User manual 09/2009 - Schneider Electric

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User manual 09/2009 - Schneider Electric

The Protection FunctionGround Fault ProtectionPresentationGround fault protection on Micrologic 6 trip units is adapted to protecting all types of electrical distributionapplication against ground fault currents in the TN-S system.For more details on ground fault currents, see the Compact NSX circuit breakers - User manual.Operating PrincipleGround fault protection is definite time:• It incorporates the possibility of an I 2 t inverse time curve function• It can be configured as Ig pick-up and as tg trip time delay.Tripping curve:No. Parameter Description0 In Trip unit setting range: Minimum setting/maximum setting = trip unit In rating7 Ig Ground fault protection pick-up8 tg Ground fault protection time delay9 I 2 t Ground fault protection I 2 t curve in ON or OFF positionSetting the Ground Fault ProtectionThe Ig pick-up can be set as follows:• On the Micrologic trip unit, preset by the Ig dial and fine-tuned on the keypad• Via the communication option using the RSU software, preset by the Ig dial on the Micrologic trip unitand fine-tuned via the RSU softwareThe tg time delay can be set as follows:• On the Micrologic trip unit, set on the keypad• Via the communication option using the RSU softwareThe tg time delay setting incorporates activation/deactivation of the I 2 t option.46 LV434104 09/2009

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