Question
Download Solution PDFWhat is the primary function of a voltage differential relay in an electrical protection system?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is: 4) It detects the difference in voltage between two or more points and trips the system if the voltage difference exceeds a set threshold.
Explanation:
The primary function of a voltage differential relay is to:
- Compare voltages at two or more points in the system (e.g., across a transformer winding, busbar, or transmission line).
- Detect imbalances (differences) in these voltages.
- Trip the circuit breaker if the voltage difference exceeds a predefined threshold, indicating a fault (e.g., short circuit, open circuit, or insulation failure).
Option Analysis
Phase angle differences in currents → This describes a phase comparison relay, not a voltage differential relay.
Impedance measurement → This is the function of an impedance relay (used in distance protection).
Current entering/leaving a zone → This describes a current differential relay, which operates based on Kirchhoff’s current law (not voltage).
Thus, the correct choice is 4).
Last updated on Jun 7, 2025
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