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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
800	2140	1320	2120	820	820
1000	2400	1330	2170	820	820
1250	2470	1350	2190	820	820
1600	2550	1375	2250	820	820
2000	2700	1400	2300	1070	1070
2500	2520	2300	2365	1070	1070
3150	2600	2350	2410	1070	1070
4000	2680	2560	2490	1070	1070
5000	2730	2750	2550	1070	1070
6300	2960	2800	3080	1475	1475
8000	3170	2610	3210	1475	1475
10000	3250	3220	3400	1475	1475
12500	3370	3260	3540	1475	1475
16000	3470	3280	3580	1475	1475
20000	3950	3450	3850	1475	1475
25000	4570	3800	3900	1475	1475
31500	5000	4150	4000	1475	1475

S9-800 ~ 31500/35 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
800	35 38.5	±5% ±2×2.5%	3.15 6.3 10.5	Yd11	1.23	9.90	1.0	6.5	790	3040
1000					1.44	12.15	1.0		850	3410
1250					1.76	14.67	0.9		950	3890
1600					2.12	17.55	0.8		1060	4620
2000					2.72	19.35	0.7		1195	5345
2500					3.20	20.70	0.6		1285	5960
3150					3.80	24.30	0.56	7	1470	6695
4000					4.52	28.80	0.56		1760	8350
5000					5.40	33.03	0.48		1850	9400
6300					6.56	36.90	0.48	7.5	2200	11300
8000				YNd11	9.00	40.50	0.42		2450	13240
10000					10.88	47.70	0.42		3230	16600
12500					12.60	56.70	0.40	8	3585	19400
16000					15.20	69.30	0.40		4420	23100
20000					18.00	83.70	0.40		6060	29700
25000					21.28	99.00	0.32		6490	38200
31500					25.28	118.80	0.32		6890	40300

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.