KR-20260067117-A - Oil leakage prevention apparatus for end-joint box of power cable

Abstract

The present invention relates to an accessory for a power cable terminal junction box, and more specifically, to an oil leakage prevention device for preventing oil leakage at the connection portion of the terminal junction box. The leakage prevention device for a power cable terminal connection box according to the present invention comprises: a cap having a cylindrical first body and a first screw tap formed on the inner surface of one end of the first body, with one end open and the other end closed, wherein the upper surface of the plate is connected to the screw tap of the screw tap that is connected by the screw tap of the first body with respect to the plate, and the first and second screw taps are connected to each other.

Inventors

• 최아름

Assignees

• 대한전선 주식회사

Dates

Publication Date

20260512

Application Date

20241105

Claims (6)

1. Based on the plate, on the upper surface of the plate, a pipe flange is coupled to the pipe fastening bolt, which is fastened by the pipe fastening bolt, and A cap covering the head portion of the above-mentioned bolt for fastening the duct, having a cylindrical first body and a first screw tap formed on the inner surface of one end of the first body, with one end open and the other end closed; A washer comprising a second body that is fitted into the threaded portion of the above-mentioned bolt for fastening the pipe and has a second thread tap on its outer surface in a cylindrical shape, and a flange integrally formed at the bottom of the second body; A leakage prevention device for a power cable terminal connection box, wherein the first and second screw taps are tapped together.
2. In paragraph 1, The tip of the first screw tap has a first O-ring fastening portion having an inclined surface formed thereon, and The portion where the second body and the flange meet is formed with an inwardly concave second O-ring fastening portion, and A leakage prevention device for a power cable terminal connection box, wherein when the above-mentioned cap and washer are combined, an O-ring is fitted and connected between the first O-ring fastening part and the second O-ring fastening part.
3. In paragraph 1, A leakage prevention device for a power cable terminal connection box, wherein an O-ring groove is formed on the lower surface of the above flange so that an O-ring can be inserted between it and the above plate.
4. In paragraph 1, A leak prevention device for a power cable terminal connection box, wherein an oil outlet hole capable of draining leaked oil to the outside is formed at the other end of the first body.
5. In paragraph 1, The above-mentioned cap and washer are made of a transparent material, and the leakage prevention device for a power cable terminal connection box.
6. Based on the plate, the lower copper pipe is fastened to the lower surface of the plate by a copper pipe fastening bolt, and A cap covering the head portion of the above-mentioned copper pipe fastening bolt, having a cylindrical first body and a first screw tap formed on the inner surface of one end of the first body, with one end open and the other end closed; A washer comprising a second body that is fitted into the threaded portion of the above-mentioned copper pipe fastening bolt and has a second thread tap on its outer surface in a cylindrical shape, and a flange integrally formed at the bottom of the second body; A leakage prevention device for a power cable terminal connection box, wherein the first and second screw taps are tapped together.

Description

Oil leakage prevention apparatus for end-joint box of power cable The present invention relates to an accessory for a power cable terminal junction box, and more specifically, to an oil leakage prevention device for preventing oil leakage at the connection portion of the terminal junction box. Outdoor terminal junction boxes are installed in the air as terminal devices that connect underground cables and overhead transmission lines. To maintain mechanical strength and electrical insulation performance, a magnetic or polymer tube is used for the exterior, and the interior is installed by filling it with a rubber stress cone and insulating oil to mitigate the electric field. This connection generally has a structure in which an insulator is connected to the upper part of a plate and a lower copper pipe for protecting the power cable is connected to the lower part, with the power cable being routed into the insulator and the lower copper pipe, and the insulator and the lower copper pipe being bolted to the plate. Recently, the problem of oil and compound leakage at the bolt connection points between the insulator and the plate, and between the plate and the lower copper pipe, has emerged, and measures to address this are becoming necessary. This is especially true for terminal junction boxes installed near rivers and beaches among outdoor installations. The interior of the terminal junction box is filled with insulating oils such as alkylbenzene, silicone, and polybutene oil to mitigate the electric field. This is designed to prevent leakage by using a rubber sealing device, such as an O-ring, on the plate at the bottom of the pipe, but oil leakage may occur due to damage to the sealing device or improper assembly, and in this case, the oil flows along the plate interface and through the bolt groove. Oil leaking through bolt grooves leaks unchecked into the external environment, causing environmental problems. FIG. 1 is an example assembly diagram of a terminal junction box to which a leakage prevention device for a power cable terminal junction box according to the present invention is applied. FIG. 2 is a first assembled enlarged view of a leakage prevention device for a power cable terminal connection box according to the present invention. FIG. 3 is a second enlarged view of the oil leakage prevention device for a power cable terminal connection box according to the present invention. FIG. 4 is a structural diagram of a leakage prevention device for a power cable terminal connection box according to the present invention. FIG. 5 is a diagram of the cap structure of a leakage prevention device for a power cable terminal connection box according to the present invention. FIG. 6 is a washer structure diagram of a leakage prevention device for a power cable terminal connection box according to the present invention. Hereinafter, the leakage prevention device for a power cable terminal connection box according to the present invention will be described in detail with reference to the drawings. The detailed description of specific embodiments illustrated in the attached drawings is to be read in conjunction with the accompanying drawings, and the drawings are considered to be part of the description of the entire invention. References to directions or orientations are for convenience of explanation only and are not intended to limit the scope of the invention in any way. It should be noted that when assigning reference numerals to the components of each drawing, the same components are assigned the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the present invention, if it is determined that a detailed description of related known components or functions could obscure the essence of the invention, such detailed description is omitted. FIG. 1 is an example assembly diagram of a terminal junction box to which a leakage prevention device for a power cable terminal junction box according to the present invention is applied. As illustrated in FIG. 1, the power cable termination box according to the present invention may comprise a conduit (110), a plate (130), and a lower copper pipe (140), and a power cable (not shown) may pass through the center of the interior and stand upright, and various insulation reinforcing parts and mechanical supports may be installed on the power cable. The insulator (110) is a tube-shaped device that serves to insulate and support the power cable. It may be made of ceramic or silicone material, but is not limited thereto. Any material that can maintain an appropriate level of strength while having insulation strength is sufficient. The outer surface of the insulator (110) may have a plurality of cap-shaped protrusions (not shown) formed to increase the insulation leakage distance. Additionally, oil (170) is filled inside to reinforce the insulation breakdown strength, and a stress cone (not shown) may be connected to all