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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
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.
A person wearing an orange safety vest holds a cross-section of a high-voltage power cable, showing multiple concentric copper segments.
17 mins read

HVDC Cable Current Ratings: Thermal and Electrical Stress Constraints

Comprehensive analysis of field inversion, IEC 60287 Standards, finite element modelling, and case studies to optimise HVDC cable ampacity and insulation design.
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.
HV Cables Single Cores in the Ground 1170x585 - Popular
2 mins read

Neutral Conductor Sizing

The neutral conductor is required for each primary circuit, and there are rules in the Standards for its sizing.
Electrician installing power cable 1170x585 - Popular
2 mins read

Voltage drop limits for Low Voltage installations

Voltage Drop Limits per the Wiring Rules AS/NZS 3000 as well as rules of thumb to assist with electrical design. Includes AC and DC voltage drop or rise limits.
Cables in trench 1170x585 - Popular
8 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.
Flowchart showing a series of squares, some filled red, on a path moving upward toward a "Higher Priority" label with an arrow on the right side.
4 mins read

Practical Guide to Selective Protection Coordination

Learn how to set priorities and adjust protective devices for selective coordination to isolate faults and minimise outages in electrical systems.
Copper earthing grid conductors buried
4 mins read

Resistance of Earthing Rods and Rod Beds

Earthing rods improve earthing systems when driven into low resistivity soil layers. Due to the proximity effect the rule of thumb is earth rods should be separated by at least their driven length. Rods may be encased in concrete to lower their resistance. Equations are provided for hand calculations and these have been validated with numerical software.
Diagram showing electric field (E), gravitational field (G), weight (W), and electrostatic force (Fe) acting on a charged oil drop.
10 mins read

Modelling a Fall of Potential Earth Grid Impedance Test

Understand how software simulations enhance grid impedance tests, improving accuracy and efficiency in earthing system design and performance evaluation.
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