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BackHome > Products > Power transformer

Power transformerSZ9 series oil-immersed power transformer of class 35kV with dual-winding on-load tap-changing

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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℃

額定容量	安裝尺寸（mm）
kVA	L	W	H	C1	C2
800	2740	970	2120	820	820
1000	3000	990	2170	820	820
1250	3070	1020	2190	820	820
1600	3150	1060	2250	820	820
2000	2700	1100	2300	1070	1070
2500	3120	2300	2365	1070	1070
3150	3220	2350	2410	1070	1070
4000	3300	2560	2490	1070	1070
5000	3350	2750	2550	1070	1070
6300	3580	2800	3080	1475	1475
8000	3790	2610	3210	1475	1475
10000	3870	3220	3400	1475	1475
12500	3990	3260	3540	1475	1475
16000	4370	3480	3680	1475	1475
20000	4850	3050	3970	1475	1475
25000	5470	4000	4010	1475	1475
31500	5900	4450	4100	1475	1475

SZ9-800 ~ 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	±3×2.5% ±4×2.5%	3.15 6.3 10.5 10.0 11.0	Yd11	1.35	10.40	1.3	6.5	1010	3360
1000					1.60	12.80	1.2		1080	3800
1250					1.90	15.50	1.1		1170	4250
1600					2.30	18.50	1.1		1400	5010
2000					2.88	20.25	0.8		1590	5820
2500					3.40	21.73	0.8		1700	6350
3150					4.04	36.01	0.75	7	1950	7950
4000					4.84	30.69	0.75		2165	9065
5000					5.80	36.00	0.68		2250	9810
6300					7.04	38.70	0.68	7.5	2610	12010
8000				YNd11	9.84	42.75	0.6		2890	14790
10000					11.60	50.58	0.6		3830	18750
12500					13.68	59.85	0.56	8	4270	23530
16000					16.46	74.02	0.54		6200	25600
20000					19.46	87.14	0.54		7500	32670
25000					23.70	107.00	0.5		7800	42020
31500					27.50	126.00	0.4		8960	44330

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.