Insulation pre-inspection device for main wiring of low-voltage circuit breaker based on piezoelectric ceramic transformer

A technology of low-voltage circuit breakers and piezoelectric ceramics, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of staff injuries, no mention of the interference of distributed capacitance of three-phase wires, etc.
CN103901313BActive Publication Date: 2016-08-24HUAWEI TEHCHNOLOGIES CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
HUAWEI TEHCHNOLOGIES CO LTD
Publication Date
2016-08-24

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Abstract

The invention discloses a low-voltage circuit breaker main wiring insulation pre-checking device based on a piezoelectric ceramic transformer, and belongs to the technical field of low-voltage apparatuses. The device comprises a piezoelectric ceramic transformer high-voltage generating circuit, a piezoelectric ceramic transformer harmonic drive circuit, a piezoelectric ceramic transformer harmonic detection circuit, a short-circuit detection sensing circuit and a main measurement and control circuit. The piezoelectric ceramic transformer high-voltage generating circuit is connected with the piezoelectric ceramic transformer harmonic drive circuit, the piezoelectric ceramic transformer harmonic detection circuit and the short-circuit detection sensing circuit 4, the piezoelectric ceramic transformer harmonic drive circuit is connected with the short-circuit detection sensing circuit and the main measurement and control circuit, the main measurement and control circuit is connected with the piezoelectric ceramic transformer harmonic detection circuit and the short-circuit detection sensing circuit and transmits data to a user through a data output end, and the short-circuit detection sensing circuit is connected with a load side of a low-voltage circuit breaker QF of an access power grid. The device can detect low-resistance short-circuit failures and high-resistance short-circuit failures lower than the normal value but higher than the low resistance value.
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Description

technical field

[0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to a low-voltage circuit breaker main wiring insulation pre-inspection device based on a piezoelectric ceramic transformer. Background technique

[0002] After the traditional low-voltage circuit breaker is closed and running, it can automatically trip quickly to eliminate the fault when the power supply and distribution line is short-circuited. Before closing, the low-voltage circuit breaker does not have the function of judging the insulation status of the main wiring on the load side. In the actual application process of the power supply and distribution system, accidents often occur due to the closing of the low-voltage circuit breaker when the power supply and distribution line on the load side is in a short-circuit state. The development of economy and society has further improved people's requirements for the reliability of power supply a...

Claims

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