SU1686592A1 - Device for protection against damage of electromagnets for control over oil circuit breakers with groups of interlocking contacts - Google Patents

Abstract

This invention relates to electrical engineering, in particular, to relay protection of electrical installations. The purpose of the invention is to increase the reliability of operation with three-phase non-switching electromagnets. The goal is achieved by additionally introducing a relay for limiting the duration of a control command 12 with two closing contacts 11

Description

The invention relates to protection devices for electrical installations of substations and can be used in control devices for oil circuit breakers 110–220 kV.

The aim of the invention is to increase the reliability of operation with three-phase non-switching electromagnets.

The drawing shows a diagram of the proposed device.

The device comprises a control unit 1 comprising a control key 2 and a control relay 3, a switching unit for switching circuits of electromagnets, a turning on switch unit 5, a switching unit for switching circuits of electromagnets, a switching switch block 7, a switch non-switching phase control unit 8. The switching unit 4 of the switching circuits of the electromagnets is made in the form of the first disconnecting contact 9 of the lock-out relay 10, jumping contact 11, the control command duration limit 12 and the switch-on preparation relay 12, the switch-on switch 5 is made in the form of the closing contact 14 of the switch-on preparation 13, winding relay On command 15, electromagnet switching on unit 16, switching circuit switching unit 6 is made in the form of closing contact 17 on switch On relay 15, closing contact 18 with time delay n the return of the relay 12 limiting the duration of the control command, the closing contact 19 of the relay 20 for monitoring the health of the non-switching phase 8 switch and the winding of the disconnect preparation relay 21, the switch-off switch 7 is made in the form of the closing contact 22 of the disconnect preparation relay, turning the winding 23 on, the winding of the relay 10 blocking from jumping, block 24 of electromagnet disconnection, block 8 of the non-switching phase switch control is made in the form of a winding of the relay 25 control disconnecting the three phases of the switch With the break contact 26, the windings of the relay 27, the non-switching of the phases with the opening contact 28, and the windings of the relay 20 of the condition monitoring. The device also contains serially connected with the winding of the relay 12 control command duration disconnecting contacts 29 and 30 locking relays 10 Jump and relay 15 of the Enable command respectively, closing contact 31 of the position relay 23 On.

The drawing shows the first - fourth groups 32-35 of the block contacts of the phases of the switches: the first group 32 includes the opening blocks of 36-38 phases of the switches, the second group 33 - the closing contacts of 39-41 phases of the switches, the third group 34 - the breaking contacts

42-44 phase switches, the fourth group of 35 - disconnecting the block contacts 45-47 and the closing block contacts 48-50 phase switches.

The device works as follows.

In the initial state, the relay 12 of the control command duration limit is in the triggered state along the circuit: plus DC bus with operating current, disconnecting contact 29 of the locking relay 10 Jumping, disconnecting contact 30 of the Relay command 15 Turn on, winding the relay 12 for limiting the duration of control commands minus power tires

direct operating current. The start-up preparation relay 13 is in the de-energized state along the circuit: plus DC bus power, break contact 9 of the lockout relay 10

From the jump, the closing contact 11 of the relay 12 limits the duration of control commands, parallel connected disconnecting contacts 36-38 of the phase of the switch, the winding of the relay 13 preparation

power on minus bus power. The closing contact 14 of the relay 13 for the preparation of switching on the circuits of the switch-on unit of electromagnets 16 is closed, the switch-on unit 16 of electromagnets is prepared for receiving control commands. The closing contacts 19 of the health monitoring relay 20 of the switch 8 of the phase non-switching control of the switch and the contacts 18 of the relay control duration relay 12

are closed.

