JPS62125925A - Failure selecting relay - Google Patents

Abstract

PURPOSE:To achieve discrimination between automatic trip and selective trip by providing a circuit for generating an output signal when a high speed circuit breaker is opened, a circuit which is reset when the high speed circuit breaker is closed and set by a selective trip command to generate an output signal, and others. CONSTITUTION:When a high speed circuit breaker 2 is automatically tripped by overcurrent in a feeder 3, the high speed circuit breaker 2 is opened without an off command of a control circuit 13, so that a first circuit 11 in a failure selecting relay 5 generates an output signal. At this time, as a second circuit 16 is in the reset condition since the high speed circuit breaker 2 was closed, a third circuit 19 generates an output signal. On the other hand, when the high speed circuit breaker 2 is opened by a selective trip command of the failure selecting relay 5, the first circuit 11 produces an output signal. At this time, as the second circuit 16 is set by the selective trip command, the third circuit 19 produces no output signal. Therefore, the kind of trip can be discriminated by the output signal of the third circuit 19 when the high speed circuit breaker 2 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fault selection relay device for protecting feeder lines for electric railways to which high-speed circuit breakers are connected.

[Conventional technology]

In general, short circuits and ground faults in feeder lines in electric railway power transmission systems can affect humans, so railway substations are equipped with high-speed circuit breakers and fault selection relays to quickly eliminate accidents. It is being

In addition to a mechanism that opens in response to a trip command from an external control circuit or relay device, high-speed circuit breakers are equipped with a mechanism that automatically trips in response to overcurrent. In addition, the fault selection relay device detects a fault and selects it as a high-speed breaker based on the load current and fault current at this time, based on the current increase, because electric cars are the load in this power transmission system, and the load fluctuates rapidly. Outputs trip command.

[Problem that the invention seeks to solve]

The control circuit outputs a disconnection command to the high-speed breaker using other protective relay devices on the feed line, and also detects automatic tripping of the high-speed breaker.

For example, it is equipped with a mechanism for displaying information and responding to accidents.

However, since this control circuit uses an arithmetic processing unit such as a programmable controller or an electronic computer, if the high-speed breaker is opened directly by the fault selection relay device, the high-speed breaker will open in about 15 to 20 milliseconds. This made it difficult to distinguish between a selective trip command and an automatic trip command, and there were cases where an erroneous judgment was made.

Accordingly, the present invention provides a fault selection relay device that includes a mechanism for determining whether a high-speed breaker is opened by a selective trip command or an automatic trip command.

[Means for solving problems]

The present invention will be explained using a circuit diagram showing a fault selection relay device for protecting a feeder line shown in FIG.

A fault selection relay that outputs a selection trip command when the current increase rate of the feeder line 3 connected to the DC substation main JliAl via a high-speed breaker 2 equipped with a mechanism that automatically trips in response to overcurrent is a predetermined value or more. In the device 5, a first circuit breaker which outputs a disconnection signal when the high-speed breaker 2 is opened without a disconnection command from the control circuit 13 which outputs a disconnection command to the high-speed breaker 2 by another protective relay device of the feeder line 3; a circuit 11 and a second circuit 16 which is reset upon closing of the high speed breaker 2 and set by a selected trip command to produce an output signal;
and a third circuit 19 that produces an output signal when the output signal of the first circuit 11 and the inverted output signal of the second circuit 16 occur together.

[Effect]

The operation of the fault selection relay device will be explained with reference to the time chart of FIG.

When the high-speed breaker 2 automatically trips due to an overcurrent in the feeder line 3, the high-speed breaker 2 automatically trips without a disconnection command from the control circuit 13.
is open so that the first circuit 11 produces an output signal. At this time, the second circuit 16 remains reset when the high speed breaker 2 is turned on. Therefore, the output signal of the first circuit 11 and the inverted output signal of the second circuit 16 are established, and the third
The circuit 19 outputs an output signal. Furthermore, when the high-speed circuit breaker 2 is opened in response to a selective trip command from the fault selective relay device 5, the output signal of the first circuit 11 is established. At this time,
The second circuit 16 is set by a select trip command. Therefore, the output signal of the first circuit 11 and the second circuit 16
The inverted output signal does not hold, and the output signal of the third circuit 19 does not hold. Therefore, depending on the output signal of the third circuit 19 when the high-speed breaker 2 is opened, it is distinguished whether the trip is an automatic trip or a selective trip.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. A feeder line 3 is connected to a DC substation bus 1 via a high-speed breaker 2. Feeder wire 3 that supplies power to electric car 4
A high-speed circuit breaker 2 is used as a circuit breaker that automatically trips to open its own mechanism in response to overcurrent in order to protect the circuit. Furthermore, a failure selection relay device 5 is provided to accurately detect accidents even when the electric vehicle 4 undergoes severe load fluctuations. The failure selection relay device 5 issues a selection trip command to open the high-speed breaker 2 when the current increase rate of the feeder line 3 is equal to or higher than a set voltage value. That is, the current value of the feeder line 3 is inputted via the current transformer 6, the increase rate of this current value is detected by the detector 7, and compared with the set voltage value by the comparator 8. When the rate of increase in the input current value is equal to or higher than the set voltage value, the output pulse generation circuit 9 outputs a selection trip command based on the output of the comparator 8, and the relay 10 is energized. Contact 10a interlocked with relay 10 closes, opening high-speed breaker 2.

