JP3286462B2 - High-voltage equipment uninterruptible switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage equipment uninterruptible switching apparatus for replacing high-voltage equipment such as voltage transformers and measuring instruments for measuring instruments without interruption or performing periodic inspections.

[0002]

2. Description of the Related Art Hitherto, as this type of high-voltage equipment uninterruptible switching device, for example, a configuration as disclosed in Japanese Utility Model Laid-Open No. 2-142944 is known. That is, as shown in FIG.
Is provided with an instrument transformer 91 and a power meter 92. The electric energy meter 92 measures the amount of electric power used to be supplied to the consumer via the main line 90. Here, when replacing the transformer for measuring instrument 91, the electric power meter 92, or the like due to the service life or the like, the high-voltage equipment uninterruptible switching device 93 is connected to the main line 90 to be constructed via the bypass cable 98. Is done. By this connection, a bypass circuit 94 is formed. The high-voltage equipment uninterruptible switching device 93 is provided with an instrument transformer / current transformer 95. The instrument current transformer 95 includes a transformer 95a and a current transformer 95b, and the transformer 95a is connected to each phase of the bypass circuit 94. An interface section 96 is provided for the
The power meter 97 can be connected via the. Then, when replacing the transformer / current transformer 91 for the instrument or the electric power meter 92 to be constructed, a bypass circuit 94 is formed in the main line 90 of the construction section, and the replacement is performed without interruption. In addition, during the replacement work, the amount of electric power used to be supplied from the bypass circuit 94 to the customer is changed to the high-voltage equipment uninterruptible switching device 93.
Is continuously measured by the electric energy meter 97 of FIG.

[0003]

According to the high-voltage equipment uninterruptible switching device, the operator can operate the high-voltage equipment uninterruptible switching device 93.
After connecting the bypass cable 98 to the main line 90 of each phase, the end of the bypass cable 98 is connected to the trunk line 90 of each phase. For example, after the terminal of the bypass cable 98 on the power supply side is connected to the U phase, the terminal of the other bypass cable 98 is connected to the V phase and the W phase. At this time, since the main line 90 is charged, the voltage from the main line 90 goes to the bypass cable 98 of the other phase via the already connected bypass cable 98 and transformer 95a. Therefore, a voltage from the trunk line 90 is applied to the other end of the bypass cable 98 of the other phase. As a result, if the operator accidentally comes into contact with the end of the bypass cable 98 of the other phase, there is a risk of electric shock.

[0004] The present invention has been made in view of the problems existing in such prior art, and an object thereof is to form an electric shock when forming a bypass circuit in uninterrupted work. It is an object of the present invention to provide a high-voltage equipment uninterruptible switching device which can surely prevent the occurrence of power failure.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an invention according to a first aspect of the present invention is to provide a transformer for an instrument provided on a distribution line while continuously measuring the amount of electric power used supplied to a customer. In a high-voltage equipment uninterruptible switching device that forms a bypass circuit for high-voltage equipment such as a flow device, a power meter, and a switch, the switch is provided in the bypass circuit and opens and closes the bypass circuit. A transformer connected to the bypass circuit and having a transformer for detecting the voltage of the bypass circuit and a current transformer for detecting the current, and a transformer connected to the transformer for the instrument and supplied to a customer. An electric energy meter for measuring electric energy, and a disconnector provided between a primary side of a transformer and a bypass circuit for opening and closing a circuit between the bypass circuit and the transformer. Things.

The invention of claim 2 is characterized in that an interlock mechanism for disabling the disconnection switch when the switch is opened is provided. The invention according to claim 3 is characterized in that an interlocking mechanism for opening the disconnector in conjunction with opening of the switch when both the switch and the disconnector are closed is provided.

[0007]

According to the first aspect of the present invention, the disconnector is opened between the bypass circuit and the primary side of the transformer. Therefore, when the bypass circuit is formed, the voltage from the distribution line is not applied to the end of the bypass cable via the bypass circuit and the transformer.

