User manual 09/2009 - Schneider Electric

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User manual 09/2009 - Schneider Electric

The Protection FunctionLong Time ProtectionPresentationLong time protection on Micrologic 5 and 6 trip units is adapted to protecting all types of electricaldistribution application against overload currents.It is identical for Micrologic 5 and 6 trip units.Operating PrincipleLong time protection is I 2 t IDMT:• It incorporates the thermal image function.• It can be configured as the Ir pick-up and as the tr trip time delay.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-up2 tr Long time protection time delaySetting the Long Time ProtectionThe Ir pick-up can be set as follows:• On the Micrologic trip unit, preset by the Ir dial and fine-tuned on the keypad• Via the communication option using the RSU software, preset by the Ir dial on the Micrologic trip unitand fine-tuned via the RSU softwareThe time delay tr can be set as follows:• On the Micrologic trip unit, set on the keypad• Via the communication option using the RSU software40 LV434104 09/2009

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