VLF Advantage
1. AC/DC Withstand voltage testing.
2. Tan delta (tgδ test), capacitance (μF) and IR (Ω) Test without external device .
3. Partial discharge testing without external device.
4. Safe Optical isolation technology.
5. Easiest to use Fully automatic microcontroller.
6. H/L voltage closed loop negative feedback control circuit, output no capacity rise effect.
7. Built-in printer.
8. Built-in protective resistors.
9. Colour Touch LCD operation, True sine wave output.
10. Real-time display of actual output waveform.
11. Ergonomic, menu guided, large colour touch screen
12. Storage of test results for later retrieval and print.
13. Over voltage and current protected.
14. Variable frequency 0.1Hz, 0.05Hz, 0.02 Hz, 0.01 Hz (auto variable frequency).
15. 60 mins continuous working;
16. Data of current, voltage and waveform directly sampled at HV side.
17. AC voltage & current curve display; DC voltage curve display.
18. Harmful space charges are not injected into the cable insulation.
19. No traveling waves are generated during testing.
20. Rugged and reliable design less prone to failure from transients.
21. Invatation Patent
22. Portable: Control unit + Booster (Tank)
23. CE mark.
24.” IEE 400.2” Analysis software of Tan delta test result (for buyer’s option).
Specification
1.Power: 220V ± 10% AC (110V can be customized), 50/60Hz, single phase;
2.Output-Voltage (Peak): 0 to rated value (50KV);
3.Output frequency: 0.1Hz, 0.05Hz, 0.02 Hz, 0.01 Hz (auto variable frequency);
4. Stability of frequency: Fluctuation < 0.5%;
5. Measurement accuracy: ±3%;
6. Positive and negative voltage peak error: ≤3%;
7. Voltage waveform distortion: ≤5%;
8. Construction: 1 Control unit + 1 Booster (50KV set);
9. Ambient conditions of use: temperature Indoor and outdoor : -10ºC ～ + 50ºC.
10. Humidity:≤85%
11. Technical indexes of VLF dielectric loss (tgδ test):
1) Test voltage range: 0 to rated value (50KV)
2) Dielectric loss test frequency: 0.1Hz
3) Measurement range: 0.01×10-3- 5000.00×10-3
4) Dielectric loss resolution: 1x10-4
5) Dielectric loss resolution: 1x10-5
6) Capacitance measurement range: 0.01μF-10μF
7) Celectric capacity resolution: 0.01μF
8) Current measurement range: 0–59mA
9) Insulation resistance: 1MΩ-25122MΩ (25.122GΩ)
10) Insulation resistance resolution: 1MΩ
12.Main technical indexes of VLF PD test
1) Partial discharge measurement range: 0.01pc-200pc
2) Partial discharge detection sensitivity: 0.01pc
3) Capacitance range: 0.01μF-10μF
4) Sampling bits: 12 bits
Table: The “VLF-M” series supply AC/DC withstand voltage testing + tgδ test + Capacity(μF) + IR(Ω) + PD(pc):
|
Model no
|
Output
Voltage/
Current
(Peak)
|
Load Capacity
|
Control Unit
|
Booster
|
Power
|
|
Capacitance/
Freuency
|
Net Dim.
(cm)
|
Net Wt
(kg)
|
Net Dim.
(cm)
|
Net Wt
(kg)
|
|
VLF-30M
|
30KV/20mA
|
0.1Hz-0.01Hz
Capacity:≤10µF
Auto Variable
|
40×24×31
|
6
|
34×16×30
|
25
|
1000W
|
|
VLF-40M
|
40KV/20mA
|
0.1Hz-0.01Hz
Capacity:≤10µF
Auto Variable
|
40×24×31
|
6
|
44×18×37
|
40
|
1200W
|
|
VLF-50M
|
50KV/30mA
|
0.1Hz-0.01Hz
Capacity:≤10µF
Auto Variable
