SU1656607A2 - Device for signalling and monitoring serviceability of relay protection - Google Patents

Description

SUBSTANCE: invention relates to protection and automation of anti-accidental automation systems from various vc mainframes and is intended to install signaling devices for monitoring automatic equipment of, for example, step-by-step relay protection devices for removing them departures and shutdown of the protected object

The purpose of the invention is to increase the reliability by detecting, in the monitoring mode, to measure their failures in the operation of any of the steps to protect the environment by operating time and i / IX.

The Hd of Fig. 1 is a pre-tapl scheme. Fig 2 - time diagrams of his work

Resistance for signaling and control of -HI 1comparability of relay protection 1 including Odeiv one block2

measuring logic 3i. , 3n and output 4 relay protection blocks, and the output of block 4 is connected to the input of switching device 5 of the switching device containing the control signal source 6 control key 7 with the first 8 and second 9 contact contacts of the first elements AND 10 10, 10P, n the first indicators 11i 112 11n n first RS-flip-flops 12i 122 12П and n second elements AND 11-1 132 13П element OR 14. To the output of which is connected the second indicator 15 and the digital input 16 of the delay element with n outputs, the third element And 17i, 17n, n second RS-flip-flops 18t 182, 18p and fifth third indicators 14i 192 .1 9P

The device works as follows

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

C; 0

with

ON SL O O

ABOUT

VI

Yu

input unit 2 using, for example, current and voltage measuring transformers. In the absence of an emergency at the protected object, there are no signals at the outputs of the measuring logic blocks 3 of all relay protection stages 1, at the inputs and outputs of its output unit 4 and at the output of the switching mechanism 5. In the operation mode of the device without control, the control key 7 is in the neutral position, its closing contacts 8 and 9 are open. The signals at the inputs and outputs of the first 10, second 13 and third 17 elements And, the first 12 and second 18 RS-triggers, the element OR 14 and the digital element 16 delay are absent, and all indicators 11, 15 and 19 are turned off.

When monitoring the health, the first contact 8 of the control key 7 is closed. The signal from the source 6 of the control signal is supplied to the forward inputs of all 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 10 and signals are fed to the corresponding inputs of the measuring and logic blocks 3 relay protection 1 and through the element OR 14 to the inputs of the second indicator 15 and the digital delay element 16, which is triggered. The second indicator 15 is turned on, and the relay protection begins to be checked.

If the relay protection is in good condition, the signal first appears at the output of the measuring and logic unit 3i of its first stage (no hardware failure), from where it is fed to the first inputs of the And 13t and 17i elements and appears at its output and enters the second inputs of all elements And 13 and the switching mechanism 5 of the switching apparatus. Simultaneously from the first output of the digital delay element 16, the signal is fed to the second input of the third element I 17i and, if the response time of the measuring and logic unit 3i of the first protection stage is within the specified limits (no parametric failure), the signals at the inputs of the And 17i element coincide. From the output of the element And 17i, the signal is fed to the S input of the RS flip-flop 18i, which switches, resulting in a signal from its output being fed to the input of the indicator 19i. The indicator 19i is turned on, indicating the absence of a parametric failure in the operation of the first protection stage. From the output of element VI 13i, the signal arrives at the S input of the RS flip-flop 121, appears at its output and is fed to the inverted input of the AND element 10i and the indicator 111. The indicator 111 turns on, indicating that there is no hardware failure in the first stage of relay protection and the signal at the output element And 10i

and the associated input of the measuring logic unit 3i of the first protection stage disappears. The first stage of relay protection returns to its original state. The signals at the output of the measuring logic unit 3i, the output of the output block 4 of the relay protection, the outputs of the elements 13 and 17i disappear, at the S inputs of the RS flip-flops 12i and 18i, and the switch of the protected object does not have time to turn off. The second indicator 15pro5 should be lit, indicating a continuation of the control mode.

After counting the corresponding time exposures, all subsequent

0 stages of relay protection. If the relay protection 1 is in good condition (there are no hardware and parametric failures in all its stages), then after checking the last stage, the second indicator 15,

5 goes out (as the signals disappear at all inputs of the element OR 14), signaling the end of the monitoring mode. All indicators 11 and indicators 19 remain on, with the first indicators 11

0 signals the absence of hardware failures, and the indicators 19 indicate the parametric failures in the corresponding levels of relay protection.

Timeline, explanatory

5, the process of monitoring the time parameters of the individual stages of relay protection in their intact state is shown in FIG. 2

To detect parametric faults in the operation of individual relay protection stages, the signals at the outputs of the digital delay element 16 should appear after a time equal to the minimum allowable setpoint time (tycr. Min) of the corresponding step, and disappear after a time equal to the maximum allowable time setpoint (tyCT. max) the same degree of protection, after giving a signal to the input of this element. In this case, the duration of the signal existence at any output of the digital delay element 16 is equal to the difference tycr. max - tyci. mln, T.ft. The total additional protective effect of the stimulus error in the time of operation of the corresponding stage of relay protection.

