Jan 22, 2019

Useful Information Regarding Hipot Tester

By Diane Bailey


High voltage or high potential test is what the phrase hipot test means. Dielectric withstand test is the other name for this test. It is an analysis of electrical parts. It is done purposely to check for suitability of the electrical insulation. Ensuring current leakage from one place to another within electrical devices does not exist is the goal the analysis is meant to achieve. This analysis is the exact contrary of continuity test. This is what Hipot tester are all about.

Hipot testing is meant to be nondestructive and only to test the potency of electrical insulation. The testing uses high-voltage and is widely applied to all electrical gadgets for a certain period of time to be able to make sure that the insulating column is not marginal. The method involves applying the insulation with excessive amounts of voltage.

Determining the availability of nicked or crushed insulation in a component is part of the goal of the process. Also, the process assists in identification of corrosive or conductive contaminants, stray wire strands, and braided shielding around conductors. By using hipot testing, one can easily identify terminal spacing problems and tolerance errors in cables. Compared to operating voltage, the voltage that is normally applied in this process is two times greater.

Hipot analyzers are the devices applied in Hipot testing. One side of the supply is normally connected to safety ground in a typical tester. The other side of the supply connects the conductor that has to be tested. Only two forms of contact to which the conductors can be linked exist in this arrangement. That is the voltage and ground.

In cases where there are 2 contacts that have to be connected, then one needs to be linked to the voltage whereas the other one is connected to ground. This type of connection is crucial as it guarantees that contacts get isolated from other kinds of contacts. If insulation between the two conductors is insufficient, then a small charge will flow between the two conductors when a massive voltage is passed through.

Even though the flow of such a small current is usually acceptable, a breakdown of solid or air insulation is not supposed to occur in any case. High voltage is usually used in these tests because it is believed that any product is usually subjected to normal day-to-day transient over voltages. As such, in case such variations in voltages occur during the day, the product is supposed to remain operational and safe.

While doing this analysis, varying standards are normally observed. The voltage should be applied for varying amounts of time as required by different standards. The test needs to be continued for a one-minute duration. This requirement is under IEC 06950. A typical rule of thumb requires applying 110 to 120 percent of operational voltage of the product. This is plus 1000 volts for 1 to 2 seconds.

There also are specifications for the quantity of current that is supposed to be applied. As of now, there are several distinct varieties of testers available in the market for people to purchase. Different types of testers are designed for different categories of products. It is therefore critical to know which tester to apply for certain applications.




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