Tag: capacitors

The performance, shelf life, and service life of all capacitors depends largely on the environmental conditions in which they are exposed. Not only must the relationship of a single environmental factor to the capacitor, but also the effect of different combinations of these environmental factors be considered. The main environmental factors that affect the performance and life of capacitors are ambient temperature, humidity, vibration, shock, acceleration and atmospheric pressure, etc. The impact of these single environmental factors is briefly discussed as follows.

For wirings of three phase shunt capacitors or three phase capacitor banks composed of three single phase shunt capacitors, the most commonly used are star and triangle wirings. Star wiring includes single star wiring and double star wiring while triangle wiring includes single triangle wiring and double triangle wiring. The double triangle wiring is gradually eliminated due to complicated wiring and high cost. Low voltage shunt capacitors mostly use triangular wiring and high voltage shunt capacitors, especially for high voltage shunt capacitors with large capacity, mostly use star wiring.

Self-healing type low voltage shunt capacitor is suitable for the AC power system with working frequency 50Hz or 60Hz, rated voltage 1000V and below and is connected in parallel with load, in order to improve the power factor of system and reduce line loss, improving the voltage quality. It is widely used to improve the efficiency of power supply equipment, local compensation of the inductive equipment such as motor and transformer and electric furnace, electric traction engine, UPS systems and power system harmonic filtration and other aspects.