why we are testing cables with DC supply not with AC supply?
- 9 Answers
- 28242 Views
- Aurobindo, DEWA, L&T, I also Faced
- E-Mail Answers
Answer Posted / vineeth kumar c g
in the case of insulation tester (megger) we need to take care of cable insulation resistance not insulation impedance, so we choose DC rather than AC.
In hipot test we give high voltage to the cable and if cable is twisted type then AC will induce an emf due to flux and this will change the value of impedence... (if you only need to measure resistance only)
skin effect may occurs if the frequency is higher than 50 and long length cables.
normally in site DC voltages are used for testing but in manufacturing industry they also use AC tester to calculate impedence also...
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
Can we put 3 layers of cable tray while installing tray
what is charger supervision and control supervision?
If a transformer primary winding operates at 240v, the secondary at 120v and the load is 1500w & the transformer is rated at 92% efficient, what's the current flowing through the primary winding of the transformer? What is the formula for finding this?
Is there possible to Test Transformer for Overfluxing Capability. Or is there any firm who does Overfluxing Test on Transformer?
when ID fan will immediately stop through VFD what exactly cause and problem the ID fan
I have done my m.tech in electrical engg discipline. Can any one please suggest me how should I prepare for getting into phd in iit or nit.How should I prepare for getting into lecturership
The advantages of Magnetic flux leakage technique over Ultrasonic technique for non distructive testing of material.
why core is useful for a transformer ?and also in its operation ?
Any Electrical Engineering jobs?Please refer for interviews. Thank you
A Generator is in running condition and Rotor earth fault alarm is coming.How to check on line(i.e in running condition) whether there is actual earth fault in rotor or not.
What do you mean by lighting transformer?
What is the tube exial fan?
Define characteristics impedance?
When we connect the large capacitor bank in series ?
how to find the capacitance value of the motor while running??
