HuaZheng Electric Manufacturing (Baoding) Co.,Ltd is the supplier of the State grid in China.

Huazheng supplied the electric equipment to the government of China , Products are used by 

more than 20 provinces in China. We also export to other countries, like Brazil, Chile, Malysia, Vietnam and other countries. We supplied the transformer tester for the big power station, We also supplied the transformer oil tester, like transformer oil dielectric tester (BDV tester), transformer losstester, transformer oil acid tester, flash point tester and so on. The products Huazheng supplied as follows:

Transformer tester, Cable fault locator, Power quality analyzer, transformer oil tester,High voltage tester, Insulation tester, Earth resistance tester and so on.

More detail,please contact us 

VLF (Very Low Frequency) Testers are suitable for testing power cables, transformers, switchgear, rotating machinery and other electrical apparatus.

The product combines modern advanced digital variable frequency technology and micro computer control together,  therefore, it can realize the full automatic voltage boost, stepdown, measurement and protection as well as the manual  intervention in the process of automatic voltage boost. The full electronic design ensures the small size and light weight. The big LCD screen ensures the clear and visual display, and can display the output sinusoidal wave form. The printer  outputs test reports. In addition, the product has features as follows:

1. Data of current, voltage, wave form can be directly sampled at high voltage side, so the data is real and accurate.

2. Overvoltage protection: If the output exceeds the set limit of voltage, the instrument will shut-down to protect itself, the actuation time is less than 20ms.

3. Overcurrent protection: It is high-low voltage dual protection in the design, the accurate shut-down protection can be made according to the set value at high voltage side; If the current on low voltage side exceeds the rated current, the instrument will take shut-down protection, the actuation time are both less than 20ms.

4. A high voltage output protective resistor is provided in the voltage boost body in the design and this eliminates the need of additional protective resistor connected outside

   hipot insulation resistance tester Technical parameters:

From the date of purchase within one year instrument, is a product quality problem free repair replacement, lifetime supply of maintenance and technical services. The instrument has found anomalies or malfunctions please contact us to arrange the most convenient treatment options.