Method for sealing cable holes in high-voltage power distribution ring network cabinet or cable docking box

Abstract

The invention discloses a method for sealing cable holes in a high-voltage power distribution ring network cabinet or a cable docking box, which is characterized in that the cable hole sealing method comprises the following steps: opening a hole, passing a cable, sealing, and grounding a wire; the sealing has strong sealing performance and good sealing effect, and no maintenance is required.

Description

Technical Field

[0001] The invention relates to the technical field of cable hole plugging methods, and in particular to a cable hole plugging method for a high-voltage power distribution ring network cabinet or a cable docking box. Background Art

[0002] At present, the high-voltage power distribution ring network cabinets or cable docking boxes in operation are basically mass-produced by manufacturers and then transported to the site for installation and use. Due to the different thicknesses and sizes of the cables to be installed, and the inability of the country to unify the size and model of the cable holes on the bottom plate of the high-voltage power distribution ring network cabinets or cable docking boxes, the positions of the cable holes on the bottom plate of the high-voltage power distribution ring network cabinets or cable docking boxes produced by different manufacturers are different, and the sizes are not entirely reasonable. As a result, during the installation of large-scale cable wiring, the bottom plate needs to be cut and expanded without authorization because the cable cannot pass through the cable hole on the bottom plate; because the hole is cut and expanded manually, although the cable can be inserted, the hole after the cable is inserted needs to be blocked. Traditionally, fireproof mud is basically used as a cable hole blocking material. The use of fireproof mud itself has many defects, such as cracking, high-temperature melting and sagging, gaps caused by external force vibration, and maintenance.

[0003] In addition, in the construction of public grounding wire connection of traditional high-voltage distribution ring network cabinets or cable docking boxes, due to unreasonable wiring methods, some grounding wires are wrapped together with high-voltage cables. This increases the diameter of the perforated cable, and it is also necessary to cut the bottom plate to expand the hole. After expanding the hole, it is also necessary to use fireproof mud to seal the hole after the cable is inserted.

[0004] In summary, the use of fireproof mud as a plugging material has defects, such as the cable hole sealing is easily damaged, causing the high-voltage power distribution ring network cabinet switch compartment / cable docking box equipment to operate in a humid environment for a long time, condensation in the secondary chamber, and insulation degradation of high-voltage switches, PT and other equipment, and even explosions. Therefore, the distribution network always has the risk of "disease" operation.

[0005] Therefore, there is an urgent need for a method for sealing the cable holes in a high-voltage distribution ring network cabinet or a cable docking box to solve the above problems. Summary of the invention

[0006] In order to solve this problem, the present invention discloses a method for plugging cable holes in a high-voltage power distribution ring network cabinet or a cable docking box, which has strong sealing performance, good plugging effect, and no maintenance is required. The method for plugging cable holes in a high-voltage power distribution ring network cabinet or a cable docking box is characterized in that the cable hole plugging method comprises the following steps: opening a hole - inserting a cable - plugging - grounding wire;

[0007] Step 1: Drilling

[0008] The bottom plate is made of 304 stainless steel 2mm steel plate. According to the different specifications of cables, round holes or track holes are opened on the bottom plate to pass the cables. A grounding wire through hole (17) is opened on the common grounding bar side of the cable hole.

[0009] Step 2: Thread the cable

[0010] The cable (11) in the cable well passes upward through the cable hole of the circular hole bottom plate 1 (7-1) or the track hole bottom plate 2 (7-2) and is connected to the terminal head for fixing; the fixing piece (1) with the sealing ring 1 (5) is combined with the set (2) with the sealing ring 2 (6), and the eccentric structure of the fixing piece (1) is used to compensate the tilt angle of the cable (11), so that the fixing piece (1) and the set (2) are tightly fixed on the bottom plate 1 (7-1) or the bottom plate 2 (7-2). If it is the bottom plate 2 (7-2), a 0.5mm thick silicone track gasket is added thereon, and the circular hole track plate (16) is covered on the track hole of the bottom plate 2 (7-2); the gap between the matching piece (3) and the cable (11) passing inside is connected with the matching piece (3) and the cable (11) by a transition piece (15), and a cold shrink tube or a heat shrink tube ( 4) The shrink sleeve is wrapped around the matching piece (3), the transition piece (15) and the cable (11) inserted inside. The function of the transition piece (15) is to make the matching piece (3) and the cable (11) inserted inside smoothly transition. After the shrink tube or heat shrink tube (4) is shrunk and wrapped, there is no step, so as to avoid uneven force on the step and material fatigue affecting the service life of the shrink tube or heat shrink tube (4). After the shrink tube or heat shrink tube (4) is wrapped, the pad is wrapped with aluminum foil tape at the matching piece (3), and the stainless steel tie hoop (13) is tightened. The function of the pad is to avoid damage to the shrink tube or heat shrink tube (4) when the stainless steel tie hoop (13) tightens the shrink tube or heat shrink tube (4) for a long time. The function of the stainless steel tie hoop (13) is to prevent the shrink tube or heat shrink tube (4) from falling off from the matching piece (3) due to thermal expansion and contraction in a natural environment for a long time.

