elcb means earth leakage circuit breaker which operates when
there is a leakage of current from phase to earth.
Rccb means residual current circuit breaker which operates
when there is a difference in current between any two
phases.This differential current is called resdual current.
ELCB is a voltage operated device.RCCB is a current
operated device.IN ELCB, Trip coil is connected between
system ground and non current carrying part of the
machines.RCCB having CBCT(Core Balanced Current
Transformer).CBCT consists of 2nos of primary winding
(P1,P2) and one secondary winding(S1).Primary windings are
in series with the load and secondary winding connected to
Trip coil.In case of healty time, voltage in both the
primary windings will be cancelled and hence no voltage on
secondary winding.During the leakge or If any body touch
the live wires of the machines, current will passing
through the body and connected to ground.It will cause the
voltage difference in primary windings and induced voltage
in secondary operates the trip coil(operating time 50ms).
ELCB:-An ELCB is a specialised type of latching relay that
has a building's incoming mains power connected through its
switching contacts so that the ELCB disconnects the power
in an earth leakage (unsafe) condition.The ELCB detects
fault currents passing from live (hot) to the earth
(ground) wire within the installation it protects. If
sufficient voltage appears across the ELCB's sense coil, it
will switch off the power, and remain off until manually
reset. An ELCB however, does not sense fault currents
passing from live to any other earthed body.
RCCB:-A residual current device (RCD), or residual current
circuit breaker (RCCB), is an electrical wiring device that
disconnects a circuit whenever it detects that the electric
current is not balanced between the phase ("hot") conductor
and the neutral conductor. Such an imbalance is sometimes
caused by current leakage through the body of a person who
is grounded and accidentally touching the energized part of
the circuit. A lethal shock can result from these
conditions; RCDs are designed to disconnect quickly enough
to mitigate the harm caused by such shocks.
ELCB earth leakage circuit breaker
RCCB residual current circuit breaker which operates
when there is a difference in current between any two
phases.This differential current is called resdual current.
rccb:-it measures the difference in current between live
and neautral conductors of a system.in normal conditions it
is equal.If it is diff. than it indicates that some current
is flowing other than live and neutral
Elcb;-it measures the voltage on earth conductor.If this
voltage is not zero that indiacate a leakage to earth
ELCB:ELCB IS AN EARTH LEAKAGE CIRCUIT BREAKER WHICH CHEAK
THE LEAKAGE OF CURRENT TO THE EARTH AND TRY TO BREAK THE
CIRCUIT POWER.
RCCB:RCCB IS AN RECIDUAL CURRENT CIRCUIT BREAKER WHICH
CHEACK THE ELECTRICAL CURRENT DIFFERENCE BETWEEN TWO PHASES
IT WILL BREAK THE CICUIT POWER
My switchgear busbar is rated at 2000A and just imagine the actual load on busbar is 1000A. From that busbar there are 10 outgoing feeders. Now the question is will the load be 1000A on each outgoing feeder or 100A per outgoing feeder. 2nd thing how do i calculate the load on individual feeder. Thanks for your time. Please provide some clarification on this issue.
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