1 CHAPTER OVERVIEWThe primary purpose of this product is not overcurrent protection. It does however provide a range of currentprotection functions to be used as backup protection. This chapter assumes you are familiar with overcurrentprotection principles and does not provide detailed information here. If you require further information aboutgeneral overcurrent protection principles, please refer either to General Electric's NPAG publication, earlierincarnations of this technical manual, or one of our technical manuals from our P40 Agile Modular distributionrange of products such as the P14x.This chapter contains the following sections:Chapter Overview 365Phase Fault Overcurrent Protection 366Negative Sequence Overcurrent Protection 369Earth Fault Protection 372Sensitive Earth Fault Protection 377High Impedance REF 382Thermal Overload Protection 384Broken Conductor Protection 389Transient Earth Fault Detection 391P543i/P545i Chapter 13 - Current Protection FunctionsP54x1i-TM-EN-1 365
