1 CHAPTER OVERVIEW
This product provides biased, phase-segregated, numerical Current Differential protection.
This chapter introduces the principles and theory behind Current Differential protection and describes how they
are implemented in this product. Guidance for applying this protection is also provided.
The current differential protection is enabled by default, but it can be disabled if you don’t want to use it. The
current differential protection needs digital communications links to exchange the values of current between the
terminals in the scheme.
This chapter contains the following sections:
Chapter Overview 99
Current Differential Protection Principle 100
Synchronisation of Current Signals 102
Phase Current Differential Protection 105
Neutral Current Differential Protection 108
Three-Terminal Schemes 109
Transient Bias 111
Capacitive Charging Current Compensation 112
CT Compensation 113
Feeders with In-Zone Transformers 114
Current Differential Intertripping 123
Stub Bus Differential Protection 124
Application Notes 125
P543i/P545i Chapter 6 - Current Differential Protection
P54x1i-TM-EN-1 99
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