JPS644412B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is one of the automation equipment for distribution line system operation, which is combined with an automatic section switch that opens circuits without voltage, and which automatically detects the fault section of the distribution line and transmits power to the fault section. In the selective order transmission accident investigation device, which stops the power supply and transmits power to healthy sections, the accident investigation device is designed to be able to perform maintenance and inspection without disconnecting the sectional switch while it is mounted on a pole. Concerning dexterity testing equipment.

This type of conventional accident investigation device for sequential transmission is mounted on a utility pole, and uses a built-in timer to determine the presence or absence of voltage on the power distribution line, and controls the sectional switch. In this case, depending on the fault point and accident situation on the distribution line, even if only the voltage on the power supply side is present (forward power transfer) or only the voltage on the load side is present (reverse power transfer), the handle operation position not only gives a closing command to the sectional switch. When the handle is in the "direct delivery position", the internal circuit is disconnected and the section switch is turned on with just a switch, allowing maintenance and inspection of the section switch to be performed without disconnecting the section switch.

FIGS. 1 and 2 show the mounting state and circuit configuration of such an accident investigation device, and the details thereof will be explained below.

Figure 1 is a diagram of the installation of power distribution automation equipment on poles.
is a high-voltage distribution line suspended from a utility pole 40. Further, 12 is a division switch installed at the division point of the distribution line 11, 13 is a power supply side transformer, 14 is a load side transformer, 15 is an accident investigation device for selective sequential transmission, and each of these devices is installed on a utility pole 40. It is mounted on the pole as shown.

Figure 2 shows the combined connections of the high-voltage distribution line 11, the sectional switch 12, the power supply side and load side transformers 13, 14, the accident investigation device 15 for selective sequential transmission, and the accident investigation device 1.
5 is a circuit configuration diagram of a power supply switching circuit section of No. 5; FIG. In FIG. 2, reference numeral 11 indicates a high voltage distribution line, and 12 indicates a section switch inserted into each phase line of the high voltage distribution line, which is controlled by a selective forwarding fault investigation device 15, the details of which will be described later. 13 is a power supply side transformer to which the primary side voltage is applied from the high voltage distribution line 11, the output obtained from the secondary side is rectified into three phases by a rectifier R _f , and the DC voltage is selected and forwarded to the accident investigation device 15 It is intended to supply On the other hand, accident investigation device 15 for selection order
In the figure, reference numeral 16 denotes an operation determining element circuit section, which controls the relay _X1 by its output. _D1 ,
D ₂ is a diode provided in the power supply switching circuit section serving as the input section of the operation determining element circuit section 16 .
SW1 to SW5 are the same operation determination element circuit section 16.
Each switch provided in the power supply switching circuit section which serves as an input section of
This is used to switch the input power to the 1
7 is an adapter cable (cable with plug)
The power supply side transformer 13 and the load side transformer 14 are connected to the spare terminal 18 provided in the section switch 12.

Next, we will discuss the effect. When there is voltage on either the power supply side or the load side of the high-voltage distribution line 11, the operation handle (not shown) is operated to a handle position that allows a closing command to be given to the section switch 12, that is, the "selection position or forward/reverse position". Then, the switches SW1, SW3, SW4, and SW5 are closed, and the switch SW2 is opened. If an accident occurs on the load side of the distribution line in this state, the substation's shiya breaker (not shown) will open, and after a scheduled period of time, the power supply side voltage will be restored by turning the shiya breaker back on. . In this case, if the accident does not continue and is cleared, the disconnector will not disconnect again. Then, power is supplied from the power supply side transformer 13 to the accident investigation device 15, the operation determination element circuit section 16 is activated, and after a certain period of time, the relay is activated.
_X1 works. This closes the contact X ₁ -a, and the power supply voltage is applied to the section switch 12 via the path from the diode D ₁ to the contact X ₁ -a, thereby closing the section switch 12. When the sectional switch 12 is turned on, voltage is supplied to the load side, and the high-voltage distribution system is in a normal operating state.

