RU2363086C1 - Device for automatic switching on of section switch - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention relates to the area of electric engineering and can be used in automatic transfer switches to backup supply and equipment (ATS). Device for automatic switching on of section switch uses interposing relay without return delay; single-acting operation is ensured by relay retaining circuit till switching on of section switch and opening of its auxiliary contact. There's no need to set relay to required time of its return to initial condition and thus failure and false ATS tripping are excluded due to incorrect selection of return time or incorrect relay setting.

EFFECT: optimisation of serviceability and reliability of ATS operation.

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Description

The invention relates to a device for automatically turning on the backup power and equipment (ATS) and is intended to automatically turn on the sectional switches.

Known devices for automatically turning on a sectional switch, ensuring its automatic switching on when a power input switch is switched off to a busbar section for any reason [1, p.132, fig. 2-6; 2, p. 369, fig. 11.1]. Such devices provide a one-time inclusion of a sectional switch using a special one-shot relay, which is used as an intermediate relay with a delay when returning.

Closest to the claimed device is a device for automatically turning on a double-acting sectional switch [3, p. 366, Fig. 10.15], containing an intermediate relay with deceleration upon return, which uses a make contact, auxiliary make contacts (block contacts) of the input switches power supply to busbar sections, auxiliary disconnect contact (block contact) of the sectional switch and electromagnet for switching on the sectional switch.

The time of the return of the single-acting relay and the opening of its contact in the circuit solenoid for switching the sectional switch is selected so that it with some margin exceeds the turn-on time of the sectional switch. At the same time, it should ensure reliable switching on of the sectional switch from the ABP device and exclude the possibility of its repeated switching on after disconnection from relay protection in the event of a stable short circuit (SC) on busbar sections. Therefore, by the time the sectional switch is turned off by the action of relay protection in the case of a stable short circuit on the busbar section, the circuit of its switching solenoid should be open by the contact of the single-acting relay.

The magnitude of the return time of the single-acting relay in each particular case depends on the turn-on time of the sectional switch and on the duration of its relay protection and, therefore, changes when their values change. This requires appropriate configuration of the ABP devices during their operation, as an underestimated value of the return time of a single-acting relay will cause a failure in the operation of the ATS device, and an overestimated value will cause the sectional switch to turn on a stable short circuit on busbars again.

The objective of the invention is to improve the usability and reliability of the device ABP sectional switch.

This task is achieved in that the device for automatically turning on the sectional switch, comprising the closing and opening auxiliary contacts of the power input switches to the first and second section of the busbars, the winding and the closing contact of the intermediate relay, the opening auxiliary contact of the sectional switch and the coil solenoid for switching on the sectional switch, the first output of the intermediate relay winding through series-connected interconnecting auxiliary contacts switch input power to the first and second sections of busbars is connected to the positive pole of the source of operational current, which is connected via a make contact of the intermediate relay to parallel disconnecting auxiliary contacts of the switch input power to the first and second sections of busbars, characterized in that as An intermediate relay is used by a relay without deceleration upon return, the first winding of which, through the make contact of the same relay, is connected to the positive pole of the source the operating current, and through parallel disconnecting auxiliary contacts of the input switches to the first and second sections of the busbars connected to the first terminal of the coil solenoid switch sectional switch, and the negative pole of the operating current source through the auxiliary auxiliary contact of the sectional switch connected to the second terminal of the intermediate winding relay and with the second output of the winding of the electromagnet turning on the section switch.

The invention consists in the following. Figure 1 shows the wiring diagram, on the sectional switch which uses an ABP device. The circuit contains transformers 1 and 2, transformer 1 switches on the power supply side 3 and at the input to the busbar section 4, transformer 2 switches on the power supply side 5 and at the input to the busbar section 6, as well as a sectional switch 7.

Figure 2 shows a diagram of the device ABP sectional switch. The device contains make-up 4.1 and make-up 4.2 auxiliary contacts of the power input switch to the first section of busbars 4, make-up 6.1 and make-up 6.2 auxiliary contacts of the power input switch to the second section of bus-bars 6, make-up auxiliary contact 7.1 of the section switch 7, winding 8 and make-contact 8.1 an intermediate relay, the winding of the electromagnet turning on 9 section switch 7, positive 10 and negative 11 poles of the operating current source. The positive pole 10 of the operating current source through the series-connected auxiliary auxiliary contacts 4.1 and 6.1 of switches 4 and 6 and the parallel contact 8.1 of the intermediate relay connected to it is connected to the first output of the intermediate relay winding 8, which through parallel connected interconnected auxiliary contacts 4.2 and 6.2 switches 4 and 6 are connected to the first output of the winding of the electromagnet turning on 9 section switch 7, and the second conclusions of the windings of the intermediate relay 8 and the electron switch 9 through the NC 7.1 of the section switch 7 is connected to the negative pole 11 of the operating current source.

