JP2677695B2 - Distribution line accident section separation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of use) The present invention relates to a distribution line accident section disconnection method for determining and disconnecting an accident section of a distribution line.

(Prior Art) FIG. 7 is a distribution system diagram, and a conventional system will be described using this.

1 is a substation, which has a circuit breaker 2 and each section switch 3,4,5
Sections A1 to A4 are divided by. There is a branch point P in the section A2 between the section switches 3 and 4, and the section switch 6 is connected to this branch point.

The conventional control device for the section switch has a timed closing function, a forward feeding closing lock and a reverse feeding closing lock function. The timed closing function detects the voltage at both ends of the sectional switch and, if there is voltage on only one side, turns on the sectional switch if the voltage is normal after the X time period voltage monitoring time.

The progressive feed lock function monitors the voltage across both terminals of the segment switch for the Y period, which is shorter than the X period after switching on the segment switch, and memorizes the prohibition of the progressive feed when a power failure occurs during the counting of the Y period. Until the sending prohibition is released, the timed closing of the sectional switch is locked. The reverse feed closing lock function stores the reverse feed prohibition when a power failure occurs during the X period, and thereafter locks the reverse feed close until the reverse feed close prohibition is released. Then, the control device 7 having the above-mentioned functions
-10 was attached to each section switch 3-6. However, it is necessary to prevent the X time periods of the respective control devices from overlapping each other when the power is simultaneously applied to the branch system at several places, and therefore the control device of the branch system can be set to n times.

The accident section separation method in this conventional control device will be described below.

For example, it is assumed that only the control device 10 is set for the 3 · X time period and the other control devices are set for the X time period. Each category switch 3
The operation of each of the section switches 3 to 6 in the case where an accident occurs in the section A3 in a state in which ~ 6 is in the supply state and is supplying electric power will be described based on the time chart in FIG.

First, the circuit breaker 2 of the substation 1 is opened due to the occurrence of an accident, and each of the sectional switches 3 to 6 is opened without a voltage, and then the circuit breaker 2 is reclosed. The control device 7 turns on the section switch 3 after the X time period because of the voltage on the power source side of the section switch 3. Subsequently, the voltage of the section A2 is applied to the control devices 8 and 10, but the control device 8 turns on the division switch 4 after the X time period, similarly to the control device 7. At this point, the control device 7 finishes the Y time period count, the control device 8 starts the Y time period count, the control device 9 starts the X time period count, and the control device 10 starts the 3.X time period count. is there.

The section switch 4 is turned on to re-energize the fault section A3, but the circuit breaker 2 of the substation 1 is reopened because the fault continues. Therefore, the control device 8 has a power failure during Y-time counting and stores the prohibition of progressive feeding. In addition, since the control devices 9 and 10 have a power failure during the X time period counting, they store the reverse feed prohibition.

After that, the circuit breaker 2 is turned on again, and the switch 3
Is turned on by the control device 7 after counting the X time period, and the division switch 6 is stored in the control device 10 by prohibiting the reverse feed.
Since it is a progressive supply from the power supply side, it is turned on after the 3 · X time count. The section switch 4 is a control device 8
It is not turned on due to the prohibition of sequential feeding.

Further, the section switch 5 is not turned on by the reverse feed prohibition memory of the control device 9 even if the section A4 is supplied with power from another system.

(Problems to be Solved by the Invention) As is clear from the above description, according to the conventional technique, the circuit breaker 2 of the substation 1 is opened and closed twice in order to disconnect the accident section A3. Become. That is, the accident section A3
In order to cut off, the healthy sections A1, A2 and A5 must be cut off twice.

The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide a distribution line accident section disconnection system that separates only an accident section and does not cause a power failure in a sound section on the power supply side of the accident section. .

