External circuit breaker of prepaied electric energy meter

Abstract

The invention discloses an external circuit breaker of a prepaied electric energy meter. The external circuit breaker comprises a miniature circuit breaker, a power supply circuit, a power-on time-delay circuit, a rapid opening and closing time-delay capacitor rapid discharge circuit, an opening and closing feedback circuit, a control signal receiving circuit, a control signal indication circuit,an opening time-delay circuit, an opening and tripping drive circuit, a tripping coil inching drive circuit, a circuit for conducting locking in case of tripping of a tripper three times, and an opening fault tripper coil protection circuit, wherein the miniature circuit breaker is connected with the power supply circuit; the power supply circuit is respectively connected with the power-on time-delay circuit and the rapid opening and closing time-delay capacitor rapid discharge circuit, and the rapid opening and closing time-delay capacitor rapid discharge circuit is also connected with the power-on time-delay circuit. The external circuit breaker of the prepaied electric energy meter has the advantages that misoperation can be prevented, power consumption can meet standard requirements, apower source can be subjected to standard EMC design, power consumption of an opening device is prevented, and the tripper of the circuit breaker is prevented from being burnt out.

Description

technical field [0001] The invention relates to the field of circuit breakers, in particular to an external circuit breaker for a prepaid electric energy meter. Background technique [0002] The electric energy meter (prepaid) external circuit breaker is a switch device used to cooperate with the electric energy meter and send a control signal through the master station or other systems to perform remote opening operation. It not only guarantees the function of the original circuit breaker, but also adds special control logic for prepayment. The State Grid has relevant technical specifications for the classification, control method and characteristic requirements, type structure, technical requirements, test methods, packaging, transportation, and storage of the external circuit breakers selected for electric energy meters. Standards for the acceptance, inspection and full performance test of the device. [0003] According to relevant standards, in addition to the basic re...

AI Technical Summary

Problems solved by technology

Such a control circuit is generally prone to the following failures: 1. Because of the moment of power-on, the startup of the switching power supply, and the delay in the initialization of the single-chip microcomputer, resulting in misoperation; 2. Using a switching power supply, the power consumption often does not meet the standard. Requirements; 3. Due to the limitation of the space of the circuit breaker, it is impossible to design a standardized EMC for the power supply; 4. The switching power supply takes power from the incoming line of the circuit breaker, and the circuit breaker still has power consumption during the opening period; 5. For the circuit breaker The working conditions are not well understood, often because when the circuit breaker is mechanically stuck, because the thyristor is always on after being triggered, the circuit breaker release will burn out

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