The 132kV / 138kV Power Transformer is designed for high-voltage transmission and substation applications. The following specification provides a professional baseline for EPC, utility, industrial, and renewable-energy projects. Final values can be customized according to the approved technical specification.

General Specifications

Typical 132kV / 138kV Voltage Configurations

Protection & Accessories

The transformer can be equipped with:

• Buchholz Relay

• Pressure Relief Device

• Oil Temperature Indicator

• Winding Temperature Indicator

• Magnetic Oil Level Gauge

• Silica Gel Breather

• Conservator Tank

• Oil Drain & Sampling Valves

• Earthing Terminals

• High-Voltage Bushings

• Neutral Bushing

• OLTC Control Cabinet

• Cooling Fan Control Cabinet

• Surge Arrester

• Online Monitoring System

Optional Intelligent Monitoring

For utility and EPC projects, the transformer can be configured with:

Online DGA Monitoring • Bushing Monitoring • OLTC Monitoring • Temperature Monitoring • Moisture Monitoring • RS485 / Modbus • IEC 61850 • SCADA Integration

Performance & Testing

Each transformer can be subjected to comprehensive factory testing, including:

• Winding resistance test

• Voltage ratio test

• Vector group test

• No-load loss test

• Load loss test

• Short-circuit impedance test

• Applied voltage test

• Induced voltage test

• Insulation resistance test

• OLTC operation test

• Leakage / pressure test

Additional type tests, special tests, FAT and third-party inspection can be provided according to EPC or utility requirements.

Custom Engineering

The 132kV / 138kV Power Transformer can be customized for:

MVA Capacity • Voltage Ratio • Frequency • Vector Group • Impedance • OLTC • Cooling • Insulation Level • Bushings • Protection • Monitoring • Enclosure • Climate • Installation Conditions

132kV / 138kV | Custom MVA | OLTC | ONAN/ONAF | IEC / IEEE / ANSI | EPC & Utility Projects

High-Voltage Transmission Capability

Designed for 132kV and 138kV transmission and sub-transmission networks, with insulation systems engineered for high electrical stress and long-term reliability.

High Efficiency

Optimized magnetic core and winding design reduces:

• No-load losses

• Load losses

• Operating costs

• Temperature rise

Strong Short-Circuit Capability

The winding structure is mechanically reinforced to withstand the electromagnetic forces generated during short-circuit conditions.

Reliable Insulation System

The insulation system is designed around:

Oil + Paper / Pressboard + Insulation Components + Controlled Electric Field Distribution

High-quality insulation materials and optimized field grading improve dielectric reliability.

Flexible Cooling

Different cooling configurations can be selected according to transformer capacity and operating conditions:

ONAN → ONAF → OFAF / OFWF

OLTC Voltage Regulation

An On-Load Tap Changer (OLTC) can be installed to regulate the output voltage while the transformer remains energized.

This is particularly useful for utility substations where grid voltage fluctuates during operation.

1. Magnetic Core

The core is manufactured from high-quality grain-oriented electrical steel.

Typical design features include:

• Step-lap core construction

• Low magnetic flux density

• Reduced no-load losses

• Low excitation current

• Reduced operating noise

• High mechanical stability

The core is carefully clamped to maintain mechanical integrity during transportation and operation.

2. High-Voltage Winding

The HV winding is designed specifically for high-voltage electrical stress.

The design considers:

• Voltage distribution

• Inter-turn insulation

• Inter-layer insulation

• Axial and radial forces

• Short-circuit withstand capability

• Impulse voltage distribution

Depending on the capacity and voltage class, different winding structures can be selected.

3. Low-Voltage / Medium-Voltage Winding

The secondary winding can be configured for common substation voltages such as:

11kV • 13.8kV • 33kV • 34.5kV

Customized voltage ratios are also available.

4. Transformer Tank

The transformer tank is manufactured from high-strength steel and designed to withstand:

• Vacuum conditions

• Pressure variations

• Transportation vibration

• Thermal expansion

• Electromagnetic forces

The tank can be subjected to leakage and pressure testing before shipment.

Tap Changer

For 132kV / 138kV power transformers, an OLTC can be provided for automatic voltage regulation.

Typical options include:

• ±10%

• ±12.5%

• ±15%

The actual tap range and number of positions are customized according to the grid specification.

The OLTC can be integrated with:

• Automatic Voltage Regulator

• AVR Control Panel

• Remote Control

• SCADA

• Digital Monitoring System

Cooling System

The cooling system is selected according to transformer capacity and project requirements.

ONAN

Oil Natural Air Natural

Suitable for transformers where natural oil and air circulation can provide sufficient cooling.

ONAF

Oil Natural Air Forced

Cooling fans increase heat dissipation and improve the transformer's load capability.

OFAF

Oil Forced Air Forced

Oil pumps and cooling fans are used for larger-capacity transformers.

OFWF

Oil Forced Water Forced

Suitable for specific high-capacity or special installation environments.

Protection & Accessories

A complete 132kV / 138kV transformer can be equipped with comprehensive protection and monitoring devices.

Standard / Common Accessories

• Buchholz Relay

• Pressure Relief Device

• Oil Level Gauge

• Oil Temperature Indicator

• Winding Temperature Indicator

• Silica Gel Breather

• Conservator Tank

• Drain Valve

• Sampling Valve

• Earthing Terminals

• Lifting Lugs

• Jacking Pads

Optional Monitoring

• Online dissolved gas analysis

• Moisture monitoring

• Bushing monitoring

• Fiber-optic temperature monitoring

• OLTC monitoring

• Remote data acquisition

• RS485 / Modbus

• IEC 61850 communication

• SCADA integration

Bushings

The 132kV / 138kV transformer can be equipped with high-voltage condenser bushings suitable for the specified system voltage and insulation level.

Configuration can be customized according to:

• Rated voltage

• Rated current

• BIL / LI level

• Creepage distance

• Pollution level

• Altitude

• Installation environment

• Customer-approved drawings

For coastal, desert or heavily polluted environments, an increased creepage distance can be considered.

Insulating Oil

The transformer can use:

• Mineral transformer oil

• Natural ester fluid

• Synthetic ester fluid

The oil insulation system is selected according to the project requirements and applicable standards.

Before filling, the insulating fluid can undergo appropriate treatment such as:

Filtration → Vacuum Treatment → Moisture Removal → Dielectric Strength Verification → Filling

The 132kV / 138kV Power Transformer can be engineered according to EPC, utility and grid requirements.

Electrical

• 132kV / 138kV HV

• 11kV / 13.8kV / 33kV / 34.5kV LV/MV

• Customized MVA capacity

• 50Hz / 60Hz

• Customized vector group

• Customized impedance

• Customized insulation level

• OLTC

• Off-circuit tap changer

Mechanical

• Conservator type

• Sealed tank

• Radiator configuration

• Detachable radiator

• Customized enclosure

• Customized terminal arrangement

• Customized dimensions

Environmental

• High-altitude design

• Tropical design

• Desert design

• Coastal / salt-spray protection

• High-humidity design

• High-temperature design

• Seismic requirements

• Anti-corrosion coating