SU1350692A1 - A.c.high-voltage switch - Google Patents

Abstract

The invention relates to the field of electrical engineering, in particular to high-voltage AC switches. The purpose of the invention is to increase reliability and reduce the cost of the switch. In the switch, the main contacts 1, contacts 2 of the separator, controlled by the drive 3, are connected in parallel to the thyristor unit 4 with the control unit 5. The resistor 6 and the thyristor switching element 7 are connected in parallel and connected in parallel to the main contacts 1 via the additionally entered contacts 9 with the drive 10, and the inputs of the drive 10 and the control unit 8 are connected to the outputs of the operating control unit 11. 1 sludge. € (L DO CL E

Description

The invention relates to the field of electrical engineering and can be used mainly in high-power high-voltage switchgears.

The purpose of the invention is to increase the reliability and reduce the cost of the switch.

The drawing shows the circuit diagram of the switch.

The switch contains serially connected main contacts 1 and contacts 2 of the separator, controlled by ОДШ1М 3, sub1: closed. parallel to the main contacts is a thyristor node 4 of antiparallel-connected chains of serially connected transistors with a control unit 5, a resistor 6 and a thyristor switching element 7, connected on the basis of two anti-parallel thyristors connected in parallel, the control unit 8

15

20

The tiring element is locked and a resistor is turned on in the auxiliary contacts. As the current increases, the voltage drops across the resistor increase and conditions are created to turn on the thyristor node A. The current flows into the thyristor node at the beginning of the half period. After this, additional contacts 9 are opened, and then, when the thyroid node is turned off at the end of the half-period, contacts 2 are disconnected.

The use of the invention makes it possible to reduce the cost of switches due to a decrease in the number of thyristors per switch) by the overall element (up to one thyristor in each direction of the current and a substantial simplification of the control circuit, by them. At the same time, this leads to an increase in the reliability of the switch. Bypassing the thyristor switching element of the resistor

a switching element, in addition to the 25 interval current discharge from the main

Direct contacts 9 with the drive Yu, unit 1 I operational control switch, the outputs of which are connected to the common drive 3 -contacts 1 and 2 of the main circuit, unit 5 controlling the thyristor node, unit 8 controlling the switching element and the drive IO of the auxiliary contacts.

The switch works as follows. .

 When the position is on, the main contacts 1, contacts 2 of the separator, additional contacts 9 are closed, the thyristor node 4 and the thyristor switching. item 7 locked. The main part of the current flows through the main contacts and separator contacts. In the shunt resistor circuit, it is less than 0.01%. When disconnected from the operational control unit 11, commands are sent to the drive 3 of the main contacts} and contacts 2 of the separator, the control unit 8 of the thyristor switching element 7, the control unit 5 of the thyristor node 4 and the drive 10 of the additional contacts 9. As a result, the main contacts are opened. The current passes to the circuit of additional contacts 9 through the switched on thyristor switching element 7, which shunts the resistor 6.

 When changing the direction of the current on the reverse conduction of the thyristor

five

0

The tapering element is locked and a resistor is turned on in the auxiliary contact circuit. As the current increases, the voltage drop across the resistor increases and conditions are created to turn on the thyristor node A. The current flows into the thyristor node at the beginning of the half period. After that, additional contacts 9 are opened, and then, when the thyristor node is turned off at the end of the current half-cycle, contacts 2 of the separator are opened.

The use of the invention allows to reduce the cost of the switch by reducing the number of thyristors per switch) by the overall element (up to one thyristor in each direction of the current) and by significantly simplifying the control circuitry. At the same time, this leads to an increase in the reliability of the switch. Shunting thyristor switching element resistor in.

five

contacts allows to reduce the impact on them of the arc and, consequently, increase the resource of their work. The additional contacts of the switch-Q bodies open with virtually no current and therefore they do not have a significant effect on the service life of the switch as a whole. As a result of an increase in the switching resource of the switch, the number of plans for preventive repair work is reduced, which gives an economic effect during its operation.

Claims (1)

Formula of invention AC high-voltage circuit breaker containing serially connected main contacts and contacts of a separator with a common drive, a thyristor node from oppositely connected in parallel chains of series-connected thyristors connected in parallel to the main contacts, an operational control unit connected by its outputs to the common contact drive and the thyristor node control unit , a resistor and a thyristor switching element g with its control unit, characterized in that, in order to increase over zhnosti and reduce cost, the resistor and thyristor switching element therein five 0 31350692. The connections between each other in parallel and the drive and the control unit are connected in parallel by the main connecting element to other measures through the additional inputs of the operational control unit and the drive, but the inputs are not.