System Overvoltages

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System Overvoltages
10106031010707 System Overvoltages
Causes of Overvoltages
Internal Causes Switching, faults and resonance are the main causes of internal overvoltages of a system. Theoretically, switching surge voltages may touch 4 p.u. but in actual system conditions, these voltages do not rise beyond 2.5 p.u. Studies reveal that statistically these overvoltages are normally distributed. Under sustained phase-earth fault conditions, temporary power frequency overvoltages arise. Phase voltage of healthy phases at fault or arrester location rise from 80 to…
Amarjit Singh Pabla: Electric Power Distribution, Sixth edition. System Overvoltages, Chapter (McGraw-Hill Professional, 2011), AccessEngineering Export