701 Motor Protection Relay Date Code 20010719
Glossary
Antijogging Protection–CRC-16
GL.2
Antijogging Protection Relay functions that prevent the motor from being
started too many times within an hour (also referred to
as Starts Per Hour protection) or too soon following the
last start (also referred to as Minimum Time Between
Starts protection).
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-701 Relay uses ASCII text
characters to communicate using its front- and rear-
panel EIA-232 serial ports.
Assert To activate; to fulfill the logic or electrical
requirements needed to operate a device. To apply a
short-circuit or closed contact to an SEL-701 Relay
input. To set a logic condition to its true state
(logical 1). To close a normally-open output contact.
To open a normally-closed output contact.
Breaker
Auxiliary Contact
A spare electrical contact associated with a circuit
breaker that opens or closes to indicate the breaker
position. A form-a breaker auxiliary contact (ANSI
Standard Device Number 52A) closes when the
breaker is closed, opens when the breaker is open. A
form-b breaker auxiliary contact (ANSI Standard
Device Number 52B) opens when the breaker is closed
and closes when the breaker is open.
Checksum A numeric identifier of the firmware in the relay.
Calculated by the result of a mathematic sum of the
relay code.
CID Abbreviation for Checksum Identifier. The checksum
of the specific firmware installed in the relay.
Contiguous Items in sequence; the second immediately following
the first.
CR_RAM Abbreviation for Critical RAM. Refers to the area of
relay Random Access Memory (RAM) where the relay
stores mission critical data.
CRC-16 Abbreviation for Cyclical Redundancy Check-16. A
mathematical algorithm applied to a block of digital
information to produce a unique, identifying number.
Used to ensure that the information was received
without data corruption.
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