Residual current operated circuit breaking device

Abstract

The application discloses a residual current operated circuit breaking device, comprising: a first zero sequence transformer which is arranged on a line to be detected and is used for outputting a first feedback signal when detecting a residual current through a first winding; a residual current detection circuit which is connected with the first zero sequence transformer and is used for making afirst end of a first switching circuit connected with a second end of the first switching circuit when receiving the first feedback signal; the first switching circuit of which the control end is connected with the residual current detection circuit; an electromagnetic tripper which is used for performing a switching-off action on the line to be detected after the first switching circuit is turnedon; a circuit breaker motherboard of which the input end is connected with the second end of the first switching circuit and which is used for making an electric switching-on / off operation mechanismperform a switching-off action on the line to be detected after the first switching circuit is turned on; and the electric switching-on / off operation mechanism which is connected with the circuit breaker motherboard. The scheme of the application improves the resistance to faults, and is beneficial to the completion of leakage protection by the circuit breaking device when leakage occurs to the line.

Description

technical field [0001] The invention relates to the technical field of circuit protection, in particular to a residual current operated circuit breaker. Background technique [0002] A residual current action protection switch is usually set in the line to realize the protection of the residual current, that is, the leakage protection. Specifically, when leakage occurs, the zero-sequence transformer will feed back a signal to the thyristor, so that the electromagnetic tripper performs a pull-in action, and the pull-in action drives the switch to trip and open. [0003] After the residual current action protection switch is installed, it is generally not disassembled for maintenance. If the electromagnetic tripper is damaged, the relevant circuit board is faulty, the relevant mechanical structure is stuck, etc. during operation, it will cause leakage. If the switch cannot be opened, it may cause harm to the user's personal property. Therefore, it is necessary to make the re...

AI Technical Summary

Problems solved by technology

However, due to the need for periodic fault testing, the user experience is reduced, and users may not perform periodic testing operations, further increasing the potential for faults

In addition, even if the user conducts the test periodically according to the requirements, there may be cases where the protection switch can still operate normally during a certain test, but the protection switch fails before the next test, and the circuit leaks again, making the protection The switch cannot realize leakage protection

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