12.2.2 Historic Data Reading
The historic data simply consists of information (self-explanatory message, date and
time of occurrence, etc.) recorded by and within the Hydran 201Ti when an event
happens (alarm triggering, parameter modification by the user, etc.) or at fixed,
adjustable logging rates.
Historic data can be read as follows:
• With the H201Ti local user interface: Simply access the History submenu with the
H201Ti’s keypad. For details, see Section 5.5.1.
• With the Hydran Host software or Perception software: The H201Ti’s historic data
can be accessed easily using General Electric’s Hydran Host (for Hydran protocol
communication only) or Perception (for ModBus communication only) software.
Simply transfer the historic data from the H201Ti’s toward the Hydran Host or
Perception software with the Express Download button in the Network Survey
window. The procedure is described in the Hydran Host Software Manual.
• With the Perception software
12.3 Data Analysis
The Hydran 201i System generates numerous data to assist in the early detection of
incipient faults in transformers or other oil-filled equipment.
Other parameters (transformer load, oil temperature, dissolved gas analysis [DGA])
can also be useful in interpreting the gas level and trend evolutions. This information
can even be used to comment the historic data (see the Hydran Host Software Manual).
An excellent source of information on the interpretation of gases in oil is the IEEE
Standard C57.104-1991 “Guide for the Interpretation of Gases in Oil-Immersed
Transformers.”
When interpreting the data of the Hydran 201i System, take the following points in
consideration:
• An alarm can be triggered because of a misadjusted alarm set point. The historic
data file Events indicates the modifications to the parameter settings (see Section
12.2.2 on above).
• An alarm (example: Low gas level) can be triggered following some maintenance
procedure on the transformer, such as vacuum degassing of the oil.
• Daily load cycles and intermittent transformer operations both affect the Hydran
201Ti’s gas level and hourly trend readings.
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