VAMP 221
Arc protection system
Technical description
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VM221.EN013
3.4.1.
Functional system description
The purpose of this application example is to demonstrate the
implementation of the arc protection light criteria using earth-
fault current.
The earth-fault current can be measured directly from the
summation connection of the instrument transformer, in which
case the sum of the phase currents is wired through the L2/I
0
current measuring channel. (Figure 3.4-1)
An alternative, more accurate, method is to connect a current
transformer that measures earth-fault current directly to the
L2/ I
0
current measuring channel.