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, a distribution line is divided by a plurality of division switches, and a control device is provided for each division switch to provide a distribution line. In the distribution line accident section disconnection method of disconnecting the accident section, the control device is a section corresponding to the control apparatus by a communication line different from the distribution line in the same manner as the section switch is connected by the distribution line. Communication means connected to each control device corresponding to the switch on the power supply side and the switch on the load side of the switch, and when an accident is detected, an accident detection signal is sent to the switch on the power supply side and the load side through the communication line. The transmission means for transmitting to each corresponding control device, and if there is no accident detection signal from the load side control device when the control device detects an accident, it is determined that an accident has occurred in the load side section and the relevant section switch Off control or It is judged that an accident has occurred in the section on the power supply side and the disconnection switch is turned off on the condition that there is a means to prohibit entry and the accident detection signal from the power supply side control device when the control device does not detect an accident. Alternatively, it is configured to include means for prohibiting the input.

(Operation) When an accident occurs, the controller that detected the accident sends a signal to the power supply side all together for a predetermined time. The control device that transmits this is each partition switch on the power supply side from the partition switch that includes the accident section. Next, after the elapse of the predetermined time, each of the control devices simultaneously sends a signal toward the load side for the predetermined time. At this time, the control device of each section switch that is not in the accident section can receive the signals in each of the above directions, but the control apparatus of the section switch that includes the accident section receives only the signal directed to the load side and sends it to the power supply side. It is possible to determine that it is the accident section because there is no signal received.

(Example) Hereinafter, an example is described with reference to drawings.

FIG. 1 is a configuration diagram of an embodiment for explaining a distribution line accident section disconnection method according to the present invention, and the same portions as those in FIG. 7 are designated by the same reference numerals. In addition to the conventional functions, the section switches 3 to 6 have means for detecting a distribution line accident on the side of the section switch load, and a communication terminal P1 for transmitting / receiving a signal to / from another control device on the side of the power supply on the distribution line. Control devices 11 to 14 each having a communication terminal P2 for transmitting and receiving a signal to and from another control device on the load side are attached. Each control device 11 ~
The 14 communication terminals P1 and P2 are branched and connected to each other by a pair of communication lines in the same manner as a distribution line. The control device
The communication terminal P1 of 11 is not connected because there is no corresponding control device.

 Next, the operation of the control device will be described.

Fig. 2 shows the operation of the controller that detected the accident,
The figure is a time chart for explaining the operation of the control device which has not detected an accident.

First, the control device which has detected the accident transmits the "accident detection" signal to the communication terminal P1 at the time T1 and at the same time receives the signal of the communication terminal P2. Next, "accident detection" for communication terminal P2 for T2 hours only
It transmits a signal and simultaneously receives a signal from the communication terminal P1.
Further, the control device which has not detected the accident, as shown in FIG. 3, is to receive the signal of the communication terminal P1 only for the time T2 after the time T1 by the "accident detection" signal of the communication terminal P1. Each control device independently determines the accident section depending on whether or not the signals of the communication terminals P1 and P2 are transmitted and received, and the division switches that divide the accident section are controlled to be turned off to prohibit the closing.

Therefore, since the control device located on the power supply side of the accident section can detect the accident, the control device that detected the accident can send and receive signals in the same direction all at once, and the control device that detects the accident can control itself by receiving the "accident detection" signal. It is possible to understand the status of the control devices located on the power supply side and the load side of the device, whether or not an accident has been detected.The self control device and the control device on the power supply side detect the accident, and the control device on the load side detects the accident. If not, it can be judged that an accident has occurred in the section on the load side that is divided by the self-switching switch. Since the control device 11 does not have a control device on the power supply side of its own control device, "the control device on the power supply side detects an accident" is not required as the judgment condition for the accident section.

In addition, if the control device that has not detected an accident receives the "accident detection" signal from the power supply side and does not receive the "accident detection" signal from the power supply side again within T2 hours after T1 time,
It can be determined that an accident has occurred in the section on the power supply side that is divided by its own switch.

