Underwater motor leakage current limiting capture net

Abstract

To provide an underwater motor leakage current limiting capture net that can limit a leakage current leaking from phase voltage lines R, S, and T of a three-phase power cable connected to an underwater motor from entering the human body by expanding the area of a neutral wire of the three-phase power cable that supplies power to the underwater motor.SOLUTION: The present invention relates to an underwater motor leakage current limiting capture net, which prevents electric shock accidents by expanding the area of the neutral wire of a three-phase power cable that supplies power to an underwater motor and limiting the leakage current leaking from the phase voltage lines R, S, and T of the three-phase power cable connected to the underwater motor from entering the human body.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to leakage current limiting technology, and more particularly to a capture net for limiting leakage current in submersible motors. [Background technology]

[0002] Underwater motors are used in places such as immersion tanks, which collect water that flows in from a drain and is discharged into a septic tank or collection well, and settle foreign matter.

[0003] However, in the past, there was no function to limit the leakage current leaking from the phase voltage lines R, S, and T of the three-phase power cable that supplies power to underwater motors used in submersible tanks, etc., which meant that there was a problem of electric shock occurring when a human body came into contact with water through which current leaked from the underwater motor.

[0004] In Korean Patent Registration No. 10-1404806 (May 30, 2014), which was previously filed and registered by the applicant of the present invention, a power circuit breaker with an electric shock prevention function was proposed, which connects a flat conductor with a cross-sectional area larger than the cross-sectional area of ​​the wire to an output terminal connected to the power transmission and distribution path of the electrical equipment, thereby reducing the current flowing to the body of a person who comes into contact with leaked electricity and preventing electric shock.

[0005] This technology prevents electric shock by limiting leakage current using the area difference between conductor electrodes, and the inventor has researched a technology that can prevent electric shock to humans by applying this technology that limits leakage current using the area difference between conductor electrodes to an underwater motor. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Patent No. 10-1404806 (Announced 2014.06.12) Summary of the Invention [Problem to be solved by the invention]

[0007] The object of the present invention is to provide an underwater motor leakage current limiting capture net that can expand the area of ​​the neutral wire of the three-phase power cable that supplies power to the underwater motor, and limit the leakage current leaking from the phase voltage lines R, S, and T of the three-phase power cable connected to the underwater motor from entering the human body. [Means for solving the problem]

[0008] According to one aspect of the present invention to achieve the above-mentioned object, a leakage current limiting capture net for an underwater motor includes a cylindrical body made of a conductive material in which an underwater motor is housed, and the neutral conductor N of the three-phase power cable connected to the underwater motor is connected to its inner surface to expand the area of ​​the neutral conductor N and thereby capture leakage current leaking from the phase voltage conductors R, S, and T of the three-phase power cable connected to the underwater motor, and a grounding part attached to the outer surface of the cylindrical body made of a conductive material and connected to the ground G.

[0009] According to an additional aspect of the present invention, the tubular body of conductive material may be embodied in a cylindrical shape.

[0010] According to an additional aspect of the present invention, the cylindrical body made of a conductive material may be embodied in the shape of a polygonal tube. [Effects of the Invention]

[0011] The present invention has the effect of preventing electric shock accidents to humans by expanding the area of ​​the neutral wire of the three-phase power cable that supplies power to the submersible motor, thereby limiting the leakage current that leaks from the phase voltage lines R, S, and T of the three-phase power cable connected to the submersible motor and flows into the human body. [Brief explanation of the drawings]

[0012] [Figure 1]1 is a side cross-sectional view showing one embodiment of an underwater motor leakage current limiting capture net according to the present invention. FIG. [Figure 2] 1 is a plan cross-sectional view showing an embodiment of a cylindrical body of an underwater motor leakage current limiting capture net according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to preferred embodiments thereof, with reference to the accompanying drawings, so that those skilled in the art can easily understand and reproduce the present invention. Although specific embodiments are shown in the drawings and related detailed descriptions are provided, this is not intended to limit the various embodiments of the present invention to the specific forms.

[0014] In describing the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the gist of the embodiments of the present invention, such detailed description will be omitted.

[0015] When a component is referred to as being "coupled" or "connected" to another component, it may be directly coupled or connected to the other component, but it should be understood that other components may be present in between.

[0016] On the other hand, when an element is referred to as being "directly coupled" or "directly connected" to another element, it should be understood that there are no other elements in between.

[0017] 1 is a side cross-sectional view showing an embodiment of a trapping net for limiting leakage current of an underwater motor according to the present invention. As shown in FIG. 1, the trapping net 100 for limiting leakage current of an underwater motor according to the present invention includes a cylindrical body 110 and a grounding portion 120.

[0018] The cylindrical body 110 has a mesh structure made of a conductive material such as stainless steel, and houses the submersible motor 200 inside. The neutral wire N of the three-phase power cable 300 connected to the submersible motor 200 is connected to the inner surface, expanding the area of ​​the neutral wire N and thereby capturing leakage current leaking from the phase voltage wires R, S, and T of the three-phase power cable 300 connected to the submersible motor 200.

