SU789917A1 - Apparatus for synthetic testing of switch-overs by switching-on capability - Google Patents

Description

The invention relates to the field of electrical engineering and can be used to create devices for testing the switching ability of high-voltage switches.

A device for measuring the recovering strength of high voltage circuit breakers, comprising a current loop with a reactor, a test and auxiliary switches and an AC voltage source, a high voltage pulse probing generator and a short circuit with a saturation inductor and a spark gap [1].

The disadvantage of this device is its complexity and low reliability.

The closest in technical essence is a device containing a current circuit, including an AC voltage source, a controlled arc gap with two electrodes and a test switch, in parallel with which a voltage circuit is connected and a capacitor and resistor connected in series, the common connection point of which is connected to the ignition. 30 melting device, built into one of the electrodes of the controlled arc gap [2}.

The disadvantage of this device is the low accuracy due to the low test power, low reliability and complexity of operation, due to the presence of an independent voltage circuit.

The aim of the invention is to improve accuracy, simplify operating conditions and increase the reliability of the device.

This goal is achieved by i5 that the known device for synthetic testing of circuit breakers for switching capacity, containing a current circuit, including an AC voltage source, a controlled arc gap with two electrodes and a test switch, in parallel with which a voltage circuit is connected and a capacitor and resistor connected in series , 25 the common point of connection of which is connected to the ignition device, built into one of the electrodes of the controlled arc gap, is equipped with olnitelnym capacitor "!, connected parallel to the resistor.

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In addition, the device is equipped with an additional resistor, the current circuit is made according to the double transformation scheme with step-up and step-down transformers, while the output of the secondary winding of the step-up transformer is connected through the Additional resistor to the input of the tested switch, and the step-down transformer is made in the form of an autotransformer.

The drawing shows a functional electrical diagram of the device. It contains a current loop 1, including an AC voltage source 2, step-up transformer 3, step-down transformer 4, made according to the autotransformation circuit, test switch 5, controlled by arc gaps b with electrodes 7 and 8, voltage circuit 9 with additional resistor 10, resistor 11, capacitor 12, optional. capacitor 13 and ignition device 14.

The device operates as follows.

The required test voltage is applied to the test switch; 5 from the voltage loop 9. In the process of rapprochement of the contacts of the switch 5, their preliminary breakdown occurs. The capacitor 12 begins to discharge to the test switch 5 through the resistor 11 and the capacitor 13, creating a voltage drop on them, leading to a breakdown of the air gap in the ignition device 14. The additional capacitor 13 largely contributes to the efficiency of plasma generation, which increases the amount of energy supplied to the arc burning in the ignition device 14. This allows ionization of the longer air gap, which increases the reliability of the controlled arc gap 6 and the entire circuit. After ionization of the space between the electrodes 7 and 8 through the test interval b switch 5 starts to pass the full test current from the loop current Io 1. After neobxojtuiivioro to verify operability switch 5 operation circuit 1 on-time voltage and current circuit 9 disables liminary mogtelnymi apparatus ¹ ( not proven in the drawing).

The use of a double transformation current circuit 1 simplifies the operating conditions since an up-step transformer 3 is used for current circuit 1 and voltage circuit 9, which also reduces the amount of equipment needed for testing.

The implementation of a step-down transformer 4 according to the autotransformation scheme leads to an increase in test power.

Claims (2)

Claim J5 1. Device for synthetic testing of circuit breakers for a full capacity, containing a current loop, including an AC voltage source controlled by 20 An arc gap with two electrodes and a test switch, in parallel with which a voltage circuit is connected and a capacitor and a resistor connected in series, the common connection point of which is connected to an ignition device built into one of the electrodes of the controlled arc gap, characterized in that, with the purpose of increasing'-accuracy, simplification 3 operating conditions and improve the reliability of the device, it is equipped with an additional capacitor connected in parallel with the resistor. 35 2. The device according to π. 1, characterized in that it is equipped with an additional resistor, and the current circuit is made according to the double transformation scheme with step-up and step-down transformers, while the output of the secondary winding of the step-up transformer is connected through an additional resistor to the input of the switch under test. ’ 3. The device according to p. 1 and 2, characterized in that the step-down transformer is made in the form of an autotransformer. 5θ Sources of information taken into account in the examination 1. USSR copyright certificate No. 474772, cl. G01R 31/02, 1975. 2. Copyright certificate of the USSR "197754, cl. G01R 31/02, 1965 55 (prototype). L VNIIIPI Order 9034/46 Circulation 1019 Subscription Branch of PPPPatent, Uzhhorod, Project 4,