SU1312673A1 - Device for two-phase automatic reclosing of electric power line - Google Patents

Abstract

The invention relates to automation of power systems and can be used to automatically control three-phase AC transmission lines with a voltage of 100-500 kV in emergency mode. The goal is to expand the functionality of a single-phase automatic reclosing (AR) device, which consists in performing a two-phase AR over a transmission line in a two-phase short-circuit. to land on it while maintaining stability. In the event of a biphasic h.k. on the ground, cipher & electors 2 damaged phases, block 14 latching off dyuh phases. Based on this fixation, in block 12, the two phases are switched on again, a command is generated to turn on the two off phases, provided that there are no commands to turn off the three phases from the block 9 of the three-phase disconnecting switch. The magnitude of the active power flow along the line before the occurrence of a short circuit. monitored by a previous power control unit 10 with memory. With a power flow that does not exceed the limit determined by maintaining stability during a brief disconnection of two phases, after fixing the voters' response by block 6 and detecting a two-phase short-circuit. the line goes into single-phase mode, which is fixed by block 14 for switching off two phases, and then, after its signal, block 12 for switching on two phases, generates a command to turn on two shut off phases of switch 4. I Il. G1 (L co

Description

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The invention relates to the automation of power systems and can be used to automatically control three-phase AC power lines with a voltage of 110-500 kV in emergency conditions, providing one switch off phase when a single-phase short circuit (short circuit) occurs on the ground, followed by switching on and off two phases of the switch with a two-phase short circuit. on the ground with the subsequent and inclusion.

The aim of the invention is to extend the functional capabilities of the OAPV device, consisting in the implementation of a two-phase automatic reclosing (DAPA) transmission line with a two-phase short-circuit. to land on it while maintaining stability.

The drawing shows a block diagram of the device DAPV.

The DAPV device contains a fast-acting protection 1, electors 2 damaged phases, a block of 3-phase switch off, a switch 4, a block 5 of restarting one phase, a block 6 of fixing voters response, a block 7 detecting two phase short-circuits. to ground, block 8 for detecting the need for a three-phase shutdown, block 9 for a three-phase open switch, block 10 for controlling the preceding power, block 11 for controlling the power in a non-full-phase mode, block 12 for re-activating two phases, block 13 for locking the single phase and fixing block 14 turn off the two phases.

The device works as follows.

When single phase short circuit On the ground, a high-speed defense 1 and one of the voters 2 are activated, defining the damaged phase. Due to their interaction and when they are simultaneously triggered, in block 3, a command is generated to shut off one phase of switch 4. Block 13 generates a single phase lockout signal, and block 5 gives a command to turn on the switched off phase of switch 4. A single phase off lock block is built from contacts of the switch 4 itself or on the basis of a relay of the phase position repeaters of the switch (RPV - the position relay is ON,

32

RPO - relay position Disabled). At the same time, B high-speed protection 1 memorizes the fact of its activation for a time sufficient to complete the AR cycle. At this time, in block 6, the voter’s triggering of the damaged phase occurs (i.e., remembering that the voter has triggered). However, since block 7 does not fix the triggering of two voters, no further passage of the signal occurs.

In the event of a two-phase short circuit. on the ground, the speeds of skinny protection 1 and voters 2 reacting to biphasic short-circuit are triggered with the ground. It may be the same.

voters that are used to detect one damaged phase, for example, distance voters, voltage selectors, then their corresponding pair is triggered

(phases AB, BC or SA). It is possible to use special voters of damaged phases operating in two-phase short-circuit phases. to the ground, for example filter voters. In any case, a damaged pair of phases is detected and, according to these signals, in block 3, commands are generated to turn off the two damaged phases of switch 4. Block 13 does not work, but instead

Block 14 is triggered, locking off two phases of switch 4 on the basis of the position of its block contacts or repeaters (RPT and RPO). Based on this fixation in block 12

a command is generated to turn on the two disconnected phases of the switch 4, provided that there are no commands to turn off the three phases of the switch 4 from the block 9. At the same time

a time sufficient to complete the automatic reclose cycle, the protection triggers 1 are fixed, and on this basis, in block 6, the voters triggering occurs. In the specified case. Remember that the response of two remote voters, one by voltage, or one filter one corresponding to a pair of damaged phases. On these signals, in block 7, the fact that the short circuit is detected is detected. to earth biphasic. Further action depends on the state of block 10, which controls the amount of active power flow over

power lines before the occurrence of short circuit If the magnitude of the power flow exceeds a certain limit, determined by the condition of maintaining stability in the short-term disconnection of two phases (by calculation or a full-scale experiment), then block 10 to the moment of short circuit. It is in the activated state and remains in this state for some time after the occurrence of the short-circuit. and going into an incomplete phase mode due to the presence in the memory block for a time sufficient to provide further operations, namely, to pass the command to block 9 acting to turn off the three phases of the switch 4. As a result, the third phase of the switch 4 is turned off almost simultaneously with the first two.

