Description

S-35kV series oil immersed transformer produced by the company is suitable for three-phase AC 50 / 60Hz, rated voltage 35kV distribution grid, and plays an important role in high-voltage transmission and low-voltage power supply. Products with high efficiency, low loss characteristics, can save a lot of power consumption and operating costs, social benefits, have been widely used in power plants, substations, industrial and mining enterprises, ports, airports and other places. With on load tap changer, the product can realize the function of manual or automatic voltage regulation without power failure, which is conducive to stabilizing the voltage of power grid in each load center and improving the quality of power supply.

Model Meaning

Standards

IEC60076-1:2011 Power transformers - Part 1: General
IEC60076-2:2011 Power transformers - Part 2: Temperature rise for liquid-immersed transformers
IEC 60076-3:2013+AMD1:2018 Power transformers - Part 3: Insulation levels, dielectric tests and external clearances in air
IEC 60076-5:2006 Power transformers - Part 5: Ability to withstand short circuit
IEC 60076-10:2016 Power transformers - Part 10: Determination of sound levels

Normal Environment conditions

Ambient Temperature: No more than +40℃, No less than -25℃, The monthly average temperature is no more than +30℃., The yearly average temperature is no more than +20℃.
Altitude: No more than 1000m.
The power supply voltage's wave is similar to a sine wave.
Three-phase power supply voltage is approximately symmetrical.
The total harmonic content of load current shall not exceed 5% of rated current;
Installation Site: Indoor or outdoor.

Product characteristic

The core is made of cold-rolled silicon steel sheet with high magnetic conductivity and grain orientation, with low no-load loss.
The three-phase winding is concentric coil, corrugated oil duct, no paint dipping process and tight band binding are adopted. High mechanical strength, balanced ampere turn distribution, strong short circuit resistance.
The positioning structure is added to the body to avoid displacement during transportation. At the same time, all fasteners are equipped with fastening nuts to ensure that the fasteners are not loose during long-term operation.
This product is a fully sealed structure. The vacuum oil filling process is adopted when the transformer is packaged, which completely removes the moisture in the transformer, ensures the isolation of the transformer oil from the outside air, prevents the aging of the oil, and improves the operation reliability of the transformer. All transformers of the capacity section are equipped with pressure relief valves, and gas relays with alarm and trip functions can be installed according to user's demand, which ensures the safe operation of transformers.
Corrugated oil tank is adopted. This kind of oil tank has the advantages of simple processing, high mechanical strength, good welding effect and no leakage. And because of the strong fluidity of the oil, the heat dissipation capacity of the product is improved.
The product is beautiful in appearance, small in volume and small in floor area. It is an ideal maintenance free product.

Parameter

Technical Specification

1.S13-35kV Technical parameters of non-excitation voltage regulating transformer

Rated Capacity (kVA)	High voltage (kV)	Tapping range	Low voltage (kV)	Vector Group	Impedance Voltage (%)	No-load Loss (W)	Load Loss (W)	No-Ioad current (%)
50	35 38.5	±2x2.5% ±5%	0.4	Dyn11 Yyn0	6.5	160	1200/1140	1.3
100						230	2010/1910	1.1
125						270	2370/2260	1.1
160						280	2820/2680	1.0
200						310	3320/3160	1.0
250						400	3950/3760	0.95
315						480	4750/4530	0.95
400						580	5740/5470	0.85
500						680	6910/6580	0.85
630						830	7860	0.65
800						980	9400	0.65
1000						1150	11500	0.65
1250						1400	13900	0.6
1600						1690	16600	0.6
2000						1990	19700	0.55
2500						2360	23200	0.55

2.S13-35kV Technical parameters of non-excitation voltage regulating transformer

Rated Capacity (kVA)	High voltage (kV)	Tapping range	Low voltage (kV)	Vector Group	Impedance Voltage (%)	No-load Loss (W)	Load Loss (W)	No-Ioad current (%)
630	35	±2×2.5% ±5%	3.15 6.3 10.5	Yd11	6.5	830	7860	0.65
800						980	9400	0.65
1000						1150	11500	0.65
1250						1400	13900	0.55
1600						1690	16600	0.45
2000						2170	18300	0.45
2500						2560	19600	0.45
3150	35~38.5	±2×2.5% ±5%	3.15 6.3 10.5		7.0	3040	23000	0.45
4000						3610	27300	0.45
5000						4320	31300	0.45
6300					8.0	5240	35000	0.45
8000	35~38.5	±2×2.5%	3.15 3.3 6.3 6.6 10.5	YNd11		7200	38100	0.35
10000						8700	45300	0.35
12500						10000	53800	0.3
16000						12100	65800	0.3
20000						14400	79500	0.3
25000					10.0	17000	94000	0.25
31500					10.0	20200	112000	0.25

3.S13-35kV Technical parameters of on load tap changer

Rated Capacity (kVA)	High voltage (kV)	Tapping range	Low voltage (kV)	Vector Group	Impedance Voltage (%)	No-load Loss (W)	Load Loss (W)	No-Ioad current (%)
2000	35	±3×2.5%	6.3 10.5	Yd11	6.5	2300	19200	0.5
2500	35		6.3 10.5		6.5	2720	20600	0.5
3150	35~38.5		6.3 10.5		7.0	3230	24700	0.5
4000						3870	29100	0.5
5000						4640	34200	0.5
6300					8.0	5630	36700	0.5
8000	35~38.5		6.3 6.6 10.5	YNd11		7870	40600	0.4
10000						9280	48000	0.4
12500						1090	56800	0.35
16000						1310	70300	0.35
20000						1550	82100	0.35
25000					10.0	1830	97800	0.3
31500					10.0	2180	116000	0.3

Oil Immersed Transformer

35kV Three Phase Oil Immersed Distribution Transformer