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Harmonic analysis

The number of electronic devices and other non-linear loads that are connected to the power system generate harmonics which affect the quality of the power to end customers. Capacitors, which are installed to improve the system voltage and reduce losses, can create resonance if their location is not optimal. These harmonic distortions, if un-mitigated, have a detrimental effect on power quality as they can cause equipment malfunction, overheating of equipment and increased power losses.

Eaton's CYME harmonic analysis module helps engineers evaluate the harmonic level of their electrical network and to assess different mitigation methods. It features a number of analyses such as frequency scan, voltage and current distortion calculations, capacitor rating and filter sizing analysis, and k-factor and factor-k calculations. The module allows the user to model non-linear loads and other sources of harmonic currents such as converters and arc furnaces and to easily detect resonant frequencies due to capacitor banks. With its many modeling and analytical capabilities, the module makes it possible to accurately evaluate the impact of non-linear loads on the electrical network.

Harmonic analysis

General

The harmonic analysis module features both single-phase and full three-phase modeling capabilities, with the flexibility to make the program easily adaptable to utility-type grids, industrial power systems and distribution feeders of any configuration. It utilizes state-of-the-art sparse matrix/vector methods with a three-phase nodal admittance network matrix representation. The module uses Eaton's CYME robust load flow algorithm to obtain the fundamental frequency current and voltage system profile for harmonic distortion calculations and waveform display.

Impedance scan

The frequency scan capability included in this module is also available as an independent module. This analysis provides full impedance scan results and allows the user to see problematic areas even before installing harmonic devices.

Analytical capabilities

Phase or sequence analysis
Driving point and transfer point frequency scan analysis
Harmonic voltage distortion analysis
Harmonic current distortion analysis
Calculation of telephonic interference indices (TIF, IT, etc.)
Evaluate system sensitivity level
Harmonic cancellation
System detuning via filter sizing
Capacitor stress analysis
Skin effect modeling
User defined distortion limits or as per IEEE 519™ 1992 standard
Selection of line/cable models: series R-L, nominal Pl, transposed and un-transposed distributed parameters, and frequency-dependent
Selection of load models: (Parallel R-L, Series R-L, CIGRE C-Type, etc.)

Capacitor stress and filter sizing

The harmonic analysis module features stress analysis of capacitors, including those incorporated in filters, to help engineers determine whether the capacitors are rated properly according to user-defined or IEEE standard limits.

Likewise, fundamental resistor losses, fundamental and harmonic current through the reactance, and fundamental and harmonic voltage through the capacitor of filters are calculated to help engineers determine if the filters are sized properly.

Transformer k-factor calculation

The harmonic analysis module also offers the Transformer k-factor (ANSI/IEC) and factor-k (BS) calculation for the assessment of transformer rating with respect to the harmonic level of the system.

Library equipment

Users can model multiple types of harmonic sources to assess the effectiveness of filters and modify them at will in order to attain acceptable level of harmonic distortion indices on your network.

Our extensive library includes equipment such as:

Ideal and non-ideal converters
Generic single or multiple frequency current and voltage source models. This includes a library of drives with typical harmonic spectrum as per IEEE 519.18
Arc furnace model
Passive shunt filter models comprising single tuned, high-pass, double tuned and C-type
Library of single-phase and three-phase transmission line and cable models, series R-L, nominal Pl and distributed parameters
Synchronous and induction motor models
Single-phase and three-phase transformer models allowing harmonic cancellation through their phase shift angles
Modeling harmonic sources of nonlinear loads and power electronics equipment
Static load modeling: parallel R-L and CIGRE C-Type
Series and parallel RLC branch circuits to create any user defined equipment

Eaton’s CYME harmonic analysis module helps engineers evaluate the harmonic level of their electrical network and assess different mitigation methods.

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CYME users portal: my.cyme.com

Eaton is an intelligent power management company dedicated to improving the quality of life and protecting the environment for people everywhere. We are guided by our commitment to do business right, to operate sustainably and to help our customers manage power ─ today and well into the future. By capitalizing on the global growth trends of electrification and digitalization, we’re accelerating the planet’s transition to renewable energy and helping to solve the world’s most urgent power management challenges.

Harmonic analysis

Harmonic analysis

Analytical capabilities

Capacitor stress and filter sizing

Transformer k-factor calculation

Library equipment

CYME harmonic analysis

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