31.5 MVA 115/34.5kV Power Transformer

  • Primary Voltage Ratings: 115 kV
  • Secondary Voltage Ratings: 34.5 kV
  • H.V. TAP RANGE: 115kV*+/- 16 x 0,625 %
  • CONNECTION TYPE: YNyn0d1
  • Standards: IEC
  • Application: 115lV Substation
  • Power Rating: 31.5MVA/36MVA
  • Cooling Method: ONAN & ONAF

The 31.5 MVA 115/34.5 kV Transformer is an IEC-standard, mineral oil-immersed unit designed for continuous operation. It features a robust ONAN/ONAF cooling system and includes a 32-step on-load tap changer, automatic voltage regulator, and multiple safety accessories like Buchholz relays and thermal imaging. Suitable for outdoor installation, it supports a maximum primary voltage of 123 kV and secondary voltage of 36 kV. This transformer ensures reliable performance with a temperature rise of 55/65 ºC and includes comprehensive monitoring and protection features.

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Overview

Introducing the high-performance 31.5 MVA Power Transformer, engineered to meet IEC standards and specifically designed for the Philippine substation project. This transformer ensures reliable and efficient power distribution in demanding conditions.

Key Specifications:

  • Rated Power: 31.5 MVA (Continuous) / 36 MVA (Short-Term)
  • Nominal Voltage: 115 kV / 34.5 kV
  • Number of Phases: 3
  • Cooling System: ONAN/ONAF
  • Type: Mineral Oil Immersed Transformer
  • Rated Frequency: 60 Hz
  • Working Regime: Continuous
  • Primary Voltage: 115 kV
  • Maximum Service Primary Voltage: 123 kV
  • Primary Winding: Wye with Neutral
  • Tapping Range: +/- 16 x 0.625%
  • Secondary Voltage: 34.5 kV
  • Maximum Service Secondary Voltage: 36 kV
  • Secondary Winding: Wye with Neutral
  • Compensation Winding Voltage (Tertiary): 15 kV (Compensation Only, Not Accessible)
  • Maximum Service Tertiary Voltage: 17.5 kV
  • Compensation Winding: Delta
  • Connection Group: YNyn0d1
  • BIL: 550/170/95 kV
  • Coil Material (HV/LV): Copper
  • Coil Material (Compensation Winding): Copper
  • Isolation Material: Mineral Oil
  • Conservator Tank: Included
  • Temperature Class: E (120 ºC)
  • Temperature Rise (Oil/Coil): 55/65 ºC
  • Altitude: <3000 feet
  • Ambient Temperature: Max 45 ºC, Min 5 ºC
  • Location: Outdoor
  • Color: Gray, RAL 7035
  • Bushing Location (HV/LV): Top Cover

Accessories:

  • On Load Tap Changer (OLTC): 32 Steps Huaming or Equivalent
  • Tap Position Indicator
  • Automatic Voltage Regulator (AVR)
  • OLTC Conservator
  • HV Condenser Bushing
  • LV Condenser Bushing
  • LV Porcelain Bushing
  • NEMA Connectors
  • Buchholz Relay with Two Contacts
  • Oil Conservator System with Membrane
  • Membrane/Bag Rupture Relay
  • Pressure Relief Valve with Two Contacts
  • Sudden Pressure Relay
  • Thermal Imaging Relay
  • Shutter Valve
  • Dehydrating Breather - Silica Gel (Main Tank)
  • Dehydrating Breather - Silica Gel (OLTC)
  • Magnetic Oil Level Indicator with Two Contacts (Main Tank)
  • Magnetic Oil Level Indicator with Two Contacts (OLTC)
  • Transformer Monitor Temperature and Parallelism (SEL 2414 or Equivalent)
  • Temperature Sensor PT100
  • Protection Type CTs (HV and LV)
  • Metering CTs (HV and LV)
  • Thermal Imaging CTs (HV and LV)
  • OLTC CTs
  • Fans
  • Accessory Connection Box + Forced Ventilation Kit
  • Removable Radiators
  • Bidirectional Wheels
  • Nameplate with Essential Data
  • Oil Filling and Draining Valves (Main and Conservator Tanks)
  • Oil Sampling Device
  • Grounding Terminals
  • Lifting Lugs and Connections for Haulage

Contact Us

For detailed specifications, further inquiries, or to request a quotation, please reach out to Daelim Transformer directly. We are committed to providing you with the highest quality transformers tailored to your needs.

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