VLF PROOF TESTERS
VLF Sinusoidal
VLF proof testers perform voltage withstand tests and provide the voltage source for diagnostic cable testing. Vlf testing has established itself in the past two decades as the only system to use for cable testing. The instruments are highly portable and can be set up and used by a single person. Test results are printed immediately after a successful test.
PRINCIPLES OF OPERATION
VLF Proof Testers provide a 40-80kV AC peak output voltage, suitable for VLF hipot testing 11kV – 33kV cables and as a voltage source for partial discharge and tan delta testing of 11-33kV cables. In addition to the standard controls described, this model also contains a Cable Burn mode.
SPECIFICATION
Output Voltage
VLF-40, 0-40kV Peak (28kV RMS)/30mA
VLF-60, 0-60kV Peak (43kV RMS)/30mA
VLF-80, 0-80kV Peak (57kV RMS)/60mA
Sinusodial Output
VLF-40 and VLF-60
0.1Hz ≤ 1.1uF Load
0.05Hz ≤ 2.2uF Load
0.02Hz ≤ 5.5uF Load
VLF-80
0.1Hz ≤ 0.5uF Load
0.05Hz ≤ 1.1uF Load
0.02Hz ≤ 2.5uF Load
Stability of frequency
Fluctuation < 0.5%
Measurement accuracy
± 3%.
Positive and negative voltage peak errors
≤ 3%.
Voltage waveform distortion
≤ 5%
Dimensions and weight
VLF-40
Control Unit 280×370×220mm. 4kg
Transformer 350×200×360mm. 35kg
Compensating Capacitor (For Short Cables) 300X300X700mm. 10kg
VLF-60
Control Unit 280×370×220mm. 4kg
Transformer 1, 330×180×340mm. 25kg
Transformer 2, 330×180×340mm. 25kg
Compensating Capacitor (For Short Cables) 300X300X700mm. 10kg
VLF-80
Control Unit 280×370×220mm. 4kg
Transformer 1, 330×180×340mm. 25kg
Transformer 2, 370×240×390mm. 45kg
Compensating Capacitor (For Short Cables)
300X300X700mm. 10kg
Test Environment
Temperature Indoor and outdoor: -10ºC to + 50ºC.
Humidity: ≤ 85%
Supply Voltage
VLF-40
230V 50Hz, 6A
VLF-40
230V 50Hz, 10A
VLF-40
230V 50Hz, 12A
ACCESSORIES
Connecting leads in soft carry bag
Mains lead
Telescopic discharge resistor
Units packaged in neat transport cases