US 12,482,600 B2
Method for manufacturing pole-mounted transformer using no insulation oil and pole-mounted transformer manufactured using same
Jong Tae Park, Seoul (KR)
Assigned to CHERYONG ELECTRIC CO., LTD., Seoul (KR)
Appl. No. 17/922,630
Filed by CHERYONG ELECTRIC CO., LTD., Seoul (KR)
PCT Filed Sep. 23, 2020, PCT No. PCT/KR2020/012864
§ 371(c)(1), (2) Date Nov. 1, 2022,
PCT Pub. No. WO2021/225232, PCT Pub. Date Nov. 11, 2021.
Claims priority of application No. 10-2020-0053150 (KR), filed on May 4, 2020.
Prior Publication US 2023/0215625 A1, Jul. 6, 2023
Int. Cl. H01F 7/06 (2006.01); H01F 27/24 (2006.01); H01F 27/32 (2006.01); H01F 41/06 (2016.01); H01F 41/12 (2006.01)
CPC H01F 41/06 (2013.01) [H01F 27/24 (2013.01); H01F 27/32 (2013.01); H01F 41/12 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for manufacturing a pole-mounted transformer using no insulation oil, comprising:
producing a first coil part by winding a low-voltage coil and a high-voltage coil;
performing casting by putting the first coil part into a mold and injecting a cast insulating material in a liquid state or a gel state into the mold to surround an outer circumferential portion of the first coil part while filling empty spaces in the first coil part, so as to produce a second coil part;
attaching a conductive material to an outer circumferential surface of the second coil part, so as to produce a third coil part;
coupling an iron core to the third coil part; and
completing manufacture of a pole-mounted transformer product by inserting the third coil part having the iron core coupled thereto into an outer case;
wherein, when the low-voltage coil is wound, a low-voltage side conductor and a rubber-based solid insulating material formed of a polymer having Shore hardness of 25-75 and elongation of 200-300% are wound together;
wherein, in the producing the first coil part, a conductive member having a surface resistance value of 3,000-8,000 Ω/square is interposed between the low-voltage coil and the high-voltage coil;
wherein the cast insulating material comprises 50-68 wt¾ of silicon dioxide or calcium silicate based on a total weight of the cast insulating material (100 wt¾);
wherein the conductive material has a surface resistance value of 2,000-8,000 Ω/square;
wherein after the third coil part having the iron core coupled thereto is inserted into the outer case, an empty space within the outer case is filled with a polymer-based insulating material having thermal conductivity of 0.5 W/mK or more, Shore hardness of 30-70, viscosity of 3,000 mPa-s or less, and is sealed.