RU5687U1 - DEVICE FOR REMOTE CONTROL OF THE CIRCUIT BREAKER - Google Patents

Abstract

A device for remote control of a circuit breaker, comprising a closing circuit formed by a series-connected NC contact of a blocking relay against multiple switching, an NC blocking contact of a circuit breaker and a coil of a contactor of its drive, a circuit of circuit formed by a series-connected circuit-closing contact of a circuit breaker and a coil of its tripping electromagnet, a key control with first and second make contacts, make contact of protection relay, monitoring relay of switching circuit, coil winding It is connected in series with the first resistor, a trip circuit monitoring relay, the winding of which is connected in series with the second resistor and a trip circuit, a multi-turn-on relay, whose winding is connected through its own make contact in series with the circuit formed in parallel by the first make contact of the control key and a make contact of the automation relay, characterized in that two isolation diodes are additionally introduced into it, while the first make contact the act of the control key and the closing contact of the automation relay through the first isolation diode are connected to the switching circuit, the coil of the monitoring relay of the switching circuit and the first resistor are connected in parallel to the circuit from the first closing contact of the control key and the first isolation diode in series, and the coil of the interlock relay from multiple switching is connected in series with a circuit formed in parallel by the second closing contact of the control key and the closing contact of the protection relay, which through

Description

DEVICE FOR REMOTE CONTROL OF THE CIRCUIT BREAKER

The utility model relates to devices for remote control of commercially available devices in high voltage electrical installations and can be used for remote control of switches with electromagnetic drives and signaling, and their position.

Known devices for remote control of switches with electromagnetic drives and signaling their position, containing a switching circuit, a tripping circuit, a control key, a monitoring relay of a switching circuit / position relay disconnected /, a monitoring relay of a switching circuit / position relay turned on / and blocking from repeatedly turning on the switch / blocking from jumping / l, 2l. To perform blocking from repeated switching on, these devices use either the block contacts of the electromagnet disconnecting the drive of the circuit breaker, which causes a risk of overheating and damage to its winding during long pulses for switching on, or double-wound intermediate relays are used, which complicates their circuit.

Closest to the claimed device is a remote control circuit breaker in which a single winding intermediate relay Z is used to perform blocking from repeated switching on. The winding of this relay is connected in series with the make contact of the output intermediate protection relay and, through its make contact, is connected to make make contacts in parallel control key and automation relay, giving pulses to turn on the switch, and the opening contact of its inclusion sequentially in the winding circuit of the contactor of the drive.

Such a device provides blocking of the circuit of the circuit breaker in the presence of long pulses for its inclusion, only when the circuit breaker is disconnected from the relay busy. When the 2 research institutes of the circuit breaker are disconnected from the control key and there are malfunctions that cause the supply of long pulses to turn on from the control key or automation devices, the circuit breaker will turn on again, because The winding of the interlock relay from repeated activation in this case does not receive power. A disadvantage of the device is also an increase in the time for switching off short circuits by a switch under the action of relay protection; it additionally includes the response time of the interlock relay.

The objective of the utility model is to increase the reliability of the device for remote control of circuit breakers by blocking the switching circuit during a long-term occurrence of a switching pulse and disconnecting the KSIK circuit breaker from relay protection, as well as from the control key and reducing the time it takes for the circuit breaker to disconnect from relay protection.

The essence of the claimed utility model is as follows. The drawing shows a diagram of a device for remote control of the switch. It contains the switching circuit I, the switching circuit 2, the control switch 3, the monitoring relay of the switching circuit 4, the monitoring relay of the switching circuit 5, the blocking relay b from repeatedly turning on the circuit breaker, the first 7 and second 8 isolation diodes, the first 9 and second 10 resistors.

The switching circuit I, formed by the interlocking contact 6.1 of the blocking relay b, the opening blocking contact is turned off for II and the winding of the drive contactor 12, is connected through the first diode 7 to the first closing contact 3.1 of the control key 3 and the closing contact of the automation relay 13 connected in parallel to each other .

