We have ABB GSU Power transformers that have GE M2 Hydran monitoring units on them. We are trying to figure out where to set the proper alarm setting for gas content in the oil.
Our recommendation would be to take an oil sample from each transformer and make sure that H2 is below 100 ppm and CO below 350 ppm (current levels indicated in the IEEE Guide) - if that is true than set first alarm level to 150-200 ppm and the next to 250-300 ppm. Both would indicate the need for further investigation since Hydran is just a flag like sensor.
If you have any further questions, pls contact directly our Transformer Service center:
Customer Service Center
Address: ABB Inc. INYIV Customer Service Center MS 3L7 29801 Euclid Ave Wickliffe OH 44092-2530 USA
Phone: +1 800 435 7365 or 1 800 HELP 365
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