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Applicable Standards
- IEC (International Electro technical Commission)
- ANSI (American National Standard Institution)
- BS (British Standards)
- IS (Indian Standard)
Description
Kotsons manufactures a wide range of distribution and power transformers ranging from 25 KVA to 20 MVA with voltage class of 33 KV. These transformers can be free breathing or hermetically sealed. Conventional transformers are fitted with a conservator with breather for free  breathing while hermetically sealed are without breathing with bolted cover. Hermetically sealed transformers are totally maintenance free and are particularly suited for use in exposed outdoor environments such as moisture, salt or dust laden atmospheres. They are used extensively in chemical plants, oil and gas terminals where poor accessibility makes regular maintenance undesirable. Transformers immersed in synthetic coolants are suitable for use indoors, with adequate ventilation, or near to the load centre where oil would not be considered environmentally acceptable.
The liquid filled transformers can be supplied with cooling either by corrugations on the side of the tank or Pressed steel radiators mounted on tank body. Transformers can be filled with either oil or one of several low flammability synthetic fluids such as midel. Both types can be supplied with HV and LV Switchgear incorporated into substations.
Kotsons can supply conventional/hermetically sealed/bolted type, indoor/outdoor type, pole/platform mounted 3 phase, 50/60 Hz, oil immersed, ONAN/ONAF/ OFWF cooled, step up/step down, double wound with Al/Cu conductor, Continuous duty transformers from 5 KVA to 20 MVA upto 33 KV Class with ‘A’ Class Insulation and designed to withstand Short Circuit, & Impulse Test in accordance to IEC / BS / ANSI / IS / NEEMA.
KOTSONS STANDARD TRANSFORMERS
In order to meet the growing demand of transformers with short deliveries, Kotsons have developed a separate production system called KST (Kotsons Standard Transformers). This range of KST are manufactured with standard losses and in accordance to IS : 2026 latest. Kotsons can supply a comprehensive range as depicted below in short delivery periods.
The second of our production system known as Kotsons Repeat transformer enables us to reproduce any of our previous transformer designs again in the shortest time with the object of keeping delivery time to a minimum.
Details of Characteristics & dimensions of Kotsons standard transformers with standard fittings manufactured in accordance with IS : 2026 latest., and can be delivered in short delivery period upon order confirmation.
Specification for KST (Kotsons Standard Transformer)
Kotsons make outdoor type, 3 phase, 50 Hz, oil immersed, conventional bolted cover, ONAN cooled, Pole / Platform mounted, double wound with Cu conductor, step up, core type continuous duty transformers with + 2.5% to - 7.5% taps on HT side for HT variation and leads to be brought out on off circuit tap changing switch with locking device and outside indicator arrangement and connected in delta/star as per Vector group ref. Dyn11.
