Schweitzer Engineering Laboratories SEL-421-4 - Page 1069

9.5
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Reporting
Data Processing
Figure 9.2 Input Processing of SEL-400 Series Relays With SV Remote Data Acquisition
Hi-Res Data
COMTRADE
Breaker
Monitor
8000 samples/second
Anti-Alias
Digital LPF
Control Inputs
Optoisolated
V&I Source
Select
Debounce
A/D
Hardware
Software
Filtered
Event
Report
Metering
SER
Protection and Automation
RMS
Digital Filter
Half-Cycle
Digital Filter
1-Cycle Cosine
Digital Filter
Digital Elements
Analog Quantities
Sync
IRIG-B
(BNC)
Time of Sample
High-Accuracy
Clock
PROTO := PMU
serial port(s)
Filter and
Down-Sample,
Correlated to
GPS Time
Reference
Synchrophasors
(50 or 60 per second,
depending on NFREQ setting)
Digital Elements (except control inputs)
Settable Pickup
and Dropout Voltage
Debounce
Direct-Coupled
SV Filtering
and Decoding
Scaling
Resampling
4.8 kHz/4 kHz SV
8 kHz