By the way, in this operating state, section switch 1
Accident investigation device 15 for selective delivery without cutting off 2.
To maintain and inspect the system, first move the operating handle to the handle position where switches SW4 and SW5 are open, that is, the "direct feed position".The operation determining element circuit section 16 is disconnected, and only the power supply switching circuit section is used. A closing command is given to the switch 12. In this handle position, SW1, SW2, and SW3 are closed, so if there is voltage on either the power supply side voltage or the load side voltage, the section switch 12 is immediately turned on. Next, the adapter cable 17 is first connected to the spare terminal 18 of the sectional switch 12 (this terminal is connected in parallel with the control power terminal of the sectional switch 12), and the other end is connected to the power supply side transformer 13.
After supplying voltage in parallel from the power supply side to the sectional switch 12, remove the cable between the power supply side transformer 13 and the accident investigation device 15, and then connect the load side transformer 14 and the sectional switch 12 in the selected order. The cable between the transportation accident investigation device 15 was removed and the accident investigation device 15 was lowered to the pole for maintenance and inspection. Also, when replacing a pillar, the same method was used to lower it. When the maintenance and inspection of the accident investigation device 15 for selective sequential transmission is completed, the accident investigation device 15 for selective sequential transmission is mounted on the pole again, and this accident investigation device 15, the power supply side transformer 13, and the load side transformer 1 are installed.
4. After connecting the section switches 12, disconnect the adapter cable 17 and connect the accident investigation device 1 to the selected order.
The work is completed by returning the handle No. 5 from the "direct delivery" position to the predetermined position.

In this way, in order to maintain and inspect the accident investigation device 15 for sequential transmission without disconnecting the divisional switch 12,
After connecting the sectional switch 12 and the power-side transformer 13 with the adapter cable 17, the connection is made between the power-side transformer 13 and the accident investigation device 15 for selective forwarding, and then between the load-side transformer 14 and the sectional switch. Since the cable between the accident investigation device 12 and the selected sequential transmission accident investigation device 15 was removed and the accident investigation device was lowered from the pole, maintenance and inspection not only take time, but also the work such as connecting the adapter cable 17 is complicated. Moreover, since the work involved installing and lowering the poles, two or more workers were always required, and the labor costs for maintenance and inspection were high. Furthermore, since the work involves live wires, it is not only dangerous, but also prone to errors in the working method, which is not desirable from the standpoint of stable power supply.

The present invention eliminates the above-mentioned inconveniences, and provides an accident investigation device that allows maintenance and inspection to be carried out without taking down the selected progressive accident investigation device from the pole and without disconnecting the section switch while it is mounted on the pole. The purpose is to provide testing equipment.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows an example of the circuit configuration of the device of the present invention. Parts corresponding to those in FIG. 2 are given the same reference numerals, and their explanation will be omitted, and the configuration of the different parts will be described here. In FIG. 3, switch SW1 of the power switching circuit section of the accident investigation device 15 for selective transmission is shown.
Connect terminal A from the connection point between switch SW4 and SW4.
4 and the operation determination element circuit section 16 of the accident investigation device 15 for selective sequential transmission, terminal B is connected from the connection point between switch SW3 and SW5, and terminal C is connected from the connection point between switch SW5 and the accident investigation device for selective sequential transmission. Terminals D are respectively derived from connection points between the 15 operation determination element circuit units 16. In addition, terminals E and _R1 are derived from the operation determination element circuit section 16 of the accident investigation device 15 for selective forwarding, terminal F is derived from the relay _X1 , and terminal G is also derived from the 0V line of the DC input power source. ,
The structure is such that it can be connected to each of these terminals from the outside using a connector or the like. On the other hand, 20 is a tester installed on the ground as shown in _FIG .
Electrical connection is made by attaching the connector 42 via the connector 1. In this case, the terminals of the accident investigation device 15 and the test device 20 are A and t ₁ , B and t ₂ , C and t ₃ , D and t ₄ , E and t ₅ , and F and
t ₆ , G and t ₇ , and R ₁ and tr ₁ are connected, respectively.

