Withstand voltage test is an essential preventive test for electrical equipment. It is divided into two parts: AC and DCwithstand 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.
Following is a comparison for DC, Power Frequency, Variable Frequency, and 0.1Hz test.
Aspects |
DC |
Power Frequency |
Variable Frequency |
0.1Hz |
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 |
In fact VLF test is the substitute for power frequency test. It is suitable for testing electrical equipment with large
capacitance.
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).
HV Hipot Electric Co.,Ltd.
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