SU1399851A1 - Apparatus for interlocking from repeated energization of electric installation in failure - Google Patents

Abstract

The invention relates to the field of electrical engineering and is intended for. f} blocking the electrical installation in case of damage. The purpose of the invention is to increase the reliability of the device by ensuring the health of the circuits inside it. When the isolation level drops below the permissible value, the protection unit 1 opens its contact 2, thereby de-energizing the relay 9, and the power is removed from the contactor coil by contact 12. The consumer is disconnected from the mains. The disconnected state of the relay 9 and the triggered state of the relay 3 gives information to the personnel about the operation of the protection unit. If the power supply is interrupted by any of the interlocking relays 3 or 9, the contactor is disconnected, thereby self-checking the integrity of the circuits inside it. 1 il. in i cl

Description

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The invention relates to devices for blocking against repeated inclusions of an electrical installation for damage and can be used in various electrical installations.

The goal of the invention is to improve the reliability of the device by ensuring the control-malfunction of the circuits included in it.

The drawing shows a diagram of the device.

The device for blocking from repeated switching on of the electrical installation for damage contains a protection unit 1 connected to the network wires with an output closing contact 2, a first blocking relay 3 with the first A and the second 5 closing contacts, opening 11 (contacts 6 with them, coil of the contactor 7 with contacts 8 in the network, the second blocking relay 9 with closing contacts 10-12 and three-way switch 13.

The protection unit 1 may, for example, be designed as a leakage current relay.

The device works as follows

When the switch 13 is turned on, the supply voltage is supplied to the protection unit 1 (leakage relay) and the control and interlocking circuit. The protection block is turned on by closing contact 2 in the coil circuit of the interlock relay 9, which closes contact 11, thereby self-locking, closing contact 10, causing the first interlocking relay 3 to trip, which by contact 4 also self-locking. Contacts 5 and 12 are also closed, thereby applying voltage to the coil of contactor 7, which by means of contacts 8 on the network supplies voltage to the consumer.

In the event of a malfunction in the network; (reduction of the insulation level), the protection unit 1 opens contact 2, which de-energizes the relay 9. Interlock mode

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Le 9 contact 12 de-energizes the coil of the contactor, which disables the consumer, carried out self-locking. The disconnected state of the relay 9 and the triggered state of the relay 3 gives information to the personnel about the operation of the block. After that, it is necessary to turn off the switch 13 and repair the damage to the R network.

If the power supply is interrupted by any of the interlocking relays 3 or 9, the contactor is disconnected, thereby self-checking the integrity of the circuits inside it.

Claims (1)

Invention Formula A device for blocking from repeated switching on of an electrical installation for damage, comprising a contactor coil, a first blocking relay with a first closing contact in its coil circuit, a series opening contact of the first blocking relay and a closing contact of the protection unit, characterized in that, in order to increase reliability operation of the device by ensuring control of the operability of the circuits entering it, a second locking relay with three closing contacts is inserted into it, while the first The closing contact of the first interlock relay is connected to the first closing contact of the second blocking relay, a series-connected closing contact of the protection unit and the disconnecting contact of the first blocking relay are connected to the coil circuit of the second blocking relay, the second closing contact of which is connected in parallel to the open contact of the first blocking relay the contactor coil circuits are connected in series with the closing contacts of the first and second locking relays.