Siemens SIPROTEC 7SJ62 Instruction Manual

Functions
6-162 7SJ62 Manual
C53000-G1140-C121-1
6.18 Protection Function Logic
The function logic is the heart of the device. It coordinates the sequence of both the
protective and auxiliary functions, processes functional decisions, and processes data
received from the system. In particular, the function logic is responsible for the follow-
ing:
• Processing Measurement and Detection Logic
• Processing Tripping Logic
6.18.1 Pickup Logic for the Entire Device
6.18.1.1 Description
General Device
Pickup and
Dropout
The pickup signals for all protective functions in the device are connected via an “OR”
function, and lead to the general device pickup. General device pickup is initiated by
the first function to pickup, and general device drop out occurs when the last function
drops out. A corresponding message indicating that general device pickup has oc-
curred is reported.
General device pickup is a precondition for a series of internal and external functions
that occur subsequently. The following are among the internal functions controlled by
general device pickup:
• Start of Trip Log: From general device pickup to general device drop out, all fault
messages are entered in the trip log.
• Initialization of Oscillographic Records: The storage and maintenance of oscillo-
graphic values can also be made dependent on the general device pickup.
• Generation of Spontaneous Messages: Certain fault messages are displayed in the
device display as so-called spontaneous messages (see below). This display can
also be made dependent on the general device pickup.
External functions can be controlled by general device pickup, using an output con-
tact. Examples are:
• Restarting devices
• Starting of additional devices, or similar
Spontaneous
Messages
Spontaneous messages are fault messages that appear in the display automatically
when general device pickup has occurred. For the 7SJ62 relay, these messages in-
clude:
• A message indicating the protective function that last picked up.
• A message indicating the protection function that last initiated a trip signal.
• The running time from general device pickup to general device dropout, with time
indicated in ms.
• The running time from general device pickup to initiation of the first trip signal by the
device, with time indicated in ms.
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Siemens SIPROTEC 7SJ62 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SJ62
Category	Relays
Language	English