SU779933A1 - Device for sythetic testing of switches for switchability - Google Patents

Description

(54) DEVICE FOR SYNTHETIC TESTS OF WAXERS ON INCLUSIVE ABILITY

The invention relates to the field of electrical measuring equipment and can be used to create devices for testing the switching capacity of high voltage circuit breakers. A device is known for synthetic testing of circuit breakers for switching capacity, which contains a current loop with a series-connected voltage source, a controllable arc gap, and a test / breaker, a switch, a bypass voltage circuit, and a chain of series-connected capacitors and a resistor shunt by the igniter 1. A disadvantage of this device is the limited reliability of operation. The closest in technical essence is a device containing a circuit that includes series-connected alternating voltage sources, a resistor controlled by an arc gap with two electrodes, and a switch under test, in parallel with which is connected an auxiliary circuit that includes auxiliary voltage source and auxiliary resistor, a chain consisting of a series-connected capacitor and a resistor, shunted by an auxiliary th capacitor connected parallel to the switch under test, and the igniter device built in one of the electrodes of the arc gap controllably connected to the common point of the capacitor and resistor chain compound disadvantage of this device is the low accuracy and speed of inspection, and limited reliability. The aim of the invention is to improve the accuracy, reduce the testing time and increase the reliability of the device. To achieve this goal, a device for synthetic testing of switches for switching capacity, containing a circuit, including a series-connected alternating voltage source, a resistor, a controlled arc gap with two electrodes and a test switch, in parallel with which is an auxiliary circuit, including series-connected auxiliary voltage AC voltage and auxiliary resistor, a chain consisting of series-connected condens torus and resistor shunted by an additional capacitor, connected in parallel to the test switch, and the ignition device built into one of the electrodes of the controlled arc gap, connected to the common connection point of the capacitor and the resistor of the chain, is equipped with three additional capacitors, additional capacitors, an additional resistor, a reactor and an auxiliary switch connected by a parallel arc-controlled arc, parallel to which is connected Also connected in series are the first additional capacitor and reactor, as well as the second additional capacitor and additional resistor in series, shunted by the third additional capacitor, with the additional ignition device built into the other electrode of the controlled arc gap and connected to the common connection point of the second additional capacitor and additional resistor.

The drawing shows the functional electrical circuit of the device.

It contains a circuit 1, which includes a source of alternating voltage 2, a resistor 3, a controlled arc gap 4 with electrodes 5 and b, and a test switch 7, an auxiliary circuit 8, which includes an auxiliary source of temporary voltage 9 and an auxiliary resistor 10, a chain 11 consisting of a capacitor 12, a resistor 13 and an additional capacitor 14, the igniter 15, the auxiliary switch 16, the additional capacitors 17 18 and 19, the reactor 20, the additional resistor 21 and the additional igniter Property 22.

The device works as follows.

Before the start of testing, the switches 7 and 16 are turned off. The voltage from the alternating voltage source 9 creates a voltage across the auxiliary circuit 8 and the test switch 7.

The difference between the voltages of the circuit 8 and the circuit 1 is applied to the switch 16, the condensates 17 and 18, and the controlled arc gap 4. In the process of drawing the contacts of the test switch and the switch 7, they are subjected to an initial breakdown. Capacitor

17 begins to discharge to the test switch 7 through the reactor 20 and the resistance 3 of the circuit 1. Moreover, the inductance of the reactor 20 is chosen so that the time derivative of the high-frequency current corresponds to the derivative of the current in the total power circuit. Simultaneously with the capacitor 17, the capacitor 12 and the capacitor 18 also begin to discharge, creating a voltage drop across the resistors 13 and 21, causing the ignition devices 15 and 22 to break, embedded in the electrodes 6 and 5 of the controlled arc gap 4. The burning devices 15 and 22, by means of auxiliary capacitors 14 and 19, generate plasma flows, which tend towards each other. After ionization of the space between the electrodes 5 and 6 through the test switch 7 begins to pass the full test current from the circuit I.,. -

To reduce the erosion of the electrodes of the controlled arc gap 4 after 5-10 ms after the start of current flow, the auxiliary switch 16 is turned on. After a period of time to test the operation of the switch 7, sources 2 and 9 are turned off by safety switches (not shown).

If check of the switch 7 is required in a shut-off cycle, then before the start of the experiment, the switches 7 and 16 are turned on. After connecting the circuit 1 and the circuit 8 voltage through the test switch 7 begins to flow current, short circuit. Subsequently, the test switch 7 is disconnected and the voltage returned by the voltage of circuit 1 returns. During a dead pause, the auxiliary switch 16 is turned off and the circuit is set up to test the operation of the switch 7 in the switch-on operation. Further, the scheme works as indicated above. The current is switched off either by the test switch 7 or by the safety switches (not shown in the drawing).

Claims (2)

1. Authors certificate of the USSR 197754, cl. G 01 R 31/02, 1965. 2. Forward number 2679605/21, cl. G 01 R 31/02 dated 11/01/78, on which a decision was made to issue an author's certificate (prototype).