Tripping circuit 2, formed in series with the closing blocking contact of the circuit breaker 14 and the winding of the tripping electromagnet 15, is connected via the second isolation diode 8 to the second closing contact 3.2 connected in parallel with the meldo

- 3 control keys 3 and the make contact of the protection relay 16.

The coil of the control relay of the switching circuit 4 and the first resistor 9 connected in series with it are connected in parallel with the circuit formed by the first resistor diode 7. The winding of the control relay of the switching circuit 5 and the second resistor connected in series with it 10 are connected in parallel with the circuit formed in series connected by the second after the contact pin 3.2 of the control key 3 and the second isolation diode 8.

The winding of the lockout relay b from repeatedly turning on the circuit breaker is connected in series with a circuit formed in parallel by a second making contact 3.2 of the control key 3 and a making contact of the protection relay 16, and through its making contact 6.2 is connected in series with the circuit formed in parallel with the first lapping contact 3.1 of the control key 3 and the closed contact of the automation relay 13, and is connected in parallel with the dividing diode 7 and 8 and the switching circuits I and disconnection 2.

The device operates as follows.

With the open position of the switch, the open state of the contacts 3.1 and 3.2 of the etching key 3, the open state of the contacts of the automation relay 13 and the protection relay 16, the coil of the interlock relay 6 is de-energized, the switching circuit I is closed by contact 6.1 of the interlock relay 6 and the block contact of switch II, and the trip circuit 2 is open by the contact block of the switch 14. The current flows through the circuit: the first resistor 9, the coil of the monitoring relay of the switching circuit 4, terminal 6.1 of the locking relay 6, the contact block of switch II and the coil of the contactor of the drive 12. Relay control circuit incorporating 4 is energized, indicating good condition of the circuit breaker and the off position, the control circuit disconnect switch 5 is de-energized, the drive contactor 12 does not work, because . 4, the current flowing through its winding turns out to be insufficient for the contactor to operate. Contact 6.2 interlock relay 6 is open. To turn on the switch, contact 3.1 of the control key 3 / closes when manually turned on / or the automation relay contact 13 / when turned on from automation devices /. In this case, the current flows through the circuit: or contact pe / ieaSroMorruicii / 5. contact 3.1 of the control key 3 is a dividing diode 7, contact 6.1 is a blocking relay b, the contact block of circuit breaker II and the coil of the contactor of the drive 12. The current in the coil of the monitoring relay of the switching circuit 4 is interrupted and it returns to an idle state, the contactor of the circuit breaker drive is tripped, the circuit breaker is closed. After the switch is turned on, its block contact P in the switching circuit I opens and the block contact 14 in the trip circuit 2 closes, the coil of the contactor of the drive 12 loses power, and it returns to its original state. The current flows through the circuit: the second resistor 10, the winding of the trip circuit monitoring relay 5, the contact block of the switch 14 and the winding of the trip electromagnet 15. The trip circuit monitoring relay 5 is activated, signaling the condition of this circuit and the on state of the circuit breaker, and the trip electromagnet 15 is not working because the magnitude of the current flowing through its winding is insufficient for the operation of the electromagnet. Contact 3.1 of the control key 3 / or contact of the automation relay 13 / is permitted. To disconnect the circuit breaker, contact 3.2 of the control key 3 is closed / for manual shutdown / or contact of the protection relay 16 / for automatic shutdown /. In this case, the current flows through the circuit: terminal 3.2 of the control key 3 or the contact of the protection relay 16, the diode 8, the block contact of the switch 14 and the coil of the electromagnet 15. The current in the winding of the monitoring relay of the switching circuit 5 is interrupted and it returns to an idle state, the shutdown electromagnet circuit breaker trips, circuit breaker trips.

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Switch on again. Blocking relay 6 is activated, opens its contact 6.1 in the switching circuit I and closes contact 6.2. However, when the contact 3.1 of the control key 3 and the contact of the automation relay 13 are open, the self-holding circuit of the interlock relay 6 is not assembled through its contact 6.2.

