SU1374301A1 - Apparatus for signalling and monitoring operability of relay protection system - Google Patents

Abstract

The invention relates to the field of relay protection and is intended for signaling actuation and monitoring the operability of automation equipment or relay protection. The aim of the invention is to enhance the functionality by providing control of the protection of any speed and increase the convenience of operation. In order to carry out the control, the control key 8 is closed and the control signal is fed to the input of the tested protection block 4. If the protection unit is in good condition, the R-S flip-flop 6 triggers and the first indicator 12 turns on. The second indicator 13 goes off. When the control key 8 is transferred to the second position, the RS-flip-flop 6 and the first indicator 12 are reset. If the protection unit 4 fails, the second indicator 13 turns on for a long time, the R-S-trigger 6 does not work and the first indicator 12 does not turn on. 1 il. (€ (L

Description

The invention relates to relay protection and emergency automation of electrical installations and is intended for signaling the operation and monitoring the health of discrete automation equipment, for example, relay protection devices without putting them out of work and without disconnecting the protected object.

The purpose of the invention is the expansion of the scope by providing control of the protection of any speed and improving the usability of the device.

The drawing shows a diagram of the proposed device.

The device for signaling and monitoring the health of relay protection comprises an input unit 1, a measurement unit 2 and an output 3 units 4 of relay protection, a switching mechanism 5 of a switching device, an RS trigger 6, a control signal source 7, a control key 8 with a neutral position with the first 9 and second 10 make contacts, element And 11, the first 12 and second 13 indicators.

The device operates as follows.

A signal carrying information about the state of the protected object is generated in the input unit 1 by means of measuring current and voltage transformers and from its output goes to the input of the relay protection unit 4. In the absence of an emergency situation at the protected object, there is no signal at the output of the measurement and logic unit 2 of the relay protection, at the input and output of the output unit 3, at the input of the switching mechanism 5 of the switching apparatus. In the operating mode of the device without control, the control key 8 is in the neutral position, the make contacts of its 9 and 10 are open. In this case, the signals at the inputs and outputs of the R-S-trigger 6 and the And 11 element are absent, and the indicators 12 and 13 are off.

I

When monitoring the health, the first contact 9 of the control key 8 is closed. The signal from the source 7 of the control signal is fed to the direct input of the element And 11 and appears at its output, since there is no signal at the inverse input of this element. From the output of the element And 11, the signal is fed to the input of the relay protection unit 4 and the second indicator 13, which turns on.

₅ If the relay protection unit 4 is in good condition, the signal appears at the output of its output unit 3 and enters the S-input of the RS-flip-flop 6 and to the switching mechanism 5 of the switching device.

R-S-trigger 6 is switched, and the signal from its output is fed to the inverse input of the element And 11 and to the first indicator 12, which turns on.

The signal disappears at the output of element 11, at the input of the second indicator 13 and at the input of relay protection 4. Since the signal from the input of relay protection has disappeared, it returns to its original state, the signal at the S-input of RS-flip-flop 6 disappears, and the circuit breaker object does not have time to disconnect. In this case, the second indicator 13 turns on briefly for the duration of the control signal through the relay protection. If the relay protection unit 4 'operates with a delay time, then the second indicator 13 lights up briefly, if it acts instantly, then the indicator 13 does not have time to light up, but in any case, the first indicator 12 lights up, signaling that the protection is in good condition. To remove the signal about the operation of the relay protection unit 4, when checking its operability, the second contact 10 of the control key 8 is closed. At the same time, a signal 40 is supplied from the control signal source 7 to the R-input of the R-S-trigger 6. The latter switches to the initial state, the signal from its output disappears and the first indicator 12 turns off. After returning the control key 8 to neutral.

In this position, the circuit of the entire device returns to its original state.

If the relay protection unit 4 is faulty, the signal does not appear on the 50 output of its output unit 3, the R-S-trigger 6 is in an unused state, the second indicator 13 remains on, and the first indicator 12 does not turn on. The device circuit returns to its original state after setting the control key 8 to the neutral position.

Thus, according to the state of indicators 12 and 13, the verification result is recorded and the technical state of the relay protection unit is determined. Prolonged lighting of the second indicator 13 signals a malfunctioning state of the monitored relay protection unit 4, and the first indicator 12 lights up about its working condition. The failure of both indicators 12 and 13 in the relay protection unit 4 as a result of a short circuit on the protected object.

The device for signaling and monitoring can be used for any relay protection, including high-speed ones, implemented on contactless elements; the time when the check mode is off indicates that the device for signaling and monitoring relay protection is inoperative.

When the relay protection unit 4 is activated as a result of a short circuit on the protected object, the signal from its output goes to the switching mechanism 5 of the switching device, causing the circuit breaker to trip, and to the S-input of the RS-trigger 6. Trigger 6 is switched off, causing the inclusion of the first indicator 12, which signals the protection. From the output of the R-S-trigger 6, the signal also goes to the inverse input of the element And 11. At 25, the test mode of the block 4 of the relay protection from the device for signaling and control is prohibited.

After the circuit breakers of the protected object are turned off, the relay protection unit 4 returns to its original state and does not interfere with its automatic reclosure. If during a dead time pause the short circuit self-destructs, then the automatic reclosure is successful.

To remove the signal about the operation of the relay protection unit 4 as a result of a short circuit on the protected object, memorized by the R-S-trigger 6, the second 10 contact of the control key 8 is closed. In this case, a signal is received from the source 7 of the control signal to the R-input of the R-S-trigger 6. The latter will switch back to the initial state, the signal from its output will disappear and the first indicator 12 will turn off. After returning the control key 8 to the neutral position, the circuit of the entire device returns to its original state.

Thus, in the proposed device, the R-S-trigger 6 and the first indicator 12 simultaneously perform the functions of a signaling organ when triggering45 of which amounts to tenths or even hundredths of a second.

A device for signaling and monitoring relay protection is more convenient in operation, since one of the indicators signals the serviceable state of the controlled relay protection, and the second indicates its failure. In addition, by the state of both indicators, a malfunction of the device for signaling and monitoring can be detected.

Claims (1)

Claim A device for signaling and monitoring the health of relay protection, comprising an input unit, the output of which is intended to be connected to the input of the block of controlled relay protection connected to the input of the switching mechanism of the switching device, a control signal source, the output of which is connected through the make contact of the control key to the neutral position, with direct input of the And element, RS-trigger, the output of which is connected to the first indicator, characterized in that, in order to expand the scope by providing To control the protection of any speed and increase the convenience of operation, an additional indicator with a terminal for connecting to the input of the block of controlled relay protection and the output of the And element, the inverse input of which is connected to the output of the RS-trigger, the S-input of which is designed to connect to the output of the block of the controlled relay protection, and the R-input is connected to the second NO contact of the control key with a neutral position.