Wuhan Goldsol Co., Ltd.

Vlf Hi-Pot Test, Vlf High Voltage Test Set, Vlf Hipot Tester manufacturer / supplier in China, offering Vlf High Voltage Tester (VLF-50), Winding Resistance Tester, Very Low Frequency High Voltage Tester (VLF-30/40/50) and so on.

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Vlf High Voltage Tester (VLF-50)

FOB Price: Get Latest Price
Min. Order: 1 Piece
Production Capacity: 50 Sets/Month
Transport Package: Aluminum Box Inside and Plywood Case Outside
Payment Terms: L/C, T/T

Basic Info.

Model NO.:VLF-50
Connectors:RS232
Test Mode:Instant Test
Usage:Cable Withstand Voltage Testing
Test Region:All Cables
Cable Type:All Cables
Power:0-80kv
Certification:CE
Customized:Non-Customized
Color:Black
Vlf Hipot:Vlf 30/40/50kv
Trademark:GOLDSOL
Specification:CE Mark
Origin:China
HS Code:8543709990

Product Description

The VLF testers (Generator) are suitable for testing Dielectric strength of cables, transformers, switchgear, rotating machinery, and other electrical apparatus.


Vlf High Voltage Tester (VLF-50)

VLF Advantages:

1. Easiest to use Fully automatic 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 print.
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 transients

Safety Features

1. 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.

Vlf High Voltage Tester (VLF-50)

Specifications

1. Input: 220 ± 10% Volts AC, 50/60 Hz, single phase.
2. Output-Voltage: 30, 40, 50, 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 High Voltage Tester (VLF-50)
VLF Applications

Cable 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 your 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.

Type
Output
Voltage/Current
Load  CapacityControl  UnitBoosterFuse  Tube

Frequency/Capacitance
Dim.
(cm)
Wt
(kg)
Dim.
(cm)
  Wt
(kg)
VLF-30/1.1  30KV/20mA0.1Hz  ≤   1.1uF
0.05Hz  ≤   2.2uF
0.02Hz  ≤   5.5uF
28× 37× 22433× 18× 34255A
VLF-40/1.1  40KV/30mA0.1Hz  ≤   1.1uF
0.05Hz  ≤   2.2uF
0.02Hz  ≤   5.5uF
28× 37× 22435× 20× 36356A
VLF-50/1.1  50KV/40mA0.1Hz  ≤   1.1uF
0.05Hz  ≤   2.2uF
0.02Hz  ≤   5.5uF
28× 37× 22437× 24× 39457A
VLF-60/1.1  60KV/50mA0.1Hz  ≤   1.1uF
0.05Hz  ≤   2.2uF
0.02Hz  ≤   5.5uF
28× 37× 22433× 18× 34
33× 18× 34
25+2510A
VLF-70/0.5  70KV/55mA0.1  Hz,   ≤ 0.5µ F
0.05Hz,   ≤ 1.0µ F
0.02Hz,   ≤ 2.5µ F
28× 37× 224
33× 18× 34
35× 20× 36
25+3510A
VLF-80/0.5   80KV/60mA0.1  Hz,   ≤ 0.5µ F
0.05Hz,   ≤ 1.0µ F
0.02Hz,   ≤ 2.5µ F
28× 37× 22433× 18× 34
37× 24× 39
25+4512A
 
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Wuhan Goldsol Co., Ltd.

- Hubei, China
- Manufacturer/Factory, Trading Company

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