JPS644413B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is installed at a loop point as one of the automation devices for distribution line system operation, and is used in combination with an automatic section switch that opens the circuit without voltage to automatically identify the accident section using a timed accident investigation method. This is especially important for the maintenance of time-limited accident investigation devices for loop points, which have a simultaneous control function by transporting high-voltage distribution lines, with the aim of disconnecting the line and continuously providing load accommodation to healthy sections in the event of an accident on other lines. This invention relates to a test device for an accident investigation device that allows inspection to be carried out by simple operation while mounted on a pole.

The distribution line automation system appropriately separates high-voltage distribution lines and places switches and accident investigation devices at the separation points to detect accidents that occur on the distribution lines and to connect them to breakers, breakers, and reclosing relays at substations. The response action is to investigate the accident, isolate the accident section, and transfer the load to the healthy section.

In this case, there are two types of division points based on the system configuration,
One type has a switch at a dividing point that is normally closed, and the other one has a switch that is normally open. The former is mainly used to isolate accident sections, and a forward or reverse accident investigation device is installed. The latter is used to transfer load from the accident section to the healthy section on the load side.
An accident investigation device for loop points will be installed. In addition, only the former is used for dendritic distribution systems, and both are used for loop distribution systems. In particular, accident investigation devices for loop points generally draw power from both sides of the switch, and the voltage drop on one side remains for a certain period of time. If this continues, a closing command will be given to the switch based on the AND condition with the simultaneous control signal from a distance, and this will allow load accommodation to the healthy section. However, in the event of a typhoon, lightning attack, etc., if there is a concern that the accident will spread if the fault point is re-energized, if an overload occurs due to the loop point switch being re-energized, or in the event of a fire, etc., an emergency stop of the feeder will be carried out. In this case, it is necessary to stop the switch closure command function for the loop point accident investigation device.

In this case, in order to reliably control a large number of loop point accident investigation devices, it is necessary to use high-voltage power distribution lines as transmission lines, superimpose lock and unlock signals on the carrier wave, and control them all at once from distant business offices. Common. Therefore, the loop point accident investigation device is provided with a simultaneous control receiving circuit in addition to the operation determining element circuit.

Incidentally, a loop point accident investigation device having such a function is mounted on a utility pole as shown in FIG. 1, and its maintenance and inspection have been carried out as follows. First, to describe the schematic configuration of each piece of equipment mounted on a pole as shown in Figure 1, 112, 21
2 is a high-voltage distribution line suspended from a telephone pole 28, and 21 is a section switch provided between the distribution lines 112 and 212, which is normally open. Further, 22 and 23 are power transformers with high voltage couplers whose primary sides are connected to the high voltage distribution lines 112 and 212, respectively, and 24 are power transformers with high voltage couplers whose secondary sides are connected via connection cables 25 and 26. This accident investigation device 24 is attached to a telephone pole 28 by a mounting band 29.

Loop point accident investigation device 2 in such a pillar-mounted state
To maintain and inspect 4, always use high voltage distribution line 11.
Even if voltage is applied to 2, 212, the sectional switch 21 remains open, so the loop point accident investigation device 24 is first
After removing the connecting cables 25 and 26 between the power transformer 22 and 23 and the power transformer 22 and 23 with the high voltage coupler, and then disconnecting the connecting cable 27 from the divisional switch 21, remove the mounting band 29 for attaching it to the utility pole 28 and loop it. The point-use accident investigation device 24 is lowered. The loop point accident investigation device 24 was then carried to a building with test equipment and tested, and then carried back to the original utility pole 28 and installed on it, and the connection cables 25, 26, and 27 were connected.

However, in this way, the loop point accident investigation device 24
In order to maintain and inspect the test equipment, it is necessary to remove and connect the connection cables 25 to 27, lower the loop point accident investigation device 24 to the pole, mount it on the pole, and transport it to and from the building where the testing equipment is located. Not only is maintenance and inspection time-consuming, but the work is also complex, and in particular, two or more workers are always required when lowering and reinstalling columns, resulting in high labor costs for maintenance and inspections, leading to inefficiency. It was spot on.

