various cable testing methods. The choice of the right method and the most appropriate instrument Before moving on to the main hipot testing techniques, it is. that you understand the proper setup and use of our hi-pot testers. Please accepts pass results for the following four hi-pot test methods: AC VOLTAGE. Hipot testing involves using a high potential (voltage) to test insulation. A hipot test can be very useful in helping you develop a process that builds high quality.
|Published (Last):||22 March 2012|
|PDF File Size:||19.93 Mb|
|ePub File Size:||5.40 Mb|
|Price:||Free* [*Free Regsitration Required]|
Hipot – Wikipedia
It can happen in seconds or may take 10 minutes or more. Therefore, the current of interest is the current that is the result of a partial discharge or breakdown, rather than the current due to capacitive coupling. Hello The rule of thumb for duration of hipot testing seconds.
The hipot tester current trip level should be set high enough to avoid proceduure failure related to leakage current and, at the same time, low enough not to overlook a true breakdown in insulation.
If I get less value in IR test after hi-pot then before hi pot what could be the reason.
How DC Hipot Tests Work
Syamdas Nov 14, Kan Feb 16, The test duration must be in accordance with the safety standard being used. Hipot testers usually connect one side of the supply to safety ground Earth ground.
A hipot tester can be very similar to a cable tester and often the two are combined into a single device. Gokulakrishnan Jan 09, This may become a concern for products that actually use ac voltage for their normal operation. Surge absorber, CT, and busbar still connecting to cable.
I want an insulation for instrumentation purpose from readily available insulation polymers that can be molded which has very low leakage in the range of femtoamps, I am basicaly interested in measuring current in that range, Operating voltage is in the range of Vdc to v DC.
The leakage current must procfdure below a preset limit or the test is considered to have failed. Is there a porcedure from DC microamps to Tet microamps? The peak value of this current may be very high, reflecting the energy stored in the capacitance of the winding. Usual problem, but still I am not cleared…If there is any acceptable leakage current value is there during Hi-pot test, please share with us.
Chickenhawk Aug 12, For used, good motors, this current will dwarf the absorption and volume conduction currents because of the relatively lower resistance in the surface contamination.
It applies tezt voltage gradually.
I looked at the IEC spec and proceudre quite figure it out. A standard test voltage is applied below the established Breakdown Voltage and the resulting leakage current is monitored.
The resulting current that flows through the insulation, known as leakage current, is monitored by the hipot tester. The currents are the same currents present in an insulation resistance test:. In the section regarding hjpot setting for the HIPOT test, the current trip level is set as 2x the scaled up value of the rated leakage.
This is often referred to as surface leakage current. By monitoring the current flow as voltages increase, an operator can detect a potential insulation breakdown before it testt.
Is there a table of all different voltages of transformer and the voltages to apply to hipot transformer. It appears that the 2x is just to reduce trips since the real part of the test is arcing and breakdown. Andhika Dec 18, Do we need to test Hipot test before Functional test or after Functional test? Ttest Jun 28, hiopt The production-line hipot test, however, is a test of the manufacturing process to determine whether the construction of a production unit is about the same as the construction of the unit that was subjected to type testing.
Jignesh Parmar Jignesh Parmar has completed M.