FIG. 4 shows the internal configuration of the operation determining element circuit section 16 in detail. That is, in FIG. 4, OR11 is an OR circuit to which input signals are applied through switches SW4 and SW5, AND11 is an AND circuit to which input signals are also applied through switches SW4 and SW5, and IH11 has one input terminal connected to the output of OR circuit OR11. TX is a closing time circuit to which the output signal of the AND circuit AND11 is applied, and M is the output signal of the closing time circuit TX. The memory circuit TY applied to the terminal S is a detection time detection circuit to which the output signal of the memory circuit M is applied, and the output end of the detection time detection circuit TY is connected to the terminal E mentioned above. Also
OR12 is an OR circuit into which the output signal of the detection time limit detection circuit TY, the signal from the operation handle (not shown), and the signal from the test device 20, which will be described in detail later, are inputted through the terminal _R1 , and the output signal is sent to the memory circuit M. This is applied to the reset terminal R. Further, OR13 is an OR circuit to which the output signal of the memory circuit M and the output signal of the OR circuit _OR11 obtained via the normally open contact _X1 - _a2 of the relay X1 are added. ₁
It is something that can be added to.

FIG. 5 shows an example of the internal configuration of the tester 20 using a block circuit. In FIG. 5, t ₁ ~
As described above, _t7 is a terminal connected to each of the lead-out terminals A to G of the selective forwarding accident investigation device 15 via the cable 41, the terminal _t1 is connected via the switch SW10, and the terminal _t2 is The terminals t _{3 and} t 4 are respectively connected to one input terminal of the direct single power supply determining circuit 22 through the switch SW11, and the terminal t ₄ is connected to the other input terminal of the direct single power supply determining circuit 22 . The anode side of the diode D ₁₁ and the cathode side of the diode D ₁₃ are connected to the terminal t ₁ , and the anode side of the diode D ₁₂ and the cathode side of the diode D ₁₄ are connected to the terminal t ₂ , respectively, and the diodes D ₁₁ and D The cathodes of the diodes D ₁₃ and D 14 are commonly connected to the first input terminal of the control power supply circuit 21, and the anode sides of the diodes D ₁₃ and D ₁₄ are commonly connected to the second input terminal of the control power supply circuit 21, respectively. Further, a terminal _t7 is connected to the third input terminal of this control power supply circuit 21, and an AC
A power outlet 28 is connected to output the control power e for the internal circuit. The single power source determination circuit determines whether or not it is a single power source based on the presence or absence of signals input through switches SW10 and SW11, and as shown in the figure, transistors TR ₁ , TR ₂ , Zener diodes ZD ₁ ,
ZD ₂ , resistors R ₁ to R ₆ , R ₈ , NOR circuit NOR ₁ , NAND circuit NAND ₁ , NOT circuit NOT ₃ , AND circuit
Consists of AND ₃ . On the other hand, 23 is the input terminal
This is an accident investigation device output determination circuit that determines the operation of the accident investigation device connected to t ₅ and t ₆ respectively.
It is configured as shown in the figure by NOT ₅ , AND circuit AND ₅ , and NOR circuit NOR ₃ . 25 starts a counting operation when the single power source determination circuit 22 applies a determination output indicating that the power source is a single power source to the accident investigation device output determination circuit 23, and when the accident investigation device output determination circuit 23 determines the operation of the accident investigation device. The counting circuit 25 is a counting circuit that stops the counting operation, and the output pulse of a pulse generating circuit 24 made of, for example, a crystal oscillator is input to this counting circuit 25. Further, 26 is a count display section that displays the count contents of the counting circuit 25.
Furthermore, 27 is a function determination display unit that determines and displays the function of the accident investigation device based on the determination output indicating that it is a single power supply inputted from the accident investigation device output determination circuit 23 and the operation determination output of the accident investigation device. Reference numeral 29 denotes a lock release circuit which applies a reset signal "r ₁ " to the memory circuit M of the operation determination element circuit section 16 through the output terminal _tr1 . This lock release circuit 29 is composed of a resistor R ₉ and a push button switch PBS ₄ . ing. Further, 30 is a return circuit that outputs a return signal “r ₂ ” to the counting circuit 25 and the function judgment display unit 27;
consists of a resistor R ₁₀ and a push button switch PBS ₃ .

