Siemens siprotec 7SJ63, Инструкция по эксплуатации

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Functions
6-163
7SJ63 Manual
C53000-G1140-C120-1
to the circuit breaker for a sufficient amount of time, even if the function which is-
sued the trip signal drops out quickly. The trip signal is only terminated after all pro-
tection functions drop out AND the minimum trip signal duration expires.
•
A further condition for terminating the trip signal is the opening of the circuit breaker.
This is monitored, using the status feedback indications from the circuit breaker and
current flow monitoring.
•
Finally, it is possible to latch the trip signal until it is manually reset (lockout func-
tion). The reset takes place either by pressing the LED reset key or by activating an
appropriately masked binary input. A precondition, of course, is that the circuit
breaker trip coil – as usual – remains energized at the circuit breaker as long as the
trip signal is present, and that the trip coil current is interrupted by the auxiliary con-
tacts of the circuit breaker.
Figure 6-69 Terminating the Trip Signal
6.18.3 Programming Settings for Tripping Logic
Trip Signal Dura-
tion The setting of the minimum trip signal duration at address
7PLQ75,3&0'
was
already discussed in Subsection 6.1.1. This time is valid for all protective functions that
can initiate trip signals, as well as for trip signals that are initiated using the device
function controller.
6.18.4 Fault Display on the LEDs/LCD
“No Trip – No Flag”
Option The indication of messages masked to local LEDs, and the maintenance of spontane-
ous messages, can be made dependent on whether the device has issued a trip sig-
nal. In this situation, messages are not reported, if one or more protective functions
have picked up on a fault, but a trip signal has not been issued yet by the device be-
cause the fault was cleared by another device (for instance, in another line). These
messages are then limited to faults in the line to be protected.
Figure shows the logic diagram for this function.
T
70LQ75,3&0'
S
R
Q
&
Fr
om
Trip
52 Open
S
R
Q
Lockout–Function
(Output Relay Stored)
Lockout Reset
(Using LED–Reset)
Relay TRIP
F# 0511
Pr
ot
ective
Functions
Addr. Setting Setting Options Default Setting Comment
210 TMin TRIP CMD 0.01 ~ 32.00 s 0.15 s Minimum Trip Command Duration
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