zishengelectric
Project Partners
Phone/WhatsApp: 8619131285373
Email: info@zishengtransformer.com
Factory Headquarters: No. 118, Jingyi Street, Economic Development Zone.
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Project Partners
Phone/WhatsApp: 8619131285373
Email: info@zishengtransformer.com
Factory Headquarters: No. 118, Jingyi Street, Economic Development Zone.
The 132kV / 138kV Power Transformer is a high-voltage oil-immersed transformer designed for utility substations, power generation plants, industrial power networks, renewable energy projects, and large-scale transmission and distribution systems.
It is engineered to provide reliable voltage transformation between high-voltage transmission networks and medium- or low-voltage distribution systems. Depending on the project, the transformer can be configured as a step-up or step-down transformer with customized capacity, voltage ratio, vector group, impedance, cooling system, tap changer and protection system.
Typical configurations include:
Rated capacity can be designed from several MVA to tens or hundreds of MVA, depending on the application and grid requirements.
| Parameter | Typical Specification |
|---|---|
| Product Type | High Voltage Oil-Immersed Power Transformer |
| Rated Capacity | Customized, typically 10–200+ MVA |
| Primary Voltage | 132kV / 138kV |
| Secondary Voltage | 11kV / 13.8kV / 33kV / 34.5kV / Customized |
| Frequency | 50Hz / 60Hz |
| Phase | Three Phase |
| Cooling Method | ONAN / ONAF / OFAF / OFWF |
| Winding Material | Copper / Aluminum |
| Tap Changer | OLTC / Off-Circuit Tap Changer |
| Vector Group | Dyn11 / YNd11 / YNyn0 / Customized |
| Neutral | Solid / Resistance / Reactance Grounded, as required |
| Insulation Medium | Mineral Oil / Ester Fluid |
| Oil Preservation | Conservator / Sealed Type |
| Core Material | High-Grade Grain-Oriented Electrical Steel |
| Frequency | 50 / 60Hz |
| Installation | Outdoor / Indoor |
| Insulation Level | According to system voltage and applicable standard |
| Standards | IEC 60076 Series / IEEE / ANSI or Customized |
| Accessories | Buchholz Relay, PRD, OTI, WTI, MOG, etc. |
| Monitoring | Optional Online Monitoring System |
Note: Final electrical parameters must be determined from the customer's technical specification, grid code, utility requirements and transformer design.
Designed for 132kV and 138kV transmission and sub-transmission networks, with insulation systems engineered for high electrical stress and long-term reliability.
Optimized magnetic core and winding design reduces:
The winding structure is mechanically reinforced to withstand the electromagnetic forces generated during short-circuit conditions.
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.
Different cooling configurations can be selected according to transformer capacity and operating conditions:
ONAN → ONAF → OFAF / OFWF
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.
The core is manufactured from high-quality grain-oriented electrical steel.
Typical design features include:
The core is carefully clamped to maintain mechanical integrity during transportation and operation.
The HV winding is designed specifically for high-voltage electrical stress.
The design considers:
Depending on the capacity and voltage class, different winding structures can be selected.
The secondary winding can be configured for common substation voltages such as:
11kV • 13.8kV • 33kV • 34.5kV
Customized voltage ratios are also available.
The transformer tank is manufactured from high-strength steel and designed to withstand:
The tank can be subjected to leakage and pressure testing before shipment.
For 132kV / 138kV power transformers, an OLTC can be provided for automatic voltage regulation.
Typical options include:
The actual tap range and number of positions are customized according to the grid specification.
The OLTC can be integrated with:
The cooling system is selected according to transformer capacity and project requirements.
Oil Natural Air Natural
Suitable for transformers where natural oil and air circulation can provide sufficient cooling.
Oil Natural Air Forced
Cooling fans increase heat dissipation and improve the transformer's load capability.
Oil Forced Air Forced
Oil pumps and cooling fans are used for larger-capacity transformers.
Oil Forced Water Forced
Suitable for specific high-capacity or special installation environments.
A complete 132kV / 138kV transformer can be equipped with comprehensive protection and monitoring devices.
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:
For coastal, desert or heavily polluted environments, an increased creepage distance can be considered.
The transformer can use:
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.
