SU1365166A1 - Device for arc-shaping of contacts of vacuum arc chute - Google Patents

Abstract

The invention relates to electrical engineering and can be used in devices for arc-forming contacts of vacuum arc chambers (VDK). The purpose of the invention is to increase the reliability of the device. The device contains a charging device 1, a capacitive energy storage device 2 connected in parallel with it, inductors 3, two VDC 4 and 5 connected in series to the C-circuit, current-limiting resistors 6 and 7, and controlled thyristors 8 and 9. VDC 4 and 5 is connected to the actuator 10. A trigger pulse is applied to the control electrode of the thyristor 8. After tripping, the thyristor 8 opens and starts discharging capacitor 2 through a resistor 6, VDK 5 and inductance 3. After the current in control circuit 11 is established, a signal is applied to the drive 10. VDC 5 contacts are consumed for a predetermined distance in the gap, an arc with a current of about 100 A is lit. When current flows in the circuit through zero values, the arc in the contact gap of the VDK 5 goes out, and the voltage recovery at the contacts begins. At this point, the processing cycle of contacts VDK 5 ends, and the contacts VDA 4 are processed. 2 Il. i (L

Description

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The invention relates to electrical engineering, specifically, to the technology of manufacturing vacuum arc suppression chambers.

The purpose of the invention is to increase reliability and efficiency.

FIG. I is a schematic diagram of the device; in fig. 2 - time diagram of his work.

The device consists of a charging device 1, a capacitive energy storage capacitor 2 connected to it in parallel, an inductance coil 3, two vacuum arcing chambers (VDC) 4 and 5 connected in series to an LC circuit, then co-limiting resistors 6 and 7 and controlled thyristors 8 and 9, connected in parallel to each VDK, VDK 4 and 5 are connected to the actuator 10, and the contacts VDK 5 are closed, and VDK 4 are open. Drive 10 and thyristors 8 and 9 are controlled by QO of control circuit 11.

The device works as follows.

With the aid of charging device 1, a capacitive energy storage device — a battery of capacitors 2 — is charged to the required voltage level. At time t, the thyristor 8 opens and the discharge of the capacitor 2 through the resistor 6, the closed contacts VDK 5, the inductance 3 begins at the control electrode. The resistance of the resistors 6 and 7 is chosen so that at the lowest voltage of the capacitor 2 to provide a current of at least 100 A in the circuit. After the thyristor 8 is triggered and a control circuit 11 is installed, a signal is sent to the actuator 10, which opens the VDC 5. at the time t, the VDC 5 contacts dissipate by specified distance and mezhkontakt- gap SG arc burns with a current of about 10 A, ensuring stable combustion vacuum arc for a long time.

Synchronously with the movement of the VDK 5 contacts for disconnection due to the mechanical connection, the VDA 4 contacts move to turn on, and at time 13 the VDC 4 contacts are closed, shunting the circuit of the resistor 6 and the thyristor 8. In the circuit, the discharge of the capacitor 2 along the circuit begins : VDK 4

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VDK 5, inductance 3, which provides passage through divorced contacts of VDK 5 current pulses of a given amplitude and conducting degassing of contacts.

At time t. the current in the circuit passes through a zero value, the arc in the contact gap VDK 5 goes out and the voltage recovery begins at the contacts with an amplitude having a voltage of not more than double charge.

At this point, the processing cycle contacts VDK 5 ends.

At the end of the cycle, the capacitor battery 2 is recharged and has a polarity opposite to the original one. After it is charged up to the required magnitude of the charging voltage Uj, a signal is sent to start the thyristor 9 and the processing cycle is repeated, but now the VDC 4 contacts are processed.

The use of the invention will improve the reliability of the device by using a vacuum interrupter chamber as a switch, as well as increase labor productivity due to the simultaneous formation of an introduced additional vacuum interrupter chamber.

Claims (1)

Invention Formula A device for arc-forming contacts of vacuum arc extinguishing chambers containing a charging device, a capacitive energy storage device, an inductance coil, a drive, a control circuit, a switchboard, a vacuum arc extinguishing chamber with movable and fixed contacts, characterized in that, in order to increase reliability and efficiency, in addition A vacuum arc-suppressing chamber is introduced, connected in series in a circuit of a capacitive storage ring and an inductor, and the moving contacts of both chambers are interlocked between The chain of resistor and thyristor connected in series is connected in parallel with each drive, each of the chambers, the control elements of each of which are connected to the control circuit.