1. Project Overview

This project is custom-designed by Nanke Electric for Wuxi Yineng Power, and it belongs to the second part of their 2025 eighth intelligent test station. It is an offline large-capacity three-phase transformer intelligent testing system capable of completing all factory acceptance tests for oil-immersed and dry-type transformers up to 25 MVA. This system is suitable for offline large-capacity testing scenarios, meeting the factory quality control requirements for high-capacity transformers in fields such as rail transit, power transmission and distribution, and new energy, thereby helping customers achieve intelligent and standardized testing.

2. Maximum Testing Capacity

Offline Large-Capacity Test Area for Oil-Immersed/Dry-Type Transformers: Transformer capacity: 25,000 kVA; Primary voltage: 35.00 kV; Secondary voltage: 0.4–10.00 kV; Short-circuit impedance: 6.00%–14.00%;

Transformer capacity: 16,000 kVA; Primary voltage: 20.00 kV; Secondary voltage: 2 kV and below; Short-circuit impedance: 6.00%–10.00%;

Transformer capacity: 6,300 kVA; Primary voltage: 10.00 kV; Secondary voltage: 2 kV and below; Short-circuit impedance: 10% and below.

3. Test Items

1. Insulation resistance test;

2. DC resistance test;

3. Turns ratio and connection group test;

4. No-load test: no-load loss, power factor measurement, and no-load current percentage test;

5. Load test: load loss (automatically converted to values at 75°C, 120°C, and 145°C), short-circuit impedance percentage;

6. Induced withstand voltage test;

7. Power frequency withstand voltage test;

8. Temperature rise test;

9. Partial discharge test;

10. Sound level measurement.

4. Project Highlights

Full Coverage of Large Capacities: Supports comprehensive testing for oil-immersed and dry-type transformers up to 25 MVA, compatible with multiple voltage levels up to 35 kV, meeting the needs of large-capacity testing.

One-Stop Comprehensive Testing: Covers 10 core test items, enabling complete factory acceptance testing in a single session without requiring separate setups or scenario-based testing.

Intelligent and Efficient: Automatically converts load loss values across multiple temperature points, eliminating manual calculations, ensuring precise and compliant data, and significantly improving testing efficiency.

Adapted for Offline Scenarios: Specifically designed for offline large-capacity test areas, featuring a well-planned layout and convenient operation that aligns with on-site testing workflows.

Mature Delivery: Leveraging proven technical solutions, rapid customized implementation, and providing integrated services including installation, commissioning, and training.

5. Commissioning Information

Client: Wuxi Yineng Power Equipment Co., Ltd.

Commissioning Date: March 2026

Commissioning Date: April 2026