Date Code 20171006 Instruction Manual SEL-400 Series Relays
Instruction Manual
SECTION 13
SELOGIC Control Equation Programming
This section describes use of SELOGIC control equations and programming to
customize relay operation and automate substations. This section covers the fol-
lowing topics:
➤ Separation of Protection and Automation Areas on page 13.1
➤ SELOGIC Control Equation Setting Structure on page 13.2
➤ SELOGIC Control Equation Capacity on page 13.5
➤ SELOGIC Control Equation Programming on page 13.6
➤ SELOGIC Control Equation Elements on page 13.9
➤ SELOGIC Control Equation Operators on page 13.24
➤ Effective Programming on page 13.34
➤ SEL-311 and SEL-351 Series Users on page 13.36
Separation of Protection and Automation Areas
SEL-400 series relays act as protective relays and as smart nodes in distributed
substation automation. The relay collects data, coordinates inputs from many
interfaces, and automatically controls substation equipment. The relay performs
protection and automation functions but keeps programming of these functions
separate. For example, someone modifying or testing a capacitor bank control
system or station restoration system created in automation programming should
not be able to corrupt programming for protection tasks. Similarly, extended pro-
tection algorithms must operate at protection speeds unaffected by the volume of
automation programming.
SEL-400 series relays contain several separate programming areas discussed in
SEL
OGIC Control Equation Setting Structure. Separate access levels and pass-
words control access to each programming area and help eliminate accidental
programming changes. For example, use Access Level P to modify protection
configuration and protection freeform SEL
OGIC control equation programming
and Access Level A to access automation programming. If you want unlimited
access to both automation and protection configuration and programming, use
Access Level 2.
NOTE: If you want unlimited access
to both automation and protection
configuration and programming, log in
to Access Level 2.
Protection and automation areas must interact and exchange information. Protec-
tion and automation interact and exchange information through separate storage
areas (variables) for results of automation and protection programming. The relay
combines the results in the output settings that drive relay outputs to control sub-
station equipment. Separation of protection and automation storage areas is illus-
trated in Figure 13.1.
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