Date Code 20010625
Setting SEL
OGIC
®
Control Equations
G-9
SEL-311L Instruction Manual
Note that the SEL
OGIC
control equation variables (SEL
OGIC
control equation settings SV1
through SV16) are processed after the trip equation (SEL
OGIC
control equation trip setting TR).
Thus, any tripping via Relay Word bits SV1 through SV16 can be delayed as much as 1/4 cycle.
For most applications, this is probably of no consequence.
The SEL
OGIC
control equation settings as a whole are limited to no more than 447 elements and
49 rising-edge or falling-edge operators.
SEL
OGIC
control equation settings that are set directly to 1 (logical 1) or 0 (logical 0) also have
to be included in these limitations—each such setting counted as one element.
After SEL
OGIC
control equation settings changes have been made and the settings are saved, the
SEL-311L Relay responds with the following message:
xxx Elements and yy Edges remain available
indicating that “xxx” Relay Word bits can still be used and “yy” rising or falling edge operators
can still be applied in the SEL
OGIC
control equations for the particular settings group.
P
ROCESSING
O
RDER AND
P
ROCESSING
I
NTERVAL
The relay processes the Relay Words, SEL
OGIC
, and backup protection algorithms every 1/4
cycle and performs associated updates at the end of the 1/4-cycle interval. However, the
differential protection algorithms are processed every 1/16 cycle. The Relay Word bits remain in
their current state, asserted or deasserted, until the next processing interval. The setting, EHST =
Y, allows the high-speed differential processing to directly trip the high-speed output contacts
(OUT201–OUT206) without delays from the 1/4-cycle processing interval.
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