31.5 MVA 115/34.5kV Power Transformer

Additional information

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.

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.