GE Hydran 201i, Instruction Manual

Page: 191 / 300

Part 17997 Rev. 6, March 2011 10-1
Chapter 10
Alarms
This Chapter explains in detail the sophisticated alarm features of the Hydran 201 i System
from an operator’s point of view.
Note: The complete list of alarm messages and each corresponding troubleshooting
procedure are given in Section 12.1 on page 12-1.
There are two methods to set the value of the alarm parameters:
• Using the Hydran Host software (see the Hydran Host Software Manual ).
• Directly, using the Hydran 201T i ’s keypad and display (they are explained in detail in
Chapter 4).
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”
CAUTION
WARNING
Wiring the alarm contacts (see Section 10.2.1 on page 10-4) 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.
CAUTION
WARNING
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
Canada does not suggest nor recommend specific alarm set points.
It is solely the responsibility of the user to determine the appropriate
settings.