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Baoding Zhongyi Electrical Material Manufacturing Co., Ltd.

Oil-immersed Power Transformer

Product Name:S11 Series 6kV-35kV power Transformer With Off Circuit Tap Changer

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Product Description
The products implement the National Standard GB1094-2013 Power Transformer and GB / T6451-2015 Three-phase Oil-immersed Power Transformer Technical Parameters and Requirements, and are recommended as the major equipment products for the national urban and rural power grid construction and retrofit by the State Economic and Trade Commission.
S11 series transformer adopts high quality material for copper winding, especially applying the new technology and new material for the coil insulation and active parts, thus the no-load and the load loss are obviously reduced, the performance and structure are more reliable and superior.

Product Features
●Good Economic Performance 
The no-load loss for S11 series products decreased 10.3% averagely, no-load current decreased 22.4% based on S9 series.
●Long Service Life
Transformer tank adopts hermetical structure, tank and tank cover can be connected by bolts or welded firmly, the transformer oil won’t contact with air, so that extend the service life effectively.
●High Operation Reliability
Improve the relevant sealing parts for the tank, increase the reliability and advance the technical level to ensure the reliability of the seal.
●Small Installation Area
S11-M series transformer tank uses the corrugated plate radiator. When the oil temperature changes, the corrugated plate will proceed thermal expansion, which can replace the role of the oil conservator. the corrugated plate tank has beautiful appearance, less occupied area.

Model and Meaning


Table 1: 6Kv, 10kV & 30kVA-2500kVA Power Transformer With Off Circuit Tap Changer

Rated Capacity (kVA)    Voltage Combination Connection Group Symbol      No-load Loss R(W) Load Loss  R(W)75℃  Impedance Voltage (%) No-load Current(%) Length L(mm) Width
W (mm)
Height
H(mm)
Gauge  Horizontal*Vertical (mm) Active parts Weight(Kg) Oil Weight(Kg) Total Weight(Kg)
High Voltage  (KV) Tapping Range of High Voltage Low Voltage (KV)
30 6
6.3
10
10.5
±5%
 ±2×2.5%
0.4 Dyn11
Yzn11
Yyn0
100 630/600 4.0 2.8 980 735 1145 400*400 178 78 355
50 130 910/870 2.5 1017 758 1205 450*400 240 92 415
63 150 1090/1040 2.4 1035 785 1285 450*400 285 105 505
80 180 1310/1250 2.2 1065 800 1290 450*400 330 110 540
100 200 1580/1500 2.1 1072 820 1305 450*400 345 116 590
125 240 1890/1800 2.0 1155 1105 1310 450*550 415 135 705
160 280 2310/2200 1.9 1235 850 1535 550*550 485 155 835
200 340 2730/2600 1.8 1282 860 1557 550*550 582 168 965
250 400 3200/3050 1.7 1310 940 1605 550*550 695 210 1135
315 480 3830/3650 1.6 1465 1120 1915 660*650 855 255 1520
400 570 4520/4300 1.5 1440 1165 1725 660*660 950 295 1590
500 680 5410/5150 1.4 1510 1250 1845 660*650 1150 320 1905
630 810 6200 1.3 1650 1140 1920 660*650 1500 435 2015
800 980 7500 4.5 1.2 2125 1175 2315 820*820 1910 760 3510
1000 1150 10300 1.1 2150 1380 2570 820*820 2125 880 3850
1250 1360 12000 1.0 2355 1485 2570 820*820 2605 960 4610
1600 1640 14500 0.9 2385 1750 2630 820*820 3125 1150 5420
2000 1940 18300 5.0 0.4 1940 1400 1700 820*820 2420 780 4200
2500 2290 21200 0.4 2050 1480 1800 820*820 2560 880 4680

Notes:
1.The Dimension and weight will be changed according to the requirements. These two data in the table will be subject to the factory documents.
2.For the transformer of rated capacity up to 500kVA, the value of load loss above the oblique line in the table is applicable to the connection group Dyn11 or Yzn11. The value of load loss under the oblique line is applicable to the connection group Yyn0.

Technical Parameter for S11 Series 20kV Power Transformer With Off Circuit Tap Changer
(KVA)Rated capaci Voltage Combination  Connection Group Symbol No-load Loss(W) Load Loss (W)75℃ No-load Current (%) Short-circuit Impedance(%)
High Voltage (KV) Tapping ranges of High Voltage  Low Voltage(KV)
30 20 ±5%
±2×2.5%
0.4 Dyn11
Yzn11
Yyn0
100 690/660 2.1 5.5
50 130 1010/960 2.0
63 150 1200/1150 1.9
80 180 1440/1370 1.8
100 200 1730/1650 1.6
125 240 2080/1980 1.5
160 290 2540/2420 1.4
200 340 3000/2860 1.3
250 400 3520/3350 1.2
315 480 4210/4010 1.1
400 570 4970/4730 1.0
500 680 5940/5660 1.0
630 810 6820 0.9 6.0
800 980 8250 0.8
1000 1150 11330 0.7
1250 1380 13200 0.7
1600 1660 15950 0.6
2000 1950 19140 0.6
2500 2340 22220 0.5

Notes:
1.The Dimension and weight will be changed according to the requirements. These two data in the table will be subject to the factory documents.
2.For the transformer of rated capacity up to 500kVA, the value of load loss above the oblique line in the table is applicable to the connection group Dyn11 or Yzn11. The value of load loss under the oblique line is applicable to the connection group Yyn0.
3.The performance parameters in the table are also applicable for HV with dual voltage 20 (10)kV three-phase transformer.

