A Ping-Pong Self-detection based Online No-dead-time Detection Method for the Tripping-and-closing Circuit

摘要

Currently, the detection of the process layer equipment and circuits between breakers is mainly realized through the control circuit. However, the control circuit cannot detect the status of the tripping-and-closing contacts and straps, leading to the failure of the operation of the process layer equipment. To solve this problem, this paper proposes a ping-pong self-detection based online no-dead-time detection method for the tripping-and-closing circuit. Firstly, the topology structure of the existing tripping-and-closing circuit of protections is improved. A contact of the tripping-and-closing relays and the corresponding optocoupler circuit are added. Then, based on the improved control circuit, the self-detection is completed according to the optocoupler acquisition status by sequentially opening and closing the contact of the tripping-and-closing relays with no need of forming a tripping and closing circuit. The proposed method can improve the reliability of the control circuit, avoiding the failure of the operation of the equipment. The test and on-site pilot validate the effectiveness of the proposed detection method.