SU425258A1 - DEVICE FOR DOUBLE AUTOMATIC REPEATED SWITCHING SWITCH - Google Patents

Description

one

The invention relates to an automatic device that is used in electrical networks and other electrical installations and is intended to re-enable electrical installations (for example, overhead, cable, and mixed transmission lines, transformers of all voltages, and so on) after their automatic shutdown, contains a time relay and capacitors.

The known devices of automatic reclosing (AR) of a double action with time delays of the first and second AR cycles, which provide double activation of the automatically disconnecting switches, for example, with spring drives, with automatic winding of springs, automatic motor gearboxes more time delay since the start of work zash, it is to shut off until the switch is completely turned off.

These two-way automatic reclosing devices use in their circuits block contacts of the shaft position, block readiness of the drive and block contacts emergency, ies, in the actuators of the switches (for example in the spring-loaded drives), which allow or prohibit the operation of individual relay circuits depending on the position of the switch shaft, the position of the drive springs, depending

whether the switch was turned off - manually or automatically, and from what protections the switch was turned off. In double-action automatic reclosing circuits, the energy of the pre-charged capacitors is used to power the coils of the individual relays included in the circuit, and the accumulator's energy accumulation time sufficient to operate the executive relay is chosen so that it prevents multiple reclosures.

The known two-time delay-reclosing devices are characterized by the complexity of the circuits caused by the use of two or more electrical relays, as well as by limiting the scope of their application to either direct or only alternating current.

In the proposed device to simplify

increasing the reliability and expanding the scope of application of the above-mentioned capacitors are connected to the power source through series-connected diodes, a resistor and a closing block contact of the shaft position

drive switch The switch-on electromagnet is connected to the discharge circuit of the first capacitor through a series-connected make-to-delay contact with a close-and-slip contact

time relay, breakdown) blocking contact of the drive shaft and closing contact readiness of the drive, and into the discharge circuit of the second condeptor is connected through series connected closing with time delay when closing the thrust contact of the same time relay, opening the shaft contact contact drive switch and closing the block-readiness drive.

The drawing shows a diagram of a device for double automatic re-activation of a switch.

The circuit is intended to carry out a double automatic reclosure by automatically switching off the switch, for example, with a spring drive, with automatic winding of the drive springs. Such a drive has in its design the following elements: a switch-on electromagnet, block contacts of the shaft position and drive readiness, block contacts emergency and an automatic motor gearbox.

The electromagnet of turning on 1 is intended for turning on the switch I act on the trip mechanism of the switch actuator, it allows the actuator springs to do work to turn on the switch. Switch 2 has two fixed positions A and B and is designed to implement the spring plant in one of two modes: in position A - spring plant without AR and in position B - spring plant from AR. The opening blocking contact 3 of the drive shaft, the closing block contact 4 of the drive shaft, the closing block contact 5 of the drive ready, the opening block contact 6 of the drive ready and the closing emergency block contact 7 are shown in the drawing when the switch is off and the drive springs not instituted. The motor 8 of the automatic motor gearbox automatically produces a factory of the drive springs if the disconnecting block contact 6 of the drive readiness is closed. In this case, the switch 9 connected to the control bus 10 of the alternating or direct current must be switched to the position B, which corresponds to the switched on AR, and the switch 2 must be switched to the position B. By switching the switch 9 to the position G disconnect the AR. When the springs are not automatically set, the switch 2 is switched to the position A by the electric motor 8 of the automatic motor gearbox. The breaker-blocking contact 3 of the drive shaft position opens the time relay 11 and the turn-on electromagnet 1 when the switch is turned off. The closing block contact 5 of the actuator readiness, when closing, prepares to turn on the switching on electromagnet 1 and time relay P. Time relay II has two closing contacts: closing with time delay, sliding contact 12 and closing with time delay stop contact 13. With closing contact with delay the time of the sliding contact 12 of the time relay II creates a discharge circuit of the precharged capacitor 14 through the turn-on electromagnet 1 coil to carry out the first AR cycle after turning off switch from the existing controls that allow reclosure. Using the time delay contact contact 13 of the time relay I, a discharge circuit of the precharged capacitor 15 is created through the turn-on electromagnet 1 to realize the second AR cycle after the unsuccessful first AR cycle. The closing block-contact 4 of the drive shaft pollutions creates a charging circuit for capacitors 14 and 15. Resistor 16 in the charging circuit for capacitors 14 and 15 limits the charge current through diode 17 and determines the rate of accumulation of charge by capacitors 14 and 15. Diode 18 prevents the discharge of capacitor 15 when the first reclosing cycle is performed. The opening blocking contact 6 of drive availability, when opened, disconnects the electric motor 8 of the automatic motor gearbox when the drive springs are wound up. The emergency closing block-contact 7 is opened when the switch is disconnected from the action of protections prohibiting the operation of the automatic recloser, as well as when the switch is disconnected by acting on the drive tripping mechanism manually or remotely, thus preventing the automatic reclosing.

