DC Hipot Test Methods

IC&#;Capacitive

Capacitive (or geometric capacitive) current is also called inrush current. The windings have capacitance. Current is required to elevate its voltage potential. Capacitive current typically drops to zero within seconds after the test voltage provided by the motor tester is stable.

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IA&#;Absorption

Absorption current is present during atomic and any molecular polarization of the insulation, and is the current of interest during a PI test. This current will drop to zero, or near zero, over a period of time that varies by motor. The drop can happen in seconds or may take 10 minutes or more. 

IG&#;Volume Conduction

Volume conduction current is the current that flows through the entire volume of the insulation between ground and the conductors. In good windings, this current is usually zero or near zero, and depends on the composition and condition of the insulation system. People sometimes think of this current as &#;leakage&#; current. The volume conduction current certainly leaks through the insulation, but the surface conduction current (IL) is usually the main leakage in a used motor.

IL&#;Surface Conduction

Surface conduction current is often referred to as surface leakage current. The surface conduction current runs over the end winding surfaces of the insulation.

• Surface conduction is a result of surface contamination, dirt and moisture on the windings that are connected to ground.
• As the contamination level increases, the resistance of the contamination drops, and the current increases.
• As the voltage increases, the current increases more or less proportionally with the voltage applied by the motor tester.
• For used, good motors, this current will dwarf the absorption and volume conduction currents because of the relatively lower resistance in the surface contamination.
• For new, totally clean, and dry motors this current should be zero or near zero.

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In this blog, we will talk about how to do Hipot testing, a standard safety test that checks both the user&#;s safety and the insulation health of the test object.

Importance of HIPOT Testing

The hi-pot tester is a non-destructive way to see if the electrical insulation can handle a typical surge in voltage. This high-voltage test is done on all devices for a set amount of time to ensure that the insulation is not weak.

Using a hi-pot tester can help you find insulation and wire strands and problems with the spacing between the wire and the terminals. They can also help you find conductive or corrosive contaminants around the conductors and problems with terminal spacing and cables. Insufficient creepage and clearance distances were added during the manufacturing process.

Test method for HIPOT Test

Hipot testers usually connect one side of the supply to a safe ground for people to touch, like a wall. The other side of the power supply is connected to the conductor being checked. There are two places where a conductor can be connected: high voltage or ground.

When more than two contacts need to be hipot tested, you connect one reference to high voltage and all other communications to the ground. In this way, you can ensure that a contact is not linked to any further contact.

Pre-Testing Arrangements for Hipot Testing

• Make sure that the instrument&#;s body is anchored to the ground properly.
• Previous testing data and logs can be used as a reference.
• Make sure the test location/area has enough light/illumination.
• A wooden bench or table where you can put your instrument is on it.
• Mains power with proper grounding
• With suitable test leads and no signs of wear and tear.
• A multimeter should be available to check the continuity of test items. Leads
• Before touching the test object, you need to use a discharge rod.
• For your safety, wear gloves, safety glasses, a helmet, and safety shoes.
• People who work with the kit should stand on an HV-insulated rubber mat while they do their work.
• Make sure there is enough earthing. Earth spikes are needed for more earthing.
• Keep a safe distance from the HV Terminals when you are using HV.

Audio-visual signs and barriers can tell people to stay away while injecting HV. All of the hi-pot testing equipment sold by professionals are made to work, and the features listed above make the kits stand out from those of other competitors.

For more DC hipot test kit for capacitorsinformation, please contact us. We will provide professional answers.