Join 60,000+ competitive exam aspirants
or with email
Your Cart
Subtotal₹0
Total₹0
Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
Join 60,000+ competitive exam aspirants
Abnormalities occurs due to
Overloading of equipment
Unbalance loading
Loose connection
Any of above
Any of above
Quick Summary: Abnormalities in a power system refer to any operating condition that deviates from the normal, balanced, and rated state. These deviations can lead to equipment damage, instability, or hazardous conditions, requiring protective relays and circuit breakers to isolate the faulty section.
Abnormalities in a power system refer to any operating condition that deviates from the normal, balanced, and rated state. These deviations can lead to equipment damage, instability, or hazardous conditions, requiring protective relays and circuit breakers to isolate the faulty section.
Ploss=I2R — Power loss due to resistive heating in connections or overloads
I2=31(Ia+a2Ib+aIc) — Negative sequence current resulting from unbalance
Abnormalities like overloading cause heating (I2R losses), which degrades insulation. Unbalanced loading creates negative sequence components leading to torque pulsations in rotating machines. Loose connections manifest as high-resistance paths, causing localized arcing and overheating at junctions.
Overloading leads to thermal degradation of winding insulation.
Unbalanced loading affects the performance of induction motors by creating counter-rotating magnetic fields.
Loose connections are a common source of fire hazards and electrical noise in distribution panels.
Protection systems are designed to detect these anomalies through sensing elements like CTs and PTs.
Ensures safety of personnel and equipment
Prevents catastrophic system failure
Adds complexity and cost to power systems
May cause unnecessary tripping if not properly coordinated
Distribution switchgear
Transmission line protection
Industrial motor control centers
An abnormality is any condition that results in currents or voltages exceeding their permissible design limits.
Option D is correct because all listed factors directly contribute to system degradation or failure states requiring intervention.
D is correct — Overloading, unbalanced loading, and loose connections are all significant abnormalities that threaten the integrity of electrical equipment.
In competitive exams, always identify if a question asks for the 'root cause' vs 'symptom'. Here, all three options represent distinct causal factors for electrical stress.