Assessor Resource
UETTDRDS55A
Design power system transmission and sub-transmission substation earthing
Assessment tool
Version 1.0
Issue Date: April 2024
2)
This competency standard Unit is intended to augment formally acquired competencies. It is suitable for employment-based programs under an approved contract of training.
1)Scope:
1.1) Descriptor
This Competency Standard Unit covers the design of transmission and sub-transmission zone substation earthing. This may include earth resistivity tests coordination, design of the earth grid, electrodes, grid connections, equipment connections and remote earthing connections to conduct maximum earth fault currents without exceeding the maximum allowable earth potential rise. The design does include earthing engineering aspects and must conform to safety regulations and environmental standards and incorporate the principles of safe design. However, it excludes the certification of earthing design.
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