JPH034125Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a faulty section for a power distribution line that detects and classifies faulty sections in synchronization with the re-closing time and re-closing time of a power substation in a high-voltage distribution line. The present invention relates to a detection sorting device.

[Prior art] In general, in high-voltage distribution lines, in order to minimize the range of power outage in the event of an accident, the distribution line is divided into multiple sections using switches, and the faulty section is automatically detected and disconnected. A section detection and classification device is provided,
In the event of an accident, only the faulty section is separated (divided).

A conventional fault section detection and classification device is comprised of a switch that classifies a distribution line, and a timed switch control device that detects the voltage of the distribution line and controls the switch.

In the fault section detection and classification device described above, the time-limited switch control device detects the voltage of the power distribution line from a transformer attached to the power distribution line. When power is retransmitted from the power supply substation to the power distribution line that was once out of power at the time of the accident, the time-limited control device in each section closes the switch after a certain closing time has elapsed from the time the voltage on the distribution line is detected. In this way, the power is turned on in order from the upper section closest to the power source for a fixed time period. When the faulty section is turned on, the power substation will cut off power transmission again. The time-limited switch control device of the fault detection division device on the power supply side of the fault section has a fixed detection time after the switch is turned on (from the time from when the fault section is turned on until the power substation re-shuts off the switch). When the voltage on the distribution line disappears within a period of 20 minutes (set for a slightly longer period of time), it is assumed that the section on the load side of the switch is faulty, and the switch is opened, preventing it from closing (opening the switch). lock). As a result, the failed section on the load side of the switch is disconnected, and power is transmitted to the healthy section by re-closing.

[Problems to be solved by the invention] In the above-mentioned conventional failure section detection and classification device, in order to restore the device to normal operation after it has been locked for detecting and classifying the failure section, it is necessary for a worker to lock the device. There was a problem in that it was necessary to go to the location where the failed section detection and classification device was installed (usually on a utility pole) and manually perform the recovery operation, which required a great deal of effort to recover the device.

One way to solve this problem is to transmit a return command signal from a distance that instructs the failed section detection and classification device to return, but this method requires additional expensive equipment. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a faulty section detection and classification device for power distribution lines that can automatically unlock the faulty section detection and classification device without installing expensive equipment.

[Means for Solving the Problems] As shown in FIGS. 1 and 2 showing an embodiment of the present invention, the present invention has a switch SS that separates distribution lines A to C, and a switch SS that divides the voltage of the distribution lines. When the predetermined closing time T1 has passed from the time of detection and voltage recovery, the switch SS
time-limited switch control that controls the switch to lock the switch SS in the open/closed state when the voltage on the distribution line is no longer detected within a certain detection time T2 from the time the switch SS is closed. In a fault section detection and classification device for a distribution line equipped with a device TC,
The lock can be automatically released.

Therefore, in the present invention, the time-limited switch control device TC detects the voltage of the distribution line and issues a closing command to close the switch SS when a predetermined closing time T1 has elapsed since the voltage was restored. signal
A closing command circuit 2 that outputs VT1, and a locking command circuit 4 that outputs a locking command signal Vq1 when the voltage on the distribution line is not detected for a predetermined time within a certain detection time T3 from when the closing command signal was generated.
Then, when the voltage of the power distribution line is detected for a predetermined time while the lock command signal is being generated, the lock command circuit is reset to stop outputting the lock command signal, and the lock command signal disappears. A lock release circuit 6 outputs a lock release command signal Vi4 when the voltage of the distribution line is not detected for a predetermined time in the state, and a lock release command signal and a closing command signal are output in a state where no lock command signal is generated. It also includes a switch closing circuit 5 that closes the switch when the occurrence of the problem occurs.

[Effect of the invention] As described above, when the lock release circuit is provided, the lock of the fault section detection and classification device can be released by operating the circuit breaker at the substation, re-closing the circuit, and then cutting off the power for a certain period of time. I can do it. Therefore, it is possible to unlock the device without going to the site where the faulty section detection and classification device is installed.
Recovery work in the event of an accident can be simplified.

[Embodiments] Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention, and the fault section detection and classification device of this embodiment is composed of a switch unit U1 and a control unit U2 for controlling the switch. In Fig. 1, A to C are three-phase high-voltage distribution lines, and SS is a switch that separates the distribution lines. CC is a closing coil that closes the switch SS. When this closing coil is energized, the switch is kept closed, and when it is demagnetized, the switch is opened.

1 of the power transformer Tss between the 2 phases A and C of the distribution line
A rectifier Rec is connected to the secondary side of this power transformer via a power switch SW1. The output of the rectifier Rec is the relay described later.
It is applied to the closing coil CC through the contact Rya of Ry, and when the relay Ry is energized and the contact Rya is closed, the closing coil CC is energized and the switch SS is closed. The output of the power transformer Tss is also input to the line voltage detection transformer Tsd via the switch SW1, and the line voltage detection signal Vsl obtained from this transformer Tsd is input to the timed switch control device TC.

