GE G60 Instruction Manual page 199

5 SETTINGS
• GEN UNBAL STG1 K-RESET: This setting defines the linear reset rate of the stage 1 element. It is the maximum reset
time from the threshold of tripping. This feature provides a thermal memory of previous unbalance conditions.
• GEN UNBAL STG2 PICKUP: This setting defines the pickup of the stage 2 element expressed as a percentage of the
nominal current as specified by
an alarm to prompt an operator to take some corrective action. The stage 2 element would typically be set at a safe
margin below the stage 1 pickup setting.
• GEN UNBAL STG2 PKP DELAY: This is the minimum operate time of the stage 2 element. This is set to prevent nui-
sance alarms during system faults.
1000
Tmax
100
10
1
0.1
0.01
Figure 5–70: GENERATOR UNBALANCE INVERSE TIME CURVES
SETTING
GEN UNBAL
FUNCTION:
Disabled=0
Enabled=1
AND
SETTING
GEN UNBAL
BLOCK:
Off=0
SETTING
AND
GEN UNBAL
SOURCE:
I_2
GE Multilin
setting. The definite time element would normally be used to generate
GEN UNBAL INOM
K=1 K=4 K=15 K=40 K=100
0.1
SETTINGS
GEN UNBAL
INOM:
GEN UNBAL
STG1 PICKUP:
GEN UNBAL
STG1 TMIN:
GEN UNBAL
STG1 TMAX:
GEN UNBAL
STG1 K-VALUE:
GEN UNBAL
STG1 K-RESET:
RUN
t
SETTINGS
GEN UNBAL STG2
PICKUP:
SETTING
GEN UNBAL STG2
GEN UNBAL INOM:
PKP DELAY:
RUN
T
PKP
I_2 > PICKUP x INOM
100
Figure 5–71: GENERATOR UNBALANCE SCHEME LOGIC
G60 Generator Management Relay
1 10
I_2
OR
0
OR
5.5 GROUPED ELEMENTS
Tmin
100
830714A1.CDR
FLEXLOGIC OPERANDS
GEN UNBAL STG1 OP
GEN UNBAL STG1 PKP
GEN UNBAL STG1 DPO
GEN UNBAL STG2 OP
GEN UNBAL STG2 PKP
GEN UNBAL STG2 DPO
GEN UNBAL PKP
FLEXLOGIC OPERAND
GEN UNBAL OP
FLEXLOGIC OPERAND
OR GEN UNBAL DPO
5-117
5