HENGFENGYOU TRANSFORMER|ANSI/IEEE STANDARD TRANSFORMER
HENGFENGYOU TRANSFORMER|ANSI/IEEE STANDARD TRANSFORMER
The 500kV three‑phase oil‑immersed power transformer is a core extra-high-voltage (EHV) grid device, serving as the key backbone equipment for Chinese standard, Russian standard, Southeast Asian, South American and Central Asian national power grids. As a critical voltage level for cross-provincial/cross-border bulk power transmission, large-scale new energy base integration, ultra-large power plant step-up, and national main grid framework construction, it undertakes long-distance, high-capacity power delivery and grid frequency & voltage stabilization tasks. The maximum design capacity reaches 1000MVA, adapting to ultra-large load operation and long-distance transmission demands of national main grids. Backed by 30 years of EHV & UHV transformer precision manufacturing experience, Hengfengyou Electric provides full-set 500kV transformer solutions compliant with GB, IEC, GOST and international universal standards, featuring ultra-low loss, extreme climate adaptability, strong grid impact resistance and full-life-cycle stability. The products have been reliably operating in more than 50 countries with 500kV voltage systems worldwide.
Mainstream Type: Three‑phase two‑winding / three‑winding / auto-transformer oil‑immersed power transformer (500kV auto-transformer is the dominant type for national main grid interconnection and hub substations)
Capacity Range: 300MVA – 1000MVA
Cooling Mode: OFAF, ODAF (grid mainstream heavy-duty cooling); ONAN/ONAF optional for partial regional industrial supporting substations
Core Application Countries & Regional Attributes
500kV Standard Applicable Countries
- China, Mongolia, Central Asia (Kazakhstan, Uzbekistan, Kyrgyzstan): GB & GOST dual-standard grid system
- Russia, Belarus, Ukraine: Commonwealth of Independent States (CIS) GOST standard 500kV backbone grid
- Southeast Asia (Vietnam, Thailand, Indonesia, Myanmar): China-standard imported grid equipment system
- South America (Brazil, Argentina): Large-capacity 500kV long-distance transmission grid
- Parts of Middle East and Africa: Large-scale new energy base supporting 500kV transmission projects
Typical Scenarios: National 500kV backbone hub substations, cross-border long-distance power transmission projects, ultra-large thermal/hydropower plant main step-up stations, gigawatt-level wind/solar centralized new energy bases, provincial/country-level core power supply hubs, large-scale energy storage grid-connected supporting stations
Dominant Standards: GB 1094 series national standard, IEC60076 international universal standard, GOST (Russia/CIS mandatory standard), compatible with EN, ANSI/IEEE, fully meeting the bidding and grid access requirements of Chinese-standard and Russian-standard countries
Authoritative Certifications: ISO quality system certification, CE, IEC, SABS, COC, CSA, UL, complete qualification certification for EHV grid projects in Asia, Europe, Africa and South America
Energy Efficiency & Loss Performance: Overall operating efficiency ≥99.55%, compliant with national first-class energy efficiency standard and EU Ecodesign Tier 2 high energy-saving requirements. Adopts ultra-low-loss high-permeability silicon steel sheets and optimized electromagnetic finite element simulation design, effectively reducing long-term grid operating loss, adapting to low-carbon and high-efficiency operation requirements of large-capacity EHV power grids.
Two‑Winding Transformer: 500kV + single medium/low voltage; simple structure, strong overload resistance and high operational stability, mainly applicable to large independent hydropower/thermal power plant grid-connected step-up projects in Central Asia and Southeast Asia
Three‑Winding Transformer: 500kV + dual medium/low voltage; supports multi-voltage hierarchical power supply and multi-station parallel scheduling, suitable for urban core hub substations and comprehensive energy distribution centers in Chinese and Southeast Asian regional grids
Auto‑Transformer (Grid Mainstream): Compact structure, low transmission loss, high operational efficiency, the most widely used model for 500kV main grid interconnection, cross-regional power transmission and grid frame expansion in China, Russia and Central Asian countries
MR (Germany): Ultra-high mechanical stability, switching life >200,000 times, suitable for core 500kV backbone grid projects and long-term frequent voltage regulation scenarios, preferred for Russian CIS national grids and large cross-border transmission projects
ABB: Excellent smart grid compatibility, perfect global after-sales service layout, stable operation in high-load and fluctuating grid environments, the first choice for South American and international EPC large-scale 500kV projects
Huaming (China): High cost performance, fast on-site after-sales response, stable technical parameters, matching Chinese standard grid operation habits, widely used in conventional grid reconstruction and new energy supporting projects in Southeast Asia and Central Asia
Regional Selection Principle: Russia/CIS core grid projects adopt MR; South American international EPC projects adopt ABB; Southeast Asian and Central Asian conventional grid and new energy projects adopt cost-effective domestic supporting schemes.