In addition to the above configuration, the first circuit 11 includes a contact 12 that closes and opens in response to the open and close state of the high-speed breaker 2.
A negative circuit (hereinafter referred to as N) that inverts the output signal from the control circuit 13 and the ON command and OFF command from the control circuit 13.

There is an AND circuit (hereinafter referred to as an AND circuit) 15 which inputs the output signals of the circuit 14 (hereinafter referred to as an AND circuit). A flip-flop circuit (hereinafter referred to as FF circuit) that is reset by the output of the NOT circuit 17 which inputs the output signal from the contact 12 as the second circuit 16, and is set by the selection 1-rip command of the output pulse generation circuit 9. ) 18 is provided.

An AND circuit 20 is provided as a third circuit 19 into which the output signal of the first circuit 11 and the output signal of the second circuit 16 are input. When the output signal of the AND circuit 20 is satisfied, the output pulse generating circuit 21 excites the relay 22. relay 22
The contact 22a interlocked with is closed and transmits the output signal of the third circuit 19 to the control circuit 13.

The function of distinguishing trip commands of the failure selection relay device 5 having the above configuration will be explained with reference to the time chart of FIG. 2.

(1) If the high-speed breaker 2 automatically trips due to an overcurrent in the feeder line 3, the high-speed breaker 2 will open when the contact 12 is closed and there is no disconnection command from the control circuit 13, so NOT Output signal (d) of circuit 14 and contact 1
The output signal (b) from the AND circuit 15 is established, and the output signal (h) of the AND circuit 15 is established. At this time, since the FF circuit 18 maintains the state reset by the output signal (e) of the N○T circuit 17 when the high-speed breaker 2 is turned on, the inverted output signal (g) is established. Therefore, AND
When the output signal (h) of the circuit 15 and the inverted output signal (g) of the FF circuit 18 are established, the output pulse generation circuit 21 excites the relay 22 by the output signal (i) of the AND circuit 20. When the contact 22a linked to the relay 22 closes, the control circuit 13 determines that the high speed breaker 2 has tripped.

(n) When the current increase rate of the feeder line 3 exceeds the set voltage value and the fault selection relay device 5 operates and a selective trip occurs, (1) Similarly, the output signal (d) of the NOT circuit 14 and the contact The output signal (b) from 12 is established and AN
The output signal (h) of the D circuit 15 is established.

However, at this time, the FF circuit 18 is set by the selection trip command, so the inverted output signal (g) does not occur. Therefore, the AND circuit 20 does not produce the output signal (i) and the relay 2
2 is not energized, the control circuit 13 determines that the high-speed circuit breaker 2 is not automatically tripped but selectively tripped.

As described above, it is possible to determine whether the high-speed breaker 2 was opened by a selective trip command or an automatic trip command, and the control circuit 13 provides a display, etc., thereby speeding up accident response. can be done.

〔Effect of the invention〕

The present invention provides an output signal of a first circuit that produces an output signal when the high-speed breaker opens without a command to shut off the control circuit, and an inversion of the second circuit that is reset when the breaker is closed and set by a selective trip. By including a third circuit that produces an output signal when the output signal and the
It has the effect of being able to determine whether it has been released.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a fault selection relay device for protecting a feeder line, and FIG. 2 is a time chart showing the operation of the fault selection relay device. 2...High speed breaker 3...Feeding line 11...First circuit 12.22a...Contact 13...Control circuit 14.17...Negating circuit 15, 20...
・Logic product circuit 16...Second circuit 18...Flip-flop circuit 19...Third circuit Agent Patent attorney Nori Chika Ken Yudo Hirofumi MitsumataFigure 1 <O) a Hayahiko (ya A Day!-12λ after-1-)1 wah-
(c) Control circuit 13゜Honkai No. 8, L℃ Niyoro/4 (117 Eka (No. 2 f4J output)) (Russ generation port No. 4)
. 9＾Nirikifukugo (#) 7fu 70... 7 concave seaweed / 1178 anti-flat Eeka signal 2nd figure 薯 ``-1-Star one-way letter toso,, 7゛ combination

Claims (1)

[Scope of Claims] A failure that outputs a selective trip command when the current increase rate of a feeder line connected to a DC substation bus through a high-speed breaker equipped with a mechanism that automatically trips in response to overcurrent is a predetermined value or more. In the selective relay device, a first circuit that generates an output signal when the high-speed breaker is released without a disconnection command from a control circuit that outputs a disconnection command to the high-speed breaker by another protective relay device of the feeder line. and a second circuit breaker that is reset upon closing of the high speed breaker and set by the selected trip command to produce an output signal.
with the circuit. A fault selection relay device comprising: a third circuit that generates an output signal when the output signal of the first circuit and the inverted output signal of the second circuit occur together.