GE Multilin G650 Manual page 205

5.4 PROTECTION ELEMENTS
Table 5–63: GENERATOR UNBALANCE ELEMENT SETTINGS
SETPOINT > PROTECTION ELEMENTS > NEGATIVE SEQUENCE CURRENT > GENERATOR UNBALANCE >
GENERATOR UNBALANCE 1> GENERATOR UNBALANCE 2 > GENERATOR UNBALANCE 3
SETTING DESCRIPTION
Function Permision
Generator Rated Full Load Current
Pickup level for stage 1 (as a percentage of
Gen Unbal Inom)
K (Negative sequence capability constant) for
stage 1
Minimum Operating time for stage 1
Maximum Operating time for stage 1
K for Linear reset of the stage
Pickup level for stage 2 (as a percentage of
Gen Unbal Inom)
Trip time for stage 2
Snapshot Event generation
• Gen Unbal Function: This setting allows enabling or disabling the element.
• Gen Unbal Inom: This setting is the rated full load current of the machine.
• Gen Unbal Stg1 Pkp: This setting defines the pickup of the stage 1 element expressed as a percentage of the
nominal current as specified by GEN UNBAL INOM setting. It is typically set at the maximum continuous negative
sequence current rating of the machine.
5
• Gen Unbal Stg1 K: This setting is the negative sequence capability constant. This value is normally provided by the
generator manufacturer.
• Gen Unbal Stg1 Tmin: This is the minimum operate time of the element.
• Gen Unbal Stg1 Tmax: This is the maximum operate time of the element. This setting can be applied to limit the
maximum tripping time.
• Gen Unbal Stg1 K-Rst: This setting defines the linear reset rate of the stage. This feature provides a thermal memory
of previous unbalance conditions.
• Gen Unbal Stg2 Pkp: This setting defines the pickup of the stage 2 element expressed as a percentage of the
nominal current as specified by GEN UNBAL INOM setting.
• Gen Unbal Stg2 Delay: This is the minimum operate time of the stage 2 element.
Table 5–64: GENERATOR UNBALANCE INTERNAL SIGNALS
5-62
NAME
Function
Gen Unbal Inom
Gen Unbal Stg1 Pkp
Gen Unbal Stg1 K
Gen Unbal Stg1 Tmin
Gen Unbal Stg1 Tmax
Gen Unbal Stg1 K-Rst
Gen Unbal Stg2 Pkp
Gen Unbal Stg2 Delay
Snapshot Events
SIGNAL
GEN UNBAL (1, 2, 3) BLOCK
GEN UNBAL (1, 2, 3) STG1 PKP Output used to indicate I2/Inom ratio above stage 1 setting
GEN UNBAL (1, 2, 3) STG1 OP
GEN UNBAL (1, 2, 3) STG2 PKP Output used to indicate I2/Inom ratio above stage 2 setting
GEN UNBAL (1, 2, 3) STG2 OP
GEN UNBAL1 PKP
GEN UNBAL1 OP
G650 Generator Protection & Control System
DEFAULT VALUE
DISABLED
5.00
8.00
1.00
0.3
600.0
240.0
3.00
5.0
ENABLED
COMMENT
Input used to block the element (1, 2, 3) externally
in units (1, 2, 3)
Output used to indicate stage 1 operation in units (1, 2, 3)
in units (1, 2, 3)
Output used to indicate stage 2 operation in units (1, 2, 3)
This status is a logic OR between the GEN UNBAL(1, 2, 3)
STG1 PKP and GEN UNBAL(1, 2, 3) STG2 PKP
This status is a logic OR between the GEN UNBAL(1, 2, 3)
STG1 OP and GEN UNBAL(1, 2, 3) STG2 OP
5 SETTINGS
STEP RANGE
N/A [DISABLED – ENABLED]
0.01 A [0.00 : 10.00]
0.01 % [0.00 : 100.00]
0.01 [0.00 : 100.00]
0.1 s [0.0 : 1000.0]
0.1 s [0.0 : 1000.0]
0.1 [0.0 : 1000.0]
0.01 % [0.00 : 100.00]
0.1s [0.0 : 1000.0]
N/A [DISABLED – ENABLED]
GEK-113285A