Underground distribution cable connecting device with leakage-proof function

Abstract

The invention provides an underground distribution cable connecting device with a leakage-proof function. According to the embodiment of the invention, the underground distribution line connecting device comprises a connecting terminal for electrically connecting a pair of underground distribution lines laid in the ground, a terminal shell for accommodating the connecting terminal to prevent electric shock, and a connecting terminal arranged in the terminal shell. And a joint support portion supporting the terminal housing on the ground and having an engageable joint support by means of a leakage inductor that detects leakage to the ground distribution line, the joint being activated at the joint of the terminal housing when the leakage inductor is induced, and the leakage inductor being activated at the joint of the joint. And an epoxy injector that injects an insulating epoxy into the terminal housing when the joint bracket is folded by the load of the terminal housing as the branch part detects an electric leakage.

Description

Technical Field

[0001] This invention relates to an underground power distribution line connection device for electrically connecting underground power distribution lines. Background Technology

[0002] Generally, underground power distribution lines are laid in underground pipelines. Depending on the length of the underground power distribution lines, multiple underground power distribution lines are electrically connected and laid through connecting devices.

[0003] For the purpose of electrically connecting underground power distribution lines, the underground power distribution line connection device was initiated in Korean Patent Registration No. 10-2005518 (announced on October 1, 2019) as "protective connection device structure for underground power distribution lines".

[0004] The aforementioned protective connection device structure for traditional underground power distribution lines includes: a multi-layer frame installed on the inner walls of both sides of the underground tunnel; a tray fixed to the top of the lathe; the left and right underground power distribution lines supported on the tray; an interface connecting the left and right underground power distribution networks; a power distribution tightening port that connects to the left and right underground power distribution lines at a certain distance; a connection port support means that elastically supports the connection port on the tray; and a power distribution support means that elastically supports the power distribution fasteners on the tray.

[0005] This traditional protective wiring device structure for underground power distribution lines effectively absorbs and reduces external vibrations and impacts transmitted to the underground power distribution lines and wiring points while electrical wiring is being performed. It prevents poor wiring or arcing at the wiring points, damage to surrounding underground power distribution lines by arcing, insulation failure, the generation of cascading arcs, and power outages and fires caused by these issues, thus fully ensuring the insulation of the wiring points of the underground power distribution lines.

[0006] However, the traditional underground power distribution line protective connection device structure connects the power distribution line to the crimped bushing. Combined with the upper and lower insulating half bushings, and with the upper and lower half bushings of the connection port wrapped together, leakage at the connection point can be prevented.

[0007] However, when abnormalities occur at the connection points of the protective wiring devices used in traditional underground power distribution lines, the entire wiring part needs to be disassembled, which is not only difficult to maintain, but also poses problems such as leakage due to moisture penetration and difficulty in handling leakage. Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] The present invention is proposed to solve the above-mentioned problems. The problem to be solved by the present invention is to provide an underground power distribution line connection device with leakage protection function. Its purpose is to house the connection terminal in the terminal housing. The connection terminal can be seen by opening the terminal housing, so the connection terminal can be easily maintained.

[0010] Furthermore, the purpose of this invention is to provide an underground power distribution line connection device. If a leakage current sensor detects a leakage current, epoxy can be injected into the terminal housing through an epoxy injector to prevent leakage current and thus prevent electrical accidents.

[0011] Furthermore, the purpose of this invention is to provide an underground power distribution cable connection device that, when injecting cyclohexane into a single subspace, reduces the resistance caused by the injection of cyclohexane by releasing the internal air of the single subspace through the release port, thereby enabling rapid and convenient injection of cyclohexane.

[0012] In addition, the purpose of this invention is to provide a grounding power distribution connection device that minimizes the power consumed in injecting epoxy when leakage occurs, as the joint bracket supporting the terminal housing is connected to the ground.

[0013] Furthermore, the purpose of this invention is to provide an underground power distribution line connection device that, by restricting the rotation direction of a rotatable joint bracket, allows the joint bracket to rotate under the load of the terminal sleeve, thereby preventing the terminal sleeve from conducting electricity.

[0014] Means used to solve problems

[0015] To accomplish the above tasks, according to an embodiment of the present invention, the underground power distribution cable connection device refers to a connection terminal that electrically connects a pair of underground power distribution cables laid underground, a terminal housing that houses the connection terminal to prevent electric shock, a leakage current sensing bracket that detects leakage current flowing to the two underground power distribution cables through the connection terminal located inside the terminal housing, and a bracket supported on the terminal housing and having an engaging iron joint. When the terminal housing is activated, if leakage current is sensed on the terminal housing, the joint is activated at the connector, and the leakage current sensed on the joint is detected at the connector. Because of its location, leakage current is detected on the leakage current sensor, and when the joint bracket is folded, it is subjected to a load pressure from the terminal housing. An epoxy injector is included to inject insulating epoxy into the interior of the terminal housing.