An object of the present invention is to eliminate the above-mentioned inconveniences and to provide a test device for accident investigation equipment that can be maintained and inspected by simple operations while the accident investigation equipment for loop points is mounted on a pole without having to be taken down from the pole. shall be.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a configuration example in which the device of the present invention is connected to a loop point accident investigation device for testing, and parts corresponding to those in FIG. 1 are given the same reference numerals for explanation. In FIG. 2, 112 and 212 are high voltage distribution lines, and these high voltage distribution lines 112 and 212
Sectional switch 2 that is open when in operation
Furthermore, the primary side of the power transformer 22 with a high voltage coupler is connected to the high voltage distribution line 112, and the primary side of the power transformer 23 with a high voltage coupler is connected to the high voltage distribution line 212, respectively. Power transformer with high voltage coupler 2
2 and 23 have a built-in transformer Tr, three-phase rectifier Rf, and high-voltage coupler Cp, and the output end of the three-phase rectifier Rf of the transformer with high-voltage coupler 22 is used to switch the power supply of the accident investigation device 24 for the loop point. At the input terminals t ₁ and t ₂ of the circuit section,
In addition, the three-phase rectifier of the power transformer 23 with high voltage coupler
The output ends of Rf are connected to the input ends t ₃ and t ₄ of the power switching circuit section of the loop point accident investigation device 24, respectively.
This loop point accident investigation device 24 is switch SW1
0, SW20, SW30, SW40, SW50, normally open contacts of diodes D ₁₁ , D ₁₂ and operation relay X ₂
It consists of a power supply switching circuit section consisting of X _2a , a simultaneous control receiving circuit section 15, an operation determination element circuit section 16, and an operation relay X ₂ energized by the operation output of this operation determination element circuit section 16. In the power supply switching circuit section, connect one end of the switch SW10 to the input terminal _t1
The other end is connected to the power input end (positive side) of the operation determination element circuit section 16 via the switch SW30. Further, one end of the switch 20 is connected to the input terminal _t3 , and the other end is connected to the power input terminal (positive side) of the operation determination element circuit section 16 via the switch SW40. Switch SW10 and SW3
_{The normally open contact _ 2a} , switch SW50
are connected in series to one terminal of the switch 21. Further, the input terminals t ₂ and t ₄ are connected to each other, and also connected to the other terminal of the section switch 21 and the power input terminal (minus side) of the operation determination element circuit section 16 . On the other hand, the output terminals of the high-voltage couplers Cp of the power transformers with high-voltage couplers 22 and 23 are connected to the input terminals of the simultaneous control receiving circuit section 15, respectively, and the operation determination element circuit section 16 side ends of the switches SW30 and SW40 are connected. Connect each to the power input terminal (positive side), and connect the input terminal _t4 to the power input terminal (minus side). Further, the output terminal of the simultaneous control receiving circuit section 15 is connected to the input terminal of the operation determination element circuit section 16.

In the loop point accident investigation device 24 having such a configuration, the test terminals A to K are respectively derived as follows. That is, input terminals t ₂ and t ₄ are connected to terminal A,
Connect the switch between SW20 and SW40 to terminal B, and connect the switch between SW10 and SW30 to terminal C.
The operation determination element circuit section 16 side end of SW40 is connected to terminal D.
, the operation determination element circuit section 16 of the switch SW30
Connect each side to terminal E. In addition, the test input terminals of the simultaneous control receiving circuit section 15 are connected to terminals F and G,
The test output end of the operation determination element circuit section 16 is connected to terminals H, I, and J, and the output end of operation relay _X2 is connected to terminal K, respectively.

On the other hand, 1 is a test device having terminals a to k corresponding to test terminals A to K led out to the loop point accident investigation device 24, and this test device 1 is installed on the ground and connected to a cable as shown in FIG. The connection is made by attaching the connector 3 to the test terminal section of the loop point accident investigation device 24 via the connector 2. In this case, the terminal of the loop point accident investigation device 24 and the tester 1
The terminals of each are A and a, B and b, C and c, D and d, E and e, F and f, G and g, H and h, I and i,
K and k are connected.

FIG. 3 shows in detail the internal configuration of the operation determining element circuit section 16 of the loop point accident investigation device 24. That is, in Fig. 3, OR21 is an OR circuit to which input signals are applied through switches SW30 and SW40, and AND21 is also an OR circuit.
An AND circuit to which input signals are applied through SW30 and SW40, IH21 is an inhibit circuit to which the output signal of the OR circuit OR21 is applied to one input terminal, and an output signal of the AND circuit AND21 to the other inhibit terminal, TX is an inhibit circuit. A closing timer circuit to which the output signal of IH21 is applied;
TZ is a confirmation timer circuit to which the output signal of the AND circuit AND21 is applied; M is a confirmation timer circuit to which the output signal of the closing timer circuit TX is applied to the set terminal S;
This is a storage circuit whose output signal is applied to the reset terminal R. Furthermore, AND22 is an AND circuit to which the output signal of the memory circuit M and the output signal of the inhibit circuit IH21 are added, and TH is an AND circuit AND2.
If a lock signal is input from the simultaneous control receiving circuit section 15 during the counting of the closing time, this holding time limit circuit TH will either leave the closing time incomplete or immediately change the output to "1". ”. Furthermore, NOT21 is a NOT circuit to which the output of the holding time limit circuit TH is applied.
AND23 is an AND circuit to which the output of this NOT circuit NOT21 and the lock solution signal from the simultaneous control receiving circuit section 15 are added, and AND24 is this AND circuit.
This is an AND circuit to which the output of AND23 and the output of memory circuit M are added, and the output signal of this AND circuit AND24 is applied to relay _X2 . Also, the output signal of the OR circuit OR21 is applied to this relay X ₂ via the normally open contact X _2-a2 of the relay X ₂ ,
I'm starting to be able to maintain myself.

