With the continuous development of power infrastructure, reliable substation commissioning and testing have become essential steps before high-voltage equipment is connected to the power grid.

Recently, Sansion Power participated in a 220kV substation field testing project, providing high voltage testing equipment to support on-site commissioning activities.

This project demonstrated the importance of accurate electrical testing during substation construction and commissioning, helping engineers verify equipment performance and prepare the system for safe operation.

A high-voltage substation contains multiple critical electrical components, including transformers, cables, switchgear, GIS, and protection systems.

Before energization, these components require comprehensive testing and verification to ensure they meet technical requirements and operate reliably under actual working conditions.

During this project, Sansion Power’s high voltage testing equipment was applied on site to support the testing process and provide reliable measurement data for engineers.

During substation commissioning, engineers typically need to perform various electrical tests to evaluate equipment condition and insulation performance.

Common testing requirements include:

High voltage insulation testing helps verify whether electrical equipment can withstand specified voltage stresses before being put into service.

Typical applications include:

• High voltage switchgear testing
• Transformer insulation testing
• Cable withstand voltage testing
• GIS insulation evaluation

Withstand voltage testing is one of the key procedures during electrical equipment commissioning.

By applying controlled high voltage, engineers can evaluate insulation strength and confirm that equipment meets operational requirements.

Sansion Power provides high voltage test systems suitable for different power equipment testing applications.

Unlike laboratory testing, substation field testing requires equipment with good mobility, reliability, and adaptability to complex site environments.

High voltage testing equipment used for field applications needs to consider:

• Transportation requirements
• Site installation conditions
• Measurement accuracy
• Operation safety