Payment & Shipping Terms:
|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 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|
|Operation Safety||relatively low||relatively low||relatively low||high|
|Wiring Difficulty||complicated||complicated||most complicated||simple|
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
Data of current and voltage are obtained directly through the sampling of high-pressure side and it is true and accurate.
Over-voltage protection: the instrument will shut down to protection within 20 ms when the output voltage is exceeding limiting values of setting.
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.
High-voltage output protection resistor design in the body boost and it is no need to additional outside resistor.
Closed-loop negative feedback control circuit of high and low voltage.
IV. General Technical data:
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||
|Product Structure and Weight|
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,
Ｕ0＝Single-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 Person: Sales Manager