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 133kV 135kV Three-Phase Power Transformer is designed for high-voltage substations and medium-to-large power transmission and distribution systems.
It converts high-voltage electrical power to the required medium- or low-voltage level for subsequent transmission, distribution, or industrial use. The transformer can be engineered according to different grid configurations, environmental conditions, load characteristics, and international technical standards.
The transformer adopts a robust oil-immersed construction with a high-efficiency magnetic core, optimized HV/LV winding arrangement, reliable insulation system, and advanced cooling configuration.
It is suitable for:
Engineered for 133kV / 135kV class high-voltage applications, with insulation systems designed according to project-specific requirements.
Optimized magnetic core and winding design help reduce:
The winding structure is mechanically reinforced to withstand electromagnetic forces generated during short-circuit conditions.
High-quality insulation materials and carefully controlled manufacturing processes provide reliable dielectric performance and long service life.
Cooling configuration can be selected according to transformer capacity and operating conditions, including:
Depending on the application, the transformer can be equipped with:
The tap range can be customized according to the grid voltage regulation requirements.
Transformer parameters can be customized for EPC, utility, industrial, renewable energy, and infrastructure projects.
The 133kV / 135kV Three-Phase Power Transformer is engineered for high-voltage substations, utility networks, industrial power systems, and large-scale renewable energy projects. Technical parameters can be customized according to the project specification and applicable international standards.
| Item | Technical Specification |
|---|---|
| Product Type | Three-Phase Oil-Immersed Power Transformer |
| Rated Voltage Class | 133kV / 135kV |
| High Voltage | 133kV / 135kV |
| Medium Voltage | 33kV / 13.8kV / 11kV / Customized |
| Low Voltage | Customized |
| Rated Capacity | 5MVA–250MVA+ / Customized |
| Frequency | 50Hz / 60Hz |
| Phase | Three Phase |
| Cooling Type | ONAN / ONAF / OFAF |
| Tap Changer | OCTC / OLTC |
| Tap Range | Typically ±2 × 2.5% / ±8 × 1.25% / Customized |
| Vector Group | Dyn11 / YNd11 / YNd1 / Customized |
| Impedance Voltage | Customized according to project requirements |
| Winding Material | Copper / Aluminum |
| Core Material | High-Grade Grain-Oriented Silicon Steel |
| Insulation Medium | Mineral Transformer Oil / Customized |
| Neutral Configuration | Solidly Grounded / Resistance Grounded / Customized |
| Installation | Outdoor / Indoor |
| Temperature Rise | According to applicable standard |
| Noise Level | According to applicable standard |
| Altitude | Standard / High-Altitude Design Available |
| Ambient Temperature | Standard / Customized for Extreme Climates |
| Insulation Level | According to IEC / ANSI / IEEE requirements |
| Short-Circuit Withstand | Designed according to IEC 60076-5 / Project Specification |
| Protection | Buchholz Relay / Pressure Relief Device / Temperature Protection |
| Standards | IEC / ANSI / IEEE / GOST / Customer Specification |
| Service | OEM / ODM / Custom Engineering |
The transformer can be configured for different substation voltage levels, including:
The transformer can be optimized according to the required:
For 133kV/135kV-class applications, the insulation system can be designed according to the specified:
ONAN — Oil Natural Air Natural
Suitable for transformers with relatively moderate capacity and natural heat dissipation requirements.
ONAF — Oil Natural Air Forced
Cooling fans increase heat dissipation and allow higher transformer loading capacity.
OFAF — Oil Forced Air Forced
Forced oil circulation and forced-air cooling can be used for higher-capacity transformers.
OCTC — Off-Circuit Tap Changer
Suitable where voltage adjustment is required only when the transformer is de-energized.
OLTC — On-Load Tap Changer
Suitable for substations requiring continuous voltage regulation while the transformer remains energized.
The tap position, range, control system and motor-drive mechanism can be customized according to grid requirements.
For EPC and utility projects, the technical design can be customized based on:
Grid Voltage → Capacity → Load Profile → Short-Circuit Level → Cooling → Tap Regulation → Insulation Level → Environmental Conditions → Applicable Standard
This allows the 133kV / 135kV transformer to be configured specifically for each substation rather than using a one-size-fits-all design.
Technical Note: Final specifications should be confirmed against the project single-line diagram, utility technical specification, required capacity, system short-circuit level, voltage regulation requirements and applicable standard before production.
Zisheng can customize the transformer according to the customer's electrical and mechanical requirements.
For projects located in challenging environments, the transformer can be engineered for:
The transformer is prepared according to its transportation dimensions, weight, destination, and project requirements.
Typical delivery preparation includes:
For large transformers, transportation plans can be coordinated according to:
Shipping documents can include:
Direct manufacturer supply helps EPC contractors and distributors control procurement costs and project schedules.
Transformer specifications can be engineered according to voltage, capacity, grid requirements, environmental conditions, and applicable standards.
Products can be manufactured and tested according to IEC, ANSI/IEEE, GOST, and customer-specific requirements.
Technical support can cover the process from specification confirmation → engineering → manufacturing → testing → packaging → delivery.
Each transformer undergoes strict manufacturing quality control and testing before shipment.
Typical manufacturer testing includes:
All test requirements can be aligned with the customer's technical specification and applicable international standards.
Before delivery, routine tests are performed according to the applicable standards and project requirements.
Typical routine tests include:
Factory test reports can be provided for customer and EPC project documentation.
The transformer can be manufactured according to different international standards depending on the target market.
IEC
Other Standards
For EPC projects, the manufacturing and testing requirements can be matched to the project's technical specification.
Used for high-voltage grid transmission and distribution networks, supporting reliable power delivery between transmission and distribution voltage levels.
Suitable for large industrial facilities requiring high-capacity and stable power supply.
Can be integrated into:
Designed for demanding mining environments where high reliability and robust construction are required.
Suitable for airports, railways, ports, water treatment facilities, and other large infrastructure projects.
For EPC contractors, the product can be supplied as part of a complete transformer solution rather than simply as a standalone transformer.
This makes the 133kV / 135kV transformer suitable for utility, EPC, industrial and infrastructure projects requiring customized high-voltage substation equipment.
It is a high-voltage three-phase transformer designed for substations and power transmission/distribution systems operating around the 133kV or 135kV voltage class.
Yes. Capacity, voltage ratio, impedance, vector group, tap changer, cooling system, insulation level, accessories, and other parameters can be customized.
Yes. 133kV/33kV is one of the possible voltage configurations. Other voltage ratios can also be manufactured according to the project requirements.
Yes. A 135kV/33kV three-phase transformer can be designed and manufactured according to the required capacity and technical specification.
Yes. An on-load tap changer (OLTC) can be supplied where automatic voltage regulation is required.
Depending on the capacity and application, options can include ONAN, ONAF and OFAF.
IEC, ANSI/IEEE, GOST and other customer-specified standards can be supported.
Yes. Routine test reports and other required inspection/test documentation can be provided according to the project requirements.
133kV 135kV Three-Phase Power Transformer – High Voltage Substation Equipment