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BackHome > Products > Distribution transformer

Distribution transformerS9 series oil-immersed distribution transformer of class 35kV with dual-winding off-circuit-tap-chan

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Specifications
Technical

It is applicable for power systems of AC50Hz and rated working voltage 35kV, used as transformation equipment for substations of 35kV.

Iron
The iron core is made of cold-rolled grain-oriented silicon steel sheets with high magnetic conductivity, with inclined joint laminated structure. Section of the core limbs is of multi-class ladder round, with uniform section with that of yoke.

Winding
The winding adopts corrugated oil duct with non-dipping process, bound by shrinkable tape; all windings are of concentric coils; taps of HV winding with corresponding tapping voltage shall be led to the tap switch, and the switch shall be installed on the box cover. Power supply must be cut off first when changing the tapping voltage.

Installation of protection device
●Transformers of all capacity specifications have been equipped with pressure relief valve;
●Gas relay with alarm and tripping terminals is available on request.

Oil-temperature measurement device
●All the transformers are equipped with tube holder for glass-stem thermometer that is set on the top of oil tank, and immersed in oil for about 120±10mm;
●1000~2000kVA transformer is equipped with outdoor signal thermometer;

Transformer oil tank
●Transformer oil tank is composed of corrugated walls with powder painted surface and reinforced with film. Corrugated cooling fin not only has cooling function, but also has “breathing” function, the elasticity of corrugated cooling fin make it adapt to the change of oil volume due to change of temperature. So this hermetically sealed transformer does not have oil conservator, which decreases the height of transformer.
●The transformer adopts vacuum oil-injection technology during encapsulation that thoroughly removes the moisture from transformer, and keeps the transformer oil from contacting the air. This technology also avoid insulation performance reduction or oil aging due to entering of oxygen or moisture, it improves operation reliability of transformer.

● Installation height: altitude shall not exceed 1000m
● Ambient temperature: -40℃~40℃

Rated capacity	Installation dimension（mm）
kVA	L	W	H	C1	C2
50	1140	915	1430	550	550
100	1140	1040	1550	550	550
125	1140	1040	1580	550	550
160	1660	880	1620	660	660
200	1660	890	1650	660	660
250	1660	900	1690	660	660
315	1745	920	1760	660	660
400	1785	1000	1810	660	660
500	1815	1100	1850	820	820
630	1830	1115	1920	820	820
800	1905	1230	1960	820	820
1000	2260	1250	2135	820	820
1250	2415	1320	2165	820	820
1600	2505	1450	2235	820	820

S9-50 ~ 1600/35 transformers

Rated capacity	Voltage combination			Connection group	Loss (KW)		No-load current	Short-circuit impedance	Weight (kg)
kVA	HV kV	High-voltage tapping range	LV kV	symbol	No-load	On-load	%	%	Oil weight	Gross weight
50	35 38.5	±5% ±2×2.5%	0.4	Dyn11 Yyn0	0.21	1.27/1.21	2	6.5	220	610
100					0.29	2.12/2.02	1.8		250	810
125					0.34	2.50/2.38	1.7		255	885
160					0.36	2.97/2.83	1.6		305	1040
200					0.43	3.50/3.33	1.5		403	1400
250					0.51	4.16/3.96	1.4		412	1450
315					0.61	5.01/4.77	1.4		430	1600
400					0.73	6.05/5.76	1.3		460	1700
500					0.86	7.28/6.93	1.2		525	2025
630					1.04	8.28	1.1		580	2315
800					1.23	9.9	1		645	2715
1000					1.44	12.15	1		745	3315
1250					1.76	14.67	0.9		825	3730
1600					2.10	17.55	0.8		955	4420

Note: load loss values above the oblique line in the table are suitable for products of connection group Yd11, and values below are suitable for products of connection group YNd11.

Order guide

Please specify the product model, rated capacity, HV/LV rated voltage and high-voltage tapping range, phase number, frequency, connection group symbol and so on in the order.