GE G60 Instruction Manual page 203

5 SETTINGS
per-unit split phase current over the per-unit load current. The user should assign the split phase current and the load
current (positive sequence) to the data logger to identify the optimum value for this setting.
• SPLIT PHASE MIN LOAD: This setting specifies the minimum load (positive-sequence current) supervision level.
• SPLIT PHASE MODE: This setting specifies the mode of operation. If the "Over" mode is chosen, the element will
pickup when the split phase current is rises above the biased offset current plus the pickup setting. If "Over-under"
mode is chosen, the element will also pickup if the split phase current is falls below the biased offset current minus the
pickup setting. See the earlier description for further details.
• SPLIT PHASE DELAY: This setting specifies a time delay required to operate after the pickup condition is established.
During an external disturbance the CTs may saturate. CT saturation can cause a spurious split phase current, espe-
cially in the case where the split phase current is derived from the external summation of two split phase CTs (first fig-
ure above). In this instance, a time delay can be used to ride through the saturation event. Alternately, the CT
saturation flag (see the Stator Differential section for details) can also be used to supervise the function.
SETTINGS
SPLIT PHASE FUNCTION
Enabled =1
SPLIT PHASE BLOCK
Off = 0
SETTING
SPLIT PHASE LOAD SOURCE:
I_1
SETTING
SPLIT PHASE SOURCE:
I_A
I_B
I_C
GE Multilin
SETTINGS
SPLIT PHASE A PICKUP
SPLIT PHASE A OFFSET
SPLIT PHASE A SLOPE
SPLIT PHASE MIN LOAD
SPLIT PHASE MODE
AND
START
SETTINGS
SPLIT PHASE B PICKUP
SPLIT PHASE B OFFSET
SPLIT PHASE B SLOPE
SPLIT PHASE MIN LOAD
SPLIT PHASE MODE
START
SETTINGS
SPLIT PHASE C PICKUP
SPLIT PHASE C OFFSET
SPLIT PHASE C SLOPE
SPLIT PHASE MIN LOAD
SPLIT PHASE MODE
START
ACTUAL VALUES
SPLIT PHASE A CURRENT (PU)
SPLIT PHASE B CURRENT (PU)
SPLIT PHASE C CURRENT (PU)
LOAD CURRENT (PU)
Figure 5–75: SPLIT PHASE PROTECTION LOGIC
G60 Generator Management Relay
5.5 GROUPED ELEMENTS
SETTING
SPLIT PHASE DELAY
t
0
SETTING
SPLIT PHASE DELAY
t
0
OR
SETTING
SPLIT PHASE DELAY
t
0
FLEXLOGIC OPERANDS
SPLIT PHASE PKP A
SPLIT PHASE DPO A
SPLIT PHASE OP A
5
FLEXLOGIC OPERANDS
SPLIT PHASE PKP B
SPLIT PHASE DPO B
SPLIT PHASE OP B
FLEXLOGIC OPERANDS
SPLIT PHASE OP
FLEXLOGIC OPERANDS
SPLIT PHASE PKP C
SPLIT PHASE DPO C
SPLIT PHASE OP C
830007A1.CDR
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