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UPLC™ Application Manual
AND
P
AND
N
OR
Comparison
AND
Arming Input-Current Detector (CD)
Channel Security Checks
Remote
Square Waves
from Channel
Local
Square
Waves
Positive
Negative
Trip
Note:
X = 3 Milliseconds for the Phase Subsystems
4 Milliseconds for Ground
X
0
Figure 3–8. Basic Operation of the Segregated Phase Comparison System.
I
F
I
G
I
H
Outfeed for an Internal Fault (See Text)
Fault
Local
Square Wave
Remote
Square Wave
External Line Up
Note: Comparison at Both Terminals sees Fault as External.
Keying
Square
Wave
Figure 3–9. Conventional Phase Comparison Response to an Outfeed Condition Block Tripping.
Typical Settings
+3A
-2A
-4A
Trip Positive
Trip Positive
Trip Negative
Trip Negative
Local Positive
Local Positive
Local Negative
Local Negative
1
0
1
0
Keying Square Wave
Zero Axis
I
Key
(1)
(0)
(0)
(1)
Figure 3–10. Typical Threshold Setting for Offset Keying.
Содержание UPLC CU44-VER04
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