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1MRK 502 071-UUS A
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
Usually the tap changer mechanism can give a signal, "Tap change in progress", during
the time that it is carrying through an operation. This signal from the tap changer
mechanism can be connected via a BIM module to TCMYLTC (84) or TCLYLTC (84)
input TCINPROG, and it can then be used by TCMYLTC (84) or TCLYLTC (84)
function in three ways, which is explained below with the help of figure 292.
b
VRAISE/VLOWER
tTCTimeout
TCINPROG
ANSI06000482 V1 EN-US
Figure 292:
Timing of pulses for tap changer operation monitoring
pos Description
a
Safety margin to avoid that TCINPROG is not set high without the simultaneous presence of an
VRAISE or VLOWER command.
tPulseDur .
b
Time setting
c
Fixed extension 4 sec. of
d
Time setting
tStable
e
New tap position reached, making the signal "tap change in progress" disappear from the tap
changer, and a new position reported.
f
The new tap position available in TCMYLTC (84) or TCLYLTC (84).
g
Fixed extension 2 sec. of TCINPROG, made internally in TCMYLTC (84) or TCLYLTC (84) function.
h
Safety margin to avoid that TCINPROG extends beyond
The first use is to reset the Automatic voltage control for tap changer function
TR1ATCC (90) for single control and TR8ATCC (90) for parallel control as soon as
the signal TCINPROG disappears. If the TCINPROG signal is not fed back from the
tap changer mechanism, TR1ATCC (90) or TR8ATCC (90) will not reset until
tTCTimeout has timed out. The advantage with monitoring the TCINPROG signal in
this case is thus that resetting of TR1ATCC (90) or TR8ATCC (90) can sometimes be
made faster, which in turn makes the system ready for consecutive commands in a
shorter time.
c
a
tPulseDur , made internally in TCMYLTC (84) or TCLYLTC (84) function.
Section 15
g
e
f
h
d
en06000482_ansi.vsd
tTCTimeout .
Control
629
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