4.5.2
Earth (Ground) Overcurrent Protection – Settings
WARNING!
In case of measured ground (earth) current:
Ensure that the actual overcurrent settings comply with the technical and thermal limits
of the device, the CTs and the application!
Check the technical data (╚═▷ “9.1 Technical Data – WIC1”) for the permitted value
ranges. When dening the ground overcurrent protection settings, note that both
theshold and (delay) time must be set in consideration of the technical current input
limits.
•
The thermal load capacity of the ground (earth) current inputs can be found here:
•
╚═▷ “9.1.5 Ground Current Measurement”.
Unless there are any additional/external protective means installed we have to
recommend that you activate at least one ground overcurrent protection stage
considering the WIC1 limits.
Ignoring the permitted limits results will damage the WIC1, making it non-functional, and
this can possibly result in serious damages of your equipment and even serious injury.
NOTICE!
The „nominal current“ (rated current) In is for all Earth (Ground) Overcurrent stages
dependent on whether the ground (earth) current is measured or calculated. This is
especially true of all settings parameters that are dened in units of In.
• Measured ground (earth) current, [Field Para / General Settings] »CT . IG Source« =•
“measured”:
In is the rated current of the ground (earth) CT, and the WIC1 currently supports 1 A
ground (earth) CTs.
•
Calculated ground (earth) current, [Field Para / General Settings] »CT . IG Source« =
•
“calculated”:
In is the rated current of the phase CTs, and this corresponds to the setting [Field
Para / CT] »CT . In,relative«. (See also ╚═▷ “11.1.3 Setting of the Rated CT current
In” and ╚═▷ “4.2 Field Parameters”.)
DIP/HEX switches: ╚═▷ “11.1.5 Earth (Ground) Overcurrent Protection – Settings via DIP
Switches (WIC1‑2) or via HEX Switches (WIC1‑3)”
150 WIC1 WIC1-1.0-EN-MAN
4 Protective Elements
4.5.2 Earth (Ground) Overcurrent Protection – Settings
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