China Vlf Hi-Pot Test Vlf High Voltage Test Set Vlf Hipot Tester

The VLF testers (Generator) are suitable for testing Dielectric strength of cables, transformers, switchgear, rotating machinery, and other electrical apparatus.
VLF Advantages:1. Easiest to use Fully aHand Tools utomatic microcontroller
2. Built-in printer
3. True sine wave output
4. Real-time display of actual output waveform
5. Ergonomic, menu guided, large backlit LCD
6. Storage of test results for later retrieval and prGas Generation Equipment & Parts int.
7. Over voltage and current protected
8. Variable frequency 0.1Hz, 0.05Hz, 0.02 Hz
9. Data of current, voltage and waveform directly sampled at HV side.
10. AC testing does not degrade good cable insulation
11. Harmful space charges are not injected into the cable insulation
12. No traveling waves are generated during testing
13. Rugged and reliable design less prone to failure from transientsSafety Features1. Short circuit protected.
2. Status display of all important safety functions and messages.
3. Safe, easy to use operation with emergency off and key switch lock-out.
4. Fully integrated discharge circuit to safely ground the DUT after testing.
5. Zero start interlock.
6. Zero voltage switching.Specifications1. Input: 220 ± 10% Volts AC, 50/60 Hz, single phase.
2. Output-Voltage: 30, 40, 50,Engine & Part 60, 70, 80, 90KV
3. Output frequency: 0.1Hz, 0.05Hz, 0.02Hz.
4. Stability of frequency: Fluctuation < 0.5%
5. Measurement accuracy: ± 3%.
6. Positive and negative voltage peak errors: ≤ 3%.
7. Voltage waveform distortion: ≤ 5%
8. Construction: In two units: Controller and Booster...
9. Ambient conditions of use: Temperature Indoor and outdoor: -10º C to + 50º C.
10. Humidity: ≤ 85%
VLF ApplicationsCable Installation And/Or Repair
Monitoring the integrity of cable insulation has always been the top priority among electric utilities because it ensures continuity of suplly. During routine maintenance, by detecting early insulation deterioration, remedial measures can be taken to repair economically and at convenience.
Cable runs can have high capacitance. An AC hipot test using VLF is the best reliable means to check cable integrity. Either the cable withstands the test voltage or fails. It is a PASS/ FAIL test. If there is failure, find the fault, repair it, and there you have a good cable.
DC hipot testing causes damage to insulation with some potential adverse charging effects. DC hipot testing causes a treeing effect, which is void in insulation. Charges that built up within these voids using the DC test voltage method would want to dissipate to ground, thus causing a breakdown in cable's insulation, which would ultimately cause a failure. The VLF AC hipots enable users to AC field test cable. The main advantage of the VLF AC hipot tester over the previously used DC hipot testers, is that potential problems in cables can be discovered earlier.2. Routine System Testing
Routine tests must be conducted by VLF on installed cable: Feeders, substation cables, etc. If it is found that a cable can't hold 2 to 3 times normal voltage, at yoPower Transmission Parts ur convenience, VLF to breakdown the defect to locate the fault. Carry out the repairs and you have a good cable. It's simple, fast, economical, and conclusive.3. Cable Fault Burning
To burn down cable faults using DC hipots or low current rated thumpers takes a long time. Burn down cable faults in short time with a VLF hipot. The VLF hipot's output is raised to the level of cable breakdown. And the cable arcs at the fault point, when all the stored energy in the cable along with the VLF current is discharged into the fault. The discharge energy can be thousands of joules, depending upon the charge built up. This energy rapidly reduces the cable fault impedance to near zero. The VLF reverses polarity every half cycle and this helps the process. This alternating negative and positive discharge causes rapid carbonization of the insulation.
TypeOutput
Voltage/CurrentLoad CapacityControl UnitBoosterFuse Tube
Frequency/CapacitanceDim.
(cm)Wt
(kg)Dim.
(cm) Wt
(kg)VLF-30/1.1 30KV/20mA0.1Hz ≤ 1.1uF
0.05Hz ≤ 2.2uF
0.02Hz ≤ 5.5uF28x 37x 22433x 18x 3425Heater & Heat Exchanger 5AVLF-40/1.1 40KV/30mA0.1Hz ≤ 1.1uF
0.05Hz ≤ 2.2uF
0.02Hz ≤ 5.5uF28x 37x 22435x 20x 36356AVLF-50/1.1 50KV/40mA0.1Hz ≤ 1.1uF
0.05Hz ≤ 2.2uF
0.02Hz ≤ 5.5uF28x 37x 22437x 24x 39457AVLF-60/1.1 60KV/50mA0.1Hz ≤ 1.1uF
0.05Hz ≤ 2.2uF
0.02Hz ≤ 5.5uF28x 37x 22433x 18x 34
33x 18x 3425+2510AVLF-70/0.5 70KV/55mA0.1 Hz, ≤ 0.5µ F
0.05Hz, ≤ 1.0µ F
0.02Hz, ≤ 2.5µ F28x 37x 224
33x 18x 34
35x 20x 3625+3510AVLF-80/0.5 80KV/60mA0.1 Hz, ≤ 0.5µ F
0.05Hz, ≤ 1.0µ F
0.02Hz, ≤ 2.5µ F28x 37x 22433x 18x 34
37x 24x 3925+4512A