GE G60 UR Series, Инструкция по эксплуатации

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GE Multilin G60 Generator Protection System 5-177
5 SETTINGS 5.6 GROUPED ELEMENTS
5
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 can also be used to supervise the function.
Figure 5–96: SPLIT PHASE PROTECTION LOGIC
830007A1.CDR
SPLIT PHASE BLOCK
SETTING
SPLIT PHASE SOURCE:
I_A
I_B
I_C
FLEXLOGIC OPERANDS
SPLIT PHASE PKP A
SPLIT PHASE OP A
AND
Off = 0
SETTING
SPLIT PHASE LOAD SOURCE:
I_1
START
SPLIT PHASE B PICKUP
SPLIT PHASE B OFFSET
SPLIT PHASE B SLOPE
SPLIT PHASE MIN LOAD
SPLIT PHASE MODE
SETTINGS
START
SPLIT PHASE C PICKUP
SPLIT PHASE C OFFSET
SPLIT PHASE C SLOPE
SPLIT PHASE MIN LOAD
SPLIT PHASE MODE
SETTINGS
t
0
SETTING
SPLIT PHASE DELAY
START
SPLIT PHASE A PICKUP
SPLIT PHASE A OFFSET
SPLIT PHASE A SLOPE
SPLIT PHASE MIN LOAD
SPLIT PHASE MODE
SETTINGS
t
0
SETTING
SPLIT PHASE DELAY
t
0
SETTING
SPLIT PHASE DELAY
OR
SPLIT PHASE DPO A
FLEXLOGIC OPERANDS
SPLIT PHASE PKP B
SPLIT PHASE OP B
SPLIT PHASE DPO B
FLEXLOGIC OPERANDS
SPLIT PHASE PKP C
SPLIT PHASE OP C
SPLIT PHASE DPO C
FLEXLOGIC OPERANDS
SPLIT PHASE OP
ACTUAL VALUES
SPLIT PHASE A CURRENT (PU)
SPLIT PHASE C CURRENT (PU)
SPLIT PHASE B CURRENT (PU)
LOAD CURRENT (PU)
SETTINGS
SPLIT PHASE FUNCTION
Enabled =1