Development of a wavelet-based algorithm to detect and determine ...

4.3. FILES FOR DATA EXCHANGE 20
the input conditions of the study can be changed, transient simulation programs
can provide many different test cases for a relay.
• Analog simulators
Analog simulators model power system operations and transient phenomena,
with scaled values of resistance, inductance and capacitance, operating at greatly
reduced values of voltages and current. The components usually are organized
with similar line segments that can be connected together to form longer lines.
The frequency response of the analog simulator primarily is limited by the equiv-
alent length of the model segment and typically ranges from 1 - 5 kHz. The
analog output of the simulator could be converted to digital records with appro-
priate filtering and sampling. The power network simulator at the Department
for Electrical Power Systems is such an analog simulator.
4.3 Files for data exchange
The COMTRADE data format consists of three files, the configuration file, the data file
and the header file (the header file is defined in [4] only). The configuration file and
the header file are ASCII files, the data file is an ASCII or binary file, as it is configured
in the configuration file.
The extension of the file name is used to identify the type of file, ".HDR" for header,
".CFG" for configuration, and ".DAT" for data file.
4.3.1 Header file (xxx...xxx.HDR)
The header file is created by the originator of the fault data using a word processor
program. The data is intended to be printed and read by the user. The creator of the
header file can include any information in any format desired. The header files are
free-form ASCII files of any length. ASCII files can be read by simple editors and word
processors.