II. 250 MVA-220KV Power Transformer Type
For HENGFENGYOU ELECTRIC, a 250mva transformer can be a three-phase oil immersed transformer, power transformer, etc. These types of transformers have the same principle, but their structures are different, and different types of transformers have different applications. HENGFENGYOU ELECTRIC provides you with the most ideal solution.
250mva three-phase oil immersed transformer (rated voltage 6kV-35kV)
250mva power transformer (rated voltage 66kV-232kV)
III. 250 MVA-220KV Transformer Standar & Certifaication
1. Standards: GB, IEC, GOST, EN, NF, ANSI/IEEE (customizable according to customer standards)
2. Certification: ISO、CE、IEC、SABS、COC、CSA、UL
3. Efficiency: The efficiency of a 250mva transformer is greater than 99%, which can meet the European 2015/2014/548/EC ecodesign Tier 2 energy efficiency regulations.
4. Maintenance free: IP65 protection level, dustproof and moisture-proof, maintenance free, designed for a lifespan of over 25 years.
5. Environmental protection and sustainable development: FR3 vegetable oil can be selected.
6. Overload capacity: Copper coil 250mva transformer allows short-term overload to 150% of rated capacity for no more than 2 hours, but requires monitoring of oil temperature (≤ 95 ℃).
IV. 250 MVA-220KV Power Transformer Price
V.250 MVA-220KV Transformer Case
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VI. 250mva Power Transformers FAQ
Q1: What is a 250mva power transformer?
A 160mva-220kv power transformer is a high-voltage electrical device used to step up or step down voltage in power transmission and distribution systems, typically connecting substations between220kV (primary side) and lower voltages (e.g., 10kV, 35kV).
Q2: What are the common types of 250mva power transformers?
- By Cooling Method: Oil-immersed (ONAN/ONAF/OFAF), dry-type (rare for 220kV).
- By Function: Step-down (220kV→lower voltage), step-up (e.g., generator output to grid).
- By Phase: Three-phase or single-phase (usually grouped for three-phase systems).
Q3: What are key parameters of a 250mva power transformer?
- Voltage ratio: 220kV/(10.5kV, 35kV, etc.).
- Impedance voltage: ~10.5% (varies by design).
- Cooling class: ONAN (oil-natural air-natural), ONAF (forced air).
- Vector group: YNd11, YNy0, etc.
Q4: What standards apply to 250mva power transformers?
- IEC 60076 (international)
- IEEE C57.12.00 (US)
- GB/T 6451 (China)
Q5: What are the key steps for transformer installation?
Site preparation: Foundation, oil containment, fire safety.
Transport & positioning: Use specialized tools to avoid shocks.
Oil processing: Filtration and degassing (for oil-filled units).
Tests: Insulation resistance, turns ratio, DGA (dissolved gas analysis).
Q6: How is a 250mva power transformer commissioned?
- Pre-energization checks (oil level, grounding, protections).
- No-load test: Measure excitation current and losses.
- Load test: Verify temperature rise and performance.
Q7: How to monitor 250mva power transformer health?
DGA: Detect faults via gas analysis (e.g., methane, hydrogen).
Temperature: Oil/winding temperature alarms (e.g., 95°C alarm).
Partial discharge (PD) tests: Detect insulation defects.
Q8: What is routine maintenance for 250mva power transformers?
- Annual oil testing (dielectric strength, moisture).
- Bushing and cooling system inspection.
- Tightness check for gaskets and connections.
Q9: What are common transformer faults?
Insulation failure: Due to aging or moisture.
Overheating: Caused by overloading or cooling system failure.
Bushing leaks: Oil leakage or cracks.
