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.
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Discuss Proposed since January What is the permissible leakage current value for a 11kv cable. As the contamination level increases, the resistance of the contamination drops, and the current increases. Considering high-pot testing is somewhat distractive specially for old and existing electrical equipment, what do you recommend as an alternative test for high-pot testing?
This would allow a manufacturer to filter those products that have marginal insulation, which would have been passed by an ac tester. Neatly explained, step by step. This is often referred to as surface leakage current. Sometimes the question becomes, which is it, dirt or weak insulation?
Retrieved from ” https: Since the dc is free of capacitive division, it is more effective in picking out mechanical damage as well as inclusions or areas in the dielectric which have lower resistance. If I get less value in IR test after hi-pot then before hi pot what could be the reason. Aniel Nov 26, We are seeing VSWR large spikes in coaxial at 2.
I kept in 25mA option and it is tripped, but same way I kept it in mA, and it is not tripped. Joey Dec 15, Any help would be appreciated!
DC Hipot Tester – Hipot Test Procedure – Electrom Instruments
It generally consists of:. The best way to identify the trip level is to test some product samples and establish an average hipot current. Bhadresh Patel Oct 19, This test allows designers to estimate the breakdown voltage of a product’s design and to see where the breakdown occurred. The windings have capacitance. Hipot test are very simple depending what you are testing. I had an Indian EE friend in America. Premium Membership Premium membership gives you an access to specialized technical articles and extra premium content electrical guides and software.
August Learn how and when to remove this template message. This is a high-voltage test that is applied to all devices for a specific time in order to ensure that the insulation is not marginal.
This page was last edited on 31 Decemberat Sarah Nichols Dec 07, Most modern hipot testers allow the user to set the current limit. Your article of hipot is very good and easy to digest, I would like to contact you to ask some direction to solve an issue. The theory behind the test is that if a deliberate over-application of test voltage does not cause the insulation to break down, the product will be safe to use under normal operating conditions—hence the name, Dielectric Withstanding Voltage test.
One of the advantages of an ac hipot test is that it can check both voltage polarities, whereas a dc test charges the insulation in only one polarity. The test duration must be in accordance with the safety standard being used.
This can be done on both types of cables? Please help improve this article by adding citations to reliable sources.
How DC Hipot Tests Work
Do proceduer need to test Hipot test before Functional test or after Functional test? Chickenhawk Aug 12, Get a Quote Careers Exhibitions. Three types of hipot tests are commonly used. It has been suggested that this article be merged into Dielectric withstand test. Unsourced material may be challenged and removed.
Let me know if you have any query.