Hi all,
Can anyone shed some light on G.E.'s gas-filled dry transformers from the mid to late 1950's? I have a client who has a pair of 1000 kVA units and one of them is testing marginal with a Doble power factor test. I have worked in and around these transformers for the past 26 years and they have never had a problem. They are quite noisy, and they run hotter than heck even at half load, but they have always seemed to do the job. Unfortunately this is the first test they have ever had so there is no history to compare these results. I am skeptical of taking Doble tests at face value without corroborating bad data from other standard transformer tests. Of course, the other tests for this unit (midroohmmeter, megohmmeter, polarization, dielectric absorption, ttr, etc.) are all ok.
Considering just their age I am recommending replacement, but my customer would like to know if there are people in the industry who know more about them.
Many thanks, always.
PS. Forgot to mention, 4160 volt primary, 208/120 secondary
Can anyone shed some light on G.E.'s gas-filled dry transformers from the mid to late 1950's? I have a client who has a pair of 1000 kVA units and one of them is testing marginal with a Doble power factor test. I have worked in and around these transformers for the past 26 years and they have never had a problem. They are quite noisy, and they run hotter than heck even at half load, but they have always seemed to do the job. Unfortunately this is the first test they have ever had so there is no history to compare these results. I am skeptical of taking Doble tests at face value without corroborating bad data from other standard transformer tests. Of course, the other tests for this unit (midroohmmeter, megohmmeter, polarization, dielectric absorption, ttr, etc.) are all ok.
Considering just their age I am recommending replacement, but my customer would like to know if there are people in the industry who know more about them.
Many thanks, always.
PS. Forgot to mention, 4160 volt primary, 208/120 secondary
