I. 0.1Hz VLF Tan Delta Voltage Resistance Technology Advantages

Ultra-low frequency insulation withstand voltage test is actually an alternative to power frequency withstand voltage test. In the power frequency voltage test of large and medium-sized generators, motors, power cables and other test products, because their insulation layer presents a large capacitance, so a large capacity of the test transformer or resonant transformer is needed.Such huge equipment, not only bulky, high cost, but also very inconvenient to use. In order to solve this contradiction, the method of reducing the test frequency and thereby reducing the test power supply capacity is widely used in the world.From many years of theory and practice at home and abroad, it has been proved that using 0.1Hz ultra-low frequency voltage withstand test to replace power frequency voltage test, not only can have the same equivalence, but also the volume of the equipment is greatly reduced, the weight is greatly reduced, the theoretical capacity is about 500% of the power frequency, and the operation is simple. This is the main reason why this method is widely adopted in developed countries.

According to the actual situation of China's power system, the National Development and Reform Commission has formulated the “35kV and below crosslinked polyethylene insulated power cable ultra-low frequency (0.1Hz) voltage test method” industry standard, in 2004 promulgated the power industry standard "Ultra-low frequency high voltage generator general technical conditions DL/T 849.4-2004", The latest test method is being popularized in our country.

Although the DC withstand voltage test equipment has the advantages of small size, light weight and low cost, the DC withstand voltage test is also the most destructive to the insulation of the tested product. (See Table 2) Therefore, the relevant regulations for preventive test of electrical equipment promulgated by the State have explicitly stipulated that DC high voltage is no longer used for voltage withstand test of electrical equipment, and AC voltage withstand test is recommended.

The new generation of this series of 0.1Hz VLF High Voltage Generator developed by our company adopts the latest power electronic components and the latest ARM7 microcontroller technology, further reducing the volume and weight of the equipment, enable fool operation, more stable performance, and overcoming the shortcomings of the first generation of mechanical booster with short service life, high failure rate and large volume. Through years of practice, a large number of users' feedback shows that this series of VLF Hipot Technology is leading in the country and has the highest cost performance!

II. Technical Parameters Of HZDPS Series

1.Voltage(Peak): 0-40kv,    Sensitivity: 0.1kV,     Accuracy: 1 % 

2.Waveform: Ultra-low frequency sine wave, DC voltage, Voltage positive and negative 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): 0nF–10μF

4.Current: Measurement range: 0–70 mA,    Sensitivity: 1μA,    Accuracy: 1 %

5.Tan Delta:

Ultra-low frequency sine wave voltage range: 1–40 kVrms

Load range: 50nF–5μF

Resolution: ≥1x10-6

Accuracy: ≥1x10-3

Measurement range: 1x10-3–21000x10-3

Tan Delta measurement frequency: 0.1Hz

Capacitance range: 50nF-5μF

Resistance value rang: 30MΩ-10GΩ

Dimensions: 48cm*28cm*58cm

Weight: 45kg

6.Working condition: indoor、outdoor; Temperature: -10℃～+40℃; Humidity:≤85％RH

7.Power supply: Frequency 50Hz,60hz, Voltage 100v -260V±5%.

8.USB communication port. 

9.Power supply fuse pipe: see Table 3

10.Power supply: Voltage 220V±5%, 50±5Hz

11. Principle of Tan Delta testing