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).

How is DC leakage current measured?

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.

How is hipot leakage current calculated?

Using the formula I = 377VC, find the leakage current I (in amps) by multiplying the voltage that your hipot test is conducted at (V) by the capacitance you measured between line and ground (C), and multiplying that product by 377. This will give you the anticipated leakage current I (in amps).

What is leakage current in hipot test?

Leakage current is the stray current that actually flows on the surface of and through the insulation.

How do you calculate leakage current?

The leakage current can be estimated as follows from the insulation resistance specification value and the rated voltage of the item using the formula I = V/R.

What are different types of leakage current?

There are two types of leakage current: ac leakage and dc leakage. Dc leakage current usually applies only to end-product equipment, not to power supplies.

How do you perform a leakage current test?

If circuit wiring leakage alone is required, disconnect (switch off) the load. Test single-phase circuits by clamping the phase and neutral conductor. The measured value will be any current flowing to ground. Test three-phase circuits by clamping around all three-phase conductors.

How does a DC hipot test test leakage?

DC Hipot Test –At test start, there will be inrush current. Once the insulation is charged (full test potential), the leakage current drops off to near zero mA. These features are used with a DC hipot or IR test. Due to the nature of a DC withstand test, setting high and low leakage limits can prove difficult.

What do you need to know about hipot testing?

Hipot Testing 102: Learning Objectives Dielectric Withstand or Hipot Test The Dielectric Voltage-Withstand Test, or Hipot (High Potential) Test, is designed to stress the insulation of your product far beyond what it will encounter during normal use.

Can a DC Hi Pot test read insulation resistance?

Note that a dc hi-pot tester uses high voltage and may be provided with a dc current meter. If the dc voltage is stable, then the current meter can be calibrated in ohms to read insulation resistance. Easy. Some commercial hi-pot testers include an insulation resistance function.

How to calculate the leakage current of an AC unit?

Because the insulation resistance and reactance of the stray capacitance is so high, the ac test current can be simplified to the leakage current at 250 V times the ratio of hi-pot test voltage to 250 V. If the test voltage is 3000, then the test current would be 3000/250 x 0.5 or 6 mA.