Rockwell-automation 193-EC4 EC4 Current Monitoring Relay User Manual Manual do Utilizador descarregar pdf (Página 81)

Rockwell Automation Publication 193-UM011A-EN-P - September 2010 82

Chapter

Current Monitoring Parameters

Introduction

This chapter provides information for the current monitoring parameters of the

EC4 Current Monitoring Relay.

Phase Current Reporting

Current Range

The EC4 Current Monitoring Relay utilizes a true RMS algorithm to calculate

the RMS value of the current passing through phase L1, L2, and L3. The relay is

capable of sensing and reporting currents ranging from 0% to 720% of the

maximum current rating.

The following chart illustrates the reporting current precision, the minimum and

maximum reporting current values, and the 720% maximum current rating value

for each current range.

IMPORTANT

The EC4 Current Monitoring Relay will report 0 A if the current is

below 30% of the minimum current rating.

IMPORTANT

The EC4 Current Monitoring Relay is capable of reporting values

greater than 720% of the maximum current rating, but the accuracy of

the value may be compromised.

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Rockwell-automation 193-EC4 EC4 Current Monitoring Relay User Manual Manual do Utilizador Página 81