The Testing Center of Nanjing Electric (Group) Co., Ltd. was established in April 2009. In September 2019, it successfully passed a re‑inspection at the new manufacturing base of Nanjing Electric Technology Co., Ltd., located in a national high‑tech development zone. The center primarily undertakes quality control during the production process, testing of new materials, product development and type‑approval testing, as well as quality inspection for product installation, repair, and modification. In 2016, a state‑of‑the‑art laboratory facility was completed in the Xingang Development Zone, and the center is currently in discussions with KEMA Laboratories regarding potential collaboration.

Scope of business: porcelain and glass insulator strings, string assemblies and their components for high-voltage transmission lines; high-voltage post insulators; high-voltage bushings; high-voltage insulators; high-voltage disconnect switches and earthing switches; current transformers; voltage transformers; and other high-voltage electrical equipment. Additionally, we offer eight product series of rod-type suspended composite insulators for AC overhead transmission lines. Our products are tested at AC voltage levels ranging from 1 kV to extra-high voltage 1200 kV, and at DC voltage levels from ±10 kV to ±2400 kV.

The laboratory currently employs 23 staff members, including 8 engineering and technical personnel. It boasts fixed assets totaling RMB 29.8 million, a total floor area of 10,317 square meters, and 105 major testing instruments and equipment, making it one of the high‑voltage laboratories in East China with the most comprehensive array of testing equipment and the highest test voltages.

Ultra-High Voltage Shielding Laboratory (72 m × 40 m × 40 m) 2,880 m²

Main test equipment: 1500 kV power-frequency test transformer, 1500 V standard capacitor, 4400 kV impulse voltage measurement system, ±2400 kV DC high-voltage generator, bending load testing apparatus, 50,000 A high-current testing apparatus, rain‑exposure testing apparatus, digital partial discharge meter, precision high‑voltage capacitance bridge, and others.

500 kV Ultra-High-Voltage Shielding Laboratory (63 m × 40 m × 26.4 m) 2,520 m²

Main test equipment: a 1000 kV test transformer, a 1000 kV standard capacitor, a 3000 kV impulse voltage measurement system, and a ±500 kV DC high-voltage generator, among others.

Glass Insulator Laboratory (72 m × 24 m × 11 m) 1,728 m²

Main test equipment: radio interference measurement chamber, 1000 kN thermal‑mechanical testing machine, 1000 kN tensile testing machine, 3000 kN tensile testing machine, 300 kV AC/DC test transformer, ion migration test system, thermal‑shock cycling chamber, thermal‑vibration oven, and others.

Composite Insulator Laboratory (48 m × 38 m × 22.6 m) 1,824 m²

Main testing equipment: 1000 kN and 2000 kN horizontal tensile testing machines, a 1400 kV impulse voltage test setup, a 500 kV AC/DC test transformer, a 50 kN bending‑torsion testing machine, a JN‑SC water‑boiling tank, a CZF‑3 horizontal‑vertical flame‑spread tester, a hot‑state flexural strength testing machine, and others.

Dry-Type Bushing Test Laboratory (35 m × 20 m × 15.5 m) 700 m²

Main test equipment: a 1800 kV impulse voltage test system, a 600 kV AC test transformer, a 600 kV standard capacitor, and other key testing devices and instruments.

The Institute of Materials Technology conducts research on fundamental materials and methodological technologies, as well as experimental studies in materials characterization, including chemical analysis, physical analysis, and electrical property testing.

Main test equipment: 30 kN/Class 0.5 electronic universal testing machine, electronic pressure testing machine, rubber vulcanization analyzer, atomic absorption spectrophotometer, Fourier‑transform infrared spectrometer, thermal analyzer, autoclave, durometer, 100 kV AC/DC withstand voltage tester, viscometer, gel time tester, video contact angle meter, and various other material‑testing instruments, along with common chemical laboratory apparatus and equipment, to meet the performance analysis and testing requirements of both organic and inorganic materials.