Next, the operation of the apparatus of this embodiment configured as described above will be described. First, the operation of the operation determination element circuit section 16 of the sequential accident investigation device 15 will be explained with reference to FIGS. 3 and 4. Now, in FIG. 3, when the handle (not shown) is operated to move the handle to a position where a closing command can be given to the section switch 12, that is, the "selection position or progressive position", switches SW1, SW3, SW4, and SW5 are closed. ,
SW2 is open. In such a state, if the sectional switch opens due to an accident on the load side of the distribution line, and then voltage is applied to the high voltage distribution line 11 side, this voltage will be transferred from the high voltage distribution line 11 to the power supply side transformer 13 to the switch.
The signal is applied to the operation determination element circuit section 16 through the path SW1-SW4. Then, the fourth
In the figure, in the operation determination element circuit section 16, the condition is that voltage is present on the switch SW4 side and voltage is absent on the switch SW5 side, so the output of the OR circuit OR11 is "1" and the output of the AND circuit AND11 is "0". Therefore, since the inputs of the inhibit circuit IH11 are "1" and "0", the output becomes "1", and the closing time limit circuit TX starts counting the closing time. When the closing time limit circuit TX finishes counting the closing time, the closing time limit circuit TX outputs "1" and sets the memory circuit M. When this memory circuit M is set, its output becomes "1", so the output of the OR circuit OR13 becomes "1", the closing relay _X1 operates, and its normally open contact _X1
-a closes the section switch 12, and closes the normally open contact _X1 - _a2 to self-hold the close relay _X1 . As a result, voltage is supplied to the load side, and the power distribution system is in a normal operating state.
On the other hand, at the time when the memory circuit M is set, the detection time limit circuit TY starts counting the detection time limit, and when the count of the detection time limit ends, its output becomes "1", and the memory circuit M is connected to the OR circuit 12. to return to normal state. If an accident occurs again on the high-voltage power distribution line 11 side while the detection time limit circuit TY is counting the detection time limit, and the circuit breaker on the power station side is disconnected again and then reclosed, the inhibit circuit will be closed by the above-mentioned route. The output of IH11 becomes "1", but since the memory circuit M has not been reset at this time, the output of the memory circuit M does not become "1" even if the output of the closing time limit circuit TX becomes "1". , closing relay _X1 does not operate and becomes locked. This lock can be released by turning an operation handle (not shown) into "off" and "return" positions.

In the above case, the operation occurs when an accident occurs on the load side of the distribution line, but conversely, when an accident occurs on the power supply side of the distribution line, the operation of the fault investigation device for selecting and transmitting interconnection points is performed. Sectional switch for interconnection point (not shown)
is turned on, power is reversed, and voltage is applied to the load side distribution line, so the operation determination element circuit section 16 operates in the same manner as described above, and by giving a closing command to the section switch 12, the power is turned off. supply voltage to the side.

Next, FIGS. 3 to 3 show the operation when maintenance and inspection are performed under such normal operation conditions without disconnecting the divisional switch 12 and without lowering the selected sequential accident investigation device 15. This will be explained with reference to FIG.
First, operate the handle to the handle position where switches SW4 and SW5 are open, that is, the "direct feed, test position" to disconnect the operation determination element circuit section 16, and issue a closing command to the section switch 12 using only the power supply switching circuit section. At the same time, test power is supplied to the operation determination element circuit section 16 via the tester 20. In other words, at this handle position, switches SW1 and SW
2. SW3 is closed, so if there is voltage on either the power supply side voltage or the load side voltage, it will be passed through switch SW1 → diode D ₁ → switch SW2 or switch SW3 → diode D ₂ → switch SW2. Since the section switch 12 is immediately closed, the section switch 12 will not be disconnected.

In addition, when using the power supply side voltage as the test power source for the operation determination element circuit section 16, by connecting the cable 41, the terminal A → the terminal t ₁ of the tester 20 →
Switch SW10 provided in the tester 20 (shown in FIG. 5) → Terminal t ₃ of the tester 20 → Accident investigation device 15
Test power is supplied to the operation determination element circuit section 16 through the terminal B of the test circuit. In this case, the terminal G of the 0V line is connected to the terminal _t7 of the tester 20, making it common.

Contrary to the above, when using the load side voltage as the test power source, by connecting the cable 41, terminal C → terminal t ₂ of the tester 20 → switch SW11 installed inside the tester 20 (as shown in Figure 5) ) - terminal t ₄ of the tester 20 → terminal D of the accident investigation device 15 , and the test power supply is supplied to the operation determination element circuit section 16 .

