1 CHAPTER OVERVIEW
The primary purpose of this product is not overcurrent protection. It does however provide a range of current
protection functions to be used as backup protection. This chapter assumes you are familiar with overcurrent
protection principles and does not provide detailed information here. If you require further information about
general overcurrent protection principles, please refer either to General Electric's NPAG publication, earlier
incarnations of this technical manual, or one of our technical manuals from our P40 Agile Modular distribution
range of products such as the P14x.
This chapter contains the following sections:
Chapter Overview 365
Phase Fault Overcurrent Protection 366
Negative Sequence Overcurrent Protection 369
Earth Fault Protection 372
Sensitive Earth Fault Protection 377
High Impedance REF 382
Thermal Overload Protection 384
Broken Conductor Protection 389
Transient Earth Fault Detection 391
P543i/P545i Chapter 13 - Current Protection Functions
P54x1i-TM-EN-1 365
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