Self-Test; Interference-Level Evaluation; Event Memory And Real-Time Clock - Siemens SWT 3000 Equipment Manual

The controller triggers an interrupt in the DSP for the transmission of outgoing protection commands. For the
receiving of incoming protection commands, the DSP triggers an interrupt in the controller. The controller
continuously monitors the functionality of the DSP with a watchdog function.

Self-test

7.1.6
Self-test functions are executed in the self-test phase after every program restart. If there is a fault, it enables
the fault to be reliably pinpointed at the module level.
The following tests are performed in the self-test:
•
Checking the program and data memory of the controller and DSP for functionality
•
Checking of the configuration and parameter data for plausibility
•
Checking interfaces and communication between controller and DSP
•
Checking the controller IFC module interface
•
Checking interfaces to the CLE (as far as possible)
If a fault is detected in the self-test phase, all inputs and outputs of the interface modules are disconnected
and the corresponding alarms are activated (LED, and relays). You can interrogate the internal alarm trace
with the service program PowerSys via the local interface.
7.1.7

Interference-Level Evaluation

The interference-level evaluation records the level of interference signals applied for a long time and superim-
posed on the wanted signal. If a fixed level threshold is exceeded, the interference-level alarm (SNALR) is
signaled. In the switching functions mode, the interference-level evaluation is only activated if a single tone
is transmitted (guard or command tone).

Event Memory and Real-Time Clock

7.1.8
Protection commands and alarms are provided with time, date, and a registration number before they are
entered in the event memory. The service PC reads them out. The remote station can also reads them out with
remote maintenance.
The following events are entered:
•
Incoming protection commands from IFC-D/P and EN100
•
Outgoing protection commands to the IFC-D/P and EN100
•
Detected alarms
•
Program restart
•
Changing date and/or time
•
Changing the configuration
If there is an overflow, the oldest entry in the event memory is overwritten.
For more information about the event memory, refer to chapter Service Program PowerSys and MemTool
Flash Programming
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
C53000-G6040-C605-1, Edition 03.2020
5.1.1 About the Service Program PowerSys
Processing Unit Module
7.1 Functions of the PU4 module
of this Equipment Manual.
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