SU1504685A1 - Device for diagnosingdiscrete automation apparatus - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to devices for monitoring relay protection and emergency control automation. The purpose of the invention is to expand the scope, increase the reliability and reliability of the control. The goal is achieved in that the device allows the testing of protections responsive to current, voltage and phase angle. The device also serves to determine the parameters of the settings of the operation of the protection stages and to obtain data for constructing the phase characteristics of the protection. 1 il.

Description

The invention relates to electrical engineering, namely, relay protection and emergency control devices, and can be used to diagnose the technical condition of relay protection without removing it from work and without disconnecting the searched object. The chain of the invention is an extension of the use, an increase in the reliability of the H reliability of the control.

The drawing shows a functional diagram of this device.

The device contains a source of 1 signal, connected to the checked block 2 of relay protection with measuring bodies 3 and 4, shaper 5 of the compensating signal, element

6 signal delays, control key 7, trigger B, pilot signal source 9, AND element 10, block 11 for monitoring and display of the pilot signal, time delay block 12, switching unit 13. The device works as follows.

In the initial state, the control key 7 is open, the trigger 8 is reset. At the control unit, the input of the driver 5 of the compensating signal at the first input of the element AND 10 and at the output of the time delay block 12 is a signal prohibiting their operation. The source 9 of the control signal, designed to generate a signal Fj with a predetermined phase and linear-narisi4i

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| 1 amplitude, and the block 1 1 of fixation and display of the control signal is in the reset state, | The switching unit 13 is in a position where the electrical components of blocks 5 and 9 (the compensator and the source control signal) with elements of Block 2 of the tested protection is absent.

The signal F, which carries information about the state of the protected object, is formed at the source of signal 1 and is fed to the inputs of the measuring bodies 3 and 4 of the tested block 2. In these bodies 3 and 4, the incoming signal is analyzed and depending on its relationship with the settings at the output Block 2 of the protection being tested, an O or 1 signal is present. At the same time, this signal is present on. the input element 6 back-hold signal. Delayed in element 6, the signal at the first input of the imaging unit 5 compensating signal.

To monitor the control, the control key 7 is turned on. The trigger 8 is switched to the working state. The signal from the trigger arrives at the first input of the element 10 and prepares it for operation. The same signal I triggers the block 12 in the output of time I and enables the operation of the compensator signal generator 5. The signal shifted I in time, for example, at 20 ms of 50 Hz frequency, the present I at the input of the compensating signal generator 5 is also amplified through the switching unit 13 and fed to the input of the previously selected measuring unit 3 and 4 of the checked I protection 2 unit. The F signal of the normalizer, 5: of the compensating signal, being strictly out of phase with the signal F i of the signal source 1, compensates i in the selected measuring organ, while not disrupting the normal functioning of the other measuring bodies, of the tested protection unit 2. tizhenii full payment source 1 F, F. signal source is triggered by a control signal 9. The moment of launch is determined last time vscherzhkoy block 12 which is selected so that the time reference signal source 9 incorporating signal F, fully skompensirovals

signal F from the imaging unit 5. The source of the control signal 9 from the second output supplies the signal Fj to the second input of the AND element 10, which enables the operation of the block 11 for fixing and displaying the control signal. Simultaneously signal F ,. from the first output of the source 9 control signal

with a fixed phase and a linearly increasing amplitude enters the selected measuring unit of the tested relay protection unit 2, ijoTopoM compensates the signal F from source 1 and its

control (test) exposure brings the measuring body 3 or 4 to srabatshani. The response from the tested relay protection unit 2

arrives at the second input of trigger B, stops the operation of time block 12, which, in turn, prohibits the operation of the source 9j of the control signal. At the same time

the signal from the source 9 of the pilot signal, through the AND element 10, to the block 11 for latching and displaying the pilot signal is stopped. The latter displays the value

the control (test) action Fj, during which the testing of the measuring body 3 and 4 was triggered. The signal from the trigger 8 also interrupts the operation of the compensating signal generator 5. The signal from the control elements to the selected measuring body stops and it continues to analyze the signal coming from block 1.

In block 11 of fixation and display of the control signal, the parameters of the control signal F, are stored at which the measuring unit of the unit 2 of the tested relay operates.

protection. Comparison of the parameters of this signal with the parameters of operation of the measuring bodies of the relay protection allows drawing a conclusion about its technical condition.

If it is necessary to build the phase characteristic of the measuring body under test, the phase setting is changed / changed in block 9 (reference signal source) and the process of determining the response parameters is repeated as many times as necessary to build the phase response.

To carry out a diagnosis, another measuring unit 3 and 4 of the unit, the switch of the switching unit 13 should be set to the appropriate position and the diagnostics process should be repeated.

This device allows you to control phase-sensitive protection, increases the reliability and reliability of control due to a more accurate determination of the parameters of operation of the tested protection elements.

Claims (1)

Invention Formula Device diagnostics of discrete automation with a signal source and measuring bodies, containing a trigger, one input of which is connected to the control key, the second is intended to be connected to the outputs of the tested measuring bodies, the source of the control signal that is different from In order to expand the area of application, increase the reliability and reliability of the control, a signal delay element, a compensating signal generator, a time delay block, a fixation block and a display are added. and a pilot signal, an And element and a switching unit, while the trigger output is connected to the input of the time block, the first input of the compensator signal and the input of the And element, the output of the time delay block is connected to the second input of the And element via a source of the control signal, the output of which is connected with the output of the compensating signal generator and the input of the switching unit, the outputs of which are intended to be connected to the inputs of the measuring bodies of the checked equipment of the discrete automatics, the input of the delay element signal ki is intended for connection to the output of the signal source, and an output coupled to a second input of the compensating signal output elements TA and is connected to the pilot signal and fixing the display unit.