Take regular inspections and replace some seals regularly

The 3kV wall bushing wall outside the high-voltage switch room of the Yangbajing branch plant to the 35kV booster station has been loosened due to the loosening of the pouring hardware, and the busbar and the pile head nut are loose, the contact resistance is increased, causing severe burns. , causing blackouts. There are explosion accidents in outdoor 3kV and 10kV cable heads. The arresters are also caused by air leakage and moisture due to insulation and sealing aging, and then single-phase grounding accidents caused by breakdown; even two-phase grounding short-circuit accidents. In this case, only regular inspections and regular replacement of some seals can be taken.

Harmful gases in the air corrode electrical equipment The Yangbajing geothermal power station directly uses underground hot water to generate electricity. The installed capacity is 25.18 MW. The amount of hot water discharged per hour is considerable, reaching about 2000 m3. Since hot water contains a large amount of non-condensable gases such as carbon dioxide and hydrogen sulfide, most of these harmful gases diffuse into the air during the hot water discharge process, causing different degrees of corrosion to electrical equipment, and some are even severe.

The imported valves of the I and II expansion vessels of the thermal system were originally made of electric valves; the use was normal, the control was flexible and reliable; but over time, the control gradually failed, and most of the inspections were caused by corrosion of the contacts. Once the motor fails, manual operation of the valve is very slow and laborious, forcing the electric valve to be gradually changed to a manual valve. Some switches and control handles, in addition to the impact of air pressure during the arc extinguishing process, harmful gas corrosion is a non-negligible aspect (including battery pack contacts).