According to the second aspect of the present invention, when the switch is opened, the disconnector is locked by the interlock mechanism so that it cannot be closed. According to a third aspect of the present invention, when both the switch and the disconnector are closed, the switch and the disconnector are simultaneously opened by the interlocking mechanism.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 9, a drop switch 1 is provided on a main line 2 as a three-phase distribution line, and a branch line 3 as a distribution line is branched from each drop switch 1. A three-phase branch line 3 is provided with an instrument transformer / current transformer (PCT) 4 and a switch 5 (only one switch-in switch 1 is shown). The power transformer 4 is connected to the power meter 4a, and the power meter 4a measures the power supplied from the branch line 3 to the customer.
In order to maintain the measurement accuracy, the electric energy meter 4a has to be replaced after the usage time has expired for a certain period of time. When replacing the cables for the transformer, current meter 4a, switchgear 5 or branch line 3 for the instrument due to periodic inspection and maintenance, etc., the trunk lines 2 and 3 are connected via the bypass cable 6. The connection terminal of the power failure switching device 7 can be connected.
The connection of the bypass cable 6 forms a bypass circuit B.

The uninterruptible switching device 7 will be described.
As shown in FIG. 1, a gas opening / closing section 8 (gas is used as an insulating medium) is provided in a bypass circuit B composed of three phases of a U phase, a V phase, and a W phase. The gas opening / closing unit 8 is opened / closed by a mechanism unit 9, and the mechanism unit 9 is opened / closed by a control unit 10. The control unit 10 includes a battery 11, a power detection phase detection unit 12, and a ground fault short-circuit detection unit 13, and the battery 11 and each of the units 12, 13 are mutually connected. A cut-off relay 14 is provided for the U-phase and the W-phase of the bypass circuit B on the power supply side of the gas switching unit 8.
Is provided, and the cut-off relay 14 is connected to the ground fault short-circuit detection unit 13. When the cutoff relay 14 detects that an overcurrent has flowed through the gas switching unit 8, the control unit 10 does not open the gas switching unit 8 to the closed state.

A bypass circuit B on the load side of the gas switching unit 8 has a zero-phase current transformer (ZC) for detecting a zero-phase current.
T) 15 and a zero-phase transformer (Z) for detecting a zero-phase voltage.
PD) 16 are provided, and both 15 and 16 are connected to the ground fault short-circuit detection unit 13. Then, the ground fault short-circuit detection unit 13 determines whether the ground fault has occurred on the power supply side or the load side based on the zero-phase current and the zero-phase voltage detected by the two units 15 and 16 and their phase relationship. Has become. The zero-phase current transformer 15 and the zero-phase voltage detector 16
Each of the phases of the bypass circuit B between them is provided with a current limiting fuse 17. When an overcurrent flows due to a short circuit accident or the like on the load side by the current limiting fuse 17, the uninterruptible switching device 7 and the bypass cable 6 are not damaged.

Voltage sensors 18 and 19 are connected to the respective phases of the bypass circuit B on the power supply side and the load side of the gas switching unit 8.
2 are connected. Then, based on the voltages detected by the voltage sensors 18 and 19, the voltage detection phase detection unit 12
Voltage detection and phase detection can be performed when the bypass cable 6 is connected by bypass. In the unlikely event that the phases are missing or the phases between the power supply side and the load side are connected in different phases, the gas switching unit 8 is locked by the control unit 10 so as not to be turned on.

In the bypass circuit B on the load side of the gas switching unit 8, an instrument current transformer (PCT) 20 is provided.
1 is connected. The power meter 21 measures the amount of power supplied to the consumer via the bypass circuit B. The instrument current transformer 20 includes a current transformer 22 and a transformer 23. The current transformers 22 are provided in the U and W phases of the bypass circuit B, and detect phase current values in the U and W phases. The primary side of the transformer 23 is connected to each phase of the bypass circuit B, and detects a voltage between the phases on the load side. A disconnector 25 is provided between the primary side of the transformer 23 connected to the U and W phases and the bypass circuit B. The disconnector 25 is locked by the interlock mechanism R1 provided in the mechanism unit 9 so that it cannot be closed when the gas switch unit 8 is opened. The disconnector 25 is opened by the interlocking mechanism R2 provided in the mechanism section 9 when the opening / closing section operation handle 27 of the gas opening / closing section 8 is opened.

Next, the interlock mechanism R1 and the interlocking mechanism R2 will be described. As shown in FIGS. 3 and 6, a first drive shaft 28 is rotatably supported by the main body case 26, and an opening / closing section operation handle 27 is integrally fixed to an outer end protruding from the main body case 26 to the outside. Have been. By turning the first drive shaft 28 in the charging / opening direction, the gas opening / closing unit 8 can be charged / released via the mechanism unit 9.
A first drive lever 29 is integrally fixed to a first drive shaft 28 in the main body case 26. At one end of the first drive lever 29, a connecting pin 30 is protruded, and the connecting pin 30 is inserted through the through hole 3 formed at the left end (left end in FIG. 3) of the interlocking link 31.
2 is rotatably engaged. A split pin 34 is inserted into the connecting pin 30 via a washer 33 to prevent the two 29 and 31 from being detached.

