JPH0260423A - Faulty section detector/controller - Google Patents

Abstract

PURPOSE:To recover transmission of power through each sound section quickly by detecting a faulty section based on the duration of shortcircuit pulse immediately after open trip of a circuit breaker untill variation of the shortcircuit voltage on a communication cable to a bias voltage. CONSTITUTION:Upon occurrence of fault in the section #3 of a slave station 12c, a circuit breaker 2 is opened to lock a switchgear 4a in open state. At the same time, delay relays at slave stations 12a-12c function for a delay time being set to shortcircuit the signal line of a cable 7b. Furthermore, DC bias voltage is applied onto the signal line of the cable 7b through a master station. Upon finish of operation of the slave station 12c, shortcircuit of the signal line of the cable 7b is released and the shortcircuit voltage changes to bias voltage. The faulty section #3 is detected based on the data of shortcircuit pulse duration and the data of delay time of the slave station 12a. Then the circuit breaker 2 is reclosed and an unlock command is transmitted upto the section immediately before the slave section 12c in the faulty section #3 in order to throw in the switchgears 12a, 12b.

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)
, (4b), (4c), (4d), - creates multiple sections (#0), (#1), (+=2), (#3), (#
4) In order to monitor the status of the switch (4a) ~ on the substation (1) side, and perform remote control, etc.
A master station (5) having the control function, communication function, and monitoring function of the circuit breaker (2) is installed in the substation (1), and the master station (5) and the switch (4a) Child station (6
a), (6b), (6c), (6d), - Toka, Tatoeha are connected via a common communication cable (8) having an up cable (7a) and a down cable (7b).

Shutoff +a (2) is turned on by manual operation or through control of the master station (5), and when an accident occurs in the system (3), it is detected by an accident detection device such as a protective relay at the substation (1). Automatically (this release is tripped) based on the following.

In addition, each slave station (6a) having the control function 9 communication function of the switch (4a) is connected to the substation (6a) of the switch (4a) unless reverse power is transmitted from another substation, etc. 1) side is the power receiving side, and a transformer (9a) provided on the power receiving side.

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

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

Then, during normal times when power is transmitted from substation (1), each slave station (
6a), when power starts to be supplied, turn on each switch (4a) by continuing the power supply for a few seconds to confirm power reception, and at this time, unless the switch (4a) is locked open to prevent turning on, the switch (4a) is turned on. 4a) ~ is injected 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, the power is supplied from the transformer (9a) based on the grid voltage on the receiving side of switching n (4a) to switching '1'.
9r C4a) are turned on in order, and the power transmission of each slave station (6a) to its own station section (#1) is started in order.

Next, if an accident occurs in a section (#3), for example, during power transmission, the accident section is detected through a trial power transmission to be described below, and power transmission in each healthy section is restored.

In other words, when an accident occurs in the t1 time section (#3) and the transmission current becomes an overcurrent, based on the detection by the accident detection device, as shown in FIG. (
2) opens and trips, power transmission is stopped, and the first power outage occurs.

At this time, based on the open trip of the circuit breaker (2), the system voltage changes to no-voltage l? as shown in FIG. 6 (1). -The power supply to each slave station (6a) is stopped, and at t1, which is a little later than 1 o'clock, the switch (4a) is opened.

By the way, the circuit breaker (2) which has tripped is turned on again at 12:00 by manual operation or by re-turning on the trial power transmission of the master station (5) based on the timer system J.

Then, when the system voltage is restored based on the closing of the circuit breaker (2), the power supply to the slave station (6a) is restarted at 9ζ, the switch (4a) is closed, and then the power supply to the slave station (6b) is restarted. is restarted, the switch (4b) is closed, power supply to the slave station (6C) is restarted, and the switch (4C) is closed 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 time t8 until the voltage drops to no voltage is shorter than the disappearance confirmation time Δt,
As shown in Figure 6'(d), the switch (4C)
The lock was opened at 2:00 p.m., and at this time, the accident section (
#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 (41) ) are turned on in order, but the switch (4
C) is prohibited from being inserted due to the release lock, so
It is kept open without being turned on, and power transmission is restored in the healthy section (#0)-(#2) on the substation (1) side from the accident section (#3).

In addition, the master station (5) and each slave station (6) are connected via the cable (8).
a) The master station (5) sends the substation (1
) side, the accident section (#3) 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, so 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. an accident detection means for detecting the occurrence of an accident at the open trip of the circuit breaker and outputting an accident detection signal; and a mechanical delay relay triggered by the detection signal f, which is connected to a slave station near the substation. accident detection and notification means for short-circuiting the cable by operating for a delay time set to be as short as possible; switch control means for releasing the open lock and closing the switch based on a lock release command from a station via the cable; A cable bias means for applying a predetermined bias voltage to the cable and releasing the application of the bias voltage after detecting a fault section, and a short circuit pulse from immediately after the open trip of the circuit breaker until the cable returns to the predetermined voltage. Based on an accident area detection means for detecting an accident area based on time, and a detection result of the accident area detection means.