FIG. 4 shows an example of the internal configuration of the tester 1 using a block circuit. In Fig. 4, terminals a to k are connected to the loop point accident investigation device 24 via the cable 2 mentioned above, and terminal c is connected via switch SW1 to a single power source, but it may be a dual power source. It is connected to the power supply discriminating circuit 6 for discriminating, and also to the terminal e. Also, switch terminal b to SW2
It is connected to the power supply discriminating circuit 6 through the terminal d and also to the terminal d. The anode side of the diode D1 is connected to the terminal c, and the anode side of the diode D2 is connected to the terminal b, and the cathode sides thereof are connected to the control power supply circuit 5 in common. Similarly, the cathode side of the diode D3 is connected to the terminal c, and the cathode side of the diode D4 is connected to the terminal b, respectively, and their anode sides are connected to the control power supply circuit 5 in common. This control power supply circuit 5 is connected to a terminal a of another OV line and an AC power outlet 4, respectively, so that a control power supply v of the internal circuit is outputted. The above power supply judgment circuit 6 includes switch SW1,
It determines whether it is a single power supply or a dual power supply depending on the presence or absence of a signal input through SW2, and as shown in the figure, transistors TR1, TR2, resistors R1 to R7, R9, NOR circuits NOR1, NOR2,
NAND circuit NAND1, NAND2, not circuit
NOT1, NOT2, NOT4, AND circuit AND
4. Consists of a changeover switch SW312. Connect push button switch PBS1 and
Connect one end of the normally closed contact of PBS2, and connect the other end of the normally closed contact to AND circuit AND1 and AND
Connect each to one input end of 2 separately. Further, the output terminal of the NOR circuit NOR2 of the power source determination circuit 6 is connected to the other input terminal of the AND circuits AND1 and AND2, respectively. Furthermore, this AND circuit AND1 and
The output terminal of AND2 is connected to the input terminal of the simultaneous control simulation circuit 13, the output terminal of this simultaneous control simulation circuit 13 is connected to the matching transformer 14, and the output terminal is connected to terminals f and g. The simultaneous control simulation circuit 13 is composed of a signal generation logic circuit 133, a lock modulation circuit 131, and a lock resolution modulation circuit 132. On the other hand, terminals h, i, j, and k are connected to the input terminals of the accident investigation device output determination circuit 8, and the output terminals thereof are connected to the function determination display section 9 and the counting circuit 10, respectively. The accident investigation device determination circuit 8 is a NOT circuit to which signals from terminals j and i are applied.
6. NOT7, NOT circuit NOT7 output and terminal h
NOR circuit NOR4 to which the signal from is added, AND circuit AND to which the output of NOT circuit NOT7 and the output of NOR circuit NOR2 of power supply determination circuit 6 are added
6. Output of NOT circuit NOT6, power supply judgment circuit 6
The output of the AND circuit AND4 and the NOT circuit NOT
AND circuit AND7 to which the output of 2 is added, the signal from terminal k and the not circuit of power supply determination circuit 6
It consists of an AND circuit AND8 to which the output of NOT4 is added. The counting circuit 10 has the outputs of the NOR circuit NOR4, AND circuits AND6 and AND7 of the accident investigation device output determination circuit 8 added thereto, and the output of the pulse generation circuit (for example, a crystal oscillator) 12. is connected to the count display section 11. Furthermore, the function judgment display section 9 shows the Noah circuit NOR4 of the accident investigation device 8, and the AND circuit AND.
The outputs of 6, AND7, and AND8 are respectively added. On the other hand, 7 in the figure is a counting circuit 10,
This is a return circuit that outputs a return signal "γ ₂ " to the count display section 11 and the function judgment display section 9, and this return circuit 7 is composed of a resistor R10 and a push button switch PBS3.

