Subject Of Previous
Articles

Article

Glossary of
Sizing Power and Distribution Transformers,


Resources
used to calculate basic ratings of power and distribution transformers


the selection
factors for the Power and Distribution Transformers


Applicable
calculations procedures for sizing of power and distribution transformers


1Applicable
procedures for calculating power and distribution transformer ratios,
2Applicable
procedures for calculating power transformer efficiency,
3Applicable
procedures for calculating power transformer voltage regulation,
4Special Cases
In Transformers Sizing Calculations: Secondary Unit Substations


Special Cases
In Transformers Sizing Calculations: Paralleled Transformers


Special Cases
In Transformers Sizing Calculations: KFactor Transformers


Note: I’d like
from all of you to review our course “EP3: Electrical Procurement – Transformers Course” to be more
familiar with the contents of our new articles about the Power and
Distribution Transformers sizing calculations.


Today, we
will explain other special cases for Power and Distribution Transformers
sizing calculations; KFactor/Factor K Calculator and Spreadsheet.

Special
Cases In Transformers Sizing Calculations
KFactor/Factor
K Calculators

Here we will
study the programs and excel spreadsheets used for calculation of KFactor/Factor
K used in sizing transformers with nonlinear loads, these programs and
excel spreadsheets are:

1 KFactor / Factor K Calculator
Note:
This program is designed to assist in the
calculation of K Factors. It should be used for reference purposes only and
users should verify that the results are valid for their particular
circumstances.

Introduction
This software calculates the KFactor of a load from
the harmonic content according to US and European practice. The results can
be used to select transformers or to determine suitable derating factors for
transformers.

How to use?
We will
explain the following points to show how this program can be used in the
calculation of KFactor / Factor K:

First: Installation
C:\Program Files (x86)\Copper Development
Association\KFactor Calculator\

Second: Running The Program

Third: The Main Window
The main window of the program have two drop down
menus as follows:
A File drop down menu:
Where you can select again between the following
options:
B Method drop down menu:
Again you can select, from this drop menu, between calculating KFactor according to the US standards or Factor K according to the European standards.

Forth: Making New Calculation
File
A Input data:
When selecting calculating KFactor according to the
US standards, the Magnitude of each harmonic order, shall be entered and this
can be done by two different methods:
As a summary to entry data steps:
B Output Data:
In case of KFactor calculations: the output data will be as
follows:
In case of Factor K calculations: the output data will be as
follows:

2
Transformer Calculations Spreadsheet
The Transformer
Calculations Spreadsheet consists of two parts:

First part:
Transformer Rating Calculator
Enter values in yellow cells only. Other
cells will be calculated.
Input data:
Output data:

Second
part: Transformer Harmonic Calculator
Enter values in yellow cells only. Other
cells will be calculated.
Input data:
Output data:
Notes:

To download
your copy of KFactor/Factor K Calculator, click on the link.
To download
your copy of Transformer Calculations Spreadsheet, click on the link.
Note:
Nonregistered members in
ElectricalKnowhow website will not be able to open and use the program and
excel spreadsheet.
To register as
a member of ElectricalKnowhow website, do the following:

In the next article, we will continue
discussing the last special case for Power and Distribution Transformers sizing
calculations which will be Transformers with Large Motor Loads. So, please keep following.
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