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WUHAN GUODIAN ZHONGXING ELECTRICAL POWER EQUIPMENT CO., LTD.

Vlf high voltage generator, Very Low Frequency, Hv Test manufacturer / supplier in China, offering VLF High Voltage Generator, Dynamic Characteristics Analyzer forSF6 circuit breakers (ZXKC-HC), DC circuit breaker ampere-second characteristics test system for SF6 circuit breakers (ZXKC-HC) and so on.

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Supplier Homepage Product High Voltage Tester VLF High Voltage Generator

VLF High Voltage Generator

FOB Price: US $3,000-16,000 / Piece
Min. Order: 1 Piece
Min. Order FOB Price
1 Piece US $3,000-16,000/ Piece
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Transport Package: Plywood Case
Payment Terms: L/C, T/T, Western Union

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Basic Info
  • Model NO.: ZXVLF
  • Power Supply: 220V±10%,50±5%Hz
  • Origin: China
  • Peak Voltage: 30kv/50kv/80kv
  • Trademark: GDZX
  • HS Code: 8543709990
Product Description

Withstand voltage test is an essential preventive test for electrical equipment. It is divided into two parts: AC and DC withstand voltage test. AC test can be further divided into power frequency, variable frequency and 0.1Hz very low frequency test, among which the last one is highly recommended by IEC, due to its remarkable advantages. This device is especially suitable for electrical equipment whose insulation equivalent capacitance is large such as power cable, power capacitor, large and medium sized generators and motors , for withstand voltage test
 

Features

  1. Data of current, voltage, wave form directly sampled at high voltage side, so very real and accurate.
  2. When output voltage exceeds the limit preset by user, the instrument will shut itself down within 20ms.
  3. Over-current protection on both high and low voltage sides, so automatic protection can be made according to the set limit of low and high voltage.
  4. Built-in high voltage output protective resistor, no need to connect resistor outside.
  5. Using high & low voltage closed loop negative feedback control circuit, no capacitive rise effect in the process of output.
Technique Parameters

Attention: If use Portable Generator, need generator to have stable voltage output and frequency ( Usually > 3kW, Frequency 50Hz,220V±5%). Otherwise some auxiliary measurements needed in parallel

 

ModelPeak VoltageMeasuring RangeWeightApplication
ZXVLF-30/1.130kV0.1Hz, ≤1.1μFController:4kg
Booster
:25kg
10KV cable, Generator
0.05Hz, ≤2.2μF
0.02Hz, ≤5.5μF
ZXVLF-50/5.050kV0.1Hz, ≤5.0μFController:5kg
Booster
:55kg
For cable burn-through
0.05Hz, ≤10μF
0.02Hz, ≤25μF
ZXVLF-80/1.180kV0.1Hz, ≤1.1μFController:5kg
Booster
:45kg
35KV cable, Generator
0.05Hz, ≤2.2μF
0.02Hz, ≤5.5μF
Power supply:220V±10%,50±5%Hz
Output peak voltage unstability : 1%
Output voltage frequency unstability: 3%
Output voltage waveform distortion  :≤5%
Working condition : temperature : -10 ºC~+40 ºC ;humidity  :≤85%RH
 
Test scope:
1)The test object capacitance should be below the instrument rated capacitance
2)The waveform will be influenced If the test products capacitance is too small. The instrument can't normally output when it's below 0.05μF, In this situation you can use our Compensation Capacitor



Below for reference
Single phase ground capacitance of different Generators
ModelThermal PowerHydropower
Generator capacity(MW)20030060085125-150300400
single phase ground capacitance (μF)0.1980.18-0.260.31-0.340.691.8-1.91.7-2.52.0-2.5

 

Power capacitance of single-core XLPE insulated cable (µF/km) 

Capacity µF/Km
Voltage (kV)100.150.170.180.190.210.240.260.280.320.38-
35---0.110.120.130.140.150.160.170.19
Cross-sectional162535507095120150185240270
area (cm²)

 

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