JPH0260422A - Faulty section detector/controller - Google Patents

Abstract

PURPOSE:To recover transmission of power through each sound section quickly by detecting a faulty section at a master section based on fault judging information held at each slave station and transmitting an unlock command to the slave station in each sound section upto the faulty section. CONSTITUTION:Upon occurrence of fault in the section #3 of a slave station 12c, fault information is transmitted through cables 13a, 13b to slave stations 12a, 12b and unlock commands are fed to switchgears 4a-4c. When a circuit breaker 2 is opened, the switchgear 4a is opened and unlocked to disable throw-in. When the circuit breaker 2 is reclosed through a master station 11, judging information held at the slave station 12a is transmitted to the master station 12 and it is recognized that the faulty section is not the section #1 of the slave station 12a. Consequently, the switchgear 4a is thrown in and transmission of power through the sound section #1 is recovered. Transmission of power through a sound section #2 is recovered similarly, but since the judging information at the slave station 12c exhibits existence of fault in its section #3 the switchgear 4c is kept in an unlocked state.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention detects accidents such as short circuits and ground faults in a high voltage distribution system divided by multiple sectional switches, and The present invention relates to an accident section detection control device for restoring power transmission in a healthy section.

[Conventional technology]

Conventionally, in high voltage distribution equipment, as shown in Figure 5,
The high-voltage distribution system (3) connected to the circuit breaker (2) at the secondary power transmission start end of the substation (1) has multiple sectional switches (4a)
t(4b), (4C), (4d), d Therefore, multiple sections (00)t(Jul)j($3.),(I4),・
..., and a switch (4a) is installed on the substation fl+ side.
) to perform status monitoring and remote control of circuit breakers (2
) control function, communication function, and monitoring function of the master station (5
) is provided at substation i11, and slave stations (6a) and (6b) are provided for each master station (5) and switch (4a).
).

(6C), (6d), . . . are connected via a common communication cable (8) having, for example, a cable (7a) and a down cable (7b).

The circuit breaker (2) is closed by manual operation or by the closing control of the master station (5), and when an accident occurs in the system (3), the fault detection device such as a protective relay in the substation (1) detects the fault. Automatically tripped open based on.

In addition, each slave station (6a) having the control function 9 communication function of the switch (4a) is connected to the substation of the switch (4a) unless reverse power is transmitted from another substation, etc. The 11 side is the power receiving side, and the transformers (9a) and (9b
).

It is driven by power from (9c), (9d), .

In addition, in special cases where the above-mentioned reverse power transmission is performed, the transformer (
Transformers (10a), (10b), (IOC), (10d), provided on the load side instead of the power supply of 9a) ~
Each slave station (6a) is driven by the power from .

Then, during normal times when power is transmitted from substation (1), each slave station (
6a) ~ When power starts to be supplied, each switch (4a) ~ is turned on by continuing power supply for a few seconds to confirm power reception, and at this time, unless the switch is locked open to prevent turning on, the switch (4a) ~ is closed. (4a) ~ is introduced and closed.

In addition, in order to detect the faulty section and restore power transmission through trial power transmission, which will be described later, each slave station (6a) ~ will be able to operate the switch (4a) if the power supply stops within a few seconds of power loss confirmation immediately after power is turned on.
) ~ are opened and locked to prohibit closing, and when the power supply is stopped in the closed state of the switch (4a) ~ after the expiration of the disappearance confirmation time, the switch (4a) ~ is immediately opened to shut off.

Therefore, when the circuit breaker (2) is closed due to the start of power transmission, power is supplied from the transformer (9a) to the switch (4a) based on the grid voltage on the receiving side of the switch (4a) to the circuit breaker (4a).
a) ~ are input in order, and each slave station (6a) ~'s own station section (
Power transmission to Rin1) is started in order.

Next, during power transmission, for example, section C'! When an accident occurs in #-3), the accident section is detected by the test power transmission described below, and power transmission in each healthy section is restored.

