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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
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Electrical Software
Close-up of an electrical panel displaying several circuit breakers, labeled with yellow tags such as QF1, QF2, and QF6, and connected by various colored wires.
3 mins read

The Ultimate MCB Protective Device Selection Guide

Miniature Circuit Breakers (MCBs) protect against overcurrent in electrical circuits. MCBs are categorised based on their tripping characteristics, represented by different device curves such as Z, B, C, K, and D. This article offers guidance on selecting the right type for your application.
1657081375283 1107x585 - Popular
8 mins read

Current Rating of Cables in Multiple Backfills Using the Finite Element Method

A new calculation method based on FEM and IEC 60287 for current rating of HV cables in soils with multiple different thermal resistivities is explained with an example calculation. Modelling the different soil thermal resistivity zones (multiple backfills) is important for obtaining accurate cable current ratings.
Electrical Wiring Being Installed for a New Commercial Building
6 mins read

Economic and Energy Efficient Cable Sizing

The principle of economic cable sizing is to select a minimum cable size that is safe to use and the cost of the losses over the lifetime is also minimised.
Offshore wind farm with several turbines above water and underwater cables visible, set against a calm sea and a partly cloudy sky.
7 mins read

Cable Current Rating in J-Tubes for Offshore Windfarms

This article explains how to calculate the current rating of cables in J-tubes. Typically J-tubes are the thermal bottleneck of submarine power cable routes.
SafeGrid Reach Touch Voltage Plot 1170x585 - Popular
4 mins read

Reach Touch Voltages Explained

Reach touch voltages are different to touch voltages and automatically set to zero when the distance between the voltage point on the ground surface and the grid conductor which is touched exceeds a reach distance.
Oil-filled cable with finite element mesh plot for current rating calculation
3 mins read

Current Rating of High Voltage Oil-filled Cables

Explains the fundamentals of oil-filled cables current rating calculations to IEC 60287 and provides and example calculation for a 400 kV single core cable.
Solar panels on a dirt field in arizona.
5 mins read

Grounding Conductor Selection for Utility-scale Solar Farms

Copper is often preferred for its superior electrical properties, while aluminum and galvanized steel are chosen for cost-effectiveness. Copper-clad steel can offer a balance between cost and performance. This article demonstrates which option is best for different scenarios.
A graph displays time-current curves with a blue and red shaded areas, showing time (s) on the y-axis and current (A) on the x-axis, both on logarithmic scales.
2 mins read

A Step-by-Step Protection Coordination Study Example

Learn how to set and coordinate circuit breakers to meet AS/NZS 3000:2018, ensuring faults are isolated quickly and safely in electrical systems.
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.
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