SU1359760A1 - Device for testing switches for cutting off capacitive current - Google Patents

Abstract

The invention relates to electrical test equipment and can be used to test high-power electrical switches for switching off capacitive current. The purpose of the invention is to increase the reliability of the test results by adjusting their conditions to the real conditions of the test switch. For this purpose, a capacitor battery 17, a resistor 13 and a contactor 12 are additionally introduced into the device. In addition, the device contains a capacitor battery 1, element 2, switch on reactors 3 and 4, disconnecting the element 5, simulating a capacitor 6, testing switch 7, reproducing the reactor 8, the resistor 9 and the capacitor 10 of the chain for regulating the restoring voltage, the source 11, terminals 14 and 15, the ground bus 16. In the device, through the half-cycle of the industrial frequency, the battery 1 is recharged to the opposite polarity, and the amplitude of the restoring voltage is applied to the test switch 7, equal to the sum. voltage on battery 1 and capacitor 6. 1 Cp f-ly, 1 ill. from U) g SAE SP with O)

Description

The invention relates to electrical test technology and can be used to test high-power electrical switches for switching off capacitive current.

The aim of the invention is to increase the reliability of the test results by bringing their conditions to the real conditions of the switch under test.

The drawing shows an electrical diagram of the device.

In the drawing, the following designations are accepted: main capacitor battery 1, switch on element 2, first 3 and second 4 reactors J disconnecting element 5 simulating the capacitor 6 test switch 7, reproducing -reactor 8, resistor 9 and chain capacitor 10 for adjusting the restoring voltage, DC source 11, contactor 12, resistor 13, first

14 and 15 terminals for connecting the test switch, the ground bus 16 and the auxiliary capacitor battery 17, the first terminal of the reactor 3 is connected to the first terminals of the reactor 4 and the disconnecting element 5, the second terminal of which is connected to the first terminals of the battery 1, the capacitor 6 and the source 11, the second output of the reactor 4 and the bus

16, the second lead of the reactor 3 is connected to the first lead of the switching element 2, the second lead of which is connected to the first leads of the reactor 8 and the resistor 9, the second lead of which is connected to the first lead of the capacitor 10, the second lead of which is connected to the second leads of the reactor 8 , source 11 and with terminal 14, terminal

15 is connected to the second lead of the capacitor 6, the first leads of the battery 17 45 Battery 1 continues to be recharged

and the contactor 12 is connected to the second terminal of the switching element 2, the second terminal of the battery is connected to the first terminal of the resistor 13, the second terminal of which is connected to the second terminals of the battery 1 and the contactor 12.

The device works as follows.

Before starting the test

through the reactor 3 and the reactor 4 that turned on after the current zero. A transient, reducing voltage applied to the voltage of battery 1, 50 of which is proportional to the speed of current approach to zero and the inductance of the reactor 8. Through a half-cycle of industrial frequency, the capacitor battery 1 is recharged

the switch 7 and the disconnecting element 5 55 TO the opposite polarity and to the test are switched on, and the switching elements 2 and the contactor 12 are turned off. From source 11, battery 1 and capacitor 6 are charged to the same voltage.

0

five

0

five

After charging battery 1 and condensate. 6 to a predetermined voltage determined by the class of the voltage of the test switch 7, the number of races tested and the test mode, the source 11 is turned off. Then, a command is issued to disconnect the test switch 7n and after some time, to turn on the switching-on elements 2 and the closure 12, both of which operate either simultaneously, or some delay in the operation of the element 2 in relation to the closure 12 is provided. Battery 1 its resistance can vary widely, and when switched on between the contactor 12 and the battery 1, it must be chosen so that during the discharge of the battery 17 bypassed by it 17 the current in the switch 7 n I would have had time to noticeably increase.

If the proportion of capacitors, shunt-contactor 12 and a resistor

13, is - ce, L - from

N

and

J

thirty

35

40

the number of capacitors of batteries 1 and 17, the high-frequency component of the current in the switch is zero (where and, is the charging voltage; L is the reactor inductance 8; 1 and CO, the amplitude and angular frequency of the first harmonic of the current). The voltage across battery 1 and capacitor 6 varies in time also without additional high frequency harmonics.

After disconnecting the capacitive current switch 7 to the capacitor 6, the voltage remains equal to the sum of the voltages on the battery 1 and on the reactor 8 at the moment of current interruption.

through the reactor 3 and the current 4 turned on after the current zero. The voltage of the battery 1 is superimposed by a transient, regenerative voltage, whose magnitude is proportional to the speed of current approach to zero and the inductance of the reactor 8. After half of the industrial frequency, the capacitor battery 1 is recharged

The switch 7 is applied with the amplitude of the restoring voltage equal to the sum of the voltages on the battery 1 and the capacitor 6.

Claims (2)

1. A device for testing switch-disconnectors for capacitive current, containing a main capacitor battery, switch on element, first rt second reactor, disconnecting element, reactor reproducing chain of control voltage restoring voltage, simulating a capacitor, source of constant voltage, two terminals for connecting the test switch and the ground bus; the first terminal of the first reactor is connected to the first terminals of the second reactor and the disconnecting element, the second terminal of which is connected to the first As the voltages of the main capacitor battery simulating a capacitor and a constant voltage source, the second terminal of the second reactor and the grounding bus, the second terminal of the first reactor is connected to the first terminal of the firing element, the second terminal of which is connected to the first pins of the reproducing reactor and the reducing chain voltage, the second terminal of which is connected to the second terminals of the reproducing reactor and the DC source and to the first terminal for connecting the test Editor T. Parfenova Order 6152/49 Compiled by A. JIpzhebelsky Tehred A. Kravchuk Proofreader M. Demchik Circulation 730 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4  N. switch, the second terminal for connecting the test switch is connected to. A second terminal of the simulating capacitor, characterized in that, in order to increase the reliability of the test results, an additional capacitor battery, a resistor and a contactor are inserted in it, the first terminals of the additional capacitor battery and the contactor are connected to the second terminal of the switching element, the second terminal of the additional capacitor battery is connected the first terminal of the resistor, the second terminal of which is connected to the second terminals of the main capacitor battery and the circuit breaker. 2. The device according to claim 1, wherein the number of sections of the additional capacitor battery N is determined by the formula N. N- CO, de 1, and o, t I mi 7 the amplitude and frequency of the first harmonic of the test current; charge voltage; Inductance of the reproducing reactor.