10.4.4 High And High-High Alarms Triggering; 10.4.5 High And High-High Alarms Cancellation - GE Hydran 201 i Instruction Manual

Note the following points:
• If the Hydran 201Ti undergoes a power failure that lasts less than 1/6 of the trend period,
the corresponding trend reading remains constant until the H201Ti is powered up again.
• If the power failure lasts more than 1/6 of the trend period, the corresponding trend
reading is reset to zero.
• If the user changes the hourly or daily trend period, the corresponding trend reading is
reset to 0.0 ppm/period.

10.4.4 High and High-High Alarms Triggering

If the High alarm relay is set to the Normal or Latch mode, the High alarm is triggered (the
High alarm relay is energized) when one of the alarm conditions exceeds the corresponding
High alarm set point during a period of time exceeding its alarm delay.
The same way, if the High-High alarm relay is set to the Normal or Latch mode, the High-
High alarm is triggered (the High-High alarm relay is energized) when one of the alarm
conditions exceeds the corresponding High-High alarm set-point during a period of time
exceeding its alarm delay.
Each alarm (High and High-High) can be triggered by one or several of the following
conditions (for details, see Section 10.1.1 on page 10-2):
• Gas level (GasLevel submenu)
• Hourly trend (HourlyTrend submenu)
• Daily trend (DailyTrend submenu)
Each alarm condition has an adjustable alarm delay that is common to all levels (High,
High-High, Low and Low-Low) of this condition.

10.4.5 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)
Part 17997 Rev. 6, March 2011
Gas High and High-High Alarms
10-13