132kV / 138kV transformers require comprehensive factory testing before shipment.
Typical routine testing includes:
Depending on the project:
For utility and EPC projects, FAT / third-party inspection can be arranged according to the approved Inspection & Test Plan.
Due to the size and weight of 132kV / 138kV transformers, transportation is normally planned as a dedicated project.
Typical shipping preparation includes:
Factory Testing → Pre-Shipment Inspection → Oil Treatment / Oil Draining as Required → Component Protection → Secure Fixation → Loading → International Transportation
Depending on transformer size, components such as:
may be shipped separately and assembled at the project site.
Export documentation can include:
Used for:
Suitable for:
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
Suitable for large:
132kV HV → 33kV MV
50/60Hz • 3 Phase • Oil Immersed • ONAN/ONAF • OLTC
Suitable for utility substations and industrial power distribution.
138kV HV → 34.5kV MV
50/60Hz • 3 Phase • Oil Immersed • ONAN/ONAF
Suitable for North American-style utility and renewable-energy projects.
132kV HV → 11kV MV
Suitable for regional substations and industrial distribution networks.
For your independent website, I recommend positioning this product around “high-voltage transmission + customized engineering + EPC project support”, rather than simply presenting it as a transformer product.
132kV / 138kV Power Transformer
High-Voltage Transmission & Grid Solutions10–200+ MVA | 132/138kV | IEC / IEEE / ANSI
Custom Voltage • OLTC • ONAN/ONAF • Utility & EPC Projects
Factory Tested • FAT Support • Global Delivery
This positioning is particularly suitable for EPC contractors, utilities, power-generation companies, renewable-energy developers and large industrial projects.
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.
| 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 |
| 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 |
The transformer can be equipped with:
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
Each transformer can be subjected to comprehensive factory testing, including:
Additional type tests, special tests, FAT and third-party inspection can be provided according to EPC or utility requirements.
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
The 132kV / 138kV Power Transformer can be custom-engineered according to utility, EPC, grid, renewable energy, and industrial project requirements. Key electrical, mechanical, protection, monitoring, and environmental parameters can be configured to match the project specification.
Typical tap ranges can be configured according to the grid specification, such as ±10%, ±12.5% or ±15%.
The cooling configuration can be selected according to transformer capacity and operating conditions:
High-voltage bushings can be selected according to:
Optional systems include:
The transformer can be engineered for demanding operating conditions:
High Altitude • Tropical Climate • Desert Environment • Coastal Areas • High Humidity • Heavy Pollution • Dusty Sites • High Temperature • Seismic Conditions
Customized anti-corrosion coating and increased creepage distance can be provided where required.
For large EPC and utility projects, the transformer can be supplied according to approved project documentation, including:
Customized project documentation can include:
Custom MVA • Custom Voltage • OLTC • Custom Cooling • Custom Protection • Utility & EPC Engineering
The 132kV / 138kV Power Transformer is prepared for international transportation with project-specific packing, component protection, lifting arrangements, and loading plans. Due to the large size and weight of high-voltage power transformers, the shipping method is customized according to the transformer design, destination, and site conditions.
Before shipment, the transformer is professionally protected against:
Typical protection includes:
Protective Film → Waterproof Covering → Moisture Protection → Reinforced Fixation → Export Shipping
The transformer tank and exposed components are properly protected during transportation.
Depending on the transformer design and transportation requirements, components may be packed and shipped separately, including:
Sensitive electrical components are individually protected and securely packed to minimize transportation damage.
Depending on transformer dimensions and weight, shipping can be arranged through:
For large transformers, transportation planning can include route surveys, lifting calculations, loading plans, and special transport arrangements.
Before dispatch, the transformer is securely fixed according to its:
Loading procedures may include:
Factory Loading → Heavy-Lift Handling → Transportation Fixation → Port Loading → Ocean Transportation → Destination Unloading
Complete export and project documentation can be provided, including:
For large 132kV / 138kV transformers, components shipped separately may require assembly at the project site.
Technical documentation can be provided for:
For EPC and utility projects, packing and transportation can be coordinated according to the project schedule and destination requirements.
