Project Overview
A customized 220kV Power Transformer was supplied for a high-voltage grid substation project, providing reliable voltage transformation between the transmission network and the downstream power system.
The project required a high-capacity transformer capable of stable continuous operation under demanding grid conditions, with reliable insulation performance, efficient cooling, flexible voltage regulation, and comprehensive protection.
Project Requirements
The project required the transformer to meet the following key requirements:
220kV high-voltage transmission system
High-capacity three-phase transformer
Stable long-term outdoor operation
High short-circuit withstand capability
Reliable high-voltage insulation system
On-load voltage regulation
Efficient heat dissipation and cooling
Comprehensive transformer protection
Factory acceptance testing before shipment
Export-ready packing and transportation
Customized Technical Solution
Zisheng developed the transformer configuration according to the project's electrical and environmental requirements.
The solution included:
220kV High-Voltage System
The high-voltage winding and insulation system were designed according to the specified voltage and insulation requirements of the substation.
On-Load Tap Changer
An OLTC system was configured to provide flexible voltage regulation and help maintain stable output voltage under varying grid conditions.
Optimized Cooling System
The cooling system was selected according to the transformer's rated capacity and thermal requirements, with radiator and fan configurations customized for reliable continuous operation.
Reinforced Winding Structure
The winding and mechanical support system were designed to withstand electromagnetic forces generated during short-circuit conditions.
Comprehensive Protection
The transformer can be equipped with Buchholz relay, pressure relief device, oil and winding temperature indicators, oil level monitoring, and other protection components according to the project specification.
Optional Online Monitoring
For critical substations, online monitoring solutions such as dissolved gas analysis, bushing monitoring, and transformer condition monitoring can be integrated.
Manufacturing & Quality Control
Before shipment, the transformer underwent factory inspection and testing according to the agreed technical specification and applicable standards.
The testing program can include:
Winding resistance test
Voltage ratio and vector group test
No-load loss and current test
Load loss and impedance test
Applied voltage test
Induced voltage test
Insulation performance verification
Tap changer operation test
Oil leakage test
Additional type and special tests when required
Factory acceptance testing can also be arranged with customer representatives, EPC contractors, consultants, or third-party inspection agencies.
Delivery & Project Support
After successful factory testing, the transformer was prepared for international transportation with suitable export protection and project documentation.
The project supply can include:
Main transformer
OLTC system
Cooling equipment
High-voltage and low-voltage bushings
Protection devices
Transformer monitoring equipment
Technical drawings
Test reports
Operation and maintenance documentation
Export packing and shipping support
Project Value
The 220kV Power Transformer solution provides the substation with a reliable high-voltage transformation system designed for long-term grid operation.
Through customized engineering, controlled manufacturing, factory testing, and project-oriented delivery, Zisheng supports EPC contractors, utilities, power developers, and industrial customers with high-voltage transformer solutions for demanding power infrastructure projects.
