I. Project Overview

This project involves Nanke Electric delivering, installing, commissioning, and putting into operation test equipment for Junlang Electric Co., Ltd. Junlang Electric was founded in 2009 in Yueqing City, Wenzhou, Zhejiang Province, specializing in the R&D, production, and sales of high- and low-voltage electrical equipment, with flagship products including the S20 series energy-saving transformers and Scb13 epoxy resin cast dry-type transformers.

To address the issues of cumbersome operations and low efficiency in traditional transformer testing, we have deployed a fully automated distribution transformer testing system to meet the company’s requirements for factory acceptance testing.

II. Maximum Testing Capacity

The system operates at frequencies of 50–60 Hz and can perform tests on transformers with various voltage levels, capacities, and impedance parameters, offering broad compatibility. Specific parameters are as follows:

High voltage: 6 kV; low voltage: 0.4 kV/0.8 kV; maximum test capacity: 3,150 kVA; compatible impedance: 4%–6%.

High voltage: 10 kV; low voltage: 0.4 kV/0.8 kV; maximum test capacity: 6,300 kVA; compatible impedance: 4%–8%.

High voltage: 20 kV; low voltage: 0.4 kV/0.8 kV; maximum test capacity: 6,300 kVA; compatible impedance: 5%–8%.

High voltage: 35–38.5 kV; low voltage: 0.4 kV/0.69 kV/0.8 kV/1.14 kV; maximum test capacity: 6,300 kVA; compatible impedance: 6%–10%.

Single-phase transformers: rated capacity up to 333 kVA; high-voltage side supports 34.5 kV, 23 kV, and 13.8 kV; low-voltage side ≤ 0.48 kV; impedance voltage: 2%–6%.

III. Test Items

With its high level of integration, this system can complete all six standard transformer tests in one go, comprehensively covering all mandatory factory inspection items:

(1) No-load test; (2) Load test; (3) Induction test; (4) Temperature-rise test; (5) Partial discharge test; (6) Power-frequency withstand voltage test.

IV. Project Highlights

(1) Fully automated operation throughout the entire process—single wiring suffices to complete all tests, significantly improving quality and efficiency.

The system supports single-wire connection and eliminates the need for disassembly during the entire testing procedure. After staff enter basic parameters such as transformer capacity and voltage, the equipment automatically switches current transformer ranges, adjusts the voltage regulator, and executes the test sequence. Test data is recorded automatically throughout, and upon completion, a test report can be directly exported, reducing manual intervention.

(2) Intelligent data management ensures precise and traceable test results.

Equipped with high-precision data acquisition modules and power analysis units, the system displays real-time data on voltage, current, power, frequency, impedance, losses, and more, and can automatically convert data under rated operating conditions and standard temperatures. The system also supports data locking, local storage, and historical record retrieval, facilitating product quality traceability and documentation retention.

(3) Strong adaptability, covering testing of all product categories.

With a wide range of voltage, capacity, and impedance compatibility, the system is compatible with mainstream products such as Junlang’s S20 energy-saving transformers and Scb13 dry-type transformers, while also supporting single-phase transformer testing. A single set of equipment can meet routine quality inspection needs within the plant, demonstrating strong practicality.

V. Commissioning Information

Client Company: Junlang Electric Co., Ltd.

Commissioning Date: April 2026.