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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.

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Low Voltage Design
Earthing Design
High Voltage Cable Design
Arc Flash Studies
Software Comparisons
Electrical Software
A diagram of a set of test tubes on a table with power.
3 mins read

Concrete-encased Earthing Rods

Metal earthing rods that are encased inside concrete will have a lower resistance. Concrete has a typical electrical resistivity of between 30 Ohm.m to 200 Ohm.m.
A software interface screen displaying a pop-up for creating a new electrical calculation. Various calculation options such as "Voltage Drop" and "Maximum Demand" are listed.
7 mins read

Top 3 Electrical Engineering Design Software for Australia

We've reviewed the top 3 electrical engineering design software packages in 2024 that are designed for Australian conditions and electrical standards. We've compared the features, capabilities, pricing, and technical support.
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.
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.
Earthing Design Software Screenshot
6 mins read

Extensive Study of Earthing Grids

An extensive study of earthing grids using SafeGrid software designed for determining performance of grids of arbitrary geometrical configuration in two layer soils has been undertaken. The study confirms work by Dawalibi and Mukhedkar undertaken using similar software called CDEGS®.
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.
Substation fence 1 1170x585 - Popular
3 mins read

Touch Voltages on Substation Metallic Fences

Should a metal fence be bonded to the substation earth grid? The metal fences around substations keep people out but they pose earthing safety challenges. These metallic fences, which are easily accessible to the public and personnel, must be adequately earthed and touch voltages on them during an electrical fault must not exceed safe limits.
Cross-section of a cable duct in soil showing airflow patterns: warm air rises in the center, cool air descends by the wall, and heat is conducted into the soil.
9 mins read

Ampacity of Multiple Cable Circuits in a Duct

Accurate ampacity for multiple cable circuits in a duct using FEM: Learn how mutual heating and duct arrangement impact safe, efficient cable design in solar PV systems.
1639370701193 1099x585 - Popular
3 mins read

Lightning Strikes to Buildings with Earthing Systems

This report shows the effects of a direct lightning strike to an air terminal installed on top of a building which is connected to a buried earthing system.
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