SU1697137A2 - Device for indication and control over serviceability of relay protection - Google Patents

Abstract

The invention relates to the field of electrical engineering, in particular, to relay protection devices and emergency automation of electrical installations, and is intended to signal operation and monitor the health of multi-stage relay protection without removing them from work and without disabling the protected object. The purpose of the invention is to increase the control efficiency by reducing the time to search for a defective element of relay protection. The goal is achieved by the fact that a third RS trigger, a fourth indicator and a third element I are additionally introduced into the device for signaling and monitoring the health of the relay protection. This allows localizing faults within the measuring and logic blocks of the relay protection. 1 il.

Description

The invention relates to relay protection and emergency control of electrical installations, is intended to signal the operation and control of the health of multi-stage relay protection devices without disconnecting the protected object and without removing the relay protection from operation and is an improvement of the device according to auth.s. No. 1628103.

The aim of the invention is to increase the monitoring efficiency by reducing the time to search for a defective element of relay protection.

The drawing shows a diagram of the device.

The device for signaling and monitoring the health of the relay protection contains the source 1 of the control signal, the key 2 controls with a neutral position with the first 3 and second 4 make contacts, the first elements And 5i, 625n, n

first indicators 61,626n, n first

RS-flip-flops 7i, 72, ... 7n, n second elements

And 8i, 82, .... 8n, element OR 9, second indicator 10, threshold element 2 11, second RS flip-flop 12, third indicator 13. delay element 14, separation diode 15. third element And 16, third RS- trigger 17 and fourth indicator 18.

In addition, the device contains an input unit 19, measuring logic 20 and output 21 relay protection blocks 22, the relay protection 22 consisting of n measuring logic blocks

20i, 20220n according to the number of its steps. Output

the output unit 21 is connected to the input of the switching device 23 of the switching apparatus, and each of the measuring logic units 20 includes serially connected measuring 24 and logic 25 organs.

The device works as follows.

A signal that carries information about the state of the protected object is generated during

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input unit 19 by means of, for example, measuring transformers gokai voltage and from its inputs to the inputs of the relay protection 22. In the absence of an emergency situation on the protected object there are no signals at the outputs of the measuring 24 and logical 25 bodies of the measuring and logical blocks 20 of all protection stages 22 , at the inputs and the output of its output unit 21, at the input of the switching mechanism 23. In the operation mode of the device without control, the control key 2 is in the neutral position, the closing contacts 3 and

4 open. There are no signals at the inputs and outputs of the first RS-flip-flops 7, the first 5, the second 8, and the third 16 elements AND, the element OR 9, the threshold element 211, the second 12 and the third 17 RS-triggers, and the element 14 delays LEDs 6, 10, 13, and 18 are off.

When the state of health is monitored, the first contact 3 of the control key 2 closes. The signal from the source of the control signal is fed to the (n + 1) -th input of the third element And 16, to the direct inputs of the first elements And

5and appears at their outputs, since there are no signals at the intersides of these elements. From the outputs of the first elements AND 5, signals are sent to the corresponding inputs of the measuring bodies 24 of the measurement logic blocks 20 of the relay protection 22 and through the element OR 9 to the input of the second indicator 10. The second indicator 10 is turned on and the relay protection 22 starts to be checked.

When the relay protection 22 is in good condition, the signals appear at the outputs of the measuring bodies 24 of all the stages of the relay protection and are fed to the inputs of the logic bodies 25 of the measuring and logic blocks 20 and to the n first inputs of the third element 16. The last is triggered by switching the third RS- the trigger 17 and the activation of the fourth indicator 18, signaling the correct condition of all the measuring bodies 24 of the measurement and logic blocks 20 of the relay protection 22. Since the response time of the various stages of the relay protection 22 increases read off with an increase in their numbers, the signal first appears at the output of the measuring and logic unit 20i of its first stage, from where it is fed to the first input of the second element And 8i, to the first input-threshold element 2 11 and to the first input of the output unit 21, appears at its output and goes to the second inputs of all the second elements And 8 and to the switching mechanism of the switching device 23. The second element And 8i works, it has signals at both inputs. From the output of the element And 8i, the signal is fed to the S input of the first RS flip-flop 7i, which is switched, resulting in a signal from its output being fed to the inverse input of the first element And 5i and to the first indicator 6i. The first indicator 6i is turned on, indicating that the first stage of the relay protection 22 is in good condition, and the signal at the output of the first element AND 5i and the associated input of the measuring and logic unit 20i of the first protection stage disappears. The first relay protection stage 22 returns to the initial state. Signals disappear at the output of the measuring body 241, at the input and output of the logic body 25i and, therefore, at the output of the measuring-logic unit 20i, at the output of the output

