SU913474A1 - Device for control of high-voltage switch - Google Patents

Description

The invention relates to control devices for high-voltage switches, disconnectors, as well as shunt devices of converter bridges.

A device for controlling a high-voltage switch is known, which contains the switch drive actuator contacts connected in series and the control switch actuator electromagnet coil included in the power thyristor circuits [1].

A disadvantage of this device is low reliability.

The closest in technical essence and the achieved result to the proposed is a device for controlling a high-voltage switch containing serially connected control coil of the actuator actuator of the switch, a thyristor connected to the power source, a switch actuator contact and a blanking unit (2).

The disadvantage of this device is the reduced reliability of the device due to the heavy current load of the contacts and the large power consumption .. in static mode.

2

The purpose of the invention is to increase reliability and reduce energy consumption.

- To achieve this Arrange GUSTs ⁵ provided with an additional thyristor, a resistor of the timing unit and three diodes, the first of which is incorporated antiparallel

10 to the control transition of the main thyristor, the second parallel to the transition of the anode - the cathode of the additional thyristor, the control electrode of which through a resistor is connected to the anode of the third diode, the cathode of which

15 is connected to the cathode of the main thyristor, a switch actuator contact is connected between the first cathode and the anode of the third diode, and the quenching unit is connected in parallel to the main

2θ thyristor through an additional thyristor, the control transition of which is connected to the output of the timing unit, the input of which is connected to the terminals of the control coil.

25 To increase reliability, the time-consuming unit is designed as a series-connected resistor and a capacitor, in parallel with which the series-connected ones are connected in parallel.

30 threshold-key element and primary3

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The main winding of the pulse transformer, the secondary winding of which is the output of the unit.

The drawing shows a diagram of the device to turn on the high-voltage switch.

The device contains a series-connected control coil 1 actuator actuator switch and the main thyristor 2, quench unit 3, additional thyristor 4, shunted by a diode 5, a resistor 6, switch actuator contact 7, separation diodes 8 and 9, and a time reference unit 10 connected in parallel with the coil 1 shunted by a diode 1.1. Block 10 consists of a resistor 12 and a capacitor 13, a threshold-key element of the dynistor 14 and a pulse transformer 15. The dynistor 14 is bridged by a diode 16 for removing the reverse voltage. The secondary winding of the transformer 15 is connected to the circuit 5 of the thyristor control 5 through a diode 17.

Unit 3 contains a capacitor 18 and an inductance 19. The device is connected to the power source 20.

When the switch is off, contact 7 is open. The capacitor 18 is charged to the voltage of the source 20 through the coil 1. When the signal "Turn on" to the control electrode of the thyristor 2 opens, and through the coil, 1 begins to flow, which causes the drive to operate and the switch to the on position 'while contact 7 is closed. The capacitor 18 begins to discharge through the open thyristor 2, diode 8, the closed contact 7, the resistor 6, the control electrode of the thyristor 4 and the inductance 19, which leads to unlocking of the thyristor 4 and overcharging the capacitor 13 to reverse voltage and further to locking the thyristor 2, since the discharge The capacitor is oscillatory. The thyristor 4 is also turned off, since a reverse voltage is applied to it, which is equal to the direct voltage drop across diode 5, and due to the locking of the thyristor. 2 current through the thyristor 4 and the current through, coil 1 is terminated.

The primary winding of the transformer 15 passes a pulse that co. the secondary winding is fed to the control electrode of the thyristor 4 and turns it on, which causes the activation of the quenching unit 5 and the switching off of the thyristor 2, as well as the thyristor 4 and the cessation of current in the coil 1.

The control device of the high-voltage switch also contains 10 * devices similar to that described for switching off the switch. The only difference between them is that the state of contact 7 in the switching device is opposite to that in the switching device ·.

This device has increased reliability and reduced energy consumption by 2θ.

Claims (2)

Claim 25 1. A device for controlling a high-voltage switch containing a control coil of the actuator of the switch actuator and a thyristor connected to a power source, a switch actuator contact and a quenching unit, in series, is different in order to increase reliability and reduce power consumption, it is equipped with an additional 55 thyristor, a resistor, a time reference unit, and three diodes, the first of which is turned on in parallel to the control transition of the main thyristor, the second - parallel For the transition, the anode is the cathode of an additional thyristor, the control electrode of which through a resistor is connected to the anode of the third diode, the cathode of which is connected to the cathode of the main thyristor, the switch actuator contact is connected between the first cathode and the anode of the third diode, and the quenching unit is connected parallel to the main thyristor through additional 5θ The target thyristor, the control transition of which is connected to the output of the timedating unit, the input of which is connected to the terminals of the control coil. Re-sending the command "Turn on" in the switch "On" position * does not cause a false response of the device, since the control electrode of the thyristor 2 is shunted by the closed contact 7 and diode 9. If the contact 7 fails for any reason, through the resistor 12, the capacitor 13 is charged to the voltage of the dynistor 14. In this case, 2. Device pop. 1, characterized in that, in order to improve reliability, the timing unit is made in the form of a series-connected resistor and capacitor, in parallel with which the series-connected threshold-key element and the primary winding of a pulse transformer are connected, the secondary winding of which 65 is the output of the block. five 913474 6