Let s clarify our use of the term current.
Insulation resistance test procedure.
The insulation resistance test is an electrical test which uses a certain type and level of voltage 500v d c.
General testing information for single conductor non shielded cable on a reel insulation resistance testing cannot be.
For low voltage installations i e.
The test measures the insu lation resistance between the phases and or between phase and ground.
Set the voltage level of the insulation resistance tester to 500v.
1 insulation resistance ir this is the simplest of the tests.
The measured resistance indicates the condition of the insulation between two conductive parts.
The insulation resistance test is the second test required by the electrical safety testing standards.
What is insulation resistance testing.
The insulation keeps the current flowing along the wire exactly as intended.
Insulation resistance testing is a non destructive test procedure.
With a little record keeping and common sense however you can get a good picture of the insulation condition from values that are only relative.
1 short time or spot reading test.
Tests are typically conducted by applying a direct current dc voltage to the conductor under test and measuring the current that flows through insulation called the leakage current and into the non current carrying metal parts of equipment.
Check full load amps flas with the appropriate meter when the motor is turned on or with a full preference clamp meter unnamed napplet fla.
Using insulation testing with an instrument such as the fluke 1555 10 kv insulation tester combined with fluke connect technology such leaks can be detected as insulation resistance slowly tapers over time a sign of normal and expected deterioration.
Basically you re applying a voltage specifically a highly regulated stabilized dc voltage across a dielectric measuring the amount of current flowing through that dielectric and then calculating using ohm s law a resistance measurement.
Insulation resistance decreases in temperature or moisture.
After the required connections are made you apply the test voltage for a period of one min.
Carried out by applying a dc voltage with a smaller amplitude than for dielectric testing it yields a result expressed in kw mw gw or tw.
It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs.
Developed early in the 20th century the insulation resistance ir test is the oldest and most widely used test for assessing the quality of insulation.
The insulation resistance test consists in measuring the insulation resistance of a device under test while phase and neutral are short circuited together.
The minimum test value of motor insulation resistance is 1 meg ohm 1 mh.
The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.
Check the motor frame earth from phase to phase u to e v to e w to e.
