Hipot Testers for AC, DC and Dielectric Withstand Testing

A hipot tester is a high-voltage electrical test instrument used to verify whether insulation can withstand a specified AC or DC test voltage without insulation breakdown, flashover or excessive leakage current. The term "hipot" is a shortened form of "high potential".

AC hipot testing applies an alternating voltage to evaluate insulation withstand capability, while DC hipot testing applies a direct voltage and is often used for applications requiring DC withstand testing and leakage current measurement. The appropriate method depends on the test object, insulation characteristics, applicable standards and testing requirements.

Hipot testers can be used for insulation withstand testing of various high-voltage electrical equipment, including power cables, transformers, circuit breakers, generators and other electrical equipment requiring dielectric strength verification. The suitable test method and voltage level depend on the equipment type and applicable testing requirements.

Choosing the right hipot tester depends on the equipment being tested, required test voltage, AC or DC testing requirements, test environment and measurement functions. Portable DC hipot testers are suitable for field insulation testing applications, while AC/DC high-voltage test systems are typically selected for higher voltage testing requirements and more comprehensive test setups.

Leakage current measurement evaluates the small amount of current flowing through the insulation system during a hipot test. An abnormal increase in leakage current may indicate insulation deterioration, contamination, moisture, surface tracking or other potential insulation issues. Monitoring leakage current helps assess insulation condition and determine whether the test result meets the specified criteria.