On the other hand, the second drive shaft 36
Is rotatably supported, and the disconnector operating handle 35 is integrally fixed to an outer end protruding from the main body case 26 to the outside. A second drive lever 37 is fixed to a second drive shaft 36 in the main body case 26. Second drive lever 3
A sliding pin 38 protrudes from a side surface of the sliding link 7, and the sliding pin 38 is slidably engaged in a long hole 31 a provided in the right end (the right end in FIG. 3) of the interlocking link 31. I have. A split pin 40 is inserted into the sliding pin 31a via a washer 39 in order to prevent the two pins 31, 37 from coming off.

Then, as shown in FIG.
Is located at the left end of the elongated hole 31a, the disconnector operation handle 35 is rotationally locked in the closing direction (the direction of the arrow indicated by the solid line in FIG. 3). Conversely, when the slide pin 38 is located at the right end of the long hole 31a, the disconnector operation handle 35 is rotatable in the closing direction. In addition, when both handles 27 and 35 shown in FIG.
The first drive lever 29 and the interlocking link 31 are moved by rotating the opening / closing section operation handle 27 in the opening direction (the direction of the arrow indicated by the two-dot chain line in the figure), and the sliding pin 38 is attached to one end of the long hole 31a. Is driven to be pressed. Therefore, the second drive lever 37 is turned in the opening direction, and the second drive shaft is turned. As a result, the disconnector 25 is opened. Further, the disconnecting switch operation handle 35 is opened and rotated in conjunction with the movement of the interlocking link 31.

Note that, as shown in FIG.
Stopper bolts 41 and 42 are fixed to the inner side surface of the bracket through brackets 43 and 44. Also, the first drive shaft 2
A hitting piece 45 that can abut against the stopper bolts 41 and 42 is fixed to 8. When the opening / closing section operation handle 27 is turned in the closing direction (the direction of the arrow indicated by the two-dot chain line in FIG. 3), the upper stopper bolt 41 strikes the hitting piece 45.
The upper end surface of the opening abuts against the head of the stopper bolt 41 to restrict the rotation of the opening / closing section operation handle 27. The lower end of the stopper bolt 42 comes into contact with the stopper bolt 42 when the opening / closing section operation handle 27 is turned in the opening direction (the direction of the arrow indicated by the two-dot chain line in FIG. 5). Thus, the rotation of the opening / closing section operation handle 27 is restricted.

As shown in FIG. 3, the opening / closing section operation handle 2
Reference numeral 7 denotes a fixed plate 46 fixed to the first drive shaft 28, and a detachable plate 47 detachable from the fixed plate 46. That is, as shown in FIGS. 6 to 8, one end of the attaching / detaching plate 47 is an engaging portion 48 formed in an elongated box shape opening from the end face side. The fixing portion 46 is provided on the engaging portion 48.
An engagement groove 49 into which the tip of the head can be engaged is formed. A pair of leaf springs 50 are screwed to upper and lower side walls of the engagement portion 48 with screws 51. A bent portion 50 a having a concave shape is formed at the tip of both leaf springs 50, and the bent portion 50 a
Has been extended into. On the other hand, a pair of engagement recesses 52 are formed on both side surfaces of the distal end portion of the fixing plate 46. And
When the tip of the fixed plate 46 is engaged in the engagement groove 49, the bent portion 50a is engaged in the engagement recess 52 against the elastic force. In addition, a stopper pin 47a is protruded inside the engagement groove 49, and a fixed insertion amount of the fixing plate 46 is secured.

