Sel 411L - Figure 8.1 Signal Processing in the Relay

P.8.3
Date Code 20151029 Protection Manual SEL-411L Relay
Oscillography, Events, and SER
Data Processing
Figure 8.1 Signal Processing in the Relay
8 kHz
A/D
Low Pass
Filter
Hi-Res Data
COMTRADE
Breaker
Monitor
8000 samples/second
Anti-Alias
Digital LPF
Voltages
Control Inputs
Optoisolated
2 kHZ
V&I Source
Select
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)
Debounce
Band
Pass
Filter
1.5625 MHz
A/D
Currents
Traveling Wave
COMTRADE
Traveling
Wave Fault
Location