SU1190442A1 - Device for checking synchronism in case of automatic reclosing of power line - Google Patents

Abstract

BODY CONTROL matching for the automatic retransmission VKLOCHENII LINE EZHKTROPEREDACHI, osna1tsennoy transformer voltage and a block auto-reclosing (APV and connected to, tires substation equipped with transformer voltage, the containing element is adjustable pickup delay time, two AND gates, an OR gate and two relay phase shift, the first inputs of which are intended to be connected to the output of a busbar voltage transformer, the second to the output of a line voltage transformer, the output of the first p The emta of the phase shift is NOT connected to the first input of the first element I, to the second input of which the output of the second phase shift relay is connected, the first input of the second element I is intended to be connected to the output of the automatic reclosing unit, in order to increase the reliability , additionally, the first and the second elements are activated for activation, the first one (the left one is connected between the output of the first phase shift relay and the first input of the III element, and the second one between the output of the first And element and the second input of the OR element, output element ШШ is connected to the second input of the second element I, the output of which is connected to the element is an adjustable response time delay, the output of which is intended to be connected to the enabling input of the AR unit.

Description

The invention relates to electrical engineering, in particular, to relay protection and automation of power systems.

A two-way power line closure with its three-phase automatic re-powering (AR) is usually performed with checking the synchronism between the voltage on the line connected on one side and the voltage on the buses to which it is connected. This check is performed using the synchronism control unit (OC), the main requirement of which is to ensure that the line with the O is connected between the voltage of the terminal and the line that does not exceed the maximum permissible value. At the same time, a very short time of ACS and a wide range of its working angles is very important.

The purpose of the invention is the reliability of operation.

The drawing shows a functional diagram of the ACS. .

Oprart for synchronization control during the automatic reclosing of power line 2 contains the first 3 and second 4 phase shift relays (RSF), the first 5 and second 6 elements AND, element 7 NOT, the first 8 and second 9 elements Delay on operation, element 10 OR and element P is adjustable delay time-to trigger.

Elements 8 and 9 Delay on operation: represents simple unregulated blocks. Their time delay is determined from the condition of reliable overlapping of the return time of the element 11, the adjustable response time is only a few milliseconds. At the same time, their error is not significant, since it practically has no effect on the total time of action of the ACS, unlike element 11 error. Adjustable delay time for actuation, which therefore should be very small.

Compared to the phase of the voltage, the lines 2 and w 12 through the measuring transformers 13 and 14 are supplied to both inputs of the RSF 3 and 4 RSF relays. The output of the relay 3 of the RSF through the element 7 is NOT connected to the first input of the element 5 And, to the second input of which the output of the relay 4 of the RSF is connected. Output relay 3 RSF through element 8

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The operation delay is connected to the first input of element 10 OR, to the second input of which through element 9 The operation delay is connected to the output of element 5 I. The output of element 10 OR is connected to the second input of element 6 AND, the first input of which is intended to be connected to the starting output of block 15 AR and the output is connected with the entry of element 11 Adjustable time delay for actuation. The output of the latter is intended to be connected to the enable input of the automatic reclosing unit 15.

Relay 3 phase shift together with element 8 Delay for actuation by element 10 OR, second element 6 AND and element 11 Adjustable time delay for actuation create the first zone of actuation of the organ OKS

l-Sep..JCompatible operation of both PCFs (operation of the relay 4 of the RSF and failure of the relay 3 of the RSF) in combination with the operation of the elements 7 NOT, 5 AND, 9 The response delay, 10 OR, 6 AND 11 It also creates an adjustable response time delay two (second and third) zones of operation of the ACS organ

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Element 11 An adjustable trigger time creates the time delay necessary for checking the slip in all areas of operation of the organ. This time (from 0.05 to 0.55 s) also determines the duration of the ACS as a whole. The time lag of the unregulated elements 8, 9 The delay for triggering is selected according to the condition of overlapping the return time of element 11 when the angle S changes from one zone to another is several milliseconds.

, The starting signal, which is formed in the block 15 of the automatic reclosing, with the emergency shutdown of the switch 16 and the presence of symmetrical voltages on the tires I2 and line 2, is fed to the first input of the element 6 I. In the case when the relay trips

3 RSF (i.e., angle 8 corresponds to the first zone), then through elements 8, the delay for triggering is 10 OR and 6, and element II is started. The time delay is adjustable by. operation, after which the output signal of the ocean appears. If, however, only relay 4 of the RSF is triggered, and relay 3 of the RSF does not operate (the angle o corresponds to the second or third zones), then the circuit for the start of element 11 is formed by the elements 5, 9, 9 Delay on operation, 10 OR and 6 I.

When sliding S con8t, other than zero, the operation of the ACS depends on the magnitude of the angle S at the time of launch, the amount of slip and the setting of the element I1 Adjustable time delay for activation.

Element 1I is triggered at the moment of the start of the ACS via one of two circuits: elements 8 Delay on operation, 10 W, 6 And 6 or elements 5 And, 9 Delay on operation 10 OR, 6 And and depending on the angle value 8 at the time of the start of measurement . If 8 and 5 are such that during the set time of element 11 the angle o does not have time to get out of the initial zone corresponding to the beginning of the measurement, then the ACS is triggered immediately after the element 11 triggers.

If before the expiration of the time of element 11, the angle o exits the initial zone, then element 1I returns, because its starting circuit, corresponding to the initial zone, is broken, and a new start circuit is formed only after the response time of the corresponding elements 8 or 9. Exceeds | time element return 11 Adjustable time delay for operation. The operation of the ACS in this case will occur only after the element I1, re-launched on another chain, fully accumulates its time delay.

In the proposed device, the ACS time lag, necessary for checking the slip, is created in all zones with the help of only one complex and exact element. II Adjustable delay time for actuation, and not two such elements as in the known device.

Claims (1)

SYNCHRONISM CONTROL UNIT FOR AUTOMATIC REPEATING OF THE ELECTRIC TRANSMISSION LINE, equipped with a voltage transformer and an automatic reclosing unit (AR) and connected to the substation buses equipped with a voltage transformer, containing an element with an adjustable delay time for the operation, two relay elements, And, the first inputs of which are designed to connect to the output of the bus voltage transformer, the second to the output of the line voltage transformer, the output of the first relay ha of phases through the element is NOT connected to the first input of the first element And, to the second input of which the output of the second phase shift relay is connected, the first input of the second element And is designed to connect to the output of the reclosure unit, characterized in that, in order to increase the reliability of operation , in addition, the first and second elements are delayed to operate, the first of which is connected between the output of the first phase shift relay and the first input of the OR element, and the second between the output of the first AND element and the second input of the OR element, the output of the OR element is connected is connected with the second input of the second AND element, the output of which is connected to an element of adjustable delay time for operation, the output of which is designed to connect to the enable input of the reclosure unit. >