High Voltage Cable Design

July 6, 2022

8 mins read

Current Rating of Cables in Multiple Backfills Using the Finite Element Method

A new calculation method based on FEM and IEC 60287 for current rating of HV cables in soils with multiple different thermal resistivities is explained with an example calculation. Modelling the different soil thermal resistivity zones (multiple backfills) is important for obtaining accurate cable current ratings.

Earthing Design

August 22, 2017

2 mins read

How to model earthing surrounded with bentonite

How to model the influence of an additional substances like bentonite surrounding the conductors of a buried earthing system on grid resistance, touch and step voltages.

Low Voltage Design

February 13, 2020

1 min read

Accurate voltage drop calculations

Accurately calculating voltage drop results in lower voltage drops which leads to smaller cable sizes and saves money.

Earthing Design

November 10, 2021

4 mins read

Multilayer Soil Effects on Earthing Grid Resistance

This article shows the effects of soil resistivity and thickness of layers on grid resistance for earthing systems in multilayer soils. Increasing the resistivity of soil layers tends to increase the grid resistance, no matter which soil layer that is. Increasing the thickness of any soil layer with high resistivity also increases grid resistance and if the soil layer thickness is increased for a low resistivity layer then the grid resistance will decrease. Software modelling is performed and the results are compared and shown to match well with those from CDEGS software.

High Voltage Cable Design

May 23, 2022

5 mins read

Current Rating of Cables in Ventilated Tunnels

The methods for calculating the current rating of multiple cables installed in ventilated tunnels are explained with example calculations. Overall tunnel length and air velocity inside the tunnel have a significant impact on cable current ratings.

High Voltage Cable Design

December 21, 2020

3 mins read

Waveform Cables Current Ratings

Waveform cables are commonly used in the UK for low-voltage power networks. The term waveform refers to the way the neutral/earth wires are laid around the cores/bedding. Using this configuration enables the neutral/earth wires to be opened so a connection can be made to the conductors anywhere along its length.

High Voltage Cable Design

September 29, 2024

2 mins read

Cable Tray Material Selection for Offshore Facilities

Based on extensive field experience, this article recommends the best materials for cable trays for use in offshore facilities such as offshore wind, solar, and oil rigs.

Earthing Design

March 17, 2023

1 min read

What Happens During Substation Earth Grid Faults?

During an earth fault on a substation earth grid, the flow of current to the earth will produce voltage gradients. An earth grid that is properly designed will safely dissipate current into the ground.

Earthing Design

March 16, 2021

2 mins read

Comparison of SafeGrid with XGSLab and CDEGS Results

We have benchmarked our SafeGrid Earthing Software results for a 60 x 60 m grid against well-known software XGSLab™ and CDEGS™. We show that the results for grid resistance in multilayer soils up to 5 layers are virtually identical.

Power Systems Technical Articles

Choose the article category

Current Rating of Cables in Multiple Backfills Using the Finite Element Method

How to model earthing surrounded with bentonite

Accurate voltage drop calculations

Multilayer Soil Effects on Earthing Grid Resistance

Current Rating of Cables in Ventilated Tunnels

Waveform Cables Current Ratings

Cable Tray Material Selection for Offshore Facilities

What Happens During Substation Earth Grid Faults?

Comparison of SafeGrid with XGSLab and CDEGS Results

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