At the same time, block 9 acts on pre-20 switch 4. The need to complement command 12 in command formation unit 12 to turn on the two phases of switch 4. If before the occurrence of a short circuit. the flow of active power along the line does not exceed the limit determined by the preservation of stability in the short-term shutdown of two phases, then after fixing the voters' response in block 6 and revealing a two-phase short-circuit. on the ground in block 7, block 10 does not issue a F signal to block 9, the command to turn off the three phases of the switch 4 does not arrive and the line goes into single-phase mode, which is fixed by block 14, and then, by its signal, block 12 generates a command to turn on two disconnected phases of the switch 4. To eliminate false three-phase trips that may occur due to the possible operation of the unit 10 in an incomplete-phase mode, it is necessary to block its operation: one is instantaneous from the fast-acting protection,

Most of the control and stability in the incomplete phase mode is due to the error in determining the limit value of the power in the preceding short circuit. mode and increased reliability in avoiding stability disturbances in the non-phase mode. If k.z. without zero components, then block 8, which reveals this

act, immediately translates the action of protection 1 to block 9 of a three-phase disconnection with the subsequent prohibition of SAPE and CAP from it.

Claims (1)

Invention Formula 40 , - from the block 14 fixing off two phases. The operation of unit 10 in an incomplete phase mode is possible, since the power flows allowed in the non complete phase mode may be higher than the allowable power values in the previous mode, at which stability is maintained during the subsequent two phase short circuit. on the ground and short-term short circuit of two phases. In addition, depending on the type of specific measuring device, it can measure the distorted value of the power of a two-phase automatic reclosing of the power line, containing high-speed protections associated with them, the number of damaged phases, the fixing unit of their operation, and a three-phase shut-off detection unit associated with a three- to 45 phase shut-off unit, which is connected to the operational circuit of the switch, a single-phase breaker block, connected to Analogue with damaged phase selectors and a response lock unit and on-off switch tripping circuits, a two-phase earth fault detection unit associated with the voters response lock unit, a single-phase shutdown lock unit associated with the reclosing unit A single phase switch, characterized in that, in order to expand the functional ti, unfounded work and give the command to disconnect. In the non-phase mode, the permissible power flow is monitored by a special unit 11, which is entered after fixing the two phases off in block 14. The block 11 controls the stability of the power line in the non-phase mode, in the indicated case single-phase. If it fixes the beginning of the violation of stability or approach to this process, then through it a signal is given in block 9, which conducts the shutdown of the remaining phase. If the violation of stability is not fixed by block 11, then block 9 of the third phase shutdown does not produce and block 12 forms a command to turn on the two disabled phases switch 4. The need for additional-F Most of the control and stability in an incomplete phase mode is due to the error in determining the limit value of the power in the preceding short circuit. mode and increased reliability in avoiding stability disturbances in the non-phase mode. If k.z. without zero components, then block 8, which reveals this act, immediately translates the action of protection 1 to block 9 of a three-phase disconnection with the subsequent prohibition of SAPE and CAP from it. Invention Formula switch 4. The need for additional-F A two-phase automatic reclosing of the power line, containing high-speed protections associated with them electing damaged phases, a block for fixing their actuation 1.11, and a block for detecting the need for a three-phase shutdown associated with the three-phase shutdown unit, which It is connected with the operative switch circuits, the switch-disconnecting unit with phase breakdown, connected with the affected phase selectors and the triggering fixation unit and with the operating switch-disconnecting circuit, two-phase detection unit s earth faults associated with the block lock actuation voters fixing unit interrupting of one phase of the circuit breaker associated with the reclosing block of one phase of the switch, characterized in that, in order to expand functional 513 OALV device capabilities, consisting in the implementation of a two-phase automatic reclosing of the transmission line with two-phase short circuits on the ground on it with stability, the control units of the previous power and power in the incomplete-phase mode, the two-phase off-key lock and two reclosing phases, while the two-phase earth fault detection unit is connected to the enable input of the control unit of the previous power and the first input Editor I. Shulla Compiled by N, Panteleev Tehred L. Serdyukova Proofreader A. Zimokosov Order 1975/52 Circulation 619 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 - VMik "..„ Production and printing company, Uzhgorod, st. Design, And 36 a co-power unit in non-phase mode and through them with a three-phase switch-disconnecting unit that is connected to the blocking inputs of a single-phase reclosing unit and a two-phase reclosing unit of the switch, allowing the input of which is connected to the output of the two-phase latching lock unit, which is connected to the second input of the power control unit in the non-phase mode and to the first blocking input of the control unit of the previous power, the second blocking input of which connected with high-speed protection.