Power Transformer
Trust in Grid (TIG) Main Transformers / Large Power Transformers
Grid-Level Reliability · EHV Large Capacity · Preferred Choice for Global Energy Infrastructure
Product Portfolio
|
Category |
Specification Range |
Application Scenarios |
|
Power Transformer |
10 MVA - 480 MVA |
Power plant step-up, substation main transformer, grid backbone nodes |
|
EHV Transformer |
66kV - 500kV |
Cross-regional power transmission, national grid backbone networks |
Core Competitive Advantages
🔋 Large Capacity · High Energy Efficiency
|
Parameter |
Trust in Grid Standard |
Industry Advantage |
|
Maximum Capacity |
480 MVA single unit, up to 1000 MVA+ in parallel |
Meets demands of large power plants and UHV stations |
|
Efficiency Class |
Compliant with IEC 60076-1 Ed.3.0 Tier 1 efficiency |
40% reduction in no-load loss, 15% optimization in load loss |
|
Short-circuit Impedance |
Precisely designed (8%-20% adjustable), short-circuit withstand capability ≥25x rated current |
Automatic protection during grid faults, zero damage record |
|
Overload Capacity |
150% rated load for 2 hours continuously |
Handles peak power demand, no standby unit required |
⚡ EHV · Fully Insulated Technology
- Insulation System: Full vacuum oil filling + crepe paper shielding, PD <50pC (far below IEC standard of 100pC)
- Cooling System: ONAN/ONAF/OFAF/ODAF multi-mode intelligent switching, adaptable to tropical/frigid/desert environments
🌍 Global Grid Certifications
|
Certification |
Target Market |
|
IEC 60076 / IEC 60137 |
Global (Europe, Africa, Southeast Asia, Middle East) |
|
IEEE C57.12.00 / C57.12.90 |
North America, South America, Philippines |
|
GOST |
Russia, Central Asian countries |
Technical Parameters (Typical Models)
110kV Main Transformer
|
Parameter |
Specification |
|
Rated Power |
31.5 MVA / 50 MVA / 63 MVA / 100 MVA |
|
Voltage Combination |
110±8×1.25%/38.5±2×2.5%/10.5kV |
|
Vector Group |
YNyn0d11 |
|
No-load Loss |
≤25 kW (@50MVA) |
|
Load Loss |
≤140 kW (@50MVA) |
|
Impedance Voltage |
10.5% / 17.5% / 6.5% (HV-MV/HV-LV/MV-LV) |
|
Cooling Method |
ONAN/ONAF |
220kV EHV Main Transformer
|
Parameter |
Specification |
|
Rated Power |
120 MVA / 180 MVA / 240 MVA |
|
Voltage Combination |
220±8×1.25%/121/10.5kV or 220/115/37kV |
|
Insulation Level |
LI/AC 950/395 kV (HV side) |
|
Cooling Method |
ONAF/OFAF |
|
Special Design |
OLTC, online DGA, intelligent bushings |
330kV EHV Main Transformer ⭐
|
Parameter |
Specification |
|
Rated Power |
180 MVA / 240 MVA / 360 MVA / 450 MVA |
|
Voltage Combination |
330±8×1.25%/121/10.5kV or 330/220/35kV or 330/110/35kV (three-winding) |
|
Vector Group |
YNa0d11 or YNyn0d11 |
|
Insulation Level |
LI/AC 1175/510 kV (HV side) / LI/AC 550/230 kV (MV side) |
|
No-load Loss |
≤85 kW (@240MVA) / ≤120 kW (@360MVA) |
|
Load Loss |
≤480 kW (@240MVA) / ≤680 kW (@360MVA) |
|
Impedance Voltage |
14%-16% (HV-MV) / 24%-26% (HV-LV) / 8%-10% (MV-LV) |
|
Cooling Method |
OFAF / ODAF |
|
Voltage Regulation |
On-Load Tap Changer (MR or ABB brand, 17 or 21 steps) |
|
Special Design |
Online DGA, Fiber Optic Winding Temperature Sensing, Intelligent Bushing Monitoring, Digital Twin System |
|
Transport Mode |
Three-phase integral (≤240MVA) / Single-phase modular (≥360MVA, site assembly) |
Max. Capacity & Voltage in Mass Production for Export: 250MVA / 345kV (Fully Insulated EHV Transformer). This model was manufactured and shipped to the USA in 2025.
