How do you use AC hipot tester?
Attach the high voltage lead to one of the isolated circuit phase conductors. Switch on the HIPOT Tester. Set the meter to 1000 Volts or pre decide DC Voltage. Push the “Test” button on the meter and after one minute observe the resistance reading.
What is the test voltage for hipot testing?
Such a test applies a voltage to the DUT that is much higher than normal operating voltage; typically 1000V AC plus twice the normal operating voltage. For a household appliance designed to operate at 120 or 240V AC, the test voltage is usually about 1250 to 1500V AC.
What is hipot test used for?
A Hipot test is necessary to test the stress of an electronic device for safety and quality purposes. Under high voltage it checks that there is no breakdown or perforation occurring, and that insulation distances on the line and in the air are respected.
What is transformer hipot test?
The hipot test is a Dielectric Withstand Voltage (DWV) test used to verify the capability of insulation to withstand a specified voltage without electrical breakdown. The objective is to ensure the insulation can withstand more than the expected working voltage by a sufficient margin.
What is the allowable leakage current during hipot test?
Looking at the 120-kΩ rule of thumb, when testing is performed at 1,000 V and the tester is adjusted so that breakdown occurs if the resistance of the product is less than 120 kΩ then the maximum allowable leakage current would be 8.333 mA (1,000 V/120,000 Ω = 8.333 mA).
What is difference between Megger test and hipot tester?
Both instruments apply a comparatively high voltage across insulation and draw leakage current through the insulation, commensurate with its insulating properties and condition. But, a megohmmeter gives the operator a measurement, while a high-pot takes action.
Is AC hipot testing destructive?
The hipot test can be a destructive test; especially when very high test voltages are used. A catastrophic failure of the unit may result if a test voltage greater then 2500 Vac is applied between primary and secondary circuits.
What is acceptable leakage current?
To provide a margin of safety for the consumer, regulatory agencies usually require that a product exhibit a line voltage leakage current of less than 0.5mA. With some products equipped with 3-prong plugs and warning stickers, the permissible leakage current may be as high as 0.75mA, but the typical limit is 0.5mA.
What is the difference between a Megger and hipot?
How do you test for current leakage?
The current flowing in the ground conductor is measured by connecting the meter in series with the grounding connection of the device concerned. Leakage current clamp meter is the most popular device used to measure leakage current.