URAISE/ULOWER
tTCTimeout
TCINPROG
a
h
d
e
f
g
c
b
IEC06000482_2_en.vsd
IEC06000482 V2 EN-US
Figure 134:
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
URAISE or ULOWER command.
b
Time setting
tPulseDur.
c
Fixed extension 4 sec. of
tPulseDur, made internally in TCMYLTC or TCLYLTC function.
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 or TCLYLTC.
g
Fixed extension 2 sec. of TCINPROG, made internally in TCMYLTC or TCLYLTC function.
h
Safety margin to avoid that TCINPROG extends beyond
tTCTimeout.
The first use is to reset the Automatic voltage control for tap changer function
TR1ATCC for single control and TR8ATCC for parallel control as soon as the
signal TCINPROG disappears. If the TCINPROG signal is not fed back from the
tap changer mechanism, TR1ATCC or TR8ATCC will not reset until
tTCTimeout
has timed out. The advantage with monitoring the TCINPROG signal in this case is
thus that resetting of TR1ATCC or TR8ATCC can sometimes be made faster,
which in turn makes the system ready for consecutive commands in a shorter time.
The second use is to detect a jammed tap changer. If the timer
tTCTimeout
times
out before the TCINPROG signal is set back to zero, the output signal TCERRAL
is set high and TR1ATCC or TR8ATCC function is blocked.
The third use is to check the proper operation of the tap changer mechanism. As
soon as the input signal TCINPROG is set back to zero TCMYLTC or TCLYLTC
function expects to read a new and correct value for the tap position. If this does
not happen the output signal CMDERRAL is set high and TR1ATCC or TR8ATCC
function is blocked. The fixed extension (g) 2 sec. of TCINPROG, is made to
prevent a situation where this could happen despite no real malfunction.
1MRK 506 375-UEN A
Section 12
Control
Railway application RER670 2.2 IEC
319
Application manual
Summary of Contents for RELION RER670
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