Effective dc current relay for High-Risk Applications
Reliable dc current relay Designs for Industrial and Industrial Applications
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awaled37 asked what is the difference between positive grounding and floating grounding the 48 v DC system?
in the substation we use DC voltage 48 v to operate the communication equipment (PLC & RTU &PAX &SDH ) and the positive is connected to ground (Positive grounding) but we use 110 v DC to operate protection equipment (E/F &over current&Distance relay ) and the ground is at the middle (floatng groundhng) What advantages and disadvantages of each
And got the following answer:
In any a/c or d/c system operating at any voltage, a floating ground, whether the "ground" be positive or negative, is one that depends solely on the wiring for the return/ground leg. A system that uses chassis, frame or other parts for all or part of the return leg is generally referred to as a chassis ground. In either a "floating ground" or "chassis ground" system that uses the positive or hot leg as "ground" then that system must also "float" above "earth ground". In a system with a negative or common leg as "ground" then that system may either be grounded to "earth ground" or it may be configured as a "floating" ground. Basically there are equally valid arguments to support either system. In my experience it is more the whim of the design engineer than the result of an advantage/disadvantage argument.
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