Fig. 4 shows an example of the configuration of the control device. A ground fault direction relay DG that detects a load side ground fault accident, an overcurrent relay OC that detects a load side short circuit fault, and its own device on the distribution line via a communication line. The transmission section TC having the power supply side communication terminal P1 and the load side communication terminal P2 for transmitting and receiving signals to and from the control device of the section switch provided on the more power supply side and the load side, and the voltage of the distribution line at both ends of the section switch. Voltage detector VD that detects
It consists of a DG, an overcurrent relay OC, and a control processing unit CNT that controls the section switch by transmitting and receiving signals from the transmission unit TC. As a method of transmitting and receiving a signal through the communication line, for example, the contacts CX1 and CX2 as shown in FIG. 5 are used to operate the relays RY2 and RY1 on the receiving side to transmit and receive signals and perform DC transmission. .

The signal is transmitted from the control device which has detected the accident at the timing shown in FIG. 2 described above, and the signal is received at the timing shown in FIG. 2 or 3 described above. Further, as shown in the condition judgment pattern diagram of FIG. 6 described later, only when the control device that has detected the accident does not receive the “accident detected” signal at the load side communication terminal P2 (patterns 3 and 4), Controls the switching of the section switch, and
In the control device that did not detect an accident, only when there is no re-reception after receiving the “accident detection” signal transmitted at the timing T1 in FIG. Control is performed, and "prohibition of closing" is stored in the control processing unit CNT. After that, the automatic closing command is not issued to the section switch until the "closed prohibition" is released. The classification switch used in this embodiment is turned on / off according to a signal from the control device, and other items are not particularly specified.

 Next, the condition determination pattern of FIG. 6 will be described.

In pattern 1, there is no control device facing the power supply side of the own control device, and when the control device that has detected an accident receives the "accident detection" signal from the load side, the state of the classification switch is continued.

In pattern 2, when the control device that has detected an accident receives the "accident detection" signal from the power supply side and the load side, the state of the classification switch is continued.

Pattern 3 is the same as pattern 1 in that there is no control device facing the power supply side of the self control device, and the control device that detected the accident turns off the section switch when the "accident detection" signal from the load side is received. To do.

Pattern 4 is a control device which has detected an accident, and in the case where there is an "accident detection" signal from the power supply side and no "accident detection" signal from the load side, the division switch is turned off and controlled.

Pattern 5 is a control device that has not detected an accident, but there is an "accident detection" signal from the power supply side, and
When there is no re-reception of the "accident detection" signal on the power supply side at T2 time, the relevant section switch is turned off and controlled.

Pattern 6 is a control unit that has not detected an accident, and there is an "accident detection" signal from the power supply side,
If the "accident detection" signal on the power supply side is received again during T2, the status of the relevant section switch is maintained.

In pattern 7, in the control device which has not detected an accident, when there is no "accident detected" signal from the power supply side, the classification switch is kept in the state.

In FIG. 6, patterns 1 and 3 are when the control device facing the power supply side does not exist, and (Yes) is transmitted at the timing of T2 time on the transmission side, but is received on the reception side for T1 time. When the judgment is made, the-mark indicates that it is not related to the judgment condition.

 Next, the operation will be described.

It is assumed that the section switches 3 to 6 shown in FIGS. 1, 5, and 6 are in a closed state and that power is being supplied from the substation 1. If a short circuit accident occurs in section A3 in this state,
The control devices 11 and 12 detect the accident by the overcurrent relay OC,
Since the control devices 13 and 14 are accidents on the power supply side, no accident is detected.

The control devices 11 and 12 that detected the accident are the contacts CX of the communication terminal P1.
Closes 1 for T1 time and outputs an "accident detection" signal, and at the same time monitors the presence or absence of a signal at communication terminal P2. The control device 11 uses the signal from the communication terminal P1 of the control device 12 to communicate with the communication terminal P2.
The relay RY2 of 1 operates to determine that an accident has occurred in the load side section of the division switch 4 including the load side section A3. Since there is no signal from the control device 13, the control device 12 determines that there is an accident in the load side section A3 of the sectional switch 4. Control device 14
Since the relay RY1 of the communication terminal P1 receives the signal of the control device 12, it is determined that an accident has occurred in the power supply side system of the division switch 6.

