Functions
2.48 Protection Function Control
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
327
2.48 Protection Function Control
The function logic coordinates the sequence of both the protective and ancillary functions, processes the func-
tional decisions, and data received from the system.
2.48.1 Pickup Logic for the Entire Device
This section describes the general pickup and spontaneous messages in the device display.
2.48.1.1 Functional Description
General Device Pickup
The pickup signals for all protection functions in the device are logically OR-combined, and lead to the general
device pickup. It is initiated by the first function to pickup and drops out when the last function drops out. In
consequence, the following message is reported: „Relay PICKUP“.
The general pickup is the precondition for a number of internal and external consequential functions. The fol-
lowing are among the internal functions controlled by general device pickup:
• Start of Trip Log: From general device pickup to general device dropout, all fault indications are entered in
the trip log.
• Initialization of Oscillographic Records: the storage and maintenance of fault values can also be made de-
pendent on the occurrence of a trip command.
• Generation of Spontaneous Messages: Certain fault messages are displayed in the device display as so-
called spontaneous messages (see below „Spontaneous Messages“). This indication can also be made de-
pendent on the general device trip.
Spontaneous Display Messages
Spontaneous messages are fault messages that appear in the display automatically when general device
pickup has occurred. For the 7UM62, these messages include:
„Relay PICKUP“: the protection function that last picked up
„Relay TRIP“: the protection function that last initiated a trip signal;
„PU Time“: running time from general device pickup to dropout of the device, in ms;
„Trip time“: running time from general device pickup to initiation of the first trip signal by
the device, with time indicated in ms;
If you use a graphical display, spontaneous messages are only displayed if parameter Spont. FltDisp. is
set to YES (see also Section 2.2). On the 4-line display this parameter is hidden.
Note that the thermal overload protection does not have a pickup comparable with the other protection func-
tions. The general device pickup time (PU Time) is started with the trip signal, which starts the trip log. The
dropout of the thermal image of the overload protection ends the fault case and, thereby the running PU Time.
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