That is, if an accident occurs in the section (+3) at the time of to and the transmission current becomes an overcurrent, based on the detection by the accident detection device, the circuit breaker (2) is activated at 11 o'clock as shown in Figure 6 (a).
will open trip, power transmission will be stopped, and the first power outage will occur.

At this time, based on the open trip of the circuit breaker (2), the system voltage decreased to no voltage as shown in Figure 6 (b), and the power supply to each slave station (6a) was stopped, and from 11 o'clock a little The switches (4a) to are opened at the delayed time t1.

By the way, the circuit breaker (2) which has tripped open is turned on again at time t2 by re-turning on the trial power transmission of the master station (5) based on manual operation or timer control.

When the system voltage is restored based on the closing of the circuit breaker (2), the power supply to the slave station (6a) is first restarted and the switch (4a) is closed, and then the power supply to the slave station (6b) is restarted. is restarted, the switch (4b) is turned on, and the slave station (
6C) is restarted, and the switch (4C) is turned on at time t3 as shown in FIG. 6(C).

At this time, based on the closing of the switch (4C), the fault detection device detects the fault again, and the circuit breaker (2) is tripped open again at time t4, resulting in a second power outage state.

In addition, since the time from turning on the switch (4C) at 13:00 until the voltage drops to no voltage is shorter than the disappearance confirmation time Δt,
As shown in FIG. 6(d), the switch (4C) is opened and locked at time t4' within time Δ, and at this time, the accident area (
4+-3) is detected and separated.

Then, the circuit breaker (2) which has tripped open is closed again at 3:00 pm by the master station (5) repeatedly closing the circuit breaker (5) based on manual operation or timer control, and at this time, the circuit breakers (4a) and (4b) are turned on in order, but the switch (4C
) is prohibited from being turned on by the open lock, so it is kept open without being turned on, and power transmission is restored in the healthy sections (#0) to (#2) on the substation full side from the accident section (#3).

In addition, the master station (5) and each slave station (6) are connected via the cable (8).
a) Based on the exchange of information based on polling communication with ~ or based on the time until the open trip of the circuit breaker (2) during test power transmission, the master station (5) determines whether the substation tl
The accident section (#3) on the l side is also detected and notified, and restoration work for the accident section (#3) is carried out based on the notification.

After the restoration work is completed, the open lock of the switch (4C) is released manually or based on the remote control of the master station (5), and power transmission in the entire section is restored.

[Problem to be solved by the invention]

As mentioned above, when detecting fault sections through trial power transmission and restoring power transmission in each healthy section, power transmission is restored after the circuit breaker (2) is turned on again and again, as is clear from Fig. 6.
There is a problem in that it takes time from the occurrence of an accident to the restoration of power transmission in each healthy section due to two power outages, making it impossible to quickly restore power transmission in each healthy section.

An object of the present invention is to provide an accident section detection control device that detects an accident section without performing the conventional trial power transmission and quickly restores power transmission in each healthy section.

[Means to solve the problem]

In order to achieve the above object, in the fault section detection device of the present invention, a circuit breaker and a master station are provided at the substation at the transmission start end of a high-voltage distribution system, and are tripped when an accident occurs in the system, and are A slave station connected to the master station via a common communication cable and operated by a power source on the power receiving side of the switch is provided for each sectional switch of the system, and the load of the switch is connected to the slave station. a sensor means for detecting a fault current on the side; and a detection signal from the sensor means to open and lock the switch to prohibit closing, and release the lock from the master station via the communication cable after the circuit breaker is closed again. A switch control means that releases the open lock and closes the switch based on a command, and an accident that transmits the detection signal to the previous slave station as next station accident information via a dedicated accident detection cable. an information output means, gate-processing own-station accident information based on the detection signal and next-station accident information from the next slave station, and determining whether or not an accident has occurred in the own-station section immediately before power cutoff based on an accident; fault section discrimination means for outputting information; information holding means for holding the discrimination information by a mechanical latching relay; information transmission means for transmitting the discrimination information held in the means to the master station via the communication cable; a paging control means for calling stations in order from the one closest to the substation; and a paging control means for calling stations in order from the one closest to the substation; and each time the discrimination information is transmitted and input based on the paging, the called slave station identifies the presence or absence of an accident in the own section of the called slave station, and identifies the fault section. and a command output means for outputting the lock release command to the called slave station and outputting the calling command for the next slave station until the accident zone is detected. Technical measures are being taken.