The time delay set by time relay 11, using the time-delayed sliding contact 12, determines the time delay of the first reclosure cycle. The time delay set by time relay 11, by means of closing with time delay, the thrust contact 13 determines the time delay of the second AR cycle after the spring springs the electric motor 8 of the automatic motor gearbox. The time delay to the closure of the closing with a time delay of the thrust contact 13 is longer than the time delay to the closing of the closing with a delay of the sliding contact 12, which determines the sequence of operation of the automatic recloser of the first and second cycles. The busbars 10 and 19 are the source of electricity (direct or non-current voltage) to which the device described is connected.

The operation of the proposed device automatic reclosing of double action.

The initial position of the circuit shown in the drawing is taken as the moment when the switch is disconnected from the protection allowing the reclosure, the drive springs are set, switch 9 is in position B, and switch 2 is in position B. Condensers 14 and 15 are fully charged. Emergency auxiliary contact 7 is closed.

At the moment the switch is turned off, the opening blocking contact 3 of the position of the drive shaft closes and the closing block contact 4 of the position of the drive shaft opens. On the coil of the time relay 11 does not flow. Timer 11 will begin to sweep until it closes its contacts 12 and 13. The electric motor 8 of the automatic motor gearbox will not turn on, as the opening block contact 6 of the drive ready is open. When the closure of the time-delayed sliding contact 12 of the time relay I closes, a discharge circuit of the capacitor 14 is generated through the turn-on electromagnet 1. Under the action of a current pulse of the discharge of the capacitor, the turn-on electromagnet 1 turns on the switch and acts on the mechanism for disengaging its drive. The capacitor 14 is then completely discharged. When the switch is turned on, the disconnecting block-contact 3 of the drive shaft position and the closing block-contact 5 of the drive ready are closed and the closing block-pin 4 of the position of the drive shaft and the opening block 6 of the drive ready are closed. Breaking, tripping the block-contact 3 of the drive shaft breaks the chains of the coils of time relay II and the turn-on electromagnet 1. When the closing shaft-contact block 4 closes the position of the drive shaft, a discharge circuit of the capacitor 14 discharged during the first cycle of the ARF (capacitor 15 is not discharged) ). When closing the disconnecting blocking contact 6 of the drive readiness, the starting circuit of the electric motor 8 of the automatic motor gearbox is created. Time relay 11, de-energized, will return to its initial position its closing with time delay contacts 12 and 13. The capacitor 14 is charged and the drive spring springs are charged. If the first AR cycle was successful (the protectors no longer acted on the opening of the circuit breaker), after the end of the factory of the springs of the drive, the closing readiness contact of the drive ready 5 is closed, and the safety shutdown contact 6 of the drive ready opens, resulting the reducer and the electromagnet on circuit 1 were prepared. If the first cycle of the automatic reclosing was unsuccessful (the trip switch protection acted again), the drive springs factory will continue after the first cycle of the automatic reclosing until completion. Again, the time relay 11, which is turned on by the closed opening of the block contact 3 of the drive shaft and the closing block contact of the drive 5, will start counting the time before closing its closing with delayed time of the slipping contact 12 and the stop contact 13. When the shorting of the shorting with time delayed contact 12 of the time relay 11 will not turn on the switch, since the capacitor 14 discharged during the first cycle of the automatic reclosure did not have time to accumulate enough energy to operate the activation electromagnet 1. Capacitor 14 is fully discharged. When closing the time-delayed thrust contact 13 of the time relay 11, a discharge circuit of the capacitor 15 is created through