mega ring filters can be wired at once. Hereinafter, members similar to those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

The wiring switcher 2 includes, as the filter side terminal group 20, a third filter side terminal 23 connected to the third mega ring filter. The third filter side terminal 23 includes a third filter side ground terminal 23E and a third filter side line terminal 23L.
The MF selection switch 50 has at least three connection states of "MF1", "MF2" and "MF3". Also in this example, the MF selection switch 50 may optionally further have an "OFF" connection state.

<Circuit configuration>
FIG. 6 is a circuit diagram of a wiring switch according to a second embodiment of the invention.

<<Ground/interphase selection switch>>
The ground/phase selector switch 40 includes a first ground/phase selector switch 41 , a second ground/phase selector switch 42 , and a third ground/phase selector switch 43 .
Since the configuration of the first ground/interphase selector switch 41 is the same as that of the first embodiment, detailed description thereof will be omitted.
The first ground/interphase switch 41 conducts the connection terminal 41E to the connection terminal 41b when "ground" is selected, and conducts the connection terminal 41L to the connection terminal 41b when "interphase" is selected. Further, the first ground/interphase changeover switch 41 conducts the open terminal 41a to the connection terminal 41b when "OFF" is selected.

The configuration differs from that of the first embodiment in that the third filter side line terminal 23L is connected to the connection terminal 42L of the second ground/interphase selector switch 42 .
The second earth/phase selector switch 42 conducts the connection terminal 42E to the connection terminal 42b when "ground" is selected, and conducts the connection terminal 42L to the connection terminal 42b when "interphase" is selected. Further, the second ground/interphase selector switch 42 conducts the open terminal 42a to the connection terminal 42b when "OFF" is selected.

The third ground/phase switch 43 has an open terminal 43a at one end, a connection terminal 43E connected to the third filter side ground terminal 23E, and a connection terminal 43L connected to the first filter side line terminal 21L. . Further, the third ground/interphase changeover switch 43 has a connection terminal 43b connected to the MF selection switch 50 at the other end. The third ground/interphase changeover switch 43 is means for switching which of the open terminal 43a and the connection terminals 43E and 43L should be electrically connected to the connection terminal 43b.
The third ground/interphase selector switch 43 electrically connects the connection terminal 43E to the connection terminal 43b when "ground" is selected, and electrically connects the connection terminal 43L to the connection terminal 43b when "interphase" is selected. Further, the third ground/interphase selector switch 43 conducts the open terminal 43a to the connection terminal 43b when "OFF" is selected.

The ground/interphase selection switch 40 has a number of selector switches corresponding to the number of connectable mega ring filters. Since the wiring switch 2 shown in this example can be connected to three mega ring filters, the ground/interphase selection switch 40 has three switches 41 to 43 .
The first ground/phase switch 41 to the third ground/phase switch 43 are arranged in parallel and interlocked. That is, when the first ground/phase changeover switch 41 connects the connection terminal 41E to the connection terminal 41b, the second ground/phase changeover switch 42 connects the connection terminal 42E to the connection terminal 42b, and the third ground/phase changeover switch 41 connects the connection terminal 41E to the connection terminal 41b. The switch 43 connects the connection terminal 43E to the connection terminal 43b. When the first ground/phase changeover switch 41 connects the connection terminal 41L to the connection terminal 41b, the second ground/phase changeover switch 42 connects the connection terminal 42L to the connection terminal 42b, and the third ground/phase changeover switch 43 connects the connection terminal 42L to the connection terminal 42b. connects the connection terminal 43L to the connection terminal 43b. When the first ground/phase switch 41 connects the open terminal 41a to the connection terminal 41b, the second ground/phase switch 42 connects the open terminal 42a to the connection terminal 42b, and the third ground/phase switch 43 connects the open terminal 42a to the connection terminal 42b. connects the open terminal 43a to the connection terminal 43b.

