132kV / 138kV Power Transformer designed for utility substations, power plants, renewable energy and large industrial projects. Custom MVA capacity, voltage ratio, OLTC and cooling system available. Engineered to IEC/IEEE/ANSI standards with comprehensive factory testing and EPC project support.
The 132kV / 138kV Power Transformer is a high-voltage oil-immersed transformer engineered for reliable power transmission and substation applications. It is designed to step voltage up or down between transmission, sub-transmission, and medium-voltage networks, supporting stable and efficient power delivery for large-scale electrical projects.
Available in customized capacities and voltage configurations, the transformer can be designed for applications such as 132/11kV, 132/33kV, 138/13.8kV, and 138/34.5kV systems. Cooling configurations including ONAN, ONAF, OFAF, and OFWF can be selected according to transformer capacity and operating conditions.
The transformer features a high-quality grain-oriented silicon steel core, optimized winding structure, robust insulation system, and high mechanical strength to withstand demanding operating and short-circuit conditions. An On-Load Tap Changer (OLTC) can be integrated for voltage regulation and stable grid operation.
For EPC, utility, renewable energy, and industrial projects, the transformer can be customized according to voltage ratio, rated capacity, impedance, vector group, insulation level, cooling method, tap range, bushing configuration, protection system, monitoring equipment, and installation environment.
Comprehensive factory testing is performed before delivery, including winding resistance, voltage ratio, vector group, no-load loss, load loss, impedance, insulation and withstand tests. Additional FAT, type tests, special tests, and third-party inspection can be arranged according to project requirements.
The 132kV / 138kV Power Transformer is suitable for utility substations, power plants, solar and wind farms, industrial facilities, mining projects, and large-scale grid interconnection systems, providing a reliable and project-specific solution for high-voltage power transmission and distribution.
132kV / 138kV • Custom MVA Capacity • OLTC • ONAN/ONAF • IEC/IEEE/ANSI • EPC Project Support
Zisheng are a professional 19+ years manufacturer in producing Oil-Immersed Transformers, Compact Substation, Pad Mounted Transformers, Pole Mounted Transformers and Dry Type Transformers. We own the certificates of ISO/CE/IEC 60076 and TUV Rheinland.
Transformers undergo rigorous FAT and type testing, support voltage/capacity customization. Welcome to consult for Catalog and Product. you can contact us at email [email protected].
Project Type: High-Voltage Substation
Equipment: 132kV / 138kV Power Transformer
Application: Grid Transmission & Power Distribution
Customer: Utility / EPC Contractor
Installation: Outdoor Substation
Project Overview
This project required a high-voltage power transformer for a 132kV / 138kV substation, providing reliable voltage transformation between the transmission network and the medium-voltage distribution system.
The transformer was engineered according to the project’s capacity, voltage ratio, insulation level, cooling requirements, tap-changing requirements, protection configuration, and installation environment.
Transformer Configuration
Rated Voltage: 132kV / 138kV
Rated Capacity: Customized according to project requirements
Frequency: 50Hz / 60Hz
Phase: Three Phase
Cooling: ONAN / ONAF
Tap Changer: OLTC / Customized
Winding: Copper
Insulation: Oil-Paper Insulation System
Installation: Outdoor
Standard: IEC 60076 / IEEE / ANSI as specified
Engineering & Manufacturing
The transformer was manufactured with a focus on high-voltage insulation reliability, low losses, mechanical strength, thermal performance, and long-term operating stability.
Key manufacturing processes included:
Core Assembly → Winding → Insulation → Active Part Assembly → Tank Assembly → Vacuum Treatment → Oil Filling → Testing
The transformer was subjected to comprehensive factory testing before shipment.
Factory Testing
Testing included:
Winding resistance
Voltage ratio
Vector group
No-load loss
Load loss
Short-circuit impedance
Applied voltage
Induced voltage
Insulation performance
OLTC operation
Transformer oil testing
Additional FAT and third-party inspection can be arranged for EPC and utility projects.
Project Delivery
The transformer and associated components were prepared for international transportation with customized export packaging and shipping arrangements.
The project delivery process included:
Technical Confirmation → Customized Engineering → Manufacturing → Factory Testing → Inspection → Export Packing → Shipment → Site Installation Support
Project Value
The solution provides:
Reliable 132/138kV Grid Connection
Stable Voltage Transformation
High Short-Circuit Withstand Capability
Customized Cooling & Voltage Regulation
Comprehensive Factory Testing
EPC-Oriented Technical Documentation
Suitable Project Types
This 132kV / 138kV transformer solution is suitable for:
Utility substations
Solar power plants
Wind farms
Power generation projects
Industrial substations
Mining projects
Grid expansion projects
Large-scale infrastructure projects
Custom-Engineered for High-Voltage Power Projects
132kV / 138kV • Utility Grade • EPC Support • Factory Tested • Global Delivery
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
Item Specification
Product Type Oil-Immersed Power Transformer
Rated Capacity 10–200+ MVA, Customized
Number of Phases Three Phase
Rated Frequency 50Hz / 60Hz
HV Rated Voltage 132kV / 138kV
MV/LV Rated Voltage 11kV / 13.8kV / 33kV / 34.5kV / Customized
Voltage Ratio 132/11kV, 132/33kV, 138/13.8kV, 138/34.5kV, etc.
