7EN02-0290-11

Power Harmonics Module

The Power Harmonics module provides an in-depth analysis of power system parameters for a selected harmonic.

Module icon

Overview

The module measures voltage and current levels for the selected harmonic, and derives kW, kVAR, kVA, Voltage Angle, Current Angle and Phase Angle values for each phase.

NOTE: The registers and settings available in this module depend on the device or node you are configuring, as well as its firmware and template versions. Not all registers or settings are available on all devices or the Virtual Processor, and labels may vary.

Inputs

V1FFT, V2FFT, V3FFT

The V1FFT, V2FFT and V3FFT inputs are fixed. They receive phase voltage information from the FFT module.

I1FFT, I2FFT, I3FFT

The I1FFT, I2FFT, and I3FFT inputs are fixed. They receive phase current information from the FFT module.

Enable

All Power Harmonics modules have one programmable input called Enable. When this register is set to true, the module is enabled. When it is set to false, the module is disabled; it ceases to calculate power values and its output registers become N/A. This input is optional; if you leave it unlinked, the module is enabled by default.

Setup registers

Harmonic Number

This register specifies which harmonic to calculate parameters for. Any harmonic from the fundamental to the device’s maximum can be selected. The fundamental, or 1st harmonic, is selected by default.

Output registers

V1, V2 and V3

These numeric output registers hold the RMS phase voltage values for the harmonic specified in the Harmonic Number setup register.

I1, I2 and I3

These numeric output registers hold the RMS phase current values for the harmonic specified in the Harmonic Number setup register.

kW1, kW2 and kW3

These numeric registers hold the kW values for each phase at the harmonic specified in the Harmonic Number setup register.

kW Total

This numeric register holds the total kW value for all phases at the harmonic specified in the Harmonic Number setup register.

kVAR1, kVAR2 and kVAR3

These numeric registers hold the kVAR values for each phase at the harmonic specified in the Harmonic Number setup register.

kVAR Total

This numeric register holds the total kVAR value for all phases at the harmonic specified in the Harmonic Number setup register.

kVA1, kVA2 and kVA3

These numeric registers hold the kVA values for each phase at the harmonic specified in the Harmonic Number setup register.

kVA Total

This numeric register holds the total kVA value for all phases at the harmonic specified in the Harmonic Number setup register.

V1 Angle, V2 Angle and V3 Angle

These numeric registers hold the voltage angle values (in degrees) for each phase at the harmonic selected in the Harmonic Number setup register. Voltage angles are given with respect to the position of the V1 fundamental harmonic.

I1 Angle, I2 Angle and I3 Angle

These numeric registers hold the current angle values (in degrees) for each phase at the harmonic selected in the Harmonic Number setup register. Current angles are given with respect to the position of the V1 fundamental harmonic.

Phase Angle1, Phase Angle 2 and Phase Angle 3

These numeric registers hold the phase angle value, in degrees, for each phase at the selected harmonic. The phase angle is given as the difference between the current and voltage angles for each phase.

Event

All events produced by a Power Harmonics module are written into this register. Possible events and their associated priority numbers are shown in the table below.

Event priority group Priority Description
Setup Change 10 Input links, setup registers or labels have changed.

The Event output register stores the following information for each ION event: time stamp, event priority, event's cause, event's effect, and conditions associated with the event's cause and effect.

Responses to special conditions

The following table summarizes how the Power Harmonics module behaves under different conditions.

Condition Response of output registers
If the Enable input is off or N/A The output registers are N/A.
When the device is started or powered-up (either the first time, or after a shut-down). The output registers are N/A.

Detailed module operation

The Power Harmonics module receives the phase voltage and current values measured by the IED. From these values, kW, kVA, kVAR, voltage angles, current angles and phase angles are calculated for the harmonic specified in the Harmonic Number setup register. Using these values, you can determine the magnitude and direction of harmonic power flow at any harmonic from the first to the 63rd.

The basic procedure for analyzing harmonic power flow is as follows:

  1. Choose the harmonic you want to analyze by specifying its number in the Harmonic Number setup register.

  2. Use software or the device’s display to view the values in the module’s output registers.

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