[0016] The terminal bushing may include an outlet for releasing air from the interior of the terminal bushing during epoxy injection, thereby facilitating the injection of the epoxy and releasing air from the interior of the terminal bushing, and an outlet sleeve covering the upper part of the outlet to block the inflow of foreign matter through the outlet.

[0017] The epoxy casting device may include a piston pressure rod mounted on the epoxy-receiving casting cylinder and the lower part of the casting cylinder. When the joint bracket is folded, it is supported on the ground and pressurized under the load of the terminal housing to push the epoxy filled in the casting cylinder into the terminal housing.

[0018] Located at the end of the joint support, and with respect to the direction in which the joint support is folded, a conductive support may be included to prevent the joint support from folding in the opposite direction, thereby preventing the joint support from tilting when it is unfolded.

[0019] Effects of the Invention

[0020] According to the present invention, before leakage occurs, the connection terminals accepted on the terminal housing can be immediately seen by opening the terminal housing, making maintenance convenient.

[0021] Furthermore, in the event of leakage in the leakage current sensor, the present invention can inject cyclohexanone into the terminal space through a cyclohexanone injector to treat the leakage current and prevent electrical accidents caused by leakage.

[0022] Furthermore, in this invention, when injecting cyclohexane, the air filled into the terminal space is released outward through the release port, and cyclohexane is injected, thus reducing the resistance caused by cyclohexane injection and making cyclohexane injection convenient.

[0023] In addition, after the joint support is folded by the joint activation mechanism, the epoxy injector is supported on the ground. Epoxy is injected into the terminal space by pressurizing the epoxy injector through the load of the terminal housing. Therefore, the epoxy injector can be pressurized, minimizing the power required to inject epoxy. Attached Figure Description

[0024] Figure 1 According to an embodiment of the present invention, four views of an underground power distribution line connection device with leakage protection function are shown, indicating that one side of the terminal housing has been cut off.

[0025] Figure 2 This is a cross-sectional view of an underground power distribution line connection device with leakage protection function according to an embodiment of the present invention.

[0026] Figure 3 This is a cross-sectional view of an underground power distribution line connection device with leakage protection function according to an embodiment of the present invention, and a drawing showing the operation of the joint start mechanism according to the leakage occurrence.

[0027] Figure 4This is a cross-sectional view of an underground power distribution line connection device with leakage protection function according to an embodiment of the present invention, showing the state of epoxy being injected into the terminal housing by an epoxy injector.

[0028] Explanation of reference numerals in the attached figures

[0029] 100: Power distribution line connection device with leakage protection function

[0030] 110: Connecting terminal; 120: Terminal housing

[0031] 121: Terminal space; 123: Sensor space

[0032] 125: Export 127: Export Cover Plate

[0033] 130: Joint support; 131: Joint portion

[0034] 135: Conductive part; 140: Epoxy injector

[0035] 141: Casting cylinder; 141a: Sprue

[0036] 141b: Injection cap; 143: Piston

[0037] 145: Piston pressure rod; 150: Joint starting mechanism

[0038] 151: Plunger; 160: Leakage Detection Unit

[0039] 161: Leakage current sensor; 200: Underground power distribution cable Detailed Implementation

[0040] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0041] According to an embodiment of the present invention, an underground power distribution line connection device 100 with leakage protection function can electrically connect a pair of series-connected underground power distribution lines 200 deployed underground.

[0042] like Figures 1 to 4 As shown, the ground distribution wire connection device 100 with the function of preventing leakage current according to the embodiment of the present invention can be electrically connected to each other by inserting the exposed core wires at the ends of a pair of opposing ground distribution wires 200 into the conductor connection end 110.

[0043] The connecting terminal 110 can be formed into a cylindrical shape so that core wires can be inserted into both sides for connection.

[0044] Terminal 110 can be protected by terminal sleeve 120, which can form a conductor to prevent electric shock from direct contact with terminal 110.

[0045] A terminal space 121 for inserting a connecting terminal 110 can be formed in the center of the terminal housing 120. The connecting terminal 110 can be located in the center of the terminal space 121 so that a space is formed around the connecting terminal 110.

[0046] On the terminal housing 120, the two sides of the connecting terminal 110 can be divided in the partition wall to form a sensor space 123 for installing the leakage current sensing sensor.