The device operates as follows.

In normal mode, both transformers are in operation, and the section switch 7 is turned off. As a result of the on state of switches 4 and 6, their auxiliary contacts 4.1 and 6.1 are closed, and auxiliary contact 7.1 of the section switch 7 is also closed. Current flows through the winding 8 of the intermediate relay. The intermediate relay is in the tripped state, and its contact 8.1 in the self-holding circuit is closed. Auxiliary contacts 4.2 and 6.2 of switches 4 and 6 are open, current does not flow through the winding of the solenoid 9 to turn on the section switch 7.

When the power input switch 4 is disconnected for any reason, the auxiliary section 4.1 opens in the first section of the busbars in the power circuit of the winding 8 of the intermediate relay and the auxiliary contact 4.2 closes in the winding circuit of the electromagnet of switching on the 8 section switch 7. Through the closed contact 8.1 of the intermediate relay, the closed auxiliary contact 4.2 of switch 4 and a closed auxiliary contact 7.1 through the winding of the electromagnet turning on 9 of the section switch 7, current flows. In this case, the intermediate relay is maintained in the tripped state through its make contact 8.1. The sectional switch 7 is turned on, as a result of which its auxiliary contact 7.1 opens. The winding 8 of the intermediate relay and the winding of the electromagnet turning on 9 of the sectional switch 7 lose power. Contact 8.1 opens in the self-holding circuit of the intermediate relay.

If the sectional switch 7 is turned on to a stable short circuit on the first section of busbars, it will be disabled by the action of its relay protection. The auxiliary contact 7.1 of the section switch 7 will close, but the repeated action of the ABP device to turn it on will not occur, because the power supply circuit of the switching solenoid 9 will be opened by the contact 8.1 of the intermediate relay and the auxiliary contact 4.1 of the input switch 4 to the first section of the busbars.

The ABP device works similarly when the power input switch 6 to the second section of the busbars is disconnected for any reason. The only difference is that in this case the auxiliary contact 6.1 opens and the auxiliary contact 6.2 of the switch 6 closes.

Thus, the proposed device ABP provides a single turn-on of the sectional switch by creating a self-holding circuit of the intermediate relay without slowing down when returning. The lack of time delay increases the convenience of operation and the reliability of the operation of the ATS device.

If necessary, the proposed device for automatically turning on a sectional switch can have voltage and frequency triggering organs, which are performed similarly to existing ABP devices [3]. It can also be used when supplying busbar sections from power lines when they are separately operated in normal mode.

LITERATURE

1. Berkovich M.A., Semenov V.A. Fundamentals of automation of power systems. M .: Energy, 1968.

2. Barzam A.B. System Automation. M .: Energoatomizdat, 1989.

3. Andreev V.A. Relay protection and automation of power supply systems. M .: Higher. school., 2006.

Claims (1)

A device for automatically turning on a sectional switch, comprising the closing and opening auxiliary contacts of the power input switches to the first and second section of the busbars, the winding and the closing contact of the intermediate relay, the opening auxiliary contact of the sectional switch and the coil of the electromagnet turning on the sectional switch, the first output of the intermediate relay winding through sequentially interconnected closing auxiliary contacts of the power input switches on the first and the second section of the busbars is connected with the positive pole of the operating current source, which is connected through the make contact of the intermediate relay to the parallel and interconnecting disconnecting auxiliary contacts of the power input switches to the first and second sections of the busbars, characterized in that the relay without deceleration is used as an intermediate relay upon return, the first output of the winding of which through the make contact of the same relay is connected to the positive pole of the operating current source, and through the parallel The disconnecting auxiliary contacts of the input switches to the first and second section of busbars that are separately interconnected are connected to the first terminal of the coil solenoid to turn on the sectional switch, and the negative pole of the operating current source is connected to the second terminal of the intermediate relay winding and to the second terminal of the winding through the auxiliary terminal of the sectional switch electromagnet turning on the sectional switch.

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