11kV Electric Distribution Transformer
Rated Power: Up to 2500KVA
Rated Voltage: 11/0.4kV
Rated Frequency: 50HZ, 60HZ
Phase: 3 phase
Tap Range: ±5%, ±2×2.5%
Notes: The S11 series11kV electric distribution transformer is customizable in capacity, voltage combination, impedance voltage, vector group, and cooling/protection methods to meet diverse distribution and industrial requirements.
Zhejiang Tianrun Electric Co., Ltd. is one of the leading manufacturers and suppliers of 11kv electric distribution transformer in China. We are committed to providing high quality customized products with competitive price. We warmly welcome you to buy bulk advanced 11kv electric distribution transformer from our factory. Also, quotation is available.
Product Overview
The 11kV power transformer is a three-phase oil-immersed distribution transformer (30–2,500 kVA, 6–35 kV / 0.4 kV, larger ratings on request) with a cold-rolled silicon steel core, oxygen-free copper windings, oil-paper insulation and a hermetically sealed corrugated tank. Built to IEC 60076, GB/T 6451, GB/T 1094 and GB 20052; IEEE C57.12.00 available for export.
Oil serves as both dielectric and coolant via natural circulation (ONAN); ONAF cooling and on-load tap changers are optional. Rated for −25 to +40 °C and altitude ≤1,000 m; suitable for outdoor or ventilated indoor substations, not for explosive/corrosive environments. Mineral-oil units require fire separation and an oil pit; ester oil available. Losses meet S11 level.
Advantages & Features
Strong Load Tolerance & Wide Operating
Adaptability Robust electrical design delivers stable performance under fluctuating loads, frequent start-stop cycles and short-term impact loads. It tolerates average grid conditions and regular voltage fluctuations, ensuring long service life and extremely low failure rates.
Cost-Effective for International Projects
Optimized material structure and streamlined configurations - while fully compliant with international standards - effectively cut upfront investment. It fits well for bulk overseas procurement, civil distribution networks and budget-controlled small-to-medium retrofit projects.
Robust Construction, Low Maintenance
Rigid structure withstands vibration and impact for long-term reliable outdoor operation. No complex professional maintenance is required, and it supports unattended operation in remote locations.
Meaning of Product Model
Note: More technical parameters of the transformer can not be reflected in the model, more information is required to check the technical parameters.
Product Parameter
Oil-immersed Transformer S11 Series Product Parameter Table
|
10kV S11, S11-M Series Technical Parameter of Oil Immersed Distribution Transformers |
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|
Rated capacity (kVA) |
Combined voltage (KV) |
Connect group |
Load loss (kW) |
No-load current (%) |
Impedance voltage (%) |
Weight (kg) |
S9 Dimension (mm) (L×W×H) |
||||
|
High- voltage |
Low- voltage |
No-load |
Load (75℃) |
Machine weight |
Oil weight |
Total weight |
|||||
|
30 |
11 |
0.4 |
Yyno |
0.10 |
0.60 |
2.1 |
4% |
185 |
70 |
325 |
750×490×970 |
|
50 |
0.13 |
0.87 |
2.0 |
255 |
85 |
420 |
770×550×1030 |
||||
|
63 |
0.15 |
1.04 |
1.9 |
280 |
95 |
480 |
800×600×1040 |
||||
|
80 |
0.18 |
1.25 |
1.8 |
320 |
100 |
535 |
810×680×1060 |
||||
|
100 |
0.20 |
1.50 |
1.6 |
380 |
110 |
615 |
820×680×1100 |
||||
|
125 |
0.24 |
1.80 |
1.5 |
440 |
115 |
690 |
1070×700×1150 |
||||
|
160 |
0.28 |
2.20 |
1.4 |
510 |
130 |
800 |
1120×700×1220 |
||||
|
200 |
0.34 |
2.60 |
1.3 |
610 |
150 |
935 |
1160×720×1255 |
||||
|
250 |
0.40 |
3.05 |
1.2 |
720 |
190 |
110 |
1200×760×1310 |
||||
|
315 |
0.48 |
3.65 |
1.1 |
835 |
200 |
1270 |
1210×780×1320 |
||||
|
400 |
0.57 |
4.30 |
1.0 |
1010 |
240 |
1540 |
1340×880×1360 |
||||
|
500 |
0.68 |
5.10 |
1.0 |
1170 |
260 |
1765 |
1360×890×1410 |
||||
|
630 |
0.81 |
6.20 |
0.9 |
4.5% |
1375 |
320 |
2095 |
1560×1020×1430 |
|||
|
800 |
0.98 |
7.50 |
0.8 |
1620 |
365 |
2470 |
1640×1060×1500 |
||||
|
1000 |
1.15 |
10.30 |
0.7 |
1780 |
405 |
2780 |
1720×1160×1540 |
||||
|
1250 |
1.36 |
12.80 |
0.6 |
2065 |
560 |
3395 |
1790×1190×1740 |
||||
|
1600 |
1.64 |
14.50 |
0.6 |
2470 |
650 |
3990 |
1830×1210×1850 |
||||
|
2000 |
1.96 |
19.80 |
0.6 |
2700 |
695 |
4460 |
2190×1900×1950 |
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|
2500 |
2.31 |
23.00 |
0.6 |
3230 |
870 |
5330 |
2240×1940×1980 |
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|
Note: High-voltage tapping range: ±5% or ±2×2.5%; Frequency: 50Hz. |
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Product Structure Features
Building on conventional architecture and mature proven technology, our transformer features three key design optimizations: helical windings with longitudinal oil ducts for superior internal heat dissipation, upgraded winding end-face supports for enhanced short-circuit withstand strength, and new lifting and core positioning structures for reliable long-haul transportation and steady in-service performance.