Next, a specific mechanism of the gas switching unit 8 and the disconnector 25 will be described. As shown in FIG. 2, a gas switchgear 8, a disconnector 25, an instrument transformer and current transformer 4 and the like are built in a main body case 26, and a gas-filled switchgear filled with an arc-extinguishing gas such as SF6. A case 56 is housed. On the left and right side walls of the opening / closing section case 56, bushing through-holes 53 are provided in upper and lower stages corresponding to each phase.
A power supply-side bushing 54 and a load-side bushing 55 penetrate through the bushing through hole 53 provided on one side wall (the left side in the figure) through the upper stage and the lower stage through the mounting bracket 57 with a mounting bolt (not shown). Fixed. The bypass cables 6 are detachable from the bushings 54 and 55 of each phase. Further, bushings 63 and 64 for connecting the current limiting fuse 17 are passed through the bushing through holes 53 provided on the other side wall (the right side in the drawing) of the opening / closing section case 56 for each phase. Similar to the power supply side and load side bushings 54 and 55, they are fixed via mounting brackets 57 by mounting bolts (not shown). A current limiting fuse 17 is connected between the bushings 63 and 64 for each phase via a fuse holder. An O-ring 58 is hermetically disposed between the inner peripheral surface of the bushing through hole 53, the power supply side and load side bushings 54, 55, and the bushings 63, 64.
One end of a bellows 59 made of synthetic rubber that is strong against the decomposition gas of the arc-extinguishing gas is fitted on the inner end of the bushing 63. A support cylinder 60 is hermetically attached to the other end of the bellows 59. Although not shown, a movable contact is provided in the support cylinder 60, and a fixed electrode 61 provided at the inner end of the power supply side bushing 54 can be sandwiched and contacted in the movable contact.

An interlocking shaft 66, which is drivingly connected to the first drive shaft 28 via the mechanism 9, is rotatably supported on the opening / closing case 56. One end of an operation lever 67 is fixed to the interlocking shaft 66 so as to be integrally rotatable. One end of a connecting lever 85 is rotatably supported on the other end of the operating lever 67 via a connecting link 68. The base end of the connecting lever 85 is integrally supported by an operating shaft 69 supported by the opening / closing section case 56. The operating shaft 69 extends so as to cover each phase, and a swing arm 70 is fixed to the operating shaft 69 with a bolt for each phase. A linking protrusion 71 is fixed to the inner surface of the swing arm 70, and the linking protrusion 71 is engaged with a slight play in a linking groove 72 formed on the outer surface of the support cylinder 60.

When the opening / closing section operation handle 27 is manually turned in the closing direction (the direction indicated by the two-dot chain line in FIG. 3), the support cylinder 60 moves to the position indicated by the two-dot chain line in FIG. As a result, the gas switching unit 8 is turned on. Conversely, the opening / closing portion operation handle 27 is opened in the opening direction by manual operation (the direction indicated by the two-dot chain line in FIG. 3).
When the support cylinder 60 is rotated, the support cylinder 60 is moved in the direction shown by the solid line in FIG. 2, and as a result, the gas opening / closing section 8 is opened.

An interlocking shaft 73, which is drivingly connected to the second driving shaft 36 via the mechanism 9, is rotatably supported by the opening / closing case 56. One end of an operation lever 74 is integrally fixed to the interlocking shaft 73. The other end of the operating lever 74 is rotatably connected to the distal end of a link lever 76 via a first link 75. The base end of the link lever 76 is integrally supported by an operating shaft 77 supported by the opening / closing section case 56. One end of an interlocking lever 78 integrally connected to the operating shaft 77 is fixed, and the other end of the interlocking lever 78 is rotatable via a second link 79 with a movable electrode 80 forming a part of the disconnector 25. Are linked. The base end of the movable electrode 80 is rotatably supported by the tip of a support bushing 81 fixed to the inner wall of the opening / closing section case 56, and the tip is inserted into a fixed electrode 82 provided at the inner end of the bushing 63. Contact is possible.

When the disconnecting switch operation handle 35 is manually turned in the closing direction (the direction of the arrow indicated by the solid line in FIG. 4), the movable electrode 80 is moved to the position indicated by the two-dot chain line in FIG. As a result, the disconnector 25 is closed. Conversely, the disconnector operation handle 3 is manually operated.
When the switch 5 is rotated in the opening direction (the direction indicated by the solid arrow in FIG. 4), the movable electrode 80 is moved to the position indicated by the solid line in FIG. 2, and as a result, the disconnector 25 is opened. I have.

Next, a method for replacing the electric energy meter 4a using the uninterruptible switching device 7 configured as described above will be described. Before the formation of the bypass circuit B, it is assumed that the gas switching unit 8 and the disconnector 25 are both open.

