How many types of relay are present in a VCB and ACB, what
are the tests we can conduct on both breakers and how to
set the relays values
Answers were Sorted based on User's Feedback
Answer / s naidu
in a vcb this are main relay
1-phase unbalance relay -2nos
2-earth leakege trip relay
3-TR common fault relay
in acb this are main relay
1-load balancing relay
2-u/o voltage relay
3-earth fault relay
4-master trip realy
this tests are carried out generally on both CB
i-cb in open & close position test
2-continuity of contacts
3-manual closing,electrical closing, remote closing
4-remote tripping though protection relays
5-check spring charging motors are in working
relays calibrated operating characteristics to electrical
circuits.
Is This Answer Correct ? | 54 Yes | 7 No |
Answer / vijaykumar
Protection of the feeders depends upon the load but not on
the type of breaker used.
VCB-measure the Contact resistance and breaking
resistance,tripping time other mechanical interlockings for
the breaker Mechanisms.
ACB-Check the contact reisitance and the contact tips which
are visible to naked eyes,arching chutes,since air is the
quenching media.
Is This Answer Correct ? | 12 Yes | 5 No |
Min and max capacities of VCB,ACB,ACCB,OCB,MCCB and MCB
why is the earthing pin on 3 pin top are big and thick
what is the purpose of NGR?
How much must be gape bitween 2 cable on cable tray?
Electrical Design specifications
DEAR SIR/MADAM,CLEARLY EXPLAIN ABOUT CRAWLING AND COGGING EFFECTS IN INDUCTION MOTOR.
how can see the ac indoor or out door ac which Tr
difference b/w timer and counter
i have dry type transformers can you help me that how many tests i can do to know the performence of transformer and also please tell me about the BDV test and Insulation resistance test in oil cooled transformers
What Is HO factor in power selection
define digital electronic
what is the difference between inrush curent and jurk load.