Works like a charm. get some earplugs and replace it when it blows up ? maybe LOOSEN some bolts on the frame and see if the buzz changes. Transformers often make humming and buzzing sounds depending on the degree of loading, changes in load, and the harmonic content of the loads. A damper on this line brought silence. The load may be light at the time, and the panel therefore not very exciting to look at, but there may still be a problem. I don’t think you have anything thermally. If the noise is so loud that it is bothersome then you may need to replace the reversing valve solenoid or transformer. With rergards to the pads, both the pads it rest on and the interior frame pads look fine. Was the hum really loud, almost sounding like the metal may rattle? Thanks for the input. The transformer was humming a lot. As Pierre said, transformers hum…they all do. Is this typical for a transformer of this type? Usually not. If the hum is still present then you might have a noisy outdoor transformer. Winding resistance and excitation test? supvr. When they start to sound more like a fire alarm buzzer, then you worry. Because of that, the noise is generally different. I've never had to deal with GE, but I've had plenty of direct dealings with a few manufacturers over issues with their products over the years. An in-depth explanation of why this occurs can be found on the IRINFO.ORG website at the following URL: http://www.irinfo.org/tip_of_week_2006.html#t09052006. Buzzing/humming sound of a transformer Transformers hum for two main reasons: stray magnetic fields and magnetostriction. More and more I see home inspectors doing troubleshooting when they are not trained to do so nor should they unless they are qualified in that discipline. for 60 cycles per second supply frequency, the noise or vibration is moving at 120 cycles per second. Guessing at causes is just that…guessing. ; so loud in fact that two people can not hear each other speak in the same room. Nothing more can be considered. We had a similar problem on an existing transformer and it was recommended that we install isolation pads on the transformer feet. If this transformer was examined when most of the people on that floor were away at work, I wouldn’t necessarily expect it to look very interesting. It's driving the teachers/ kids nuts. Our shop pretty much uses Square D exclusively, unless otherwise specified. So would I. The basic cause of transformer noise is magnetostriction: the expansion and contraction of the iron core (laminations) due to the magnetic effect of alternation current flowing through the transformer coils. You said all measurements are good but what did you measure? Common reasons for excessive transformer humming include, but are not limited to: In order to help ensure transformer integrity, it would be advisable to have the transformer electrically tested in accordance with NFPA 70B and The National Electrical Testing Association (NETA) Maintenance Testing Specification. The main cause of noise can usually be found in the LED driver of the lamp. Thanks. So if the noise can actually come out of the speaker, it makes me think quite strongly of several other causes that can be quite likely, probably more likely, than a problem with the transformer. For instance, a panel that contained a lot of baseboard electric heating breakers, when examined with an IR camera in the summer, may show nothing of note. The amount of noise is generally fixed by the design of the transformer. 4. that run around 185F most of the time. All transformers hum some, but there are at least 2-3 causes for abnormal, very load humming in dry type transofrmers - 1) insecure mouting to a resonant surface, 2) particularly in humid locations, the build-up of rust or other corrosion between the core laminations which causes noise when they vibrate against each other and 3) loose laminations caused by poor … (Except on... Use flexible conduit and bus connections. In most countries the transformer operates on 60 Hz or 50 Hz system frequencies. Come join the discussion about trade knowledge, tools, certifications, wiring, builds, scales, reviews, accessories, classifieds, and more! Some whom I know ARE certified, trained and have vast experience in one or more trades and they wouldn’t dream of treading into those areas while doing an inspection. The old one’s hum pretty loud. The 60Hz electrical current passing through it causes it to flex slightly and vibrate at that frequency, a phenomenon scientists call "magnetostriction." If I can, I'll remove the core & coils from the case, but be careful. The air inlet box and the exhaust box are further communicated with the outside of the outer wall body. This is always a problem and we can only work with what we are offered. It’s a fact of life that an electronic transformer will make a buzzing noise. Didn't help much. This panel could still have a trashed bus behind all the heating breakers. I had two of my electricians open for me today; we turned it back on (covers off). I have gone through testing various possibilities; Electric being the first - switch power off at circuit and still hear it. Mark If, as an electrician, I was called to look at a humming transformer, I really only have one choice. This produces an audible hum. During a September hearing, the power company argued that the backyard transformer’s noise level was within the normal range, about 45 decibels. If someone ever ends up in court the easiest way I know of to defuse an issue is to tell the court, “I am not qualified to make that determination and I told the customer that at the time of the inspection. Recommend replacing it. I've had good luck with motor shops as well. This is what baseline info gathering is all about. Mains hum can occur in the home around large appliances with motors that click on and off, such as refrigerators. Slightly cheaper than an online UPS, but absolutely effective against all kinds of line noise is an isolation transformer. "If the doors of perception were … This is where the dimensions of ferromagnetic materials change upon contact with a magnetic field. I have made a lot of $$$$ changing humming transformers and contactors. Replace the transformer, add rubber washers under it to isolate it from transmitting vibrations to the chassis that acts as a resonance box, just make sure that you restore the electrical connection between the transformer and the chassis, most of the time the screw holding the transformer will suffice, check for continuity, if there no continuity between …

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