<<MF selection switch>>
The MF selection switch 50 includes a first MF selector switch 51 and a second MF selector switch 52 .
One end of the first MF changeover switch 51 is connected to the ground/interphase selection switch 40, and the other end is connected to the insulation resistance meter side ground terminal 30E.
The first MF changeover switch 51 has, in addition to the configuration of the first embodiment, a connection terminal 51e connected to the connection terminal 43b of the ground/interphase selection switch 40 at one end. The first MF changeover switch 51 is means for switching which of the open terminal 51a and the connection terminals 51c to 51e should be electrically connected to the connection terminal 51b.
The first MF selector switch 51 connects the connection terminal 51c to the connection terminal 51b when "MF1" is selected, connects the connection terminal 51d to the connection terminal 51b when "MF2" is selected, and connects the connection terminal 51d to the connection terminal 51b when "MF3" is selected. is selected, the connection terminal 51e is electrically connected to the connection terminal 51b. Further, the first MF changeover switch 51 conducts the open terminal 51a to the connection terminal 51b when "OFF" is selected.

One end of the second MF selector switch 52 is connected to the first to third filter side line terminals 21L to 23L, and the other end is connected to the insulation resistance meter side line terminal 30L.
In addition to the configuration of the first embodiment, the second MF changeover switch 52 has, at one end thereof, a connection terminal 52e connected to the third filter side line terminal 23L. The second MF changeover switch 52 is means for switching which of the open terminal 52a and the connection terminals 52c to 52e should be electrically connected to the connection terminal 52b.
The second MF selector switch 52 connects the connection terminal 52c to the connection terminal 52b when "MF1" is selected, connects the connection terminal 52d to the connection terminal 52b when "MF2" is selected, and connects the connection terminal 52d to "MF3". is selected, the connection terminal 52e is electrically connected to the connection terminal 52b. Further, the second MF changeover switch 52 conducts the open terminal 52a to the connection terminal 52b when "OFF" is selected.

Each of the changeover switches 51 and 52 constituting the MF selection switch 50 has, at one end thereof, a number of connection terminals corresponding to the number of Mega ring filters to which the wiring switcher 2 can be connected. Since the wiring switch 2 shown in this example can be connected to three mega ring filters, each switch 51 to 53 has at least three connection terminals (51c to 51e, 52c to 52e, 53c to 53e) at one end. . A total of four terminals including open terminals (51a, 52a, 53a) are provided at one end of each of the changeover switches 51 to 53 shown in this example.
The first MF changeover switch 51 and the second MF changeover switch 52 are interlocked. That is, when the first MF changeover switch 51 connects the connection terminal 51c to the connection terminal 51b, the second MF changeover switch 52 connects the connection terminal 52c to the connection terminal 52b. When the first MF changeover switch 51 connects the connection terminal 51d to the connection terminal 51b, the second MF changeover switch 52 connects the connection terminal 52d to the connection terminal 52b. When the first MF changeover switch 51 connects the connection terminal 51e to the connection terminal 51b, the second MF changeover switch 52 connects the connection terminal 52e to the connection terminal 52b. When the first MF changeover switch 51 connects the open terminal 51a to the connection terminal 51b, the second MF changeover switch 52 connects the open terminal 52a to the connection terminal 52b.
Since the relationship between the ground/interphase selection switch and the MF selection switch is the same as in the first embodiment, the description thereof will be omitted.

<Action>
FIGS. 7(a) to 7(f) are diagrams showing conduction correlation tables of the wiring switch.
FIG. 7(a) shows the electrical connections when the ground/interphase selection switch 40 selects "ground" and the MF selection switch 50 selects "MF1".
In this case, the first filter side ground terminal 21E is electrically connected to the insulation resistance meter side ground terminal 30E, and the first filter side line terminal 21L is electrically connected to the insulation resistance meter side line terminal 30L. That is, it is possible to measure the insulation resistance to ground using the mega ring filter connected to the first filter side terminal 21 .

FIG. 7B shows the electrical connection relationship when the ground/interphase selection switch 40 selects "ground" and the MF selection switch 50 selects "MF2".
In this case, the second filter side ground terminal 22E is electrically connected to the insulation resistance meter side ground terminal 30E, and the second filter side line terminal 22L is electrically connected to the insulation resistance meter side line terminal 30L. That is, it is possible to measure the insulation resistance to ground using the mega ring filter connected to the second filter side terminal 22 .

