SU1480000A1 - Controller of switches of converged phases for self-compensating power transmission line - Google Patents

Abstract

The invention relates to electrical engineering and is intended to control the switches of self-compensating power lines (SVL). The goal is to increase the reliability of power supply by eliminating non-selective disconnections of the phases of an intact circuit during phase-to-phase closures of the remote phases of an SVL. The functional diagram of the device is given for the general case of performing the SVL, when the approximate phases of one circuit are A1, B1, VP, SP, and the different circuits are C1, AP. With the closure of contiguous phases C1 of the AP of different circuits, the protection of both circuits 30, 31, the electoral authorities of the 23 phases of the SA, unit 6, disconnects the pairs of contiguous phases of C1 and AP. The signal from the output of the element 11 without time delay passes to disable the damaged phase C1. The signal from the output of the element And 9 blocks the signal at the inverse output of the trigger. The circuit is switched to the state of readiness to switch off upon the subsequent closure of phases C1 and A11 + phase A11. With the closure of uncombined phases of one circuit B1 C1, the protection of the first circuit 30 and the selective body 26 work. The signal from the output of the element And 18 enters to turn off the first circuit. The device works in a similar way when closing the non-adjacent phases of the second circuit. 1 il.

Description

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CI All of the different circuits are protected by both circuits 30, 31, the election authorities of the 23 phases of the SA, block 6 turns off pairs of contiguous phases CI and AI. The signal from the output of the element 11 without time delay passes to the disconnection of the damaged phase CI. The signal from the output of the element And 9 blocks the signal at the inverse output of the trigger. The circuit is switched to the state of readiness to turn off when the phases CI and AI are closed, the phase AI. With the closure of uncombined phases of one BI CI circuit, the protection of the first circuit 30 and the selective body 26 work. The signal from the output of the element And 18 enters to disconnect the first circuit. The device works in a similar way when closing the non-adjacent phases of the second circuit. 1 il.

one

The invention relates to electrical engineering and is intended to control the switches of self-compensating power lines (SVL).

The purpose of the invention is to improve the reliability of power supply by eliminating non-selective disconnections of the phases of an intact circuit during phase-to-phase closures of remote phases of an SVL.

The drawing shows a functional diagram of the proposed device.

The scheme is given for the general case of performing the LLL, when there are both the approximate phases of one circuit (A1 BI, BII SI) and different circuits (CI AI

The device contains a block 1 for determining a pair of damaged contiguous phases of different circuits, consisting of one logical element AND 2, a block 3 for determining the bunks of damaged contiguous phases of one circuit, consisting of two logical elements AND A and 5, three blocks 6-8 for disconnecting a pair of contiguous pairs phases, each of which consists of four logical elements AND 9-12, two elements of Delay 13 and 14 and one trigger 15 two blocks 16 and 17 for determining the damaged phases of the first and second circuits, each of which consists of two logical elements AND 18 and 19 first of all th circuit and two logical elements And 20 and 21 of the second circuit of the line, the body 22 voltage zero-sequence (3U0), electoral authorities 23-29, the corresponding phases CI AI, AI BI, BII SI, BI CI, CI AI, AI BII , SI AN, outputs of relay protection of parallel circuits 30 and-31.

The device works as follows.

Any closure of the adjacent phases of the SVL is detected by one of the elements AND block 1 or block 3 for determining a pair of adjacent phases. With the closure of contiguous different circuits of the CIAII phases, the protection of both circuits 30 and 31, the electoral bodies of the 23 phases of the SA, the absence of a zero sequence voltage of the organ 22, the element II

it triggers and the signal from its output goes to the first inputs of elements AND 9, 10, 11, and 12 of block 6 to turn off a pair of contiguous phases CI and AI. At the same time on the second inputs of the elements

Both 9 and 11 signal the signal from the inverse output of the trigger 15. The signal from the output of the element 11 without time delay is about to turn off the faulty phase C7 .. The signal from the output of the element

 And 9 enters the input element 13 Delay on operation, which, with a time delay greater than the pause of the automatic reclosing (automatic reclosing), switches the trigger 15, blocks the signal at the inverse output of the trigger and appears on the forward side. The circuit is switched to the state of readiness to switch off upon the subsequent closure of phases CI and AH damaged

Phase AN.

When the non-adjacent phases of one circuit are closed, for example, BICI, the protection of the first circuit 30 and the selective body 26 (BICI) works, the zero sequence of the body 22 is absent and the protection of the second circuit 31 does not work. The signal from the output of the And 18 element goes to the first circuit disconnecting.

With the closure of uncombined phases of the second circuit, for example, AH BII,

31

bathes an element And 20 and disconnects the second chain.

Thus, the proposed device makes it possible to increase the reliability of the power supply to the consumer, increasing the turnaround time between the switches.

Claims (1)

Invention Formula The self-compensated transmission line (SVL) switch-disconnector control unit consists of two parallel circuits, containing electoral authorities, zero sequence voltage and protection outputs of the first and second circuits, in order to improve the reliability of power supply by eliminating non-selective disconnection of the phases of the intact circuit during phase-to-phase closures of the remote phases of the CRS; it is additionally equipped with a unit for determining a pair of damaged contiguous phases of different circuits, in And from the logical elements in an amount equal to the number of adjacent phases of different circuits, each of which has one output, three working inputs and one prohibition input, with a block for determining a pair of damaged contiguous phases of one circuit made of logical elements AND, in an amount equal to adjacent phases of one circuit, each of which has one output, two working inputs and one inhibit input, three blocks of phase-by-phase disconnection of a pair of adjacent phases, each of which is made of four AND elements having one output and two inputs, two DELAY ELEMENTS with one input and one output and a trigger having two inputs and two outputs - direct and inverse, blocks determining damage to a pair of uncombined phases of the first and second circuits, each of which is made up of logical elements AND, in the number of pairs of uncombined phases corresponding circuit having one output, two working inputs and two prohibition inputs, with ten 15 20 25 800004 this is the input of the prohibition of each element And the block for determining a pair of damaged contiguous phases of different circuits connected to the output of a zero-sequence voltage organ, to the first working input is the output of an electoral body corresponding to a pair of contiguous phases, to the second and third working inputs relay outputs of the first and second SVL circuits, the output of the prohibition of each element AND the block for determining a pair of damaged contiguous phases of one circuit is connected to the output of the zero-sequence voltage organ, to the first working input you The selective body of the corresponding pair of adjacent phases, and the second working input of the relay protection output of this circuit, the output of each element AND blocks for determining the pair of damaged adjacent phases are connected to the first inputs of the four elements AND the corresponding block of the pair of adjacent phases, the outputs of the first and second elements AND connected via the corresponding elements of the DELAY to the trigger inputs, the direct trigger output is connected to the second inputs of the second and third elements AND, and the inverse to the second inputs of the first and fourth A single element AND a phase-disconnecting unit of a pair of contiguous phases, outputs of the third and fourth elements of AND are connected to the disconnecting circuits of the corresponding pair of phases, the output of the zero-sequence voltage element is connected to the first input of each element AND blocks to detect damage to the pair of unstable phases of the first and second circuits to the first working input - the output of the electoral body of the corresponding pair of phases, to the second working input - the output of the relay protection of this circuit, to the second input of the prohibition - the output of the relay protection second minutes iepi DES, and the output of each AND gate blocks determining injury pair nesblizhennyh phases of the first and second chains displayed on disconnection of the first and second circuits of DES. thirty 35 40 45 50