Overhead transmission lines BUZZING
Overhead transmission lines BUZZING
(OP)
I just started working at an industrial plant and every morning I walk underneath some large open wire, 3-phase lines that buzz fairly loudly considering they are in the air 50' or so. I think they are 15kV. They are on transmission towers, and look like about 500 kcmil ACSR open conductor on porcelain insulators.
What is the buzzing? And is this a symptom of anything? Is there anything that can be done about it?
What is the buzzing? And is this a symptom of anything? Is there anything that can be done about it?






RE: Overhead transmission lines BUZZING
RE: Overhead transmission lines BUZZING
RE: Overhead transmission lines BUZZING
RE: Overhead transmission lines BUZZING
Above 230, audible buzzing seems to be common.
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: Overhead transmission lines BUZZING
RE: Overhead transmission lines BUZZING
RE: Overhead transmission lines BUZZING
Seriously, I worked for years in substations and hydroelectric projects, and the buzzing is just part of the game.
FYI, 15kv is a common transmission line voltage after being stepped down at the main distribution substation, at least here.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Overhead transmission lines BUZZING
RE: Overhead transmission lines BUZZING
We have 512, 230, 115 feeding to the distribution subs and fed out at 26, 15 or 13, and 4 in the distribution system.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Overhead transmission lines BUZZING
RE: Overhead transmission lines BUZZING
RE: Overhead transmission lines BUZZING
Also, these open wires are paralleled 2 per phase. The paralleled conductors are very close to each other. Could this be the issue?
RE: Overhead transmission lines BUZZING
RE: Overhead transmission lines BUZZING
Multiple conductors per phase is common at transmission voltage ( > 69 kV). That should not be the source of the buzzing.
Yes, I'm wondering if this isn't 115 kV. Can you count the knobs on the insulators?
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: Overhead transmission lines BUZZING
At a height of 50' with an approximate pole spacing of 60m, you cannot judge the source of sound. It is, coming from the insulators but seems to you that its coming from midspan.
RE: Overhead transmission lines BUZZING