What is Hi-Pot or High Pot(High Potential) Testing?


Hipot Testing, High Potential, High Pot


The testing of dielectric strength of any electrical appliances or machine is known as Hipot Testing. The Hi-Pot testing is also known as high pot or High Potential Testing. In simple words, dielectric strength testing is known as Hipot Testing. It is basically a class of electrical safety of any device or appliance or machine. It is used to test the strength of the insulation of finished appliances before releasing them to the market. The device is to be tested is called Device Under Test(DUT).

Generally, a very high voltage is applied to the insulation for this testing. This applied voltage is generally much larger than the operating voltage. For example, if the equipment is designed to operate with 120V or 240V then it will be tested under 1250 to 1500V. Although the applied voltage depends upon the type of insulation of the device. If the device is double insulated then the applied voltage will be very high up to 4000V.


Importance of Hipot Testing


The main function or purpose of Hipot testing is electrical safety. The Hipot testing ensures that the device can be handled safely or not. For example, a household appliance must be tested under the Hipot because during its operation any accident may happen such as electrical shock, leakage current. It makes sure that the consumer will not get any electric shock when they handle or operate the product. This testing also ensures that the insulation can withstand the transient voltage. If the device failed during testing the device again insulated with high-grade material or rejected. The Hipot testing is very helpful to find out the crushed insulation or naked insulation or any cutting in insulation. It helps to resolve the terminal spacing problem, tolerance error in cables, conductive or contaminated layers around the cable.


How Hipot Testing is Performed?


Hipot testing is performed by connecting one terminal to the ground and another terminal to the equipment. A very high voltage is applied and the flow of current is to be measured. By calculating the current flow the strength of the insulation can be measured. It is obvious that if the insulation is very high the current flow will be very low or negligible but if the insulation is poor the current flow will be high that is not acceptable. During the testing, it must be ensured that the testing should not be connected to any other contacts. If the device or product can withstand a very high voltage during the testing then it ensures that a large margin of protection exists for the consumer.


Types of Hipot Testing


There are both AC and DC Hipot testing is available. Both of testing is done in the same way but in case of DC Hipot testing, the applied voltage is more with respect to a factor of 1.414. For example, a 120V or 240V device can be tested with up to 1500V AC Hipot testing whereas it can be tested up to 2200V DC Hipot Testing. The connection or circuit arrangement is almost the same for both types of testing.


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What is Hi-Pot or High Pot(High Potential) Testing? What is Hi-Pot or High Pot(High Potential) Testing? Reviewed by Author on 1/18/2022 Rating: 5
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