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YOANPOWER · HIGH VOLTAGE TESTING

High voltage.
Built for
your next test.

Test transformers and control systems for electrical insulation testing — from the laboratory to the field.

Discuss your requirements Explore equipment
Test transformers / Control systems / AC withstand testing
High voltage equipment and an engineer at a field installation
FROM EQUIPMENT TO APPLICATIONHigh voltage, in the field.
Product Center

Find the right test system.

Explore our core equipment for high voltage testing and transformer diagnostics.

hv category
CAT.02

High Voltage Test Equipment

HV generators, impulse generators, DC hipot testers.
resonant category
CAT.01

Series Resonant Test Equipment

AC withstand voltage testing for cables, GIS, transformers.
transformer category
CAT.03

Transformer Test Equipment

Turns ratio, winding resistance, short-circuit impedance.
View all product categories
Who We Are

One-Stop Power Test Equipment Factory

Yoanpower is the international trade brand of Wuhan Defu Electric, founded in 1983 in Wuhan — China's hub of high voltage testing. We integrate R&D, manufacturing, calibration and after-sales service for the global power industry.

Factory Direct

6,000 m² production base with in-house winding, assembly and calibration workshops. No middlemen, better prices.

R&D Driven

20+ engineers, 12 patents. OEM/ODM supported — custom voltage levels, frequencies and software on request.

Global Service

Exported to 60+ countries in Asia, Africa, Middle East & South America. 24-hour engineer response, on-site commissioning available.

40+Years of Experience
60+Countries Served
3,000+Sets Delivered
24hEngineer Response
Projects & Cases

Meet the people behind the equipment.

ECDC 2026 and IDEE SZ 2026 Energy Green Development Conference Shenzhen venue Live demonstration of Yoanpower high voltage test instruments at exhibition booth Hubei Yoan Electric team at Yoanpower booth 1C24, professional high voltage test equipment manufacturer

As a leading Chinese manufacturer of high voltage electrical test equipment, Yoanpower (Hubei Yoan Electrical Equipment Manufacturing Co., Ltd., est. 1983) exhibited at ECDC 2026 & IDEE SZ 2026 in Shenzhen, showcasing series resonant test systems, transformer test equipment, relay protection testers, cable fault locators and insulation resistance testers to customers from Southeast Asia, the Middle East, Africa and South America.

What do you need to test?

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