Schweitzer Engineering Laboratories SEL-701 - Nondedicated SEL OGIC Control Equation Variable Settings; Figure B.3 SEL OGIC Control Equation Variable Timer Logic

701 Motor Protection Relay Date Code 20010719
SEL
OGIC
®
Control Equations & Relay Logic
Nondedicated SEL
OGIC Control Equation Variable Settings
B.16
Nondedicated SELOGIC
Control Equation Variable Settings
The SEL-701 Relay is equipped with four nondedicated SELOGIC control
equation variables. Each variable has a defining SEL
OGIC control equation, a
time-delay pickup timer, and a time-delay dropout timer.
The SV1 SELOGIC control equation is the logical definition of the SV1 Relay
Word bit. Make the SELOGIC control equation setting by combining Relay Word bits
and logical operators.
The SV1PU setting defines the SV1T Relay Word bit time-delay pickup time.
SV1T asserts SV1PU seconds after the SV1 SEL
OGIC control equation result becomes
a logical 1. The SV1DO setting defines the SV1T Relay Word bit time-delay dropout
time. Once SV1T is asserted, it remains asserted for SV1DO seconds after the SV1
SEL
OGIC control equation result becomes a logical 0. Figure B.3 illustrates the
SELOGIC control equation variable timer logic. For an example control equation see
Equation B.4 on page B.11.
Settings SV2 through SV4 operate similarly.
Figure B.3 SELOGIC Control Equation Variable Timer Logic.
SVn
SVnT
SVn
SEL
OGIC
Setting
SVnPU
SVnDO
Relay
Word
Bits