Answer Posted / baikunth
As we know DC current is uni-directional.The deflection
system attached to the megger is generally PMMC type which
eorks only with DC. Another reason is when DC current flows
in the winding of a motor or transformer the capacitance and
inductance do not act upon the current and the only leakage
current that flows through the insulation is measured.This
gives faster and accurate measurement.If we use an AC megger
the reading will be erroneous because the capacitance of
winging will allow to flow high current and breakdown of
insulation will not occur due to alternating action of
current.
Is This Answer Correct ? | 20 Yes | 2 No |
Post New Answer View All Answers
hi frnz,can somebody give me any project work? i am a 2nd year student & interested in practical works...plz give me some projects
what is difference between line differential and transformer differential?
What is Diff btw Fire Alarm & VESDA System???
For small size, high frequency coils, the most common core material is- a. )Air b. )Ferrite c.) Powdered ion d.) Steel
Damping resistor provided in open delta (tartiary) winding of a measuring PT at the incoming of a MV inverter drive panel is getting heated up. Can any body explain the reasons and suggest the remedy?
Can you any one explain application of buccholz relay operation and pressure relif device operation of power transformer
WHAT IS THE CURRENT CARRYING CAPACITY OF 2.5/3 CORE HI TUFF CABLE,WILL IT SAFLEY CARRY 8.6 AMPS OVER 120 METRES,CAN YOU ALSO ANSWER WITH FORMULA FOR WORKINGS OUT ,THANK YOU 3RDYR APPRENTICE.
What is the problem of internal failure in ship engine telegraph system norcontrol?
how u measure/calculate renge of capacitor,capacitor has no any rating tag.what is the theory of measure of capacitons.
how to check avr of dg set of 125kva
how to calculate transformer load?
how to find 5 kilo meter long under ground 33 kv cable fault location if IR VALUE shows 0.05 M ohm @5000 volt.and cable fault locator shows some time fault distance 3 kilo meter ,3.7 kilo meter and some time 1 kilo meter? now how to find the fault location that where is leakage. note--it is tested with 5000 kv megger and insulation resistance is 0.05 M ohm. and some time 0.03 M ohm comes.
in a silicon diode we can measure .7v in a voltmeter.but why we can't use this voltage for using?
description about dry type transformers
why ahould you show client/engineer activities clearly on the project plan