RU4418U1 - DEVICE FOR AUTOMATIC START-UP OF CONSUMER POWER SUPPLIES - Google Patents

Abstract

A device for automatically turning on the backup power supply of consumers, containing a start-up circuit formed by series-connected disconnecting contacts of two undervoltage relays, the windings of which are connected to various interphase voltages from the voltage measuring transformer on the consumer buses, the closing contact of the maximum voltage relay, whose winding is connected to the interfacial voltage of the measuring bus voltage transformer of the backup power supply, and relay coil belts, chains formed in series by the closing block contact of the main power supply transformer switch located on the bus side of the main source and the relay coil of the on position of this switch, sequentially connected by the closing block contact of the main power transformer switch located on the consumer side of the bus, and the relay coil of the on position of this switch, in parallel interconnected by disconnecting block contacts, turn off fuses of the transformer of the backup power source and the winding relay of the disconnected position of these switches connected in series to them, a single-shot circuit formed by parallel-connected closing contacts of the memory relay and the switched-on relay of the main power supply transformer switch located on the side of the consumer buses, and connected in series to between them and with each other by the closing contact of the relay of the disconnected position of the switches of the transformer of the backup source

Description

UTILITY FOR AUTOMATIC VIEWING RESERVE GZTASHTA CONSUMERS

The utility model relates to devices for automatically switching on the backup power supply / ABP / and can be used for substations of power systems and industrial enterprises with two-transformers.

Known devices for automatically turning on the backup power supply, providing the 1st time of switching on the backup source when the voltage on the consumer buses decreases or disappears for any reason, using a special switch-on relay having a delay time for return. They are. contain ATS start-up circuits made using a voltage relay and a time relay, automatic control circuit breakers of the main and backup power supply, on and off relays of switches 1,2,

The disadvantage of these devices is the difficulty of setting up a one-shot relay for a given return time, which should with some margin exceed the time for reliable switching of the backup source switches, excluding its repeated switching on to a stable short circuit on consumer buses after disconnecting from relay protection.

Closest to the claimed device is a device diagram for automatically turning on the backup power supply of consumers according to copyright certificate No. 775821, providing a one-time action using an intermediate relay without delay return / memory relay / W,

However, this device does not provide for the monitoring of the working condition of the switching circuit of the backup power supply circuit breakers from the ATS. Therefore, in case of malfunctions that caused the intermediate relays to return to an unworked state in the single-acting circuit, the device fails to operate, resulting in a decrease or disappearance of voltage on the consumer shaker and disconnect-yc-f Y /

1ZHI H02 5 9/06, the main power source will not automatically turn on the backup power source. This will cause a loss of power to electricity consumers. The objective of the utility model is to increase the reliability of the operation and ease of use of the device for automatically turning on the backup power of consumers. The essence of the claimed utility model is as follows. Figure 1 shows a schematic diagram of a substation on which a device is installed to automatically turn on backup power to consumers. The diagram shows the transformer I of the main power supply 2 and the transformer 3 of the backup power supply 4, switches 5 and 6 of the main power supply and switches 7 and 8 of the backup power supply, voltage measuring transformers 9 and 10 for monitoring the voltage of the main and backup power, undervoltage relay II and 12, the maximum voltage relay 13. Figure 2 shows a diagram of a device for automatically turning on the backup power supply of consumers / for simplicity, the indicator relay circuits are not shown /. The start-up circuit 14 of the device consists of terminal 15 of the undervoltage relay II, terminal 16 of the undervoltage relay 12, terminal 17 of the overvoltage relay 13 and the time relay 18 connected in series. The device also contains a relay 19 of the on position of the switch 5 and a closing block contact 20 of this switch, a relay 21 of the on position of the switch b and a closing block contact 22 of this switch, a relay 23 of the disconnected position of the switches 7 and 8, connected in series with the parallel disconnecting block contacts 24 and 25 e “that: switches. The single-turn circuit 26 includes an intermediate relay without a time delay / memory relay / 27, in series with which the make contact 28 of the relay 23 is connected, and the parallel contact connected by melode closes the contact 29 of the memory relay 27 and the contact 30 of the relay 21. Control circuits 31 of the switches 6, 7 and 8 contains a parallel-connected make contact 32 of the time relay 18 and an open contact 33 of the relay of the on position 19 of the switch 5 in the trip circuit of the switch 6; switch b and closures, contact 36 of the memory relay 27 in the circuit of the circuit breaker 7 and serially connected opening contact 35 of the relay of the on position 21 of the circuit breaker b and the closing contact 37 of the memory relay in the circuit of the circuit breaker 8,

The malfunction signaling circuit 38 includes a contact closure contact 39 of the on-position relay 21 of the switch b and a normally-open contact 40 of the memory relay 27 connected in series with each other. It is connected in series with the parallel-connected opening block contacts 24 and 25 of the switches 7 and 8. The device operates as follows .