[Effect]

In the case of the accident section detection control device configured as above,
When an accident occurs during power transmission, the sensor means of each slave station whose own station section is the section up to the accident section detects the fault current,
The switches in each section up to the accident section are opened and locked, and the detection signal of the sensor means is transmitted to the previous slave station as the next station accident information via the accident detection cable between the slave stations.

Furthermore, the own-station accident information based on the detection signal and the next-station accident information from the next slave station are gate-processed to determine whether the accident occurred in the own-station section or in a section on the load side from the own-station section. At the same time, immediately before the power supply to each slave station is cut off due to the circuit breaker open trip E, the information holding means determines whether an accident has occurred in the own station section. Mechanical latching relay set.

The relay is reset and the discrimination information is held in the relay.

Therefore, even if the circuit breaker trips open due to an accident and power is no longer supplied to each slave station, the discrimination information continues to be held in the information holding means.

When the open-tripped circuit breaker is re-closed, the master station's call control means calls each slave station in order from the one closest to the substation, and the master station's fault section detection means transmits and inputs The accident zone is detected from the discrimination information, and until the accident zone is detected, the transmission to the called slave station is performed based on the transmission of the unlock command of the command output means and the next slave station calling command. Transmission of the lock release command and calling of the next slave station are repeated.

Therefore, when a circuit breaker that has been tripped open due to an accident is turned on again, the fault section is detected without performing the conventional test transmission, and the release locks of the switches in each healthy section up to the fault section are released, and each healthy section is released. Power transmission in the area will be quickly restored.

〔Example〕

One embodiment will be described with reference to FIGS. 1 to 4.

In Figure 2, which shows the overall block when applied to a three-phase high-voltage distribution system, (0) is the master station installed in the substation;
(12a), (12b), (12c), (12d), -
, is a slave station provided for each switch (4a) to (13a)
, (13b), (13C), (13d), . = is the slave station (
4a) A dedicated accident detection cable installed between (
Sl) and (S2) are multiple CTs that detect the system current of the slave station (12a) ~each own station section (#υ~, 7.1
1i:'ic.

Incidentally, each of the slave stations (12a) and so on has the same configuration, and the main station (+1) and each of the slave stations (12a) and so on are provided with the respective parts shown in FIG.

In Figure 1, (14) is CT (Sl)t Z C
T (15) is a slave station fault detection section that forms a sensor means together with (S2), a switch control section that forms a switch control means, and controls the opening and closing of each switch (4a) to each other in the same manner as before. At the same time, each switch (4a) is opened and locked by the detection signal from the detection section (14). (16) is a detection information output section forming an accident information output means, which uses the detection signal of the detection section (I4) as the next station accident information through the cable (
13a) ~ Output to each.

07) is a gate part forming an accident section discrimination means,
Local station accident information based on the detection signal of the detection unit (14);
cable (13a) to the next slave station (
6b) Perform gate processing on the next station accident information transmitted and input from ~. (+81 is a storage section forming an information holding means, and consists of a mechanical latching relay that latches the output signal of the gate section (17).

(19) is a slave station modem unit connected to cables (7a) and (7b), (20) is a local station polling detection unit that detects a call from the local station, and (21) is an initial reset of the storage unit (18). (22) is a reading control unit that controls reading of the memory in the storage unit (18); (231 is a control unit; (24) is a memory reading unit that reads the state of the latching relay by controlling the two; is a slave station transmission processing section which encodes the information of the reading section (23) into transmission data and outputs it to the modem section (19).

