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Protection of PV System: Differences Between MCB and RCCB

This document discusses protection systems for PV systems and compares two types of circuit breakers - MCBs and RCCBs. MCBs are electromechanical devices that protect against overcurrents, can be manually reset, and easily detect faults. RCCBs can disconnect in just 20 milliseconds when an imbalance in electric current is detected, making them effective for controlling low voltage circuits. The document also discusses earthing systems, showing the grounding electrode that connects equipment to the earth and how to measure earth resistance.

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37 views3 pages

Protection of PV System: Differences Between MCB and RCCB

This document discusses protection systems for PV systems and compares two types of circuit breakers - MCBs and RCCBs. MCBs are electromechanical devices that protect against overcurrents, can be manually reset, and easily detect faults. RCCBs can disconnect in just 20 milliseconds when an imbalance in electric current is detected, making them effective for controlling low voltage circuits. The document also discusses earthing systems, showing the grounding electrode that connects equipment to the earth and how to measure earth resistance.

Uploaded by

mohd
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Protection of PV system

In this section protection system, types of switches and earthing, are discussed. Two
types of CB are used in PV system as shown in previous schematic diagram, MCB and RCCB.

Figure 2 view of RCCB Figure 1 view of MCB

Differences between MCB and RCCB:


MCBs are electromechanical devices which are used to protect an electrical circuit from an
overcurrent. It can be reclosed without any hand-operated restoration. MCB is used as an option
to the fuse switch in most of the circuits. Unlike a fuse, MCB does not have to be replaced
every time after a failure as it can be reused.

Another huge advantage of MCBs is that the detection of a problem is easy. Whenever
there is a fault in the circuit, the switch comes down automatically and we are hereby informed
that there was a fault. We can then manually go and put the MCB back up and the electricity
will start flowing again.

RCCB is basically an electric wiring that trips or disconnects when imbalance or


mismatch in electric current is detected. The best part about RCCB is that it does not take much
time to take the control over the imbalanced electric current; RCCB takes only about 20
milliseconds to trip. RCCB is essentially a current sensing equipment that is used to control the
low voltage circuit from the fault. It comprises a switch device which is used to turn off the
circuit when there is a fault.
Figure 3 view of MCCB 400A

Earth Connection
The metallic device used to contact the earth is the grounding electrode. The conductor
that connects the central grounding point (where the equipment grounding system is connected
to the grounded circuit conductor on grounded systems) and a grounding electrode that is in
contact with the earth is known as the grounding electrode conductor (GEC).

The resistance of grounding system must be 5 ohm and not exceed this value. The following is
the circuit to measure the earth resistance.
Figure 4 view of circuit to measure the earth resistance.

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