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VLF 40 / VLF 40P, VLF 60 / VLF 60P

VLF testing is the proven replacement for the traditional DC Hipot Acceptance or ‘Proof’ test. With more than 700 Very Low Frequency (VLF) units sold, and over 16 years of field use, HDW offers the only VLF units approved under both American and European Recommendations for VLF Testing (IEEE 400.2, VDE 0296). Our VLF technology is the only one on the market that replicates the stress of 'Operational AC' voltage.

VLF Output voltage:
0-40 kVeff(RMS) [VLF 40]
(2.7 per unit for 25 kV cable)
(1.9 per unit for 35 kV cable)
0-60 kVeff(RMS) [VLF 60]
(3.0 per unit for 25 or 35 kV cable)

Testable cable capacity:
4.4μF max./40 kVeff(P Model)
2.2μF max./40 kVeff
1.5μF max./60 kVeff(P Model)
0.8 μF max./60 kVeff

Frequency:
0,1 Hz

Voltage shape:
Cosine Rectangular Wave (Patented)

Change over slope:
approx. 5 ms, Replicates Operational 60 Hz AC

DC Output Voltage:
0-60 kV [VLF 40]
0-80 kV [VLF 60]

Discharge Unit:
safely grounds cable under test
integrated, 4.4 μF in 5 s [VLF 40]
integrated, 1.5 μF in 2 s [VLF 60]

Power Supply:
120 V, 60 Hz, approx. 5 A
230 V, 50 Hz, approx. 2.5 A

Operating Temperature:
-20 °C to +40 °C
(-4 °F to +104 °F)

Dimensions:
(W x H x D) – 22 x 40 x 17 in.

Weights:
110 lb., upper module [VLF 40]
120 lb., upper module [VLF 60]
105 lb., lower module [VLF 40]
105 lb., lower module [VLF 60]

Options:
Data Logging – programmable test cycle
Leakage current measurement (0-7 mA, VLF 40) (0-5 mA, VLF 60)
Automatic Breakdown recognition
Built-in Printer