SU847394A1 - Device for testing relay phase-wise comparing circuits - Google Patents

Description

The invention relates to electrical measuring equipment and can be used to create devices for diagnosing devices for relay protection and automation of power systems. A device for testing relay phase comparison circuits is known, which contains a drum with group contacts and a 1 J motor. A disadvantage of this device is the inability to study the time stability of the test systems hargisterists. The device closest to the technical essence is the control input of which is connected to the output of 1 frequency error block, and the output to one of the input of the tested relay comparison circuit in phase, and the source for periodic control actions, the control of which input is connected to the output of the task time block, and the output to another input of the tested relay cx phase 2 comparison. The disadvantage of this device is also the impossibility of measuring the SUSTAINABILITY in time of the characteristics of the test circuits. The purpose of the invention is to increase the speed and make it possible to measure the stability in time of the characteristics of relay phase comparison circuits. To achieve this goal, a device for testing phase-matching relay circuits / containing a source of control actions, a control input of which is connected to the output of the variance unit in frequency, and an output with one of the inputs of the phase comparison relay tested, and The utvall input of which is connected — with the output of the unit for setting the test time, and the output — with another input of the relayed phase comparison, supplied with an auxiliary switch. pulses, a block of logic elements and pulse counters according to the number of outputs of the tested relay comparison circuit in phase, while the inputs of the auxiliary pulse generator are connected respectively to the outputs of the source of control actions and the source of periodic control actions; the corresponding inputs of the block of logic elements, the outputs of which are connected to the inputs of the corresponding pulse counters.

In addition, to achieve this goal, the auxiliary pulse shaper is made on the basis of the phase unequality control unit with the work zone setting element

The drawing shows a block diagram of the proposed device.

The device contains a source of 1 control actions with a frequency error block 2, a tested phase comparison circuit 3, a driver (block) 4 auxiliary pulses, a source 5 of periodic control actions with a block 6 of test time, a block 7 of logic elements and counters 8, 9 and 10 pulses.

The device works as follows.

Prior to testing, source 5 is disabled by block 6, the device is not working.

Before testing, unit 2 sets the difference in frequency of source 1 signals from source 5, the unit for setting the working zone in angle is the formation zone for unit 4 auxiliary (exemplary) pulses, unit 7 is the character counted by each of the counters.8, 9, 10 pulses, t . monitored reliability component, unit b — total test time. After switching on the block b, a continuous change occurs in the mutual phase angle of the pulses fed to the circuit 3 and the driver 4; The rate of change of the angle is determined by the difference hour-to-go, given by block 2. Block 4 generates auxiliary pulses corresponding to the reference moments of the correct operation of the circuit under test, counter 8 counts their number. By choosing the logic of block 7, counter 9 is intended to count the correct operation of circuit 3, the counter 10 wrong triggers. After the expiration of the test time, the elements, bcc; 1, are terminated and cease operation: installations. The number of failures in time is determined by the difference in the readings of counters 8 and 9.

The proposed device allows, in a short period of time, to check the stability of the performance characteristics of phase-sensitive circuits in time, i.e. failure rates per unit of time, the number of time between failures and other quantitative parameters of reliability.

Claims (2)

1. A device for testing relay phase comparison circuits containing a source of control actions whose control input is connected with the output of the error block in frequency, and the output with one of the inputs of the tested relay comparison circuit in phase, and the source of periodic control actions, the control input of which is connected to the output of the test time setting block, and the output with another input of the tested relay comparison circuit in phase, differing from the fact that, in order to increase speed and ensure the possibility of measuring the stability in time of the characteristics of the relay comparison circuits, it is equipped with an auxiliary pulse driver, a block of logic elements and pulse counters according to the number of outputs of the tested relay circuit of phase comparison, when ems, the inputs of the auxiliary pulse generator are connected respectively to the outputs of the source of control actions and the source of periodically controlled actions, and its output and outputs of the test relay circuit of phase comparison are connected to the corresponding inputs of the unit logical elements, the outputs of which are connected to the inputs of the corresponding impulse counters. 2. The device according to claim 1, that is, so that the driver of the auxiliary pulses is made on the basis of the control unit of unequal phases with the task element of the working zone in angle. Sources of information taken into account in the examination 1. Device for testing the interaction of the automation of the termination of the asynchronous stroke (APAH). TsNTI, Perm, 55 Il No. 214-74. 2. USSR Author's Certificate No. 598154, cl. H 01 H 69/01, G 01 R 23/00, 1976 (prototype).