Quick Details
Place of Origin: Zhejiang, China (Mainland)
Brand Name: EACHER
Model Number: SFZ11-50000/138
Usage: Power
Phase: Three
Coil Structure: Toroidal
Coil Number: Three-phase Two-winding
Packaging & Delivery
Packaging Details: Export worthy packing
Delivery Detail: 2~5 Months
Specifications
138kV/50000 kva Step up transf.
1) CTQC, ISO9001, ISO14001, CE
2) Apply for IEC, GB, ANSI
3) Up to 230kV, 180MVA
4) Low losses
Features:
1) Amount of local discharged: The apparent discharge amount is less than 80pC under 1.5 times of rated voltage;
2) Noise: Products of 63MVA and below is lower than 58 dB (AN);
3) Power loss: No-load loss is 30% lower than that of IEC standard;
4) Reliability: All in-service products have no damages or oil leakage occurred;

Application:
60 ~220 kV power system of power plant, substation, mining enterprise and etc.

Technologies:
Design: Relative developed software are adopted in Electromagnetic calculations, strength analysis, leakage magnetic distribution, its electro-dynamic force and electrical insulation.

Manufacture:
Core: Effectively upgrade transformer's no-load performance by below methods:
1) The core is made of high-permeable grain-orientated top quality cold-rolled silicon sheet and the material is cut with advanced Germany Geoge GmbH automatic shear line with the cut burs controlled within 0.02mm.
2) The silicon sheet fabrication adopts "no-upper yoke lapped' technology and all lapped joints of the silicon sheet are 45 full-miters. The laminated core sheets are integrally pressed and adhered with epoxy resin to make the three leg two-yoke core a strong and flat integral one with good verticality precision, this effectively improves no-load performance and reduces noises.
3) Bracing plates are used as support between coil leg and inner coil. The iron yoke is tied with epoxy resin-impregnated glass fiber band, and the lower section of oil tank is tightened with counter-pressure bolts.
Winding:
1) The high-voltage (HV) coil adopts an interleaved-continuous structure to improve the voltage characteristics under impact voltage and make voltage evenly distributed. All stays and pads are chamfered to keep highly reliable insulation.
2) In the transformer winding there is a zigzag oil guide structure so as to fully cool all areas inside the winding, lower the temperature rise of the winding and the hot points of the winding and prolong the service life of insulation. The HV and MV regulation system are independently provided with voltage-regulating winding to balance the ampere turn of each winding, effectively lower the axial electrodynamic force generated at short-circuit of transformer and improve abrupt short-circuit withstanding capacity.
3) The winding adopts radial "0" margin designed, between the core and the paper sleeve of LV winding, and between the LV, HV, voltage-regulating windings, as well as before insertion of stays and shroud plate they are fully dried and tightly matched to ensure extremely good compactness and concentricity of the entire winding.