One end of the bypass cable 6 is connected to the power supply side and the load side bushings 54 and 55 of the uninterruptible switching device 7. The other end of the bypass cable 6 on the power supply side is sequentially connected to each phase of the trunk line 2 which is a construction section target using a live tool or the like. On the other hand, the other end of the bypass cable 6 on the load side is connected to the branch line 3 of each phase,
Connect to The connection of the bypass cables 6 on the power supply side and the load side forms a bypass circuit B. When the bypass cable 6 on the load side is connected to the branch line 3, the path between the transformer 23 and the bypass circuit B is opened by the disconnector 25. Therefore, the voltage from the branch line 3 is not applied to the bypass cable 6 that is not connected via the connected bypass cable 6 and the transformer 23.

When the bypass circuit B is formed, the voltage detection and phase detection is performed in the voltage detection and phase detection unit 12. If the load side is out of phase or if the phase between the power supply side and the load side is connected out of phase, a warning light (not shown) provided on the voltage detection phase detection unit 12 is displayed, and Inform. At the same time, the control unit 10 is locked so that the gas opening / closing unit 8 is not turned on. If the power detection phase is normal, as will be described in detail later, after turning on the gas switch 8 and the disconnector 25, the drop-in switch 1 and the switch 5 corresponding to the branch line 3 targeted for the construction section are opened. Is done. By this opening, power supply to the trunk line 2 and the branch line 3 in the construction section is stopped. While the power supply is stopped, the electric energy meter 4a is replaced and replaced with a new electric energy meter 4a.

Next, the operation of the interlock mechanism R1 in forming the bypass circuit B will be described.
As shown in FIG. 3, when the bypass circuit B is closed, the opening / closing section operation handle 27 is rotated in the direction indicated by the two-dot chain line in FIG. Then, the first drive lever 29 is rotated in the same direction as the opening / closing section operation handle 27, and the gas opening / closing section 8 is turned on. At the same time, the first drive lever 29
The link 31 is moved to the left in FIG. By this movement, as shown in FIG. 4, the elongated hole 31a and the sliding pin 38 are relatively moved, and the sliding pin 38 is located at the right end of the elongated hole 31a. As a result, the bypass circuit B is closed, and the locked state of the disconnector operation handle 35 is released.

Subsequently, as shown in FIG. 4, the disconnector operating handle 35 is turned in the direction of the arrow indicated by the solid line in FIG. Then, the second drive lever 37 is rotated in the same direction as the disconnector operation handle 35, and the disconnector 25 is closed. At the same time, the sliding pin 38 is moved along the long hole 31a. By this movement, the sliding pin 38 comes into contact with the left end of the long hole 31a.

Further, the operation of the interlocking mechanism R2 will be described. After the replacement work of the electric energy meter 4a is completed,
When the bypass circuit B is opened, as shown in FIG. 5, the opening / closing section operation handle 27 is rotated in the direction indicated by the two-dot chain line in FIG. Then, the first drive lever 29 is rotated in the same direction as the opening / closing section operation handle 27, and the gas opening / closing section 8 is opened. At the same time, the first drive lever 29
The interlocking link 31 is moved rightward in FIG. With this movement, the sliding pin 38 is driven to the left end of the long hole 31a and is integrally moved in the same direction.
The second drive lever 37 is turned in the same direction as the opening / closing section operation handle 27. By this rotation, the disconnector operation handle 35 is rotated in the opening direction. As a result, the disconnector 25 is opened at the same time that the bypass circuit B is opened.

Accordingly, in the uninterruptible switching device 7 of this embodiment, the disconnector 25 is provided between the primary side of the transformer 23 and the bypass circuit B. For this reason, when forming the bypass circuit B, the voltage from the branch line 3 is applied via the bypass cable 6 and the transformer 23 already connected to the branch line 3.
It is possible to prevent application to the bypass cable 6 that is not connected. As a result, an electric shock accident to the worker can be prevented, and the bypass circuit B can be formed safely.

When the bypass circuit B is formed, the disconnector 25 is locked by the interlock mechanism R1 so that the disconnector 25 cannot be closed when the gas switching unit 8 is open. For this reason, the disconnector 2
It is possible to prevent the formation of the bypass circuit B in a state in which 5 is turned on. As a result, an electric shock accident to the worker can be prevented, and the bypass circuit B can be formed safely.

