HV Three Position Switches

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EmpireWind

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Virginia
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Electrical Engineer
Anyone have experience with three position switches at HV and EHV level? How are safety rules written to provide isolation and grounding?
Is it preferable to have a separate disconnect switch and a separate grounding/earth switch?
 
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Hv&Lv

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You’ll have to be a little more descriptive about what your asking.
three position switches for a substation doesn’t ring a bell with me.
Got a picture?
 
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EmpireWind

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Location
Virginia
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Electrical Engineer
It is a part of a specification I am reviewing for a GIS. The vendor is proposing a 3-position switch, which combines a disconnect with grounding switch.
I looked at IEEE C37.122 standard and C37.122.1 guide and both are silent on that. I have not seen it used in the US in switchyards.
The standard guide shows a one line with separate ground and separate disconnect but the standard does not explicitly spell that out.
The vendor is contending that the three way switch gives the same functionality.
 
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