Very Low Frequency Tester

Product Introduction

The VLF Hipot Tester is designed for voltage withstand testing of electrical equipment with large equivalent insulation capacitance. Utilizing digital frequency conversion technology and microprocessor control, it connects the controller to the high-voltage generator via a low-voltage link with photoelectric isolation. The system incorporates a closed-loop negative feedback control circuit between high and low voltage stages, ensuring stable output without capacitive rise effect.

Technical parameter

1.Working power： 220V±5%，50Hz

Note:that a digital variable frequency generator must be used, its output frequency is 50Hz, input voltageis220Vand power is larger than 8kW. 

2.Output voltage：80kV

3.Output frequency：0.1Hz、0.05Hz、0.02Hz

4.Load capacity：0.1Hz-0.5uF、0.05Hz-1.0uF、0.02Hz-2.5uF4.Measurement accuracy：3%

5.Voltage positive, negative peak error：≤3％

6.Voltage waveform distortion：≤5％

7.Working temperature：-10℃～+40℃；humidity：≤85％RH

Transportation and storage

1) Transportation

This product must be packed during transportation. Cartons or wooden cases can be used as packing cases, and foam shockproof layer should be padded in the packing cases. Packaged products should be able to be transported by road, railway, and air. During transportation, it is not allowed to be placed in an open cargo box. The warehouse should pay attention to rain, dust, and mechanical damage prevention.

2) Storage

When the instrument is not in use, it should be stored indoors in an environment with a humidity of -20 ℃ to+60 ℃, a relative humidity not exceeding 85%, ventilation, and no corrosive gases. Storage should not be placed close to the ground or walls. In humid areas or seasons, if this instrument is not used for a long time, it is required to be powered on once a month (about two hours) to dissipate moisture and protect the components

Precautions

Strict attention should be paid to the following points during the experiment:

1) The booster equipped with this instrument shall not be used for other purposes.

2) Do not place the booster on the side or upside down to prevent the leakage of internal insulation oil.

3) If the instrument is charged inside and malfunctions due to operation or wiring errors, do not disassemble and repair it yourself to avoid accidents. Instead, contact our company for repair.

4) To ensure personal safety, a safe distance must be maintained before and during the experiment.

5) Before or after starting the voltage boosting process, a discharge rod should be used to fully discharge the test sample.

6) When connecting, disconnecting, or temporarily not using the instrument, the power should be turned off.