After the circuit breaker is re-closed, the release command is transmitted to each slave station from the slave station closest to the substation to the slave station immediately before the slave station whose own area is the accident zone, via the cable. A technical measure is taken to provide a lock release control means.

[Effect]

In the case of the accident section detection control device configured as described above,
When an accident occurs during power transmission, the accident detection means of each slave station whose own station is each section up to the accident section detects the occurrence of an accident and outputs an accident detection signal, and the delay relay operates based on the detection signal. As a result, the common communication cable begins to be short-circuited by the accident detection and notification means of each of the slave stations.

Furthermore, when a circuit breaker in a substation is tripped due to an accident, the cable bias means and fault section detection means of the master station are often activated by the open trip.

Further, by the operation of the switch control means based on the accident detection signal of each slave station, the switches in each section up to the accident section are locked to prohibit closing Cζ.

By the way, the short-circuit time of the cable differs depending on the slave station, and the short-circuit time based on the slave station in the accident section whose own station section is the accident section is the longest.

After an open trip of the circuit breaker, when the short circuit of the cable caused by the slave station in the fault section ends and the cable voltage changes from the short circuit voltage to the predetermined bias voltage, at this time, the short circuit pulse time immediately after the open trip ends. Based on the timing,
The accident section detection means of the master station detects the accident section.

Furthermore, when the circuit breaker is re-closed, based on the detection of the fault section, the lock release control means of the master station is used to control each slave station from the nearest slave station to the substation to the slave station immediately before the slave station in the fault section. A lock release command is transmitted to the stations in order, the open lock of the switch in each healthy section is released, and power transmission in each healthy section is restored without performing the conventional test power transmission.

〔Example〕

An embodiment will be described below with reference to FIGS. 1 to 4.

In Fig. 2Cζ, which shows the entire block when applied to a three-phase high-voltage distribution system, 0υ is the master station with one substation, (12a), (121)), (12c), (12cl).
), ... are slave stations provided for each switch (4a) ~, (
Sl) and (S2) are a plurality of CTs and ZCs that detect the grid current of each slave station (12a) to its own station section (#l).
It is T.

Each slave station (12a) ~ has the same configuration, and the master station 0
1) The internal parts of each slave station (12a) are provided with the various parts shown in FIG.

In Fig. 1, q3,0(a) is CT(Sl),
It is an accident detection part and a detection signal output part that together with ZCT (S2) form an accident detection means, and each opening/closing W (4, 1) is used to prevent fault currents caused by short circuits, ground faults, etc.
~ When the occurrence of an accident on each load side is detected, a high-level accident detection signal is output from the output section Oa.

09 is a switch control section forming a switch control means,
The opening and closing of each switch (4a) is controlled in the same manner as in the prior art, and each switch (4a) is opened and locked by an accident detection signal from the output section (14).

0Q is a part of the delay pulse relay forming the accident detection and notification means, and consists of an off-delay type mechanical delay relay that is triggered by the accident detection signal f from the output section 0Q.
The closer the slave station is to the substation (1), the shorter the delay time is set, and it operates for the delay time to short-circuit the signal line of the cable (71) to the common line and short-circuit the cable (7b) to earth.

07) is a slave station modem unit connected to the cables (7a) and (7b), and 08) is a transmission/reception processing unit connected to the modem unit aη, which performs serial and parallel conversion of transmitted and received information.

01 is a data processing unit connected to the processing unit 08),
Generates transmitted information and deciphers received information.

The wire is a master station modem unit connected to cables (7a) and (7b), and Qυ is a modem unit (4) (a transmission/reception processing unit connected to this), which performs serial and parallel conversion of transmitted and received information.

(A) is a data processing unit connected to the processing unit ■υ,
Generates transmitted information and deciphers received information.

@ is a command generation unit that generates a polling call command for each slave station (12a) and a command to release the open lock, and forms a lock release control means. (c) is a power failure detection control unit that detects a power outage in system (3) from the open trip of circuit breaker (2) and controls the closing of circuit breaker (2); (b) is a detection control unit connected to control unit ■; The control unit (A) is a cable bias unit forming cable bias means, and its operation is controlled by the control unit (C), for example, a circuit breaker (2).
) immediately after the open trip of the circuit breaker (2) until the fault section is detected, or immediately after the open trip of the circuit breaker (2) for a certain period slightly longer than the longest delay time, the cable (7
Apply a predetermined DC bias voltage to the signal line b).

