Tuesday 22 January 2019

Useful And Essential Facts About Hipot Tester

By Diane Bailey


The phrase hipot test means high potential or high voltage test. Another name used to refer to this test is dielectric withstand test. This is an analysis of electrical components that is done with the intention of checking for suitability of electrical insulation. The analysis is meant to ensure that there is no current leakage from one point to another in electrical devices. It is the opposite of continuity test. This is worth knowing about Hipot tester.

The test is nondestructive and capable of determining the sufficiency of electrical insulation. The test uses high voltage. The high voltage is applied to all electrical appliances for a certain time duration to ensure the insulation is more than marginal. High quantities of voltage are applied to the insulation in the process.

The purpose of the process is to determine if there is crushed or nicked insulation in a component. It also helps in identifying conductive or corrosive contaminants, braided shielding, and stray wire strands around conductors. Tolerance errors in cables and terminal spacing problems can also be identified easily using hipot testing. The voltage that is used in this process is usually two times greater than operating voltage.

Hipot testing is normally carried out by use of hipot analyzers. A normal tester usually connects one side to earth while the second part of the tester is connected to conductor that needs to be analyzed. In the arrangement, there are two contact points to which conductors may be connected, the ground and voltage.

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.

While the flow of a small current is normally acceptable, a breakdown of air or solid insulation is not expected in whatever case. Excessive voltage is generally used in these assessments due to the fact that any electrical product is subjected to regular day-to-day transient over voltages. In the event that such variations in voltages take place at some point of the day, the product should be able to remain safe and working.

There are different standards that are usually observed when conducting this analysis. The various standards require the voltage to be applied for different amounts of time. Under the IEC 06950, the analysis is supposed to be continued continuously for a duration of one minute. However, a typical rule of thumb is to apply 110 to 120 percent of operating voltage of the product plus 1000 volts for 1 to 2 seconds.

Specifications for the quantity of current which an individual should apply also exist. Many types of different testers which a person can purchase easily exist in the current market. Varying testers are designed for varying categories of products. Therefore, knowing the tester to apply for specific applications is vital.




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