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Very Low Frequency High Voltage Cable Testing Equipment , Acceptance Test Eqipment , VLF Cable Tester
I. Application :
Model VLF-80KV/0.1Hz is designed to perform on-site withstand voltage test with very-low frequency technology for power generators or 35KV and below XLPE power cable.Compared with Hipot test set at main power frequency, VLF HV Test Set just needs much small test power capacity(About 1/500 in theory). Its size and weight also is decreased greatly. Specially the appearance of surveillance can discover the generator insulation abnormal phenomena such as surface corona, discharge and so on.
The test set consists of a control box, two HV boosters, a compensation capacitor and a discharge rod.Based on electronic frequency conversion and microprocessor controlled technology, it has excellent performance.
It is prohibited to boost voltage without load, or to connect with resistive load. If the specimen capacitance is less than 0.05uF, the test set output waveform will be bad. For better performance, optional capacitor is necessary to connect.
Until now , the designed test set also forms many different serialized model according to different withstand test applications through HV booster number of configurations in each set, The alike model can see other typical model at following clause.
II. Supply list of this Model:
Sn
Description
Quantity
1
VLF Measurement and Control unit
1
unit
2
50KV HV Booster
1
unit
30KV HV Booster
1
unit
3
Discharging rod
1
unit
4
Load Capacitor, 0.04µF
1
unit
5
HV Test/Connection Cables
1
set
6
Earth cable
1
unit
7
20A Fuse
5
unit
8
Print paper
2
unit
9
Manual
1
unit
10
Factory test report
1
unit
III. Product Feature :
Electronic frequency conversion
Microprocessor Controlled
Two HV boosters, 90KV output in series; or 40KV/50KV for single one
Large LCD display
Sine Wave Output
Overvoltage protection, action time is less than 20ms
Over current protection for both input and output side, action time is less than 20ms
Output current/Voltagewave form is sampled at high voltage side directly
HV Current Limiting Resistor inside
Micro-printer inside
Output voltage will not be affected by capacitive current during test since closed-loop negative feedback design
VI. Optioonal Model and Test Range:
Model
Peak voltage
Measuring range
Weight
Test object range
VLF-30
30KV
0.1Hz,≤1.1µF
Controller: 4 kg
Booster: 25 kg
Size: L*W*H
323*174*323
10KV and below voltage
cable,generator
0.05Hz,≤2.2µF
0.02Hz,≤5.5µF
VLF-50
50KV
0.1Hz,≤1.1µF
Controller: 6 kg
Booster: 45 kg
Size: L*W*H
357*210*365
15.75KV and below voltage
cable, generator
0.05Hz,≤2.2µF
0.02Hz,≤5.5µF
VLF-60
60KV
0.1Hz,≤1.1µF
Controller: 6 kg
Booster: 50 kg
Size: L*W*H
357*220*370
18KVand below voltage
cable, generator
0.05Hz,≤2.2µF
0.02Hz,≤5.5µF
VLF- 80
80KV
0.1Hz,≤1.1µF
Controller: 8 kg
Booster: 90 kg
Size: L*W*H
357*240*390
35KV and below voltage
cable, generator
V.Test Connection Figure
1. For XLPE cable under 80KV test voltage
2. For Generator stator under 50KV test voltage
VI.Test Model Selection
1.For cable test
Test peak voltage formula: Ｕmax＝3Ｕ0,
Ｕ0＝Single-phase rated voltage of cable
Test time :60mints
2. For generator stator
Ｕtest＝1.414*βKＵ0,
Utest---- 0.1Hz peak test voltage (kV);
β-------0.1Hz and 50Hz voltage equivalent factor, usually taking 1.2;
K------ Usually take 1.3 to 1.5, generally take 1.5;
Uo----- Generator stator windings rated voltage (kV);:
Suntech Power Group is one of the largest Procurement, Engineering & Contracting Group companies in China.Our group branch company and factory have already engaged
in the field of electric power more than 26 years.
1.Steel structure industry especially steel towers and related pr... Suntech Power Group is one of the largest Procurement, Engineering & Contracting Group companies in China.Our group branch company and factory have already engaged
in the field of electric power more than 26 years.
1.Steel structure industry especially steel towers and related pr...