Russia & Central Asia (Kazakhstan/Uzbekistan): Special ultra-low temperature resistant design, anti-freezing and low-temperature start-up optimization, adapted to -40℃ extreme cold weather, anti-dust and anti-dry wind coating for arid grassland environments
Southeast Asia (Vietnam/Thailand/Indonesia): High temperature and high humidity resistance, mildew-proof and moisture-proof insulation optimization, enhanced coastal salt fog corrosion resistance, stable operation in tropical rainforest and monsoon climate
South America (Brazil/Argentina): Strong load fluctuation resistance, adapted to seasonal hydropower surge and new energy intermittent output, enhanced outdoor UV aging resistance
China & Mongolia Plateau: High altitude low-air-pressure insulation enhancement, strong wind and sand resistance, anti-icing and snow-proof design, adapting to plateau extreme weather and harsh grid conditions
Adopts EHV-grade GIS/HGIS fully enclosed switchgear for compact layout, meeting GB, IEC and GOST substation safety spacing standards. Equipped with high-insulation 500kV dedicated gas-oil bushings and fully enclosed GIB busbars, effectively reducing electromagnetic interference. Strictly complies with grid N‑1 safety operation criterion, supporting single-unit independent operation, multi-unit parallel grid connection and cross-border power interconnection, adapting to the stable operation requirements of large-capacity EHV main grids in various countries.
Lifting & Placement: Professional super-large equipment precision hoisting and positioning, strictly implementing EHV project installation specifications of China, Russia and international standards to avoid structural stress deformation
Accessory Installation: Standardized installation and debugging of high-power radiators, 500kV ultra-high voltage bushings, sealed oil conservators, heavy-duty cooling systems and brand-matched OLTC devices
Vacuum Oil Filling & Hot Oil Circulation: Secondary vacuum degassing and high-temperature hot oil circulation process, eliminating internal micro-moisture and residual gas to ensure ultra-high insulation margin
Standing & Venting: Static placement ≥120 hours, repeated degassing and multi-index sampling inspection to meet EHV grid high-standard acceptance requirements
Grounding Construction: Integrated multi-point combined reliable grounding system, grounding resistance strictly controlled ≤1Ω, meeting GB/IEC/GOST multi-standard safety requirements
Equipped with EHV high-performance zinc oxide lightning arresters to resist lightning surge and operating overvoltage impact. Matched with 500kV ultra-high stability circuit breakers and dedicated CSP fuses. Configured with complete main and backup relay protection systems including differential protection, Buchholz gas protection, overcurrent/zero-sequence protection, temperature linkage protection, pressure protection and gas fault protection, fully compliant with EHV grid protection specifications of various countries, realizing full-coverage safety monitoring and fault isolation.
All tests are implemented in strict accordance with GB, IEC and GOST EHV unified standards, covering winding DC resistance test, voltage ratio calibration, polarity and vector group verification. Complete insulation resistance detection, power frequency withstand voltage and induced withstand voltage test to verify internal insulation strength. Conduct ultra-high-standard partial discharge test exclusive for 500kV EHV equipment. Perform full-index transformer oil analysis including breakdown voltage, moisture content, DGA dissolved gas analysis and furan detection. Complete no-load and load loss tests to verify ultra-high energy efficiency indicators.
Carry out main and backup protection integrated linkage test to ensure accurate and reliable protection action. Complete 5 times no-load impulse closing tests to verify equipment insulation stability and impact resistance. Conduct full-load trial operation and protection polarity calibration, and full-stroke linkage debugging of cooling system and OLTC to ensure all parameters meet grid access standards.
Adopts super-long life EHV dedicated design, with standard design life ≥40 years, and the actual service life can reach 50 years under standardized professional maintenance. Equipped with full-set intelligent online monitoring system, supporting real-time monitoring of DGA dissolved gas, core grounding current, winding temperature, partial discharge and bushing operating status. Realizes remote data transmission, intelligent early warning and condition-based maintenance, adapting to unattended and intelligent O&M modes of modern large-scale substations. Core life extension index: winding hot-spot temperature strictly controlled ≤58℃, avoiding long-term overload operation.
Optional EU/GB-certified FR3 biodegradable vegetable insulating oil with biodegradability >95%, green and pollution-free, meeting environmental assessment requirements of European, Asian and American projects. The equipment adopts a high proportion of recyclable metal and insulating materials, with low full-life-cycle carbon emissions, fully fitting the global dual-carbon strategic layout and green EHV grid construction standards.
