Powering Safe & Efficient Energy Distribution
Transformer Dimensions and Ratings
|
KVA Ratings |
500, 1000, 1500, 2000, 2500, 5000 and higher |
|
No. of Phases |
Three-Phase |
|
Frequency |
50 Hz – 60 Hz |
|
Primary Voltage |
Up to 230 kV |
|
Secondary Voltage |
120 V – 69 kV |
|
Tapping Range |
±5% or ±10% |
|
Winding Material |
Copper, Aluminum |
|
Cooling Type |
ONAN, ONAF |
|
Fluid Type |
Non-PCB Mineral Oil or FR3 Fluid |
|
Connection Type |
Delta-Wye |
|
Mounting |
Stationary Substation Installation |
| Transformer Testing (ANSI C57.12.90) | |
|---|---|
|
All substation transformers undergo the following standard commercial tests: |
|
|
No-Load Losses |
Evaluated at rated voltage |
|
Load Losses |
Measured under rated conditions |
|
Percent Impedance |
Calculated at rated current |
|
Excitation Current Test |
Conducted at 100% voltage |
|
Ratio Tests |
Ensured across all tap settings |
|
Polarity and Phase Relation Tests |
Verifies orientation |
|
Induced Potential Tests |
Simulates electrical stress scenarios |
|
Impulse Tests |
Full wave and reduced wave performance tested |
| Standards and Certifications | |
|---|---|
|
Sound Level |
Designed to meet NEMA Noise Standards |
|
IEEE Compliance |
Conforms to IEEE C57.12.10 Standards |
|
UL Certification |
UL Listed and Compliant |
|
Efficiency |
Meets DOE 2016 Efficiency Standards or higher |
|
Temperature Rise Options |
55°C, 65°C, 65/75°C |
| Primary Protection Devices | |
|---|---|
|
Internal Fuses |
Current-limiting types for overcurrent protection |
|
External Surge Arresters |
Available for high-voltage applications |
| Tank and Material Specifications | |
|---|---|
|
Tank Material |
Mild Steel or Stainless Steel with advanced coating systems |
|
Tank Coating System |
Complies with IEEE Std C57.12.28 for durability |
|
Enclosure Type |
Weather-resistant construction suitable for outdoor substation environments |
| Quality Control and Warranty | |
|---|---|
|
Quality System |
ISO 9001 Certified |
|
Routine Tests |
Conducted per ANSI® and IEEE® standards |
|
Warranty |
Industry-standard coverage for defects and performance |
| Rated Capacity (kVA) | High Voltage (kV) | Tapping Range | Low Voltage (kV) | Vector Group | No-load Loss (%) | Impedance Voltage (%) | No-load Losses (kW) | On-load Losses (kW) |
|---|---|---|---|---|---|---|---|---|
|
6300 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.77 |
630 |
9.3 |
36 |
|
8000 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.77 |
910 |
11.2 |
45 |
|
10000 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.72 |
1310 |
13.2 |
53 |
|
12500 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.72 |
1580 |
15.6 |
63 |
|
16000 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.67 |
1890 |
18.8 |
77 |
|
20000 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.67 |
2310 |
22.0 |
93 |
|
25000 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.62 |
2730 |
26.0 |
110 |
|
31500 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.60 |
3200 |
30.8 |
133 |
|
40000 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.56 |
3830 |
36.8 |
156 |
|
50000 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.52 |
4540 |
44.0 |
194 |
|
63000 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.48 |
5410 |
52.0 |
234 |
|
75000 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.42 |
6200 |
59.0 |
278 |
|
90000 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.38 |
7500 |
68.0 |
320 |
|
120000 |
110, 112 |
±2×2.5% |
6.3, 6.6, 10.5, 11 |
YNd11 |
0.34 |
10300 |
84.8 |
397 |
| Rated Capacity (kVA) | High Voltage (kV) | Tapping Range | Low Voltage (kV) | Vector Group | No-load Current (%) | Impedance Voltage (%) - Step Up | Impedance Voltage (%) - Step Down | No-load Losses (kW) | On-load Losses (kW) |
|---|---|---|---|---|---|---|---|---|---|
|
6300 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.82 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
11.2 |
47.0 |
|
8000 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.78 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
13.2 |
56.0 |
|
10000 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.74 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
15.8 |
66.0 |
|
12500 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.70 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
18.4 |
78.0 |
|
16000 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.68 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
22.4 |
94.0 |
|
20000 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.65 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
26.4 |
112.0 |
|
25000 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.60 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
30.8 |
133.0 |
|
31500 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.58 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
36.8 |
157.0 |
|
40000 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.56 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
43.6 |
189.0 |
|
50000 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.55 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
