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Power Generation & Distribution

Three Phase : 22/0.433 KV, 50 Hz

Rating KVA

Standard
NLL(W)
LL(W)
%Z
Efficiency at UPF & 0.5L
Temp. rise
Weights kgs.
Dimensions
 
Total
Oil
L
B
H
100
IS 2026
400
2300
5
97.37
35 /40° C
915
305
1550
1650
1925
200
IS 2026
650
4000
5
97.73
35 /40° C
1500
390
1600
2300
2050
315
IS 2026
850
5500
5
98.02
50 /55° C
1710
445
1650
1825
2100
630
IS 2026
1100
8500
5
98.50
50 /55° C
2650
590
2450
1725
2375
990
IS 2026
1600
13000
5
98.55
50 /55° C
3420
715
2500
2350
2450
1500
IS 2026
2300
19000
5
98.60
50 /55° C
5350
980
3950
2550
2550
2000
IS 2026
2700
24000
5
98.68
50 /55° C
5880
1120
3600
2675
2750

Three Phase : 33/0.433 KV, 50 Hz

Rating KVA

Standard
NLL(W)
LL(W)
%Z
Efficiency at UPF & 0.5L
Temp. rise
Weights kgs.
Dimensions
 
Total
Oil
L
B
H
100
IS 2026
450
2300
5
97.32
35 /40° C
1040
385
1600
1700
2000
200
IS 2026
750
4000
5
97.68
35 /40° C
1660
500
1650
2200
2125
315
IS 2026
900
5700
5
97.95
50 /55° C
1915
565
1700
1875
2200
630
IS 2026
1200
8500
5
98.48
50 /55° C
2905
720
2475
1750
2500
990
IS 2026
1800
13000
5
98.53
50 /55° C
3700
865
2550
2375
2550
1500
IS 2026
2400
19000
5
98.59
50 /55° C
5400
1120
3950
2450
2600
2000
IS 2026
2800
24000
5
98.68
50 /55° C
6330
1280
3600
2550
2800

3 Phase Dry Type & Oil Cool Distribution Transformers
11 KV / 0.433 KV, 50 Hz

Rating KVA

Standard
NLL(W)
LL(W)
%Z
Efficiency at UPF & 0.5L
Temp. rise
Weights kgs.
Dimensions
 
Total
Oil
L
B
H
25
IS 2026
80
615
4.5
97.58%
35 /40° C
385
115
910
700
1280
63
IS 2026
180
1235
4.5
97.49%
35 /40° C
626
177
1050
930
1400
100
IS 2026
260
1760
4.5
97.60%
35 /40° C
730
190
1180
850
1425
200
IS 2026
500
2800
4.5
97.52%
35 /40° C
1000
290
1440
1100
1700
315
IS 2026
800
4250
4.5
97.48%
50 /55° C
1430
340
1950
1850
1850
630
IS 2026
970
8000
5
97.58%
50 /55° C
2440
490
2250
2150
2100
990
IS 2026
1400
11500
5
97.61%
50 /55° C
3290
670
2350
2250
2400
1500
IS 2026
2200
17000
5
98.90%
50 /55° C
5300
1100
3950
2100
2750
2000
IS 2026
2500
23000
6.25
98.74%
50 /55° C
5600
1060
3600
2700
2850

Single Phase : 11 KV / 240 V, 50 Hz

Rating KVA

Standard
NLL(W)
LL(W)
%Z
Efficiency at UPF & 0.5L
Temp. rise
Weights kgs.
Dimensions
 
Total
Oil
L
B
H
10
IS 1180
IS 2026
50
210
4
98.56%
40 /45° C
190
30
720
560
375
16
IS 1180
IS 2026
75
250
4
98.72%
40 /45° C
210
35
770
590
925
25
IS 1180
IS 2026
68
275
4
98.69%
40 /45° C
237
40
820
620
975

STL Transformers are made under a stringent stagewise QA plan covering incoming area, production stages and final despatches using state of the art production and testing facilities. STL possesses a team of qualified and experienced professionals to augment all activities and has an infrastructure and testing facility to manufacture and test transformers up to 33 KV Class and 2 MVA capacity in oil cooled. STL also manufactures and tests Dry Type Transformers up to 1 MVA, 33KV Class as per IS 1171.

Presently, STL has a manufacturing capacity of 200 MVA, with DRY TYPE & FURANACE TRANSFORMERS in its product range. Further capacity expansion is on the anvil. The transformers are type test certified for Temp. Rise, Lightning Impulse Voltage withstand test and short circuit withstand test. These tests have been carried out at ERDA and CPRI.

Fittings:
Silica Gel Breather, Pressure Release Valve*, Cable Box/Bare Bushing on HV and Cable Box/ Bus Duct on LV, WTI*, OTI*, MOG*, Off Load Tap Changer, Fin type Radiators, Lifting Lugs, Mounting Channels and Wheels, Rating and Diagram plate,etc.

STL also has 3 PHASE DRY TYPE TRANSFORMER in its product range. STL has manufactured upto 200 KVA 3 PHASE DRY TYPE TRANSFORMER and has the infrastructure to manufacture and test 3 PHASE DRY TYPE TRANSFORMER upto 1 MVA, 11KV Class.


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