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 loop point accident investigation device 24 will be explained with reference to FIGS. 2 and 3. Now, in Fig. 2, when the handle position (not shown) of the loop point accident investigation device 24 during continuous operation is set to the automatic position, the switches SW10, SW20, SW30, SW
40, SW50 is closed. In this state, distribution line 1
When voltage is supplied to switches SW10 and 212, the power transformer with high voltage coupler 22 switches SW10,
A DC voltage is supplied from the high-voltage coupler-equipped power transformer 23 to the operation determination element circuit section 16 and the simultaneous control receiving circuit section 15 via the switches SW20 and SW40 via the SW30. Operation determination element circuit section 16
When a DC voltage is applied to the switch SW30 and SW40, the output of the OR circuit OR21 becomes "1" and at the same time the output of the AND circuit AND21 becomes "1". Therefore, the inhibit circuit
The output of IH21 is “0” and the closing timer circuit TX does not operate, but the output of the AND circuit AND21 is “1”
With this, the confirmation time limit circuit TZ starts counting the confirmation time limit. When the confirmation time limit circuit TZ finishes counting the predetermined confirmation time limit, the confirmation time limit circuit TZ outputs "1", resets the memory circuit M, and automatically releases the lock. This state is called a standby state, and during normal operation, the division switch 21 is open and the loop point accident investigation device 24 is in a standby state.

In this state, if there is an accident on the load-side high-voltage distribution line 212 side and this distribution line 212 remains without voltage, the switch SW40 side will have no voltage and the switch will
Since SW30 side has voltage, OR circuit
The output of OR21 remains "1", but the output of AND circuit AND21 changes from "1" to "0",
The output of the inhibit circuit IH21 changes from "0" to "1". Therefore, the closing time limit circuit TX starts counting the closing time limit. When the closing time limit circuit TX finishes counting the closing time after a certain predetermined time period, the memory circuit M is set. If the power supply on one side continues even after the count ends, the memory circuit M
The output of the AND circuit AND22 becomes "1" due to the set output signal "1" of the output signal "1" and the output "1" of the inhibit circuit IH21 under one-side power supply condition, and the holding time limit circuit TH counts the holding time limit. When the holding time limit count ends, the output of the holding time limit circuit TH becomes "1" and the output of the NOT circuit NOT21 is "0", so the output of the AND circuit AND23 continues to be in the "0" state. Therefore, the accident investigation device 16 becomes locked and does not accept input commands.

Sends a command to the accident investigation device 16 to switch to the division switch 2
1, it is sufficient to send a lock release signal to the transport control receiving circuit 15 of the accident investigation device 16 during the holding time limit. That is, the output of the input time limit circuit TX is "1" due to the termination of the input time limit count described above → the output of the memory circuit M is "1" → the transfer control receiving circuit 15 is locked while the retention time limit circuit TH is counting the retention time limit. When receiving the unlock signal, it outputs the lock unlock signal "1". Then, the holding time limit circuit TH does not complete counting → the output of the NOT circuit NOT21 becomes “1”
Under the AND condition, the AND circuit AND24 output is “1”
Therefore, relay _X2 operates. When this relay X ₂ operates, contact X _2-a1 closes and the distribution line 11
2 → Power transformer with high voltage coupler 22 → Switch SW
10 → Diode D ₁₁ → Contact X _2-a1 → Switch SW
The section switch 21 is closed through the path 50→section switch 21, and power is supplied to the load-side high-voltage distribution line 212. Note that contact X _2-a2 is also closed by the operation of relay X ₂ , and relay X ₂ is self-held by this contact.

To lock before the end of the holding time limit, send a lock signal to the transfer control receiving circuit 15, and
While TX is counting the closing time, leave the closing time in an incomplete state, or while the holding circuit TH is counting the holding time, immediately set the output of the holding circuit TH to “1” to send the lock release signal. However, relay _X2 does not operate and becomes locked.

The lock and lock release signals are transmitted from the distribution line 112 or 212 to the carrier control receiving circuit 15 via the coupler Cp.

The above description of the operation is based on the case where the power supply side distribution line 112 side has a power source and the load side distribution line 212 side has no power source, but the opposite case is exactly the same.