When the substation is reclosed after an accident and voltage is applied to the distribution line, the time-limited switch control device TC switches the relay Ry to Excite the coil to close the closing coil CC. In addition, if the substation shuts off again within a predetermined detection time from the time when relay Ry is energized, switch control device TC demagnetizes relay Ry and blocks its excitation to open switch SS. It is configured to lock into the state. In this example, the power switch
A switch control unit U2 is constituted by SW1, a rectifier Rec, a transformer Tsd, a timed switch control device TC, and a relay Ry.

As shown in FIG. 2, in this embodiment, the time-limited switch control device TC has a voltage detection circuit 1 that detects the presence or absence of voltage on the distribution line and outputs a voltage detection signal Vsv, and a voltage detection circuit 1 that outputs a voltage detection signal Vsv when the voltage is restored. from the predetermined input time T
A closing command circuit 2 outputs a closing command signal VT1 instructing to close the switch SS when 1 has elapsed, and a power outage detection signal VT2 is output when a certain period of time T2 has elapsed from the time when the voltage detection signal Vsv disappeared.
power failure detection circuit 3 that outputs
When the voltage detection signal Vsv disappears within a certain detection time T3 from when 1 occurs (when the voltage of the distribution line is no longer detected for a predetermined time), a lock command signal is generated.
When the lock command signal 4 outputs Vq1 and the voltage of the distribution line is detected for a predetermined time while the lock command signal Vq1 is being generated, the lock command circuit 4 is reset and the output of the lock command signal Vq1 is stopped. A lock release circuit 6 outputs a lock release command signal Vi4 when the voltage on the power distribution line is not detected for a predetermined time while the lock command signal disappears, and a lock release circuit 6 outputs the lock release command signal Vi4 when the lock command signal Vq1 is not generated. It is comprised of a switch closing circuit 5 that closes the switch SS when the lock release command signal Vi4 and the closing command signal VT1 are generated.

To explain in more detail, the voltage detection circuit 1 receives the line voltage detection signal output from the transformer Tsd shown in FIG.
This is a circuit that detects the presence or absence of voltage on the distribution line using Vsl as an input, and this voltage detection circuit outputs a signal Vsv whose logical value is "1" when there is voltage on the distribution line, as shown in Figure 3a. .

The closing command circuit 2 includes a first timer TM1, which receives the voltage detection signal Vsv as shown in FIG. A closing command signal VT1 whose logical value becomes "1" after a predetermined closing time T1 has elapsed from (the time when voltage is applied to the distribution line due to re-closing of the substation) is output. This power-on command signal VT1 is a signal when the voltage on the distribution line is lost.
It becomes "0" when the logical value of Vsv becomes "0".

The power failure detection circuit 3 consists of an inverter IN2 which receives the output of the voltage detection circuit 1 as an input, and a second timer TM2 which receives the output of this inverter as an input. As shown in FIG. 3d, the inverter IN2 outputs a signal Vi2 whose logical value is "1" when the logical value of the voltage detection signal Vsv is "0", and the second timer TM2 outputs a signal Vi2 whose logical value is "1", as shown in FIG. As shown in , the signal Vi2
A power outage detection signal whose logical value is "1" when a certain period of time T2 has elapsed (when the power outage continued for a certain period of time) after the logical value of becomes "1" (at the time of a power outage).
Output VT2.

The lock command circuit 4 includes a third timer TM3 which receives the input command signal VT1, an AND circuit AND1 which receives the output VT3 of the third timer and the power failure detection signal VT2, and the AND circuit AND1.
1 and a flip-flop circuit FF1 whose output Va1 is input to the set terminal s1. The logic value of the output signal VT3 of the third timer TM3 is the closing command signal as shown in FIG. 3c.
It becomes "1" at the same time as the logical value of VT1 becomes "1", and becomes "0" when a certain time period T3 has elapsed. Furthermore, as shown in FIG. 3f, the AND circuit AND1 has a logic value of "1" when the logic value of the power failure detection signal VT2 becomes "1" during the period when the logic value of the signal VT3 is "1". 1" signal Va1 is output, and the flip-flop circuit FF1 outputs this signal Va1.
It is set when Va1 becomes "1" and outputs the lock command signal Vq1 as shown in FIG. 3g.

The switch closing circuit 5 includes an inverter IN3 that negates the lock command signal Vq1, and an AND circuit AND2.
and an excitation circuit Ex that excites the coil of the relay Ry when the logical value of the output Va2 of the AND circuit AND2 becomes "1", and the AND circuit AND2 receives the closing command signal VT1 and the output signal of the inverter IN3. Vi3 and an output signal Vi4 of a lock release circuit 6, which will be described later, are input.