[0019] In this case, the conductive tubular body 110 can be embodied in a cylindrical or polygonal tubular shape. Figure 2 is a plan cross-sectional view showing an embodiment of the tubular body of the underwater motor leakage current limiting capture net according to the present invention. Figure 2(a) shows an example in which the conductive tubular body 110 is shaped like a cylinder, (b) shows an example in which the conductive tubular body 110 is shaped like a square cylinder, and (c) shows an example in which the conductive tubular body 110 is shaped like a regular hexagonal cylinder.

[0020] The underwater motor 200 includes a rotating shaft 210, a rotor 220 including a permanent magnet axially mounted on the rotating shaft, a stator 230 that houses the rotor inside, a coil 240 wound around the teeth on the inner edge of the stator, a housing 250 that encases and protects these from the outside, and an upper cap 260 and a lower cap 270 that are respectively coupled to both ends of the housing.

[0021] The phase voltage lines R, S, and T of the three-phase power cable 300 are connected in a Y-connection to the coil 240, and when power is applied to the coil 240, a current flows through the coil. Depending on the direction of the current flowing through the coil, the rotor 220 including a permanent magnet rotates in the forward or reverse direction, thereby rotating a propeller (not shown) mounted on the rotating shaft 210, etc.

[0022] A leakage current occurs where the phase voltage wires R, S, and T of the three-phase power cable 300 are connected to the coil 240 underwater, and if a human body comes into contact with water through which the leakage current is flowing, an electric shock accident will occur.

[0023] However, in the present invention, the neutral wire N of the three-phase power cable 300 connected to the underwater motor 200 is connected to the inner surface of the cylindrical body 110 made of a conductive material, so that the area of ​​the neutral wire is expanded compared to the area of ​​the phase voltage wires R, S, T, and the leakage current is limited by the difference in area between the phase voltage wires R, S, T and the neutral wire N.

[0024] The reason for this is that, as described in Korean Patent Registration No. 10-1404806 (announced on June 12, 2014) and other documents mentioned in the prior art, the larger the area of ​​the conductor connected to the (-) end of the power supply (corresponding to the neutral wire N of the present invention) compared to the conductor connected to the (+) end of the power supply (corresponding to the phase voltage wires R, S, and T of the present invention), the smaller the leakage current becomes.

[0025] Specifically, when current leaks through the phase voltage wires R, S, and T of the three-phase power cable 300 that supplies power to the submersible motor 200, current flows through the phase voltage wires R, S, and T of the three-phase power cable 300 → water → the cylindrical body 110 made of a conductive material → the neutral wire N of the three-phase power cable 300.

[0026] During this process, the current leaking into the water from the phase voltage lines R, S, and T of the three-phase power cable 300 does not flow into the human body, which has a relatively high resistance, but flows through the water to the cylindrical body 110 made of a conductive material and is drawn into the neutral line N of the three-phase power cable 300, thereby restricting the leakage current from flowing into the human body and minimizing the risk of electric shock to the human body.

[0027] The ground part 120 is attached to the outer surface of the cylindrical body 110 made of a conductive material and is connected to the ground G. For example, the ground part 120 may be made of a dielectric material.

[0028] When an overcurrent is generated due to a sudden high voltage being applied to the submersible motor 200 or an unintentional wire connection, etc., and the overcurrent leaks into the cylindrical body 110, the grounding part 120 allows the overcurrent to flow to the ground G, thereby protecting the submersible motor 200 and preventing electric shock to the human body.

[0029] By implementing the invention in this way, the area of ​​the neutral wire of the three-phase power cable that supplies power to the submersible motor can be expanded, and the leakage current leaking from the phase voltage lines R, S, and T of the three-phase power cable connected to the submersible motor can be restricted from flowing into the human body, thereby preventing electric shock accidents.

[0030] The various embodiments disclosed in this specification and in the drawings are presented as specific examples for ease of understanding and are not intended to limit the scope of the various embodiments of the present invention.

[0031] Therefore, the scope of the various embodiments of the present invention should be interpreted as including all modifications and variations derived based on the technical concept of the various embodiments of the present invention, in addition to the embodiments described in this specification. [Industrial Applicability]

[0032] The present invention is industrially applicable in the technical field of leakage current limiting for underwater motors and its applied technical fields. [Explanation of symbols]

[0033] 100 Underwater motor leakage current limiting capture net 110 Cylindrical body 120 Grounding part 200 Underwater Motor 210 Rotational Axis 220 rotor 230 Stator 240 coils 250 Housing 260 Upper Cap 270 Lower Cap 300 Three-phase power cable

Claims

1. A cylindrical body made of a conductive material, having a mesh structure made of a conductive material, in which an underwater motor is housed, and in which the neutral wire N of a three-phase power cable connected to the underwater motor is connected to its inner surface, and the area of ​​the neutral wire N is expanded to be larger than the area of ​​the phase voltage wires R, S, T of the three-phase power cable, thereby capturing leakage current leaking from the phase voltage wires R, S, T of the three-phase power cable connected to the underwater motor; and a grounding portion attached to the outer surface of the cylindrical body made of conductive material and connected to the ground G.

2. An underwater motor leakage current limiting capture net as described in claim 1, wherein the tubular body made of conductive material is cylindrical.

3. An underwater motor leakage current limiting capture net as described in claim 1, wherein the cylindrical body made of conductive material is polygonal cylindrical.

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