FIG. 7(c) shows the electrical connection relationship when the ground/interphase selection switch 40 selects "ground" and the MF selection switch 50 selects "MF3".
In this case, the third filter side ground terminal 23E is electrically connected to the insulation resistance meter side ground terminal 30E, and the third filter side line terminal 23L is electrically connected to the insulation resistance meter side line terminal 30L. That is, it is possible to measure the insulation resistance to ground using the mega ring filter connected to the third filter side terminal 23 .

FIG. 7(d) shows the electrical connection relationship when the ground/interphase selection switch 40 selects "interphase" and the MF selection switch 50 selects "MF1".
In this case, the second filter side line terminal 22L is electrically connected to the insulation resistance meter side ground terminal 30E, and the first filter side line terminal 21L is electrically connected to the insulation resistance meter side line terminal 30L. That is, interphase insulation resistance can be measured with the Mega ring filter connected to the first filter side line terminal 21L as the high voltage side and the Mega ring filter connected to the second filter side line terminal 22L as the low voltage side.

FIG. 7(e) shows the electrical connection relationship when the ground/interphase selection switch 40 selects "interphase" and the MF selection switch 50 selects "MF2".
In this case, the third filter side line terminal 23L is electrically connected to the insulation resistance meter side ground terminal 30E, and the second filter side line terminal 22L is electrically connected to the insulation resistance meter side line terminal 30L. That is, interphase insulation resistance can be measured with the Mega ring filter connected to the second filter side line terminal 22L as the high voltage side and the Mega ring filter connected to the third filter side line terminal 23L as the low voltage side.

FIG. 7(f) shows the electrical connection relationship when the ground/interphase selection switch 40 selects "interphase" and the MF selection switch 50 selects "MF3".
In this case, the first filter side line terminal 21L is electrically connected to the insulation resistance meter side ground terminal 30E, and the third filter side line terminal 23L is electrically connected to the insulation resistance meter side line terminal 30L. That is, interphase insulation resistance can be measured with the Mega ring filter connected to the third filter side line terminal 23L as the high voltage side and the Mega ring filter connected to the first filter side line terminal 21L as the low voltage side.

As shown in FIGS. 7A to 7C, the MF selection switch 50 when measuring insulation resistance to ground functions as a switch for selecting a mega ring filter used for measurement to ground.
As shown in FIGS. 7(d) to 7(f), the MF selection switch 50 when measuring interphase insulation resistance functions as a switch for selecting a mega ring filter to which voltage is applied.

<How to use and effect>
Since the method of use is the same as that of the first embodiment, the explanation thereof is omitted.
As described above, according to the present embodiment, since it is not necessary to change the wiring when measuring the insulation resistance between the ground and when measuring the insulation resistance between the phases, the safety of the work is improved and the work time is shortened. be able to.
In this embodiment, the wiring switch and the insulation resistance meter are configured separately, but they may be integrated to form an insulation resistance measuring device.

[Modified embodiment]
In the above embodiments, the connection terminals 52c and 52d (52d) provided at one end of the second MF changeover switch 52 are connected to the filter side line terminals 21L and 22L (23L).
However, one end of the second MF changeover switch 52 may be configured to connect the filter-side ground terminals 21E, 22E (and 23E). In this case, the connection terminal 52b provided at the other end of the second MF selector switch 52 is connected to the ground terminal 30E on the insulation resistance tester side, and the connection terminal 52b provided at the other end of the first MF selector switch 51 is connected to the ground terminal 30E. to connect the insulation resistance meter side line terminal 30L. Furthermore, the ground/interphase selection switch 40 has a terminal of a type different from the terminal (filter-side ground terminals 21E, 22E (and 23E)) connected to one end of the second MF selector switch when the ground connection is selected. (Filter-side line terminals 21L, 22L (, 23L)) are made conductive to the first MF selector switch 51, and when phase-to-phase connection is selected, terminals of the same type as those connected to one end of the second MF selector switch 52 (filter side ground terminals 21E, 22E (, 23E)) are configured to be electrically connected to the first MF changeover switch 51 .