Next, the loop point accident investigation device 24 having the above-mentioned functions is installed in the above-mentioned always-operated section switch 2.
A case will be explained in which maintenance and inspection are carried out from the ground using the tester 1 while the tester 1 is in the open state and the tester 1 is mounted on the pole. First, when the handle position of the loop point accident investigation device 24 is set to the "test position", the switch SW1
0, SW20 remains closed, but the switch
SW30 and SW40 are opened, cutting off the power to the operation determination element circuit section 16 and the simultaneous control receiving circuit section 15. Further, since the switch SW50 is also opened, even if the contact X2 _-a1 is closed by the operation of the closing relay _X2 , no closing command is given to the switch 21. Next, the tester 1 is connected to the loop point accident investigation device 24 via the cable 2 and the connector 3, and test power is supplied to the operation determination element circuit section 16 and the simultaneous control receiving circuit section 15 via the tester 1. That is, when using the output of the power transformer with high voltage coupler 22 as the test power source, switch SW10 of the loop point accident investigation device 24 → terminal C → terminal c of the tester 1 → switch SW1 of the tester 1 → the tester Test power is supplied to the operation determination element circuit section 16 and the simultaneous control receiving circuit section 15 through the terminal e of the loop point accident investigation device 24. Note that the terminal A of the OV line is connected to the terminal a of the tester 1, making it common.

In addition, when the high voltage coupler uses the output of the power transformer 23 as the test power source, switch SW20 of the loop point accident investigation device 24 → terminal B → tester 1
terminal b → switch SW2 of tester 1 → tester 1
The test power is supplied to the operation determination element circuit section 16 and the simultaneous control receiving circuit section 15 through the terminal d of the loop point accident investigation device 24. On the other hand, in the tester 1, terminal c→diode D1 or terminal b→
Since the voltage is supplied to the control power supply circuit 5 via the diode D2, the control power supply circuit 5 steps down to an appropriate voltage and then outputs the control power supply v for each internal circuit and supplies it to each internal circuit. Incidentally, the pulse generating circuit 12 (shown in FIG. 4) generates a pulse output at the same time as the control power supply v is applied.

Next, with reference to FIG. 4, the operation of the tester 1 will be explained in detail with respect to typical functions, including the interaction with the output of the loop point accident investigation device 24 during testing and the relationship with the simultaneous control signal. First of all, switch
When SW1 and SW2 are closed almost simultaneously, the operation determination element circuit section 16 of the loop point accident investigation device 24 detects the presence of both voltages from terminals e and d, and checks the operation determination element circuit section 16. The timer of the time limit circuit TZ starts counting, and at the same time, the tester 1 is also connected to the distribution line 112 → power transformer with high voltage coupler 22 → switch SW10 → terminal C → terminal c → switch SW
The voltages of both power supplies are applied along the route 1 -> power supply discrimination circuit 6 or distribution line 212 -> power transformer with high voltage coupler 23 -> switch SW20 -> terminal B -> terminal b -> switch SW2 -> power supply discrimination circuit 6. In this state, the transistors TR1 and TR of the power supply discrimination circuit 6
Since both of 2 are turned on and the output is "0", the output of the NOR circuit NOR1 is "1" → the output of the NOT circuit NOT1 is "0" → via the switch SW312 2 → the output of the NOT circuit NOT2 is "1". On the other hand, since the output of the NOR circuit NOR1 is "1" → the output of the NOT circuit NOT4 is "0", the output of the NAND circuit NAND2 is "1" → the output of the AND circuit AND4 is "1". Further, the output of the NOR circuit NOR2 is "0".

Therefore, the output of the NOT circuit NOT2 is "1" and the output of the AND circuit AND4 is "1".
Since the confirmation time limit circuit TZ of the loop point accident investigation device 24 has not completed counting, the output of the terminal I is “0” → the input of the terminal i of the test device 1 is “0” → the NOT circuit NOT6 of the accident investigation device output judgment circuit 8 Since the output of is “1”, the AND circuit AND7
The output of becomes "1". Therefore, the AND circuit
When the output of AND7 becomes "1", the function determination display section 9 displays that the confirmation time is being counted, and the counting circuit 10 counts the confirmation time and displays it on the count display section 11. When the loop point accident investigation device 24 finishes counting the confirmation time limit, the confirmation time limit circuit of the operation determination element circuit section 16
The output of TZ becomes "1", the memory circuit M is reset, and the terminal I → terminal i becomes "1", and the not circuit of the accident investigation device output determination circuit 8 of the tester 1 is reset.
Since the output of NOT6 changes from "1" to "0", the output of AND circuit AND7 becomes "0". When the output of the AND circuit AND7 becomes "0", the function determination display section 9 determines that the confirmation time limit has ended, and at the same time displays this, the counting circuit 10 stops counting and displays the confirmation time limit on the count display section 11. .