Here, in order to simulate a situation where a voltage is applied to the high-voltage distribution line 11 on the power source side, the switch SW10 of the test device 20 may be closed. That is, when the switch SW10 is closed, the power supply side high voltage distribution line 11
- Power supply side transformer 13 - Switch SW1 - Terminal A -
A voltage is applied to the operation determination element circuit section 16 of the selective sequential accident investigation device 15 through the path of terminal t ₁ -switch SW10 - terminal t _{3 -terminal} B. Then, as mentioned above, the closing time limit circuit of the operation determination element circuit section 16
As soon as the TX starts counting the turn-on time, the tester 20 also connects the power supply side distribution line 11 to the power supply side transformer 13.
- Switch SW1 - Terminal A - Terminal t ₁ - Switch SW
The voltage on the power supply side is applied to the single power supply determination circuit 22 through the path No. 10. Then, in the single power supply determination circuit 22, the transistor TR1 is turned on, and the transistor _TR1 is turned on.
Since TR ₂ remains off, the output of the NAND circuit NAND ₁ changes from "0" to "1". On the other hand, Noah circuit
Since the output of NOR ₁ is “0”, the NOT circuit NOT ₃
The output of becomes “1”, therefore, the AND circuit
The output of AND ₃ becomes "1". On the other hand, in the selective sequential accident investigation device 15, since the input time limit has not yet been counted, the terminal _t6 is in the "0" state, and therefore the output of the NOT circuit _NOT5 is "1". From this, the output of the AND circuit AND ₅ is the NOT circuit.
Since the output of NOT ₅ is "1" and the output of AND circuit AND ₃ is "1", it becomes "1", so the function judgment display section 27 displays that the closing time is being counted, and the counting circuit 25 indicates that the closing time is being counted. is counted and displayed on the count display section 26. In this case, the pulse generating circuit 24 generates a pulse output simultaneously with the application of the control power supply e. When the input time of the accident investigation device 15 for selective sequential transmission ends, the operation determination element circuit section 16 shown in FIG.
The output of the input time limit circuit TX is “1”, and the output of the memory circuit M
The output of is “1” and the output of OR circuit OR13 is “1”
Then, the detection time limit circuit TY starts counting the detection time limit and the closing relay _X1 operates.
Also, at this time, the OR circuit for the tester 20 is
The output "1" of the OR 13 is applied to the NOT circuit NOT ₅ of the accident investigation device output determination section ₂₃ via the path from the terminal E to the terminal t6, and the output of this NOT circuit NOT ₅ changes from "1" to "0". Therefore, the AND circuit AND ₅
The output changes from "1" to "0" to determine the end of the closing time period and the operation of closing relay _X1 . Furthermore, when the output of the AND circuit AND ₅ becomes "0", the output of the NOR circuit NOR ₃ changes from "0" to "1", and the function judgment display section 27 displays the start of counting of the detection time limit, and the counter circuit 25 The detection time limit is counted and displayed on the count display section 26. When the detection time limit of the accident investigation device 15 for selective forwarding ends, the detection time limit circuit TY of the operation determination element circuit section 16 shown in FIG.
Since the output of the OR circuit OR12 becomes "1", the memory circuit M is reset and the tester 20 is connected via the path from terminal E to terminal _t5 .
Output “1” is added to. Therefore, the input of the NOR circuit NOR ₃ of the accident investigation device output determination unit 23 is “1”,
Since it becomes "1", its output becomes "0". As a result, it is determined that the detection time period has ended, and the function determination display section 27 displays the end, the counting circuit 25 stops counting, and the count display 26 displays the detection time period.

Next, to check the lock function of the accident investigation device 15 for sequential transmission, after the operation judgment element circuit section 16 has finished counting the closing time, the detection time circuit TY opens the switch SW10 of the tester 20 while counting the detection time. And it is sufficient. As a result of this operation, the selection sequential accident investigation device 15 does not set the output of the detection time limit circuit TY of the operation determination element circuit section 16 to "1" and does not return the memory circuit M to the reset state, so it resets the switch SW1 again.
Even if a voltage is applied with 0 closed, the output of the memory circuit M will not become "1". From this, the OR circuit
Since _the output of OR13 remains “0”, relay
doesn't work. The detection time limit circuit TY also does not count the detection time limit, and the output remains at "0".

Therefore, an output of "1" is not given from the terminal F of the accident investigation device 15 for selective transmission to the terminal _t6 of the tester 20, and the AND circuit of the accident investigation device output determination circuit section 23 of the tester 20 Since the output of AND ₅ remains "1", the function judgment display section 27 displays it without a collar, and the counting circuit 25 continues counting and displays it on the counting display section 26, so the accident investigation device for sending in the selection order 15 locks can be determined.