Standard Universal Model: 210 days production and delivery cycle
Emergency Key Project Order: Fastest 150 days delivery
Regional Custom Special Model: Russian ultra-low temperature resistance, Southeast Asian high-humidity anti-corrosion, plateau high-altitude customized model: 9–12 months
| Item | Core Content | Recommended Scheme/Standard |
|---|---|---|
| Type | 500kV three‑phase oil‑immersed EHV power main transformer | Two/three-winding/auto-transformer, 300MVA–1000MVA |
| Applicable Grid | Global mainstream 500kV EHV voltage system countries | China/Russia/Central Asia/Southeast Asia/South America standard grid |
| Standards | Multi-standard compatible EHV universal specifications | GB/IEC/GOST, compatible with EN/ANSI/IEEE |
| Efficiency | Ultra‑high efficiency, ultra‑low loss | ≥99.55%, National Class 1 & EU Tier 2 Energy Efficiency |
| Life | Extra‑long life EHV professional design | Design life ≥40 years, actual life up to 50 years |
| Eco | Global green environmental protection standard | FR3 vegetable oil optional, biodegradability >95% |
| Cooling | EHV grid heavy-duty cooling system | OFAF/ODAF mainstream, ONAN/ONAF optional |
| OLTC | Regionally matched professional brand | MR for Russia/CIS; ABB for South America; Huaming for Southeast Asia/Central Asia |
| Grounding | Multi-standard unified safety grounding | Grounding resistance ≤1Ω |
| Delivery | Global EHV project lead time | Standard 210d, fastest 150d, customized 9–12 months |
Hengfengyou 500kV EHV power main transformer is tailored for global 500kV ultra-high voltage grid systems, covering Chinese standard national backbone grids, Russian CIS standard grids, Southeast Asian tropical power grids, Central Asian plateau arid grids and South American large-capacity transmission grids. Relying on 30 years of EHV&UHV professional manufacturing experience, the product complies with GB, IEC, GOST and other multi-country authoritative standards, with ultra-high efficiency of 99.55% and 40+ years super-long design life. It adopts targeted customized designs for ultra-low temperature resistance in Russia, high temperature and humidity resistance in Southeast Asia, plateau wind and sand resistance in Central Asia, and intermittent new energy load adaptation in South America, realizing highly reliable adaptive operation in diverse global regional environments.
Our 500kV transformers have been successfully put into stable operation in China, Russia, Kazakhstan, Vietnam, Thailand, Brazil and other 50+ countries and regions, with excellent grid adaptability and low-loss economic operation performance. We provide full-life cycle one-stop services including regional customized design, modular precision manufacturing, on-site installation guidance, standardized commissioning and intelligent operation and maintenance, delivering safe, efficient and low-carbon overall power transmission and transformation solutions for global EHV grid projects.
Q1: What is a 500kV power main transformer?
A: The 500kV transformer is a core extra-high voltage grid equipment, serving as the backbone of national power transmission systems in China, Russia, Central Asia, Southeast Asia and South America. It is mainly used for stepping up power from large power plants and new energy bases to 500kV for long-distance bulk power transmission, or stepping down 500kV EHV power to 220kV/110kV for regional power distribution, with a capacity range of 300MVA–1000MVA. It is the standard core equipment for large-capacity national main grid construction.
Q2: Which countries and scenarios are 500kV transformers suitable for?
Applicable Countries: China, Mongolia, Russia, Belarus, Kazakhstan, Uzbekistan, Vietnam, Thailand, Indonesia, Brazil, Argentina and other 500kV standard voltage system countries.
Core Scenarios: National EHV backbone grid hubs, cross-border long-distance power transmission, ultra-large hydropower/thermal power plant step-up, gigawatt-level wind/solar new energy base grid connection, urban core bulk power supply substations.
Q3: Differences between two-winding, three-winding and auto 500kV transformers?
Two-winding: Simple structure, strong overload resistance, cost-effective, priority for large independent power plant step-up projects in Central Asia and Southeast Asia.
Three-winding: Multi-voltage output, flexible grid scheduling, suitable for urban multi-load comprehensive hub substations.
Auto-transformer: Low loss and high transmission efficiency, the mainstream model for national main grid interconnection and frame expansion projects in all 500kV system countries.
Q4: How to select OLTC brands for different regions?
MR (Germany): Ultra-high stability, preferred for Russia, CIS core grids and harsh environment EHV projects.
ABB: Global service network and smart grid adaptation, the first choice for South American international EPC projects.
Huaming: High cost performance and fast after-sales service, widely used in Southeast Asian and Central Asian conventional grid and new energy supporting projects.
Q5: What is the delivery cycle for 500kV transformers?
Standard universal model: 210 days; emergency key project order: fastest 150 days; regional climate customized special model: 9–12 months.
Q6: What is the service life and core operating requirements?
Design life ≥40 years (GB/IEC/GOST EHV standard), actual service life up to 50 years with standardized professional maintenance. Core control index: winding hot-spot temperature ≤58℃, prohibit long-term overload operation.
Q7: What is the warranty policy?
24–36 months contract warranty after delivery, covering all manufacturing quality defects. OLTC and EHV high-voltage bushings enjoy 2 years independent warranty. Exclude man-made damage and force majeure natural disasters.
Q8: What regional after-sales support is available?
Provide global on-site installation guidance and full-process commissioning technical support, professional operation and maintenance personnel training, regular preventive testing and maintenance, 48-hour global emergency response, and intelligent monitoring system upgrade and transformation services.
Q9: What are the regional customized advantages of 500kV transformers?
Realize targeted regional customization: ultra-low temperature and frost resistance for Russian and Central Asian cold regions, high temperature, humidity and salt fog resistance for Southeast Asian tropical regions, UV and load fluctuation resistance for South American hydropower/new energy bases, and high-altitude wind and sand resistance for plateau regions, fully matching local climate and grid operation characteristics.
