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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
ELEK vs Competitors
Electrical Software
A group of different electrical power cables
7 mins read

Skin and Proximity Effects on AC Resistance Calculations

The AC resistance of a cable conductor is always larger than the DC resistance. The primary reasons are ‘skin effect’ and ‘proximity effect’. Equations and example calculations are provided in this article.
Cable Pulling on Rollers 1 1170x585 - Popular
5 mins read

Cable Pulling Tension Calculations

This article explains how to perform cable pulling tension and sidewall pressure calculations and also includes an example.
1654491769111 1 1170x585 - Popular
12 mins read

Solar PV systems – DC cable sizing with examples

DC cable sizing has significant implications on a PV system's performance, total cost, and safety. Example calculations of Current Rating and Voltage Rise have been provided.
Soil resistivity measurements using Wenner method 1 1170x585 - Popular
3 mins read

Typical Values of Soil Resistivity

Soil electrical resistivity varies based on several factors. Use these tables to validate your soil measurements or devise a soil model without having measurements for preliminary earthing/grounding designs.
ELEK Software Touch and Step Voltages to IEEE and IEC Standards 1170x585 - Popular
8 mins read

Safety Limit Calculations to IEEE and IEC Standards

A safe earthing system design has two objectives; to provide a means to carry normal and fault current without exceeding equipment limits or adversely affect continuity of service and to reduce the risk of a person in the vicinity of an earthed facility being exposed to the danger of a critical electric shock.
Short circuit cable rating ELEK Software 1 1170x585 - Popular
4 mins read

Short Circuit Power Cable Sizing Explained

The fault current which flows in a power cable causes its temperature to rise dramatically. The adiabatic equations for calculating the minimum conductor size to withstand the short circuit are explained.
Close-up view of three thick, black electrical cables with exposed copper wire cores arranged in a triangle formation.
9 mins read

Cable Sheath Induced Voltage Calculations

High voltage cable sheath induced voltages and currents theory is explained, with equations, bonding strategies and case study for a safe cable design.
Cable trench being backfilled by an excavator 1170x585 - Popular
5 mins read

Typical Thermal Resistivity of Backfill Soils and Concrete

It's difficult to decide on the thermal resistivity of soil or backfill to use for cable rating studies. The typical thermal resistivities of common native soils and engineered materials used as backfills for buried cables are provided in tables.
Power Cables lineup 1170x585 - Popular
17 mins read

High Voltage Power Cable Current Ratings

Explains the effects of the installation conditions and the bonding arrangement on the current rating of high voltage power cables.
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