After the circuit breaker is closed, its block contact II in the switching circuit I closes and the block contact 14 in the opening circuit 2 opens, the winding of the electromagnet 15 loses the pitacme and it returns to its original state. The contact 3.2 of the control key 3 / opens or the contact of the protection relay 16 / opens, the coil of the interlock relay 6 loses power, its contact 6.1 closes in the switching circuit I and the contact 6.2 opens. The current flows through the circuit: the first resistor 9, the coil of the monitoring relay of the switching circuit 4, terminal 6.1 of the locking relay 6, the contact block of the circuit breaker II and the coil of the contactor of the drive 12. The monitoring relay of the switching circuit 4 is activated, signaling the condition of this circuit and the disconnected position of the switch.

If at the moment of applying the pulse to disconnect the switch from terminal 3.2 of the control key 3 or from the contact of the protection relay 16 and the relay 6 is activated, terminal 3.1 of the control key 3 or terminal of the automation relay 13 are closed, then the self-holding circuit of the relay 6: terminal 3.1 control key 3 or contact of the automation relay 13, contact 6.2 and winding of the interlock relay 6. The interlock relay 6 remains activated after the circuit breaker is opened and the circuit opens: that 3.2 control key 3 / or contact of the protection relay 16 /. With its contact 6.1, this relay keeps the switching circuit I open until the switching pulse is removed from terminal 3.1 of the control key 3 or from the contact of the automation relay 13. By the time the circuit breaker is closed and its block contact II is closed, the switching circuit I is open by terminal 6.1 of the blocking relay 6 and the switch will not be able to turn on in case of malfunctions that cause the supply of long pulses to turn on.

- b The power circuit of the winding of the monitoring relay of the circuit 4 is also open by contact 6.1 of the blocking relay 6. As a result, after the circuit breaker is turned off, the monitoring relay of the circuit 6 does not work and an alarm about the working condition of this circuit does not appear.

The lockout relay b will return to an unworked state after a pulse has been taken to turn on the control key 3 from terminal 3.1 or the automation relay contact 13. At the same time, its contact 6.2 opens and contact 6.1 closes in the switching circuit I, it receives power and the relay for monitoring the switching circuit 4 is activated.

Thus, when blocking from repeatedly turning on the circuit breaker using a single-wound intermediate relay, the circuit is blocked when the on-time pulse appears for a long time and the circuit breaker is disconnected both from relay protection and from the control key, and the status of the closing contact of the blocking relay in the circuit of the circuit breaker is controlled by the relay control circuit, which increases the reliability of the device for remote control of the circuit breaker, reduces the trip time lyuchatelya of relay protection, as the trip time of the interlock relay is excluded from the total short-circuit trip time.

YELLOW

1.Gumin I.Ya., Gumin M.N., Ustinov V.F. Secondary circuits of power plants and substations. M .: Energy, 1964 / pic. 3.3 /.

2. The electrical part of the stations and substations. Ed. A, A. Vasilieva. M .: Shergia, 1980 / fig. 31-14 /.

3. The electric part of power plants. Ed. S.V. Usova. L .: Shergia, 1977 / fig. 8-15 /.

Claims (1)

A device for remote control of a circuit breaker, comprising a closing circuit formed by a series-connected NC contact of a blocking relay against multiple switching, an NC blocking contact of a circuit breaker and a coil of a contactor of its drive, a circuit of circuit formed by a series-connected circuit-closing contact of a circuit breaker and a coil of its tripping electromagnet, a key control with first and second make contacts, make contact of protection relay, monitoring relay of switching circuit, coil winding It is connected in series with the first resistor, a trip circuit monitoring relay, the winding of which is connected in series with the second resistor and a trip circuit, a multi-turn-on relay, whose winding is connected through its own make contact in series with the circuit formed in parallel by the first make contact of the control key and a make contact of the automation relay, characterized in that two isolation diodes are additionally introduced into it, while the first make contact the act of the control key and the closing contact of the automation relay through the first isolation diode are connected to the switching circuit, the coil of the monitoring relay of the switching circuit and the first resistor are connected in parallel to the circuit of the first closing contact of the control key and the first separation diode in series, and the coil of the blocking relay from multiple switching is connected in series with a circuit formed in parallel by the second closing contact of the control key and the closing contact of the protection relay, which through A swap diode is connected to the trip circuit.