The temperature rise will be 50/55° C in Oil/Winding respectively over a maximum ambient temperature as per IS. The transformers will be manufactured as per IS: 2026 latest, complete with fittings/accessories as stated below.
Rated Primary Voltage : 11KV
Secondary Voltage : 416/240V |
ONAN Cooled, Outdoor type, Oil immersed Copper Wound, Open Type with Conservator |
| Capacity kVA |
Efficiency at 100% load (%) |
Voltage Regulation P.F.=1 (%) |
Noise Level db (A) : 1m |
Outline Dimension Approx. (mm) |
Oil qty (Litres) |
Total weight (Kgs.) |
| P.F.=1 |
P.F.=0.8 |
H |
L |
W |
| 50 |
97.48 |
96.85 |
2.26 |
45 |
1300 |
1080 |
520 |
115 |
420 |
| 100 |
97.71 |
97.14 |
2.06 |
46 |
1400 |
1230 |
550 |
150 |
600 |
| 160 |
98.19 |
97.73 |
1.63 |
47 |
1480 |
1290 |
630 |
210 |
825 |
| 200 |
98.30 |
97.88 |
1.52 |
47 |
1580 |
1340 |
675 |
260 |
990 |
| 250 |
98.32 |
97.90 |
1.51 |
48 |
1655 |
1385 |
750 |
320 |
1200 |
| 315 |
98.33 |
97.92 |
1.50 |
50 |
1735 |
1385 |
830 |
360 |
1400 |
| 400 |
98.44 |
98.05 |
1.42 |
50 |
1800 |
1410 |
950 |
370 |
1600 |
| 500 |
98.50 |
98.13 |
1.37 |
52 |
1850 |
1520 |
1000 |
450 |
1920 |
| 630 |
98.62 |
98.27 |
1.31 |
52 |
1920 |
1620 |
1030 |
530 |
2230 |
| 800 |
98.56 |
98.20 |
1.37 |
54 |
2000 |
1830 |
1030 |
675 |
2700 |
| 1000 |
98.63 |
98.29 |
1.32 |
54 |
2100 |
2040 |
1040 |
780 |
3160 |
| 1250 |
98.72 |
98.40 |
1.29 |
56 |
2140 |
2070 |
1210 |
840 |
3400 |
| 1500 |
98.78 |
98.48 |
1.24 |
56 |
2240 |
2150 |
1240 |
970 |
3900 |
| 2000 |
98.81 |
98.51 |
1.22 |
52/3cm |
2350 |
2230 |
1390 |
1080 |
4625 |
| 2500 |
98.88 |
98.60 |
1.18 |
52/3cm |
2480 |
2300 |
1420 |
1375 |
5700 |
| 3000 |
98.92 |
98.65 |
1.14 |
52/3cm |
2570 |
2380 |
1450 |
1530 |
6330 |
Rated Primary Voltage : 22KV
Secondary Voltage : 416/240V |
ONAN Cooled, Outdoor type, Oil immersed Copper Wound, Open Type with Conservator |
| Capacity kVA |
Efficiency at 100% load (%) |
Voltage Regulation P.F.=1 (%) |
Noise Level db (A) : 1m |
Outline Dimension Approx. (mm) |
Oil qty (Litres) |
Total weight (Kgs.) |
| P.F.=1 |
P.F.=0.8 |
H |
L |
W |
| 50 |
97.48 |
96.85 |
2.26 |
45 |
1300 |
1100 |
520 |
120 |
420 |
| 100 |
97.71 |
97.14 |
2.06 |
46 |
1410 |
1230 |
565 |
170 |
640 |
| 160 |
98.19 |
97.73 |
1.63 |
47 |
1500 |
1290 |
640 |
215 |
820 |
| 200 |
98.30 |
97.88 |
1.52 |
47 |
1620 |
1345 |
680 |
280 |
1025 |
| 250 |
98.32 |
97.90 |
1.51 |
48 |
1670 |
1390 |
760 |
335 |
1240 |
| 315 |
98.33 |
97.92 |
1.50 |
50 |
1735 |
1390 |
840 |
375 |
1475 |
| 400 |
98.44 |
98.05 |
1.42 |
50 |
1800 |
1420 |
960 |
415 |
1630 |
| 500 |
98.50 |
98.13 |
1.37 |
52 |
1850 |
1535 |
1015 |
495 |
2050 |
| 630 |
98.62 |
98.27 |
1.31 |
52 |
1920 |
1655 |
1045 |
580 |
2410 |
| 800 |
98.56 |
98.20 |
1.37 |
54 |
2000 |
1845 |
1050 |
715 |
2925 |
| 1000 |
98.63 |
98.29 |
1.32 |
54 |
2100 |
2050 |
1060 |
825 |
3460 |
| 1250 |
98.72 |
98.40 |
1.29 |
56 |
2140 |
2090 |
1230 |
930 |
3710 |
| 1500 |
98.78 |
98.48 |
1.24 |
56 |
2240 |
2165 |
1255 |
1050 |
4300 |
| 2000 |
98.81 |
98.51 |
1.22 |
52/3cm |
2350 |
2245 |
1410 |
1215 |
5000 |
| 2500 |
98.88 |
98.60 |
1.18 |
52/3cm |
2480 |
2340 |
1435 |
1460 |
6020 |
| 3000 |
98.92 |
98.65 |
1.14 |
52/3cm |
2570 |
2400 |
1465 |
1620 |
6650 |
Rated Primary Voltage : 33KV
Secondary Voltage : 416/240V |
