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A serious electrical fault such as a short circuit, earth fault, or phase-to-phase fault, causes the current to rise rapidly to dangerous levels because the circuit impedance drops sharply.
This excessive current can damage cables, transformers, motors, and switchgear while creating hazards such as arc flash, fire, and equipment failure.
Protection devices, including
continuously monitor the system and detect the abnormal condition within milliseconds. The relay sends a trip signal to the circuit breaker, which opens its contacts and interrupts the fault current, isolating only the affected section of the network.
This fast and coordinated response protects equipment, reduces safety risks, and helps maintain power supply to healthy parts of the electrical system.
Proper fault protection is essential for ensuring personnel safety, equipment reliability, and overall power system stability in industrial and utility installations.