On the other hand, when the selection sequential transmission accident investigation device 15 is unlocked by moving the operation handle (not shown) to the "off, return" position, the division switch 12 is opened as described above. However, this tester is equipped with a reset circuit 29 that can be unlocked from the tester side, so the reset push button switch cannot be pressed afterwards.
By pressing PBS ₄ , the lock release signal output "1" is sent from the terminal tr ₁ of the tester 20, and the OR circuit OR 12 of the operation judgment element circuit section 16 is sent from the terminal "R ₁ " of the selected sequential transmission accident investigation device 15. The lock is released by setting the output to "1" and applying this to the memory circuit M to reset it. In other words, by using this tester, it is possible to unlock the sequential transmission fault investigation device 15 without disconnecting the divisional switch 12, that is, without affecting the power distribution system.

In addition, the return circuit 30 is activated by pressing the return push button switch PBS ₃ .
7. A reset signal "r ₂ " is given to the counting circuit 25 and the count display section 26 to restore them.

Although the above explanation is for the selection time period, the test can also be performed in the same way for the forward/reverse time period by moving the operating handle (not shown) to the "forward/reverse time" position.

The above explanation is for the case where the accident investigation device 15 for selective transmission is tested while mounted on a pole. However, when testing the accident investigation device 15 in a substation or the like before mounting it on a pole, it is necessary to Generally, there is a commercial frequency AC power source. Therefore, when testing with an AC power source, the tester 20 shown in FIG.
, when the AC power outlet 28 is plugged in, the AC-DC converter built in the control power supply circuit 21 connects the DC power to the diodes D ₁₃ , D ₁₄ and the switch SW as a test power source for the accident investigation device 15 for selective sequential transmission.
10, SW11 and terminals t ₂ and t ₄ . Furthermore, the control power e for the internal circuits is also appropriately stepped down and supplied to each internal circuit. The test method is exactly the same as the above-mentioned column mounting condition except that the accident investigation device 15 for selective sequential transmission is placed alone.

As described above, in the device of this embodiment, the terminals B and D connected to the input end of the operation determination element circuit section 16, the terminal F connected to the output end, and the terminals B and D connected to the input end of the operation determination element circuit section 16,
Terminal E is connected to the output terminal of the detection time limit circuit TY, and terminal R is connected to the reset terminal of the memory circuit M.
1. Operation determination element circuit section 1 by power supply switching circuit section
When switch 6 is disconnected from the distribution line, switch SW1,
A connector 42 having terminals A, C, and G connected to the control power supply on the power supply side and the load side via SW2 is attached to the outside of the accident investigation device 15 for selective sequential transmission, and each of the connectors 42 on the ground side Terminals t _{1 to 1} are connected by cables 41 in correspondence with the respective terminals.
t ₇ , tr1, and during the test, the control power supply on the power supply side or load side is used as the test power supply to take in the inspection signal through the terminals t ₁ , t ₂ , and t ₇ , and this inspection signal is sent to the terminal.
switch SW10, which is applied to the input end of the operation determination element circuit section 16 through _t3 , _t4 and terminals B and D;
A switch mechanism consisting of the SW 11, a single power supply determination circuit 22 that determines whether there is a voltage on one side applied to the input terminal of the operation determination element circuit section 16, and each output due to the input of the check signal of the operation determination element circuit section 16 is connected to the terminal _t6. , tr1, and is equipped with a tester 20 equipped with a count display section 26 and a function judgment display section 27 for determining the quality of the function based on the output of the single power supply judgment circuit 22.

Therefore, in the case of a test device having such a configuration, each terminal of the tester 20 installed on the ground side must be connected via a cable 41 to a predetermined test terminal of the accident investigation device 15 for selective sequential transmission. For example, without disconnecting the sectional switch 12 when the distribution system is in constant operation, and without having any effect on the distribution system,
It is possible to inspect the accident investigation equipment while it is still installed. In addition, since only a cable with a connector is connected to the selective forwarding accident investigation device 15, the work is simple, and the time required for maintenance and inspection is not only reduced, but inspection costs are also reduced, and safety is improved. . Furthermore, since the work is simple and reliable, errors in work are minimized, contributing to a stable supply of electric power.

