GE L60 Instruction Manual page 504

Line phase comparison system, ur series
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9.1 OVERVIEW
The following figure illustrates the alignment algorithm. The figure shows local current, received RX voltage, and the remote
pulse aligned with the local pulses accounting for the channel delay setting.
F1-IA
F2-IB
F3-IC
87PC BKR1 CURRENT
POS ALIGNED
9
RX1P VOLTAGE
RX1P ALIGNED
Being communication-dependent, a phase comparison relay should treat information delivered from the remote terminals
with the same criticality as the local AC currents. This includes monitoring for troubleshooting purposes, accountability, and
continuous improvement capability for products and installations. Modern microprocessor-based phase comparison relays
9-30
CORRECTING EXTENDED MARKS - ASYMMETRY SETTING NEGATIVE
SENT
RECEIVED
ADJUSTED
CORRECTING EXTENDED SPACES - ASYMMETRY SETTING POSITIVE
SENT
RECEIVED
ADJUSTED
Figure 9–25: PULSE ASYMMETRY, PHENOMENON AND CORRECTION
(CHANNEL DELAY NOT SHOWN FOR SIMPLICITY)
3) Internal AG fault
= coincidence
Figure 9–26: ALIGNMENT LOGIC (RELAY COMTRADE RECORD)
L60 Line Phase Comparison System
dt
dt
TIME
dt
dt
TIME
4) Internal BG fault
= no coincidence
5) No fault
9 THEORY OF OPERATION
831806A1.CDR
1) Local composite current
converted into POS pulses
2) Received DC voltage
converted into RX pulses
831807A1.CDR
GE Multilin

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