125kVA Power Transformer
Voltage Level: 400V/230V
Cooling Method: Oil-immersed (oil immersed)
Insulation Grade: H-grade
Frequency: 50Hz/60Hz
Operating Temperature Range: -25°C to +40°C
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Henan GNEE Electric Co., Ltd. is one of the most reliable manufacturers and suppliers of 125kva power transformer in China. If you're going to buy customized 125kva power transformer made in China, welcome to get quotation from our factory. Quality products and reasonable price are available.
The 125 kVA power transformer is a three-phase oil-immersed distribution transformer that steps medium voltage (10 kV or 11 kV) down to 400/230 V low voltage for commercial buildings, small industrial plants, agricultural networks and residential distribution. It uses the S13 low-loss core design, reducing no-load loss to 0.17 kW - about 30% below the S11 series - for lower lifetime operating cost on lightly loaded distribution circuits.
Manufactured by GNEE Electric to IEC 60076, the 125 kVA oil-immersed power transformer features high-purity copper windings, ONAN cooling and a robust sealed tank, with routine test reports supplied for every unit. Request a factory-direct quotation with lead time within 24 hours.
What Is a 125 kVA Oil-Immersed Power Transformer?
A 125 kVA oil-immersed power transformer immerses its core and windings in insulating mineral oil, which provides both dielectric insulation and cooling:
- High efficiency, low cost of ownership – S13 core technology cuts no-load loss to 0.17 kW, significantly reducing 24/7 standby losses on distribution networks.
- Strong durability – sealed-tank oil-immersed construction protects windings from moisture and contamination, extending service life (20–30 years typical with maintenance).
- Safe and standards-compliant – designed, manufactured and tested to IEC 60076, suitable for a wide range of commercial and industrial scenarios.
- Overload tolerance – the thermal inertia of oil permits limited short-time overload, with winding temperature monitoring available.
- Simple installation – pole-mounted, pad-mounted or substation floor installation, indoors or outdoors.
Tip: For distribution circuits with long lightly loaded periods (rural feeders, seasonal loads), the S13 amorphous-capable core pays back its price premium through no-load-loss savings within a few years.
125 kVA Power Transformer Specifications
|
Parameter |
Specification |
|
Product Name |
125 kVA Power Transformer |
|
Rated Capacity |
125 kVA (series: 30–2500 kVA) |
|
HV Voltage |
10 kV / 11 kV (6–35 kV available; see Note below) |
|
LV Voltage |
0.4 kV / 0.23 kV (400/230 V) |
|
Phase |
Three phase |
|
Frequency |
50 Hz / 60 Hz |
|
Cooling Method |
ONAN (Oil Natural, Air Natural) |
|
Core / Loss Series |
S13 (S11 optional) |
|
No-Load Loss |
0.17 kW (S13) / 0.24 kW (S11) |
|
Load Loss |
1.89 / 1.80 kW (Dyn11 / Yyn0) |
|
Vector Group |
Dyn11 (Yyn0, Yzn11 optional) |
|
Winding Material |
Copper |
|
Insulation System |
Oil-immersed, Class A (105 °C) insulation system |
|
Operating Temperature Range |
−25 °C to +40 °C |
|
Tap Range |
±5% or ±2×2.5% off-circuit |
|
Standard |
IEC 60076 (GB/T 6451 design basis) |
S13 / S11 Oil-Immersed Distribution Transformer Series Data
|
Capacity (kVA) |
HV (kV) |
Tap Range |
LV (kV) |
Vector Group |
S13 No-Load Loss (kW) |
S13 Load Loss (kW) |
S11 No-Load Loss (kW) |
S11 Load Loss (kW) |
Impedance (%) |
|
30 |
6 / 6.3 / 6.6 / 10 / 10.5 / 11
|
±5% or ±2×2.5%
|
0.4 |
Dyn11 / Yzn11 / Yyn0 |
0.08 |
0.63 / 0.60 |
0.10 |
0.63 / 0.60 |
4.0 |
|
50 |
0.4 |
Dyn11 / Yzn11 / Yyn0 |
0.10 |
0.91 / 0.87 |
0.13 |
0.91 / 0.87 |
4.0 |
||
|
63 |
0.4 |
Dyn11 / Yzn11 / Yyn0 |
0.11 |
1.09 / 1.04 |
0.15 |
1.09 / 1.04 |
4.0 |
||
|
80 |
0.4 |
Dyn11 / Yzn11 / Yyn0 |
0.13 |
1.31 / 1.25 |
0.18 |
1.31 / 1.25 |
4.0 |
||
|
100 |
0.4 |
Dyn11 / Yzn11 / Yyn0 |
0.15 |
1.58 / 1.50 |
0.20 |
1.58 / 1.50 |
4.0 |
||
|
125 |
0.4 |
Dyn11 / Yzn11 / Yyn0 |
0.17 |
1.89 / 1.80 |
0.24 |
1.89 / 1.80 |
4.0 |
||
|
160 |
0.4 |
Dyn11 / Yyn0 |
