What protective relay detects imbalances between incoming and outgoing currents in HV generator windings?
Direct Answer
Option A: Differential Protection Relay (87G)
Differential protection (87G) monitors the current entering and leaving the generator windings. Per IEC 60092-503, any discrepancy indicates an internal fault, such as a phase-to-ground or phase-to-phase short. This relay provides high-speed, selective tripping to isolate the faulty generator before catastrophic damage occurs to the stator core.
All Options
Detailed Explanation & Context
Differential protection (87G) monitors the current entering and leaving the generator windings. Per IEC 60092-503, any discrepancy indicates an internal fault, such as a phase-to-ground or phase-to-phase short. This relay provides high-speed, selective tripping to isolate the faulty generator before catastrophic damage occurs to the stator core.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
Practice Full HV Set 1
Test yourself with 30 interactive questions, live timer, and instant score.