Schweitzer Engineering Laboratories SEL-701 - Page 251

Date Code 20010719 701 Motor Protection Relay
SEL OGIC
®
Control Equations & Relay Logic
Relay Functional Overview
B.3
Figure B.1 Relay Processing Order.
Acquire & Filter Data
➢
Sample Low-Pass Filtered AC Signals
➢
Digitally Filter Sampled AC Signals
➢
Acquire Contact Input State
➢
Process Enabled Element Algorithms
➢
Advance Timers
➢
Update Relay Word
Process Relay Elements
➢
Evaluate Fixed Relay Logic
➢
Evaluate SEL
OGIC
Control Equation Variables
➢
Control Output Contacts
➢
Generate Front-Panel Targets, Messages
Process Logic
➢
Perform Relay Self-Tests
➢
Monitor RTD Temperatures
➢
Store Event, Start Reports, and SER Records
➢
Respond to Serial Port and Front-Panel Commands
Perform Background Tasks