JPH0246131A - Distribution system controller - Google Patents

Abstract

PURPOSE:To shorten power interruption interval by communicating information each other and detecting faulty section independently through each pole controller then opening each switchgear and preventing closing thereof upon judgement that the section adjoining to the switchgear is faulty. CONSTITUTION:Assuming that shortcircuit fault occurs in section 3, a switchgear controller 3a detects the shortcircuit fault and transmits fault information to an adjoining switchgear controller 3b. A switchgear controller 3c which does not detect fault receives the fault information from the switchgear controller 3b and informs that it is not detecting a fault to the switchgear controller 3b. The switchgear controllers 3b, 3c open the switchgears 2b, 2c immediately through the logic circuit shown on the drawing thus completing separation of the faulty section 3 instantaneously. By such arrangement, ground fault section or shortcircuit fault section can be separated without interrupting power in the sound section at the source side of the faulty section.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a power distribution system control device for isolating a faulty section in a power distribution line.

(Prior art) Fig. 8 is a diagram explaining the conventional accident section separation method that adopts the time-limited accident investigation method. Fig. 8 (a) is a power distribution system diagram, and Fig. 8 (b) is an open/close diagram. It is a timing chart which shows the timing of the separation of a container. As shown in the figure, the distribution line from the distribution substation is divided into a plurality of sections by a feeder breaker (FCB) 1 and each switch 2. Each switch uses a constantly energized no-voltage open type automatically operated type switch, and numeral 3 is a pole-mounted control device for each switch position.

Consider a case where an accident occurs in the section between switches 2b and 2c in the distribution line having the above configuration. In this case, when an accident occurs, the substation's protection relay operates first, and the circuit breaker 1a trips. Therefore, there is a power outage on the distribution line, and each switch 2a, 2b, 2c is opened without voltage. After that, the reclosing relay at the substation operates for the purpose of detecting the fault section, and when the circuit breaker 1a is turned on, the pole-mounted control device 3a, which has detected charging on the power supply side, clocks the closing time (X time). , turn on the switch 2a. Next, do the same movement on the pillar 1ti.
'J control device 3b performs this, and switch 2b is closed. Since the closing of the switch 2b charged the accident section, the circuit breaker 1a trips again. At this time, the pole control device 3b that issued the closing command to the switch 2b clocks a detection time limit (time from charging to tripping), and if the time is within a predetermined time (Y time limit). If so, it is determined that this section is an accident section. Therefore, when power is transmitted again, no closing signal is given to the switch (the switch that detected the accident section), and the open state is maintained. According to such a conventional method, it is necessary to delay the power outage and retransmission, resulting in a power outage in the power supply side section rather than the accident section.

(Problems to be Solved by the Invention) According to the above-described conventional method, a total of two power outages are required to separate the accident section: the first power outage at the time of detecting the occurrence of an accident and the power outage at the time of detecting the accident section. In other words, in order to disconnect the faulty section, a power outage must be performed in the healthy section on the power supply side from the faulty section, and reverse power transfer from the faulty section to the healthy section on the load side must be carried out after the faulty section has been disconnected. Either way, this will result in a long power outage.

The present invention was made in response to the above-mentioned circumstances, and an object of the present invention is to provide a power distribution system control device that makes it possible to reduce power outage time.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention includes a plurality of pole switches that divide the distribution line into sections, and a plurality of pole switches that are provided corresponding to each of the pole switches. In a distribution system control system consisting of pole-mounted control equipment, each pole-mounted The control device independently detects the accident section, and when it is determined that the accident section is an area adjacent to the switch concerned, the control device controls each switch to turn off and prevent the switch from closing.

(Function) The pole-mounted control device detects ground faults and short circuits that occur on distribution lines, and sends the detected accident information to I! via the signal transmission line. Provided for pole-mounted control equipment connected to JL. Each pole-mounted control device determines that the power supply side section or load-side section divided by the relevant switch is the accident section based on the accident information detected by itself and the accident information sent from the adjacent pole-mounted control device. If this happens, turn off the switch.