Cooling Method ONAN / ONAF / OFAF / OFWF
Tap Changer OLTC / Off-Circuit Tap Changer
Tap Range Typically ±10% / ±12.5% / ±15%, Customized
Vector Group Dyn11 / YNd11 / YNyn0 / Customized
Winding Material Copper / Aluminum
Insulation System Oil-Paper Insulation
Insulating Medium Mineral Oil / Ester Fluid
Core Material Grain-Oriented Electrical Steel
Core Construction Step-Lap / Mitred Core
Tank Type Conservator / Sealed Type
Installation Outdoor / Indoor
Temperature Rise According to project specification
Impedance Customized according to system requirements
Insulation Level According to applicable standard and system voltage
Standards IEC 60076 / IEEE / ANSI
Service Life Designed for long-term continuous operation
Altitude ≤1000m standard; higher altitude available
Ambient Temperature Standard design; customized for special climates
Typical 132kV / 138kV Voltage Configurations
Application Typical Voltage Ratio
Utility Substation 132/33kV
Distribution Substation 132/11kV
Industrial Substation 132/13.8kV
Renewable Energy 138/34.5kV
North American Grid 138/13.8kV
Customized Project 132/XXkV / 138/XXkV
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
Utility Substations
Used for:
Transmission substations
Distribution substations
Grid interconnection
Sub-transmission networks
Power Generation
Suitable for:
Thermal power plants
Hydropower plants
Solar power plants
Wind farms
Gas power plants
Hybrid energy systems
Renewable Energy
132kV / 138kV transformers can be used as grid step-up transformers for large renewable-energy projects.
Typical system:
PV / Wind Generation → Collector System → Step-Up Transformer → 132/138kV Grid
Industrial Power Systems
Suitable for large:
Mining projects
Steel plants
Cement plants
Petrochemical facilities
Manufacturing complexes
Industrial parks
A 132kV / 138kV Power Transformer is a high-voltage oil-immersed transformer used in transmission and substation systems to step voltage up or down between high-voltage and medium-voltage networks.
The transformer can be designed from 10 MVA to 200+ MVA, depending on the project requirements. Customized MVA ratings are available for utility, EPC, industrial, and renewable-energy projects.
Typical configurations include:
132/11kV
132/33kV
138/13.8kV
138/34.5kV
132/34.5kV
Other voltage ratios can be customized according to grid requirements.
Yes. The transformer can be designed for 50Hz or 60Hz operation according to the destination country’s grid frequency.
Yes. An On-Load Tap Changer (OLTC) can be installed to regulate the output voltage while the transformer is energized.
The tap range and number of positions can be customized according to the utility or EPC specification.
Depending on the rated capacity, the transformer can use:
ONAN — Oil Natural Air Natural
ONAF — Oil Natural Air Forced
OFAF — Oil Forced Air Forced
OFWF — Oil Forced Water Forced
The transformer can be manufactured with high-quality copper or aluminum windings. Copper is commonly selected when high mechanical strength and lower winding resistance are required.
The transformer can use mineral insulating oil or ester-based insulating fluid, depending on project specifications, environmental requirements, and customer preferences.
Yes. Special designs can be provided for:
High-altitude locations
Tropical climates
Desert environments
High-humidity areas
Coastal and salt-spray environments
Dusty industrial sites
Mining applications
Seismic areas
The transformer can be equipped with:
Buchholz relay
Pressure relief device
Oil temperature indicator
Winding temperature indicator
Magnetic oil level gauge
Silica gel breather
Surge arrester
OLTC protection
Online monitoring system
For utility and EPC projects, optional systems include:
Online DGA • Moisture Monitoring • Bushing Monitoring • OLTC Monitoring • Temperature Monitoring • RS485 / Modbus • IEC 61850 • SCADA Integration
The transformer can be designed according to applicable IEC 60076, IEEE, ANSI and other customer-specified standards.
The exact standard and technical requirements should be confirmed during project engineering.
Routine factory tests typically include:
Winding resistance
Voltage ratio
Vector group
No-load loss
Load loss
Impedance
Applied voltage
Induced voltage
Insulation performance
OLTC operation
Oil testing
Additional type tests, special tests and FAT can be arranged according to project requirements.
Yes. Customer inspection, third-party inspection and Factory Acceptance Testing (FAT) can be supported according to the approved Inspection & Test Plan.
Yes. Depending on project requirements, documentation can include:
Technical Datasheet
General Arrangement Drawing
Foundation Drawing
Bushing Arrangement
Wiring Diagram
Control Diagram
Nameplate Drawing
Test Reports
Installation Manual
Operation Manual
Quality Documents
Yes. The transformer can be engineered according to the customer’s technical specification, utility requirements, grid code, approved drawings and applicable international standards.
Large power transformers are normally transported as dedicated project cargo. Depending on the design, radiators, bushings, conservator tanks, cooling equipment and other accessories may be shipped separately for site assembly.
They are suitable for:
Utility substations
Transmission networks
Power plants
Solar power plants
Wind farms
Industrial substations
Mining projects
Grid interconnection projects
Large infrastructure projects
132kV / 138kV • Custom MVA • OLTC • Utility Grade • EPC Support • Factory Tested
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