SU1628103A2 - System for signalling and checking fault of relay protection - Google Patents

Abstract

The invention relates to relay protection and emergency control automation of electrical installations, and is intended to signal the operation and control of the health of multi-stage relay protection devices without disconnecting the protected object and removing it from operation. Purpose of the invention

Description

The invention relates to relay protection and emergency control automation of electrical installations, it is intended to signal the operation and control of the health of multi-stage relay protection devices without disabling the prohibited object and without removing it for operation and is additional to the author. No. 1457013.

The purpose of the invention is to increase the reliability and convenience of operation by identifying malfunctions in the operation of the measurement logic and output blocks of the relay cell.

The drawing shows a diagram of the proposed device.

The device contains an input unit 1 measuring-logic 2 and output (3 blocks of relay protection 4, and relay protection 4 consists of n measuring-lsi chesg.ih blocks 2, 2, ... 2 but the number of its steps, the inputs of which The inputs of the relay protection 4 are connected to the corresponding outputs of the input unit 1, and the outputs are connected to the inputs of the output unit 3, the output of which, being the output of the relay protection 4, is connected to the input of the switching mechanism: (paragraph 5 , source 6 of the control signal, the key 7 utlavleny with a neutral position I eat, with the first 8 and second 9 closing contacts, the first elements AND 10, 104, ..., 10n, n of the first indicators 11, n nepBrtx RS-trigger 12 hours, ..., 12h, n the second e .Cheyen / s And 13 (, 13a, ...

13P, element OR 14, second indicator 15, threshold element: 2 16 triggers when signals coincide at more than two inputs, second RS flip-flop 17, third indicator 18, delay element 19, and isolation diode 20.

Direct inputs of the first elements And 10ts, 10g. . ., 10 - through the first closing contact 8 of the control key 7 with a neutral position are connected to the source 6 of the control signal, and the outputs are connected to the inputs of the measuring and logic blocks of the 2 corresponding levels of relay protection. The first inputs of the second elements I, 13 ,, 13 ,, .., 13P are designed to connect to the outputs of the measuring and logic blocks 2 of the corresponding relay protection stages 4, the second inputs are connected to the output of the monitored relay protection 4, and the outputs are connected to S- the inputs of the corresponding first RS-flip-flops 12, the R-inputs of which are connected to the second closing contact 9 of the control key 7 with a neutral position, and the outputs of each of them are connected to the inputs of the corresponding first indicators 11 and to the inverse inputs of the corresponding first And 10 elements. moves all first AND gates 10 are connected to the inputs of OR element 14, whose output is connected to the second indicator 15.

The n inputs of the threshold element S 2 16 are intended to be connected to the outputs of the measuring and logic blocks 2 of the corresponding relay protection stages 4, and its output is connected to

five

-input of the second RS-flip-flop 17, R1

the input of which is connected to the second closing contact 9 of the control key 7 with a neutral position, and the output is connected to the input of the third indicator 18. The input of the delay element 19 is intended to be connected to the output of the measuring and logic unit 2, the last stage of relay protection 4, and you the stroke is connected to the (n + 1) th input of the threshold element t 2 16 and through the separating diode 20 is connected with the second inputs of all the second elements I.

The device works as follows.

The signal carrying information about the state of the protected object is generated in the input unit 1 using, for example, current and voltage measuring transformers, and from its inputs is fed to the inputs of the relay protection 4. In the absence of an emergency situation, the protected object has no signals at the outputs - logical blocks 2 of all protection stages 4, at the inputs and the output of its output unit 3, at the input of the switching mechanism 5. In the mode of operation of the device without control, the control key 7 is in the neutral position, the closing contacts 8 and 9 are open. The signals at the inputs and outputs of the first RS-flip-flops 12, the first 10 and second 13 elements AND, the element OR 14, the threshold element 5: 2 16, the second RS-flip-flop 17 and the element 19 delay are absent, and all the indicators 11, 15 and 18 off.

