SU1394262A1 - Device for controlling high-voltage circuit-breaker - Google Patents

Abstract

The invention relates to devices for controlling the drive of high-voltage switches and other electrical apparatus. The purpose of the invention is to increase the reliability and simplicity of the device. After unlocking the iCTOpa 2 and setting the switch to the latch, the control pulse goes to the thyristor 4, which causes the thyristor 2 to be locked and the coil 1 of the activation drive to be turned off. The capacitor 3 is charged in the process of turning on the coil 1 through a resistor 8. When the switch is turned off, the thyristor 11 is turned on, which leads to the discharge of the capacitor 9 to the coil 10 of the drive actuator. The capacitor 9 is charged from the source 12 through the resistors 7 and 8 and the diode 5. The diode 5 prevents the discharge of the capacitor 9 when the voltage of the source 12 fluctuates and disappears, which increases the reliability of the device. The simplification of the device is achieved by eliminating chokes from its circuit. 1 il. with (L

Description

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The invention relates to devices for controlling high-voltage circuit breakers and other electrical apparatuses.

The purpose of the invention is to increase the reliability and simplify the device.

The drawing is a schematic diagram of the device.

The device contains a turn-on drive coil 1, a main thyristor 2, a switching capacitor 3 and a thyristor 4, separation diodes 5 and 6, resistors 7 and 8, an additional capacitor 9 used to power the turn-off drive coil 10, an additional thyristor 11 connecting the capacitor 9 to the coil 10 shutdown drive, pins 12 for switching on the power supply.

The device works as follows.

When a signal is turned on to the control electrode of the main thyristor 2, it is unlocked and a current begins to flow through the turn-on drive coil 1, which causes the switch to turn on. By this time, capacitor 9

manages to charge up to the voltage

power supply 12 via a thyristor 2, diode 6, a capacitor 9, a resistor 8, and the capacitor 3 is charged to the same voltage across the thyristor 2 circuit, a capacitor 3, a resistor 8.

When the switch is set to the On position, a signal is applied to the control electrode of the thyristor 4, which causes it to unlock, with the result that the capacitor 3 is connected to the thyristor 2 in the blocking direction. The thyristor 2 is closed, and the capacitor 3 is recharged by the current flowing from the source 12 through the thyristor 4 and the coil 1. When the recharging of the capacitor 3 is completed, the thyristor 4 is locked, since the current in its circuit is determined only by the resistor 8 and There is less holding current.

If methods other than shunting the coil with a reverse diode are used to suppress overvoltages, then after the thyristor 4 is locked, capacitor 3 is discharged through coil 1 and resistor 8. In this case, the direction of the current in coil 1 is opposite to what it was before that causes demagnetization

the core of the coil I. Thanks to this, the performance of the switch is turned off. - when the phone is switched on for a short circuit,

If the signal of the command Disconnected to the control electrode of the thyristor 11 is received, it will open and the capacitor 9 will be discharged. the coil 10, leads to the inclusion of the switch. Diode 5 and resistor 7 prevent the discharge of capacitor 9 due to the leakage current of the thyristor 11.

Thus, the proposed device has superior reliability in the process of shutting down, especially with operational power supply 12, when it is possible that when the switch is set to the Enabled state, the voltage of source 12 disappears due to a short circuit in the line switched by this switch. The simplification of the device is achieved by eliminating additional chokes from the circuit.

Claims (1)

Claims An apparatus for controlling a high-voltage switch, comprising leads for connecting a power source, a turn-on drive coil and a cut-off drive, a main thyristor, a switching thyristor and a capacitor, one of the turn-off coil leads of the power supply and the other end - with the cathode of the main thyristor, the anode of which is connected to the output for connecting the positive pole of the power source, characterized in that, in order to increase and reliability and simplification of the device, an additional thyristor and a capacitor, two diodes and two resistors are inserted, the anode of the switching thyristor is connected to the anode of the main thyristor, the cathode of the switching thyristor is connected to one of the switching capacitor, the other output of which is connected to the cathode of the main thyristor, the first resistor, the first diode, an additional capacitor and the second resistor form a series circuit, one of the terminals of the specified series circuit from the first resistor is connected to Above the dL is connecting the positive pole of Isto31394262 , nickname power, another output indicated by an additional capacitor a series circuit is connected to the second resistor, indicated by the common a negative-point connection between the additional condenser poles of the power supply, the anodor and the second resistor is connected additional thyristor connected to the cathode of the switching thyristor, to a common point between the indicated per-anode of the second diode is connected to a common vim diode and an additional condensate point between the drive coil and the switch on the cathode, the cathode of the additional thyristor and the main thyristor, and the cathode is connected to one of the terminals of the specified second diode carcass drive off, another high common point between the first diode and water which is connected to a common additional point capacitor.