When a command to turn on the switch is triggered, the Relay 15 command is activated. The electromagnets are energized by the contacts 30 of the relay

The 15 On command is removed, plus the operating current supply busbars from the winding of the control command limit relay 12. If the switch is turned on successfully, the winding of the switch-on preparation relay 13 is provided by the opening of the breaker contacts 36-38 of the switch. The anchor of the relay 13 disappears and the relay opens its closing contact 14 in the circuit of the switching electromagnets block 1b. This removes the action of the command to turn on the switch and the relay 15 returns to its initial state. The anchor of the relay 12 during this time will not have time to fall off, since the time delay for falling off the core of the relay 12 when it is de-energized is longer than the time the switch is turned on. The winding of the relay 12 for limiting the duration of control commands receives power through the circuit: disconnecting contacts 29 and 30. After the switch is successfully turned on, the closing contacts of the 39-41 phases of the switch are closed, which cause the opening of the relay 21 for opening the circuit: closing contact 19 of the relay 20 control the health of the block 8 control non-phase switch, the closing contact 18 of the relay 12 limiting the duration of control commands, closing the block contacts 39-41 of the phase switch. After the switch is turned on, the On switch 23 also triggers, which by its closing contacts 31 shunts the opening contact 30. This increases the reliability of the power supply circuit of the relay coil 12. The tripping preparation relay 21 closes its closing contact 22 in the circuit of the electromagnets disconnecting circuit 24 to the acceptance of control commands.

When a shutdown command is given, the blocking relay 10 is triggered from jumping, which holds the tripping pulse until the switch is completely switched off. At the same time, blocking relay 10 From jumping, with its normally closed contact 29, removes Plus from the winding of the relay 12 limits for the duration of control commands. If the switch is turned off successfully, the winding of the preparation relay 21 is disconnected - and de-energized by the breaking contacts of the 39-41 phases of the switch. Relay 21 opens its contact 22 in the circuit of block 24 for switching off electromagnets and thereby removes the action of the command to turn off the switch. The anchor of the relay 12 does not have time to disappear, since the switch off time is an order of magnitude shorter than the turn-on time of the relay 21. After the shutdown command is completed, the device returns to its original state.

When a command is issued to turn on and refuse to turn on one or two phases of the switch, the block 8 of the phase non-switching control unit switches off the switched on phases. The control circuit returns to its original state.

When a command to turn on and refuse to turn on all three phases of the switch from the winding of the relay 12, the duration of the control commands is removed, plus the control bus of the opening contact 30. The anchor of the relay 12 disappears with a time delay and opens the contact 11

0 a winding circuit of a turn-on preparation preparation relay 13, which by its contact 14 in the circuit of the electromagnet switching unit 16 removes the operation of the switch-on command and the device circuit returns to the initial state. Relay 23 of the On position does not work because the on / off switch did not turn on.

When issuing a command to turn off the on switch and with an incomplete phase

When it is turned off, the phase switch non-switching unit 8 control unit gives an additional impulse to turn off the switch.

When giving the command to disconnect from the winding of the relay 12 limiting the duration

5 control commands are removed, plus the opening of the disconnecting contact 20 of the lock 10 relay From jumping

If the failure of the disconnected phases does not occur, the relay 12 will disappear with a time delay and, with its closing contact 18, provide power to the relay 21 winding, which by the contact 22 in the circuit of the electromagnet disconnecting unit 24 removes the control command from the electromagnets. The winding circuit of the relay 21 is provided, moreover, also by the contact 19 of the relay 20 of the control of the health of the block 8 of the control of non-switching of the phase of the switch, since this block remains in the activated

0 state. At the same time, it is still possible to disconnect the switch from the control switch 2 to the control relay 2. If this possibility is unsuccessful, the control circuit of the shutdown unit 7 is disconnected by the contact 18 of the relay 12 limiting the duration of the control commands,

In case of failure to disconnect all three phases of the switch by contact 29 of the relay 10 of the lock, the jump is removed from the jump plus

0 the relay coil 12. The anchor of the relay 12 with time delay disappears, causes the opening of the contact 19 of the relay 12 in the control circuit of the switching unit 6 switching circuits of the control electromagnets and de-energizing the relay

5 21 disabling preparations, i.e. the action of the disable command is removed. The control circuit returns to the on position of the switch.

