The resistance of the fault affects the size of the voltage drop during a fault. In direct earth fault the
zero sequence voltage amplitude is equal to the system's line-to-earth voltage. In direct earth fault the
voltage of a faulty phase drops close to zero and healthy phase voltages increase to the amplitude of
line-to-line voltages.
Petersen coil earthed (Compensated) network (32N)
There are many benefits to a Petersen coil earthed network. The amount of automatic reclosing is
highly decreased and the maintenance of the breakers is therefore diminished. Arc faults die on their
own, and cables and equipment suffer less damage. In emergency situations a line with an earth fault
can be used for a specific time.
Figure. 5.4.5 - 38. Angle tracking of I0dir> function (Petersen coil earthed network model).
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
88
© Arcteq Relays Ltd
IM00021
Summary of Contents for AQ-M257
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