SU803073A1 - Unit for permitting automatic reclosing of bus-bars provided with device for redundancy of failures of switches - Google Patents

Description

(54) AUTOMATIC AUTHORIZATION UNIT

REPEATED INCLUSION OF TIRES SUPPLIED BY THE DEVICE OF RESERVATION OF FAILURES OF THE SWITCHES

The two connections connected to the buses through a disconnector and a switch containing a source of operating current, two control relays for no voltage on the tires, an operation time relay and an output relay are entered according to the connection number of the Fault Relay selection relay, disconnector disconnection relay, time relay, intermediate return relay, intermediate relay operation, and the winding of the relay of selection of the failed connection is designed to connect to the source of operating current through the closing contact you of the current breaker breaker relay, in parallel which are connected in series the first closing contact of the failure connection selection relay and the first disconnecting contact of the intermediate return relay, the winding of which is connected to the operating current source through the closing with time delay contact of the return time relay, which winding is connected to the operating current source through the closing the contact of the first relay of the voltage test on the wrenches, wherein the winding of the operation time relay is connected in series through the second closing contact of the fail-connection selection relay with the disconnecting contact of the first relay of the absence of voltage on the wiring, is intended for connection to the disconnecting contact of the test of the absence of current in the failing connection circuit of the breaker failure detector; the time-delay contact of the time-response contact connected to the operating current source through the connected last the first closing contact of the intermediate response relay and the second disconnecting contact of the intermediate return relay; the disconnector coil winding is connected to the operating current source via the second closing contact of the intermediate response relay connected in series with the third closing contact selection relay of the failed connection, in parallel with which the first closing contact of the relay is connected disconnect switch, the output relay is designed to connect to the operating current circuits through the disconnector disconnect contact, the second closing contact of the disconnecting relay and the third closing contact of the intermediate operation relay are connected in series to the disconnecting circuit, and the third closing contact of the disconnecting relay and closing contact of the output relay are connected in series to the APV circuit breaker tires.

The drawing shows a schematic diagram of the operational circuits of the device, a circuit for connecting a relay for checking the absence of voltage on the tires, and a diagram of the output circuits of the device.

The device contains relay FP1 selection relays connected to the source of operational current, intermediate relay RP2, intermediate relay reset RPZ, relay disconnecting switch RP4, output relay RP5, response time PB1, relay return voltage PB2 and no test relay stress on PH1 and PH2. In addition, the output relay and check relay contacts are included in the operational circuits of the device

the absence of the current of the fail-safe switch backup device (Breaker failure prevention) of the PUR and RTurov switches and the disconnector contact P closed in its disconnected state.

The device works as follows.

Q In the presence of a breaker failure from LEVER, a signal is received in the form of a contact closure of its output relay RPurs, which energizes the winding of the RP1 relay and puts the device into operation. Relay RP1 self-holding through its closed contact

 WP1 | and a closed contact of the intermediate relay return Pn3i. Another closed contact РП1а starts the operation time of РВ1, when the РН1 and РТуров contacts are closed, i.e., when there is no voltage on the wiring and no current in the circuit of the failed connection. After a certain time delay, the contact PB1 is activated and energizes the RP2 relay, which self-holds through its closed contact RP2 | and closed contact RPZg. Other

5 closing contact RP22 closes the power supply circuit of the RP4 relay, which, on condition that the starting relay Pills triggers, is self-holding through the RP4 closing contact | and sends a signal to the blocking circuit of the disconnectors for shunting block-koitaktov of the failed switch, as well as when the relay RP2 is triggered - to disconnect the bus disconnector in the circuit of the failed connection. A closed contact P of the disconnector at the same time, fixing its disconnection, energizes the output relay FP5, which generates a signal when the FP4 relay operates to turn on the switch of one of the serviceable connections that re-enables the buses. When the voltage is restored on the tires, the PH1 and PH2 relays are activated, which with their contacts prepare for the return of the РВ1 m РП2 relay and start the reset time relay РВ2. If successful, the auto-reclosing busses of the PB2 relay, after a certain time delay, energize the RPZ relays, which, with their normally open contacts, bring the device to the initial state.

The device can be made on relay-contact elements or on semiconductor contactless elements of the series “logic T.

The advantage of the proposed device is the practical elimination of cases of unsuccessful auto-reclosing of tires with the above damage combination, the probability of which is quite large and can be determined accordingly. This leads to a significant reduction in the duration of interruptions in power supply to consumers, which gives a certain economic effect.

Claims (2)

Invention Formula The block for enabling automatic reclosing of buses equipped with a device for failover backup of switches with an output relay and a relay for the absence of current in the circuit of the failed connection connected to the buses through an isolator and a switch containing a source of operating current, two control relays for the absence of voltage on the buses, the time relay and output relay, characterized in that, in order to reduce the duration of power interruptions, it is entered according to the number of connections of the selection relay of the failed connection and, a disconnecting relay, a return time relay, an intermediate return relay, an intermediate response relay, and the winding of the failover connection selection relay is intended to be connected to the operating current source via the closing contact of the output relay ROV, in parallel with which the failing selection relay connected in series are connected connection and the first disconnecting contact of the intermittent return relay, the winding of which is connected to the operating current source through the A time-delayed contact of the timeout relay contact, the winding of which is connected to the operating current source through the closing contact of the first voltage test relay on the threads while the operation time relay winding is connected in series through the second closing contact of the failure connection relay to the break contact of the first relay of the test voltage on tires designed for 5 connections to the disconnecting contact of the relay for checking the absence of current in the circuit of the failed connection from the breaker failure detector, and parallel to the winding of the operation time relay, connected in series the winding of the intermediate operation relay 0 and closing with a time delay of the time relay contact, connected to the operating current source through the first closing contact of the intermediate operation relay and the second disconnecting contact of the intermediate return relay connected in series, the disconnecting relay coil to the operating current source through the second closing contact of the intermediate response relay, connected in series 0 with the third closing contact of the failing connection selection relay, in parallel with which the first closing contact of the disconnecting relay is connected, the output relay is used for connecting the operating current to the circuits via the disconnector disconnecting contact, the second closing contact of the disconnecting relay and the third opening are connected in series the contact of the intermediate operation relay is intended to be connected to the disconnecting circuit, and the third connected in series ayuschy disconnector disconnecting relay contact and normally open contact relay output - a circuit breaker incorporating reclosure tires. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 406258, cl. H 02 H 3/06, 1970. 2. Typical relay protection schemes for substation elements 110-220 kV. No. 5472TM-TI No. 7766TM and “Protection of Tires and Breakdown Levels of the Substation Elements of the PO kV No. 9322TM-1, No. 9337TM-1, Energosetproekt, 1974. 220 V (ON) L I I GP GP t La Oshk / 1Yu (/ en1 / e times connect In the scheme 6 / ioKupoS / (u rose ı edimi1t e e1 / On 6K / ifOve ve 6yk /} u / a / 77e / 7l Auto Burner