Affiliation:
1. Electric Power Research Institute of Guangdong Power Grid Corporation
2. Guangdong Institute of Automation
Abstract
In the process of detecting and calibrating for power equipments, it appears a phenomenon that standard equipment is damaged by harmful random large current from tested equipment. This danger signal mainly occurs in the transient state of tested equipment, i.e., in a short time after starting to output new set current. This paper proposes a method for protecting standard equipment to eliminate damage caused by random large current. Its content mainly describes one of the key parts of this scheme including accurately sampling and transient signal removing intelligently in details. Design the related current sampling circuit, test results show that the resolution of circuit can reach to 10mA, which satisfies the work well.
Publisher
Trans Tech Publications, Ltd.
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