Date Code 20081022 Instruction Manual SEL-787 Relay
Glossary
Instructi on Manual
A
Abbreviation for amps or amperes; units of electrical current magnitude.
ACSELERATOR
®
QuickSet
®
SEL-5030
Software
A Windows
®
-based program that simplifies settings and provides analysis
support.
ACSELERATOR Architect
®
SEL-5032 Software
Design and commissioning tool for IEC61850 communications.
Ambient Temperature
Temperature of the ambient air adjacent to the transformer. Measured by an
RTD whose location setting is AMB.
Analog
In this instruction manual, Analog is synonymous with Transducer.
ANSI Standard
Device Numbers
A list of standard numbers used to represent electrical protection and control
relays. The standard device numbers used in this instruction manual include:
24 Volts/Hz Element (Overexcitation)
27 Undervoltage Element
32 Directional Power
50 Instantaneous Overcurrent Element
51 Inverse Time-Overcurrent Element
52 AC Circuit Breaker
55 Power Factor Element
59 Overvoltage Element
81 Frequency Element
87 Differential Element
These numbers are frequently used within a suffix letter to further designate
application. The suffix letters used in this instruction manual include:
P Phase Element
G Residual/Ground Element
N Neutral/Ground Element
Q Negative-Sequence (3I2) Element
Apparent Power, S
Complex power expressed in units of volt-amps (VA), kilovolt-amps (kVA), or
megavolt-amps (MVA). Accounts for both real (P) and reactive (Q) power
dissipated in a circuit: S = P + jQ.
ASCII
Abbreviation for American Standard Code for Information Interchange.
Defines a standard way to communicate text characters between two
electronic devices. The SEL-787 Transformer Protection Relay uses ASCII
text characters to communicate using the relay front- and rear-panel EIA-232
serial ports.
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