A Petersen coil compensated network usually uses directional sensitive earth fault protection. The user
needs to control its characteristics between varmetric and wattmetric; the selection is based on
whether the Petersen coil is connected when the network is compensated, or whether it is open when
the network is unearthed.
Figure. 5.5.1. - 65. Setting group control – one wire connection from Petersen coil status.
Depending on the application's requirements, the setting group control can be applied either with a
one wire connection or with a two wire connection by monitoring the state of the Petersen coil
connection.
When the connection is done with one wire, the setting group change logic can be applied as shown in
the gure above. The status of the Petersen coil controls whether Setting group 1 is active. If the coil is
disconnected, Setting group 2 is active. This way, if the wire is broken for some reason, the setting
group is always controlled by SG2.
AQ-E215
Instruction manual
Version: 2.01
© Arcteq Relays Ltd
96
Содержание AQ-E215
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