the coil of the turn-on electromagnet 1. Under the action of the current pulse of the discharge of the capacitor 5, the turn-on solenoid 1 will turn on the switch and act on the tripping mechanism of its drive. The capacitor 15 is then completely discharged. When the switch is turned on, the disconnecting block-contact 3 of the drive shaft is closed and the closing block-contact 5 of the drive ready closes the short-circuit block contact 4 of the drive shaft and the disconnecting block 6 of the drive ready. Breaking, tripping the block-pin 3 of the drive shaft breaks the chains of the coils of time relay 11 and the turn-on electromagnet 1. When the closing shaft-blocking contact 4 is closed, the drive shaft of the capacitors 14 and 15 is created. The starting circuit of the electric motor 8 of the automatic motor gearbox is created. Time relay 11, having deenergized, will return to its original position its closing contacts 12 and 13 with time delay. Capacitors 14 and 15 are charged and the drive spring springs are charged. If the second AR cycle was successful (the protection didn’t act more on the switch opening), then after the end of the factory of the drive springs: the 3 blocking standby contact 5 is closed, and the shutdown block 6 of the drive ready is opened, as a result of which the electric motor 8 is disconnected the motor reducer and the electromagnet connection circuit is prepared 1. After the termination of the charge of the capacitors 14 and 15, the device will be ready for the next two cycles of AR; If the second AR cycle was unsuccessful (the circuit breaker trips again acted), then just as after the unsuccessful first AR cycle, the drive springs were wound up, and time relay 11 starts counting the time before closing its closure with delayed slipping contact 12 and stop contact 13. When closing the closing with time delay of the slipping contact 12 of the time relay 11, the switch does not turn on, since the capacitor 14 n, re-discharged during the second cycle of AR (through separation diode 18) time to accumulate enough energy to operate the electromagnet incorporation 1. Capacitor 14 thus completely discharge Dietz. When the stop contact 13 of the time delay closing contact 13 of the time relay 11 is closed, a discharge circuit of the capacitor 15 is created through the turn-on electromagnet 1. The capacitor 15 is completely discharged through the turn-on electromagnet. But since the energy accumulated by the capacitor 15 during the operation of the protection to open the circuit breaker after an unsuccessful second reclosure cycle is not enough for the operation of the turn-on electromagnet 1, the circuit breaker does not turn on.

To turn on the switch after repairing the damage on the electrical installation, switch 9 is turned to the position and the switch is turned on manually (on site or remotely). If the switch is turned on, switch 9 is switched to position B, so that the automatic reclosure is turned on. After the plant springs the drive and the charge of the capacitors 14 and 15, the circuitry of the automatic reclosing device is ready for the next two reclosing cycles.

Subject invention

A device for two-time automatic reclosing of a switch, for example, with a spring drive, containing a source of electricity, a time relay and capacitors, the discharge energy of which is used to operate the switch-on electromagnet, characterized in that, in order to simplify, increase reliability and extend the area of application, the capacitors are connected to the power source through series-connected diodes, a resistor and a closing contact of the position of the actuator shaft of the switch, electromagnet the switch on switch is connected to the discharge circuit of the first capacitor through a series-connected closing with time delay when closing the time relay slip contact, opening the switch shaft position contact contact and closing the drive readiness contact terminal, and to the second capacitor discharge circuit sequentially connected closing with time delay when closing the thrust contact of the same time relay, disconnecting the blocking contact position of the actuator shaft of the switch and closing the blocking contact Prospect Drive is ready.