High Voltage Vlf-20kv to 90kv Very Low Frequency AC Hipot Test Equipment for Cable Withstand Voltage Testing

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.

1. Voltage (peak) 0-90kv, sensitivity: 0.1kV, accuracy: 1 %
2. Waveform: ultra-low frequency sine wave, DC voltage, positive and negative voltage peak error: ≤ 3%, voltage waveform
distortion: ≤ 1%
3. Frequency range: 0.1 Hz 0.05 Hz 0.02 Hz Load range (ultra-low frequency test): 10nF-10μF
4. Current: Measurement range: 0-70 mA, sensitivity: 1 μA, accuracy: 1 %
5. Dielectric loss.
Ultra low frequency sine wave voltage range: 1-80 kVrms
Load range: 50 nF - 5 μF
Resolution: not less than 1x10-6
Accuracy: not less than 1x10-3
Measurement range: 1x10-3 - 21000x10-3
Dielectric measurement frequency: 0.1Hz
Capacitance range: 50nF-5μF
Resistance range: 30MΩ-10GΩ
Volume: 48cm*28cm*58cm
Weight: 45kg
6. Operating conditions: indoor, outdoor; temperature: -10ºC~+40ºC; humidity: ≤85%RH
7. Power supply: frequency 50Hz,60hz, voltage 100v -260V±5%.
8. usb communication port.
9. Use conditions: indoor, outdoor; temperature: -10ºC~+40ºC; humidity: ≤85%RH
10.Power supply fuse: see table 3
11. Power supply: voltage 220V±5%, 50±5Hz
12. Principle of dielectric loss test
Electrical model of cable insulation
Good insulation resistance tends to infinity; capacitive impedance is related to cable characteristics and length; resistive
current is very small and in phase with the voltage; capacitive current has a fixed value and is 90° behind the voltage in phase
l The higher the resistive current, the lower the insulation capacity
l The higher the resistive current, the higher the dissipation angle δ
l The larger the angle of dissipation, the larger the tangent value
l The degree of insulation ageing can be determined by measuring the tangent of the dissipation angle

Bangzhao Electric Co.,Ltd is a company who was established in 2008 and specialized in developing and supplying of power products. The high performance of its products stems from the cutting-edge technology developed by the domestic top 100 engineers. During the past 10 years, we have been providing the best system solutions of pure sine wave inverter,Marine inverter,Car inverter, solar pump inverter,explosion-proof inverter,DC combiner box,PWM & MPPPT controller,AC to DC battery charger ,power phase converter ,lithium battery storage system etc. to customers, it is widely applied in the industry of solar energy,wind power,water power,car,ship,train,hospital, aviation,automation,etc. We believe that through our continuous efforts and pursuit,we can become one of the most influential enterprises between domestic big-power inverter manufacturers.
Bangzhao Electric Co., Ltd. regard technological innovation and best service as the fundamental of business development. The annual technology development investment cost is more than 20% of the annual sales, with an experienced and top professional research and development team, obtained a number of certificate and patent of power products, we are cooperation supplier of many famous companies. "High Efficient, Rigorous, Pragmatic" is the continuous pursuit of the Bangzhao Electrical. Facing today and the future, we will provide more professional and perfect services to the public who support and trust Bangzhao Electric.