(Example) Examples will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of an embodiment of a power distribution system control device according to the present invention. In Figure 1, l is a substation feeder breaker, 2 is a constantly energized voltage-free open switch, and 3 is a pole-mounted control device for controlling the switch, which controls the excitation power to the switch. Closing relay part 3-2. Accident detection unit 3-1 that detects ground fault and short circuit accidents. Power supply selection, power supply to various boards, and charging to enable operation during power outages! Power supply unit 3-5. 14Pt1 section 3-3 for inputting and outputting various information and making decisions. It consists of MODEH3-4 for transmitting and receiving signals with each pole-mounted control device. Further, 4 is a communication line for transmitting and receiving information for each pole-mounted control device, and 5 is a sensor for taking in the voltage and current of the line.

FIG. 2 shows a logic circuit for determining switch control based on an accident determination performed by the Hpu section 3-3 of the pole-mounted control device 3.

FIG. 2(a) shows the logic circuit in the case of a ground fault, and FIG. 2(b) shows the logic circuit in the case of the '@ fault. First, in the case of a ground fault, the information reception 21 of the load side section ground fault detection of the power supply side pole-mounted control device is input to one side of the AND circuit 28, and furthermore, the power supply section ground fault detection 22 of the in-house control device is input to the OR. circuit 26
When inputting to the other side of the AND circuit 28 via the
When input to the other side of the AND circuit 28 via the NOT circuit 27, the control 30 operates to cut off the breaker through the OR circuit 29, respectively. In addition, in the in-house control device, the load side section ground fault detection 23 is input to one of the AND circuits 32, and the load side section ground fault detection 24 of the load side pole control device or the load side section ground fault detection 24 of the load side pole control device is input to one side of the AND circuit 32. When either of the information reception 25 in which no side ground fault is detected is inputted to the other of the AND circuit N132 via the OR circuit 31, the switch is controlled to be turned off via the OR circuit 29 in the same manner as described above. As a result, the switches on both sides of the section where the ground fault has occurred are opened, and the section where the ground fault has occurred is instantly separated.

Next, a short circuit accident will be explained. In this case, the AND circuit 35 detects a short circuit accident in the usuki top control device and receives information 34 from the load side pole top control device that no load side ground fault is detected.
When the input is input to 36, the switch is cut off due to a power outage.
works.

FIG. 3 is a system diagram showing an example of a ground fault accident, and FIG. 4 is a diagram showing information collected in the pole control device in the case of a ground fault fault. Now, let us consider the case where a ground fault occurs in the section (■) of the power distribution system shown in Figure 3.

In this case, each pole control device 3a, 3b, 3c, 3
d detects a ground fault in the direction of the arrow in the figure. Further, each accident detection information is provided to the adjacent pole control device via the communication line 4. Information as shown in FIG. 4 is collected in each pole-mounted control device, and the pole-mounted control devices 3b and 3c respectively turn off the switches 2b and 2c using the logic circuit shown in FIG. 2(a). As a result, the accident section (3) is separated.

In addition, in the direction of ground fault detection in Figure 4, the meaning of "no change" or "not detected" indicated below the arrow means that in the case of a couple system, charging current often flows and can be detected, but in the case of an overhead system, This indicates that there may be cases where it cannot be detected.

FIG. 5 is a system diagram showing an example of a short circuit accident, and FIG. 6 is a diagram showing information collected in the pole control device in the case of a short circuit accident.

Consider the case where a short-circuit accident occurs in the section (■) of the power distribution section, similar to the case in FIG. 3 described above. In this case, the pole-mounted control device 3a that has detected the short-circuit accident transmits accident information to the adjacent pole-mounted control device 3b. Similarly, 3b transmits accident information to 3a and 3C. At this time, the pole control device 3C that has not detected an accident notifies the pole control device 3b that it has not detected an accident as soon as it receives the accident information from the pole control device 3b.

