Thyristor electronic board for failure current limiter

Abstract

The present invention provides a failure current limitator thyristor electronic board. The thyristor electronic board TE provided in the invention has the following functional characteristics: 1) strong anti-electromagnetic interference capability; 2) the thyristor electronic board TE has low power consumption; 3) special thyristor trigger and on-line monitor method are adopted. The organic combination of these functional characteristics can realize failure current limitator thyristor valve trigger and on-line monitoring perfectly with reliable operation, high stability and strong anti-interference capability.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a thyristor electronic board for a fault current limiter. Background technique [0002] With the development of power electronic devices and the maturity of optoelectronic technology, the thyristor valve trigger and online monitoring system has also experienced tremendous development. Early thyristor valve triggering and monitoring were almost electromagnetic. That is, the ground potential device directly applies the trigger signal to the gate of the thyristor through the pulse transformer to trigger the thyristor. The electrical isolation device between ground potential equipment and high potential equipment is a pulse transformer. [0003] Since this method uses a pulse transformer to achieve high and low potential isolation and signal transmission, it has the following inevitable disadvantages: (1) The leakage inductance in the pulse transformer circuit will greatly reduce the s...

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Problems solved by technology

[0003] Since this method uses a pulse transformer to achieve high and low potential isolation and signal transmission, it has the following inevitable disadvantages: (1) The leakage inductance in the pulse transformer circuit will greatly reduce the steepness of the rising edge of the trigger pulse, especially When the voltage level is high, in order to ensure that the pulse transformer has sufficient insulation capacity, the leakage reactance of the primary and secondary sides will greatly increase, which will further cause the steepness of the leading edge of the trigger pulse to decrease, which is extremely important for the simultaneous triggering of the thyristor strings in the high-voltage valve. Adverse

(2) The distributed capacitance of the primary and secondary sides of the pulse transformer forms a high-frequency interference channel. When the valve is commutated or lightning strikes, it is easy to cause false triggering, so its anti-interference ability is poor

(3) When the voltage level is very high, it is difficult for the electromagnetic trigger method to accurately transmit the monitoring signal to the low potential, so it is difficult to realize the on-line monitoring of the thyristor

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