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Triping principle of ELCB&RCCB? wht is the difference
between these two?
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Answer Posted / k.prakashchandra
ELCB requires earth connection. Earth wire is taken through
ELCB to the body of the appliance.If there is any leakage
current in the earth wire ,it will trip.4 pole or 2 pole
RCCB requires neutral.It works on the principle that vector
sum of the currents in phases and neutral is zero or current
balancing.If there is any leakage current to the earth it
will be sensed by only phase and not the neutral resulting
in tripping.3 pole RCCB is for a 3 phase load without neutral.
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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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