SARFI Report
Summary

The System Average RMS Variation Frequency Index (SARFI) Report shows the count of voltage sags and / or swells for the selected sources based on the SARFI indices. Use this report to analyze voltage sag and / or swell incidents, to assess possible impacts on your facility or processes, and to help quantify the performance of power system.

Details

SARFI index is a power quality index that provides a count of voltage sags and / or swells for one or more selected sources. There are two types of SARFI indices: SARFI-X and SARFI-Curve:

  • SARFI-X corresponds to a count of voltage sags and / or swells below or above a specified voltage threshold. This report supports the following SARFI-X indices:
    • SARFI 10
    • SARFI 50
    • SARFI 70
    • SARFI 80
    • SARFI 90
    • SARFI 110
    • SARFI 120
    • SARFI 140

      For example, SARFI-70 counts the voltage sags that are below 70% of the reference voltage. SARFI-110 counts the voltage swells that are above 110% of the reference voltage. SARFI indices assess duration of RMS variation based on the selected duration.

  • SARFI-Curve corresponds to a rate of voltage sags below an equipment compatibility curve. This report supports the following SARFI Curves:

    • SARFI ITIC
    • SARFI SEMI

      For example, SARFI ITIC counts voltage sags that are below the lower ITIC curve. SARFI SEMI counts voltage sags that are below SEMI curve.

Prerequisites
  • The measurement data must be available as historical data logs in the database.
Report inputs
Example:

NOTE: This example only shows selected content from the report, it does not show the entire report.