Sel SEL-421 - Selogic Control Equation Programming; Selogic Control Equation History

Date Code 20111215 Reference Manual SEL-421 Relay
Section 3
R.Reference Manual
SELOGIC Control Equation Programming
This section describes use of SELOGIC
®
control equation programming to
customize relay operation and automate substations. This section covers the
following topics:
➤ SELOGIC Control Equation History on page R.3.1
➤ Separation of Protection and Automation Areas on page R.3.2
➤ SELOGIC Control Equation Programming on page R.3.4
➤ SELOGIC Control Equation Setting Structure on page R.3.6
➤ Multiple Setting Groups on page R.3.8
➤ SELOGIC Control Equation Capacity on page R.3.11
➤ SELOGIC Control Equation Elements on page R.3.12
➤ SELOGIC Control Equation Operators on page R.3.25
➤ Effective Programming on page R.3.34
➤ SEL-311 and SEL-351 Series Users on page R.3.36
SELOGIC Control Equation History
SEL introduced SELOGIC control equations in the SEL-300 series relays to
provide relay operation customization. SEL
OGIC control equations in the
SEL-421 Relay provide both protection application flexibility and a platform
for substation automation.
SEL
OGIC control equation programming in the SEL-421 includes several
features and capabilities not included in SEL-300 series relays. The new
features with a brief description are listed in Table 3.1.
Table 3.1 Advanced SEL-421 SELOGIC Control Equation Features
(Sheet 1 of 2)
Feature Description
Protection/automation separation Segregation of protection and automation work
and settings
Free-form logic Custom logic operation and execution order
Comments Documentation of SEL
OGIC control equations
within the equation
Math operations Calculations for automation or extended protec-
tion functions
Sequencing timers Additional timers designed for sequencing auto-
mated operations