HV Exit Exam • Set 5 Question 20 of 30
Electro-mechanical breakdown of solid insulating materials under intense electrostatic fields occurs primarily due to:
✓
Direct Answer
Option C: Mechanical compressive stresses produced by strong electrostatic attraction
Electro-mechanical breakdown occurs when the electrostatic compressive force (Maxwell stress) between opposite electrodes exceeds the mechanical compressive yield strength of the solid dielectric.
All Options
A
Magnetic hum
B
Chemical oxidation
C
Mechanical compressive stresses produced by strong electrostatic attraction
(Correct Answer)
D
Ambient airflow turbulence
Detailed Explanation & Context
Electro-mechanical breakdown occurs when the electrostatic compressive force (Maxwell stress) between opposite electrodes exceeds the mechanical compressive yield strength of the solid dielectric.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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