GL.19
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Glossary
Protection and Automation Separation—Report Settings
Protection and
Automation Separation
Segregation of protection and automation processing and settings.
Protection Settings Group
Individual scheme settings for as many as six different schemes (or instances).
Protection-Disabled State
Suspension of relay protection element and trip/close logic processing and de-
energization of all control outputs.
Protection Zone
(also see Bus-Zone)
Area of protection formed by a minimum of one bus-zone. A protection zone can
include more than one bus-zone. For example, merging two bus-zones results in a
single protection zone. When no bus-zones are merged, a protection zone and a
bus-zone have the same meanings.
PRP
Parallel Redundancy Protocol, as defined in IEC 62439-3 for network
redundancy and seamless failover.
PT
Potential transformer. Also referred to as a voltage transformer or VT.
PTP
Precision Time Protocol, as defined in IEEE 1588 for high-accuracy clock
synchronization.
PTR
Potential transformer ratio.
Quadrilateral
Characteristic
A distance relay characteristic on an R-X diagram consisting of a directional
measurement, reactance measurement, and two resistive measurements.
Qualifier Code
Specifies type of range for DNP3 objects. With the help of qualifier codes, DNP3
master devices can compose the shortest, most concise messages.
R_TRIG
Rising-edge trigger. Boolean SELOGIC control equation operator that triggers an
operation upon logic detection of a rising edge.
RAM
Random Access Memory. Volatile memory where the relay stores intermediate
calculation results, Relay Word bits, and other data.
Reactance Reach
The reach of a distance element in the reactive (X) direction in the R-X plane.
Real Power
Power that produces actual work. The portion of apparent power that is real, not
imaginary.
Reclose
The act of automatically closing breaker contacts after a protective relay trip has
opened the circuit breaker contacts and interrupted current through the breaker.
Relay Word Bit
A single relay element or logic result. A Relay Word bit can equal either logical 1
or logical 0. Logical 1 represents a true logic condition, picked up element, or
asserted control input or control output. Logical 0 represents a false logic
condition, dropped out element, or deasserted control input or control output. Use
Relay Word bits in SEL
OGIC control equations.
Remapping
The process of selecting data from the default map and configuring new indices
to form a smaller data set optimized to your application.
Remote Bit
A Relay Word bit with a state that is controlled by serial port commands,
including the CONTROL command, a binary Fast Operate command, DNP3
binary output operation, or a UCA control operation.
Report Settings
Event report and Sequential Events Recorder (SER) settings.
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