Introduction - GE MiCOM P40 Agile Technical Manual

Single breaker current differential (with distance)

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Chapter 8 - Carrier Aided Schemes

INTRODUCTION

The provision of communication channels between the terminals of a protected transmission line or distribution

feeder enables unit protection to be applied.

Protection devices located at different terminals can be configured to communicate with one another in order to

implement unit protection schemes. The exchange of simple ON/OFF command signals allows unit protection to

be achieved with Distance Protection schemes (Aided Distance), Directional Earth Fault schemes (Aided DEF) and if

applicable, Delta Directional Comparison Protection schemes (Aided Delta). Schemes where a communication

channel is used to send command signals between line ends are known as Carrier Aided Schemes.

The terms 'simplex' and 'duplex' are used to describe the type of communication channel used. Simplex

communication, also sometimes referred to as half-duplex, requires only a single communication channel

between line ends. Signals can be sent in both directions but not at the same time. Duplex communication requires

two communication channels between line ends (one in each direction). Duplex communication allows signals to

be sent and received at the same time.

P54x1i-TM-EN-1

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