The lock release circuit 6 is specially provided in the present invention, and this circuit is used to lock the lock command signal Vq.
1 and voltage detection signal Vsv as inputs
AND3, a fourth timer TM4 whose input is the output of the AND circuit AND3, and this fourth timer TM
4 is input to the set terminal s2, and the power failure detection signal VT2 is input to the reset terminal r2, and an inverter IN4 receives the output Vq2 of the flip-flop circuit FF2 and outputs the lock release signal Vi4. ing. The output Vq2 of the flip-flop circuit FF2 is input to the reset terminal r1 of the flip-flop circuit FF1, and the output (lock release signal) Vi4 of the inverter IN4 is input to the AND circuit AND2 of the switch closing circuit 5.

As shown in FIG. 3i, the AND circuit AND3 outputs a signal Va3 whose logical value is "1" when both the logical value of the lock command signal Vq1 and the logical value of the voltage detection signal Vsv become "1". output and the fourth timer
TM4 receives the signal Va3 as shown in FIG. 3j.
A certain period of time T from the time when the logical value of becomes "1"
Signal VT4 whose logical value is "1" at the time when 4 has elapsed
Output. Flip-flop circuit FF2 is a signal
Since it is set when the logic value of VT4 becomes "1" and is reset by the power failure detection signal VT2, the logic value of the output Vq2 of the flip-flop circuit FF2 is equal to the logic value of the signal VT4, as shown in FIG. 3k. It becomes "1" at the same time as the value becomes "1", and becomes "0" at the same time as the logical value of the power failure detection signal VT2 becomes "1". The lock release signal Vi4 outputted from the inverter IN4 is as shown in FIG.
It becomes "1" while the output of flip-flop circuit FF2 is "0".

Next, the operation of the above embodiment will be explained. In the embodiment shown in FIGS. 1 and 2, during normal operation, the closing command signal VT1 is set to "1", and the flip-flop circuits FF1 and FF2 are reset, so that the signals Vi3 and Vi4 are both set to "1". It's summery. Therefore, the output Va2 of the AND circuit AND2 is "1", the coil of the relay Ry is energized, and the contact Rya shown in FIG. 1 is closed. Since the closing coil CC is energized at this time, the switch SS is held in the closed state, and power transmission is performed without any problem.

Once the power substation stops transmitting power in the event of an accident,
Since the output of transformer Tss disappears, the coil is turned on.
CC is demagnetized and switch SS opens. At this time, the output of the first timer TM1 in Fig. 2 becomes "0", the output of the AND circuit AND2 becomes "0", and a signal is supplied to the excitation circuit Ex, so that the relay Ry is demagnetized. , contact Rya opens.

Next, as shown in Figure 3, when the power substation recloses at time t1, the transformer Tss generates an output and the detection transformer Tsd outputs the line voltage detection signal Vsl, so the voltage detection in Figure 2 As shown in FIG. 3a, the circuit 1 outputs a detection signal Vsv having a logical value of "1" at time t1. As a result, the first timer TM1 starts a timed operation, and as shown in FIG.
As shown in , the time t2 when the preset closing time limit T1 has elapsed is the closing command signal whose logical value is "1".
Output Vt1. This closing command signal Vt1 is input to the AND circuit AND2, and since the output of the AND circuit becomes "1", the excitation circuit Ex excites the relay Ry at time t2 and closes the contact Rya. Therefore, the input coil is passed from the transformer Tss to the rectifier Rec.
Current is supplied to CC, and switch SS is closed at time t2.

Also, at time T2, the first timer TM1 ends its timed operation and the logic value of the closing command signal Vt1 becomes "1".
, the third timer TM3 starts a timed operation, and as shown in FIG. Output. This timer signal is input to the AND circuit AND1,
At this time, since the power failure detection signal VT2 has not yet been generated, the output of the AND circuit AND1 remains at "0".

Now, if the power substation detects an accident at time t3 before the third timer TM3 finishes its timed operation and stops power transmission again, the signal Vsv becomes "0".
Therefore, the output of the first timer TM1 is "0".
Then, the output of the AND circuit AND2 becomes "0" and the relay Ry is deenergized. Further, when the signal Vsv becomes "0" at time t3, the second timer TM2 starts a timed operation, and as shown in FIG. When the time-limited operation of timer TM2 ends, power failure detection signal VT2 becomes "1". As a result, the output of the AND circuit AND1 becomes "1" as shown in FIG. 3f, and the output (lock command signal) Vq of the flip-flop circuit FF1 becomes
1 becomes "1". At this time, the output of inverter IN3 becomes "0", so the next time the input command signal is
Even if VT1 becomes "1", the output of the AND circuit AND2 cannot become "1", and the switch
SS is locked open.