[Summary of embodiment examples and actions and effects of the present invention]
<First Embodiment>
This embodiment includes a ground-side lead wire 107E connected to a ground point, and a line-side lead wire 107L connected to overhead wires (lines to be measured 150, 150A, 150B) via resistors R1 to R3, R. With wiring switches 1 and 2 inserted between a plurality of mega ring filters 100 (100A, 100B) and an insulation resistance meter 200 that measures the insulation resistance between an overhead wire and the ground or between two overhead wires be.
One end of the wiring switch has a plurality of filter-side ground terminals 21E to 23E connected to the ground-side lead wires of each mega ring filter and a plurality of filter-side ground terminals 21E to 23E connected to the line-side lead wires of each mega ring filter. and line terminals 21L to 23L.
The wiring switch has, on the other end side, an insulation resistance meter side ground terminal 30E connected to the insulation resistance meter's earth connection portion 201E, and an insulation resistance meter side line terminal 30L connected to the insulation resistance meter's line connection portion 201L. And prepare.
The wiring selector selectively connects one of the filter-side ground terminals and the filter-side line terminals to the insulation resistance meter side ground terminal and the insulation resistance meter side line terminal, respectively. A switch (ground/interphase selection switch 40 and MF selection switch 50) is provided. The connection selection switch connects the filter side ground terminal and the filter side line terminal connected to one mega ring filter to the insulation resistance meter side ground terminal and the insulation resistance meter side line terminal, respectively, or connects the one mega ring filter to the insulation resistance meter side ground terminal and the insulation resistance meter side line terminal. The filter-side line terminal connected to the filter and the filter-side line terminal connected to the other mega ring filter are switched between conducting to the insulation resistance meter side ground terminal and the insulation resistance meter side line terminal, respectively. do.

According to this aspect, it is possible to perform the insulation resistance measurement between the ground and the insulation resistance measurement between the phases without changing the wiring.
That is, when measuring the insulation resistance to ground, the filter-side ground terminal and the filter-side line terminal connected to the same megger ring filter are connected to the insulation resistance meter side ground terminal and the insulation resistance meter side line terminal, respectively. Let When measuring insulation resistance between phases, connect the filter side line terminal connected to one mega ring filter to the insulation resistance tester side ground terminal, and connect the filter side line terminal connected to the other mega ring filter. Connect to the line terminal on the insulation resistance meter side.
In this way, by switching the connection selection switch, it is possible to measure the insulation resistance between the ground and the insulation resistance between the phases without changing the wiring.

<Second embodiment>
In the wiring switches 1 and 2 according to this aspect, the connection selection switch includes a ground/interphase selection switch 40 and a mega ring filter selection switch 50 .
The connection terminals 41E to 43E and 41L to 43L provided at one end of the ground/phase selection switch are connected to the filter side ground terminals 21E to 23E and the filter side line terminals 21L to 23L, respectively. It is a switch that switches between
The megger ring filter selection switch has connection terminals 51b and 52b provided at the other end connected to the insulation resistance meter side ground terminal 30E and the insulation resistance meter side line terminal 30L, respectively. is a switch for switching whether the mega ring filter 100 is connected.

In this aspect, the ground/interphase selection switch is a switch that selectively switches between measuring the insulation resistance between the ground and the insulation resistance between the phases. On the other hand, the Mega ring filter selection switch is a switch for selectively switching which Mega ring filter to use when measuring insulation resistance between grounds or between phases.
According to this aspect, by appropriately switching between the ground/phase selection switch and the mega ring filter selection switch, a desired mega ring filter can be used to measure the insulation resistance between the ground and between the phases without changing the wiring. Insulation resistance measurements can be performed.

