Merus™ Harmonic CalculatorUser Guide

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Harmonic Calculator is a tool to

estimate the state of power quality

in your electrical system

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Total harmonic current can be

estimated based on the loads of the

system or power quality

measurement results can be used

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Required amount of active

harmonic filtering and reactive

power compensation capacity is

calculated automatically to meet

selected grid code requirements

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

The results are shown on the web

page and a more specific report is

sent to given e-mail address

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Merus™ Harmonic Calculator

Harmonic Calculator can be found on Merus Power web page:

https://www.meruspower.fi/harmoniccalcCurrently three language options are available: English, Spanish and Russian. Change language by using selections on the top of the page

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

https://www.meruspower.fi/harmoniccalc

Personal information

Start by filling in your personal data

PDF report will be sent to email address given

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Electrical system

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Electrical system

System voltage and frequency are needed for product selection

Provide line-to-line voltage at the point where Active Harmonic Filter would be installed

Please contact sales@meruspower.fi for solutions at higher voltage levels

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

mailto:sales@meruspower.fi

Electrical system, supplied from a grid

Upstream short circuit fault level and transformer parameters are needed for voltage harmonics calculations

Short circuit fault level (SSC) can be calculated from fault current (ISC) and upstream voltage (U) using formula

SSC = √3 * U * ISC

If the exact value of the short circuit level is not known, the following values may be used

Stiff medium voltage grid: 400 – 1800 MVA

Weak medium voltage grid: 40 – 150 MVA

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

3W/4W connection

Systems where neutral wire exists can be selected as 4W systems

If system does not have the neutral wire, 3W connection should be selected

4W connection is needed only when neutral wire currents (harmonics 3rd, 9th, 15th …) need to be compensated

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Current reference

TDD (Total Demand Distortion) relates harmonic content to its reference value (nominal or full load, for example).

If current reference is left blank, base value is calculated automatically

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Compensation level

Calculated compensation is based on selected grid code standard

If for example IEEE-519 standard is selected, compensation capacity is calculated to meet the limits of this standard

Limits for individual harmonic component can be seen from the PDF report

By selecting “Custom”, freely chosen voltage THD and current TDD limits can be chosen

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Loads

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Reactive power compensation

Merus Active Harmonic Filters can dynamically compensate load reactive power while compensating harmonics

Select the limit for Displacement Power Factor (DPF, cosphi) or for remaining reactive power. Priority of compensation determines if excess capacity will be used for harmonics or reactive power

Please contact sales@meruspower.fi for hybrid solutions, where Active Harmonic Filter controls capacitor bank steps to achieve cost-efficient dynamic reactive power compensation

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

mailto:sales@meruspower.fi

Load harmonics, power quality measurement

When power quality measurement has been made and load current harmonics are known, calculation will be based on these values

1st harmonic is the fundamental current

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Load harmonics, example loads

When load current harmonics are not known, calculation can be based on example loads

Load current harmonics will be calculated based on typical harmonic spectrum of each load type

“Linear load” means loads that do not cause harmonics. For example direct-on-line motors are linear loads.

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Results

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Result page

Results are shown after pressing “Submit”- button. More detailed report will be sent to given email address

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

PDF report

PDF report includes

• Description of the selected standard

• Information on harmonics and effect of bad power quality

• Power quality analysis before and after compensation

• Proposed solution

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

Merus™ Harmonic CalculatorUser Guide

Contact:

Sales:

Tel +358 20 735 4320

sales@meruspower.fi

Visit us:

Pirkkalaistie 1

37100 Nokia, Finlandwww.meruspower.com

The information is this document and any copyright attached to it, is the sole property of Merus Power Dynamics Oy. Any unauthorized reproduction or other utilization in part, or as whole, without a written permission from Merus Power is strictly prohibited.

mailto:sales@meruspower.fi