11kV 500kVA Oil Immersed Transformer
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This 500KVA transformer was delivered to Egypt in 2022. the rated power of the transformer is 500 KVA.
Standards: BS EN 60076
Rated Power: 500kVA
Rated Frequency: 50 Hz
Rated High Voltage: 11kV
HV Tapping Range: +7½, -5 %
Tap Switch: Off circuit
Rated Low Voltage: 415V
Tap Steps: 5 x 2½ %
Rated Current: 695.60 A
Cooling Method: ONAN
Thermal Class: A (105°C)
Coolant: Mineral Oil
Insulation Level : Li75.Ac28 / Ac3
Vector Group: Dyn11
Core Material: Aluminium
Winding Material: CRGO
Temperature Rise, Oil/Wdg: 60 / 65°C
Load Loss @ 75°C: 3900 W
No Load Loss: 459 W
Impedance: 4.75%
500 kVA 11kV/0.4kV Oil-Filled Electrical Distribution Transformer Technical Specs
| No. | Item | Specification | Remark |
|---|---|---|---|
| 1 | Power Rating | 500 kVA | Standard range: 100 kVA – 2500 kVA oil-immersed distribution transformers |
| 2 | Primary Voltage | 11 kV (Delta) | Also available: 6.6 kV, 10.5 kV, 13.2 kV, 15 kV, 22 kV |
| 3 | Secondary Voltage | 0.4 kV (Wye grounded) | Options: 0.415 kV, 0.33 kV, 0.208 kV based on local standards |
| 4 | Phase | Three-phase | Suitable for utility, commercial, and municipal grid use |
| 5 | Cooling Type | ONAN (Oil Natural Air Natural) | Efficient passive cooling for urban or rural installations |
| 6 | Core Material | CRGO silicon steel | Minimizes iron losses and improves magnetic performance |
| 7 | Insulation Fluid | Electrical grade mineral oil | IEEE/IEC-compliant with excellent thermal stability |
| 8 | Temperature Rise | 55°C / 65°C options | Compliant with North American and European requirements |
| 9 | Enclosure Type | Outdoor sealed tank, IP44/IP54 | Rust-resistant, anti-corrosion coating, tamper-proof design |
| 10 | Standards | IEC 60076, ANSI C57, CSA, EN 50588 | Meets EU & North American grid compliance standards |
| 11 | Certifications | CE, UL, CSA, cUL, RoHS, ISO | Third-party testing for safety and performance |
| 12 | Connection Type | Delta – Wye grounded (standard) | Custom configurations: Delta-Delta, Wye-Wye, etc. |
| 13 | Applications | Industrial parks, data centers, local substations | Widely used in Canada, UK, Germany, Spain, Portugal |
| 14 | Protection Devices | Oil level gauge, pressure valve, temp gauge | Optional: surge arresters, drain valve, PRV |
| 15 | Dimensions & Weight | Customizable | Weight ~1200–1500 kg depending on spec |
| 16 | Energy Efficiency | DOE 2016 & EU Eco Design-compliant | Reduces operating losses and carbon emissions |
| 17 | Installation Method | Pad-mounted or pole-mounted | Includes lifting lugs and skid base for transport |
| 18 | Ambient Temperature Range | -25°C to +45°C | Arctic-ready versions available for -40°C |
| 19 | Total Transformer Loss | ≤1.6% @ full load | Designed for long-term low-cost operation |
| 20 | No-Load Loss | ≤ 0.3% of rated capacity | Helps improve energy savings in idle conditions |
| 21 | Load Loss | ≤ 1.25% of rated power | Optimized for continuous load distribution |
| 22 | Impedance | 5.5% typical | Custom range: 5% – 7% depending on design |
| 23 | Short-Circuit Strength | Withstands 25 kA for 2 sec | Mechanical integrity under fault conditions |
| 24 | Insulation Class | Class A (105°C) | Class F or B available for higher performance |
| 25 | Windings Material | Copper (standard) or Aluminum | Copper preferred for lower losses and longer life |
| 26 | Tap Changer | ±2 x 2.5% Off-Circuit Tap Changer | OLTC available for automatic voltage adjustment |
| 27 | Bushings | Porcelain per ANSI standards | Polymeric bushings available for severe climates |
| 28 | Cooling Oil Volume | Approx. 350–400 liters | Depends on final tank size and rating |
