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Power Systems Technical Articles

Our experts continuously work on power systems problems, and we share solutions with Practical Reference Articles.

The main topics are earthing system modeling, power cable ratings, HV/LV electrical design, protective device coordination, and arc flash studies. We cover IEC and IEEE standards.

Sign up for my email newsletter and I will send you the latest technical articles as they are released – Jayson Patrick.

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Low Voltage Design
Earthing Design
High Voltage Cable Design
Arc Flash Studies
Software Comparisons
Electrical Software
Offshore wind turbine being constructed 2 1170x585 - Popular
2 mins read

Wind Farm Dynamic Cable Ratings

This article explains why dynamic ratings are important when dealing with long AC cables for wind farms. An example calculation of a dynamic rating which uses the measured load profile is given.
LV Power Cables on Drums small ELEK Software 1170x585 - Popular
1 min read

Accurate voltage drop calculations

Accurately calculating voltage drop results in lower voltage drops which leads to smaller cable sizes and saves money.
1646194947271 1 e1646714632396 1170x585 - Popular
3 mins read

Current Rating for Groups of Circuits Installed in Air

The calculation of current ratings for groups of (multiple) cable circuits require the quantification of the mutual heating component between the groups of circuits. This example is for multiple groups of circuits in air on the same cable ladder. This article will discuss the IEC 60287 approach.
Lightning mast on a building Close up 1170x585 - Popular
6 mins read

Modelling Lightning Effects with an Equivalent Frequency

The effects of lightning strikes on earthing or protection systems designed to IEC 62305 can be modelled using an equivalent single frequency from 25kHz up to 1MHz which gives similar results to a time-domain approach. This article provides the frequency and current values to be used for modelling lightning.
Cross-section of XLPE insulated high voltage power cable
4 mins read

Derating of 400 kV Buried Cables from Ventilated Trough

New 13 kV power circuits will be installed in an unfilled trough with ventilated covers. These new circuits will cross with existing buried 400 kV cables at approximately 90 degrees with a continuous current rating requirement of 1136 MVA (1640 A) per phase for all seasons.
A group of thick black cables secured with zip ties is arranged in front of a metal support structure. Some cables are marked with blue or red labels.
4 mins read

Current Rating of Ten Cables Touching in Air

The standard HV cable rating calculation methods do not cover all real-world situations. This article proposes a new method of finding the current rating for 10 cables touching in the air.
2 mins read

How to model earthing surrounded with bentonite

How to model the influence of an additional substances like bentonite surrounding the conductors of a buried earthing system on grid resistance, touch and step voltages.
ELEK Software Power cables in a trench 1 1170x585 - Popular
3 mins read

Effects of Controlled Backfills on Cable Current Ratings

The effects on the current rating of cables buried in soils with different thermal resistivities are examined with software using the finite element technique.
1653971060513 1170x585 - Popular
3 mins read

Soil Frequency Dependency During Lightning Strikes

The effects of lightning strikes on earthing or protection systems designed to IEC 62305 can be modelled using an equivalent single frequency from 25kHz up to 1MHz which gives similar results to a time-domain approach. This article provides the frequency and current values to be used for modelling lightning.
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