Abstract
The monitoring of current is great significance to evaluate the running state of electrical equipments. In this paper, a portable high-precision online current detection system is presented, and a current sensor is designed which can be opened-closed conveniently. The current sensors have the same frame structure and size, but the number of turns is different. Coils with fewer turns are used to measure the large current, and coils with more turns are used to measure the weak current. By the cooperation of two coils, the accurate measurement of current in a large dynamic range can be achieved and has the advantages of easy installation and small size. In order to improve the accuracy, an improved digital integration algorithm is proposed. The results show that the error of the system is not more than 0.7% when the current ranges from 0 to 1 A, and the error is not more than 0.21% when the current is between 1 and 100 A.
Published Version
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