SU1525638A1 - Apparatus for testing switches for disconnection of capacitive current - Google Patents

Abstract

The invention relates to electrical engineering and can be used when testing high-voltage circuit breakers in the mode of switching off a capacitive load. The purpose of the invention is to increase the reliability of the tests of switches by compensating for the decrease in the amplitude of the restoring voltage. The device contains capacitor banks 1 and 2, switch on element 3, reactors 4,5,11, capacitors 7,12,17, disconnecting element 6, terminals 8.9 for connecting the test switch 10, resistors 13.14 contactor 15, source 19 constant Voltage with disconnector 16 and ground bus 18. Due to the introduction of capacitor 17 and the change in connection between the elements of the device, compensation of the amplitude of the restoring voltage is compensated and the distortion of the switched-off current is reduced. This increases the reliability of the test switches. 1 il.

Description

(21) i} 32205 / 24-21

(22) 10/27/87

(A6) 11/30/89. Bul No. 44

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

(72) V.I.Bronnikov

(53) 621.317.799 (088.8)

; (5b) USSR Author's Certificate No. 1359760, cl. G 01 R 31/02, 1987

(54) DEVICE FOR TESTING SWITCHES FOR CUTTING CURRENT CURRENT DISCHARGE (57) The invention relates to electrical engineering and can be used when testing high-voltage switches in the mode of switching off a capacitive load. The purpose of the invention is to increase the reliability of testing switches

by compensating for a decrease in the amplitude of the restoring voltage. The device contains capacitor banks 1 and 2, switch on element 3, reactors 4,5,11, capacitors 7,12,17, disconnecting element 6, terminals 8 and 9 for connecting test switch 10, resistors 13 and 14, switch 15, source 19 a constant voltage with disconnector 1b and a ground bus 18. By introducing a capacitor 17 and a change in connection between the elements of the device, compensation of the amplitude of the restoring voltage is compensated and the distortion of the disconnected current is reduced. This increases the reliability of the test switches. 1 il.

with

3 1525638 The invention relates to electro 10

15

20

technology, namely to the technology of testing High-voltage switches in the mode with | switching capacitive load.

The purpose of the invention is to increase the reliability of the tests of the switches by compensating for a decrease in the amplitude of Eustan's inflating voltage.

The drawing shows the electric circuit of the proposed device

The device contains a main capacitor battery 1, an additional capacitor battery 2, an Element 3, the first 4 and a second 5 reactors, a disconnecting element 6, the first (disconnecting) capacitor 7, the first 8 k second 9 terminals for connecting the tested switch 10, the reactor 11, reproducing network inductance, E; a secondary capacitor 12 and the first resistor 13 of the transitional voltage control circuit; The first resistor 1, the contactor 15, the third (auxiliary capacitor 1b, ground bus 17 and the source 18 is constant about voltage with disconnect- 19. Moreover, the first pins of the main n: capacitor battery 1, second director 5, disconnecting element b, with the switchable capacitor 7 and the source: a 18 constant voltage are connected by 4 ground bus 17 second the output of the reactor 5 is connected to the second output of the disconnecting element 6 and the first output of the reactor k, the second output of the reactor is connected to the first output of the element: i switch-on, the second output of which is connected to the first output of the additional capacitor battery 2, the second 40 terminals of the main 1 and an additional 2 Co. capacitor bank of batteries connected together and to a first terminal of the second contactor 5} output being disabled kondenUstroystvo operates as follows.

Before starting the tests, the test switch 10 and the tripping element 6 are turned on, and the switch-on element 3 and the lock 15 are turned off. From the source 18, the capacitor banks 1 and 2 and the capacitors 7 and 16 are charged to a voltage determined by the voltage class of the test switch 1 by the number of test breaks and the test mode, after which the source 18 is turned off. Then, a command is issued to shut off the test switch 10 and, after some time, a command is issued to turn on the switching element 3. After switching on the switching element 3, the voltage of the capacitor 16 is applied to the resistor Ik and, through the capacitor battery 2, to the circuit breaker 15s made in the form of a spark gap. The locking device 15 is punched by connecting a disconnected current circuit to

25 battery 1. Capacitor 1b, the capacity of which is on the order of less than the capacity of battery 1, is recharged before the voltage of this battery. If the ratio of the auxiliary and

3Q main battery is chosen equal to

C L Lo / C. X 2 - r- t- (p- + 1) -Sh L С -1 d LH С 01

where c

And С „

capacity of the main and auxiliary battery; disconnectable capacitor capacity; inductance of the first reactor;

inductance of the reproducing reactor

in the disconnected current, there will be no distortion caused by the transient setting of the current in the playback

 taTopa 7 is connected to terminal 8 for the sub-45 leading inductance of the network reactor.