Next, the control devices 11 and 12 stop the transmission signal of the communication terminal P1,
"Accident detection" by closing contact CX2 of communication terminal P2 for T2 time
At the same time as outputting a signal, the presence or absence of a signal at the communication terminal P1 is monitored.

Since the communication terminal P1 is not connected to the control device 11, the control device 11 determines that no accident has occurred at both ends from the partition switch 3 and continues the partition switch status (operation of pattern 1 in FIG. 6).

The control device 12 receives the signal from the control device 11 at the communication terminal P1 and determines that the accident in the load side section A3 of the classification switch 4 within the previous T1 time. The control is performed to store the closing prohibition, and thereafter, the section switch 4 is not automatically closed until the "closing prohibition" is released (operation of pattern 4 in FIG. 6).

The controller 13 receives the signal from the controller 12 at the communication terminal P1 and determines that an accident has occurred in the power supply side system from the division switch 5, and after the elapse of T1 time, again monitors the presence or absence of a signal at the communication terminal P1 for T2 time. To do. In this case, since no signal is received during the monitoring of T2 time, it is determined that an accident has occurred in the section A3 on the power supply side of the division switch 5, and the division switch 5 is turned off to store "prohibition". After that, the division switch 5 is not automatically closed until the prohibition of closing is released (operation of pattern 5 in FIG. 6).

The control device 14 is connected to the communication terminal P1 during the monitoring of T2 time.
Since the signal from 11 is received, it is determined that there is an accident in the power supply side branch system, and the section switch is maintained in the state (operation of pattern 6 in FIG. 6).

Note that the classification switch 5 is not turned on even if power is supplied from the load side due to the turning-on prohibition memory of the control device 13.

Further, even if an accident occurs in the section A2 in the system of FIG. 1, the control device 11 performs the operation of the pattern 3 of FIG. 6 by the exchange of the signals as described above, and the control devices 12 and 14 of FIG. The operation of pattern 5 is performed, and the control device 13 performs the operation of pattern 7 in FIG. Accident section A2
Is excluded from the system by opening the section switches 3, 4, and 6.
In this case, the classification switch 5 is always energized, so that it is opened when the system power supply is lost, but when power is supplied from the load side section A4, it is automatically turned on by the timed closing function of the conventional function of the control device 13. Then, power is supplied to the section A3. Since the control device 12 stores the prohibition of turning on, the section A3
Even if the voltage of is detected, it is not automatically turned on.

As described above, according to the present embodiment, only the accident section is separated, and a high-quality power supply that does not cause a power failure in the sound section on the power supply side of the accident section can be performed, and at the same time, each device of the system You can reduce the stress that is applied to your body.

 Other examples are listed below.

In this embodiment, the same effect can be obtained even if the signal is transferred by the communication line by a method other than the DC transmission.

The timing of signal transfer via the communication line is not limited to those shown in FIGS. 2 and 3, and for example, the relationship between T1 time and T2 time may be T1 = T2 or T1 ≠ T2.

Two-to-one communication line for transmitting and receiving signals between control devices
One pair may be used for transmission to the power supply side (reception from the load side) and the other pair may be used for reception from the power supply side (transmission to the load side).

The order of signal transmission / reception via a communication line may be such that the load side is transmitted first, the power source side is received, then the power source side is transmitted, and the load side is received.

In the above-mentioned embodiment, the description has been made in the form of adding the conventional function (time-closing function and the like) to each control device, but this is for supplying power to a healthy section other than the accident section, so another method, For example, the switch may be replaced by a distant control device such as a switch for a distribution line.

In the above embodiment, when the system fault occurs, the section switch of the fault section is controlled to be turned off to eliminate the fault section. The following operation may be performed after determining the short-circuit fault section by exchanging signals through the communication line.

