The high-voltage withstand test of electrical equipment is one of the most important items specified in the Preventive Test of Insulation. The withstand voltage test can be classified into the AC withstand voltage test and the DC withstand voltage test. The AC withstand voltage test can also be divided into power frequency, frequency conversion and 0.1Hz ultra-low frequency test technologies. The 0.1Hz ultra-low frequency technology is the latest technology and is the technology recommended by IEC (International Electrotechnical Commission) at present. The new generation of VLFS series microcomputer type 0.1 Hz ultra-low frequency high-voltage generators are core products independently developed by FARSEE,they overcome many shortcomings of mechanical domestic products, and its cost performance is much higher than the similar imported products. It is particularly suitable for the withstand voltage test of electrical equipment (e.g.: power cables, power capacitors, large- and medium-sized generators and motors, etc.) with large insulation equivalent capacitance, and it meets the requirements of the electric power industry standard General Technical Specification of Ultra-low Frequency High-voltage Generator DL/T849.4-2004 newly issued by the country in 2004.

1. Technical parameters

★ Main parameters of series products are shown in Table 1

Table 1 Main Technical Parameters of VLFS Series Ultra-low Frequency High-voltage Generator

★ Power supply: 220V±10%, 50±5%Hz

Note: When a portable generator is used for supplying power, it is required that output voltage and frequency of the generator shall be stable (generally it is required that power shall be greater than 3 kW, the frequency shall be 50 Hz, and voltage shall be 220V±5%), otherwise some assistance measures shall be used to stabilize output of the generator.

★ Output voltage precision:

Degree of instability for peak value of output high voltage: ≤1%

Degree of instability for frequency of output voltage: ≤3%

Distortion rate of output voltage waveform: ＜5%

★ The instrument has the function of not burning the booster and the mainframe in case of power failure and sudden shutdown during the operation.

★ Service environment: Temperature: －100C～＋400C, humidity: ≤85%RH