GE G60

5-254 G60 Generator Protection System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
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 5–136: FIELD CURRENT FAULT DETECTOR FUNCTION LOGIC
SETTINGS
= Enabled
Function
= Off
Block
AND
SETTING
Field OC Pickup
RUN
I Pickup
FLD
≥
SETTING
Field UC Pickup
RUN
I Pickup
FLD
≤
SETTING
Field OC Delay
T
PKP
0
SETTING
Field UC Delay
T
PKP
0
FLEXLOGIC OPERANDS
FIELD OC OP
FIELD OC PKP
FIELD OC DPO
FLEXLOGIC OPERANDS
FIELD UC OP
FIELD UC PKP
FIELD UC DPO
ACTUAL VALUE
Field Current
830011A2.CDR
SETTINGS
= <Value>
Field Current Origin