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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
Illustration of two electrical cables: one with a single copper conductor and the other with multiple layers including insulation, shielding, and a copper conductor.
10 mins read

Ampacity Calculations for Southwire Power Cables

We performed ampacity calculations for hundreds of industrial and utility power cables from Southwire. The assumptions used for modelling in the software are explained. The calculated ampacities were all within 3 % of the values given in ICEA and NEC standards.
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.
Power Cables lineup 1170x585 - Articles - High Voltage Cable Design
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.
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.
High voltage power cable with copper conductors
8 mins read

Achieving Accurate High Voltage Cable Current Ratings

Accurate high voltage cable current ratings achieved - ELEK Cable HV software matches CIGRE TB 880 and performs IEC 60287 compliant calculations.
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.
Figure 06 Cross bonded cables with transposition ELEK Software 1170x585 - Articles - High Voltage Cable Design
11 mins read

Sheath Bonding Design Guide for High Voltage Cables

Sheath bonding is one of the most important design aspects for high-voltage cable power transmission. Solidly, single-point, and cross-bonded systems are explained.
Fig. 3 – Crossing of 2 single core circuits 1 1170x585 - Articles - High Voltage Cable Design
7 mins read

Derating for Cable Crossings

Crossing multiple cables or heat sources at a crossing angle causes a current rating reduction, calculated using IEC Standard 60287.
Cross-section of XLPE insulated high voltage power cable
4 mins read

Derating of 400 kV Buried Cables from Ventilated Trough

New 13 kV power circuits will be installed in an unfilled trough with ventilated covers. These new circuits will cross with existing buried 400 kV cables at approximately 90 degrees with a continuous current rating requirement of 1136 MVA (1640 A) per phase for all seasons.
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