Essential Knowledge and Associated Skills EKAS This describes the essential skills and knowledge and their level required for this unit Evidence shall show that knowledge has been acquired of designing transmission subtransmission and zone substation earthing All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies KSTDSA Power system transmission and subtransmission substation earthing KS01-TDS55A Power system transmission and sub-transmission substation earthing Evidence shall show an understanding of designing power system transmission and subtransmission earthing to an extent indicated by the following aspects T Distribution earthing system encompassing Standards codes legislation supply authority regulations and or enterprise requirements applicable to the distribution earthing system Reason and types of distribution earthing systems Terminologies used in the earth systems including touch and step potential Conditions associated when an active HV conductor fails to earth Selection of earthing electrodes and grids Determination of the earthing resistance of copper clad rods using earthing monograms T Principles of transmission subtransmission and zone substation earthing designs encompassing Commonwealth StateTerritory and local government legislation Standards codes supply authority regulations and or enterprise requirements applicable to the substation design management principles Requirements for the use of the substation system construction manuals system diagramsplans and drawings and for plans such as work method statements for the control of OHS risks Types of activities to be carried out earth resistivity tests coordination design of the earth grid confirmation of control of transfer of EPR Types of earthing design parameters coordination and analysis of earth resistivity tests design and drafting of earth grid including electrodes grid connections equipment connections and remote earthing connections to conduct maximum earth fault currents without exceeding the maximum allowable earth potential rise EPR confirmation of acceptable step and touch potentials including attenuation or hazard control measures water telephone service and LV neutral supplies isolation to isolate local EPR |