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why CT ratio stand for 50/5, 100/5, 25/5.
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Answer Posted / brijesh kumar singh
this is simply a current ratio. here 50 amp gives an
primary and 5 amp gives as secondry. basically CT is used
for the mesurement of tempratue and the maximum rating of
any indicating type ammeter can be 5 amp so here is being
used 50/5 n ../5,../5
| Is This Answer Correct ? | 5 Yes | 16 No |
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When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<
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