(25) is the master station modem section connected to the cables (7a) and (7b), and 6) is the master station transmission/reception processing section connected to the modem section tXa, which encodes the transmitted information and decodes the received information. conduct. (27) is a polling generating section forming a call control means; exposed is a master station fault detecting section forming a fault section detecting means; (29) is a command generating section forming a command output means; (30) is a circuit breaker ( 2).

By the way, in normal times when power is transmitted from the substation (11), each slave station (12a) ~ is connected to the transformer (9a) on the receiving side of the switch (4a) ~, similar to each slave station (6a) ~ in Figure 5. It is driven by the power source of ~, and based on the current detection of CT (Sl) and ZCT (S2), the detection unit (14) monitors the fault current of the system current due to short circuit, ground fault, etc.

For example, if a fault occurs in the own station section (A3) of the slave station (12c), the grid current in the section (=ljO) to (Japan) changes to the fault current, and the grid current in the section (J) to (#3) changes to the fault current. Based on the detection of the fault current of the slave station (1) up to the fault section (#3),
A high level detection signal is immediately output from the detection units (14) of 2a) to (12c).

Also, based on the detection signal of the detection unit (I4), the slave station (1
2+)), from the output section (16) of (12c) to the cable (
13a), the previous slave station (12a) via (1,Th)
) and (12b), a high level signal of next station accident information is immediately transmitted to each of them.

Furthermore, the gate section of each slave station (12a) (from 1 old section,
The high-level signal of the own-station accident information based on the detection signal of the detection unit (14) and the inverted signal of the high-level signal of the next-station accident information transmitted and input via the cable (13a) are subjected to AND gate processing. Ru.

Therefore, the output signal of the gate section (17) (7) of the slave station (1:1)a), (12b) is similar to the output signal of the gate section (I7) after the slave station (12d), when a low-level accident occurs. Only the output signal of the gate section (I7) of the slave station (12c) serves as a high-level signal for determining whether an accident has occurred.

Then, based on the high-level discrimination information signal from the gate section 07), only the latching relay of the storage section (18) of the slave station (12c) is set.

On the other hand, based on the detection signal of the detection unit (14), the slave station (1
2a), the switch (4a) of the control section (15) of (12C)
) to (4c) each open lock is commanded.

By the way, the process from detecting the fault current to setting the latching relay is performed instantaneously determined by the transmission time of the fault detection cable and the operating time of the latching relay, and ends before the circuit breaker (2) is opened due to the fault. .

Then, when the circuit breaker (2) is tripped open and the system +31 is in a power outage state and the system voltage becomes no voltage, the circuit breaker (2)
4a) to 4C are opened, and at this time, based on the above-mentioned open lock command, the switches (4a) to (4C) are opened and locked to prohibit closing.

Further, the power supply from the transformer (9a) to each slave station (12a) is cut off, and the operation of each slave station (12a) is stopped.

By the way, even if the power supply to each slave station (12a) is cut off, the memory section (I8) of each slave station (12a) will be able to store the gate section (17) based on the setting and reset of the latching relay.
The discrimination information from is stored and retained.

Next, based on manual operation or timer control, for example, at a time corresponding to 12 o'clock in FIG. Based on the system voltage of substation il+, power is supplied to the first slave station (12a) closest to substation il+.

At this time, based on the open lock before the power outage, the switch (4
a) is locked, so the switch (4C
The moon is not invested.

On the other hand, when the circuit breaker (2) is re-closed, the generating part (29)
Based on the calling command, the slave station (12a)
A calling signal is output, and the calling signal is sent to the processing unit (2s
+ R mode, slave station (12) via cable (7b)
The signal is transmitted to the modem section (19) of (a), and the slave station (12a) is polled and called.