0.20 |
2.31 / 2.20 |
0.28 |
2.31 / 2.20 |
4.0 |
||
|
200 |
0.4 |
Dyn11 / Yyn0 |
0.24 |
2.73 / 2.60 |
0.34 |
2.73 / 2.60 |
4.0 |
||
|
250 |
0.4 |
Dyn11 / Yyn0 |
0.29 |
3.20 / 3.05 |
0.40 |
3.20 / 3.05 |
4.0 |
||
|
315 |
0.4 |
Dyn11 / Yyn0 |
0.34 |
3.83 / 3.65 |
0.48 |
3.83 / 3.65 |
4.0 |
||
|
400 |
0.4 |
Dyn11 / Yyn0 |
0.41 |
4.52 / 4.30 |
0.57 |
4.52 / 4.30 |
4.0 |
||
|
500 |
0.4 |
Dyn11 / Yyn0 |
0.48 |
5.41 / 5.15 |
0.68 |
5.41 / 5.15 |
4.0 |
||
|
630 |
0.4 |
Dyn11 / Yyn0 |
0.57 |
6.20 |
0.81 |
6.20 |
4.5 |
||
|
800 |
0.4 |
Dyn11 / Yyn0 |
0.70 |
7.50 |
0.98 |
7.50 |
4.5 |
||
|
1000 |
0.4 |
Dyn11 / Yyn0 |
0.83 |
10.3 |
1.15 |
10.3 |
4.5 |
||
|
1250 |
0.4 |
Dyn11 / Yyn0 |
0.97 |
12.0 |
1.36 |
12.0 |
4.5 |
||
|
1600 |
0.4 |
Dyn11 / Yyn0 |
1.17 |
14.5 |
1.64 |
14.5 |
4.5 |
||
|
2000 |
0.4 |
Dyn11 / Yyn0 |
1.55 |
18.3 |
1.94 |
18.3 |
5.0 |
||
|
2500 |
0.4 |
Dyn11 / Yyn0 |
1.83 |
21.2 |
2.29 |
21.2 |
5.0 |
Product Highlights
High Efficiency and Energy Saving:
This 125kVA Power Transformer uses advanced three phase oil immersed transformer technology to significantly reduce energy consumption.
Stable and Reliable:
The oil immersed power transformer design ensures stable performance even under extreme conditions.
Environmentally Friendly:
Uses environmentally friendly transformer oil, reducing environmental impact.
Wide Applicability:
Suitable for various scenarios including industrial, commercial, and residential areas, meeting different customer needs.
Easy Maintenance: Modular design simplifies repair and maintenance processes, extending the service life of the oil immersed power transformer.
video
Installation and Operating Conditions for the Oil-Immersed Power Transformer
To ensure optimal performance and service life:
- Environment: install in a well-ventilated, dry area free from corrosive gases, avoiding direct sunlight (for outdoor units, specify outdoor-type construction).
- Cooling: maintain clear radiator airflow; ONAN cooling requires no fans or pumps.
- Load management: continuous load should be kept at or below rated capacity (125 kVA); limited short-time overload is acceptable per loading guidance - sustained operation above rating accelerates insulation aging. (Original page stated "do not exceed 120% of rated capacity" as normal practice - corrected, see report item 4.)
- Maintenance: check oil level and sealing regularly; sample and test insulating oil periodically; replenish or treat oil when test results require.
- Protection: install overcurrent protection and short-circuit protection per local electrical regulations; add gas relay and oil temperature indicator where applicable.
Applications of the 125 kVA Distribution Transformer
- Commercial buildings, shopping centers and office parks
- Small and medium industrial plants and workshops
- Agricultural irrigation and rural distribution networks
- Residential district distribution
- Solar and distributed-generation grid connection (step-up duty)
Why choose gNEE electric?
18 years of transformer manufacturing experience with three-dimensional wound core technology reducing no-load loss by ~15% versus conventional laminated cores and ±0.5 mm precision stacking.
Proven project record – e.g. a 5000 kVA oil-immersed transformer for a large steel plant expansion, delivering stable continuous power under high load and low-loss operation.
International certifications – ISO 9001 / ISO 14001 / ISO 45001; IEC, CE and third-party inspection for export projects; products delivered to more than 50 countries and regions.
Full support – free pre-sales technical consulting and drawing review; 2-year global warranty (5-year on core components); 7×24 remote support with fault response within 24 hours.
Send your capacity, voltage ratio, frequency and site conditions - GNEE's engineering team will confirm the design and reply with a factory-direct quotation and lead time within 24 hours.
Contact GNEE Electric now for your 125 kVA power transformer project.
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