220KV Power Transformer

Load-ratio voltage regulation, high reliability, advanced level of performances, reasonable economical indicators. The core joints are of stepped shape with 3 steps, and the surface of the core is coated with cured paint to lower losses and noise. Please contact us! Email:

liujing@mec.com.cn

Product Details Company Profile

Description

Skype:liujingmec liujing@mec.com.cn Coil 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. 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． The winding adopts radial”0”margin design, 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.									Core 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 burrs controlled within 0.02mm. 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 noise. 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 iron yoke and the lower section of oil tank is tightened with counter-pressure bolts. The upper iron yoke and the upper section of oil tank are fixed at 3 locations. Hence the body inside the oil tank can withstand the vibration during transportation without any shift.

	Rated Power (kVA)	High Voltage (kVA)		H.V.Tap Range	Low Voltage (kVA)	Connection Symbol		Short-Circuit Impedance (%)		No-Load Loss (kW)			On-Load Loss (kW)			No-Load Current (%)
										Series9	Series10	Series11	Series9	Series10	Series11	No-Load Current (%)
	31500	220 242	±8×1.25% ± 8×1.5%		6.3, 6.6 10.5, 11 20, 34.5 35, 37 38.5, 66 69		YNd11	12~14		38	34	30	135	128	128	0.7
	40000									45	41	36	157	149	149	0.63
	50000									54	49	43	189	180	180	0.56
	63000									63	57	50	220	209	209	0.56
	90000									80	72	64	288	274	274	0.49
	120000									99	89	79	346	329	329	0.49
	150000									116	104	93	405	385	385	0.42
	180000									135	122	108	468	445	445	0.42

Main Technical Parameters for three-phase

two winding on-load-tap-changing Power transformer

Oil tank and accessories

The tank wall adopts wide steel sheet，which will be folded into corrugated structure without splicing, in this way welds are decreased mechanical strength is enhanced; meanwhile, the corrugated wall has diverging effect, and thus plays a role in decrease of noise. The routing troughs and control cabinets of the secondary circuit are all made of stainless steel, so the entire transformer has a simple and good looking. All sealing surfaces use quality sealing material and are precision-machined. On the edge of the tank there are double sealing grooves, and the outer sealing material is used to shade the atmosphere and ultra-ray to protect the inner sealing being damaged, thus at utmost prolonging service life and enhancing reliability of the seal.