Next, when the switch SW2 of the tester 1 is opened, the loop point accident investigation device 24 connects to the high voltage distribution line 21.
It becomes equivalent to the no-voltage state on the 2nd side, and the closing time circuit
TX starts counting the input time. On the other hand, in tester 1, voltage is present only in the path of distribution line 112 → power transformer with high voltage coupler 22 → switch SW10 → terminal C → terminal c → switch SW1 → power supply discrimination circuit 6, so transistor TR1 remains on and the output is not output. "0", the transistor TR2 turns off, the output changes from "0" to "1", the output of the NOR circuit NOR1 changes from "1" to "0", and the output of the NAND circuit NAND1 remains "1". Therefore, the NOT circuit NOT1
The output of NOT circuit NOT2 is "1" → "0", the output of NOT circuit NOT4 is "0" → "1", and the output of NAND circuit NAND2 is "1" → "0". ”, the output of the AND circuit AND4 changes from “0” to “1”, and the output of the NOR circuit NOR2 changes from “0” to “1”. Therefore, the output of the AND circuit AND7 of the accident investigation device output determination circuit 8 remains “0”, but the output of the NOR circuit NOR2 becomes “1” and the closing time limit circuit TX of the accident investigation device 24 is turned on. Since the time limit is not completed, the output of terminal J is “0”
→Since the input of the terminal j of the tester 1 is "0", →the output of the NOT circuit NOT7 of the accident investigation device output determination circuit 8 becomes "1". Therefore, the AND circuit AND6 outputs "1", and the function judgment display section 9 displays that the closing time is being counted due to the application of one power supply, and the counting circuit 10 counts the closing time, and the counting display section 11 indicates that the closing time is being counted. Perform display. When the closing time of the loop point accident investigation device 24 ends, the output of the closing time limit circuit TX changes from "0" to "1", and the terminal J→
The output of the NOT circuit NOT7 changes from "1" to "0" via the terminal j of the tester 1. NOT circuit NOT
When the output of the AND circuit AND6 becomes "0", the output of the AND circuit AND6 changes from "1" to "0", and the function judgment display section 9
determines that the input time period has ended and displays a message to that effect. At the same time, the loop point accident investigation device 24
starts counting the holding time limit in the holding time limit circuit TH, but in the tester 1 as well, the output of the NOT circuit NOT7 of the accident investigation device output judgment circuit 8 changes from "1" to "0". Then, the holding time limit of the holding time limit circuit TH of the loop point accident investigation device 24 is not completed, and the output of the terminal H is “0” → the terminal h of the test device 1 is also “0”
Therefore, the output of the NOR circuit NOR4 changes from “0” to “1”
becomes. When the output of the NOR circuit NOR4 becomes "1", the function determination display section 9 displays that the holding time limit is being counted, and the counting circuit 10 counts the holding time limit. When the holding time limit circuit TH of the loop point accident investigation device 24 ends its holding time, the output of the terminal H changes from “0” to “1”, and the terminal h of the test device 1 also changes from “0” to “1”. Therefore, the output of the NOR circuit NOR4 of the accident investigation device output judgment circuit 8 is “1”.
→ becomes “0”. As a result, the function judgment display section 9
determines that the holding time period has ended and displays that fact, stops the counting circuit 10, and displays the holding time period on the counting display section 11. Further, a lock indication due to the end of the holding time period is also displayed on the function determination display section 9. Here, in order to conduct a test in which relay X ₂ of the loop point accident investigation device 24 is turned on, if the aforementioned holding time limit circuit TH presses the push button switch PBS1 of the tester 1 during the holding time limit, the power supply discriminating circuit 6 is turned on. Output “1” of NOR circuit NOR2 and push button switch
Due to the AND condition with the logic value "1" due to the opening of PBS2, the output of the AND circuit AND2 becomes "1", and the signal generation logic circuit 133 of the carrier type simultaneous control simulation circuit section 13 drives the lock solution modulation circuit 132. A "lock release signal" is transmitted from terminal g via matching transformer 14. The loop point accident investigation device 24 receives this "lock release signal" at the terminal G, receives the "lock release signal" at the transport control signal receiving circuit 15, and then transmits the lock release signal to the operation determination element circuit section 16.
It outputs “1” to the AND circuit AND23,
The output of the holding time limit circuit TH is “0” → Not circuit
When the output of NOT21 is “1”, the AND circuit AND23
The AND condition is satisfied and the output becomes “1”,
Since the input time limit circuit TX has already finished counting the input time limit, the output of the memory circuit M is "1". Therefore, since the AND condition of the inputs of the AND circuit AND24 is satisfied, the relay _X2 is operated and the contacts X2 _-a1 and _X2-a2 are closed. In this case, relay X ₂ is self-maintained by closing its contacts X _2-a2 . In addition, even if contact X _2-a1 is closed, switch SW
12 is open, it does not affect the sectional switching path 21 in any way. Also, since the output of the AND circuit AND24 is "1", the terminal K is connected to the AND circuit of the accident investigation device output determination circuit 8 via the terminal k of the tester 1.
The input of AND8 becomes "1", and on the other hand, the other input of AND circuit AND8 becomes "1", and the output of NOT circuit NOT4 becomes "1" only under the condition that one power supply voltage is present in the test of the loop point accident investigation device 24 as described above. 1”, so
The AND circuit AND8 satisfies the AND condition and the output becomes "1", and the function judgment display section 9 indicates that the relay _X2
shows that it has worked. Also, if the push button switch PBS1 of the tester 1 is pressed while the closing time limit circuit TX of the loop point accident investigation device 24 is counting the closing time limit, or while the holding time limit counter of the holding time limit circuit TH is being counted,
When testing the loop point accident investigation device, the output of the NOR circuit NOR2 of the power supply discriminating circuit 6 is "1" under the single power supply condition, and the logic value "1" due to the opening of the push button switch PBS1 is ANDed. , the output of the AND circuit AND1 becomes "1", and the signal generation logic circuit 133 of the carrier type simultaneous control simulation circuit section 13
drives the lock modulation circuit 131, and a "lock signal" is transmitted from the terminal f via the matching transformer 14. Loop point accident investigation device 2
4 receives this "lock signal" at the terminal F, receives the "lock signal" at the transport control signal receiving circuit 15, and outputs the closing time circuit TX of the operation determination element circuit section 16.
and sends a command to the holding time limit circuit TH, which becomes the condition for relay _X2 to prevent closing. Note that the above-mentioned push button switch PBS2 is pressed and the signal is transmitted from the g terminal of the tester 1. The time of the "lock release signal" is longer than the time of input time + hold time by Δt time. When push button switch PBS1 is pressed, the "lock signal" sent from the f terminal of tester 1 is shorter than each of the closing time and holding time, so when each of the above signals disappears, the loop point accident investigation The container 24 returns to its original state. Also, “lock release signal”,
Even if there is no "lock signal" or no signal, relay _X2 does not operate as described above. In order to return the tester 1 after the test is completed, it is sufficient to press the push button switch PBS3 of the return circuit 7 and perform the return using the output "γ ₂ " of the return circuit 7. Loop point accident investigation device 2
In case 4, when both power supplies are present and the confirmation time limit circuit TZ completes the count of the confirmation time limit, it enters the normal operation state of the recovery state.

