why we are testing cables with DC supply not with AC supply?
- 9 Answers
- 28181 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
What are the advantages of vscf wind electrical system?
How to do fabrication , busbar and wiring cost for : 1. LT Panels 2. C& R Panel
What type of core material is used for metering C.T and protection C.T???
How to measure current and voltage in an ELV circuit
Why power genaration in India is at 50HZ while America its 60HZ
what is doid
What is the necessary and sufficient condition for stability.
If symmetrical fault occurs at the terminal of a synchronous motor then how the motor will act...explain it..
What are the types of the glands and difference between single and double compression type of cable Glands.
why ht motors are star connected?
BSNL TTA EXAM QUESTION
The metal-enclosed switchgear and controlgear is subdivided into three types: 1. metal-clad switchgear and controlgear; 2. compartmented switchgear and controlgear 3. cubicle switchgear and controlgear. What is the main differnence between them. State some example.
What are the different types of transformers?
Why PS class CT is always preferred for Differential protection?
What are the main significances of root locus?
