Processing Order And Processing Interval - Schweitzer Engineering Laboratories SEL-311C Instruction Manual

H.10 Setting SEL Control Equations
OGIC

Processing Order and Processing Interval

Processing Order and Processing Interval
SEL-311C Relay
The relay elements and logic (and corresponding SEL
settings and resultant Relay Word bits) are processed in a predetermined order.
They are processed every quarter-cycle (1/4-cycle), and the Relay Word bit
states (logical 1 or logical 0) are updated with each quarter-cycle pass. Thus,
the relay-processing interval is 1/4-cycle. Once a Relay Word bit is asserted, it
retains the state (logical 1 or logical 0) until it is updated again in the next
processing interval. Logical outputs of SEL
delayed by 1/4-cycle due to relay element processing order.
Instruction Manual
control equation
OGIC
control equations may be
OGIC
Date Code 20060320