Book Protection - Alstom

INTRODUCTION

MICOM P120, P121, P122 and P123 relays have been designed to provide more functionality in terms of protection, measuring, automatic operation and order control in any medium voltage electric network

These relays can be used in industrial and distribution network applications, as well as in high voltage and extremely high voltage protection applications. The specific nature of these relays makes it possible to respond to the various cases of application: energy intake, medium voltage subscriber, cable outlet, overhead line

The earth and phase protection functions comprise instantaneous information and time delay information. The first can be used in logic blocking diagrams so as to optimise the performance of the protection schemes, thus reducing triggering times

The second can be either of the constant type or of the dependent type (IEC, ALSTOM, ANSI/IEEE and C0). This wide choice of characteristics of triggering times makes it possible to easily adapt these relays to an existing protection scheme, irrespective of the other relays already installed on the network

 MICOM

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