Arcing Grounds
Arcing Grounds is a phenomenon which is
observed in ungrounded three phase systems. In ungrounded three phase systems
operating in a healthy balanced conditions, capacitances are formed between the
conductors and ground. The voltage across these capacitances is the phase
voltage.
Now, in the event of a ground fault, the
voltage across the faulty conductor becomes zero while the voltages across the
healthy conductors increase by a factor of 1.732.
The arc caused between the faulty conductor and
the ground gets extinguished and restarts many times, this repeated initiation
and extinction of the arc across the fault produces severe voltage oscillations
of the order of nearly three to four times the nominal voltage.
This repeated arcing across the fault due to
the capacitances between the conductors and the ground is known as arcing
grounds. Arcing grounds can be eliminated by the use of Peterson Coils (see
Article) and Arc Suppression Coils
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