High And High-High Alarms Cancellation; Fail Alarm; Fail Alarm Triggering - GE Hydran 201i Instruction Manual

Hydran* 201i Instruction Manual

11.4.5 High and High-High Alarms Cancellation

Note: To be cancelled, an alarm condition must disappear during a period of time
exceeding the corresponding alarm delay.
To cancel a High or High-High alarm, proceed as follows:
1. Find and solve the problem. Generally, the Hydran 201Ti's reading must be
verified by sampling the transformer's oil and performing a dissolved gas analysis
(DGA).
2. Acknowledge the alarm using the H201Ti's keypad or the Hydran Host software.
For the procedure, see Section 5.2.1, and the Hydran Host Software Manual. If the
problem has been corrected since a period of time exceeding the corresponding
alarm delay, the alarm message then disappears from the H201Ti's display;
otherwise, it simply stops flashing and remains on the display.
3. Press the Hydran 201Ci-1's corresponding push-button.

11.5 Fail Alarm

The fail alarm generally indicates to the user that there is a problem with the Hydran
201i System, not with the transformer. A fail alarm must therefore be verified and solved
rapidly because it indicates that the protection system of the transformer is not
functioning properly.

11.5.1 Fail Alarm Triggering

If the fail alarm relay is set to the Normal or Latch mode, the fail alarm is triggered
(the fail alarm relay is de-energized) when one of the following alarm conditions occurs:
• Supervisory link broken between the Hydran 201Ti and the Hydran 201Ci
Controller. This condition is the only one that affects only the fail alarm relay of
the Hydran 201Ci-1. All other conditions affect the fail alarm relays of both the
H201Ti and the H201Ci-1.
• AC power failure or partial failure (power voltage too low for the H201Ti to
function properly).
• Unable to restart the microprocessor.
• H201Ti not initialized (no alarm message appears on the H201Ti's display for this
condition). To cancel this alarm, enter the information requested on the H201Ti's
display (for details, see Section 5.2.5).
• More than 20 "watchdogs" occurred in 15 minutes (no alarm message appears on
the H201Ti's display for this condition).
• Detection of a hardware malfunction during the auto-verification phase of the
initialization (no alarm message appears on the H201Ti's display for this
condition).
• Setup Lost (for details, see Section 13.1.23).
MA-033 Rev. 14.0, 12-Nov-18
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