SU680095A1 - Automatic means for substations having power lead-in switchhes and a selection switch - Google Patents

Description

other groups, etc. it is otherwise possible that if one switch is disconnected for a short time (for example, the supply power line 500 -: - 220 kV), the substation under consideration will be completely de-energized.

The purpose of the present invention is to improve the reliability of automation by providing a selective start of AR or AVR.

The goal is achieved by the fact that a control unit for a substation having insulators in the supply water and a sectional switch and containing a frequency reduction unit connected to the time delay direction through one of the sections of the substation has a control unit for example. the frequency of the other section and an additional time delay unit, one of the inputs of the voltage and frequency control unit connected to the output of the frequency lowering unit, the outputs of the control unit voltage and the frequencies are connected to the inputs of the time delay blocks, one of the outputs of the auxiliary block. The time delay is connected to the output of the main block of the time delay, and the other two outputs of the additional block of the belt delay are intended to be connected to the circuit breaker of the power input switch Turn on the breaker.

The drawing shows a block diagram of a complex device for selectively starting automation, which is a loss of power and prevents a non-synchronous switching on of consumers.

The complex device consists of a block for decreasing the frequency 1, which is supplied from the voltage transformer 2, the active power direction unit 3, which is read from the voltage transformer 2 and the current transformers 4, the voltage control unit and the frequency of another section 5 that is powered by transformers 6, a block of time delays 7 and 8, which are outputs of the device.

Block 1 through block 3 is connected to block 7 of the time delay.

The unit 5 controlling the voltage and frequency of the other section, when the device is implemented using electromechanical relays, collects from the relay (voltages with a pickup setting (0.8, OO, 9) Vu and a frequency relay with a setpoint of operation. 49 Hz The activated state of unit 5 corresponds to the position when the relay contacts of the voltage of this block are closed, i.e. when the voltage is higher (0.8-i-0.9) Un and when the contacts of the frequency relay included in the block 5 ., open, that is, when the frequency is above 49 TC.

The condition for the operation of block 7 is the mandatory operation of blocks 1 and 3 and the failure of the block 5.

The condition for the operation of block 8 is the mandatory triggering of blocks 1 and 5.

When the power supply of one of the sections is lost due to running out synchronous and asynchronous electric motors, the frequency of this section decreases, and the frequency decreasing unit 1 and the unit controlling the direction of the aktiV.powered power 3 operate.

If the power loss occurred simultaneously in both sections, block 5 does not work, and time delay block 7 is triggered, which gives an impulse to turn off input switch 9 with one time & a ban on the operation of the ATS device to turn on switch 10, turn off or be excited synchronous motors connected to this section of tires, and

to start the device AIV switch 9. If the power to the other section is preserved, then, simultaneously with the operation of blocks 1 and 3. block 5 operates, which controls the voltage and frequency of the other section, a sipnal is sent to prohibit the operation of the time delay block 7 and the unit works. time delay 8, which turns off switch 9, turns off or .excites synchronous motors connected to

this section, and starts the device ABP to turn on the switch 10.

The setpoint for the frequency of the block. For the lowering of the frequency is 1., for example, 1 as a rule, 48.5 Hz. Thus, the device provides

selective action of automation, in the case of power supply on a backup source Preference is given to the AVR device, and in cases when the backup source is disconnected or when both input power transformers are powered simultaneously, the power is restored by the AR device.

The selection of the action of abtomatics is performed automatically, without any switching in the scheme and without tabs.

Scoring formula

A1 automatics device for a substation having switches in the power inputs and a section switch that contains a frequency block in one of the sections of the station, connected through a block to change the direction of the active power with a time delay unit, characterized in that Automation by way of guiding the electoral reclosing of the automatic reclosing or automatic reclosing, the voltage and frequency control block of the other section and the additional time delay block, one of the inputs of the voltage control block and the hour The frequencies are connected to the inputs of the variable delay unit, one of the outputs of the additional time delay unit is connected to the output of the base time delay unit, and the other two outputs of the additional unit are tempo Delays are intended to be connected to the disconnecting power switch circuit.

input and to the center & p M turn on the sectional switch.

Sources of Information taken into account

1. USSR Author's Certificate No. 278825, cl. H 02 J 9/06, 1968.

2. Authorship of the USSR Wo 319991, cl. H 02 J 11/00, 1967.