Abnormal current detecting circuit for circuit breaker
A technology for abnormal current and circuit detection, applied in circuit breaker testing, measuring current/voltage, circuit devices, etc., to solve problems such as changes in integrated circuits, failure to provide reliable detection of abnormal current, and failure to ensure reliable operation of circuit breakers
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[0025] Objects of the present invention, configurations and operations for accomplishing the above objects will be clearly understood through the following description of preferred embodiments of the present invention with reference to the accompanying drawings.
[0026] First, combine figure 1 An overall circuit diagram showing an abnormal current detection circuit for a circuit breaker according to the present invention and a power circuit mounted with a circuit breaker including the abnormal current detection circuit is described.
[0027] The entire power circuit installed with a circuit breaker can be configured to include an alternating current (AC) current source 100, a zero-phase converter (hereinafter abbreviated as ZCT) 102, a filter circuit 103, a resistor 101 for voltage formation, a direct current (DC) Convert the power supply circuit section 104, the abnormal current detection circuit 200, the solid-state switch (so-called semiconductor switch) SCR, the trip coil...
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