Noise/vibration reduction device for transformers
A noise/vibration reduction device for transformers mounts on an inner surface of a tank side wall of a transformer tank having an internal space, the tank side wall defining an exterior of the tank. The device includes multiple through hole plates on the tank side wall and multiple support members located between adjacent plates and between one plate and the tank side wall. The support members separate the plates to define spaces including a first space between a first and second plate, a second space between the second and third plate, and a third space between the third plate and the tank side wall. The plates include first, second, and third through hole plates having corresponding through holes with different specifications, including different hole diameters, hole lengths, and distances between adjacent holes for different noise frequencies.
1 . A noise/vibration reduction device used in a transformer including a tank having an internal space and a tank side wall defining an exterior of the tank, comprising: a plurality of through hole plates installed on the tank side wall, each of the plurality of through hole plates having at least one through hole disposed therein; and a plurality of support members positioned between adjacent ones of the plurality of through hole plates and between one of the plurality of through hole plates and the tank side wall to define a plurality of spaces including a first space, a second space and a third space between the adjacent ones of the plurality of through hole plates and between the one of the plurality of through hole plates and the tank side wall, wherein each of the plurality of through hole plates has different specifications of the through holes disposed therein to reduce noises having different frequencies, wherein the plurality of through hole plates include a first through hole plate having at least one first through hole disposed therein, a second through hole plate having at least one second through hole disposed therein, and a third through hole plate having at least one third through hole disposed therein, and wherein a plurality of first support members are positioned between the first through hole plate and the second through hole plate to define the first space, a plurality of second support members are positioned between the second through hole plate and the third through hole plate to define the second space, and a plurality of third support members are positioned between the third through hole plate and the tank side wall to define the third space.
2 . The noise/vibration reduction device of claim 1 , wherein the at least one through hole disposed in each of the plurality of through hole plates have different diameters, lengths, and distances between adjacent through holes, thereby varying the frequency reduced.
3 . The noise/vibration reduction device of claim 1 , wherein the plurality of through hole plates and the plurality of support members are made of an insulating material.
4 . The noise/vibration reduction device of claim 3 , wherein the through hole plates and the support members are press boards manufactured by overlapping, drying, and pressing a thin wet sheet made from plant fiber as a raw material.
5 . The noise/vibration reduction device of claim 1 , wherein a through hole is formed by penetrating the first to third through hole plates and the first to third support members,
wherein a stud bolt installed on the tank side wall penetrates the through hole, and a disk nut is fastened to the stud bolt so that a contact disk is in contact with the front surface of the first through hole plate.
6 . The noise/vibration reduction device of claim 5 , wherein the disk nut is made of an insulating material.