CIRCUTOR QNA500 series - Manual (Page 42)

POWER QUALITY ANALYZER QNA500 8IO
QNA500 8IO Instruction manual 42 / 111
8.13.4.- .EVA FILE
This file stores any event that is not related to the power quality analyzer's measurements, such as, for
example, a setup modification, change of time, power supply interruption or deleted files. Therefore,
this file is an incident registry file that acts as an analyzer's supervisor and as a filter against access to
the analyzer.
QNA500 can detect and record the following events, among others:
• Battery Off: It will state the moment when the QNA500 has stopped operating. This moment
depends on the value programmed for the equipment to work with the internal battery when
there has been an interruption in the auxiliary power supply.
• Power Supply On: Indicates the moment when the power supply is connected to the QNA500
power quality analyzer.
• Power Supply Off: Indicates the moment when the power supply is disconnected from the
QNA500 8IO. The power quality analyzer is powered with the battery at this moment.
• Modified Setup: Records the moment when the analyzer's setup is modified.
• Memory Format: Moment when the user has initialised the internal memory of the QNA500
power quality analyzer.
• Internal memory and force format: An internal memory error has been detected and the
QNA500 analyzer will automatically initialise the whole memory.
• Delete File: Moment when the user has deleted a file from the internal memory of the QNA500
analyzer. When the first piece of data appearing in the .EVE file is the deletion of a file, this
means that the events file has been deleted.
• Change of Time: The equipment's time or date has been changed. This event must be
detected, since hourly modifications between measurements often correspond to time changes.
8.13.5.- .CFG AND .DAT FILES
These files store each transient recorded with the QNA500 power quality analyzer. The information
associated with each transient is composed of a .CFG file and .DAT file.
The format of these files follows the COMTRADE international standard (Common Format for Transient
Data Exchange for power systems), which is a file format for oscillographic data. This protocol is
frequently used by companies for recording oscilloscopes and simulations related to the design of high-
voltage substations. The format of the COMTRADE file has been standardised by the IEEE.