What has been explained above is the case where the loop point accident investigation device 24 is tested while mounted on a pole, but when testing is performed inside a substation or the like before mounting on a pole, there is often no DC voltage source. Generally, there is AC voltage of commercial frequency. Therefore, when testing with an AC power source, when the AC power outlet 4 is plugged into the tester 1 shown in FIG. As a test power source, DC power is supplied through the path of diodes D3 and D4, switches SW1 and SW2, and terminals e and d. Furthermore, the control power supply v for the internal circuits is also appropriately stepped down and supplied to each internal circuit.

In addition, the test procedure is based on the loop point accident investigation device 24.
However, it is placed alone, and everything else is exactly the same as in the pillared state described above.

As is clear from the embodiments described above, in the present invention, the test terminals A to E, H to K are connected to the input and output terminals of the operation determination element circuit section 16 outside the loop point accident investigation device. And the test terminals F and G connected to the input terminal of the simultaneous control receiving circuit section 15 are respectively derived, and the power supply connection terminals a are respectively connected by cables in correspondence with these test terminals.
-c and connection terminals d to k, and after the operation determination element circuit unit 16 is disconnected from the control power supply by the switches SW30 and SW40 of the switch mechanism provided at the input stage of the operation determination element circuit unit 16, the power supply is disconnected. Switches SW1 and SW2 provided in the input circuit of the test power supply voltage taken in through the connection terminals a to c
By the switching operation, an inspection signal simulating the presence of voltage on both sides of the sectional switch or the presence of voltage on one side is given to the input terminal of the operation judgment element circuit section 16 via the corresponding connection terminals d and e and test terminals D and E. Inspection switch mechanism: When the command switches PBS1 and PBS2 are operated on the condition that an inspection signal simulating the presence of voltage on one side is input to the operation determination element circuit section 16 by operating this inspection switch mechanism, a simultaneous control simulation signal is generated. This simultaneous control simulation signal is transmitted to the corresponding connection terminals f, g and test terminals F,
The corresponding test terminals H to K are applied from the output terminals of the simultaneous control simulation circuit 13 and the operation determination element circuit section 16 to the input terminal of the simultaneous control receiving circuit section 15 via G.
and a tester equipped with a determination circuit 8 that determines the operating state of the operation determination element circuit unit 16 in response to the input of the inspection signal and the input of the simultaneous control simulation signal based on the output signals taken in through the connection terminals h to k. 1 is installed on the ground side.