[0047] The sensor space 123 and the terminal space 121 are divided into the terminal space 121. When cyclohexane is injected into the terminal space 121, the sensor space 123 prevents cyclohexane from penetrating, which can prevent the leakage sensor 161 from being locked by cyclohexane and losing its function.

[0048] Additionally, in the upper part of the terminal housing 120 corresponding to the terminal space 121, in order to improve the injection performance of epoxy when epoxy is injected into the terminal housing 120 from the epoxy injector 140, an outlet 125 may be formed to release the air inside the terminal housing 120 to the outside. The material inside the terminal housing 127 can be injected into the terminal housing 120 through the outlet 125 above the outlet 125.

[0049] The release mask 127 does not completely seal the release port 125, but rather covers the upper part of the release port 125 by transferring foreign objects to the upper part of the release port 125 to prevent foreign objects from entering.

[0050] The terminal housing 120 is in the form of two parts, one on the top and one on the bottom, or one on the left and one on the right, which can be inserted and positioned when the terminal 110 is connected.

[0051] Terminal sheath 120 can form a leakage current sensor 160 for detecting leakage current on a pair of grounded cables and connecting terminals 110. The leakage current sensor 160 can activate joint 150 when the leakage current value detected by the leakage current sensor 161 is greater than a preset leakage current value, so as to determine that leakage current has occurred and to handle the leakage current.

[0052] At this time, leakage current sensors 161 can be installed on a pair of underground power distribution lines respectively, and each leakage current sensor 161 is inserted into the sensor space 123 located on both sides of the terminal space 121 of the terminal housing 120.

[0053] The terminal sleeve 120 can be removed from the floor and positioned by the joint bracket 130, which can be unfolded or folded in such a way that one end and the striking end rotate around the joint portion 131.

[0054] The articulated brackets 130 can be mounted on the terminal sleeve 120 in pairs, spaced apart in the form of plates or rods. When the pair of articulated brackets 130 are in opposite directions, the joint 131 protrudes and folds in a rotating manner, which may result in the loss of the supporting force on the terminal sleeve 120.

[0055] An epoxy injector 140 can be installed between a pair of joint supports 130 to inject epoxy into the terminal space 121 to prevent leakage in the event of a leakage.

[0056] One end of each joint bracket 130 is mounted on a housing bracket on a terminal housing 120, and is rotatably joined together on the housing bracket. The striking end of the joint bracket 130 is mounted on a bottom bracket, and is rotatably joined together on the bottom bracket.

[0057] The joint bracket 130 can form a transmission branch 135 at both ends of each joint bracket 130 to restrict the rotation of the joint bracket 130, so as to prevent the terminal sleeve 120 from tilting and transmitting when the joint bracket 130 rotates in the open state, due to the rotation of the rotatable sleeve bracket and the base frame.

[0058] When the joint bracket 130 is pressurized under the load of the terminal housing 120, in order to prevent it from easily opening outward, the angle between the opposite directions of the two joint brackets 130 facing the joint portion 131 can be less than 180°.

[0059] The conduction damper 135 can restrict the two ends of the joint bracket 130 from rotating in opposite directions, so that the joint bracket 130 is rotatably joined together, with the two ends protruding from the part where they are located, and only allows rotation to the opposite direction outwards in the opposite direction of the joint bracket 130, thus restricting rotation in opposite directions.

[0060] The conductive damper 135 can also be formed on the sheath support and base.

[0061] The epoxy casting machine 140 can consist of a casting cylinder 141 filled with epoxy and a piston pressure rod 145 that pressurizes the epoxy in the casting cylinder 141 onto the casting cylinder 141 and pushes it out.

[0062] Here, cyclohexane can be in a liquid state, or in a hardened form when cyclohexane is exposed to the outside, where the volatile components evaporate.

[0063] The epoxy casting machine 140 is connected to the lower part of the terminal housing 120. The gate 141a of the casting cylinder 141 can penetrate the terminal housing 120 and is located in the terminal space 121. A piston 143 for pressurizing and filling epoxy is installed inside the casting cylinder 141 in the opposite direction to the gate 141a. The piston 143 is pressurized by the piston 143.

[0064] The top of the piston pressure rod 145 can be fitted with a piston 143 that is inserted into the casting cylinder 141. With the connection of the joint bracket 130, if the support force is lost, under the load of the terminal housing 120, the piston pressure rod 145 is supported at the bottom and pressurized. When the gas is filled into the casting cylinder 141, it can be injected into the terminal 121 through the casting 141a.

