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VLF High Voltage Testing Machine,AC Hipot Tester For Large Capacitance Object

VLF High Voltage Testing Machine,AC Hipot Tester For Large Capacitance Object

VLF High Voltage Testing Machine,AC Hipot Tester For Large Capacitance Object
VLF High Voltage Testing Machine,AC Hipot Tester For Large Capacitance Object VLF High Voltage Testing Machine,AC Hipot Tester For Large Capacitance Object

Large Image :  VLF High Voltage Testing Machine,AC Hipot Tester For Large Capacitance Object Get Best Price

Product Details:
Place of Origin: China
Brand Name: Fanke High-voltage
Certification: ISO9001
Model Number: VLF series
Payment & Shipping Terms:
Minimum Order Quantity: One Set
Price: Negotiable
Packaging Details: Export standard wooden case with fumigation free
Delivery Time: 20~30 working days
Payment Terms: T/T
Supply Ability: 20 sets / month
Detailed Product Description
Principle:: Very-low Frequency Technology Principle Usage: Hipot Test For 35KV And Below MV Power Cable And Generator
Component: Controller,HV Booster,Compensation Capacitor Load Test Frequency: 0.1Hz, 0.05Hz, 0.02Hz
Max.Test Voltage: 30KV, 50KV, 90KV Can Be Ordered Load Range:: 0.1Hz, ≤0.5μF ; 0.05HZ,≤0.1μF ;0.02HZ ≤2.5μF
Test Accuracy: No Less Than 3% Output Waveform: Good Sine Wave,Voltage, Waveform Distortion ≤ 5%
HV Booster Using Way: Single Or In Series Connection Duty Cycle: 60mints
High Light:

high voltage vlf hipot instruments


vlf cable testing equipment

VLF High Voltage Testing Machine , VLF AC Hipot Tester , Testing Large Capacitance object


I. Product Description Of VLF Test Technology :

Ultra low frequency insulation withstand voltage test is an alternative method for power frequency withstand voltage test.
Using 0.1Hz ultra low frequency withstand voltage test replace power-frequency withstand voltage test, not only is equivalent to the same equipment, and greatly reduces the volume and the weight, so the ultra-low frequency withstand voltage device is widely used in large generators, cables, power capacitor test AC voltage withstand test products.



II. Technogy feature advantage at DC test /power frequency test/VF test/ VLF test 


Aspects DC Power Frequency Variable Frequency 0.1Hz VLF
Equivalency Poor Good Good Good
Insulation Damage strong slight slight slight
Operation Safety relatively low relatively low relatively low high
Wiring Difficulty complicated complicated most complicated simple
Volume smallest largest large small

See from the above table , VLF test is the substitute for power frequency test. It is suitable for testing electrical equipment with large capacitance.



III. Product advantage and Feaure

  1. Data of current and voltage are obtained directly through the sampling of high-pressure side and it is true and accurate.

  2. Over-voltage protection: the instrument will shut down to protection within 20 ms when the output voltage is exceeding limiting values of setting.

  3. Over-current protection: design for dual protection of high and low voltage, downtime protection can be accurately set in high-pressure side. Shut down to protection times is within 20 ms when the current of low-voltage sides exceeds reacted current.

  4. High-voltage output protection resistor design in the body boost and it is no need to additional outside resistor.

  5. Closed-loop negative feedback control circuit of high and low voltage.

IV. General Technical data:

  1. Peak voltage: 30kV,50KV, 90KV can be ordered
  2. Test frequency: 0.1Hz, 0.05Hz and 0.02 Hz (selectable)
  3. Fuse: 10A
  4. Maximum load capacity: 0.5μF at 0.1Hz; 1μF at 0.05Hz; 2.5μF at 0.02Hz
  5. Power supply: 220V ±10%, 50Hz ±5% (If using a portable generator, make sure the output voltage and frequency are stable. Power >3kW.)
  6. Output voltage accuracy: peak voltage instability 1%; frequency instability 3%; waveform distortion: <5%.
  7. Working environment: indoor or outdoor; -10℃-+40℃; 85%RH
  8. Weight: Control unit - 5kg; HV unit: 48kg

Remarks: Capacitance of test object can not be larger than the maximum value of the test instrument. If capacitance of test object is smaller than 0.05μF, the hipot should be equipped with an auxiliary device (supplied by HV HIPOT at your option).


V. Other typical model


Model no Rated Voltage/current

Load Carrying




Product Structure and Weight



0.1Hz,≤1.1µF 5A


Booster: 25KG




0.1Hz,≤1.1µF 15A


Booster: 50KG




0.1Hz,≤0.5µF 20A


Booster Grade 1(40kV):25KG

Booster Grade 2(50kV):50KG




VI.Test Voltage standard by this test set


1 For MV and below class XLPE cable:

Test peak voltage formula: Umax=3U0

0Single-phase rated voltage of cable

Test time :60mints


2 For generator stator


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);:


Contact Details

Contact Person: Sales Manager

Tel: +8613707144739

Send your inquiry directly to us