Protection system, dc power system, and protection method
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsKazuki WATANABE, Kyoichi SAKO
Life of this patent
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Abstract
In a protection system configured to protect a semiconductor circuit breaker that cuts off a fault current flowing from a DC electric power system to equipment connected to the system, in an event of a system failure of the DC electric power system, the semiconductor circuit breaker includes a semiconductor switch element and a clamp circuit that absorbs overvoltage generated in the semiconductor switch element. The protection system includes a monitoring device that monitors an open/close state of a switch that switches connection to a power grid of the DC electric power system; and a circuit control unit that sets a circuit constant of the clamp circuit based on a monitoring result of the monitoring device.
Claims8
A protection system configured to protect a semiconductor circuit breaker that cuts off a fault current flowing from a DC electric power system to equipment connected to the system, in an event of a system failure of the DC electric power system, wherein the semiconductor circuit breaker includes a semiconductor switch element and a clamp circuit that absorbs overvoltage generated in the semiconductor switch element, the protection system comprising:
- a monitoring device that monitors an open/close state of a switch that switches connection to a power grid of the DC electric power system;
- and
- a circuit control unit that sets a circuit constant of the clamp circuit based on a monitoring result of the monitoring device.
A protection method for protecting a semiconductor circuit breaker that cuts off current flowing from a DC electric power system to equipment connected to the system, in an event of a system failure of the DC electric power system, wherein the semiconductor circuit breaker includes a semiconductor switch element and a clamp circuit that absorbs overvoltage generated in the semiconductor switch element, the protection method comprising:
- monitoring an open/close state of a switch that switches connection to a power grid of the DC electric power system;
- and
- setting a circuit constant of the clamp circuit based on a monitoring result.
Dependencies are inferred from the claim text.