|
40×24×31
|
6
|
44×19×37
|
45
|
1500W
|
|
VLF-60M
|
60KV/59mA
|
0.1Hz-0.01Hz
Capacity:≤5µF
Auto Variable
|
40×24×31
|
6
|
45×20×38
34×16×30
|
45+25
|
2000W
|
|
VLF-70M
|
70KV/59mA
|
0.1Hz-0.01Hz
Capacity:≤5µF
Auto Variable
|
40×24×31
|
6
|
45×20×38
34×16×30
|
45+25
|
2500W
|
|
VLF-80M
|
80KV/59mA
|
0.1Hz-0.01Hz
Capacity:≤5µF
Auto Variable
|
40×24×31
|
6
|
45×20×38
34×16×30
|
45+25
|
3000W
|
|
VLF-90M
|
90KV/59mA
|
0.1Hz-0.01Hz
Capacity:≤5µF
Auto Variable
|
40×24×31
|
6
|
46×22×38
45×20×38
|
45+30
|
3500W
|
|
VLF-100M
|
100KV/59mA
|
0.1Hz-0.01Hz
Capacity:≤5µF
Auto Variable
|
40×24×31
|
6
|
50×25×40
45×20×38
|
45+45
|
4000W
|
Function comparison of VLF series models
|
Output
(Peak)
|
Model no
|
AC/DC Withstand Voltage Test
|
Tan Delta (tgδ）Test
|
PD Test
|
Capacity
(μF)
|
Insulation
Resistance
Test (IR)
|
|
30KV
|
VLF-30
|
√
|
X
|
X
|
X
|
X
|
|
VLF-30T
|
√
|
√
|
X
|
√
|
√
|
|
VLF-30P
|
√
|
X
|
√
|
√
|
X
|
|
VLF-30M
|
√
|
√
|
√
|
√
|
√
|
|
40KV
|
VLF-40
|
√
|
X
|
X
|
X
|
X
|
|
VLF-40T
|
√
|
√
|
X
|
√
|
√
|
|
VLF-40P
|
√
|
X
|
√
|
√
|
X
|
|
VLF-40M
|
√
|
√
|
√
|
√
|
√
|
|
50KV
|
VLF-50
|
√
|
X
|
X
|
X
|
X
|
|
VLF-50T
|
√
|
√
|
X
|
√
|
√
|
|
VLF-50P
|
√
|
X
|
√
|
√
|
X
|
|
VLF-50M
|
√
|
√
|
√
|
√
|
√
|
|
60KV
|
VLF-60
|
√
|
X
|
X
|
X
|
X
|
|
VLF-60T
|
√
|
√
|
X
|
√
|
√
|
|
VLF-60P
|
√
|
X
|
√
|
√
|
X
|
|
VLF-60M
|
√
|
√
|
√
|
√
|
√
|
|
70KV
|
VLF-70
|
√
|
X
|
X
|
X
|
X
|
|
VLF-70T
|
√
|
√
|
X
|
√
|
√
|
|
VLF-70P
|
√
|
X
|
√
|
√
|
X
|
|
VLF-70M
|
√
|
√
|
√
|
√
|
√
|
|
80KV
|
VLF-80
|
√
|
X
|
X
|
X
|
X
|
|
VLF-80T
|
√
|
√
|
X
|
√
|
√
|
|
VLF-80P
|
√
|
X
|
√
|
√
|
X
|
|
VLF-80M
|
√
|
√
|
√
|
√
|
√
|
|
90KV
|
VLF-90
|
√
|
X
|
X
|
X
|
X
|
|
VLF-90T
|
√
|
√
|
X
|
√
|
√
|
|
VLF-90P
|
√
|
X
|
√
|
√
|
X
|
|
VLF-90M
|
√
|
√
|
√
|
√
|
√
|
|
100KV
|
VLF-100
|
√
|
X
|
X
|
X
|
X
|
|
VLF-100T
|
√
|
√
|
X
|
√
|
√
|
|
VLF-100P
|
√
|
X
|
√
|
√
|
X
|
|
|
VLF-100M
|
√
|
√
|
√
|
√
|
√
|
Analysis software of Tan delta test results (IEE400.2)
Field connection diagram (Test object: cable)
Package for transport (50KV test set):
|
Sr no
|
Name of Commodity
|
Qty
|
N.W
|
G.W
|
Transport size
(LxWxH)
|
|
1
|
Controller
|
1 unit
|
5 kg
|
82 kg
|
450x490x950mm
|
|
Capacitor 0.04µF
|
1 unit
|
5 kg
|
|
Booster I (50KV tank)
|
1 unit
|
45 kg
|
|
Aluminum alloy box
|
1 unit
|
5kg
|
|
Total:
|
1 set
|
60 kg
|
82 kg
|
0.21 m3
|
|
Packed in 1 wooden case.
|
Accessories
|
Sr no.
|
Description
|
Quantity
|
Remarks
|
|
1
|
Control unit
|
1
|
unit
|
|
|
2
|
Booster I (Tank I)
|
1
|
unit
|
1 Booster if ≤50KV set;
2 boosters for ≥60KV set.
|
|
Booster II (Tank II)
|
1
|
unit
|
|
3
|
Capacitor (0.04µF)
|
1
|
unit
|
Used as Capacity supplement, or test object for demo
|
|
4
|
Discharge rod
|
1
|
unit
|
|
|
5
|
HV Test/Connection cables
|
1
|
set
|
|
|
6
|
Earth cable
|
1
|
unit
|
|
|
7
|
Power supply cable
|
1
|
unit
|
|
|
8
|
Fuse
|
2
|
units
|
|
|
9
|
Printer paper
|
1
|
unit
|
|
|
10
|
Operating manual
|
1
|
unit
|
|
|
11
|
Aluminium alloy box
|
1
|
unit
|
1 aluminium alloy box ≤50KV set;
2 aluminium alloy boxes ≥60KV set.
|
|
1
|
unit
|
0.1Hz VLF AC/DC Hipot tester
