I. Project Overview

This project is the first fully automatic intelligent transformer testing system customized by Nanke Electric for Zhejiang Power Transformer Co., Ltd. in 2021. The customer is a national high-tech enterprise and a national “Little Giant” specialized, refined, distinctive, and innovative enterprise, mainly engaged in oil-immersed power transformers of 110kV and below, dry-type power transformers of 35kV and below, as well as high- and low-voltage switchgear and box-type substations. The system is specifically designed for the oil-immersed transformer production line test area, enabling fully automated operation of the testing process, precise data collection, and standardized output of test reports, significantly improving the customer’s factory inspection efficiency and product quality control level.

II. Maximum Testing Capacity

Oil transformer production line test area: Power transformers

Capacity range: 30kVA–2500kVA

Voltage level: Primary 20.00kV, Secondary 0.4kV

Short-circuit impedance: 10% and below

III. 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 (automatic conversion at 75℃, 120℃, 145℃), short-circuit impedance percentage test

(6) Induced withstand voltage test

(7) Power frequency withstand voltage test

IV. Project Highlights

(1) Fully automated assembly line operation: Supports one-time wiring, completes the entire testing process automatically, efficiently coordinates with the production line, and greatly enhances testing efficiency.

(2) Comprehensive coverage across wide specifications: Covers the full capacity range from 30kVA to 2500kVA, meeting the batch testing needs of multiple product models.

(3) Intelligent automatic temperature conversion: Supports automatic conversion at multiple temperature points—75℃, 120℃, and 145℃—ensuring accurate data that meets standard requirements.

(4) Routine factory tests for transformers: Completes all items—including insulation, DC resistance, turns ratio, no-load, load, induced withstand voltage, and power frequency withstand voltage—in one stop.

(5) High precision, stability, and reliability: Equipped with professional power analyzers, providing accurate test data with strong anti-interference capabilities, ensuring authoritative and traceable results.

V. Commissioning Information

Customer: Zhejiang Power Transformer Co., Ltd.

Commissioning time: 2021

Operating status: Officially commissioned and operating stably over the long term

VI. Customer Feedback

Since using this system in 2021, the customer has highly recognized both the equipment and services, and in 2026 even made an additional purchase of industrial control computers. The system operates stably, significantly reducing manual workload, while service responses are timely and efficient. The customer explicitly stated that they will prioritize choosing Nanke Electric products in the future.