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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.

Photo of Jayson Patrick for Technical Articles page about electrical power systems Design

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Low Voltage Design
Earthing Design
High Voltage Cable Design
Arc Flash Studies
Software Comparisons
Electrical Software
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.
Flowchart showing a series of squares, some filled red, on a path moving upward toward a "Higher Priority" label with an arrow on the right side.
3 mins read

Practical Guide to Selective Protection Coordination

Learn how to set priorities and adjust protective devices for selective coordination to isolate faults and minimise outages in electrical systems.
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.
Offshore wind farm with several turbines above water and underwater cables visible, set against a calm sea and a partly cloudy sky.
4 mins read

Thermal Analysis for HVDC Submarine Cables: Meeting the 2 K Criterion

Learn about thermal analysis for HVDC submarine cables, focusing on the 2 K Criterion to minimize environmental impacts.
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.
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.
Comparison Of Safegrid with XGSLab and CDEGS - Popular
2 mins read

Comparison of SafeGrid with XGSLab and CDEGS Results

We have benchmarked our SafeGrid Earthing Software results for a 60 x 60 m grid against well-known software XGSLab™ and CDEGS™. We show that the results for grid resistance in multilayer soils up to 5 layers are virtually identical.
4 mins read

Use of Rods to Improve Grid Safety

To show how and when earthing rods can be used to improve the safety of earthing grids by reducing the grid resistance and potential rise (GPR) as well as surface, step and touch potentials.
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.
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