MA-033 Rev. 14.0, 12-Nov-18
Hydran* 201i Instruction Manual
11 ALARMS
This Chapter explains in detail the sophisticated alarm features of the Hydran 201i
System from an operator’s point of view.
Note: The complete list of alarm messages and each corresponding troubleshooting
procedure are given in Section 13.1.
Wiring the alarm contacts (see Section 11.2.1 to safety tripping
devices of the equipment monitored by the Hydran 201i System
is not recommended because this system is an early warning
device of incipient faults. Information obtained using the
Hydran 201i System should always be used in conjunction with
other available information to decide if the monitored
equipment should be removed from service.
This Chapter contains examples of how to set the gas alarm
parameters of the Hydran 201i System. The values used are
fictitious and do not correspond to any standard. General
Electric does not suggest nor recommend specific alarm set
points. It is solely the responsibility of the user to determine
the appropriate settings.
There are three methods to set the value of the alarm parameters:
• Using the Hydran Host software for Hydran protocol only (see the Hydran Host
Software Manual).
• Using Perception software (for Modbus protocol only)
• Directly, using the Hydran 201Ti’s keypad and display (they are explained in
detail in Chapter 5).
For more information on the interpretation of gases in oil, refer to the following guides:
• IEEE Standard C57.104-1991, “IEEE Guide for the Interpretation of Gases
Generated in Oil-Immersed Transformers”.
• IEC 60599-1999, “Mineral Oil-Impregnated Electrical Equipment in Service –
Guide to the Interpretation of Dissolved and Free Gases Analysis”.
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