Therefore, in the accident investigation test device having such a configuration, the loop point accident investigation device 24, which requires maintenance and inspection, is installed on the ground side on which the cable 2 is connected. By connecting the connector to a predetermined test terminal of the loop point accident investigation device 24 through the connector, the loop point accident investigation device 24 can be inspected while mounted on a pole without affecting the power distribution system in any way. . In particular, loop point accident investigation device 2
5 can be tested by simply applying an inspection signal and simultaneous control simulation signal by operating the inspection switch mechanism and command switch, which not only simplifies the effort required for inspection, but also greatly reduces the time required. Moreover, the cost required for maintenance and inspection can be significantly reduced.

[Brief explanation of drawings]

Fig. 1 is a diagram showing how the distribution line automation equipment is mounted on a pole, Fig. 2 is a circuit diagram showing an example of the connection configuration between the distribution line automation equipment and the testing device for applying the device of the present invention, and Fig. 3 The figure is a circuit diagram showing the internal structure of the distribution line automation equipment and the connection structure with the tester, and FIG. 4 is a block diagram showing the structure of the tester in one embodiment of the present invention. 112, 212... High voltage distribution line, 21... Sectional switch for loop points, 24... Accident investigation device for loop points, 15... Simultaneous control receiving circuit section, 16... Operation determination element circuit section, SW10 to SW50 ...Switch, 1...Test device, 2...Cable, 3...Connector, 4...Connector for AC power supply, 5...Control power supply circuit, 6...Single power supply discrimination circuit, 7...Double power supply discrimination circuit , 8... Accident investigation device output judgment circuit, 9...
Function judgment display section, 10... Counting circuit, 11... Counting display section, 12... Pulse generation circuit, 13... Simultaneous control simulation circuit, 14... Matching transformer,
SW1, SW2...Switch.

Claims (1)

[Scope of Claims] 1. Simultaneous control that is provided corresponding to normally open sectional switches located at loop points of the distribution line and that receives lock or lock solution control signals transmitted from a distant electrical station. The receiving circuit determines whether there is voltage on the distribution lines on both sides of the sectional switch, and if it is determined that there is voltage only on one side of the distribution line, the condition has passed the scheduled time period and the lock is released by the simultaneous control receiving circuit. an operation determination element circuit section that issues a closing command to the section switch on the condition that a control signal of the section switch is received; provided at the input stage of this operation determination element circuit section, and normally controlled by the distribution lines on both sides of the section switch; In a test device for a loop point accident investigation device, the test device is provided with a switch mechanism for obtaining a power source, connecting the control power source to the operation determining element circuit section, and disconnecting the operation determining element circuit section from the control power source during testing,
Test terminals connected to the input and output terminals of the operation determination element circuit section and test terminals connected to the input terminal of the simultaneous control receiving circuit section are led out from the accident investigation device, and It has connection terminals that are respectively connected by cables in correspondence with the terminals, and a power supply connection terminal that is connected to a test power supply, and after the operation determination element circuit section is disconnected from the control power supply by the switch mechanism, the power supply connection terminal By switching the input circuit of the test power supply voltage taken in through the input circuit, the corresponding connection is sent to the input terminal of the operation determination element circuit section as an inspection signal simulating the presence of voltage on both sides of the sectional switch or the presence of voltage on one side. An inspection switch mechanism is provided through the terminal and the test terminal, and the command switch is operated on the condition that an inspection signal simulating the presence of voltage on one side is input to the operation determination element circuit section by operating this inspection switch mechanism. Then, a simultaneous control simulation signal is generated, and this simultaneous control simulation signal is applied to the input terminal of the simultaneous control receiving circuit section through the corresponding connection terminal and test terminal. Judgment for determining the operating state of the operation judgment element circuit unit in response to input of an inspection signal and input of a simultaneous control simulation signal based on output signals taken in from the output terminal through the corresponding test terminal and the connection terminal. A test device equipped with a circuit is installed on the ground side, and each connection terminal on the test device side is connected to a test terminal on the accident investigation device side via a connector to test the loop point accident investigation device. A test device for accident investigation equipment, which is characterized by: 2. The test device for accident investigation device according to claim 1, wherein the power source for testing is obtained from the distribution lines on both sides of the sectional switch via the switch mechanism of the loop point accident investigation device.