(a) is a timer section that starts timing operation by the timer start pulse of the control section (a); (b) is a timer stop generation section that supplies a timer stop pulse to the timer section (a) based on the detection of the cable (7b); ) is the timer section (
It is an accident section detection unit into which the timing data of (b) is input,
The control section (c), the timer section (a), and the detection section (g) form an accident zone detection means together with the 9 generation section, and detect the accident zone from the short circuit pulse time from the start pulse to the stop pulse. The results are sent to the generation unit (2) and the control unit (
b) etc.

By the way, when power is normally transmitted from the substation (1), each slave station (12a) ~ is connected to the transformer (9a) on the power receiving side of the switch (4a) ~, similar to the slave station (6a) ~ in Fig. 5. It is driven by the power source of ~ and monitors fault fluctuations in the system current by the detection unit (11ζ) based on the current detection of CT (Sl) and ZCT (S2).

Then, the local station section (#3) of the slave station (L2C)
When an accident occurs, the grid current in sections (#0) to (#3) fluctuates, and based on the fluctuation detection in each section (#1) to (#3), the slave stations ( 12a)
An accident detection signal is immediately output from the output section 0 (12c).

Also, based on the accident detection signal of the output unit 04), the slave station (
The delay relays of the relays 12a) to 12c (part ae) are triggered, and the control unit α9 of the slave stations (12a) and (12c) is commanded to open and lock the switches (4a) to (4C) to prevent closing. be done.

Furthermore, based on the detection by the fault detection device of the substation (1), the circuit breaker (2) is tripped to open, the system (3) enters a power outage state, the system voltage becomes non-voltage, and the switch (4a)
〜Each is opened, and at this time, the switch (4a)〜(
4C) is unlocked and locked by the control unit α9.

Then, due to a power outage, the power supply to each slave station (12a) is cut off, but in the slave stations (L2a) to (12c), the delay relays of the relays C11li are set even after the power supply is cut off. It operates for the delay time to short-circuit the signal line of the cable (7b).

On the other hand, the control section (
Under the control of c), a timer start pulse is output from the control part (c) to the timer part (a), and the timer start pulse is output from the control part (c) to the timer part (a).
C) [Thus, the bias section (C) and the detection section (C) are triggered.

Then, the bias section (a) applies a predetermined DC bias voltage to the signal line of the cable (7b), and the detection section (c) starts monitoring and detecting voltage fluctuations of the signal line of the cable (7b). .

By the way, immediately after the open trip of the circuit breaker (2), the signal of the cable (7b) is short-circuited and grounded based on the operation of the relays QQ of the slave stations (12a) to (12c), so that the DC bias is Even if a voltage is applied, the voltage of the signal line is maintained at the ground voltage.

The signal line of the cable (7b) is connected to the slave station (12a)
Accident section (super) on the load side of ~(12C)
When the operation of the relay part qQ of the slave station (12c) is completed, the short-circuit to earth is released, and at this time, the bias voltage changes to the above-mentioned bias voltage.

Furthermore, when the signal line of the cable (7b) changes the bias voltage lζ, a timer stop pulse is immediately outputted from the generation part 1 to the timer part @E based on the detection by the detection part example, and the timer part (a) measures the time. Operation stops.

Then, the clock data of the timer section (a) is taken in as data of the short circuit pulse time by the detection section (7), and the detection section (31
) Based on the preset delay time data of the relay part qQ of each slave station (12a) and the captured short-circuit pulse time data, the fault section (, #8) is detected and the parent station The occurrence of an accident in section (#3) is announced by a station-wide accident display.

Furthermore, when the detection by the detection section (g) is completed, the operation of the bias section (c) is stopped under the control of the control section (c), and the application of the bias voltage to the cable (7b) is finished. , the circuit breaker (2) is activated under the control of the control unit (c).
) is reinserted.

Also, based on the detection result of the detection unit (1), the generation unit @ is sent from the slave station (12a) closest to the substation (1) to the slave station immediately before the slave station (12c) in the accident section (#-8). The polling calls and generation of lock release commands up to (12b) are set.

Based on the polling call and lock release command from the generating unit, the processing unit (a), Cυ, and modem unit (e)
and a slave station (12a), (
12b), the unlock command is transmitted in sequence.

Furthermore, in the slave stations (L2a) and (12b), the transmitted lock release command is sent to the modem unit 0η and the processing unit α8.
).

It is transmitted to the control unit a9 via 0e, and the switch (4a),
The release lock (4b) is released.

Then, the switch (12a) with the release lock released, (
12b) are turned on and closed in order based on the restoration of power on the power receiving side.

