Date Code 20010719 701 Motor Protection Relay
Glossary
A Abbreviation for amps or amperes; units of electrical
current magnitude.
Alias User assigned name of a Relay Word bit used in the
SEL-701 Relay Sequential Events Recorder (SER)
function. The assigned alias appears in the SER report
in place of the Relay Word bit, making the SER report
easier to review.
Ambient Temperature Temperature of the motor cooling air at the cooling air
inlet. Measured by an RTD whose location setting is
AMB.
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:
27 Undervoltage Element
37 Underpower Element
46 Phase Balance or
Current Unbalance Element
47 Phase Sequence Element
49 Thermal Element
50 Overcurrent Element
52 AC Circuit Breaker
55 Power Factor Element
59 Overvoltage Element
66 Jogging Device (limits number of operations
within a given time of each other)
81 Frequency Element
These numbers are frequently used within a suffix
letter to further designate their application. The suffix
letters used in this instruction manual include:
PPhase Element
G Residual/Ground Element
N Neutral/Ground Element
Q Negative-Sequence (3I2) Element
Antibackspin Protection Relay function that prevents the motor from being
started for a short time after it is stopped. Used on
pump motors to prevent a start attempt while fluid is
running backward through the pump.
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