<Third embodiment>
In the wiring switches 1 and 2 according to this aspect, the mega ring filter selection switch 50 includes a first mega ring filter changeover switch 51 and a second mega ring filter changeover switch 52 .
The first megger ring filter changeover switch 51 has connection terminals 51c to 51e provided at one end connected to the ground/phase selection switch 40, and a connection terminal 51b provided at the other end connected to the insulation resistance meter side ground terminal 30E (or an insulating It is connected to the ohmmeter side line terminal 30L).
Connection terminals 52c to 52e provided at one end of the second mega ring filter changeover switch 52 are connected to the filter side line terminals 21L to 23L (or the filter side ground terminals 21E to 23E), and the other end is connected to the connection terminals 52c to 52e. The terminal 52b is connected to the insulation resistance meter side line terminal 30L (or insulation resistance meter side ground terminal 30E).
The ground/phase selection switch conducts a terminal of a type different from the type terminal connected to one end of the second mega ring filter changeover switch to the first mega ring filter changeover switch when the ground connection is selected, and the phase connection is performed. is selected, the terminal of the same type as the terminal of the type connected to one end of the second mega ring filter changeover switch is connected to the first mega ring filter changeover switch.

That is, when the filter-side line terminals 21L to 23L are connected to one end of the second mega ring filter changeover switch 52, the ground/interphase selection switch 40 switches to the second mega ring filter when ground connection is selected. The filter-side ground terminals 21E to 23E, which are terminals of a type different from the terminal connected to one end of the changeover switch 52, are connected to the first mega ring filter changeover switch 51. FIG. Under the same conditions as above, the ground/interphase selection switch 40 has the same type of terminal as the terminal connected to one end of the second mega ring filter changeover switch 52 when the interphase connection is selected. The filter-side line terminals 21L to 23L, which are terminals, are connected to the first mega ring filter changeover switch 51 .

According to this aspect, when the ground connection is selected by the ground/phase selection switch, the ground-side lead wire and the line-side lead wire of one mega ring filter can be electrically connected to the insulation resistance meter, and the phase-to-phase connection can be performed. is selected, the earth-side lead wire and the line-side lead wire of different mega ring filters can be connected to the insulation resistance meter.

By configuring the first and second mega ring filter selector switches to operate in conjunction with each other, both switches can be switched by a single operation, and connection errors can be prevented.

<Fourth Embodiment>
In the wiring switches 1 and 2 according to this aspect, the ground/phase selection switch 40 includes a plurality of ground/phase selection switches 41 to 43 arranged in parallel and interlocked with each other. One end of each ground/phase switch is electrically connected to a filter-side ground terminal and a filter-side line terminal that connect different mega ring filters.

That is, for example, the first ground/phase switch 41 has a connection terminal 41E and a connection terminal 41L at one end thereof, the connection terminal 41E being electrically connected to the filter side ground terminal 21E, and the connection terminal 41L being connected to the filter side line. It is conducting to the terminal 22L. In this manner, the connection terminals 41E and 41L are configured as terminals that connect to different mega ring filters.
By adopting the above configuration, each ground/interphase selector switch conducts a different mega ring filter to the mega ring filter selection switch 50 depending on whether the ground connection is selected or the interphase connection is selected. Therefore, even when the first and second mega ring filter changeover switches 51 and 52 are configured to interlock, the insulation resistance between the ground and the insulation resistance between the phases can be measured. It is possible to change the wiring in

<Fifth embodiment>
An insulation resistance measuring apparatus according to this aspect is characterized by comprising the wiring switches 1 and 2 described in any one of the first to fourth aspects, and an insulation resistance meter 200 .
This aspect has the same effect as the first to fourth aspects.

