Sel 411L - Separation of Protection and Automation Areas

P.14.2
SEL-411L Relay Protection Manual Date Code 20151029
SELOGIC Control Equation Programming
Separation of Protection and Automation Areas
methods. Table 14.2 is a summary that compares SELOGIC control equation
programming in SEL-351 series relays and SEL-311 series relays with the
SEL-400 series.
Separation of Protection and Automation Areas
The relay acts as a protective relay and as a smart node 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 protection algorithms must operate at protection speeds
unaffected by the volume of automation programming.
The relay contains several separate programming areas discussed in SEL
OGIC
Control Equation Setting Structure. Separate access levels and passwords
control access to each programming area and help eliminate accidental
programming changes. For example, use Access Level P to modify protection
configuration and protection free-form SEL
OGIC control equation
programming and Access Level A to access automation programming.
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.
Protection 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 substation equipment. Separation of protection and
automation storage areas is illustrated in Figure 14.1.
Ta b l e 1 4. 2 S ELOGIC Control Equation Programming Summary
Element
SEL-351 Series/
SEL-311 Series
SEL-400 Series
Protection Free
Form
Automation
Free Form
SELOGIC control equation
variables
16 64 256
SEL
OGIC math variables 0 64 256
Conditioning timers
a
a
Similar to SEL-300 series relay SELOGIC control equation programming.
16 32 0
Sequencing timers 0 32 32
Counters 0 32 32
Latch bits 16 32 32