| 29 | Transformer Lifespan | 25–30 years average | Designed for high-reliability utility applications |
| 30 | Noise Level | ≤ 58 dB at 1 meter | Urban-friendly acoustic design |
| 31 | Warranty | 2 years standard | Optional 5-year extended support |
| 32 | Delivery Time | 30–45 days | Fast delivery via sea or air freight |
| 33 | Custom Lead Time | 60–75 days | Tailored builds per project specs |
| 34 | Price Range | Contact for quote | Based on copper content, specs, and certification level |
| 35 | Country of Origin | China (Energy Transformer Factory) | CE/UL/CSA-certified direct manufacturing supply |
500 kVA 11kV/0.4kV Oil-Filled Electrical Distribution Transformer – Factory Direct Supply
The 500 kVA electrical distribution transformer (oil-filled, 3-phase) is engineered to deliver dependable voltage conversion in commercial, industrial, and public utility environments across North America and Europe. Rated at 500 kVA, this medium voltage transformer supports reliable 11kV to 0.4kV step-down operation, ideal for low-voltage load centers in municipal grids, logistics parks, residential substations, and manufacturing plants.
The unit features a robust Delta-connected 11kV primary winding and grounded Wye 0.4kV secondary output. Custom voltage configurations-such as 10.5kV/415V or 12kV/400V-can be provided to meet local distribution code requirements across the United States, UK, Canada, Germany, and France. The core utilizes cold-rolled grain-oriented silicon steel for minimized core losses, while high-conductivity copper windings ensure low-temperature rise and optimized short-circuit resistance.
Encased in a weatherproof, hermetically sealed steel tank, the 500 kVA oil-immersed transformer is filled with degassed mineral insulating oil and designed for indoor and outdoor installation. The standard ONAN cooling system supports quiet, maintenance-friendly thermal management, with optional radiator extensions available for high ambient environments.
In 2022, multiple units of this 500 kVA distribution transformer were installed in a Canadian school district to modernize outdated utility substations. With smart load balancing and consistent voltage regulation during peak winter demand, they've demonstrated stable performance and improved energy efficiency under IEC and ANSI operating conditions.
Power Rating: 500 kVA (Typical range: 100 kVA to 2500 kVA)
Primary Voltage: 11 kV (Delta configuration, available range: 6.6 kV to 33 kV)
Secondary Voltage: 400/230 V (Wye, grounded neutral, typical LV range: 208Y/120 V to 690 V)
Connection Options: Delta–Wye (grounded), Wye–Wye, Delta–Delta, Wye–Delta (customizable per region and grid requirements)
Phase: Three-phase, 50/60 Hz compatible
Cooling Type: Oil-immersed, ONAN (natural oil and air cooling for continuous duty cycles)
Standards Compliance: IEC 60076, ANSI C57, IEEE, EN 50588-1, DOE Tier 2 compliant
Certifications: CE Marked, UL Listed, CSA Certified, ISO 9001, SGS Approved
Enclosure: Weatherproof, sealed steel tank with rust-resistant finish; designed for both pad-mount and indoor switchgear installation
Applications: Suited for commercial electrical distribution, industrial load centers, solar and wind interconnection, shopping malls, campuses, utility substations, and critical infrastructure in the US, Canada, UK, Germany, Spain, France, Netherlands, Australia, and Portugal.
Introduction of Oil Immersed Transformer
oil immersed transformeroffering the choice between the Yyn0 or Dyn11 vector group configurations across a wide power range from 30 kVA to 31500 kVA. These transformers are engineered to deliver exceptional performance, efficiency, and reliability in diverse industrial and commercial settings.
