Method and device for controlling at least one circuit breaker of a power system
AssigneeABB Power Grids Switzerland AG
InventorsMichael Stanek, Soumya Kanta
Life of this patent
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Abstract
A power system comprises a power source, a transmission line coupled to the power source through a circuit breaker, a shunt reactor coupled to the transmission line, and a current transformer connected in series with the shunt reactor. A method for controlling the circuit breaker of the power system comprises processing an output signal of the current transformer to obtain the voltage on the transmission line by determining a time derivative of a current sensed by the current transformer. The method further comprises performing, by at least one control or protection device, a control or protection operation (e.g., auto-reclosing) based on the determined time derivative of the current sensed by the current transformer.
Claims17
A method of controlling at least one circuit breaker of a power system, the power system further comprising a power source, a transmission line coupled to the power source through the circuit breaker, a shunt reactor coupled to the transmission line, and a current transformer connected in series with the shunt reactor, the method comprising:
- processing an output signal of the current transformer, comprising determining a time derivative of a current sensed by the current transformer;
- and
- performing a control and/or protection operation based on the determined time derivative of the current sensed by the current transformer.
A control or protection device for controlling at least one circuit breaker of a power system, the power system further comprising a power source, a transmission line coupled to the power source through the circuit breaker, a shunt reactor coupled to the transmission line, and a current transformer connected in series with the shunt reactor,
- wherein the control or protection device comprises:
- an input to receive an input signal representing a current sensed by the current transformer or a time derivative of the current sensed by the current transformer;
- and
- a control circuit adapted to perform a control and/or protection operation based on the time derivative of the current sensed by the current transformer.
Dependencies are inferred from the claim text.