220 kV oil-immersed transformers

Detailed Product Description
1. The electromagnetic calculations and design of 220kV series oil-immersed power transformer adopts the most advanced design software, SolidWorks three-dimensional software is used for computer aided design, which guarantees all performance indexes are superior to that stipulated in Chinese National Standards.
2. COMOS software is adopted for the strength analysis of transformer tank and constructional part of cores. By applying leakage magnetic field analyzing software, leakage magnetic distribution and its electro-dynamic force sustained can be precisely analyzed; Feasible schemes of structure design are selected after thorough theoretic and test research to the issues such as electric, magnetic, thermal, mechanical strength and short-circuit strength of those large capacitance transformers.
3. Power frequency electrical field calculating software and lightning over-voltage winding potential distribution calculating software are adopted for the calculating of gradient distribution of main insulation, longitudinal insulation and impulse voltage in the windings as well as that of winding terminals, hence guarantee the reliable electrical insulation of transformers.
4. High-quality imported silicon steels are adopted for all cores, with a structure of three phase five limb drawing plate. Laminations are in the form of five-step of laminated, fully mitered, with the technique of none-pile on upper yoke. These measures effectively upgrade transformerâ??s no-load performance. Meanwhile, appropriate magnetic flux density and the auto-oscillation frequency of cores are selected for lowering transformerâ??s sound level.
5. By way of leakage magnetic field analysis and the compound blocking technique used in transformer tank combining magnetic blocking and copper blocking methods, measures to reduce transformerâ??s stray losses, such as lowering eddy current losses, drawing plates of core, minimizing slots, etc, according to different locations of core structural parts in the leakage magnetic field; To effectively reduce load losses, winding transposing is optimized and eddy current losses are lowered as well.
6. By calculating of oil flow distribution, scientific oil flow distribution in transformer body is adopted. A zigzag oil conduit structure is adopted, so that the average temperature rise and the hot-spot temperature rise of the winding can be lowered, thereby prolong transformerâ??s service life.
7. Out-leading of HV has a simple structure. The insulation at the equalization valve of bushings can be easily installed through the inspection hole on the ascending flanged base wall. To relief the installation work at site and to make sure the work more effective, untanking of transformer core is neednâ??t during transformer installation at site. All active parts have been pre-assembled at works.