ONAN Cooled, Outdoor type, Oil immersed Copper Wound, Open Type with Conservator |
| Capacity kVA |
Efficiency at 100% load (%) |
Voltage Regulation P.F.=1 (%) |
Noise Level db (A) : 1m |
Outline Dimension Approx. (mm) |
Oil qty (Litres) |
Total weight (Kgs.) |
| P.F.=1 |
P.F.=0.8 |
H |
L |
W |
| 100 |
97.70 |
97.13 |
2.06 |
46 |
1420 |
1230 |
575 |
185 |
655 |
| 160 |
98.16 |
97.70 |
1.63 |
47 |
1520 |
1290 |
650 |
235 |
835 |
| 200 |
98.29 |
97.86 |
1.52 |
47 |
1580 |
1350 |
690 |
305 |
1070 |
| 250 |
98.30 |
97.88 |
1.51 |
48 |
1655 |
1390 |
770 |
360 |
1310 |
| 315 |
98.35 |
97.94 |
1.50 |
50 |
1735 |
1400 |
850 |
390 |
1535 |
| 400 |
98.50 |
98.13 |
1.42 |
50 |
1800 |
1430 |
980 |
435 |
1735 |
| 500 |
98.49 |
98.11 |
1.37 |
52 |
1850 |
1550 |
1030 |
520 |
2135 |
| 630 |
98.67 |
98.33 |
1.31 |
52 |
1920 |
1670 |
1060 |
610 |
2470 |
| 800 |
98.56 |
98.20 |
1.37 |
54 |
2000 |
1860 |
1070 |
740 |
2980 |
| 1000 |
98.63 |
98.29 |
1.32 |
54 |
2100 |
2060 |
1080 |
850 |
3580 |
| 1250 |
98.68 |
98.35 |
1.29 |
56 |
2140 |
2100 |
1250 |
985 |
3830 |
| 1500 |
98.78 |
98.48 |
1.24 |
56 |
2240 |
2180 |
1270 |
1080 |
4525 |
| 2000 |
98.79 |
98.48 |
1.22 |
52/3cm |
2350 |
2260 |
1420 |
1235 |
5200 |
| 2500 |
98.84 |
98.55 |
1.18 |
52/3cm |
2480 |
2380 |
1450 |
1565 |
6300 |
| 3000 |
98.92 |
98.65 |
1.14 |
52/3cm |
2570 |
2420 |
1480 |
1690 |
6860 |
Rated Primary Voltage : 33KV
Secondary Voltage : 11KV |
ONAN Cooled, Outdoor type, Oil immersed Copper Wound, Open Type with Conservator |
| Capacity kVA |
Efficiency at 100% load (%) |
Voltage Regulation P.F.=1 (%) |
Noise Level db (A) : 1m |
Outline Dimension Approx. (mm) |
Oil qty (Litres) |
Total weight (Kgs.) |
| P.F.=1 |
P.F.=0.8 |
H |
L |
W |
| 3150 |
99.02 |
98.75 |
1.04 |
54/3m |
3000 |
2800 |
2900 |
2000 |
8450 |
| 5000 |
99.39 |
99.02 |
0.79 |
56/3m |
3200 |
2500 |
3150 |
2400 |
11300 |
| 6300 |
99.51 |
99.14 |
0.68 |
56/3m |
3300 |
3000 |
3250 |
3200 |
15000 |
| 8000 |
99.62 |
99.21 |
0.67 |
58/3m |
3430 |
3300 |
3350 |
4100 |
18000 |
| 10,000 |
99.68 |
99.32 |
0.59 |
58/3m |
3600 |
3400 |
3800 |
5800 |
21000 |
Note :
- The dimensions and weights shown above apply to a typical range of KST (Kotsons standard transformers) design to the specification IS : 2026. As all transformers are usually design and built to customers specification their exact dimensions and weights can vary.
- Due to improvements continuously taking place in design, the details given here may vary marginally irrespective of Length, Width, Height, Oil and Total Weight . However the variations will be within permissible tolerance limits as per IS 2026 latest .
Standard Accessories
Oil Level Gauge, Pressure Release Device, Shut off valve, Off Load Tap Changer Handle, Breather, Name Plate, Sampling Valve, Drain Valve, Roller, Lifting Eye Oil Filling hole with Cap, H.V. Porceline Bushing, L.V. Porceline Bushing, Hand Hole, Lifting Lug, Filter Valve, Radiator/Corrugations, Conservator Drain Valve, Earthing Terminal, Pulling Eye, Jacking Pad.
Optional Accessories
Buchholz Relay, On load Tap Changer, RTCC, AVR, Marshalling Box, Oil Temperature Indicator, Winding Temperature Indicator, Skid base.
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