When monitoring the health, it closes the first contact 8 of the control key 7. The signal from the source 6 of the control signal is fed to the direct inputs of the first elements And 10 and appears at their outputs, since there are no signals at the inverse inputs of these elements. From the outputs of the first elements AND 10, signals are sent to the corresponding inputs of the measuring logic units 2 of the relay protection 4 n through the element OR 14 to the input of the second indicator 15. The second indicator 15 is turned on and the relay protection 4 starts to be checked. When the relay protection 4 is in good condition, the signal first

is at the output of the measuring-logic unit 21 of its first stage, from where it is fed to the first input of the second element I 13, to the first input

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The nopoioBoro element 2 1b and to the first input of the output unit 3 appears at its output and goes to the second inputs of all the second elements AND 13 and the switching mechanism of the switching device 5. A second element 13 operates, with signals on both inputs. From the output of the element And 13, the signal goes to the S input of the first RS flip-flop 12, which switches, resulting in a signal from its output being fed to the inverse input of the first element And 10 and to the first indicator 11 (. The first indicator 11 turns on, signals the good condition of the first stage of relay protection 4, and the signal at the output of the first element I 10 and the associated input of the measuring and logic unit 2 of the first stage of protection disappears. The first stage of relay protection 4 returns to the initial state. of the optical unit 24, at the output of the output unit 3 of the relay protection 4, at the inputs of the second elements I 13, at the S input of the first RS flip-flop 12, at the first input of the threshold element i2 16, and the switch of the protected object does not have time to turn off. switched on, it indicates a good condition of the first stage of relay protection 4, the second indicator 15 continues to light, indicating that the monitoring mode continues.

After counting the corresponding time exposures, all subsequent stages of relay protection 4 are sequentially checked in the same way. If relay protection 4 is in good condition, then after checking its last stage, the second indicator 15 goes out, indicating that the monitoring mode has ended, and all first indicators 11 remain on. In this case, the delay element 19, which starts after the action of the measuring-logic unit 2 of the last stage, does not have time to work, since its operation time is longer than the time of returning to the initial state of relay protection 4 along the chain of the last stage. The threshold element 2 16 also does not work, as at any moment in time the signal was present on only one of its inputs.

To remove the tripping signals of the relay protection 4 after

the control mode closes the second pin 9 of the control key 7. In this case, the source 6 of the control signal receives signals at the R inputs of all RS flip-flops 12. The latter switch to the initial state, the signals at their outputs disappear and the first indicators 11 turn off. After returning the control key 7 to the neutral position, the circuit of the entire device returns to the initial state. If the measuring-logic unit 2 of any relay protection stage 4 is faulty, the signal does not appear at its output, the corresponding second element And 13 does not operate, the corresponding first RS flip-flop 12 does not switch and the corresponding first indicator 11 does not turn on, liziru about the failure of the measuring-logic unit 2 of this stage of relay protection. The second indicator 15 in this case, after the end of the monitoring mode, will remain 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 close the second pin 9 of the control key 7 at the beginning, and then transfer it to the neutral position.

If in a faulty condition on

If the output unit 3 is located in the circuit of any stage of the protection line 4, for example, the first, then the signal, having appeared at the output of its measuring and logic

block 2 ,, will go to the first entrance

the second element And 13 and at first

the input of the threshold element 2 16, but not according to the output of the relay protection 4, as a result of which the second element 13 does not work, the first RS-flip-flop 2 does not switch and the first indicator 11 | does not turn on. However, the listed elements are in such a state until the second stage of relay protection 4 is triggered, since after the appearance of the signals at the outputs of its measuring logic 2Ј, and then the output unit 3, the second elements And 13 and 13 simultaneously trigger the first RS-flip-flops 12 (and 12 and included) with the first indicators 11 and 11g, after which the first and second relay protection level 4 returns to the initial

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condition. The refusal to trigger the output unit 3 in the circuit of the first stage of the relay protection 4 is not detected by its indicator 11j, however after the triggering of the measuring-logic unit 2 ", the second stage, the signal from its output goes to the second input of the threshold element 2 16, at the first input of which the signal is already there is. The coincidence of the signals at least two inputs of the threshold element 2 16 causes it to fire, which causes the second RS flip-flop 17 to switch and the third light 18 turns on. The third light 18 is turned on in this case, indicating that the output unit 3 in the circuit has failed relay protection stages 4. Similarly, a failure is detected in the output of the output unit in the circuit of all relay protection stages 4, except the last.

