Voltage testing device VLF-50

for cablesportablehigh-voltage

Used to test cable or rotating machinery(motor/generator) at 0.1Hz, 0.05Hz or 0.02Hz VLF HV Tester is an AC output high voltage instrument for testing power cable or rotating machinery(motor/generator) at 0.1Hz, 0.05Hz or 0.02Hz. The output peak value of Very Low Frequency HV Tester VLF-50 can reach 50kV/30mA. VLF stands for Very Low Frequency. VLF HV Tester is an AC output high voltage instrument. VLF HV Tester provides sinusoidal AC voltage but at 0.1Hz-0.02Hz, compared to the 50/60 Hz output of conventional AC test set. It is still an AC voltage with sinusoidal polarity reversals every half cycle. VLF HV Tester is used to field test high capacitance loads like cable and rotating machinery(motor/generator). The lower the frequency of an AC source, the lower the current and power required to apply a voltage to a capacitive load. The principal use of VLF HV Tester is testing medium and high voltage shielded power cables. It is especially valuable for verifying a cable after installation or repair. Use the VLF to cause defects to fail during the test, find the fault, make the repair or replacement, and be left with a better cable. VLF HV Tester is also very useful for testing large rotating machinery (motor/generator), since it provides a portable and affordable method of field testing coils and is specified by the IEEE 433-2009 standard.