In normal operation of the transformers at the substation, the switches 5 and b of the transformer I of the main power supply 2 are turned on, and it is in operation, and the switches 7 and 8 of the transformer 3 of the backup power supply 4 are turned off and it is in standby. The block contacts 20 of the switch 5, 22 of the switch b, 24 of the switch 7 and 25 of the switch 8 are closed, as a result of which the relays 19, 21, 23 and 27 are in the activated state. The relay 21 of the on position of the switch keeps its contacts 34 and 35 in the switching circuit of the switches 7 and 8 open, and the contacts 36 and 37 of the memory relay 27 are closed. In the closed state there are contacts 28 of the relay 23 of the disconnected position of the switches 7 and 8, 30 and 39 of the relay 21 of the on position of the switch b, 29 of the memory relay 27. The open contact 40 of the relay of the memory 27 in this state of the circuit is open, as a result of which the entire state is open ATS failure alarm circuit.

If there are malfunctions in the power supply circuits of the memory relay coil 27 or relay 23 of the disconnected position of the switches 7 and 8, leading to the return of the inoperative state of the memory relay 27, its contacts 36 and 37 in the switching circuit of the switches 7 and 8 are opened, as a result of which the device turns into inoperative condition.

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But this closes the contact 40 of the memory relay 27 in the alarm circuit and through the closed block contacts 24 and 25 of the switches 7 and 8, the closed contact 39 of the relay 21 of the on position of the switch 6 and the closed contact 40 of the memory relay gives a signal to operational personnel about the malfunction of the ABP device . A modern alarm system about the malfunctioning state of the device will allow taking appropriate measures to prevent the transition of its hardware failures to functioning failures.

After turning on the switches 7 and 8 of the transformer 3 of the backup power supply 4 as a result of the automatic transfer switch, the memory relay 27 returns to the idle state, and its contacts 40 in the alarm circuit are closed. However, a signal about the malfunctioning state of the ATS device will not appear in this case, because when the switch 6 of transformer I of the main power supply 2 is turned off, its contact block 22 opens, loses power and returns to the inoperative state of relay 21 of the on position of switch 6 and contacts 39 of this relay open in the alarm circuit, and block contacts 24 and 25 of switches 7 and 8 open backup power source.

A malfunction signal will not appear during parallel operation of transformers / gates I and 3 of the main 2 and backup 4 power sources, as well as when transferring power from the main to the backup source, when their block contacts 24 and 25 open as a result of turning on the switches 7 and 8, lose power and return to the idle state of the relay 23 of the disconnected position of the switches 7 and 8, and then the relay relay 27, in which the contact 40 in the alarm circuit closes. But in general, the signaling circuit in this case turns out to be open by block contacts 24 and 25 of switches 7 and 8.

If, as a result of a stable short circuit on the consumer buses, the transformer 3 of the backup power supply 4 is turned off by the high-speed relay protection after turning it on from the ABP device, then the block contacts 24 and 25 of its switches 7 and 8 will close, contact 40 of the memory relay 27 will also be closed, t .to. it will return

in an unworked state, however, the alarm circuit will be open contact 39 of the relay 21 of the on position of the switch b, and the fault signal will not appear.

Thus, the reliability of the operation of the device for automatically turning on the backup power supply of consumers is improved due to the timely detection of a faulty state of the switching circuit of the circuit breakers of the backup power supply, the conditions for its operation by the maintenance personnel are facilitated, and the maintenance costs are reduced. Timely detection and elimination of malfunctions leading to a failure in the operation of the device will increase the reliability of power supply to consumers, reduce damage from interruption of their power supply. The manufacture of the device does not require additional hardware costs, because the relay contacts used in his circuit have the necessary contacts.

5.

Claims (1)

A device for automatically turning on the backup power supply of consumers, containing a start-up circuit formed by series-connected disconnecting contacts of two undervoltage relays, the windings of which are connected to various interphase voltages from the voltage measuring transformer on the consumer buses, the closing contact of the maximum voltage relay, whose winding is connected to the interfacial voltage of the measuring bus voltage transformer of the backup power supply, and relay coil belts, chains formed in series by the closing block contact of the main power supply transformer switch located on the bus side of the main source, and the relay coil of the on position of this switch, sequentially connected by the closing block contact of the main power transformer switch located on the consumer side of the bus, and the relay coil of the on position of this switch, in parallel interconnected by disconnecting block contacts, turn off fuses of the transformer of the backup power source and the winding relay of the disconnected position of these switches connected in series to them, a single-shot circuit formed by parallel-connected closing contacts of the memory relay and the switched-on relay of the main power supply transformer switch located on the side of the consumer buses, and connected in series to between them and with each other by the closing contact of the relay of the disconnected position of the switches of the transformer of the backup source a power supply circuit and a memory relay coil, a trip circuit of a main power supply transformer circuit breaker located on the side of the consumer bus, comprising a time relay contact and a normally-open relay contact of the main power transformer circuit breaker located on the side of the main power bus, and switching circuit of the circuit breaker transformer backup power source, each of which is formed by a series connection disconnecting the contact of the relay of the on position of the switch of the transformer of the main power source located on the side of the consumer buses, and the closing contact of the memory relay, characterized in that an additional signal circuit is introduced about its malfunction, formed in series  connected by the closing contact of the relay of the on position of the switch of the transformer of the main power source located on the side of the consumer buses, and the opening contact of the memory relay, connected in series with the parallel disconnected block contacts of the transformer switches of the backup power source.