Functions
2.8 Function Control
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
157
Spontaneous indications
Spontaneous indications are fault indications which appear in the display automatically following a general fault
detection or trip command of the device. For the 7VK61, these indications include:
„Relay PICKUP“:
protective function that picked up;
„S/E/F TRIP“:
protective function which tripped (only device with graphical display);
„PU Time“
:
Operating time from the general pickup to the dropout of the device, in ms;
„TRIP Time“
:
the operating time from general pickup to the first trip command of the
device, in ms;
2.8.1.5
Tripping Logic of the Entire Device
General Trip
All trip signals for the protective functions are connected by OR and generate the message
„Relay TRIP“
.
This can be allocated to LED or output relay.
Terminating the Trip Signal
Once a trip command is initiated, it is phase segregatedly latched (in the event of three-pole tripping for each
of the three poles) (refer to Figure 2-62). At the same time, the minimum trip command duration
TMin TRIP
CMD
is started. This ensures that the trip command is output to the circuit breaker for a sufficiently long time
even if the tripping protective function resets very rapidly. The trip commands can only be reset after all tripping
protective functions have dropped out and after the minimum trip command duration has elapsed.
A further condition for the reset of the trip command is that the circuit breaker has opened, in the event of single-
pole tripping the relevant circuit breaker pole. In the function control of the device, this is checked by means of
the circuit breaker position feedback (Section „Detection of the Circuit Breaker Position“) and the flow of cur-
rent. In address
1130
, the residual current
PoleOpenCurrent
is set which is certainly undershot when the
circuit breaker pole is open. Address
1135
Reset Trip CMD
determines under which conditions a trip
command is reset. If
CurrentOpenPole
is set, the trip command is reset as soon as the current disappears.
It is important that the value set in address
1130
PoleOpenCurrent
(see above) is undershot. If
Current
AND CB
is set, the circuit breaker auxiliary contact must send a message that the circuit breaker is open. It is
a prerequisite for this setting that the position of the auxiliary contact is allocated via a binary input. If this ad-
ditional condition is not required for resetting the trip command (e.g. if test sockets are used for protection test-
ing), it can be switched off with the setting
Pickup Reset
.
If the 7VK61 relay is operated without current transformer connection, the setting
1135
Reset Trip CMD
=
CurrentOpenPole
, termination of the trip command is only determined by the minimum trip time (
TMin TRIP
CMD
). If the setting is
Reset Trip CMD
=
Current AND CB
, the trip command will be terminated by the
auxiliary contacts of the circuit breaker.
Summary of Contents for Siprotec 7VK61
Page 8: ...Preface SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 8 ...
Page 14: ...Contents SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 14 ...
Page 316: ...Literature SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 316 ...
Page 328: ...Glossary SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 328 ...
