69kV 30 MVA 35 MVA Power Transformer

  • Primary Voltage Ratings: 69 kV
  • Secondary Voltage Ratings: 13.8 kV
  • H.V. TAP RANGE: ±8*1.25%
  • CONNECTION TYPE: YNhd
  • TYPE: 3 phase
  • Application: 69kV Substation
  • Power Rating: 30MVA & 35MVA
  • Cooling Method: ONAN & ONAF

The 69kV 30 MVA / 35 MVA power transformer, designed and manufactured by Daelim Transformer in 2016, serves a 69kV substation in Ecuador. Featuring a three-phase, dual-winding core type structure, it operates at 30 MVA with natural air cooling (ONAN) and up to 35 MVA with fan assistance (ONAF). The transformer includes on-load voltage regulation with a ±8 × 1.25% range. Key components include high and low voltage bushings, an oil conservator, and a fan. Daelim Transformer is dedicated to "Empowering Progress with Precision and Reliability," ensuring superior performance and efficiency.

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30mva 35mva transformer at 69kv substation
 

The 69kV 30 MVA / 35 MVA power transformer was designed and manufactured by Daelim Transformer in 2016. It is utilized in a 69kV substation in Ecuador. This transformer features a three-phase, dual-winding core type structure with a primary voltage of 69 kV and a secondary voltage of 13.8 kV. The cooling system is a one-stage design: it operates at a full load capacity of 30 MVA under natural air cooling (ONAN), and can reach up to 35 MVA when the fan is activated (ONAF).

Specifications:30 mva 35 mva transformer

  • Core Material: Cold-rolled silicon steel
  • Core Structure: Stacked core
  • High Voltage Winding: 69 kV
  • Low Voltage Winding: 13.8 kV
  • Rated Frequency: 60 Hz
  • Rated Capacity: 35,000 kVA
  • Phase: 3
  • Voltage Regulation Method: On-load voltage regulation
  • Voltage Regulation Range: ±8 × 1.25%
  • Neutral Point Grounding Method: Ungrounded
  • Cooling Method: ONAN (30 MVA) / ONAF (35 MVA)
  • Link Group Label: YNhd
  • Impedance Voltage (35 MVA): 10.34%
  • Load Loss: 32 kW
  • Load Loss (ONAN): 110 kW

Insulation Levels:

  • High Voltage Lightning Impulse Voltage (Full Wave, Peak Value): 360 kV
  • High Voltage Lightning Impulse Voltage (Chopped Wave, Peak Value): 325 kV
  • Rated Short-Time Power Frequency Withstand Voltage (Effective Value): 140 kV
  • Low Voltage Lightning Impulse Voltage (Full Wave, Peak Value): 75 kV
  • Low Voltage Lightning Impulse Voltage (Chopped Wave, Peak Value): 85 kV
  • Rated Short-Time Power Frequency Withstand Voltage (Effective Value): 35 kV

Temperature Rise:

  • Top Oil: 60 K
  • Winding (Average): 65 K
  • Winding (Hot Spot): 78 K
  • Core, Oil Tank, and Structural Surface: 75 K

Noise Level: 58 dB

Pressure Relief Device:

  • Release Pressure: 0.055 MPa
  • Resume Pressure: 0.0295 MPa

Components (35 MVA Version):

  • 72.5 kV High Voltage Bushings
  • 25 kV Pure Porcelain Low Voltage Bushings
  • Oil Conservator (Including Oil Level Gauge, Capsule, etc.)
  • Tap Changer
  • Temperature Indicator
  • Pressure Relief Device
  • Oil Drain Valve
  • Stainless Steel Nameplates
  • Fan
  • Stainless Steel Wind Control Box

At Daelim Transformer, we are committed to excellence and innovation in every transformer we design and manufacture. Our transformers are engineered to deliver reliability and efficiency, ensuring optimal performance for your power needs. "Empowering Progress with Precision and Reliability"—this is our promise to you.

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