Therefore, when an accident occurs, instead of conducting a conventional trial transmission, only a short power outage based on the occurrence of the accident occurs.
As a result, power transmission in each healthy section was restored, and at the same time, the substation (
The accident section is detected in 1).

Note that the above-described operation is shown in a flowchart as shown in Figure @3.

In addition, power transmission restoration in the accident section (#3) will be carried out according to the flowchart in Figure 4, and the restoration work will be carried out in the section (#3).
#3) After the accident recovery is completed, the master station 0υ is transferred from the slave station (1
2c) is called and a lock release command is transmitted, opening/closing
The opening of l(4c) is performed after the opening/yielding is released.

At this time, the section (#3) is switched on by turning on the switch (4c).
When the power transmission is restored, the subsequent switches (4d) to which are not unlocked are sequentially turned on by the restoration of power on the receiving side, and the power transmission in the entire section of the system (3) is restored.

In addition, if an accident occurs in the section (4I-0) closest to substation (1) (usually the section within the substation premises), the signal line of cable (7b) will continue to be maintained at the specified voltage, and at this time , the master station 0η detects the occurrence of an accident in the section (#0) from the non-detection of the fault section or the re-power outage during the trial power transmission based on the non-detection.

When the cable (8) is formed by an upstream cable (7a) and a downstream cable (7b), and upstream data and downstream data are transmitted via separate cables (this is applied, for example, by frequency multiplexing, etc.) Of course, this method can be applied when upstream data and downstream data are transmitted via the same cable, and in this case, there is only one common communication cable.

Also, instead of the signal line of cable (7b), cable (
The signal line 7a) may be short-circuited.

〔Effect of the invention〕

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

Each slave station where an accident occurred on the load side from its own station section opens and locks the sectional switch, and the master station F
From this, a predetermined bias voltage is applied to the cable (from immediately after the opening trigger knob of the breaker until the fault section is detected, and the short-circuit voltage of the cable is increased based on the completion of the short circuit of the slave station in the fault section). Detects the change in the bias voltage from By transmitting the lock release command from the terminal to the slave station immediately before the slave station in the fault section, a single short-term power outage can be achieved immediately after the fault occurs, without the need for the conventional trial power transmission. With this method, it is possible to quickly detect the faulty section and restore power transmission from the faulty section to each healthy section on the substation side.

Furthermore, since fault sections are detected using voltage fluctuations in communication cables, there is no need to increase the number of cables, and detection can be performed with a relatively simple configuration.

Furthermore, since the communication cable is short-circuited using a mechanical delay relay, even if power is not supplied to each slave station due to an open trip of the circuit breaker, communication can be continued without the need for each slave station to have a backup power source for power outage, for example. Cables can be short-circuited, and each slave station can be made small, lightweight, and inexpensive.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the accident section detection control device of the present invention, in which FIG. 1 is an internal block diagram of a master station and a slave station, FIG. 2 is an overall block diagram, and FIGS. 4 is a flowchart for explaining the operation, FIG. 5 is a block diagram of a conventional high voltage power distribution equipment, and FIGS. 6(a) to 6(d) are flowcharts for explaining the operation when an accident occurs in FIG. (1)... Substation, (2)... Breaker, (3)...
・High voltage distribution system, (4a) to (4d)... Sectional switch, (8)... Communication cable, (11)... Master station, (
12a) to (12d)...Slave stations.

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 is provided that is connected to the master station via a common communication cable and operates on the power source of the power receiving side of the switch, and the slave station is configured to detect the occurrence of an accident on the load side of the switch as an open trip of the circuit breaker. It consists of an accident detection means that detects immediately before and outputs an accident detection signal, and a mechanical delay relay that is triggered by the detection signal, and the delay time is set such that the closer the slave station is to the substation, the shorter the delay time is. an accident detection and notification means that operates to short-circuit the cable; and an open lock that prevents closing of the switch in response to the detection signal, and locking the circuit breaker via the cable from the master station after the circuit breaker is closed again. switch control means for releasing the open lock and closing the switch based on a release command, and applying a predetermined bias voltage to the cable at the master station by an open trip of the breaker. cable bias means for applying the bias voltage and releasing the application of the bias voltage after detecting the fault section; and a fault section for detecting the fault section from the short circuit pulse time from immediately after the open trip of the circuit breaker until the cable returns to the predetermined voltage. Based on the detection means and the detection result of the fault section detection means, after the circuit breaker is reclosed, each child station from the slave station closest to the substation to the slave station immediately before the slave station whose own station section is the fault section. An accident zone detection control device comprising: a lock release control means for transmitting the release command to the station via the cable.