Events And Actions - Siemens 7UT51 Instruction Manual

8
Time Overcurrent Protection (50HS and 50/51)
8.7

Events and Actions

Table describes the events that control and are
generated by the 50/51 and 50HS functions. 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"
Time Overcurrent Protection (50/51 and 50HS) Occurrence
Change in Operational Status
When the operational status of the 50/50HS/51 function changes,
-
a going event for the old status occurs followed by a coming
for the new status. The normal operational status is set in
Address 2101.
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.
Event 2306 temporarily turns off just the 50HS function, while
event 2307 temporarily turns off just the 50/51 function.
Pickup and Dropout
If any overcurrent function (50, 51, or 50HS) picks up, event 2411C
will occur. If no fault log is already open, a new one will open. The
pickup will dropout (event 2411G) when no overcurrent element
remains in pickup. Events 2412, 2413, and 2414 occur when each
phase picks up or drops out. Event 2421 occurs if the 50HS
function picks up, while event 2422 occurs if the 50/51 function
picks up.
Time Delay Before Trip
If an overcurrent function picks up, the corresponding
- -
time before trip delay starts. If the delay (addresses 2104, 2113, or
2115) is zero, these events do not occur.
Trip and Reset
The backup overcurrent element will trip if and when ANY of the
overcurrent elements (50, 51, or 50HS) has picked up and after the
corresponding time delay has not yet dropped out or already
caused a trip.
With the default marshalling a time overcurrent trip will light and
latch LED 4 and activate signal contact 3; and (as for a trip of any
element) light and latch LED 1, activate signal contact 1, and
activate all the trip contacts.
The overcurrent elements will reset (event 2411G, the same as for
dropout) when the same conditions that would cause a dropout
occur, and the reset time delay (Address 2118) expires.
Configuration Error
The overcurrent elements are set to monitor Side 3
(Address 7821), but the protected object type (Address 7801) does
not have three sides (7UT513 only).
Table 8.1 Events Related to Time Overcurrent Protection (50/51 and 50HS)
106
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 contact ("T").
LCD Abbreviation
BU OFF
- BU ACTIVE
event
BU BLOCK
>BU BLOCK
>BU BLKTrip
>BU50HS BLK
>BU50/51 BLK
Back Gen. Flt
BU Flt PhA
BU Flt PhB
BU Flt PhC
BU 50HS
BU 50/51
BU Tdly 50HS
BU Tdly 50/51
BU Gen.Trip
BU Err W3
7UT51 v3
Event Oper Fault In/Out
2401 C G
2403
C G
2402
C G
2303
2304
2306 C G
2307
C G
2411 C G
2412
C G
2413
C G
2414
C G
2421
C
2422
C
2441 C
2442
C
2451 C
2457 C
PRIM-2330C
S
S
S
I S
I S
I S
I S
S T
S
S
S
S
S
S T
S T
S T
S