[0065] At this time, the pouring cover 141b of the sealing pouring cylinder 141b can be installed on the gate 141a to prevent the volatile epoxy components filled in the pouring cylinder 141 from volatilizing and hardening. Under the load of the terminal housing 120, the pouring cover 141b is supported at the bottom by the piston pressure rod 145. The piston 141 inside the pouring cylinder 141b is relieved by the pressure 141 of the pouring cylinder 141b, thereby reducing the internal pressure of the pouring cylinder 141b to the internal pressure of the pouring cylinder 141. This eliminates the piston 121 inside the pouring cylinder (141b) by the pouring pressure 141, allowing the internal pressure of the pouring cylinder 141b to be injected into the pouring cylinder 121.

[0066] Furthermore, when the lower end of the piston pressure rod 145 is removed from the ground with the joint bracket 130 open, no load is applied to the terminal sleeve 120. When the joint bracket 130 is engaged, the piston pressure rod 145 may be pressurized by the load of the terminal sleeve 120 when it contacts the ground.

[0067] Additionally, a joint start mechanism 150 can be provided on the epoxy injection molding machine 140 to press the joint portion 131 of the joint bracket 130 to the outside, so that it is controlled by the leakage current sensor 160 of the joint bracket 130. As the joint bracket 130 is connected to the ground, the joint bracket 130 loses the support force of the joint bracket 130.

[0068] The joint activation mechanism 150 can be mounted on the outer surface of the epoxy injector 140 in a pair of opposing directions to pressurize the joint portion 131 of each joint bracket 130. The joint activation mechanism 150 can be activated by an electromagnetic mechanism that extends upon insertion of the trigger 151 after power is supplied.

[0069] Explain the roles and effects of the above components.

[0070] According to an embodiment of the present invention, when a pair of underground cables are connected to the connection terminal 110, the underground power distribution cable connection device 100 with leakage protection function is inserted into the connection terminal 110 and installed in the terminal space 121 of the terminal housing 120, and a leakage current sensor 161 for detecting leakage current of the underground cable connected to the connection terminal 110 is inserted into the sensor space 123 of the terminal housing 120.

[0071] The terminal housing 120 will form an outlet 125 for releasing air from inside the terminal space 121 to the outside, and an outlet 125 will be fitted with an outlet mask 127 to prevent foreign matter from entering.

[0072] The terminal sheath 120 can be detached from the ground by a pair of separate articulated supports 130, which can be rotated and folded or unfolded at both ends with the joint portion 131 as the center.

[0073] The joint bracket 130 supports the terminal housing 120 in an unfolded state, and the upper and lower parts of the joint bracket 130 can be rotated and connected on the housing bracket and the bottom bracket.

[0074] On the other hand, the upper and lower ends of each joint bracket 130 can rotate outward, but a pair of joint brackets 130 can be supported by conductive supports 135, so that the joint brackets 130 can rotate in opposite directions to prevent the terminal sleeve 120 from conducting.

[0075] An epoxy injector 140 is provided between a pair of joint supports 130 to inject ethylene oxide into the connection terminal 110 in case of leakage. The ethylene oxide injector 140 is connected to the terminal space 121. The lower part of the injector 141 is provided with a pressurizing terminal 145 for filling the cylinder 141 with ethylene oxide, thereby pressurizing it onto 121.

[0076] With the joint bracket 130 supporting the terminal sleeve 120, the piston pressure rod 145 is positioned off the ground. After the joint bracket 130 is connected to the ground, the piston pressure rod 145 contacts the ground and applies pressure to the piston 143 according to the load of the terminal sleeve 120.

[0077] Then, on the epoxy injection molding machine 140, each joint portion 131 of a pair of joint supports 130 is pushed outward, and a joint activation mechanism 150 is set to connect the joints of the pressure joint supports 130. According to the operation of the leakage current sensor 160, as the trigger 151 protrudes, the joint activation mechanism 150 presses the joint portion 131 in the opposite direction to the pair of joint supports 130.

[0078] According to the above-described embodiment of the present invention, when the terminal bracket is open and the terminal housing 120 is supported, if the leakage current value measured by the leakage current sensor 161 exceeds the preset leakage current, the leakage current sensor 160 activates the joint activation mechanism 150.

[0079] like Figure 3 As shown, if the joint activation mechanism 150 is working, each pin 151 will protrude, pressurizing the joint portion 131 of the corresponding joint support 130.

[0080] After the joint portion 131 is pressurized, the joint portion 131 unfolds outwards in opposite directions to the direction facing the pair of joint supports 130, and the joint supports 130 rotate and fold.

[0081] After the joint bracket 130 is folded, the piston pressure rod 145 of the epoxy casting machine 140 is supported on the ground, the load of the terminal housing 120 is transferred to the epoxy casting machine 140, and the epoxy injection cylinder 141 descends after being pressurized on the piston pressure rod 145.