Each control device that has determined the faulty section performs a disconnection control to the switch, but at this time, only the power supply side control device in the short circuiting fault section does not perform the disconnection control on the condition that the overcurrent relay is working. `` Prohibition '' only is stored, the section switch is opened after the voltage of the grid is removed by tripping the circuit breaker on the substation side, and when the circuit breaker at the substation is turned on again, The conventional timed closing function is used to sequentially turn on the power, and the controller on the power supply side in the accident section is configured so that it will not be turned on for a while due to the above-mentioned "prohibition of turning on". In this case, due to the disconnection of the accident section, one power failure occurs in the healthy section on the power supply side due to tripping of the circuit breaker on the substation side. However, compared to the conventional two power failures, high-quality power can be supplied, and The desired effect is obtained.

[Effects of the Invention] As described above, according to the present invention, a control device having communication means is provided for each section switch, and when an accident occurs, the control devices mutually send and receive signals to identify the accident section. As a result, it is possible to classify the faulty section into a healthy section on the power supply side without a power failure.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment for explaining a distribution line accident section disconnection system according to the present invention, FIG. 2 is a time chart for explaining the operation of a control device that has detected an accident, and FIG. 3 is no accident detected. Time chart explaining the operation of the control device, No. 4
FIG. 5 is a diagram showing a configuration example of a control device, FIG. 5 is a diagram showing a configuration example of a control device transmission section, FIG. 6 is a pattern diagram of condition determination of the control device, FIG. The figure is a time chart showing conventional operation timing. 1 ... Substation, 2 ... Breaker 3-6 ... Sectional switch, 11-14 ... Control device A1-A5 ... Section, P1, P2 ... Communication terminals

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Oikawa 3-7-1, Ichibancho, Aoba-ku, Sendai City, Miyagi Prefecture Tohoku Electric Power Co., Inc. (72) Inventor Kei Ishiguro 1 Toshiba Town, Fuchu-shi, Tokyo Company Toshiba Fuchu Factory (72) Inventor Kazutoyo Narita 1 Toshiba Town Fuchu, Tokyo Fuchu Factory Co., Ltd. (72) Inventor Masahide Susuda 1 Tokyo Fuchu City Toshiba Town Co., Ltd. 72) Inventor Toru Tsukada 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Headquarters Office (72) Inventor Atsushi Fujisawa 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Headquarters Office ( 56) References JP-A-1-136528 (JP, A)

Claims (3)

(57) [Claims] 1. A distribution line is divided by a plurality of division switches,
A control device is provided for each classification switch,
In the distribution line accident section disconnection method of separating the accident section of the distribution line, the control device corresponds to the control device by a communication line different from the distribution line in the same manner as the division switch is connected by the distribution line. The communication means connected to each control device corresponding to the power supply side and load side switch of the classification switch, and when an accident is detected, an accident detection signal is sent through the communication line to the power supply side and the load side of the classification switch. The transmission means to transmit to each control device corresponding to the container and the condition that the load side section determines that an accident has occurred and that there is no accident detection signal from the load side control device when the control device detects an accident It is determined that an accident has occurred in the compartment on the power supply side on the condition that there is a means for controlling the switch to be turned off or forbidden, and that there is an accident detection signal from the power supply-side control device when the control device does not detect an accident. Sort switch If there is a branch point in the power supply side section of the control device and the means for prohibiting control or closing, on the condition that there are multiple accident detection signals from the power supply side control device when the control device does not detect an accident. A distribution line accident section disconnection method, comprising means for judging that no accident has occurred in the section on the power supply side and maintaining the state of the relevant section switch. 2. A pair of communication lines connecting the respective control devices, one pair for transmitting to the power source side (for receiving to the load side) and another pair for receiving from the power source side ( (For sending to the load side)
The distribution line accident section disconnection method according to claim 1, wherein: 3. The transmitting means first transmits an accident detection signal to a control device corresponding to one of the power switch side and the load side switch when an accident is detected, and after a predetermined time, the other switch. 3. The distribution line accident section disconnection system according to claim 1 or 2, wherein an accident detection signal is transmitted to a control device corresponding to.