SU1644253A1 - Device for warning and control of serviceability of relay protection - Google Patents

Description

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(21) 4708313/07 (22) 04.24.89 (46) 04.23.91. Bul Number 15

(71) Ural Polytechnic Institute. S.M. Kirov

(72) L. A. Lystsova and V. P. Fedotov (53) 621.316.925 (088.8)

(56) USSR Author's Certificate No. 1374301, cl. H 01 H 69/01, 1986.

USSR Author's Certificate No. 1457013, cl. H 01 H 69/01, 1987. (54) DEVICE FOR SIGNALING AND CONTROL RELAY PROTECTION CORRECTION

(57) The invention relates to relay protection and emergency control of electrical installations, and is intended to signal the actuation and control of 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 reliability by detecting in the process of checking failures that lead to both a failure to operate and unnecessary operations of any level of relay protection. For this purpose, the third closing contact of the control key 6, the second 7 and the third 8 control signal sources with p with outputs each and n second elements OR 10 are introduced into the device. 1 Il.

The invention relates to relay protection and emergency control of electrical installations and is intended to signal the operation and to monitor the health of multi-stage relay protection devices without interrupting their operation and without disabling the protected object.

The purpose of the invention is to increase reliability by detecting in the process of checking malfunctions that lead to both a failure to operate and their changes to the operation of any stage of relay protection.

The drawing shows a diagram of the device.

A device for signaling and monitoring the health of a relay protection comprising a series-connected input unit 1, n measuring-logic units 2 according to the number of its steps, output

unit 3 and the switching device switching mechanism 4, contains the first source of the control signal 5, which functions as the power source of the device, the control key 6 with the neutral position with the first 6.1, the second 6.2 and the third 6.3 make contacts, the second 7 and the third 8 sources of the control signal n outputs each, the first element OR 9 and n the second elements OR 10, n the first indicators 11 and one second indicator 12, n RS-flip-flops 13, n the first elements I 14 and n the second elements I 15.

The device works as follows.

A signal that carries information about the state of the protected object is generated in the input unit 1 using, for example, current and voltage measuring transformers, and with its output goes to

with

with

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inputs of measuring logic units 2.1 ... 2p.

In the absence of an emergency, there are no signals at the outputs of the measuring and logic blocks 2 of all protection stages, at the inputs and outputs of its output unit 3, at the input of the switching mechanism of the switching device 4. In the device operation mode without control, the control key 6 is in the neutral position , the closing contacts of its 6.1, 6.2, and 6.3 are open. While there are no signals at the inputs and outputs of the second 7 and third 8 sources of the control signal, at the inputs and outputs of all RS-flip-flops 13, the first 14 and second 15 elements And, the first 9 and second 10 elements OR, and all indicators 11 and 12 are turned off .

When the state of health is monitored, the first contact 6.1 of the control key 6 is first closed. From the first source of the control Signal 5, the second source of the control signal 7 is supplied. they appear at their outputs due to the absence of signals at the inverse inputs of these elements and are fed to the corresponding inputs of the measuring-logic blocks 2 of the relay protection and through the element OR 9 to the input of the second indicator 12. Second Indicator 12 is turned on, and the relay protection begins to be checked. The levels of control signals arriving at the inputs of the individual stages of the relay protection are set in this case equal to the trigger thresholds of the measuring and logic blocks of the 2 corresponding stages (either slightly more for maximum protection or slightly less for minimum protection), so that the last if they were in good condition, they would have occurred with a minimum difference between the parameters of the control signals and the relay protection settings.

Since the response time of the various stages of relay protection increases with the increase in their numbers, when it is in good condition, the signal first appears at the output of the measuring and logic unit 2.1 of its first stage, from where it is fed to the first input of the second element I 15.1 and to the first input output block 3, appears at its output and goes to the second inputs of all second elements AND 15 and to the input of the switching device of the switching device 4. A second element 15 is operating, whose signals are on both inputs, And the output of element 15.1 Igna arrives

to the S-input of the RS-flip-flop 13.1, which is switched, as a result of which the signal from its output is fed to the inverse input of the first element And 14.1 and to the first indicator

11.1. The first indicator 11.1 is turned on, indicating the operation of the first stage of relay protection, and the signal at the output of the first element I 14.1 and the input of the measuring-logic unit 2.1 connected with it

The first stage of protection disappears. The first stage of protection returns to its original state. Signals disappear at the output of the measuring-logic unit 2.1, at the output of the output unit 3 of relay protection, on

the inputs of the second elements I 15, at the S input of the RS flip-flop 13.1, at the input of the switching device 4. The switch of the protected object does not have time to turn off. The first indicator 12 continues to light, indicating a continuation of the control mode.

After counting the corresponding time exposures, the second is worked in the same way and so on until the last

steps of relay protection. If the relay protection is in good condition, then after checking its last stage, the second indicator 12 goes out, indicating the end of the monitoring mode, and all the first indicators 11 remain on, signaling the operation of a specific stage of relay protection.

If there are malfunctions in any relay protection level.

if it fails to operate when a reference signal is applied, the signal does not appear at the output of the corresponding measuring and logic unit 2, the corresponding second one will not work

element 15, the corresponding RS trigger 13g does not switch and the corresponding first indicator 11 does not turn on, indicating a failure of this protection stage. The second indicator 12 in this case

after the end of the monitoring mode, it remains in the on state, indicating that a signal is supplied to the input of the defective protection stage.