Thus, about the good condition of relay protection, i.e. the absence of hardware and parametric failures in it, is signaled by the on state of all indicators 11 and 19.

To remove these signals after the end of the control mode, the second pin 9 of the control key 7 is closed. At the same time, signals from the source 6 of the control signal are sent to the R-inputs of all RS-flip-flops 12 and 18. The latter are switched to the initial state, the signals at their outputs disappear and the indicators 11 and 19 are turned off. After returning the control key 7 to the neutral position, the device returns to the initial state.

If a parametric failure occurs in the measuring-logic unit 3 of any level of relay protection, i.e. the response time of this stage is not within the specified limits, and there is no hardware failure, the signals from the relay protection and the digital element 16 do not coincide at the inputs of the corresponding element And 17, as a result of which it does not work. The corresponding RS-flip-flop 18 does not switch and the corresponding indicator 19 does not light up, indicating a parametric failure of this relay protection level. As a result of the occurrence of signals at the output of the measuring and logic unit 3 of the considered stage of relay protection 1 and at the output of its output unit 4, signals appear at both inputs of the corresponding element I 13. at its output and the S input of the corresponding RS flip-flop 12. The last switches, with the result that the signal from its output is fed to the input of the corresponding indicator 11 and to the inverse input of the corresponding element AND 10. The indicator 1 is turned on, indicating that there is no hardware failure in the relay relay stage under consideration protection, which returns to its original state.

Thus, a parametric failure in the operation of any stage of relay protection is signaled by the switched off state of the corresponding indicator 19, and by the absence of hardware failures — the on state of all the indicators 11. The indicator 15, after the end of the monitoring mode, turns off. To return the entire device to its original state, it is necessary, as in the first case, to first close the second pin 9 of the control key 7, and then transfer it to the neutral position.

If a hardware failure occurs at any stage of relay protection, then the signal does not appear at the output of its measuring-logic unit 3, the corresponding elements of AND 13 and 17 do not work, the corresponding RS-flip-flops 12 and 18 and The corresponding indicators 11 and 19 are not included. The indicator 15 in this case, after the end of the monitoring mode, remains in the on state, indicating that. that the signal to the input of the defective protection stage is applied.

Thus, a hardware failure in the operation of a relay protection level 1 is signaled by the switched off state of the corresponding indicators 11 and

19 and the on state of the indicator 15. To return the entire device to its original state, it is necessary, as before, to first close the second pin 9 of the control key 7, and then transfer it to the neutral position.

When the relay protection as a result of a short circuit on the protected object, the signal from the output of the measuring-logic unit 3, its actuated stage goes through the output unit 4 to the switching device switching mechanism 5, causing the switch to open, to the second inputs of the And 13 elements and the first input of

of them. corresponding to the number of the triggered protection stage, causing it to fire. From the output of this element, the signal arrives at the S-input of the corresponding RS-flip-flop 12, which switches, causing one of the indicators 11 to turn on. The switched-on indicator 11 signals that the relay protection 1 has triggered along the circuit of the corresponding level. The indicators 15 and 19 are not included in this case, since the key

7 is in the neutral position, the OR 14 element and the digital delay element 16 are not working. In order to remove the signal that the relay protection 1 has triggered through any of the stages as a result of a short circuit on the protected object and returning the device to the initial state, it is necessary to first close the second pin 9 of the control key 7, and then bring it to the neutral position.

Thus, in the proposed device, the RS-triggers 12 and the indicators 11 perform the functions of a signaling organ,

fixing the operation of relay protection along the circuit of any of the stages in case of short circuit on the protected object, and also signals in the monitoring mode that there is no hardware in the protection

bounce. RS-triggers 18 and indicators 19 serve for fixing parametric failures in the operation of any of the relay protection stages 1 in its control mode, and together with RS-triggers 12 and indicators 11 they indicate a good condition

protection state (absence of hardware and parametric failures).

The proposed device provides detection in the control mode of parametric failures in the operation of any of the stages of relay protection caused by the change in the operation time of their action, which increases the reliability of the relay protection.

Claims (1)

The invention is a device for signaling and monitoring the health of a relay protection according to the author. Ne 1457013, characterized in that, in order to increase reliability by detecting parametric failures in any of the stages of relay protection caused by a change in operation time during their operation, a digital delay element is added to it, the fifth And, n second RS elements triggers and third indicators, with In this case, the first inputs of the third elements And are intended to be connected to the outputs of the measuring logic units corresponding to the relay protection stages, the second inputs are connected to the outputs digital delay element, whose input is connected to the output of the OR element, the outputs of the third elements And through the corresponding S-inputs of the second RS-flip-flops are connected to the inputs of the corresponding third indicators, the S-inputs of the specified flip-flops are connected and connected to the second make contact of the control key with a neutral position.