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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.
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.
shutterstock 188769602 1170x585 - Popular
12 mins read

Fundamentals of Earthing Design

Key earthing design concepts covered including Grid Potential Rise, design to reduce touch and step voltages, fault current distribution, effects of soil resistivity and use of rods to improve safety along with calculation and modelling 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.
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.
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.
Graph comparing the relationship between distance and resistance in electrical systems and renewable energy sources.
9 mins read

Testing of Earthing Systems

Provides test procedures based on the fall of potential method and actual touch and step voltage measurements for the purpose of validating a safe earthing design. Includes procedures for both large or small earthing systems, safety requirements (for undertaking the tests) and recommended testing equipment.
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.
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