Enhanced AC and DC safety voltage limits assessment

Currently, we do not specify what the ground surface needs to be when construction of a new substation is being undertaken. This work would give us an appropriate basis to be able to publish a policy document that could state what materials are and aren’t appropriate for use in substations where HVDC systems are in use. It would give us a good understanding of the types of problems we are looking for when specifying ground surfaces, and also allow the tool to be used in exercises when deciding what surface to use. Because surfaces would have a standard set of measurements associated to them, which judging would be based on, it would be fairly simple to incorporate new materials into the tool for consideration when they arise. We would simply test the new material electrically, and then input the parameters into the software.

Benefits

The project will be successful if, at the end of the project, we have the tool for quantifying the electrical resistance of the ground surface, a dataset of common materials, and a recommendation for changes that are needed to the National Grid policy document.

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Enhanced AC and DC safety voltage limits assessment

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