GE G30 - Page 346

5-206 G30 Generator Protection System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
5
The LOSS OF EXCIT BLK setting specifies a FlexLogic operand for blocking the feature based on user-programmable condi-
tions. When the blocking input is asserted, the element resets its timers, de-asserts the PKP and OP operands (if asserted),
clears self-reset targets, logs a ‘blocked’ event if events are enabled, and becomes inactive. When unblocked, the element
will start functioning instantly. If exposed to pickup conditions for an extended period of time and unblocked, the element will
pickup and start timing out at the moment of unblocking.
If the VTs are located on the HV side of the transformer, then the source should be configured using CTs that are
also on the HV side. Correspondingly, if the VTs are located on the LV side of the transformer, then the source
should be configured using CTs that are also on the LV side. In both cases, the CT polarity should produce a posi-
tive power measurement when the machine is generating.
The element responds to the positive sequence impedance as shown below.
Figure 5–92: LOSS OF EXCITATION SCHEME LOGIC
NOTE
LOSS OF EXCITATION
FUNCTION:
LOSS EXCIT BLK:
SETTING
SETTING
Generator=1, Motor=1
Disabled=0
SETTING
Enabled=0
Disabled=1
LOSS OF EXCITATION
SOURCE:
SETTING
I_1
V_1
Off=0
830001AB.CDR
LOSS OF EXCITATION
CENTER 1:
LOSS OF EXCITATION
FUNCTION:
LOSS OF EXCITATION
CENTER 2:
LOSS OF EXCITATION
PKP DELAY 1:
LOSS OF EXCITATION
PKP DELAY 2:
LOSS OF EXCITATION
RADIUS 1:
LOSS OF EXCITATION
RADIUS 2:
RUN
RUN
OR
OR
SETTINGS
SETTING
SETTING
FLEXLOGIC OPERANDS
FLEXLOGIC OPERANDS
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
LOSS EXCIT STG1 PKP
LOSS EXCIT STG2 PKP
LOSS EXCIT STG1 DPO
LOSS EXCIT STG2 DPO
LOSS EXCIT STG1 OP
LOSS EXCIT STG2 OP
LOSS EXCIT OP
LOSS EXCIT PKP
LOSS EXCIT DPO
0 ms20 ms
0 ms
0 ms
20 ms 0 ms
I_1 > 0.05 pu
BLOCK (See description)
RUN
COMPARATOR
RUN
SETTING
LOSS OF EXCITATION UV
SUPV 2 :
SETTING
Enabled=0
Disabled=1
LOSS OF EXCITATION
UV SUPV :
LOSS OF EXCITATION UV
SUPV 1 :
OR
OR
AND
|V_1| < PICKUP
AND