GL.13
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Glossary
Hexadecimal Address—Infinite Bus
Harmonic Blocking
Method by which harmonics are used to block differential elements thereby
avoiding misoperations during inrush conditions.
Hexadecimal Address
A register address consisting of a numeral with an “h” suffix or a “0x” prefix.
High-Resolution
Data Capture
Reporting of 3 kHz low-pass analog filtered data from the power system at each
event trigger or trip at high sample rates of 8000 samples/second, 4000 samples/
second, 2000 samples/second, and 1000 samples/second.
High-Speed,
High-Current
Interrupting
Control Output
A control output similar to, but faster than, the hybrid control output. The high-
speed, high-current interrupting output uses an insulated-gate bipolar junction
transistor (IGBT) to interrupt (break) high inductive dc currents and to very
rapidly make and hold the current until a metallic contact operates, at which time
the IGBT turns off and the metallic contact holds the current. Unlike the hybrid
control output, this output is not polarity sensitive—reversed polarity causes no
misoperations.
HMI
Human-machine interface.
Homogeneous System
A power system with nearly the same angle (less than 5° difference) for the
impedance angles of the local source, the protected line, and the remote source.
HV
High voltage. System voltage greater than or equal to 100 kV and less than
230 kV.
Hybrid Control Output
Contacts that use an insulated-gate bipolar junction transistor (IGBT) in parallel
with a mechanical contact to interrupt (break) high inductive dc currents. The
contacts can carry continuous current, while eliminating the need for heat sinking
and providing security against voltage transients. These contacts are polarity-
dependent and cannot be used to switch ac control signals.
IA, IB, IC
Measured A-Phase, B-Phase, and C-Phase currents.
ICD File
IEC 61850 IED Capability Description file. XML file that describes IED
capabilities, including information on logical node and GOOSE support.
IEC 61850
Internationally standardized method of communications and integration
conceived with the goal of supporting systems of multivendor IEDs networked
together to perform protection, monitoring, automation, metering, and control.
IEC 61850-9-2
IEC 61850 standard that defines mapping of Sampled Values data onto
ISO 8802-3.
IED
Intelligent electronic device.
IEEE
Institute of Electrical and Electronics Engineers, Inc.
IG
Residual current, calculated from the sum of the phase currents. In normal,
balanced operation, this current is very small or zero.
IGBT
Insulated-gate bipolar junction transistor.
Inboard CT (bushing CT)
Current transformer physically positioned in such a way that the CT is bypassed
when the feeder is on transfer.
Independent Zone Timing
The provision of separate zone timers for phase and ground-distance elements.
Infinite Bus
A constant-voltage bus.
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