In the event of a failure in the operation of the output bpock 3 in the circuit of the last stage of relay protection 4, the second element AND 13rt first-RS flip-flop 1-pi first indicator 11 does not work. However, from the output of the measuring logic unit 2P, the signal goes to the n-th input of the threshold element-2 16 and to the input of the delay element 19. After a time sufficient to return to the initial position of the last stage of the relay protection 4 in case of its working condition, the signal appears at the output of the delay element 19 and is fed to the (P – I) th input of the threshold element 2 16. The presence of signals at two the inputs of the latter causes it to fire, which causes the second RS flip-flop 17 to switch and the third indicator 18 turns on. From the output of the delay element 19, the signal goes to the second input of the second element I 13 through the split diode 20, causing it to trip. first inlet This element has a signal, the first RS trigger is working

I2 n and the first indicator 11, after which the last stage of the relay protection 4 returns to the initial state. Similarly, the failure in the operation of the output unit 3 in the chains of all stages of relay protection 4 leads

to trigger all first indicators1

II and the third indicator 18.

Thus, the good condition of all blocks and stages of relay protection

4 ijrrpi c IHP-ICH for the inclusion of all the first indicators 11 with the second 15 and the third 18 indicators off. The refusal to intervene the measuring-logic unit 2 of any of the stages of relay protection 4 is signaled by the disabled state of the corresponding first indicator 11 and the switched on state of the second indicator 15, the failure of the output unit 3 is detected when the third indicator 18 lights up .

To remove the failure signal of the output unit 3 of the relay protection 4 and return the circuit from the device to its initial state, it is necessary, as before, to close the second KOinr.KT 9 key 7 of the control at the beginning, resulting in 6 the signal is sent to the R input of the second RS flip-flop 17, causing it to be reset and turning off the third indicator 18, and then turning the key 8 to neutral.

Under the action of relay protection 4 as a result of a short circuit on the protected object, the signal from the output of the measuring and logic unit 2 of its triggered stage is fed through the output unit to the switching mechanism of the switching device 5, causing the output switch to trip, to all the second inputs of the And I3 and to the first input of one of them, corresponding to the number of the protection stage operated, causing it to be triggered. From the output of this element, the signal arrives at the S-input of the corresponding RS-trigger 12, which switches, causing the switching-on of one of the first indicators 11. The switched-on indicator 11 signals that the relay protection 4 has been triggered along the corresponding rotary circuit.

To remove a signal that a relay has been triggered, 4 i.o chains of any of the steps are protected as a result of a short

At the beginning, close the second contact 9 of the control key 7, and then transfer it to the neutral position.

Claims (1)

Thus, in this device, the first RS-triggers 12 and the first indicators 11 perform the functions of a signaling authority, fixing the operation of the relay protection 4 along a circuit of any of the stages during a short circuit on the protected object, and also signal that it is in good condition control The second RS-flip-flop 17 and the third indicator 18 serve to fix the failure in the operation of the output 3 relay protection (the formula was invented) A device for signaling and monitoring the health of relay protection, according to author. No. 1457013, characterized in that, in order to increase reliability and convenience of operation by detecting malfunction of the measuring and logic and output relay protection blocks, a second RS trigger, a separator diode, a delay element, a third indicator and a threshold element 2, p are additionally introduced whose inputs are intended to be connected to the outputs of the measuring and logic blocks of the corresponding relay protection stages, the output is connected to the S-input of the second RS-flip-flop, the R-input of which is connected to the second make contact of the switch The neutral indicator is connected to the output, the third indicator is connected to the output, the input of the delay element is intended to be connected to the output of the measuring-logic unit of the last relay protection level, and the output is connected to the (R-AND) th input of threshold element -2 and is connected via a decoupling diode with the second inputs of all the second elements I.