[0082] like Figure 4 As shown, if the injection cylinder 141 is lowered from the piston pressure rod 145, the piston 143 will increase the pressure resistance of the injection cylinder 141, open the sprue 141a of the ceramic pot, and the epoxy resin filled inside the injection cylinder 141 will be injected into the terminal space 121 of the terminal housing 120.

[0083] At this time, the air charged into the terminal space 121 is released outward through the outlet 125, and epoxy resin can be conveniently injected into the terminal space 121.

[0084] In addition, if all the cyclohexane filled in the injection cylinder 141 is injected into the terminal space 121, the volatile components contained in the cyclohexane will evaporate, and the cyclohexane will harden, covering the connection portion of the connection terminal 110 and the ground cable located in the terminal space 121, thereby preventing the generation of leakage current.

[0085] If the grounding wire 200 and the connection terminal 110 connected to the grounding wire are insulated with epoxy resin beforehand, the cured epoxy resin must be removed when replacing or repairing the connection terminal 110. Therefore, the present invention only uses epoxy resin to treat the connection part when leakage current occurs. Thus, the connection terminal 110 can be easily maintained before leakage current occurs and it is treated with epoxy resin.

[0086] Therefore, according to an embodiment of the present invention, when a leakage current occurs at the connection end 110, the underground power distribution line connection device 100 with leakage protection function can prevent the generation of leakage current through epoxy insulation, thereby preventing the occurrence of electrical accidents caused by leakage current.

[0087] Furthermore, the present invention can only perform epoxy treatment on the connection end 110 by the epoxy injector 140 when the leakage current sensor 160 detects leakage current, so the connection end 110 can be easily maintained before leakage current occurs.

[0088] Furthermore, when leakage current is detected on the leakage current sensor 160, the present invention activates the joint activation mechanism 150 to pressurize the epoxy injector 140 under the load of the terminal housing 120 and inject epoxy, thereby minimizing the power required for epoxy injection and reducing power consumption.

[0089] In addition, when cyclohexane is injected into the terminal space 121, the air that is filled inside will be released to the discharge port 125 along with the filling of cyclohexane, so cyclohexane can be conveniently injected into the terminal space 121.

[0090] Furthermore, the present invention also restricts the rotatable joint ends of the joint bracket 130 to unidirectional rotation by means of conductive support 135, thereby preventing the terminal housing 120 supported on the joint bracket 130 from becoming conductive as the rotatable joint bracket 130 rotates.

[0091] The embodiments of the present invention have been described above, but the scope of the present invention is not limited thereto, and includes all changes and modifications in the technical field to which the present invention pertains that are easily altered by a person with ordinary knowledge and are considered to be of equal scope.

Claims

1. A leak-proof underground power distribution cable connection device, characterized in that, The underground power distribution cable connection device with leakage prevention function includes: Electrical connection terminals for connecting a pair of underground power distribution lines laid underground; The connection terminal is housed within a terminal housing for the connection terminal. A leakage current sensor can detect leakage current flowing to the pair of ground distribution lines through the connection terminal located inside the aforementioned terminal housing. The terminal housing is supported on the ground and has a joint bracket with a foldable joint. When leakage current is detected in the leakage current sensor, the joint actuation mechanism of the joint is activated to fold the joint support; and Located at the lower part of the terminal housing, when the joint bracket is folded as the leakage current sensor detects leakage, it is pressurized by the load of the terminal housing, and the interior of the terminal housing is injected with cyclohexane for insulation.

2. The underground power distribution cable connection device with anti-leakage function according to claim 1, characterized in that, The terminal housing includes: When epoxy is injected into the interior of the terminal housing through the release port, the internal air of the terminal housing is released outwards, facilitating the injection of the epoxy; and The upper part of the release port is covered to prevent foreign objects from flowing into the release port.

3. The underground power distribution cable connection device with anti-leakage function according to claim 1, characterized in that, The epoxy injector includes: A casting cylinder capable of accommodating the epoxy resin; and A piston pressure rod, installed at the lower part of the casting cylinder, is supported on the ground when the joint bracket is folded. The load of the terminal housing applies pressure to push the cyclohexane filled in the casting cylinder into the terminal housing.

4. The underground power distribution cable connection device with anti-leakage function according to claim 1, characterized in that, The underground power distribution cable connection device with leakage prevention function includes a conductive branch located at the end of the joint bracket. This conductive branch prevents the joint bracket from folding in the opposite direction to the folding direction of the joint bracket, thereby preventing the joint bracket from tilting when it is unfolded.

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