Study In Design And Count On Making Up Type Mutual Inductor

Among our country project of transmitting and converting electricity, mutual inductor guarantee power system safe, reliable and economical operation essential equipment. Fail and turn electric wire into of the distance in 110kV and above voltage high pressure and vltrahigh voltage of grade, The mutual inductor generally adopts the mutual inductor of electric current( CT) and voltage mutual inductor( CVT). The mutual inductor of electric current and voltage mutual inductor play an important role in relay protection.Prevent from CT differential to protect and miss movement an important subject that the generatrix is protected on the saturation, Put forward two electric current pass zero hour linear to spread person who become put into differential to protect in CT in recent years, Avoid CT saturation district, can judge the bus bar trouble correctly . But because CT at the time of the saturations have the complicated in wave form electric current,how correct to judge the saturations constantly, determine CT their the linear to spread becoming area protection of difficult point it be. And to the electric capacity type voltage mutual inductor, because it compares with electromagnetic type voltage mutual inductor, Transient state its bad to respond characteristic, as circuit when making the short circuit two times trouble, The voltage two times delays dropping to zero while needing to pass certain one. And modern movement of relay protection time more and more little, smaller than 20 ms generally, accurate working voltage of movement its low to 1-3 Vs. Existing research indicate , cause CVT bad main reason that transient state respond energy storage of damper unit their very ideal. So choose parameter of damping device with reduce energy storage to improve CVT become and respond effective way of characteristic wink rational, This increases the capacity of sending for raising the dynamic stability of the supervoltage power transmission and transformation system, Guarantee power system safe and reliable to run and have important technology economic meanings. For meet the needs of modern relay protection, these had the above, must study in carrying on design of mutual inductor. Subject this because of the situation, and market demand put forward from produce real. Thesis this in existing electric capacity, Whether it utilize by the CT one mainly reject and mix by suitable partial pressure not low-voltage partial pressure arm not high-handed of CVT electric capacity not insulating, in the middle of and can't compensate reactor,etc. of voltage transformer , Design by sectional mutual inductor that CT combine CVT with, sectional mutual inductance utensil this have electric current mutual inductor and voltage double function of mutual inductor. Adopt some new material, new technology in design of mutual inductor , apply to mutual inductor to technology of relay protection study.