Large Power Transformers & Autotransformers
230–500 kV; typical 200–600+ MVA
Overview
- High-voltage, high-MVA transformers for transmission-class applications. Oil-immersed, copper-wound designs with step-lap cores.
- Transparent specifications and factory testing, subject to contract and witness. No certification claims.
- Use our datasheet templates and outline drawings as starting points. Final specifications are established by contract.
Typical ratings & options
- Voltage: 230–500 kV primary
- MVA: 200–600+ MVA typical range
- Cooling: ONAN, ONAF, OFAF, ODWF by specification
- Winding: Copper disc/helical
- Core: Step-lap grain-oriented steel
- Insulation: Thermally upgraded Kraft + pressboard
Referenced standards
IEEE/ANSI/IEC applicable standards as specified. We do not claim certifications.
Test program (described)
Factory testing subject to contract and witness arrangements. May include:
- Impulse testing (BIL verification)
- Partial discharge testing
- Heat-run (temperature rise)
- Sound level testing
- Routine tests per specification
- Special tests by agreement
Accessories & monitoring
- Buchholz relays and pressure relief devices
- DGA (dissolved gas analysis) monitoring
- PD (partial discharge) sensors
- Fiber-optic temperature monitoring
- OLTC (on-load tap changer) options
Frequently Asked Questions
Can you meet specific BIL and impedance targets?
Provide targets in your RFP. We review and respond in the specification process.
What monitoring options are available?
We can integrate DGA, PD, and fiber-optic temperature monitoring by specification.