A high voltage DC gas circuit breaker with wide current range

Abstract

A high-voltage DC gas breaker with a wide current range includes a high-voltage DC breaker, a superconducting current limiter in series connection with the high-voltage DC breaker, and a magnetic field applying device placed near superconducting tapes in the superconducting current limiter. The magnetic field applying device and the superconducting tapes are placed at any angle; after the superconducting tapes are applied with a magnetic field by the magnetic field applying device near the superconducting tapes in the superconducting current limiter, a critical current value of the superconducting tapes decreases, so that an original current which cannot be limited can be limited; and then the high-voltage DC breaker cuts off an already-limited smaller current value. Therefore, the breaker of the invention can simultaneously cut off the fault current and the rated current, and the high-voltage DC breaker function and the breaking current range are effectively improved.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to a superconducting current-limiting high-voltage direct current circuit breaker with an external magnetic field. Background technique [0002] At present, the principles of the commonly used high-voltage DC circuit breakers are self-excited oscillation type, which excites the oscillation type and uses the current limiting device to limit the current first and then break the type. The use of current limiting devices to limit current first and then break is a hot research direction today, which is also inseparable from the rapid development of current limiting technology. There are two main reasons why current limiting technology has attracted attention: First, as the capacity of the power grid continues to increase, the level of short-circuit current also increases. Limiting short-circuit current can improve the safety and stability of the power system, the quality of powe...

AI Technical Summary

Problems solved by technology

There are two main reasons why current limiting technology has attracted attention: First, as the capacity of the power grid continues to increase, the level of short-circuit current also increases. Limiting short-circuit current can improve the safety and stability of the power system, the quality of power supply of the power grid, and the operation of the power grid. Flexibility; second, the existing power devices have low overload capacity, and the di / dt and du / dt that can be tolerated are limited. In order to prevent breakdown or damage to power devices when a fault occurs, a current limiter is required

The DC transfer switch currently used in the DC transmission system can only break the rated current, while the high-voltage DC circuit breaker based on superconducting current limiter technology can only break the fault current

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