Along with uprating the voltage class of the switchgear the electromagnetic compatibility (EMC) between the high-voltage components and the low-voltage smart devices becomes increasingly prominent, and the breaking of the circuit breaker inside the medium-voltage switch cabinet is regarded as the source of the most severe electromagnetic interference, therefore it is significant to research the electromagnetic interference on secondary smart devices caused by breaking the switchgear.

DURING THE CONSTRUCTION OF THE FIRST 500 KV AC DOUBLE-CIRCUIT TRANSMISSION LINE ON THE SAME TOWER LOCATED AT 20 MM HEAVY ICING AREA IN CHINA, THE DYNAMIC RESPONSE OF THE TRANSMISSION LINES UNDER VARIOUS ICE-SHEDDING CASES ARE ANALYZED BY NUMERICAL SIMULATION, THE ENGINEERING FORMULA FOR CALCULATING ICE-SHEDDING JUMP HEIGHT AND SWING DISTANCE ARE OBTAINED, AND ALSO VARIATION OF DYNAMIC LOAD ON THE TOWER.

In 2018, the tenth substation equipment bidding of the State Grid Corporation’s power transmission and transformation project mainly includes 13 types of equipment such as: transformers, combined electrical appliances, disconnectors, circuit breakers, switchgear, transformers, arc suppression coils, reactors, capacitors, arresters, cables, protection equipment, substation monitoring, etc.

In 2018, the tenth substation equipment bidding of the State Grid Corporation's power transmission and transformation project mainly includes transformers, combined electrical appliances, isolating switches, circuit breakers, switchgear, transformers, arc suppression coils, reactors, capacitors, lightning arresters, cables, and protection. 13 types of equipment such as class equipment and substation monitoring.

In 2018, the sixth substation equipment bidding of the State Grid Corporation's power transmission and transformation project mainly includes transformers, combined electrical appliances, isolating switches, circuit breakers, switchgear, transformers, arc suppression coils, reactors, capacitors, lightning arresters, power cables, 13 types of equipment such as protection equipment and substation monitoring.

Reporter: In recent years, State Grid Co., Ltd. has made great efforts to promote the construction of “world-class distribution network” with remarkable results. Please tell us about the company's current work in the construction of distribution network? How is the specific effect?

In our lives, we are always inseparable from electricity. Ice is one of the most serious threats to the current power grid. With the start of the “freezing” model this winter, temperatures in the southern regions of Guangdong, Guangxi, and Guizhou have continued to decline, and some alpine regions are snow-capped. To protect the security of electricity supply, China Southern Power Grid launched the first round of this year's melting ice.