Next, when the power supply substation recloses the circuit at time t6 when a predetermined time has elapsed from time t5 when the timed operation of the third timer TM3 is completed, the power failure detection signal VT2 becomes "0", and the AND circuit AND3 The output becomes "1". Further, at time t7 when a certain period of time T1 has elapsed from time t6, the first timer TM1 is activated.
When the timed operation is completed, the first timer outputs the closing command signal VT1. Therefore, at time t7, the third timer TM3 starts a timed operation and outputs a signal VT3 whose logical value is "1". Furthermore, when the circuit is reclosed at time t6, the output Va3 of the AND circuit AND3 becomes "1", so the fourth timer TM
4 starts the timed operation, and when the timed operation of the fourth timer is completed at time t8 when a certain time period T4 has elapsed from time t6, the output of the fourth timer becomes "1". Therefore, at time t8, flip-flop circuit FF2 is set, and its output Vq2 becomes "1". Since this signal Vq2 is supplied to the reset terminal of the flip-flop circuit FF2, the flip-flop circuit FF1 is reset and the lock command signal Vq1 becomes "0". Therefore, the output Vi3 of the inverter IN3 becomes "1".

Next, at time t11, the power supply substation temporarily stops power transmission to release the lock. As a result, the second timer TM2 starts a timed operation, and at time t12 a certain time period T2 has elapsed from time t11.
When the timed operation of the second timer is completed, the power failure detection signal VT2 becomes "1". Power outage detection signal
When VT2 becomes “1”, flip-flop circuit FF
2 is reset, the output Vq2 of the flip-flop circuit FF2 becomes "0", and the inverter
The output of IN4 becomes "1".

Next, the power substation starts transmitting power again at time t13 to release the lock. This allows the first
The timer TM1 starts a timed operation, and at time t13
When the timed operation of the first timer TM1 is completed and the closing command signal VT1 becomes "1" at time t14 when a certain time period T1 has elapsed, the AND circuit
The output of AND2 becomes "1" and the excitation circuit Ex excites the relay Ry. This closes contact Rya,
Switch SS is turned on.

As described above, according to the present invention, by opening and closing the circuit breaker at the power substation, it is possible to unlock the fault section detection and classification device located at a remote location. Therefore, it is possible to unlock the fault section detection and classification device that is grounded at a location far from the substation without installing special equipment to send a command signal for unlocking, and it is possible to release the lock in the case of an accident. Recovery work can be made easier.

In the above embodiment, the first to third timers TM1 to TM3, inverters IN2, IN3,
The AND circuits AND1 to AND3 and the flip-flop circuits FF1, FF2, etc. may be constructed using electronic elements such as transistors and thyristors, or may be constructed using relays. Similarly relay
Ry can also be replaced by an electronic switch.

Furthermore, the logic circuits that make up each part of the timed switch control device TC are not limited to the above example.
Of course, it is also possible to use circuits with other logical configurations that perform the same functions as those of the above embodiments.

[Effects of the invention] As described above, according to the invention, since the time-limited switch control device is provided with an unlock circuit, it is possible to operate the circuit breaker at the substation to reclose the circuit and then cause a power outage for a certain period of time. By doing so, it is possible to release the lock of the fault section detection and classification device. Therefore, the device can be unlocked without going to the site where the faulty section detection and classification device is installed, and recovery work in the event of an accident can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the overall structure of an embodiment of the present invention, Fig. 2 is a block diagram showing the structure of a timed switch control device in the same embodiment, and Fig. 3 is a signal diagram of each part of Fig. 2. FIG. 3 is a waveform diagram showing waveforms. 1... Voltage detection circuit, 2... Closing command circuit, 3
...Power failure detection circuit, 4...Lock command circuit, 5...
...Switch closing circuit, 6...Lock release circuit, TC
...Timed switch control device.

Claims (1)

[Scope of Claim for Utility Model Registration] A switch that separates a distribution line; and a switch that detects the voltage of the distribution line and closes the switch when a predetermined closing time has elapsed from the time when the voltage is restored; and a time-limited switch control device for controlling the switch so as to lock the switch in an open state in the event of a power outage within a certain detection time period from the time of the power outage. The switch control device includes a closing command circuit that detects the voltage of the distribution line and outputs a closing command signal that instructs to close the switch when a predetermined closing time period has elapsed since voltage recovery; A lock command circuit outputs a lock command signal when a power outage is detected on the power distribution line within a certain period of time from the time when the power failure occurs; When the lock command signal is detected, a reset signal is supplied to the lock command circuit to stop the output of the lock command signal, and when a power outage of the power distribution line is detected while the lock command signal has disappeared, a lock release command is issued. The lock release circuit includes a lock release circuit that outputs a signal, and a switch closing circuit that closes the switch when the lock release command signal and the closing command signal are generated in a state where the lock command signal is not generated. A failure section detection and classification device for power distribution lines, characterized in that: