User manual 09/2009 - Schneider Electric

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User manual 09/2009 - Schneider Electric

The Protection FunctionOperating PrincipleNeutral protection has the same characteristics as those for phase protection:• Its pick-up can be configured in proportion with the long time Ir and short time Isd protection pick-ups.• It has the same trip time delay values as the long time Ir and short time Isd protections.• Instantaneous protection is identical.Tripping curve:No. Parameter Description0 In Trip unit setting range: The maximum setting corresponds to the trip unit In rating1 Ir Long time protection pick-up10 IN Neutral protection pick-upSetting the Neutral Protection4-pole trip unitThe IN pick-up can be set as follows:• On the Micrologic trip unit, using the keypad• Via the communication option, using the RSU software3-pole trip unitNeutral declaration and the IN pick-up can be set as follows:• On the Micrologic trip unit, using the keypad• Via the communication option, using the RSU softwareLV434104 09/2009 49

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