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We have a Siemens DCS system SPPA-T 3000 in power plant of 700 mw. In DCS panel grounding connection done separately for signal earth and power earth. Both are connected in daisy chain in the panel and carried to the earthing pit separately.
It is found that resistance measured in the panel vary greatly from 24 ohm to 150 ohm in different panels.
Why is it so? How much resistance between them is considered safe for operation?
It is found that resistance measured in the panel vary greatly from 24 ohm to 150 ohm in different panels.
Why is it so? How much resistance between them is considered safe for operation?