20 of the relay protection unit 21 22. at the inputs of the second elements AND 8, at the S input of the first RS flip-flop 7i, at the first input of the threshold element 2 11, and the switch of the protected object does not have time to turn off. The first indicator 6i remains on, indicating that the first stage of relay protection 22 is in good condition, the second indicator 10 continues to light, indicating a continuation of the monitoring mode.

30 After counting the corresponding time exposures, the successive stages of the relay protection 22 are checked in a similar manner alternately. If the relay protection 22 is in

35 is in good condition, after checking its last stage, the second indicator 10 goes out, indicating that the monitoring mode has ended, and all the first indicators 6 and the third indicator 18 remain on.

40 In this case, the delay element 14, which starts after the operation of the measuring logic unit 20 of the last stage, does not have time to work, since its operating time is longer than the time of return to the initial state of the relay protection 22 along the chain of the last stage. The threshold element 211 also does not work, since at each time point there is a signal on only one of its inputs.

50 To remove the triggered signals of the relay protection 22 after the end of the monitoring mode, the second pin 4 of control key 2 is closed. In this case, from the source 1 of the control signal signals

55 to the R inputs of all the first RS flip-flops 7 and the third RS flip-flop 17, the latter are switched to the initial state, the signals at their outputs disappear, and all the first indicators 6 and the third indicator 18 are turned off. After returning the control key 2 to the neutral position, the circuit of the entire device returns to the initial state.

If the measuring and logic unit 20 of any relay protection level 22 is faulty, the signal will not work at its output, the corresponding second element And 8 will not operate, the corresponding first RS flip-flop 7 will not switch and the corresponding first indicator 6 will not turn on, signaling failure of the measuring and logic unit 20 of this stage of relay protection. Moreover, if the failure in triggering of the measuring-logic unit 20 is caused by a malfunction of its measuring body 24, then the signal does not appear at the output of the latter and at the corresponding input of the third element And 16. The third element And 16 and the third RS flip-flop 17 do not work, but the fourth indicator 18 is not included.

If the measuring bodies 24 of all the stages of relay protection 22 are operational, and the failure to operate is caused by a malfunction of the logic body 25, then the third element AND 16 and the third RS flip-flop 17 work, and the fourth indicator 18 turns on, indicating that the measuring bodies of all protection levels are in good condition . The second indicator 10 in this case, after the end of the monitoring mode, remains in the on state, indicating that a signal is being input to the input of the defective protection stage. To return the scheme of the entire device to its original state, it is necessary, as in the first case, to first close the second contact of the control key 2, and then shift it to the neutral position.

If the output unit 21 in the circuit of any stage of relay protection 22, for example, the first, is in the malfunctioning state, the signal, having come out at the output of its measuring and logic unit 20i, goes to the first input of the second element And 8i and to the first input of the threshold element 2 11, but not shown at the output of the relay protection 22, as a result of which the second element AND 8i will not work, the first RS flip-flop 7i will not switch and the first indicator 6i will not turn on. However, in such a state, the listed elements will remain until the second stage of relay protection 22 triggers, since after the appearance of the signals at the outputs of its measuring and logic unit 202 and then the output unit 21, the second elements And 8i and 82 simultaneously trigger, RS-triggers 7i and 72 and the first indicators 6i and 62 are turned on.

the first and second stages of the relay protection 22 are reset. Failure to trigger the output unit 21 in the circuit of the first stage of relay protection 22

it is not fixed by its 6h indicator, but after triggering the measuring-logic unit 202 of the second stage, the signal from its output goes to the second input of the threshold element 2 11, at the first input of which no signal is present. The coincidence of the signals at least at the two inputs of the threshold element 2 11 causes its triggering, as a result of which the second RS flip-flop 12 is switched and the third

indicator 13. The on state of the third indicator 13 in this case indicates a failure in the operation of the output unit 21 in the circuit of the first stage of the relay protection 22. Similarly, the failure in the operation of the output unit is detected

21v chains of all levels of relay protection 22, except the last.

