GE UR Series Instruction Manual page 175
Line differential relay
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- Instruction manual (652 pages) ,
- Manual (433 pages) ,
- Release notes (33 pages)
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5 SETTINGS
The Phase Directional element would respond to the forward load current. In the case of a following
reverse fault, the element needs some time – in the order of 8 msec – to establish a blocking signal. Some
NOTE
protection elements such as instantaneous overcurrent may respond to reverse faults before the blocking
signal is established. Therefore, a coordination time of at least 10 msec must be added to all the instanta-
neous protection elements under the supervision of the Phase Directional element. If current reversal is of
a concern, a longer delay – in the order of 20 msec – may be needed.
SETTING
PHASE DIR 1
FUNCTION:
Disabled=0
Enabled=1
SETTING
AND
PHASE DIR 1
BLOCK:
Off=0
SETTING
PHASE DIR 1 SOURCE:
I
0.05 pu
IA
Seq=ABC
Seq=ACB
SETTING
VBC
VCB
PHASE DIR 1 POL V
THRESHOLD:
-Use V when V
SETTING
-Use V memory when
PHASE DIR 1 BLOCK OC
V < Min
WHEN V MEM EXP:
V
MINIMUM
No
Yes
PHASE B LOGIC SIMILAR TO PHASE A
PHASE C LOGIC SIMILAR TO PHASE A
GE Power Management
Min
VOLTAGE MEMORY
VALID FOR 1 SEC.
1sec
0
Figure 5–41: PHASE DIRECTIONAL SCHEME LOGIC
L90 Line Differential Relay
5.5 GROUPED ELEMENTS
SETTING
PHASE DIR 1 ECA:
AND
RUN
0
Vpol
1
I
AND
OR
5
FLEXLOGIC OPERANDS
PH DIR1 BLK A
PH DIR1 BLK B
PH DIR1 BLK C
827078A3.CDR
5-91
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