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Use a megger or a insulation tester. Place one lead on any of the phases nd other lead the alternator boy. Observe the indicator. In megger it s good with infinity or it must be minimum 100M OHM, IF IT SHOWs 50 it could be coz of moisture in winding by heating the alternator the insulation resistance value may improve
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Vivi
LaoDiesel has no meaning it doesnt matter whether horses or squirrels turn the generator.
Diesel does leave a bunch of carbon in the air carbon does not insulate well.
you check insulation resistance with a megger
or a hi pot tester
the insulation of wax or plastic is far higher than air
so if there is a nick or hole in the insulation it may not be insulation at all at operating voltage and a vom checks resistance at 9v
the test voltage must be 2 times the operating voltage plus 1000v to test the insulation
so for a generator that can use 300V wiring devices
you will need a 1600V megger
a hi pot tester is better, you can plot current against voltage and get a prediction of when arcover will occur.
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Load test on single phase transformer?
The dc tests that can be done on a transformer are to measure the resistance of each windings and to measure the insulation resistance between the windings and between each winding and the transformer case.
What is difference between insulation resistance test and polarization index?
Insulation resistance test: This test is used to find the insulation resistance of motor for 1 min or 10 min through high voltage insulation tester. By this we can find the insulation level. Polarization index: This is the ratio between insulation resistance for 10 min to insulation resistance for 1 min.
What is the difference between insulation resistance and earth resistance?
insulation resistance can be measured by means of megger, with built in d.c generator. It is measured between the conductor and the earth. earth resistance can be measured by means of earth resistance tester. For good effective earthing, th earth resistance should be of order 0.5 ohm
What is insolation resistance?
I think you mean 'insulation resistance'. This is exactly what it says it is, it is the resistance between opposite sides of an insulator or dielectric. It is in the order of megohms and, in the case of a cable, is inversely proportional to its length -i.e. the longer the cable, the lower its insulation resistance.
What is the typical distance between the primary and the secondary windings of a transformer and how is it determined?
The primary and secondary windings of a transformer are generally wound around tubular-shaped 'formers', and are fitted, concentrically -in other words, they are installed one around the other, and over the same limb of the transformer's laminated core, with the higher-voltage winding outermost. The primary and secondary windings are not fitted separately over different limbs, as represented in schematic diagrams of transformers.In larger transformers, the two windings must have sufficient separation between them to allow for the circulation of oil. This oil has two purposes. The first is to provide insulation between the primary and secondary windings, over and above the insulation around the wound conductors. The second is to enable circulation for cooling -either by natural convection or by forced circulation.The actual separation between the primary and secondary windings depends upon the voltage differences between the two windings. Greater voltage differences require greater separation. Typically we are talking in terms of tens of centimetres.