To clear alarms

the relay protection first opens the first contact 6.1, and then closes the second contact 6.2 of the control key 6. This removes the power from the input of the second source of the control signal 7, as a result

signals at its outputs disappear. From the first source of the control signal 5 through the second closing contact 6.2 of the control key 6, a signal is sent to the R-inputs of all RS-flip-flops 13. The latter are switched to the initial state, the signals to their

the outputs disappear and the first indicators 11 turn off,

In order to continue the monitoring mode in order to detect malfunctions resulting in unnecessary relay protection, the second contact 6.2 opens and the third contact 6.3 of control key 6 is closed. The third control signal source 8 is supplied from the first source of the control signal 5 the signals through the second inputs of the second elements OR 10 arrive at the direct inputs of the first elements AND 14, appear at their outputs due to the absence of signals at the inverse inputs of these elements and are fed to the corresponding the inputs of the measuring logic units 2 of the relay protection and through the element OR 9 to the input of the second indicator 12. The second indicator 12 turns on and the second cycle of the protection check begins. The levels of control signals arriving at the inputs of the individual stages of relay protection are set in this case by equal return thresholds of the measuring-logic blocks of the 2 corresponding steps, so that if they were in good condition, they would not trigger.

If there are no malfunctions in the relay protection causing unnecessary operations, the signals are not detected at the outputs of its measuring and logic units 2 and the output unit 3, the second indicator 12 will remain on for a long time, none of the first indicators 11 will turn on.

When a fault occurs in any stage of the relay protection causing its excessive operation, a signal appears at the output of its measuring and logic unit 2, from where it is fed to the first input of the corresponding second element 15 and to the corresponding input of the output unit 3, It is outputted at its output and is fed to the second inputs of all second elements AND 15 and to the input of the switching mechanism of the switching device 4. A corresponding second element 15 is operating, which has signals at both inputs. From the output of this element, the signal goes to the S input of the corresponding RS trigger 13, which switches, resulting in the corresponding first indicator 11 and giving a signal to the inverse input of the corresponding first element 15. Turning on the first indicator 11 signals a malfunction of the corresponding stage relay protection. As a result of the removal of the control signal from the input of the measuring and logic unit 2 of the faulty stage, it returns to the initial state, and the switch of the protected object does not have time to turn off. The second indicator is 12 in

In this case, it remains on, signaling that control signals have been applied to the inputs of the remaining protection stages.

To return the device to its original state, the third

0 contact 6.3 and the second contact 6.2 of control key 6 is closed. This removes the power from the input of the third source of the control signal18, as a result of which the signals at its outputs disappear. From the first

5 sources of the control signal 5 through the second closing contact 6.2 of the control key 6 receive a signal to the R-inputs of all RS-flip-flops 13. The latter switch to the initial position, the signals to

Their outputs disappear and the first indicators 11 are turned off. After returning the control key 6 to the neutral position, the circuit of the entire device returns to the initial state.

5 Under the action of relay protection as a result of a short circuit on the protected object, the signal from the output of the measuring-logic unit 2 of its triggered stage enters through the output

0 unit 3 to the switching mechanism of the switching device 4, causing the switch to turn off, to all the second inputs of the second elements 15 and to the first input of one of them corresponding to the number of the 5th protection stage, causing it to trip. From the output of this element, the signal is sent to the S input of the corresponding RS trigger 13, which is thrown, causing one of the first

0 indicators 11. The switched on indicator 11 signals about the operation of the relay protection along the circuit of the corresponding stage.

In order to remove the signal about the operation of the relay protection along the circuit of any of the STU5 penalties as a result of a short circuit on the protected object, it is necessary to shortly close the second contact 6.2 of the control key, and then return it to the neutral position.

0 Thus, in this device, the RS-triggers 13 and the first indicators 11 perform the functions of signaling bodies, fixing the operation of the relay protection along a chain of any of the stages both during a short circuit and in the control mode of its operation. In the latter case, the on state of any of the first indicators 11 in the first test cycle indicates that there are no faults that lead to a failure in response.

of the corresponding stage, in the second test cycle, the presence of faults causing its excessive response. The device in the process of control reveals not only malfunctions that lead to the failure of the multi-stage relay protection, but also faults that lead to unnecessary alarms. In addition, by supplying control signals of different levels corresponding to the setpoints to the various relay protection inputs triggered measurement logic units, improved test quality.

Claims (1)

Apparatus of the Invention A device for signaling and monitoring the operability of a relay protection comprising an input unit connected in series, measuring and logic blocks according to the number of its stages, an output unit and a switching device switching mechanism containing a first control source connected to the control output with a neutral position the first and second make contacts, the first And elements, the first indicators, the RS flip-flops and the second And elements, the first inputs of the last ones are intended for connecting tim to outputs of measuring and logic blocks corresponding levels of relaying, the second inputs are combined and are intended for connection to the output of the output unit, and outputs connected to inputs of the corresponding S-RS-triggers, R-inputs of which co 0 five 0 5 0 5 are connected with the second closing contact of the control key with a neutral position, and the outputs of the RS flip-flops are connected to the inputs of the corresponding first indicators and inverse inputs of the corresponding first elements I, the outputs of which are intended to be connected to the inputs of the measuring-logic blocks of the corresponding relay protection levels, are connected to the inputs the first OR element, the output of which is connected to the input of the second indicator, characterized in that, in order to increase reliability by detecting In addition, the third closing contact of the control key with neutral position, the second and third sources of the control signal with n outputs each and n second OR elements, are additionally introduced into the device, as well as to a failure in operation, as well as to unnecessary operations. the outputs of which are connected to the direct inputs of the corresponding first elements I, the first inputs are connected to the corresponding outputs of the second control signal source, and the second inputs are connected to the corresponding outputs the third The first control signal source with the neutral position of the first control contact is connected to the input of the second control signal source, and its third closing contact is connected to the input of the third source of the control signal.