If the output unit 21 fails to operate in the circuit of the last stage of the relay protection 22, the second element E 8P, the first RS trigger 7P and the first indicator 6P do not work. However, from the output of the measuring logic unit 20P, the signal goes to the nth input of the threshold element 2 11 and to

input element 14 delay. After a time sufficient to return to the initial position of the last stage of relay protection

22 if it is in good condition, the signal appears at the output of delay element 14 and is applied to the (n + 1) -th input of threshold element 2 11. The presence of signals at the two inputs of the latter causes it to trigger, causing the second RS flip-flop to switch 12 and includes the third

indicator 13. From the output of the delay element 14 through the separating diode 15, the signal arrives at the second input of the second element 8P, causing it to trigger, since there is a signal at the first input of this element, the first RS trigger 7P and the first indicator 6n are working, after which the last the protection stage 22 returns to the initial state. Thus, the refusal to trigger the output block 21 in the chains of all

the relay protection stage 22 leads to the triggering of all the first indicators 6 and the third indicator 13. In this case, the fourth indicator 18 also turns on, indicating that all

measuring bodies 24 relay, protection 22.

In order to clear the failure signal of the output unit 21 of the relay protection 22 and return the circuit of the entire device to the idle state, it is necessary, as before, to close the second pin 4 of the control key 2 first, as a result of which the source 1 of the control signal receives signals - inputs of all the first 7, second 12 and third 17 RS-flip-flops, causing them to switch to the initial state and turning on all the first 6, third 13 and fourth 18 indicators, and then switch the control key 2 to the neutral position.

Thus, the serviceable condition of all measuring 24 and logical 25 bodies of measuring and logic blocks 20 and output block 21 of relay protection 22 is determined by the on state of all the first indicators 6 and the fourth indicator 18 when the position of the second 13 indicator is off. The failure of the measuring and logic unit 20 to operate at any stage of the relay protection 22 as a result of a malfunction of its measuring element 24 is signaled by the disabled state of the corresponding first indicator 6 and the fourth indicator 18 when the second indicator 10 is turned on, and as a result of its logical failure organ 25 - the disabled state of the corresponding first indicator 6 when the fourth 18 and second 10 indicators are on. The failure of the output unit 21 of the relay control panel 22 to be triggered by the lighting of the third indicator 13.

Under the action of relay protection 22 as a result of a short circuit on the protected object, the signal from the output of the measuring-logic unit 20 of its triggered stage is fed through the output unit 21 to the switching mechanism of the switching device 23, causing the switch to turn off, to all second inputs of the second elements And 8 and at the first input of one of them, corresponding to the number of the activated protection level, causing it to fire. From the output of this element, the signal arrives at the S input of the corresponding RS flip-flop 7, which switches, causing one of the first indicators b to be turned on. The switched on indicator 6 signals the operation of the relay protection 22 along the circuit of the corresponding stage. The fourth indicator 18 is not turned on in this case, since the control key is in the neutral position and the signal to the (n + 1) -th input of the third element And 16 is not received.

In order to remove the signal about the operation of the relay protection 22 in any of the stages as a result of a short circuit on the protected object and return the circuit of the entire device to the initial state, it is necessary to first close the second contact 4 of control key 2, and then transfer it to the neutral position.

Thus, the proposed device, the first RS-triggers 7 and the first indicators 6 perform the functions of a signal authority, fixing the operation of the relay protection 22 through a circuit of any of the stages during a short circuit on the protected object, and also signal together with the second 12 and third 17 RS - triggers, the third 13 and fourth 18 indicators of its state in the control mode, ensuring the localization of faults within the measuring bodies 24, the logic bodies 25 of the measuring and logic blocks 20 of each stage or the output block and 21 relay protection 22.

- Application of the proposed device will significantly reduce the time for finding and replacing the failed element in the relay protection circuit due to localization of faults within the measuring and logic units, which increases the control efficiency and reduces the likelihood of failure of the relay protection due to its failure state.

Claims (1)

The invention is a device for signaling and monitoring the health of a relay protection according to the author. No. 1628103, characterized in that, in order to increase the control efficiency by shortening the search time for a defective relay protection element, a series-connected third element AND, a third RS trigger and a fourth indicator are additionally introduced, and the inputs of the third element And are connected to the outputs measuring bodies of measuring-logic blocks of the corresponding relay protection levels, (n + 1) -th input is connected to the first closing contact of the control key with a neutral position, to the second closing contact m contact which is connected to the R-input of the third RS-flip-flop.