The Yyn0 vector group configuration provides a specific phase shift angle, ensuring precise voltage regulation and stability in power distribution networks. On the other hand, the Dyn11 configuration offers an alternative phase shift angle, catering to varying operational requirements with flexibility and adaptability.
One of the key advantages of our transformers lies in their superior energy efficiency, reducing power losses and operational costs over the long term. With advanced design features and high-quality materials, these transformers are built to withstand demanding operating conditions and deliver consistent performance.
Oil-immersed transformers can be widely used in high-rise buildings, commercial centers, subways, airports, stations, industrial and mining enterprises, drilling platforms, and oil production platforms. They are especially suitable for use in places with high fire protection requirements and harsh environments such as flammable and explosive materials. They can also be used for power and lighting in residential areas, commercial streets, industrial and mining enterprises, and rural areas.
Product Parameter
|
Capacity(KVA) |
No-load Loss(W) |
Load Loss |
Impedance Voltage(%) |
No-load Current(%) |
Vector Group | Extend Connection | |
| Dyn11/Yzn11 | Yyno | ||||||
| 30 | 100 | 600 | 630 | 4.0 | 2.1 | Yyn0 OR Dyn11 |
±2*2.5% Or±5% |
| 50 | 130 | 870 | 910 | 2 | |||
| 63 | 150 | 1090 | 1040 | 1.9 | |||
| 80 | 180 | 1310 | 1250 | 1.8 | |||
| 100 | 200 | 1580 | 1500 | 1.6 | |||
| 125 | 240 | 1890 | 1800 | 1.5 | |||
| 160 | 280 | 2310 | 2200 | 1.4 | |||
| 200 | 340 | 2730 | 2600 | 1.3 | |||
| 250 | 400 | 3200 | 3050 | 1.2 | |||
| 315 | 480 | 3830 | 3650 | 1.1 | |||
| 400 | 570 | 4520 | 4300 | 1.0 | |||
| 500 | 680 | 5410 | 5150 | 1 | |||
| 630 | 810 | 6200 | 4.5 | 0.9 | |||
| 800 | 980 | 7500 | 0.8 | ||||
| 1000 | 1150 | 10300 | 0.7 | ||||
| 1250 | 1360 | 12000 | 0.6 | ||||
| 1600 | 1640 | 14500 | 0.6 | ||||
| 2000 | 1940 | 18300 | 5.0 | ||||
| 2500 | 2290 | 21200 | |||||
| S11 35kv Three-phase Dual-winding No-load Voltage Regulation Transformer spec | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Rated Capacity (KVA) | Voltage Combination | Connection Group Symbol | No-load Loss (W) | Load Loss (W) | No-load Current (%) | Impedance Voltage (%) | L*W*H(mm) | Active parts Weight (kg) * Oil Weight (kg) | Total Weight (kg) | ||
| High Voltage (KV) | Tapping Range of High Voltage | Low Voltage (KV) | |||||||||
| 630 | 35 | ±2×2.5% 士5% | 3.15 6.3 10.5 | Ydl1 | 830 | 7860 | 0.65 | 6.5 | 2400*1700*221 | 2210*900 | 3250 |
| 800 | 980 | 9400 | 0.65 | 2500*1850*239 | 2350*1030 | 3500 | |||||
| 1000 | 1150 | 11500 | 0.65 | 2700*1950*251 | 2490*1180 | 3860 | |||||
| 1250 | 1400 | 13900 | 0.55 | 2900*2050*263 | 2600*1350 | 4350 | |||||
