On October 31, the seminar on the cooperation between the switch-on of the main pump and the flow-protection time of the Gean direct-flow internal cooling water was held in Shanghai Superhigh-pressure Administration. State Grid Operation Co., Ltd., China Electric Power Research Institute, Xi'an Xi'dian Power Rectifier Co., Ltd., East China Electric Power Research Institute, NARI insurance companies, Xu Ji flexible transmission companies and other related experts and Yichang and Shanghai EHV Management Office of the relevant personnel attended the seminar. During the investigation of the hidden dangers of single-pole and single-pole DC blocking in the State Grid, Shanghai Superhighway was found to be unreasonable with the setting of the partial value of the main-flow-rate protection time in the switching logic of the main circulating pump of cold water in the Nanqiao Converter Station, Pump periodic switching and manual switching unsuccessful DC operation under the special operating conditions there is a risk of error locking (Ge South water cooling system in the main pump regular switching process, such as switching unsuccessful will be cut back to the original main pump 5 seconds, the main Water flow protection After detecting that the main water flow is less than 60% of the rated main water flow, the delay of 2.56 seconds causes the DC system to be blocked. At the meeting, Xixian Power Rectifier Co., Ltd. reported the calculation of the junction temperature of the commutation valve. The attendees discussed the cooperation between the switching of the main pump and the time of the traffic protection in the internal cooling water system of the Gean DC. After discussion, the conference decided to increase the protection delay of the main flow of Gelan DC internal water to 6.56 seconds. Through this measure, it will avoid the huge risk caused by unreasonable setting of partial value of the main circulating pump in the switching logic of the internal cooling water and unreasonable value of the main water flow, and improve the reliability of the safe and stable operation of the Gean HVDC transmission system.
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