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Examoogle • User • info@examoogle.com • EE-2024-8821
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Which of the following is advantage of HRC fuse?
No ageing effect
High speed
Both A and B
None of above
Both A and B
Quick Summary: High Rupturing Capacity (HRC) fuses are advanced protective devices designed to interrupt high short-circuit currents safely. They exhibit no ageing effect, meaning their performance remains consistent over time, and they offer extremely high-speed operation during fault conditions.
High Rupturing Capacity (HRC) fuses are advanced protective devices designed to interrupt high short-circuit currents safely. They exhibit no ageing effect, meaning their performance remains consistent over time, and they offer extremely high-speed operation during fault conditions.
Iarc=∫Rarc(t)v(t)dt — represents the arc current quenching process
tc=tp+ta — where tp is pre-arcing time and ta is arcing time
The HRC fuse operates by melting a silver element embedded in quartz sand when fault current flows through it. The energy of the arc is absorbed by the surrounding granular quartz, which quenches the arc rapidly through vapor condensation and chemical reaction. This process ensures precise current limitation and fast interruption, preventing damage to downstream equipment.
HRC fuses are capable of clearing short-circuit currents up to the rated breaking capacity.
The silver element provides low resistance during normal operation, minimizing I2R losses.
Quartz sand acts as an arc quenching medium by absorbing thermal energy.
They provide reliable protection against both overloads and short circuits.
High speed of operation under fault conditions.
No ageing effect ensuring consistent protection.
Clear indication of operation (if equipped with a trip indicator).
High rupturing capacity for large industrial systems.
Fuse elements must be replaced after every operation.
Higher initial cost compared to simple rewireable fuses.
Industrial distribution systems
Transformer protection
Motor starter circuits
The 'HRC' in HRC fuse stands for High Rupturing Capacity, referring to its ability to break currents as high as 80kA to 100kA.
Option A is correct because the silver element does not undergo oxidation or deterioration like conventional copper fuse wires.
Option B is correct because the fuse element is designed to melt almost instantaneously upon detecting a fault.
C is correct — HRC fuses are characterized by their lack of ageing effect and their high-speed operation, which collectively make them superior to conventional fuse types.
Always remember that HRC fuses are primarily used in high-voltage and high-current power distribution where protection reliability is critical.