Operating Environmental Conditions
|
Name |
Unit |
Standard technical parameters |
|
|
Ambient temperature |
Maximum daily temperature |
℃ |
45 |
|
Minimum daily temperature |
-25 |
||
|
Maximum diurnal temp range |
K |
25 |
|
|
Average temp in hottest month |
℃ |
30 |
|
|
Maximum annual average temp |
20 |
||
|
Humidity |
Average daily relative humidity |
% |
≤95 |
|
Average monthly relative humidity |
≤90 |
||
|
Height |
m |
≤1000 |
|
|
Intensity of solar radiation |
W/cm2 |
0.1 |
|
|
Maximum ice thickness |
mm |
20 |
|
|
The average maximum wind speed at 10m above the ground for 10 minutes |
m/s |
35 |
|
|
Seismic fortification capability |
Ground level acceleration |
m/s2 |
2 |
|
Safety factor for three cycles of Resonance |
≥1.67 |
||
|
Installation site |
Outdoors |
||
|
Atmospheric corrosivity levels (C1/C2/C3/C4/C5/CX) |
Confirm with project unit before supply |
||
|
Way to install |
Ground installation (platform installation) |
||
Product Application
The S11-M is a cost-effective mainstream model for global general overseas use. It features wide compatibility and fits most conventional power distribution environments without harsh operation restrictions.
- Civil power scenarios: Overseas suburban & rural residential areas, municipal public power distribution, and old substation renovation projects.
- Commercial & industrial scenarios: Small and medium processing plants, light industrial workshops, retail zones and power supporting systems for agricultural markets.
- Engineering power scenarios: Outdoor construction sites, temporary power supply for roads & bridges, power systems for remote mines and rural irrigation facilities.
This model fits basic distribution projects with mild load fluctuations and non-strict energy-saving & noise standards, serving as the top option for large-volume, cost-controlled overseas civil infrastructure projects.
Product Usage Case
★ Case: Tianrun Electric Successfully Delivers CE-certified Transformer to Laos Grid Modernization Project
Zhejiang Tianrun delivered S11-M sealed oil transformers and smart OLTCs for northern Laos' power upgrade, with capacities of 8000kVA, 2000kVA, 1000kVA and 500kVA to stabilize grids and boost local industry.
All S11-M units pass 72-hour IEC 60076 & CE full tests with complete reports and factory warranties. Customized for Laos' tropical climate, the 8000kVA S11-M model has 30% stronger short-circuit resistance and works at -25°C~+55°C. Its matched OLTC achieves ±15% voltage regulation in under 3 seconds, while anti-corrosion coating, moisture-proof breathers and tropical insulation extend service life. All equipment is properly packaged and truck-shipped safely.
Founded in 2003, this national high-tech enterprise holds CE, ISO 9001 and IEEE certifications. With 20+ years manufacturing S11-M transformers, dry-type transformers, OLTCs and switchgears, it has exported over 2,000 units to 50+ countries across 12 Belt and Road regions. This Laos order reinforces Tianrun's standing as a trusted supplier of high-performance S11-M transformers in Southeast Asia.
Proccess of Transformer
1-Wire‑wound winding of transfomer
2-Foil‑wound winding of transfomer
3-Vacuum casting of transformer
4-Epoxy resin casting of transfomer
5-Coil assembling over core
6-HV porcelain bushings of oil immersed transformer
7-Lead insulation taping and welding of transfomer
8-Vacuum oil filling of transformer
9-Tank sealing of transformer
Testing of Transformer
1-Measurement of winding resistance testing of transformer
2-Measurement of voltage ratio and check of phase displacement testing of transformer
3-Separate‑source AC withstand voltage testing of transformer
4-Measurement of no‑load loss and no‑load current of transformer
5-Measurement of short‑circuit impedance and load loss of transformer
6-No load loss and no load current testing of transformer
7-Temperature‑rise test of transformer
8-Partial‑discharge measurement of transformer
9-Winding ressitant and voltage ratio testing of transformer
FAQ
Q1: What are the typical capacity and voltage ranges of the S11?
Capacity: 30–2,500 kVA (standard distribution), extendable to larger ratings. HV: 6, 10, 11, 15, 20, 35 kV. LV: mainly 0.4 kV (400 V), other voltages customizable.
Q2: What is the difference between S11, S9 and S13?
The core difference is the no-load loss (iron loss) energy-efficiency class: S13 has approx. 20–25% lower no-load loss than S11, and S11 is approx. 20–30% lower than S9. S11 is the mainstream cost-effective choice; S13/S20 suit higher energy-saving requirements.
Q3: What customization options are available for the S11?
Capacity, voltage combination, vector group (Dyn11/Yyn0), impedance voltage, tap changer (off-circuit/on-load), cooling (ONAN/ONAF), IP rating (IP00–IP44), termination method, oil type (mineral/natural ester), enclosure material and color - all customizable.
Q4: What installation environments are suitable for the S11?
Outdoor standalone substations, pole-mounted, distribution rooms, industrial plants, residential areas. Ambient temp: -25°C to +40°C; altitude ≤1,000 m (derating or special design required above). Not suitable for flammable, explosive, heavily polluted or corrosive environments.
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