Table of Contents
Why do substations hum?
Electric hum around transformers is caused by stray magnetic fields causing the enclosure and accessories to vibrate. Magnetostriction is a second source of vibration, in which the core iron changes shape minutely when exposed to magnetic fields. Around high-voltage power lines, hum may be produced by corona discharge.
How loud are substations?
The noise level of a substation power transformer is a function of the MVA and BIL rating of the high voltage winding. These transformers typically generate a noise level ranging from 60 to 80 dBA.
Why does one hear a hum when standing close to a large transformer?
If you stand near a transformer, the humming sound that you hear is due to the magnetostriction effect that exists in the core of the transformer. In case you hear a buzzing sound while standing beneath a power transmission line or over head lines, is due to the corona effect.
What is 60Hz hum?
60 cycle hum is a phenomenon that is caused from your wall main power. Typically, alternating current that is found in most power lines has a frequency of 60hz. For the single coil lover, you are battling electromagnetic frequency interference (EMI) and Radio Frequency Interference (RFI) from the world around you.
Are substations safe?
Some EMFs naturally occur in the environment and we’re exposed to these every day. However, EMFs emitted by pylons and substations can raise the risk of developing health problems when placed close to people and buildings. Health issues may include: Different types of cancer (or an increased risk of cancer)
How do you stop a transformer from buzzing?
Covering the walls of the transformer room with absorbent materials such as kimsul, acoustical tile or fiberglass may help keep the noise contained. Use Oil Barriers or Cushion PaddingLike sound dampening materials, oil barriers and cushion padding may also help insulate transformer noise and prevent it from spreading.