DESCRIPTION OF SYMBOLS 1, 2... Wiring switch 10... Case 20... Filter side terminal group 21... First filter side terminal 21E... First filter side earth terminal 21L... First filter side line terminal 22... Second filter side terminal 22E second filter side ground terminal 22L second filter side line terminal 23 third filter side terminal 23E third filter side ground terminal 23L third filter side line terminal 30 insulation Ohmmeter side terminal 30E... Insulation resistance meter side earth terminal 30L... Insulation resistance meter side line terminal 40... Ground/phase selection switch 41... First ground/phase switching switch 41a... Open terminal 41b, 41E, 41L... connection terminal, 42... second ground/phase selector switch, 42a... open terminal, 42b, 42E, 42L... connection terminal, 43... third ground/phase selector switch, 43a... open terminal, 43b, 43E, 43L... Connection terminals 50... Mega ring filter selection switch (MF selection switch) 51... First ring filter selector switch (first MF selector switch) 51a... Open terminal 51b to 51e... Connection terminal 52... Second gear Ring filter changeover switch (second MF changeover switch), 52a... Open terminal, 52b to 52e... Connection terminal, 100... Mega ring filter, 100A... (first) Mega ring filter, 100B... (second) Mega ring filter, DESCRIPTION OF SYMBOLS 101... Insulating rod 103... Overhead wire terminal 105... Grounding terminal 107E... Earth side lead wire 107L... Line side lead wire 111-115... Node 150, 150A, 150B... Line to be measured (overhead wire), 200... Insulation resistance tester, 201E... Earth connection part, 201L... Line connection part, 210... Insulation base

Claims (5)

A plurality of mega-ring filters each having a ground-side lead wire connected to a ground point and a line-side lead wire connected to an overhead wire via a resistor, and between the overhead wire and the ground or between two overhead wires. A wiring switch inserted between an insulation resistance meter that measures the insulation resistance in
a plurality of filter-side ground terminals connected to the ground-side lead wires of the respective mega ring filters;
a plurality of filter-side line terminals connected to the line-side lead wires of the respective mega ring filters;
an insulation resistance meter-side earth terminal connected to the earth connection portion of the insulation resistance meter;
an insulation resistance meter-side line terminal connected to the line connection portion of the insulation resistance meter;
Connection selection for selectively conducting one of the filter-side ground terminals and the filter-side line terminals with respect to the insulation resistance meter side ground terminal and the insulation resistance meter side line terminal, respectively. a switch;
The connection selection switch connects the filter-side ground terminal and the filter-side line terminal connected to one of the mega ring filters to the insulation resistance meter-side ground terminal and the insulation resistance meter-side line terminal, respectively; Alternatively, the filter-side line terminal connected to one of the Mega-ring filters and the filter-side line terminal connected to the other Mega-ring filter may be connected to the insulation-resistance-meter-side ground terminal and the insulation-resistance-meter-side line, respectively. A wire switching device characterized by switching between conducting and conducting to a terminal. The connection selection switch has one end connected to each of the filter-side ground terminals and each of the filter-side line terminals to switch between ground connection and phase-to-phase connection, and the other end to the insulation resistance tester side ground. 2. A mega ring filter selection switch connected to the terminal and the line terminal on the insulation resistance meter side for switching which mega ring filter to be connected to the insulation resistance meter. The wiring switcher described in . The megger ring filter selection switch has one end connected to the ground/interphase selection switch and the other end connected to the ground terminal on the insulation resistance meter side or the line terminal on the insulation resistance meter side. and a second megger ring filter switch having one end connected to each of the filter side line terminals or each of the filter side ground terminals and the other end connected to the insulation resistance meter side line terminal or the insulation resistance meter side ground terminal a switch;
The ground/interphase selection switch conducts a terminal of a type different from a terminal connected to one end of the second mega ring filter changeover switch to the first mega ring filter changeover switch when the ground connection is selected. and, when the phase-to-phase connection is selected, a terminal of the same type as that connected to one end of the second mega ring filter changeover switch is electrically connected to the first mega ring filter changeover switch. The wiring switching device according to claim 2. The ground/phase selector switch includes a plurality of ground/phase selector switches arranged in parallel and interlocking with each other,
4. The wiring according to claim 2, wherein one end of each of the ground/interphase selector switches is electrically connected to the filter-side ground terminal and the filter-side line terminal that connect different mega ring filters. switcher. An insulation resistance measuring device comprising: the wiring switch according to any one of claims 1 to 4; and the insulation resistance meter.

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