Technical Parameter for S11 Series 35kV Power Transformer With Off Circuit Tap Changer
Model Voltage Combination  Connection Group Symbol No-load Loss (W)75℃ Load Loss  R(W) Impedance Voltage (%) No-load Current(%) Length L(mm) Width W(mm) Height H(mm) Gauge Horizontal*Vertical (mm) Active parts Weight(Kg) Oil Weight(Kg) Total Weight(Kg)
High Voltage (kV) Tapping Range of High Voltage% Low Voltage (kV)
50 35
38.5
±2×2.5%
±5%
0.4               Dyn11/ Yyn0   160 1200/1140 6.5 1.3 1195 935 1825 660*660 300 330 860
100 230 2010/1910 1.1 1200 995 1935 660*660 470 383 1130
125 270 2370/2260 1.1 1235 940 1955 660*660 550 465 1335
160 280 2820/2680 1.0 1285 895 1950 660*660 580 485 1475
200 340 3320/3160 1.0 1310 1150 1985 660*660 680 595 1755
250 400 3950/3760 0.95 1450 1090 2010 660*660 860 650 2000
315 480 4750/4530 0.95 1930 1065 2320 820*820 980 765 2290
400 580 5740/5470 0.85 1850 1165 2015 820*820 1170 885 2725
500 680 6910/6580 0.85 2045 1205 2415 820*820 1340 960 3090
630 830 7860 0.65 2085 1240 2515 660*660 1550 895 3810
800 980 9400 0.65 2305 1615 2685 820*820 1990 1030 4510
1000 1150 11500 0.65 2545 1540 2590 1070*1070 2415 1475 5055
1250 1400 13900 0.60 2495 2010 2675 820*820 2480 1405 5290
1600 1690 16600 0.60 2680 2100 2770 820*820 2600 1490 5450
2000 1990 19700 0.55 2790 2180 2860 820*820 2720 1590 5600
2500 2360 23200 0.55 2900 2290 2980 1070*1070 2830 1720 5760

Notes:
1.The Dimension and weight will be changed according to the requirements. These two data in the table will be subject to the factory documents.
2.For the transformer of rated capacity up to 500KVA, the value of load loss above the oblique line in the table is applicable to the connection group Dyn11. The value of load loss under the oblique line is applicable to the connection group Yyn0.

S11 Series 35kV 630kVA-31500kVA Three-phase Dual Winding Power Transformer With Off Circuit Tap Changer
Model Voltage Combination  Connection Group Symbol No-load Loss (W) Load Loss  R(W) No-load Current(%)

Short circuit impedance (%)

Length L(mm)

Width W(mm)

Height H(mm)

Gauge Horizontal*Vertical (mm)

Active parts Weight(Kg)

Oil Weight(Kg)

Total Weight(Kg)

High Voltage (kV)

Tapping Range of High Voltage%

Low Voltage (kV)
630 35 ±2×2.5%±5% 3.15
6.3
10.5
Yd11 830 7860 0.65 6.5

2400

1700

2210

820*820

2210

900

3250

800 980 9400 0.65

2500

1850

2390

820*820

2350

1030

3500

1000 1150 1150 0.65

2700

1950

2510

820*820

2490

1180

3860

1250 1400 1390 0.55

2900

2050

2630

820*820

2600

1350

4350

1600 1690 1660 0.45

3050

2130

2750

820*820

2810

1580

4855

2000 2170 1830 0.45

3105

2195

2805

1070*1070

2800

1800

5300

2500 2560 1960 0.45

3150

2535

2980

1070*1070

3525

2060

7665

3150 35-38.5 ±2×2.5%±5% 3.15
6.3
10.5
3040 2300 0.45 7.0

3920

2725

2840

1070*1070

3995

2205

8565

4000 3610 2730 0.45

3310

2915

3070

1070*1070

4825

2560

10115

5000 4320 3130 0.45

3480

3020

3145

1070*1070

5700

2635

11305

6300 5240 3500 0.45 8.0

3590

2905

3210

1475*1475

7120

3240

13510

8000 35-38.5 ±2×2.5% 3.15 3.3
6.3
6.6
10.5
YNd11 7200 3840 0.35

4070

3050

3595

1475*1475

8875

3840

16690

10000 8700 4530 0.35

4106

2795

3655

2000*1475

10305

3600

17690

12500 1000 5380 0.30

4570

3010

3840

1475*1475

12830

4310

20990

16000 1210 6580 0.30

5235

3295

4615

2000*1475

16010

6650

27660

20000 1440 7950 0.30

5360

3415

4660

2000*1475

18820

7600

32170

25000 1700 9400 0.25 10.0

5830

3810

4860

2000*1475

22360

9800

42600

31500 2020 112000 0.25

6290

4290

5260

2000*1475

25110

12010

49960


Note: 1: For the transformer of low voltage 10.5kV, the connection group symbol is applicable to Dyn11.
Note: 2: For the transformer of rated capacity 3150kVA or above, the -5% tapping position is for maximum current tap.
Note: 3: When the annual average load rate for the transformer is between 35% to 45%, the loss value in the table can obtain the highest operational efficiency.

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