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Double-winding OLTC 110kV Power Transformer Trusted Solution for Long-Term Power Infrastructure

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Double-winding OLTC 110kV Power Transformer Trusted Solution for Long-Term Power Infrastructure

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Payment Terms : T/T

Cooling Medium : Mineral oil or ester-based oil

Vector Group : Dyn11

Rated Capacity : 40000 kva

Reference Standards : IEC 60076

Winding Material : Copper or aluminum

Warranty : 3 Year

Cooling Method : ONAN/ONAF/ONAF+W

Standards Compliance : IEC, ANSI, IEEE

Phase : Three-phase

Tap Changer : On-load tap changer (OLTC) / Off-circuit tap changer

Oil Type : Mineral insulating oil

Impedance Voltage : Typically 10% to 15%

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Double-winding OLTC 110kV Power Transformer - Trusted Solution for Long-Term Power Infrastructure
HENTG POWER Double-winding OLTC 110kV Power Transformer offers a reliable solution for long-term power infrastructure with high reliability, strong voltage regulation capability, and optimized total cost of ownership. The 40000 kVA 110 kV oil-immersed main power transformer is a dependable choice for utilities, EPC contractors, and energy investors seeking stable and secure high-voltage power transmission solutions.
Key Features
  • Customizable voltage up to 132kV
  • High short circuit withstand capability
  • Low loss design for cost savings
  • Customized transformer solutions available
  • Compact dimensions and reduced weight
  • Extended operational lifespan
  • Ester oil insulation for superior fire safety
  • 7-step stepping lap iron core structure with cold rolled grain oriented silicon steel
  • High-temperature and low-temperature resistant insulation system
Technical Specifications
Transformer Type Oil Immersed
Rated Capacity 40MVA
Rated Voltage 110kV (customized up to 132kV)
Frequency 50/60Hz
Phase Three Phase
Winding Material Copper / Aluminum
Insulation Class A (105℃), E (120℃), B (130℃)
Vector Group Dyn11 YNd1d1, etc.
Cooling ONAN, KNAN, ONAF, KNAF
Dielectric Liquid Mineral oil, Silicone, FR3 Oil, Midel etc.
Tap Changer Off-load or on-load
Ambient Temperature -45℃ ~ +50℃
Standard IEC, AS, EN, IEEE, ANSI, GOST
Accessories Conservator, Pressure Relief Device, Tap Changer, Oil Temperature Indicator, Bucholz Relay, Lifting Lugs
All transformers can be designed, customized, and supplied with a wide variety of accessories as required.
Custom Product Options
  • K-Factor Rated
  • Harmonic Mitigation
  • Custom Dimensions for Size & Weight Constraints
  • Custom Enclosures for Tough Environmental Conditions
  • Unique Input and Output Voltages
  • Low Inrush Current
  • 6, 12, 18, 24 and 36 Pulse Drive Isolation Transformers
  • Rectifier Duty
  • High Efficiency
  • Low Audible Noise
  • Low Temperature Rise
  • Marine Duty
  • Hazardous Location
Double-winding OLTC 110kV Power Transformer Trusted Solution for Long-Term Power Infrastructure
Each transformer is prepared and issued with a test report in accordance with IEC 60076. In addition to routine tests, we also offer type tests and specialized tests to meet all customer requirements. We ensure our products work safely and reliably for our customers.
Double-winding OLTC 110kV Power Transformer Trusted Solution for Long-Term Power Infrastructure
Routine Tests
  • Measurement of winding resistance
  • Measurement of voltage ratio and check of phase displacement
  • Measurement of short-circuit impedance and load loss
  • Measurement of no-load loss and current
  • Separate-source AC withstand voltage test
  • Induced AC withstand voltage test
  • Partial discharge measurement
Type Tests
  • Lightning impulse test
  • Temperature-rise test
  • Determination of sound level for each method of cooling
  • Measurement of the power taken by the fan and liquid pump motors
  • Measurement of no-load loss and current at 90% and 110% of rated voltage
Special Tests
  • Partial discharge measurement
  • Measurement of sound level
  • Short-circuit withstand test
  • Determination of capacitances windings-to-earth, and between windings
  • Vacuum deflection test on liquid immersed transformers
  • Pressure deflection test on liquid immersed transformers

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