What is the primary function of an RCCB (Residual Current Circuit Breaker) in an electrical system?
Answer & step-by-step solution
An RCCB protects people against dangerous earth-leakage/residual current by comparing the currents in live and neutral conductors. If the imbalance exceeds its trip threshold, it disconnects the circuit rapidly.
Concept & Reasoning
In normal operation the vector sum of currents through the RCCB's sensing core is approximately zero. An earth fault or shock path diverts some current outside the neutral return, producing residual current that triggers the device. An RCCB by itself does not provide overload/short-circuit protection; it is commonly coordinated with an MCB/fuse or replaced by an RCBO when both functions are needed.
How to Solve It in the Exam
RCCB → residual/earth-leakage shock protection.
Important Exam Point
Remember RCCB ≠ MCB. MCB protects overcurrent; RCCB detects imbalance.
Quick Trick
RCCB → residual/earth-leakage shock protection.
Common Mistake
Selecting short-circuit protection as the primary RCCB function.
विद्युत प्रणाली में RCCB (Residual Current Circuit Breaker) का प्राथमिक कार्य क्या है?
उत्तर और चरणबद्ध हल
RCCB फेज़ और न्यूट्रल चालकों की धाराओं की तुलना करके खतरनाक अर्थ-लीकेज/अवशिष्ट धारा से लोगों की रक्षा करता है। असंतुलन ट्रिप सीमा से अधिक होने पर यह परिपथ तुरंत काट देता है।
विस्तृत हल (मूल भाषा में)
Concept & Reasoning
In normal operation the vector sum of currents through the RCCB's sensing core is approximately zero. An earth fault or shock path diverts some current outside the neutral return, producing residual current that triggers the device. An RCCB by itself does not provide overload/short-circuit protection; it is commonly coordinated with an MCB/fuse or replaced by an RCBO when both functions are needed.
How to Solve It in the Exam
RCCB → residual/earth-leakage shock protection.
Important Exam Point
Remember RCCB ≠ MCB. MCB protects overcurrent; RCCB detects imbalance.
Quick Trick
RCCB → residual/earth-leakage shock protection.
Common Mistake
Selecting short-circuit protection as the primary RCCB function.
વિદ્યુત પ્રણાલીમાં RCCB (Residual Current Circuit Breaker)નું પ્રાથમિક કાર્ય શું છે?
જવાબ અને પગલાવાર ઉકેલ
RCCB ફેઝ અને ન્યુટ્રલ વાહકોના પ્રવાહોની તુલના કરીને જોખમી અર્થ-લીકેજ/અવશેષ પ્રવાહથી લોકોનું રક્ષણ કરે છે. અસંતુલન ટ્રિપ મર્યાદાથી વધે તો તે સર્કિટ તરત કાપી નાખે છે.
વિગતવાર ઉકેલ (મૂળ ભાષામાં)
Concept & Reasoning
In normal operation the vector sum of currents through the RCCB's sensing core is approximately zero. An earth fault or shock path diverts some current outside the neutral return, producing residual current that triggers the device. An RCCB by itself does not provide overload/short-circuit protection; it is commonly coordinated with an MCB/fuse or replaced by an RCBO when both functions are needed.
How to Solve It in the Exam
RCCB → residual/earth-leakage shock protection.
Important Exam Point
Remember RCCB ≠ MCB. MCB protects overcurrent; RCCB detects imbalance.
Quick Trick
RCCB → residual/earth-leakage shock protection.
Common Mistake
Selecting short-circuit protection as the primary RCCB function.
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