GE Multilin g60

GE Multilin G60 Generator Protection System 5-217
5 SETTINGS 5.6 GROUPED ELEMENTS
5
In a HardFiber G60 device, this setting can point to one of the TRD inputs mapped to a Brick dcmA input. In both
cases, the minimum and maximum scaling settings of that transducer input are used to perform the per-unit conver-
sion. The unit setting shall be configured as “Amps” if the transducer input is used.
These minimum and maximum settings are set as per the Hall sensor current rating. The per-unit computation is
scaled to a base equal to the maximum value setting, with a zero per-unit value corresponding to zero in the unit sys-
tem used by the maximum value setting. For example, in the case where the maximum value setting is 100 A, a trip
level of 75 A is achieved by setting the operate level at 0.75 pu, regardless of the range (for example, 4 to 20 mA, 0 to
20 mA etc.) and regardless of the minimum value setting.
• FIELD OVER CURRENT PICKUP: This setting specifies the field current level above which the overcurrent element
picks up.
• FIELD OVER CURRENT DELAY: This setting specifies a time delay for the overcurrent element. This delay is added
to the operating time of the element to obtain the overall delay.
• FIELD UNDER CURRENT PICKUP: This setting specifies the field current level above which the undercurrent ele-
ment picks up.
• FIELD UNDER CURRENT DELAY: This setting specifies a time delay for undercurrent element. This delay is added to
the operating time of the element to obtain the overall delay.
• FIELD CURRENT BLK: This setting allows the user to select a FlexLogic™ operand to block the field ground function.
The field current fault detector function logic is shown below.
Figure 5–120: FIELD CURRENT FAULT DETECTOR FUNCTION LOGIC
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