35kV Oil-Immersed Transformer

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35kV transformers of S11, SZ11 and SFZ11 series are manufactured in conformity with IEC60076 standards (applicable International Electrotechnical Commission standards), GB1094 standards (applicable state standards of the People's Republic of China) and GB/T6451 “Technical Parameters and Requirements of Three-Phase Oil-Immersed Power Transformer”.

The voltage range of on-load voltage regulation is 35±2*2.5%kV, 38.5±2*2.5%kV, 35±3*2.5%kV and 38.5±3*2.5%kV. The voltage can be adjusted manually, electrically or automatically at the primary voltage side within the specified range with the help of on-load tap changer.

35kV transformers with above 6300kVA capacity are equipped with folded plate structure oil tanks, which increase the mechanical strength, decrease welding joints, and improve the appearance quality of transformers. It is a new generation of product and it has high economic effectiveness.

Product introduction

Working Conditions:

No.	Conditions		Units	Parameter Values
1	Pollution Grade			IV
2	Ambient Temperature	Maximum Daily Temperature	℃	40
		Minimum Daily Temperature	℃	-45
		Maximum Daily Temperature Difference	K	25
		Average Temperature of the Hottest Month	℃	30
		Maximum Annual Average Temperature	℃	20
3	Humidity	Average Daily Relative Humidity	%	≤95
3	Humidity	Average Monthly Relative Humidity	%	≤90
4	Altitude		m	1000
5	Solar Radiation Intensity		W/cm²	0.1
6	Maximum Icing Thickness		mm	10
7	Maximum average wind speed: keeping in good conditions for 10min at 10m from the ground level		m/s	35
8	Earthquake Resistance	Horizontal Ground Acceleration	m/s²	2
8	Earthquake Resistance	Safety Coefficient of 3 Since Resonance Cycles		≥1.67
9	Installation Site			Outdoor
Note 1: Working conditions in high altitude regions (above 1000m) must be adjusted in conformity with Q/GDW 13001-2014 (High Altitude External Insulation Configuration Technical Specification).

Product Parameters:
Table 1 35kV - 50kV.A ~ 2500kV.A, Three-Phase Duplex Windings, No-Load Voltage Regulation, Distribution Transformer

Rated Capacity (KV.A)	Voltage Combination & Tapping Range			Connection Symbol	No-Load Loss (kW)	On-Load Loss (kW)	No-Load Current (%)	Short-Circuit Impedance (%)
Rated Capacity (KV.A)	High Voltage (kV)	High Voltage Tapping Range (%)	Low Voltage (kV)	Connection Symbol	No-Load Loss (kW)	On-Load Loss (kW)	No-Load Current (%)	Short-Circuit Impedance (%)
50	35 38.5	±2×2.5 ±5	0.4	Dyn11 Yyn0	0.160	1.20/1.14	1.3	6.5
100					0.230	2.01/1.91	1.1
125					0.270	2.37/2.26	1.1
160					0.280	2.82/2.68	1.0
200					0.340	3.32/3.16	1.0
250					0.400	3.95/3.76	0.95
315					0.480	4.75/4.53	0.95
400					0.580	5.74/5.47	0.85
500					0.680	6.91/6.58	0.85
630					0.830	7.86	0.65
800					0.980	9.40	0.65
1 000					1.15	11.5	0.65
1 250					1.40	13.9	0.60
1 600					1.69	16.6	0.60
2 000					1.99	19.7	0.55
2 500					2.36	23.2	0.55
Note 1: If the rated capacity is 500kV.A or below, the data of “On-Load Loss” on the left of slash (/) is for Dyn11, on the right for Yyn0. Note 2: If transformers’ annual average load rate is between 30% and 36%, using loss values in this Table can obtain the highest operating efficiency.

Table 2 35kV - 630 kV.A ~ 31 500 kV.A, Three-Phase Duplex Windings, No-Load Voltage Regulation, Power Transformer

Rated Capacity (KV.A)	Voltage Combination & Tapping Range			Connection Symbol	No-Load Loss (kW)	On-Load Loss (kW)	No-Load Current (%)	Short-Circuit Impedance (%)
Rated Capacity (KV.A)	High Voltage (kV)	High Voltage Tapping Range (%)	Low Voltage (kV)	Connection Symbol	No-Load Loss (kW)	On-Load Loss (kW)	No-Load Current (%)	Short-Circuit Impedance (%)
630	35	±2×2.5 ±5	3.15 6.3 10.5	Yd11	0.830	7.86	0.65	6.5
800					0.980	9.40	0.65
1 000					1.15	11.5	0.65
1 250					1.40	13.9	0.55
1 600					1.69	16.6	0.45
2 000					2.17	18.3	0.45
2 500					2.56	19.6	0.45
3 150	35~38.5	±2×2.5 ±5	3.15 6.3 10.5		3.04	23.0	0.45	7.0
4 000					3.61	27.3	0.45
5 000					4.32	31.3	0.45
6 300					5.24	35.0	0.45	8.0
8 000	35~38.5	±2×2.5	3.15 3.3 6.3 6.6 10.5	YNd11	7.20	38.4	0.35
10 000					8.70	45.3	0.35
12 500					10.0	53.8	0.30
16 000					12.1	65.8	0.30
20 000					14.4	79.5	0.30
25 000					17.0	94.0	0.25	10.0
31 500					20.2	112	0.25	10.0
Note 1: If the low voltage is 10.5kV, transformers of Dyn11 can also be supplied. Note 2: -5% is the maximum current tapping position, if the rated capacity is 3150kV.A or above. Note 3: If transformers’ annual average load rate is between 35% and 45%, using loss values in this Table can obtain the highest operating efficiency.

Table 3 35kV - 2000 kV.A ~ 31500 kV.A, Three-Phase Duplex Windings, On-Load Voltage Regulation, Power Transformer

Rated Capacity (KV.A)	Voltage Combination & Tapping Range			Connection Symbol	No-Load Loss (kW)	On-Load Loss (kW)	No-Load Current (%)	Short-Circuit Impedance (%)
Rated Capacity (KV.A)	High Voltage (kV)	High Voltage Tapping Range (%)	Low Voltage (kV)	Connection Symbol	No-Load Loss (kW)	On-Load Loss (kW)	No-Load Current (%)	Short-Circuit Impedance (%)
2 000	35	±3×2.5	6.3 10.5	Ydll	2.30	19.2	0.50	6.5
2 500	35	±3×2.5	6.3 10.5		2.72	20.6	0.50	6.5
3 150	35~38.5	±3×2.5	6.3 10.5		3.23	24.7	0.50	7.0
4 000					3.87	29.1	0.50
5 000					4.64	34.2	0.50
6 300					5.63	36.7	0.50	8.0
8 000	35~38.5	±3×2.5	6.3 6.6 10.5	YNdll	7.87	40.6	0.40
10 000					9.28	48.0	0.40
12 500					10.1	56.8	0.35
16 000					13.1	70.3	0.35
20 000					15.5	82.7	0.35
25 000					18.3	97.8	0.30	10.0
31 500					21.8	116	0.30	10.0
Note 1: If the low voltage is 10.5kV, transformers of Dynll can also be supplied. Note 2: -7.5% is the maximum current tapping position. Note 3: If transformers’ annual average load rate is between 35% and 45%, using loss values in this Table can obtain the highest operating efficiency.