Basic Operation Of The Segregated Phase Comparison System - Ametek UPLC CU44-VER04 Applications Manual

UPLC™ Application Manual
Arming Input-Current Detector (CD)
Remote
Square Waves
from Channel
Local
Positive
Square
Negative
Waves
Figure 3–8. Basic Operation of the Segregated Phase Comparison System.
Square Wave
Square Wave
External Line Up
Note: Comparison at Both Terminals sees Fault as External.
Figure 3–9. Conventional Phase Comparison Response to an Outfeed Condition Block Tripping.
Typical Settings
Trip Positive
Trip Negative
Local Positive
Local Negative
Keying Square Wave
Figure 3–10. Typical Threshold Setting for Offset Keying.
Page 3–12
Channel Security Checks
AND
P
OR
AND
N
Outfeed for an Internal Fault (See Text)
I Fault
G
I
F
Local
Remote
+3A
-2A
-4A
1
0
1
0
X
Comparison
AND
0
Note:
X = 3 Milliseconds for the Phase Subsystems
4 Milliseconds for Ground
I
H
Keying
Square
Wave
Trip Positive
Trip Negative
Zero Axis
(1)
Local Positive
(0)
(0)
Local Negative
(1)
Trip
I
Key