SU1597958A1 - Device for checking operability of relay protection components - Google Patents

Abstract

The invention relates to electrical engineering and can be used to automate the verification of relay protection. The purpose of the invention is to increase reliability, reduce testing time and expand functionality. The operation of the device consists in supplying test signals to the inputs of the elements to be tested from the source of control signals and comparing, using logic elements, the reaction of these elements and their repeaters to these signals. 1 il.

Description

The invention relates to electrical engineering and can be used in the construction of an automatic device for checking the health of semiconductor elements of zero-indicators of rectifying bridges, etc.

The aim of the invention is to increase reliability, reduce testing time and increase functionality.

The drawing shows a diagram of the device for checking the health of the elements of relay protection.

The device contains a transformer 1 with one primary winding 2 connected to the supply voltage (220 V, 50 Hz) via button 3 (without latching the on position), and three secondary windings 4-6; a voltage generating unit 7 for supplying the semiconductor elements of the testing device, a null indicator circuit and test signals with a switch 8 connected to one of the secondary windings 4, which allows to input test signals of different polarity to the input of the tested zero indicator and device; test signal generation circuit 9 for IBM and 2VM rectifier bridges, connected to another secondary winding 5 and consisting of a current limiting resistor and switch 10, allowing the test signal to be fed alternately to each of the rectifier bridges (IBM, 2BM) ; a block 11 for monitoring the health of rectifying bridges, consisting of a low-pass filter on the operational amplifier 12, a Schmitt trigger for amplification / 1e 13, and a unit for generating a reference signal connected to the third secondary winding 6 of the transformer 1; block 14 of repeaters of test and control signals (coming from the outputs of the semiconductor elements of zero-indicators), containing four operational amplifiers 15-18 in the inverting turn-on, operating in the zero-organ mode; logic unit 19, which implements a given logical function and is built on the elements AND-NOT 20-33, alarm unit 34, containing amplifiers on transistors and LEDs 35-38 included in the emitter

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chains of these transistors; a key 39 (switch) for selecting the type of a tested null indicator; a connector 40 for connecting a tested null indicator.

The zero-organs made on the operational amplifiers 15-18, together with the coupling diodes and resistive dividers connected at their outputs, are intended to form logic signals characterizing the value of the test signals of block 7 and the control signals coming from the outputs of the elements The first and second null indicators (connected to terminals 41 and 42 of connector 40), the output transistor collector (connected to terminal 43 through the switch 39), and the matching of the values are formed. Logical signals with permissible values of the input signals of the logic elements of block 19. In addition, block 14 eliminates the influence of the checking device on the elements of the checked null indicator.

Logic block 19 checks the compliance of control signals from the outputs of the elements of the tested null indicator and the output transistor with the test signal. If there is a match on the alarm unit 34, the LED 35 is on. "OK. In the event of a malfunction, the LED "OK" goes off and the LED indicating the faulty element is lit.

After connecting the tested null indicator to connector 40 and supplying power by button 3, test signals removed from diodes 44 (positive polarity - logical unit) and 45 (negative polarity - logical zero-) with the help of a toggle switch 8 ("Operation-Failure ) are alternately fed to the input of the tested null indicator (via terminal 46 of connector 40), as well as to the input of the comparator 15. At the outputs of the comparators 16-18 there are logical signals characterizing the state of the outputs of the operational amplifiers of the zero indicator and collector one transistor. The signals from amplifiers 16 and 18 are compared with the signal from amplifier 15 according to the “Equivalence” scheme, i.e. a logical unit is present at the outputs of elements 25 and 33 if the logic signals at the outputs of the comparators 15, 16 and 18 are inverse to each other at both switch positions 8 .

The output signals of the amplifiers 15 and 17 are compared according to the Equivalence scheme, i.e., and the output of element 29 is a lo-physical unit if the logical signals at the outputs of these comparators are the same for both positions of switch 8, if Hy.ih indicator is good, then at any position of the toggle switch 8 (“Tripping or

"Failure) at the outputs of the elements 25 and 33 there are logical units, and at the output of the element 21 - a logical zero, which causes the LED 35 to glow

“Normally, a null-indicator indicating the operability. If the output state of any active element does not correspond to the value of the test signal applied to the input of the null indicator, then

the corresponding outputs of elements 25, 29, or 33 in TC are logical zeros, which will cause the corresponding diodes 36-38 to glow, indicating that the elements of the zero-indicator circuit are faulty. Simultaneous appearance of a logical zero hot

at one input of element 21 leads to the appearance of a logical unit at its output and the LED goes out “OK.

The switch 39 ensures the correct operation of the test circuit depending

on the type of null indicator being tested (upper position without output transistor, lower position with output transistor).

The rectifying bridge recirculation health check unit 11 is made using operating accelerators 12 and 13. Rectified by the rectifying rectifier bridges, the voltage through the first-order low-pass filter performed on the operational amplifier 12 is applied to the first

the trigger input, Schmitt, made on the operational amplifier 13, to the second input of which the reference voltage is received, obtained from the winding 6 of the power transformer 1 through a full-wave rectifier with a storage capacitor 47.

The reference voltage is selected so that when at least one of the half-waves rectified by the rectifying rectifier bridge voltage decreases by more than 20%, the Schmitt trigger 13 triggers. This causes the LED 48 to go off and the LED 35 goes out. . The rectifier bridges to be tested are connected to a sinusoidal test voltage source (winding 5 of the transformer

power supply with current-limiting resistor) alternately switch 10.

The technical and economic efficiency of the invention is determined by a significant reduction in labor costs for carrying out a health check and the possibility of performing this check by low-skilled personnel.

Claims (1)

Invention Formula A device for testing the health of relay protection elements, comprising a test signal generating unit, a test signal switch, a logic unit, and an alarm unit, characterized In order to increase reliability, reduce testing time and expand functionality, a repeater unit of test signals was additionally introduced, a switch for selecting the type of null indicator to be checked, a rectifier bridge test signal generating unit with a switch, a rectifier bridge health monitoring unit and a connector for connecting to the tested protection, while the output of the block forming the test signals of rectifying bridges is connected to a switch with terminals for connecting to the input One of the rectifying bridges to be tested, the first input of the test signal repeater unit is connected to the moving contact of the test signal switch and is intended for connection to the inputs of the tested null indicators, the second input of the repeater unit is connected to the first fixed contact of the test signal switch and is intended to be connected to the output the first checked null indicator, the third input of the repeater unit is designed to be connected to the output of the second checked null indicator, the second fixed coil The clock of the test signals is connected via a current limiting resistor to the key power bus and is intended to be connected to the collector of the output transistor, the first to the fourth outputs of the repetition unit are connected respectively to the same inputs of the logic unit, and the first to the fourth outputs of the logical unit are connected respectively from the second to the right by the inputs of the alarm unit. 0 I.:; pf J M 11 Tr 2206 :; 5 pf M 11 spravias ffO paSm cnpaSwcm 10U  Hei sleepability 20U  spranos / tl