| 1600 | 1690 | 16600 | 0.45 | 3050*2130*275 | 2810*1580 | 4855 | |||||
| 2000 | 2170 | 18300 | 0.45 | 3105*2195*280 | 2800*1800 | 5300 | |||||
| 2500 | 2560 | 19600 | 0.45 | 3150*2535*298 | 3525*2060 | 7665 | |||||
| 3150 | 35-38.5 | ±2×2.5% 土5% | 3.15 6.3 10.5 | 3040 | 23000 | 0.45 | 7 | 3920*2725*284 | 3950*2205 | 8565 | |
| 4000 | 3610 | 27300 | 0.45 | 3310*2915*307 | 4825*2560 | 10115 | |||||
| 5000 | 4320 | 31300 | 0.45 | 3480*3020*314 | 5700*2635 | 11305 | |||||
| 6300 | 5240 | 35000 | 0.45 | 8 | 3590*2905*321 | 7120*3240 | 13510 | ||||
| 8000 | 35-38.5 | ±2×2.5% | 3.15 3.3 6.3 6.6 10.5 | Ynd11 | 7200 | 38400 | 0.35 | 4070*3050*359 | 8875*3840 | 16690 | |
| 10000 | 8700 | 45300 | 0.35 | 4106*2795*365 | 10305*3600 | 17690 | |||||
| 12500 | 1000 | 53800 | 0.3 | 4570*3010*384 | 12830*4310 | 20990 | |||||
| 16000 | 1210 | 65800 | 0.3 | 5235*3295*461 | 16010*6650 | 27660 | |||||
| 20000 | 1440 | 79500 | 0.3 | 5360*3415*466 | 18820*7600 | 32170 | |||||
| 25000 | 1700 | 94000 | 0.25 | 10 | 5830*3810*486 | 22360*9800 | 42600 | ||||
| 31500 | 2020 | 112000 | 0.25 | 6290*4290*526 | 25110*12010 | 49960 | |||||
| S11 35kv No-load Voltage Regulation Transformer Spec | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Rated Capacity (KVA) | Voltage Combination | No-load Loss (W) | Load Loss (W) | Impedance Voltage(%) | No-load Current (%) | L*W*H(mm) | Active parts Weight (kg) Oil Weight (kg) | Total Weight (kg) | ||
| High Voltage (KV) | Tapping Range of High Voltage | Low Voltage (KV) | ||||||||
| 50 | 35 38.5 | ±5% ±2×2.5% | 0.4 | 160 | 1200/1140 | 6.5 | 1.3 | 1195*935*1825 | 300*330 | 860 |
| 100 | 230 | 2010/1910 | 1.1 | 1200*995*1935 | 470*383 | 1130 | ||||
| 125 | 270 | 2370/2260 | 1.1 | 1235*940*1955 | 550*465 | 1335 | ||||
| 160 | 280 | 2820/2680 | 1 | 1285*895*1950 | 580*485 | 1475 | ||||
| 200 | 340 | 3320/3160 | 1 | 1310*1150*1985 | 680*595 | 1755 | ||||
| 250 | 400 | 3950/3760 | 0.95 | 1450*1090*2010 | 860*650 | 2000 | ||||
| 315 | 480 | 4750/4530 | 0.95 | 1930*1065*2320 | 980*765 | 2290 | ||||
| 400 | 580 | 5740/5470 | 0.85 | 1850*1165*2015 | 1170*885 | 2725 | ||||
| 500 | 680 | 6910/6580 | 0.85 | 2045*1205*2415 | 1340*960 | 3090 | ||||
| 630 | 830 | 7860 | 0.65 | 2085*1240*2515 | 1550*895 | 3810 | ||||
| 800 | 980 | 9400 | 0.65 | 2305*1615*2685 | 1990*1030 | 4510 | ||||
| 1000 | 1150 | 11500 | 0.65 | 2545*1540*2590 | 2415*1475 | 5055 | ||||
| 1250 | 1400 | 13900 | 0.6 | 2495*2010*2675 | 2480*1405 | 5290 | ||||
| 1600 | 1690 | 16600 | 0.6 | 2680*2100*2770 | 2600*1490 | 5450 | ||||
| 2000 | 1990 | 19700 | 0.55 | 2790*2180*2860 | 2720*1590 | 5600 | ||||
| 2500 | 2360 | 23200 | 0.55 | 2900*2290*2980 | 2830*1720 | 5760 | ||||
Drawing
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