Stage With Definite-Time Characteristic Curve; Description - Siemens 6MD85 Manual

Siprotec 5 high-voltage bay controller

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Table of Contents

Protection and Automation Functions

7.8 Overcurrent Protection, 1-Phase

Stage with Definite-Time Characteristic Curve

Logic of a Stage

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Figure 7-123

Method of measurement

You use the Method of measurement parameter to define whether the stage uses the fundamental

comp. or the calculated RMS value.

Measurement of the fundamental component:

This method of measurement processes the sampled current values and filters out the fundamental

component numerically.

Measurement of the RMS value:

This method of measurement determines the current amplitude from the sampled values according to

the defining equation of the RMS value. Harmonics are included in the analysis.

Logic Diagram of the Definite-Time Overcurrent Protection, 1-Phase

SIPROTEC 5, High-Voltage Bay Controller, Manual

C53000-G5040-C015-9, Edition 11.2017