Current measuring device for circuit breaker, maintenance and calibration method thereof, and intelligent circuit breaker

Abstract

The invention discloses a current measuring device for a circuit breaker, which comprises an intelligent controller and a current transformer connected thereto. The memory of the intelligent controller stores the current correction coefficient of the current measuring device; the memory of the intelligent controller The measurement error of the current transformer is also stored in . The invention also discloses a maintenance and correction method of the current measuring device for the circuit breaker and an intelligent circuit breaker. By adopting the technical solution of the present invention, when an intelligent controller failure or a current transformer failure occurs in an already used intelligent circuit breaker, the service personnel only need to replace the intelligent controller or current transformer accordingly, and through a simple maintenance and correction method, the on-site Correction of current measurement accuracy effectively reduces service costs.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a current measuring device for a circuit breaker. Background technique [0002] In the low-voltage power distribution system, the controller of the intelligent circuit breaker is based on the microcontroller, and realizes the protection, measurement and monitoring functions of the circuit breaker through signal sampling, data processing and fault diagnosis. With the development of smart grid and digital technology, smart circuit breakers are required to achieve energy efficiency management, and the requirements for the measurement accuracy of main electrical parameters such as current, power and electric energy are getting higher and higher. Usually, the method of current measurement for intelligent circuit breakers is to use current transformers (generally Rogowski coils, namely Rogowski coils) for current sampling, and then calculate current measurement values ​​through intelligent controll...

AI Technical Summary

Problems solved by technology

The new current transformer used for replacement has a certain measurement error, which cannot be corrected by itself, and cannot match the original intelligent controller of the circuit breaker, which reduces the accuracy of the current measurement of the whole machine and fails to meet the product standard requirements

[0005] 3. Both the intelligent controller and the current transformer are faulty

At present, when the intelligent controller or current transformer of the intelligent circuit breaker in use fails, if the service personnel only replace the faulty intelligent controller or faulty current transformer accordingly, it is not convenient for the field to accurately check the current due to the limited on-site inspection conditions. to correct

Therefore, in order to ensure that the whole circuit breaker can still meet the high-precision measurement requirements stipulated in product standards, service personnel generally can only replace the original intelligent controller and current transformer of the circuit breaker with a new matching intelligent controller. with current transformers, which substantially increases service costs

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