Circuit breaker electronic trip unit without special transformer for ground current sampling
A technology of electronic release and current transformer, which is applied in the direction of protection switch operation/release mechanism, etc., which can solve the problems of affecting the installation method, increasing the cost of circuit breakers, and increasing the volume of complete cabinets
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[0008] In order to further understand the content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:
[0009] Such as figure 1 As shown, the primary sides of the three-phase air-core current transformers CT1, CT2, and CT3 are respectively connected to the three-phase main circuit conductors of the circuit breaker, and the output end of the secondary side of the air-core current transformer CT1 is connected to the capacitor C1, one end of the resistor R1 and One end of the same-phase end of the integrated circuit U1 is connected to the current sampling and processing circuit of the phase line of the original electronic circuit breaker electronic trip unit; the inverting input end of the integrated circuit U1 is connected to the output end, and is connected to one end of the resistor R6; the hollow current One end of the output end of the secondary side o...
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