0

five

0

40

The device works as follows.

Before testing, the test switch 10 and the tripping element 6 are turned on, and the switching on element 3 and the closing device 15 are turned off. From the source 18, the capacitor banks 1 and 2 and the capacitors 7 and 16 are charged to a voltage determined by the voltage class of the test switch 10, the number of breaks tested and the test mode, after which the source 18 is turned off. Then, a command is issued to turn off the test switch 10 and, after some time, a command is given to turn on the switching on element 3. After switching on the switching element 3, the voltage of the capacitor 16 is applied to the resistor Ik and through the capacitor bank 2 to the contactor 15s made in the form of a spark gap. The locking device 15 is punched by connecting a disconnected current circuit to

5 battery 1. Capacitor 1b, the capacity of which is on the order of less than the capacity of battery 1, is recharged before the voltage of this battery. If the ratio of the auxiliary tanks and

3Q main battery is chosen equal to

C L Lo / C. X 2 - r- t- (p- + 1) -Sh L С -1 d LH С 01

where c

And С „

capacity of the main and auxiliary battery; disconnectable capacitor capacity; inductance of the first reactor;

inductance of the reproducing reactor

in the switchable current there will be no distortion caused by the transient setting of the current in the playback

The key of the tested switch, terminal 9 is connected to the second output of Source 18. constant voltage And to the first terminals of the reactor 11 and the resistor 13, the second pin of which is connected to the first terminal of the capacitor 12, the second terminals of the reactor 11 and the capacitor 12 are connected to the first terminals a resistor 14 and an additional capacitor 1b and a second terminal of the closer 15, the second terminal of the condenser 1tor 1b is connected to the first terminal of the switching element 3 and the second terminal of the reactor A.

0

five

After the arc is cut off by the switch 10, the arc in the disconnecting element 6 is simultaneously extinguished due to active arc suppression (a fuse is usually used), as well as in the contactor 15 due to the fact that the voltage across it, representing the sum of the voltage of battery 2 and capacitor 1b, equals zero. The switch 10 on the side of the terminal 8 is affected by the constant voltage of the capacitor 7, and on the side of the terminal 9 by the voltage of the oscillating circuit with superimposed high-frequency 152

The oscillations determined by the reactor 11 and the transition voltage recovery circuit, consisting in this case of the capacitor 12 and the resistor 13. As the capacitor 1b is discharged, the voltage drop across the resistor And decreases, increasing the relative voltage on the switch 10 k the time of full discharge by the voltage of the battery 2, taking into account its attenuation. By permanently discharging the capacitor 16 ya, the resistance of the resistor k is chosen so as to ensure, by the time of the amplitude of the restoring voltage, an appropriate compensation for the damping of the voltage of the oscillating circuit.

Thus, the changes made in connection with the elements of the device, the introduction of an auxiliary capacitor and the corresponding choice of circuit parameters allow to compensate for the reduction due to the active loss of the amplitude of the voltage being restored at the tested switch and reduce the distortion of the current to be switched off.

Claims (1)

Invention Formula A device for testing switches for switching off capacitive current, containing the main and auxiliary capacitor banks, the switch-on element, the first, second and third reactors, the disconnecting element, the switch to be tested, the first and second capacitors, the first and second terminals for connecting the switch to be tested, the first and the second resistors, the circuit breaker, the constant voltage source with the disconnector and the ground bus, 1525638 oh, one ns- 15 ui five 0 0 five 0 five Q connected to the first terminals of the second reactor and the disconnecting element, the first plates of the main capacitor bank and the first capacitor and the first terminal of the constant voltage source, the second terminal of which is connected to the first terminal for connecting the test switch and the first terminal of the third reactor, the second terminal of which is connected to the first the lining of the second capacitor and the first output of the circuit breaker, the second output of which is connected to the second facing of the main capacitor battery, and the second terminals of the second The first reactor and the disconnecting element are connected to the first output of the first reactor, the second output of which is connected to the first output of the switching element, the second output of which is connected to the first plate of the additional capacitor battery, and the second cover of the second capacitor is connected to the first output of the first resistor, and the second terminals for connecting the test switch is connected to the second plate of the first capacitor, characterized in that, in order to increase the reliability of the tests, it is additionally inserted into it The first capacitor, the first plate of which is connected to the second output of the first reactor, and the second plate of the third capacitor is connected to the first plate of the second capacitor and the first output of the second resistor, the second terminal of which is connected to the first plate of an additional capacitor battery, the second plate of which is connected to the second plate of the main capacitor battery, and the second output of the first resistor is connected to the first output of the third reactor.