Siemens 7UT51

7UT51 v3
Tank Leakage Protection (64T)
10
PRIM-2330C 115
10.4 Time Delays
If a 64T pickup occurs, the element will immediately
trip unless a time delay has been set in Address 2725.
If a trip occurs, the contacts and LEDs marshalled to
the event will remain activated until the measured
tank-leakage current drops below the dropout level set
in Address 2709. If desired, the trip-state can be
prolonged by a reset time delay that is set in
Address 2727.
10.5 Events and Actions
This table describes the events that control and are
generated by the 64T function. They are listed in the
order that they are likely to occur, which is roughly in
numerical order by their event identification number
(shown in the “Event” column). The text in the “LCD
Abbreviation” column is the corresponding text that will
appear when viewing logs on the front panel LCD
display. In the “Oper” column, a letter “C” or “G”
indicates that the “Coming” and/or “Going” events are
logged in the Operational Log, while if in the “Fault”
column they indicate that the events are logged in the
open fault log. A letter in the “In/Out” column indicates
that the event can be controlled by a binary-signal
input (“I”), control an LED and/or signal contact (“S”),
and/or control a trip (command) contact (“T”).
2725 T
-
DELAY
Time delay between pickup and trip for tank leakage
protection (in addition to the inherent operating time of
the relay).
Range: 0.00
–
60.00 s (or ∞ for no trip)
Default: 0.00 s
Operating Tolerance: 1% of setting value or 10 ms
2727 T
-
RESET
Additional time to remain in trip state after dropout
of the 64T element (in addition to the inherent
reset time of the relay).
Range: 0.00
–
60.00 s
Default: 0.10 s
Operating Tolerance: 1% of setting value or 10 ms
Tank Leakage Protection (64T) Occurrence LCD Abbreviation Event Oper Fault In/Out
Change in Operational Status
When the operational status of the 64T function changes, a
going
-
event for the old status occurs followed by a coming
-
event
for the new status. The normal operational status is set in
Address 2701.
Ta n k OF F
Ta n k B L O C K
Tank ACTIVE
5911
5912
5913
C
C
C
G
G
G
S
S
S
A binary input can temporarily change the operational status of the
function (see Section 13.2 on page 126). Any outputs marshalled
to these events will remain actuated for as long as the binary input
remains actuated.
>Tank BLOCK
>TankBloTrip
5903
5905
I
I
S
S
Pickup (and Reset or Dropout)
If the tank leakage current rises above the pickup level (set in
Address 2703 or 2704), event 5917:C will occur. The inherent
pickup operating time (if the tank leakage current is twice the
pickup level and without parallel operation of other protection
elements) is approximately 25 to 35 ms (at 60Hz). If no fault log is
already open, a new one will start.
When the tank leakage current drops below the dropout level set in
Address 2709, event 5917:G will occur. The inherent dropout
operating time is approximately 35 ms (at 60Hz).
Tank Gen. Flt 5917 CG S T