500kV UHV Main Transformer (Customized)
- Capacity: 300 MVA - 1000 MVA
- Three-phase integral or single-phase modular (for transport convenience)
- Cooling: ODAF
- Digital Twin Remote Monitoring System
Key Technologies & Quality Control
Manufacturing Capabilities
|
Process |
Trust in Grid Advantage |
|
Core |
Japanese imported ZDKH high-permeability grain-oriented silicon steel, Step-lap joints, 30% reduction in no-load loss |
|
Windings |
Continuously transposed conductors (CTC), short-circuit withstand capability enhanced to 50kA/2s |
|
Insulation |
German imported pressboard, dryness ≤0.5%, dielectric strength ≥40kV/mm |
|
Tank |
Integral welding + helium leak detection, ensuring 30 years of no leakage |
|
Final Assembly |
Fully enclosed dust-free workshop, vacuum ≤0.1mbar, maintained for 24 hours |
Routine Tests (100% Inspected)
- ✅ Winding DC resistance measurement
- ✅ Voltage ratio and vector group verification
- ✅ No-load loss and current measurement
- ✅ Load loss and impedance voltage measurement
- ✅ Power-frequency withstand voltage test (AC)
- ✅ Induced voltage withstand test (IVPD)
- ✅ Lightning impulse test (LI)
- ✅ Partial discharge measurement
- ✅ Temperature rise test (Type test)
- ✅ Dissolved Gas Analysis (DGA)
 |
- ✅ Winding DC resistance measurement |
 |
- ✅ Voltage ratio and vector group verification |
 |
- ✅ No-load loss and current measurement |
 |
- ✅ Load loss and impedance voltage measurement |
 |
- ✅ Power-frequency withstand voltage test (AC) |
 |
- ✅ Induced voltage withstand test (IVPD) |
 |
- ✅ Lightning impulse test (LI) |
 |
- ✅ Partial discharge measurement |
 |
- ✅ Temperature rise test (Type test) |
 |
- ✅ Dissolved Gas Analysis (DGA) |
Foreign Trade Specialized Services (Large Project Customization)
🚢 Logistics and Delivery
|
Item |
Service Content |
|
Transport Solution |
Special heavy-haul vehicles + Ro-Ro vessels, supports CIF/CIP/DAP/DAP terms |
|
Site Assembly |
Ultra-large transformers can be shipped as split units (core + tank, coolers, bushings), on-site guidance by engineers |
|
Installation & Commissioning |
Dispatch senior engineer teams (English/French/Arabic/Russian), provide installation supervision, commissioning, and energization services |
|
Training Services |
On-site training for client O&M teams, issuance of operation and maintenance certificates |
💰 Commercial Support
|
Item |
Policy |
|
Payment Terms |
Accepts L/C at sight for large projects, negotiable milestone-based payments |
|
Financing Support |
Coordination with Sinosure, Export-Import Bank of China preferential loans |
Global Success Stories
|
Country/Region |
Project |
Specification |
Year |
|
Ethiopia |
Addis Ababa Substation Expansion |
3×63MVA 132/33kV |
2023 |
|
South Africa |
Eskom Grid Upgrade |
5×100MVA 400/132kV |
2022 |
|
Saudi Arabia |
SEC Southern Province Transmission Project |
8×50MVA 132/13.8kV |
2023 |
|
Egypt |
New Administrative Capital Power Supply |
4×180MVA 220/66kV |
2024 |
|
Indonesia |
PLN National Grid |
6×31.5MVA 150/20kV |
2023 |
|
Chile |
Mining Company Captive Power Plant |
2×75MVA 220/23kV |
2022 |
FAQ (For Large Capacity Projects)
Q: How are ultra-large capacity transformers (>200MVA) transported?
A: Large main transformers adopt a detachable transport scheme. The active part and main tank are transported as an integral unit, while radiators, conservator, bushings and other accessories are dismantled and transported separately, then reassembled on site.
|
Component |
Handling Method |
|
Active Part + Main Tank |
Integral transport, kept under positive pressure with nitrogen or dry air |
|
Radiators/Coolers |
Dismantled and transported separately, reassembled and oil-filled on site |
|
Conservator and Accessories |
Dismantled and transported separately, including gas relay, dehydrating breather |
|
Bushings |
Dismantled and transported separately; 330kV and above capacitive bushings require vertical storage/transport |
|
On-Load Tap Changer (OLTC) |
Transported with active part or dismantled separately |
|
Intelligent Components |
Secondary equipment like online DGA, FOTS, PD Monitoring secured with anti-vibration packaging |
Key On-Site Procedures: Vacuum oil filling → Hot oil circulation → Commissioning tests.
Q: Do you participate in EPC turnkey projects?
A: Yes. We can act as a transformer supplier in substation EPC projects or jointly bid with local partners, providing full services from design, supply, installation to commissioning.
Q: How is after-sales service guaranteed in remote areas like Africa or South America?
A: We have regional service centers in Nairobi (Kenya), Johannesburg (South Africa), Dubai (UAE), and Sao Paulo (Brazil), stocking critical spare parts. We commit to a 48-hour response and on-site arrival within 7 days.
Q: Can you assist with grid company type tests or acceptance tests?
A: Absolutely. We are familiar with grid access procedures in various countries. We provide complete type test reports and can cooperate with local grid companies (e.g., Ethiopia EEU, South Africa Eskom) to conduct on-site acceptance tests.
Q: What tender documents are needed for project bidding?
A: We can provide a full set of tender support documents, including: ISO certifications, type test reports, bank credit certificates, reference lists, factory inspection invitations, and third-party (BV/SGS) inspection reports.
📞 Global Hotline: +86-157-1629-5780 (Bilingual Chinese/English)
🌐 Website: www.trustingird.com
- Voltage Level (kV)
- Operating Environment (Altitude/Temperature/Humidity)
- Preferred Cooling Method
- Target Market / Required Certifications
- Project Timeline
We're well-known as one of the leading power transformer manufacturers and suppliers in China, also support customized service. Please feel free to buy high quality power transformer made in China here from our factory. Contact us for more details.