When giving the command to turn off the off switch and refuse to turn on

One phase is triggered by a switch non-phase switching control unit 8, which disconnects the on-switch phases. If at the same time one of the included phases of the breaker fails to disconnect, then the relay 12 will de-energize its contacts 11 and 18 in the relays 12 and 21 of the preparation for switching on and off. Relays 13 and 21 in the control circuit of the on and off blocks will remove commands from both the circuit of the electromagnet switching unit 16 and the circuit of the electromagnet shutdown unit 24. Block 8 of the control of non-switching of the phases of the switch simultaneously starts the automation of the node with the faulty switch.

This device for protection of electromagnets for controlling oil switches from damage provides protection in all switch operation modes and in all cases of failures while maintaining speed and reliability of protection. Due to this, the accident rate during operation is reduced, the reliability of the protection systems is increased, and the operating costs are reduced.

Claims (1)

Apparatus of the Invention A device for protection of electromagnets for controlling oil switches with a block of contact blocks from damage, comprising a control unit including a control key connected in series and a control relay, a switching unit for switching electromagnets, a switching unit for switching electromagnets, a phase non-switching control unit, a unit turn on the switch with the command relay Switch on and the switch off switch with the position switch On and the lock relay from jumping, with the circuit pack These units are designed to be connected to the power busses of a constant operational current, the switching unit of the switching circuits of electromagnets is made in the form of the first disconnecting contact of the lock-out relay, the first output of which is intended to be connected to the positive power bus, and the winding of the start-up relay, the first and second the terminals of which are intended to be connected respectively to the first terminal of the first group of block contacts of the circuit breaker and to the negative power bus, the switching unit of the circuits The electromagnets are made in the form of the closing contact of the On command relay, the first output of which is intended for connection to the positive power bus, and the second is connected to the first output of the closing contact of the relay of the non-switching of the switch phase and is connected to the first output of the second group of the phase contact block switch and winding a disconnect preparation relay, the first and second terminals of which are intended to be connected and respectively to the second output of the second group of auxiliary contacts of the switch and minus power supply bus, the unit 0 control of the non-switching of the phase of the switch is made in the form of a relay controlling the switching of the three phases of the switch, the first terminal of which is intended to be connected to the first terminal of the third group of auxiliary contacts 5 phases of the switch, a non-switching phase relay, the first output of which is connected to the output of the disconnecting contact of the three phase switch-off control relay, the second output of which is intended to 0 connection to the first output of the fourth group of the phase-contacts of the switch, relay monitoring the health of the non-phase-switching control unit of the switch, the first output of which is connected to the output of the opening contact of the phase non-switching relay, the other output of which is intended to be connected to the third and third power bus the fourth group of the block contacts of the phases of the switch, the second The pins of these relays are combined and intended to be connected to a negative power bus, characterized in that, in order to increase the reliability of operation with three-phase non-switching of electro5 magnets, control relays with two closing contacts with time delay for return are additionally introduced in series the second disconnecting contact of the relocking interlock From the jump and the disconnecting contact of the command switch on the switch on switch, in parallel to the latter the closing On-Off Relay Position The switch-off switch is turned on, the second output of the first closing contact of the blocking relay is connected from the jump to the first output of the first closing contact with time delay for the return of the control command duration limit, the second output of which is to be connected to the second output of the first group a block of contacts of the phases of the switch, another conclusion of the second disconnecting contact of the relay 5 Interlocking From Jumping is designed to be connected to the positive power bus, another output of the open contact of the relay command. Switch on the switch-on unit is connected to the first terminal of the coil of the limiting relay duration of the command 9 .J68659210 control, the second output of which is intended to control to connect to the negative bus, pi to positive power bus, its second output tani, the first output of the second closing connection with the second output of the closing contact with time delay on return contact of the relay of control of serviceability of the block relay time limit command5 non-phase switch.