As described above, according to the present invention, test terminals connected to the input and output terminals of the operation determination element circuit section are derived from the outside of the accident investigation device for sequential transmission, and the test terminals are made to correspond to each of these test terminals. It has a connection terminal connected to each other by a cable and a power supply connection terminal connected to a test power supply, and when the operation determination element circuit section is disconnected from the control power supply by the switch mechanism, it can be connected via the power supply connection terminal. Input a check signal that simulates the power supply side or load side of the sectional switch by switching the input circuit of the test power supply voltage that is input through the connection terminal and test terminal corresponding to the input terminal of the operation judgment element circuit section. Determines the operating state of the operation determination element circuit section in response to the input of the inspection signal based on the output signal taken from the output terminal of the operation determination element circuit section through the corresponding test terminal and connection terminal. The configuration is such that a test device equipped with a judgment circuit is installed on the ground side.

Therefore, a testing device is installed on the ground side where the selective sequential accident investigation device that requires inspection is mounted on the pole, and this testing device is used for the specified test of the selective sequential accident investigation device via a cable. By connecting the connector to the terminal, the accident investigation device for selective sequential transmission can be inspected while mounted on the pole without affecting the power distribution system in any way. In particular, since the test can be carried out by simply supplying an inspection signal to the selected sequential accident investigation device by investigating the inspection switch mechanism, not only does the inspection not take much effort, but it can also significantly shorten the time.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing how distribution line automation equipment is installed on poles, Fig. 2 is a circuit diagram showing the mutual connection configuration of each equipment shown in Fig. 1, and Figs. 3 and 4 are diagrams to which the device of the present invention is applied. FIG. 5 is a circuit diagram showing an example of a connection configuration between a distribution line automation device and a tester for the purpose of the present invention. FIG. 5 is a circuit diagram showing the configuration of a tester in an example of the present invention. 11...High voltage distribution line, 12...Division switch, 1
3...Power supply side transformer, 14...Load side transformer, 1
5... Accident investigation device for selective sequential transmission, 16... Operation determination element circuit section, 20... Test device, 21... Control power supply circuit, 22... Single power supply determination circuit, 23... Accident investigation device output determination circuit , 24...Pulse generation circuit, 2
5... Counting circuit, 26... Counting display section, 27...
Function judgment display section, 41...cable, 42...connector, SW1 to SW5, SW10, SW11...
Switch.

Claims (1)

[Claims] 1. When it is determined that there is voltage on either the power supply side or the load side of a normally closed sectional switch located at a division point of a distribution line, the sectional switch An operation determination element circuit unit that gives a power-on command, and an input stage of this operation determination element circuit unit, which is provided at the input stage of the operation determination element circuit unit, and which normally obtains control power from the power supply side or load side distribution line and supplies this control power to the operation determination element circuit unit. and a switch mechanism for disconnecting the operation determination element circuit section from the control power source during testing and switching and connecting the control power source to issue a closing command to the divisional switch. In a test device for an accident investigation device, test terminals connected to the input and output terminals of the operation determination element circuit section are led out from the outside of the accident investigation device, and connected by cables in correspondence with each of these test terminals. and a power supply connection terminal connected to the test power supply, and when the operation determination element circuit section is disconnected from the control power supply by the switch mechanism, the power supply is connected to the power supply connection terminal through the power supply connection terminal. Switching the input circuit of the test power supply voltage to send a check signal simulating the power supply side or load side of the sectional switch to the input terminal of the operation determination element circuit section, and connect the corresponding connection terminal and test terminal. the operation determination element in response to the input of the inspection signal based on the output signal inputted through the inspection switch mechanism, the output terminal of the operation determination element circuit section, the corresponding test terminal, and the connection terminal; A tester equipped with a judgment circuit for determining the operating state of the circuit section is installed on the ground side, and each connection terminal of the tester is connected to the test terminal of the accident investigation device with a connector to conduct accident investigation for selective sequential transmission. A testing device for an accident investigation device, characterized in that the device can be tested. 2. The testing device for an accident investigation device as set forth in claim 1, wherein the power source for testing is obtained from the power supply side of the sectional switch or the load side distribution line via the power switching circuit section of the accident investigation device. .