Project Cargo • Heavy-Lift Transportation • Secure Packing • Component Protection • Global Delivery • EPC Logistics Support
Each 132kV / 138kV Power Transformer undergoes comprehensive routine testing before shipment to verify electrical performance, insulation integrity, mechanical condition, and operational reliability.
| Test Item | Purpose |
|---|---|
| Winding Resistance Test | Verifies winding resistance, conductor connections, and winding condition |
| Voltage Ratio Test | Confirms the actual transformation ratio at all tap positions |
| Vector Group & Phase Displacement Test | Verifies correct phase relationship and winding connections |
| No-Load Loss Test | Measures core loss at rated voltage and frequency |
| No-Load Current Test | Checks excitation current and magnetic core performance |
| Short-Circuit Impedance Test | Verifies impedance voltage and winding characteristics |
| Load Loss Test | Measures winding and additional load losses |
| Applied Voltage Test | Verifies main insulation withstand capability |
| Induced Voltage Test | Checks inter-turn and inter-layer insulation |
| Insulation Resistance Test | Evaluates insulation condition between windings and ground |
| OLTC Operation Test | Verifies tap changer operation throughout the specified range |
| Transformer Oil Test | Checks insulating oil quality and dielectric strength |
| Leakage / Pressure Test | Verifies tank sealing and oil-tightness |
| Control Circuit Test | Checks alarms, indicators, control circuits and auxiliary equipment |
For the 132kV / 138kV insulation system, routine testing focuses on:
Additional impulse and partial-discharge tests can be conducted when specified as type or special tests.
For transformers equipped with an On-Load Tap Changer, the following functions can be checked:
Before release for shipment, the transformer is also inspected for:
The actual measured values and test results are recorded in the Routine Test Report, which can be provided as part of the project quality documentation.
For EPC and utility projects, the testing can be performed according to the approved Inspection & Test Plan (ITP) and applicable IEC/IEEE requirements.
100% Routine Tested Before Shipment
Electrical Performance • Insulation Integrity • OLTC Verification • Oil Quality • Final Quality Inspection
The 132kV / 138kV Power Transformer is designed for high-voltage transmission, substation, power generation, and large-scale industrial applications. It provides reliable voltage transformation between 132/138kV transmission networks and medium-voltage distribution systems.
Used in:
Typical configurations include 132/11kV, 132/33kV, 138/13.8kV, and 138/34.5kV.
Suitable for voltage transformation and grid connection in:
The transformer can be configured as a step-up or step-down transformer according to the power system design.
The transformer can be used in utility-scale photovoltaic projects for grid connection.
Typical configuration:
PV Inverters → MV Collection System → Main Step-Up Transformer → 132/138kV Grid
Customization is available for:
Suitable for large wind farms and renewable-energy grid connection systems.
Typical system:
Wind Turbines → MV Collector Network → Main Transformer → 132/138kV Grid
The transformer can be engineered according to the project's grid code, reactive-power requirements, voltage regulation requirements, and environmental conditions.
Suitable for large electricity consumers and industrial facilities, including:
The transformer provides reliable high-voltage power distribution for large industrial loads.
For large mining and mineral-processing projects, the transformer can be customized for:
Additional protection and environmental design can be incorporated according to site conditions.
The 132kV / 138kV Power Transformer is suitable for:
Applications include:
The transformer can also be integrated into:
It provides the required voltage transformation between the MV collection system and 132/138kV transmission grid.
Power Generation / Renewable Energy
↓
MV Collection Network
↓
132kV / 138kV Power Transformer
↓
132kV / 138kV Substation
↓
Transmission / Distribution Grid
For EPC contractors and utilities, the transformer can be engineered according to:
Grid Code • Utility Specification • IEC / IEEE / ANSI • Site Conditions • MVA Capacity • Voltage Ratio • OLTC Requirements • Protection & Control • SCADA
Utility Substations • Solar Farms • Wind Farms • Power Plants • Mining • Industrial Facilities • Grid Interconnection
Custom-Engineered for High-Voltage Power Transmission Projects
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:
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:
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:
The transformer can be equipped with:
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:
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:
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:
132kV / 138kV • Custom MVA • OLTC • Utility Grade • EPC Support • Factory Tested
132kV 138kV Power Transformer