35kv high-voltage power capacitor

Abstract

The invention relates to a power capacitor in a 500kV substation reactive power compensation system, and specifically relates to a 35kV high-voltage power capacitor unit. The 35kV high-voltage power capacitor unit comprises an aluminum foil upper electrode plate and an aluminum foil lower electrode plate, and a plurality of flush insulation films are arranged between the aluminum foil upper electrode plate and the aluminum foil lower electrode plate. The aluminum foil upper electrode plate is arranged to the left and staggered from the insulation films, and is folded upward at the right end. The aluminum foil lower electrode plate is arranged to the right and staggered from the insulation films, and is folded upward at the left end. The strength of the maximum electric field acting on the electrodes and the polypropylene films is reduced effectively, and partial discharge of the capacitor unit is inhibited.

Description

technical field [0001] The invention relates to a power capacitor in a reactive power compensation system of a 500kV substation, in particular to a 35kV high-voltage power capacitor. Background technique [0002] The 35kV parallel power capacitor is an important device in the reactive power compensation system used in the 500kV substation; since the switching and switching operations of the reactive power compensation devices in the 35kV system are relatively frequent, the parallel power capacitor in the 500kV substation often suffers from operating overvoltage. It leads to frequent failure of capacitors. Among all the failures of capacitors, bulges account for the largest proportion. Generally, it is normal for the fuel tank to expand and contract with temperature changes. However, when partial discharge occurs inside, the insulating oil produces a large amount of gas, which will cause The box wall is deformed, forming an obvious bulging phenomenon. The bulging capacitor ca...

AI Technical Summary

Problems solved by technology

In addition, the operating overvoltage caused by excessive operating voltage or switch restart will also generate partial discharge

[0004] Traditional non-folding hidden foil aluminum foil electrodes, due to poor contact between the lead sheet and the aluminum foil electrode, and the concentration of the electric field at the lead sheet and the edge of the electrode, partial discharge is prone to occur at the lead sheet and the electrode edge area; the existing capacitor When the capacitor unit used is subjected to overvoltage, the electric field intensity distribution of the capacitor unit is uneven, and partial discharge is prone to occur

Long-term operation will lead to capacitor failure, which directly affects the effective operation of the reactive power compensation system

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