52.0 |
225.0 |
|
63000 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.55 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
61.6 |
270.0 |
|
75000 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.50 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
70.2 |
307.7 |
|
80000 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.50 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
73.7 |
323.0 |
|
120000 |
110±2×2.5%, 121±2×2.5% |
35, 38.5 |
6.3, 6.6 / 10.5, 11 |
Yyn0d11 |
0.50 |
HV–MV: 17.5–18.5HV–LV: 17.5–18.5MV–LV: 6.5 |
HV–MV: 10.5HV–LV: 17.5–18.5MV–LV: 6.5 |
87.1 |
381.8 |
| Category | Recommended Technical Fields |
|---|---|
|
Electrical Ratings |
HV/MV/LV ratings, phases (1Φ/3Φ), vector group (YNd11, Yy0, etc.), frequency (50/60 Hz) |
|
Thermal Performance |
Cooling method (ONAN, ONAF, OFAF), winding temperature rise (65/75 °C), hot-spot limit |
|
Tap-Changer |
OLTC/NLTC type, voltage range (±2×2.5%, ±4×1.25%), number of steps, rated current |
|
Losses & Efficiency |
No-load losses (kW), load losses (kW), guaranteed efficiency at 25%, 50%, 100% load |
|
Impedance |
%Z @ rated MVA, short-circuit withstand level, positive/zero sequence impedance |
|
Insulation & BIL |
Lightning impulse (LI), switching impulse (SI), power frequency withstand levels (kV) |
|
Sound & Vibration |
Guaranteed sound level (dBA), vibration isolators |
|
Mechanical Data |
Core material, core configuration (3-limb/5-limb), total weight, transport weight, tank size |
|
Testing & Compliance |
IEC 60076, ANSI C57, routine/type/special test checklist |
|
Accessories |
Bushing type (OIP/RIP), PRD, Buchholz relay, oil level indicators, digital temp monitors |
| Category | Recommended Technical Fields |
|---|---|
|
Electrical Ratings |
Valve/line side voltages, MVA rating, bipolar/monopolar configuration |
|
DC Specific Design |
DC bias withstand, harmonic withstand (% THD), dielectric clearances for DC and impulse |
|
Tap-Changer |
OLTC with extended range (up to ±25%), adaptive voltage control |
|
Impedance |
% impedance (e.g., 15–18%), leakage reactance |
|
Losses & Heating |
Losses under harmonic-rich conditions, hotspot rise under composite loads |
|
Cooling System |
OFAF or ODAF with oil flow management system |
|
Testing |
Dual-frequency tests, polarity reversal, lightning impulse, switching impulse, chopped wave |
|
Accessories |
Valve bushings, smoothing reactor terminals, shielding devices, external tap boxes |
| Category | Recommended Technical Fields |
|---|---|
|
Electrical Ratings |
HV/rectifier side voltage, MVA rating, phase configuration, connection group |
|
DC Output Spec |
Secondary voltage, max DC current (e.g., 44,000 A), number of pulse (6/12-pulse) |
|
Short Circuit Design |
Dynamic forces, bracing, %Z (typ. 7–9%), short-circuit duration withstand |
|
Cooling |
ONAN/ODAF with overload profile, forced oil flow control |
|
Losses & Overload |
Total losses, overload curves (15 min, 30 min), transient thermal limits |
|
Tap-Changer |
Off-load or on-load tapper, especially for arc voltage regulation |
|
Testing |
Impulse withstand, thermal cycle, core hot spot monitoring |
|
Accessories |
Current transformers, temperature alarms, explosion vent |
| Category | Recommended Technical Fields |
|---|---|
|
Voltage Ratings |
Nominal voltage, phase (1Φ/3Φ), insulation class |
|
MVAr Capacity |
Rated reactive power, core/reactor type (gapped core, air-core, iron-core) |
|
Impedance & Inductance |
Nominal inductance, total loss (core + stray), Q factor |
|
Losses |
No-load loss < 0.5%, stray losses, load factor impact |
|
Cooling |
Natural air (dry), ONAN, ONAF |
|
Noise Level |
≤ 65–75 dBA |
|
Impulse Ratings |
LIWL, PF withstands |
|
Mounting |
Skid type or platform-based |
|
Testing |
Magnetic balance, induced voltage, high voltage withstand |
| Category | Recommended Technical Fields |
|---|---|
|
Electrical Ratings |
Rated voltage, class, number of windings, insulation class |
|
Insulation System |
Vacuum cast epoxy resin, class F/H, PD-free at 1.1 x rated voltage |
|
Cooling |
AN, AF; natural/forced air cooling, with vented enclosure |
|
Losses |
Core loss, load loss, thermal rise (max 100 °C) |
|
Impedance |
4–8% depending on kVA class |
|
Protection Class |
IP00, IP23, or up to IP44 for special installations |
|
Testing |
Induced voltage, heat run, lightning impulse, PD measurement |
|
Accessories |
Temperature sensors, protection relays, enclosure panels |
| Category | Recommended Technical Fields |
|---|---|
|
Electrical Ratings |
Input/output voltage, Vv/Scott-T wiring scheme, KVA rating |
|
Tap-Changer |
Off-load or on-load ±2×2.5%, automatic tap position logic |
|
Load Balancing |
Phase load equalization curve, impedance per leg |
|
Thermal & Overload |
Thermal withstand under cyclic loading, ambient temperature profile |
|
Short Circuit Strength |
Fault withstand, electromagnetic design, bracing details |
|
Protection & Monitoring |
Bushing sensors, Buchholz relay, pressure relief, oil temp gauge |
|
Testing |
Railway-specific: vibration endurance, high surge withstand, harmonics |
