SU691979A1 - Electric power supply system - Google Patents

Description

(54) POWER SUPPLY DIAGRAM

The invention relates to the field of production and distribution of electrical energy and can be applied to power plants and substations for automatic control of the main circuitry in emergency situations.

Known power supply circuits with automatic control of connections of power stations and substations in emergency situations, consisting of; of the circuit breakers installed in the circuit of these connections (generators, transformers, lines, section switches, etc.). and. the complex of relay protection of these connections acting on the opening of the switches and the automation acting on the repeated opening of the switches (AR), and in a number of cases the opening of the switches of the adjacent connections of a part of the circuit or the whole circuit of the main circuits using the backup device when the switch fails (URON ) one.

A power supply circuit is also known, comprising switches at each connection, voltage transformers, an operational power supply unit, a relay protection and automation unit for connections 2.

A disadvantage of the known systems is that their work in emergency situations, for example, in case of a switch failure in the operation of “shutting down (or incorrect actions of the latching), and also in case of damage of the switch, it leads to de-energization (“ depletion ”) of the circuit a) main circuits, including intact connections, i.e., to a violation of the power supply of consumers, a decrease in electrical power output, an accident, in the electrical system, or other situations.

The aim of the invention is to increase

5 reliability of power facilities.

For this, the power supply circuit is supplemented with automatically controlled switching devices, for example, separators connected in series with 0 connection switches, and an automation unit controlling these devices and switches consisting of a voltage relay connected to the transformer

voltage, output relays by, the number of connections connected to the relay protection unit through a switch block contact and to the operating power unit through its own closing contact, a time relay connected through a series-connected disconnecting relay of a voltage relay and closing contacts of the output relays to the unit operative power supply, a relay controlling the position of the said devices, connected to the operative power supply unit through the switching contacts of the switching devices and a switch-on relay, connected to the power supply unit perativnogo ggItany through contact time switches and parallel-connected relay contacts controlling the position of switching devices.

The drawing shows the proposed system as applied to the main circuit diagram with one partitioned bus system and one switch at each connection. .

The circuit contains a unit 1 for automatic control of separators and emergency shutdown of switches, separators 2 connected in series with switches 3 for all connections of this circuit,

Automation unit 1 is connected to relay protection and circuit automation unit 4. Relay protection and automation unit 4 consists of relay protection 5 and automation 6 of each connection, a backup device in case of a switch failure (breaker failure voltage) 7, differential busbar protection 8 of a voltage transformer 9, and an operational power supply device 10, which provides power to all system elements; a main circuit diagram consisting of section 11 and section 12 of prefabricated women and connections, for example, lines 13, transformers 14, generators 15 ji of a section switch 16.

The automation unit of the proposed system consists of a voltage relay 17 connected to a voltage transformer 9 connected to section 11 of busbars; output (according to the number of connections) relay 18 of the memory connected to the relay protection- 5 through the block contacts of switches 3, time relay 19 connected to voltage relay 17 by output relays 18 and separator 2; relay 20, controlling the position of the separator connected to the auxiliary contacts 21 of the separator 2 (at each connections); a switch-on relay 22 connected to a time relay 19, a separator position control relay 20 and an output relay 18.

This system works as follows.

In case of damage at any connection, for example, on line 13, the following are triggered: relay protection 5, output relay of memory 18 and automatic 6 of this connection. If the switch 3 of this connection fails in the cycle “disconnecting or when it is damaged, LEVEL 7 operates, which acts to open the switches 3 of all connections of section 11. At the same time, the voltage on this section (including the voltage transformer 9) disappears, which leads to the loss of the relay 17 voltage and the closure of its contacts in the circuit of the relay 10 time, the operation of which occurs through the contacts of the relay 18.

Relay 19 time with time delay, greater cyMNiapHoro operating time of the complex of relay protection and automation of connections in this section, closes its contact in the trip circuit of the separator 2 damaged connector 13 (through the closed contacts of the activated relay 18).

When the separator 2 is disconnected, its block contacts 21 close the coil circuit of the relay 20. Relay 20 with its contacts ensures the operation of the relay 22.

Relay 22, triggered, acts on the inclusion of switches 3 all connections section 11.

When it appears on the voltage, the relay 17 is triggered and the time relay 19 decelerates to open the contacts in the relay circuit 22.

Thus, the scheme of power station section 11 is restored automatically (except for the damaged connection).

Claims (2)

1. Fedoseev AM, Basics of Relay Protection, SEI, 1961, p. 101. 2. Vasiliev, A. A. Electric. Part of stations and substations 1963, p. 346. pp m 1 i 5 -, J, sch-  2c ||| «« 1 : |} enI ng1kpuosekh fUKCLjpo Yrv 4. ZO21 L12 / J P