Then, in the slave station (12a), when the polling call signal is received and input to the detection unit (201) via the modem unit (19), it is read from the detection unit (20) via the control unit (22). The unit (23) is instructed to read the information held in the storage unit (I8).

At this time, the reading section (side) reads the state of the latching relay in the storage section (18) and outputs the discrimination information held in the storage section (I8) to the processing section (24).

Then, the discrimination information converted into transmission data by the processing unit 124) is sent to the modem unit (19+) and the cable (7a).
The discrimination information is sent to the modem unit 4 via the mobile station (12a), and the discrimination information held in the slave station (12a) is transmitted to the master station (11).

Further, the discrimination information input to the modem section (25) is transmitted to the detection section (28) via the processing section (26), and the detection section determines whether the accident section is the slave station (28) based on the input discrimination information. 12a) is the own station section (a1) or not.

At this time, since the section (4tl) is not an accident section, based on the identification result of the detection section -, the generation section (29) sends the slave station (
12a) is output, and the unlock command is sent to the processing unit (26), the modem unit (25), and the cable (7b).
) to the modem section (19) of the slave station (12a).

The unlock command transmitted to the modem section (19) is then transmitted to the control section (15) via the detection section (20).
The control unit (15) unlocks the switch (4a).

Furthermore, when the open lock is released, since the power receiving side of the switch (4a) has been restored, the control unit (15)
The switch (4a) is immediately turned on and the healthy section (
41=1) power transmission is restored.

In addition, due to power transmission restoration in section (Well 1), the second slave station (
12b) operates, and the slave station (12+)) is polled and called based on the calling command from the generator (29).

Then, by the same operation as in the case of the slave station (12a), the discrimination information held in the slave station (12b) is transmitted to the master station (1), and the accident section is changed to the slave station (12b)'s own station interval (i.e. 2) It is identified whether or not.

Furthermore, since section (42) is not an accident section, the main station (1
A lock release command is transmitted from 1) to the slave station (12b),
The open lock of the switch (4b) is released, and the switch (4b)
) is turned on, and power transmission in the healthy section (+2) is restored.

In addition, due to power transmission restoration in section (A2), the third slave station (
12C) operates, and the slave station (12c) is polled and called based on the next calling command from the generator (29).

Then, the discrimination information held in the slave station (12c) is transmitted to the master station (11) by the same operation as in the slave station (12b).

At this time, the discrimination information of the slave station (12c) is
), the detection unit a8) identifies the section (i3) as an accident section based on the discrimination information of the slave station (12c), and detects the accident section.

When the accident zone is detected, the output of the unlock command from the generation unit (29) and the output of the call command from the next slave station (12d,) are prohibited, and the switch (4C) is kept in the open lock state. continues to be.

Furthermore, based on the detection of the accident section, the occurrence of an accident in the section (+3) is notified by displaying an accident on the master station (1).

Therefore, when an accident occurs, the power transmission in each healthy section is restored with only one short-term power outage based on the occurrence of the accident, without performing the conventional trial transmission, and at the same time, the substation [+
1, the accident section is detected.

Incidentally, the above-mentioned operation is shown in a flowchart as shown in FIG.

In addition, power transmission restoration in the accident section (A3) will be carried out according to the flowchart in Figure 4, and the restoration work will be carried out in the section (A3).
After the accident recovery of the main station (+3) is completed, the slave station (1
2c) is called, a lock release command is transmitted, and the opening lock of the switch (4c) is released.

At this time, by turning on the switch (4c), the distance between lX (+3
) is restored, and the subsequent switches (4d) to which are not locked open are sequentially turned on by power restoration on the power receiving side, and power transmission in all sections of the system (3) is restored.

Immediately after the lock release command is transmitted to the slave station (12c), a reset command from the generating unit (29) is transmitted to the slave station (12c) or all slave stations (12a)~, and The storage units (18) of the slave stations (12a) to (12a) are initialized.

