De-excitation switch, Supercapacitor, Constant current control, Synchronous recording, Multi-functional testing platform Abstract: Generator de-excitation switches are crucial devices for generator protection. Proper maintenance and testing are essential to ensure their optimal working condition. This study focuses on the CEX series deexcitation switches from LENOIR, France, and develops a multi-functional testing platform capable of measuring contact resistance, testing switch opening and closing, and evaluating synchronous performance. The platform utilizes coordinated control of supercapacitors and loop current control load components to generate a high-quality 1500A constant current as the measuring power supply. This significantly reduces the volume of the high-current generation device and improves power density. A shunt and multi-channel synchronous recording module record the action st Generator de-excitation switches are crucial devices for generator protection. Proper maintenance and testing are essential to ensure their optimal working condition. This study focuses on the CEX series de-excitation switches from LENOIR, France, and develops a multifunctional testing platform capable of measuring contact resistance, testing switch opening and closing, and evaluating synchronous performance. The platform utilizes coordinated control of supercapacitors and loop current control load components to generate a high-quality 1500A constant current as the measuring power supply. This significantly reduces the volume of the high-current generation device and improves power density. A shunt and multi-channel synchronous recording module record the action status and time of each switch contact, with a recording accuracy of 0.2ms+0.1%FS, enabling multi-functional testing of the deexcitation switch.atus and time of each switch contact, with a recording https://mc.manuscriptcentral.com/jcmse Journal of Computational Methods in Science and Engineering For Peer Review accuracy of 0.2ms+0.1%FS, enabling multi-functional testing of the deexcitation switch. Page 1 of 8 https://mc.manuscriptcentral.com/jcmse Journal of Computational Methods in Science and Engineering 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 For Peer Review Development of a Multi-functional Testing Platform for Generator Deexcitation Switches Jingguang Yang1, Shaoxin Liu1, Jiazhi Zhang1, Jinsong Gao1, Xiaoyong Lv1, Ju Zhao1, Shusheng Lin2, Ruiyu Zeng3, Huan Guo3 (1. China Yangtze Power Co., Ltd., Yichang, Hubei 443000; 2. eTocsin Inc., Zhuhai, Guangdong 519000; 3. Jinan University, Zhuhai, Guangdong, 519070) Abstract: Generator de-excitation switches are crucial devices for generator protection. Proper maintenance and testing are essential to ensure their optimal working condition. This study focuses on the CEX series de-excitation switches from LENOIR, France, and develops a multi-functional testing platform capable of measuring contact resistance, testing switch opening and closing, and evaluating synchronous performance. The platform utilizes coordinated control of supercapacitors and loop current control load components to generate a high-quality 1500A constant current as the measuring power supply. This significantly reduces the volume of the high-current generation device and improves power density. A shunt and multi-channel synchronous recording module record the action status and time of each switch contact, with a recording accuracy of 0.2ms+0.1%FS, enabling multi-functional testing of the de-excitation switch. Keywords: De-excitation switch; Supercapacitor; Constant current control; Synchronous recording; Multifunctional testing platform. Chinese Library Classification Number: TM Document Code: A 0