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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
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.
A table with an assortment of cables and wires for power connections.
5 mins read

Charging Current and its Affect on Maximum Cable Length

Charging current in power cables is 10-20 times larger than for overhead lines. The maximum length of cable circuits is determined by their capacitance. This report provides equations and shows how critical cable length depends on voltage level, cable size and frequency.
Lightning strike on substation 1 1 1170x585 - Popular
6 mins read

Lightning Protection Design for Substations

Direct lightning strikes to substations causes physical damage and poses hazards for people.
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.
Close-up of orange industrial cables coiled together, with one frayed open end visible in the foreground.
10 mins read

AS/NZS 3008 Cable Sizing Calculations: Step-by-Step Guide

Size active, neutral, and earth cables using AS/NZS 3008. The guide covers current capacity, voltage drop, and short-circuit calculations with examples.
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.
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.
Cables in trench 1170x585 - Popular
10 mins read

Estimating Cable Life Expectancy

Most power cables have a design life of between 20 to 30 years. If the cables are not fully loaded, they are expected to last beyond their design life. The insulation is the weakest part of a cable. Montsinger's Rule states: Insulation life is halved by a temperature increase of 8 to 10 ˚C. An example calculation using the Arrhenius equation is provided.
Motors in a factory setting_ELEK Software
2 mins read

Maximum Demand Tables

Reference tables for diversity factors and energy demand from Wiring Rules AS/NZ 3000 for domestic and non-domestic installations.
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