SU1292103A1 - Device for locking switch with automatic reclosing against multiple switching-in - Google Patents

Abstract

The invention relates to devices for blocking from repeated switching on of switches with automatic reclosing, in particular for devices for blocking high-voltage vacuum switches. The aim of the invention is to increase reliability. This goal is achieved by introducing into the relay device a minimum voltage 1 connected to a source of dependent power through a resistor 3, the disconnecting contact 10 of the relay is connected in parallel to the disconnecting contact 11 of the intermediate relay 6. This allows you to block multiple switch-on connections on short-circuit currents with a long decrease in the voltage in the auxiliary circuit breaker. 1 il. with

Description

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The invention relates to interlocking devices from repeated switching on of switches with automatic reclosing, in particular to devices for blocking high-voltage vacuum switches.

The purpose of the invention is to increase reliability.

The drawing shows a schematic diagram of the device.

The device contains a minimum voltage relay coil connected to the first output of the dependent power supply 2 through a series-connected third resistor 3 and the first outputs of control key contacts 4, automatic reclosing contacts 5 (AR) and the first winding terminal of the intermediate relay 6, the second output of which It is connected to the second output of the source 2 of the dependent power supply through the series-connected resistors of the first 7, second 8 and disconnecting auxiliary contact 9 of the switch. Through a parallel-connected first disconnecting contact 10 of the undervoltage relay and its disconnecting contact 11, the coil of the intermediate relay 6 is connected in parallel with the control switch pins 4 and contacts 5 of the automatic recloser. The second loosening contact 12 of the intermediate relay is connected in parallel with the resistor 7, and the closing contact 13 is connected to the switch on circuit.

The device works as follows.

In the presence of alternating voltage at the source 2 of the dependent power supply, the coil of the intermediate relay 6 is energized, the intermediate relay is activated and, with its closing contact 13, prepares the switch-on circuit.

When the contacts of the 4 control keys or the contacts of the 5 automatic recloser are closed, the switch is turned on. With a dependent power supply of the switching on electromagnet, the switch is turned on for short-circuit currents either completely (with a latch fit) or incompletely (without a latch fit).

In the case of a latching, the switch is turned off when the output bodies of the relay actuate. And if the contacts of the 4 control keys I.PI contacts 5 of the automatic recloser

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For reasons that remain closed, multiple switching on of the short circuit breaker does not occur. After the switch is seated, the auxiliary contact 9 of the switch opens. The winding of the intermediate relay 6 loses power, the intermediate relay drops off and, with its closing contact 13, opens the switch-on circuit, and the breaking contact 11 bypasses its winding.

When the intermediate relay is activated, the resistor 7 is shunted by its 5 opening contact 12, which reduces the response time of the intermediate relay and increases the thermal resistance of the winding. Resistor 8 prevents short circuits in the auxiliary circuits in the event of a winding of the intermediate relay.

8 case of opening of contacts 4 of the control key or contacts 5 of AR, which remained closed for some reason, the intermediate relay triggers again and with its closing contact 13 Prepares the circuit for switching the switch on.

In case of incomplete charging (without latching, the switch is disconnected automatically without activating the output bodies of the relay protection. When the switch is turned on, the insulation can be broken through the main contacts of the switch by reducing the voltage in the main circuit and, accordingly, at the terminals of the switching electromagnet with the switch the release spring returns to its original (disconnected) position and in this case the disconnecting auxiliary contact of the switch

9 does not work. By reducing the voltage in the auxiliary circuits

to a value less than the return voltage, the intermediate relay 6 disappears and the device operates as in the case of a switch on the latch. When the voltage in the auxiliary circuits decreases to a value greater than the return voltage, the intermediate relay 6 does not disappear and, by its closing contact 13, does not open the circuit breaker closing circuit. After automatic shut off. neither switch nor recovery

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voltages in the auxiliary circuits to a value that is higher than the voltage of the middle relay, the intermediate relay, and. in case the control key contacts 4 or contacts 5 of the AR device remain closed for some reason I, it is possible to repeatedly switch the switch on the short-circuit current, which leads to wear of the main contacts of the switch and ultimately welding them, since the switching resource at currents The short circuit for the battery switches is deactivated on-off cycles. In order to avoid this, the operation voltage of the minimum voltage relay 1 corresponds to the lower voltage value at which the switch turns on the short-circuit current completely (with latching). When the voltage drops in all the help circuits to a value less than the voltage of the relay of the minimum voltage, it works and by its opening contact 10 bypasses the coil of the intermediate relay 6, which by its closing contact 13 breaks the switch-on circuit and the device operates as and in the case of landing off the latch.

Resistor 3 is designed to increase the thermal resistance of the winding of a minimum voltage relay 1.

The use of the proposed device in comparison with the known one allows an increase in the operability of the device by blocking the switching of the switch on short-circuit currents during a long-term decrease in the voltage of the auxiliary switch circuits.

Compiled by K. Shilan Retur N. Margolina Tehred L. Serdyukova. M. Sharoshi's Corrector

Order 280/54 Draw 619 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

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Claims (1)

The invention of the device for blocking from repeated switching on of a switch with automatic restarting, contains an intermediate relay, the winding of which is the first terminal under the cell (turns to the first terminal of the dependent power source, the second terminal through the series-connected resistor, the second resistor and the auxiliary contact of the switch to the second terminal of the dependent power supply, the closing control contact, and the auto-reclosing opening contact, the first dy which are connected to the first terminal  the intermediate relay windings, the second terminals are connected to the first output of the closing contact of the intermediate relay and through the first disconnecting contact of the intermediate relay are connected to the connection point of the second output of the intermediate relay winding and the first resistor, the second output of the closing contact of the intermediate relay is connected to the on circuit of the switch, and parallel to the first A second contact is connected to the resistor: an contact for an inter relay relay, characterized in that, in order to increase reliability, it additionally introduces a relay mini-mains voltage, the first winding terminal of which is connected to the output of the disconnecting auxiliary contact of the switch, which is connected to the second output of the dependent source, the second winding terminal of the undervoltage relay is connected via the newly introduced third resistor to the first output winding of the 1H relay, and the opening contact of the minimum voltage relay is connected parallel to the first opening contact of the intermediate relay.