Thyristor circuit and thyristor protection method
AssigneeABB Schweiz AG
InventorsRaeto Stadler, Ralf Baechle
Life of this patent
Estimating the term…
Abstract
A thyristor circuit includes at least one branch including at least one thyristor, a thyristor control circuit and a current detector. The current detector is configured to detect a current value representative of an electrical current flowing through the thyristor and to input the detected current value into the thyristor control circuit. The thyristor control circuit is configured to determine a fault condition in which the detected current value exceeds a predetermined current threshold based on a deteriorated blocking ability of the thyristor. Dependent on the determination result, the thyristor control circuit triggers the thyristor into a conductive state.
Claims20
A thyristor circuit, comprising:
- at least one branch comprising at least one thyristor;
- a thyristor control circuit for selectively triggering the thyristor;
- and
- a current detector configured to detect a current value representative of an electrical current flowing through the thyristor and to input the detected current value into the thyristor control circuit,
- wherein the thyristor control circuit is configured to determine a fault condition in which the detected current value exceeds a predetermined current threshold based on a deteriorated blocking ability of the thyristor, and, dependent on the determination result, to trigger the thyristor into a conductive state.
A thyristor protection method for protecting a thyristor in at least one branch of a thyristor circuit, the method comprising:
- detecting a current value representative of an electrical current flowing through the thyristor;
- determining whether the current value exceeds a predetermined current threshold based on a blocking ability dependent on a junction temperature of the thyristor;
- and
- dependent on the determination result, triggering the thyristor into a conductive state.
A method of protecting a thyristor in at least one branch of a thyristor circuit, the method comprising:
- detecting a current value representative of an electrical current flowing through the thyristor;
- determining, based on a deteriorated blocking ability of the thyristor, whether the detected current value exceeds a predetermined current threshold;
- and
- triggering the thyristor into a conductive state in response to determining that the detected current value exceeds the predetermined current threshold.
Dependencies are inferred from the claim text.