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SME2-IS - Manual - 06- 2021
INTRODUCTION
S2 IEC terminology indicating the polarity of the CT secondary (as an
alternative to the terminal not marked with the ANSI dot symbol)
Self test Self diagnostics
Start Start of a protective function (instantaneous)
Trip Initiation of a protective function (timed)
Operating time The start and tripping time are determined by varying the input value
instantaneously (stepwise) from a set standby value to a set tripping
value.
Reset time Time required for the relay to reset, in specied conditions following
a trip, so that the successive tripping time does not differ by more
than a set percentage from the previously measured time. The reset
time is determined by changing the tripping reference value to the
reset reference value.
Overshoot time The overshoot time is determined by changing the input value instan-
taneously from the standby value to the tripping value and returning
it, again instantaneously, to the standby value. The difference be-
tween the tripping time of the test device (determined as above) and
the minimum length of the pulse which trips it is the overshoot time.
Reset ratio The ratio between the release value and the value of the same pa-
rameter that operates the device, in specied conditions. The reset
ratio may be less than or greater that 1, depending on whether the
device is an over or under voltage/current relay.
Reset delay An intentional reset delay which can be set by the user.
MMI Man Machine Interface
SW Software
FW Firmware
Thyvisor The parameter reading and setting software
Log le A text le which logs the operations of a program (Thyvisor)
Upgrade Firmware update
XML EXtensible Markup Language
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