In addition, when an accident occurs in the section (JO) closest to the substation (1) (usually the section within the substation premises), any of the slave stations (12a) ~ will send the identification information that an accident has occurred to the master station. (
At this time, the master station (11) detects the occurrence of an accident in the section (40) from no detection in the fault section or from a re-power outage during the trial power transmission based on the non-detection.

Further, in the above embodiment, a common communication cable is formed by a cable (8) consisting of an up cable (7a) and a down cable (7b), and the up data and the down data are transmitted via separate cables. However, it can of course be applied to cases where upstream data and downstream data are transmitted via the same cable by frequency multiplexing, etc. In this case, the common communication cable is one cable. Become.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

A dedicated fault detection cable is installed between each slave station to transmit the next station fault information from the next slave station, and each slave station opens and locks each section switch based on the detection of fault current. , an information retention means that retains the discrimination information obtained by categorizing the local station accident information and the next station accident information transmitted and input via the cable, even after the power is cut off based on the open trip of the circuit breaker at the fault location. The master station calls each slave station in order from the one closest to the substation until the fault section is detected after the circuit breaker is reclosed. Based on the discrimination information, the master station detects the accident section, transmits an unlock command to the slave stations in each healthy section up to the accident section, and restores power transmission in each healthy section, performing a conventional trial power transmission. This system quickly detects the faulty section and restores power transmission from the faulty section to each healthy section on the substation side, without causing only one short-term power outage due to an open trip of the circuit breaker immediately after the fault occurs. can do.

In addition, since the discrimination information is held in the mechanical latching relay that is the information holding means, even if a power outage occurs due to an open trip of a circuit breaker, discrimination can be made without having to provide a backup power source for each slave station, for example. Information can be retained continuously, and each slave station can be made small, lightweight, and inexpensive.

[Brief Description of the Drawings] Figures 1 to 4 show one embodiment of the accident section detection control device of the present invention, Figure 1 is an internal block diagram of a master station and slave station, and Figure 2 is an overall block diagram. Figures 3 and 4 are flowcharts for explaining the operation, Figure 5 is a block diagram of conventional high-voltage power distribution equipment, and Figures 6 (a) to (d) are explanations of the operation in the event of an accident in Figure 5. This is a flowchart for il+ substation, (2)... circuit breaker, (3) high voltage distribution system, (4a) to (4d), sectional switch, (8), communication cable, (11)... master station, (12a) r (12
d) Slave stations, (13a) to (13d)... Accident detection cable.

Claims (1)

[Claims] (1) At the substation at the transmission start point of a high-voltage distribution system, a circuit breaker and a master station are provided that open and trip when an accident occurs in the system, and for each sectional switch of the system that is opened due to a power outage, A slave station connected to the master station via a common communication cable and operated by a power source on the power receiving side of the switch is provided, and the slave station includes a sensor means for detecting a fault current on the load side of the switch; The switch is unlocked to prevent closing based on the detection signal of the sensor means, and the open lock is released based on a lock release command from the master station via the communication cable after the circuit breaker is closed again. switch control means for closing the switch; accident information output means for transmitting the detection signal to the previous slave station as next station accident information via a dedicated accident detection cable; Accident section discriminating means gates the own station accident information based on the own station accident information and the next station accident information from the next slave station, and outputs discrimination information as to whether an accident has occurred in the own station section immediately before the power is cut off based on the accident. , information holding means for holding the discrimination information by a mechanical latching relay; and the discrimination information held in the holding means based on a call from the master station via the communication cable after the circuit breaker is re-closed. information transmission means for transmitting information to the master station via the communication cable, and having the master station transmit each slave station near the substation based on a call command after the circuit breaker is reclosed. and an accident section detection means that detects an accident section by identifying the presence or absence of an accident in the own section of the called slave station each time the discrimination information is transmitted and input based on the call. and a command output means for outputting the lock release command to the called slave station and outputting the calling command for the next slave station until the accident zone is detected. Detection control device.