When the bypass circuit B is opened after the replacement work of the electric energy meter 4a is completed, the gas switch 8 is opened and the disconnector 25 is opened at the same time.
Therefore, forgetting to disconnect the disconnector 25 can be reliably prevented. For this reason, at the time of uninterrupted construction of another trunk line 2 or branch line 3, the bypass circuit B is not formed with the disconnector 25 turned on. As a result, an electric shock accident to the worker can be prevented, and the bypass circuit B can be formed safely.

It should be noted that the present invention is not limited to the above-described embodiment, and may be appropriately changed as follows without departing from the spirit of the present invention. (1) Although the gas switching unit 8 is provided in the uninterruptible switching device 7 in the above embodiment, an air switch may be used instead of the gas switching unit 8.

(2) In the above embodiment, the disconnector 25 is provided between the primary side of the transformer 23 connected to the U and W phases and the bypass circuit B. In addition, U-phase, V-phase and W-phase
A disconnector 25 may be provided between the primary side of the transformer 23 connected to the phase and the bypass circuit B. Further, a disconnector 25 may be provided between the primary side of the transformer 23 connected to the U-phase and the V-phase and the bypass circuit B. Alternatively, V phase and W
A disconnector 25 may be provided between the primary side of the transformer 23 connected to the phase and the bypass circuit B.

[0035]

As described above, according to the first aspect of the present invention, when forming a bypass circuit in uninterrupted work,
Electric shock accidents can be reliably prevented.

According to the second aspect of the present invention, in addition to the above effects, it is possible to prevent a bypass circuit from being formed in a state where the disconnector is turned on due to a human error or the like. it can.

According to the third aspect of the present invention, in addition to the above effects, when the uninterruptible work is completed and the bypass circuit is opened, forgetting to disconnect the disconnector can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an electrical configuration of a high-voltage equipment uninterruptible switching device embodying the present invention.

FIG. 2 is a partially cutaway sectional view showing an open state of a gas switching unit and a disconnector.

FIG. 3 is a front view of an interlock mechanism and an interlocking mechanism, similarly showing a state where a gas switching unit and a disconnector are opened.

FIG. 4 is a front view of an interlock mechanism and an interlocking mechanism, similarly showing a closed state of a gas switching unit and an opened state of a disconnector.

FIG. 5 is a front view of the interlock mechanism and the interlocking mechanism, similarly showing a state where the gas switching unit and the disconnector are turned on.

FIG. 6 is a plan view of the interlock mechanism and the interlocking mechanism.

7 is a sectional view taken along the line AA of FIG. 6;

FIG. 8 is an exploded perspective view showing the opening / closing section operation handle.

FIG. 9 is an explanatory diagram showing a state in which a bypass circuit is formed.

FIG. 10 is a circuit diagram showing a high-voltage equipment uninterruptible switching device according to the related art.

[Explanation of symbols]

2. Trunk line (distribution line), 3-branch line (distribution line), B ... bypass circuit, 8 ... gas switch (switch), 20 ... current transformer for instrument, 22 ... transformer, 23 ... transformer , 21 ... Electricity meter, 25 ... Disconnector, R1 ... Interlock mechanism, R2
… Interlocking mechanism

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuhiko Mori No. 1 Kamikobari, Inuyama-shi, Aichi Energy Support Co., Ltd. (56) References JP-A-6-38407 (JP, A) JP-A-3-273833 (JP, A) JP-A-3-98430 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02J 9/06 501 H02J 3/00-3/50

Claims (3)

(57) [Claims] 1. A bypass circuit is formed by a high-voltage device such as a transformer for a meter, a power meter, or a switch provided on a distribution line while measuring the amount of electric power supplied to a customer. In a high-voltage equipment uninterruptible switching device that works without interruption, a switch installed in the bypass circuit to open and close the bypass circuit, a transformer connected to the bypass circuit to detect the voltage of the bypass circuit, and a current are detected Voltage transformer with an active current transformer, a power meter connected to the voltage transformer for metering, and measuring the amount of power used to customers, primary and bypass circuits of the transformer And a disconnector for opening and closing a circuit between the bypass circuit and the transformer. 2. The high-voltage equipment uninterruptible switching device according to claim 1, further comprising an interlock mechanism for disabling the disconnection switch when the switch is opened. 3. The high-voltage device according to claim 1, further comprising an interlocking mechanism for opening the disconnector in conjunction with the opening of the switch when both the switch and the disconnector are closed. Power failure switching device.