Outdoor Oil-Immersed Power Transformer — Substation Main Transformer Supply Project

▎Overview

This project supplies outdoor oil-immersed power transformers for regional grid substations. The units feature a sealed oil tank, panel radiators, conservator tank, HV bushings and pressure/temperature monitoring instruments, designed for harsh outdoor conditions (extreme cold, sand, wide temperature range). Oil-immersed transformers deliver superior cooling and insulation, providing large-capacity, long-term reliable main-transformer duty for regional grids and industrial users.

▎Requirements

Customers face the following needs and challenges in the construction of substations:

• Large capacity stable power supply: As the main transformer of the substation, it needs to bear large capacity loads for a long time to ensure the continuous and stable operation of the power grid.

• Outdoor environment adaptation: Located in areas with severe cold, sandstorms, and large temperature differences, the equipment needs to meet the requirements of all-weather outdoor operation and anti pollution.

• Heat dissipation and insulation: Efficient heat sinks and high-quality insulation oil are required to ensure controlled temperature rise under full load and overload conditions.

• Operational safety: Comprehensive pressure, oil level, and temperature monitoring and protection are required to ensure equipment safety and grid stability.

▎Solution

Zhejiang Shuntong Electric provides a complete set of outdoor oil immersed power transformer solutions:

• Fully sealed fuel tank: adopting a fully sealed structure to isolate external moisture and delay the aging of insulation oil.

• Plate type radiator: A large heat dissipation area plate type radiator group with efficient heat dissipation through natural oil circulation (ONAN), meeting the requirements of large capacity temperature rise.

• Oil pillow (oil storage tank) and respiratory system: equipped with oil pillow and oil level/pressure monitoring to adapt to changes in oil temperature and outdoor operation.

• High pressure casing and monitoring instruments: High pressure casing+pressure gauge/temperature gauge, real-time monitoring of operating status to ensure safety.

▎Implementation

• Design selection: Determine the transformer scheme based on the substation capacity, voltage level, and outdoor environment.

• Production and testing: Complete coil winding, body assembly, oil injection, and routine/type testing.

• On site installation: foundation positioning, body inspection, oil injection/treatment, conduit and cable connection, grounding construction.

• Debugging and commissioning: Complete on-site tests and protection linkage for transformation ratio, insulation, temperature rise, etc., and deliver after confirming normal operation.

▎Value Delivered

• Improved power supply reliability: Large capacity main transformer+stable heat dissipation, ensuring continuous and reliable power supply to the substation.

• Strong environmental adaptability: fully sealed and anti pollution design, suitable for outdoor environments such as severe cold, sandstorms, and large temperature differences.

• Enhanced operational safety: Improved oil level/pressure/temperature monitoring to reduce the risk of malfunctions and shutdowns.

• Optimization of operation and maintenance costs: mature and reliable, easy to maintain, reducing long-term operation and maintenance investment.

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