Siemens 7SJ82, Manual

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Fault Recording
Overview of Functions
All SIPROTEC 5 devices have a fault memory in which fault recordings are kept securely. Fault recording docu-
ments operations within the power system and the way in which protection devices respond to them. You can
read out fault recordings from the device and analyze them afterwards using evaluation tools such as SIGRA.
A fault record contains the following information:
•
Sample values of the analog input channels
•
Measured values calculated internally
•
Any binary signals (for example, pickup signals and trip signals of protection functions)
You can individually configure the signals to be recorded. Furthermore, you can define the starting condition,
the record duration, and the saving criterion of a recording. Fault records saved in the device are also available
after a loss of auxiliary voltage.
Structure of the Function
The Fault recorder function is a central device function. Both the recording criterion and the measured-value
and binary channels to be recorded are functionally preconfigured through the application templates. You are
able to individually adapt the configuration in DIGSI 5. The fault recording and the fault log are subject to the
same control. This ensures that real time, relative time, and numbering of the fault data are synchronized.
This means that all fault recordings function on the same real-time and relative-time basis.
The data read out via the DIGSI-PC are saved in COMTRADE format. Fault recording data can be transferred to
the substation automation technology by request in accordance with the standards via existing communica-
tion connections (such as IEC 61850, IEC 60870-5-103). The central device analyzes the data using appro-
priate programs.
Function Description
The Fault recorder function records the sampled values, specific to each device, of all analog inputs, the inter-
nally calculated measured values and the binary signals. The configuration, which is predefined for each
device via an application template, can be adapted individually.
i
i
NOTE
You can find detailed information about selecting and deleting fault records in the Operating Manual
(C53000-G5000-C003).
The fault memory of the device is automatically updated with every recording. When the fault memory is filled
completely, the oldest records are overwritten automatically. Thus, the most recent recordings are always
stored safely. The maximum number of recordings is 128.
Sampling Frequency
The analog measuring channels are sampled at a different sampling rate for fault recording. The
Sampling
frequency
parameter is used to set the desired sampling frequency. Possible setting values are 1 kHz, 2 kHz,
4 kHz, and 8 kHz . This setting value applies only to fault recording and does not affect protection functions or
calculated measured values.
Record Duration
The overall duration of a single fault recording comprises the total duration of the configurable recording
criterion, the
Pre-trigger time
and the
Post-trigger time
. You can set the parameters for these
components individually.
3.4
3.4.1
3.4.2
3.4.3
System Functions
3.4 Fault Recording
104 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017