In this way, each pole-mounted control device collects information as shown in FIG. 6, and the pole-mounted control device 3b operates the substation short-circuit relay using the logic circuit shown in FIG. 2(b). hand,
When the feeder breaker is opened, the power is temporarily cut off,
When power is transmitted again, the switch is not turned on and remains open. According to the above embodiment, in the healthy section on the power supply side from the faulty section, in the case of a ground fault, it is possible to disconnect the faulty section without power outage, and in the case of a short circuit, it is possible to disconnect the faulty section at the first power outage.
It is possible to complete the separation of the accident section in just one trip.

FIG. 7 is a diagram explaining another embodiment at the time of a short circuit accident,
FIG. 7(a) is a diagram of a logic circuit, and FIG. 7(b) is a diagram showing information collected in the pole-mounted control device.

FIG. 7(a) will be explained. In this case, the short circuit accident detection 71 is input to one side of the AND circuit 73 in the mortar upper control device,
When the information reception 72 of short II @ accident end detection is input from the load-side pole-mounted control device to the other side of the AND circuit 73, the control 76 operates to cut off the breaker in question via the OR circuit 75.

Further, a negative input indicating that a short-circuit accident has been detected in the pole-mounted control device is input to one side of the AND circuit 74, and a negative input indicating that no short-circuit accident has been detected from the load-side pole-mounted control device is input to the AND circuit R7.
4, the switch is turned off via the OR circuit 75 in the same manner as described above.

Now, let us consider the case where a short circuit accident occurs in the section (■) shown in Fig. 5. The switch control device 3a that has detected the short-circuit accident transmits the accident information to the adjacent switch control device 3b. At this time, the switch control device 3C which has not detected an accident notifies the switch control device 3b that it has not detected an accident as soon as it receives the accident information from the switch control device 3b. In this way, the information shown in FIG. 7(b) is collected in each switch control device, and the logic circuit shown in FIG. 7(a)
The switch control devices 3b, 3c immediately control the switch 2b.
, 2c, and the accident section is instantly disconnected.

According to the above-described embodiment, it is possible to separate a fault section due to a ground fault or short circuit accident without powering out a healthy section on the power supply side from the fault section.

Although typical embodiments of the present invention have been described above, application to loop systems is also possible. In this case, all the pole-mounted control devices installed in the loose system can detect the direction of the ground fault point. For example, in the case of a ground fault, the pole-mounted llIn device that has detected the fault transmits fault information only to the pole-mounted control device in the direction in which the ground fault is detected. To put this into perspective in FIG. 4, the pole control device 3a transmits accident information to 3b, 3b transmits it to 3C, 3C transmits it to 3b, and 3d transmits it to 3C.

In this way, there is no need to include directionality in the accident information, and when information of ground fault detection is received from the adjacent pole-mounted control devices on both sides, it is sufficient to turn off the relevant switch.

[Effects of the Invention] As explained above, according to the present invention, when an accident occurs in the power distribution system, the switches at both ends of the power distribution system make a decision and shut off the accident, so the number of power outages can be reduced. It has become possible to reduce power outage time.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an embodiment of a power distribution system control device according to the present invention, Fig. 2 is a logic circuit side port for determining switch control contents, and Fig. 3 is a diagram for explaining the operation in the event of a ground fault. System diagram,
Figure 4 is a diagram showing the information collected in the pole-mounted control device in the case of Figure 3, Figure 5 is a system diagram to explain the action in the event of a short circuit accident, and Figure 6 is the case of Figure 5. FIG. 7 is a diagram illustrating the information collected in the pole control device in the example of FIG.
The figure is a diagram explaining a conventional method.

Claims (1)

[Claims] In a distribution system control device consisting of a plurality of pole switches that divide a distribution line into sections and a pole control device provided corresponding to each of the pole switches, a transmission path is provided between each pole control device. By setting up a system and mutually communicating accident information detected by its own pole-mounted control device, each pole-mounted control device independently detects the accident section and determines that the accident section is an adjacent section of the switch in question. A power distribution system control device characterized in that the respective switches are controlled to be turned off to prevent them from being turned on.