[0011] Step 3: Blocking

[0012] A new polymer potting glue (14) is injected from the cup mouth of the fixing member (1), and after the polymer potting glue (14) is cured, it has the effects of flame retardancy and moisture resistance;

[0013] Step 4: Grounding

[0014] The screw rod (18) is inserted into the grounding wire through hole (17) of the bottom plate, and the screw rod (18) is fixed to the bottom plate by using sealing gaskets (23), washers (22) and thin nuts (21) on both sides; one end of the grounding wire nose (20-1) on the bottom plate is connected to the common grounding bar, and the other end of the grounding wire nose (20-1) is fixed to the screw rod (18) by using nut (19-1); one end of the grounding wire nose (20-2) under the bottom plate is fixed to the screw rod (18) by using nut (19-2), and the other end of the grounding wire nose (20-2) is connected to the grounding device.

[0015] The beneficial effects of the present invention are:

[0016] The plugging device of the present invention has strong sealing performance and good plugging effect, and does not require maintenance.

[0017] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0018] The advantages and features of the present invention are described in detail below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the installation structure of the present invention;

[0020] Figure 2-Figure 6 It is a schematic diagram of the structure of some components of the present invention;

[0021] Figure 7 It is a schematic diagram of ground wire installation of the present invention. DETAILED DESCRIPTION

[0022] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0023] In order to fully understand the present invention, a detailed structure will be presented in the following description. Obviously, the implementation of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0024] The embodiments of the present invention are described in detail below.

[0025] Reference Figure 1-Figure 7 As shown, a method for plugging a cable hole in a high-voltage power distribution ring network cabinet or a cable docking box is characterized in that the cable hole plugging method comprises the following steps: opening a hole - inserting a cable - plugging - grounding a wire;

[0026] Step 1: Drilling

[0027] The bottom plate is made of 304 stainless steel 2mm steel plate. According to the different specifications of cables, round holes or track holes are opened on the bottom plate to pass the cables. A grounding wire through hole (17) is opened on the common grounding bar side of the cable hole.

[0028] Step 2: Thread the cable

[0029] The cable (11) in the cable well passes upward through the cable hole of the circular hole bottom plate 1 (7-1) or the track hole bottom plate 2 (7-2) and is connected to the terminal head for fixing; the fixing piece (1) with the sealing ring 1 (5) is combined with the set (2) with the sealing ring 2 (6), and the eccentric structure of the fixing piece (1) is used to compensate the tilt angle of the cable (11), so that the fixing piece (1) and the set (2) are tightly fixed on the bottom plate 1 (7-1) or the bottom plate 2 (7-2). If it is the bottom plate 2 (7-2), a 0.5mm thick silicone track gasket is added thereon, and the circular hole track plate (16) is covered on the track hole of the bottom plate 2 (7-2); the gap between the matching piece (3) and the cable (11) passing inside is connected with the matching piece (3) and the cable (11) by a transition piece (15), and a cold shrink tube or a heat shrink tube ( 4) The shrink sleeve is wrapped around the matching piece (3), the transition piece (15) and the cable (11) inserted inside. The function of the transition piece (15) is to make the matching piece (3) and the cable (11) inserted inside smoothly transition. After the shrink tube or heat shrink tube (4) is shrunk and wrapped, there is no step, so as to avoid uneven force on the step and material fatigue affecting the service life of the shrink tube or heat shrink tube (4). After the shrink tube or heat shrink tube (4) is wrapped, the pad is wrapped with aluminum foil tape at the matching piece (3), and the stainless steel tie hoop (13) is tightened. The function of the pad is to avoid damage to the shrink tube or heat shrink tube (4) when the stainless steel tie hoop (13) tightens the shrink tube or heat shrink tube (4) for a long time. The function of the stainless steel tie hoop (13) is to prevent the shrink tube or heat shrink tube (4) from falling off from the matching piece (3) due to thermal expansion and contraction in a natural environment for a long time.

[0030] Step 3: Blocking

[0031] A new polymer potting glue (14) is injected from the cup mouth of the fixing member (1), and after the polymer potting glue (14) is cured, it has the effects of flame retardancy and moisture resistance;

[0032] Step 4: Grounding

[0033] The screw rod (18) is inserted into the grounding wire through hole (17) of the bottom plate, and the screw rod (18) is fixed to the bottom plate by using sealing gaskets (23), washers (22) and thin nuts (21) on both sides; one end of the grounding wire nose (20-1) on the bottom plate is connected to the common grounding bar, and the other end of the grounding wire nose (20-1) is fixed to the screw rod (18) by using nut (19-1); one end of the grounding wire nose (20-2) under the bottom plate is fixed to the screw rod (18) by using nut (19-2), and the other end of the grounding wire nose (20-2) is connected to the grounding device.

[0034] The present invention has the following advantages over the traditional process:

[0035] 1. Use 304 stainless steel material to ensure long-term corrosion-free use in natural environment;

[0036] 2. The openings in the bottom plate of the switch compartment / cable docking box of the high-voltage power distribution ring main unit are of uniform size and fixed position, which is convenient for blocking with fixings;

[0037] 3. Use silicone sealing pads on both sides of the bottom plate to ensure double-sided sealing between the fixing parts and the switch compartment of the high-voltage distribution ring network cabinet / the bottom plate of the cable docking box;

[0038] 4. The heat / cold shrink tube seals the gap between the cable and the mating parts, and the contact is tight and will not fall off;

[0039] 5. The new polymer material potting glue replaces the fireproof mud as the sealing material to seal the gap between the cable and the fixing parts. It has a good sealing effect and can be used for a long time in a temperature environment of -40℃-100℃, while reaching the V-0 flame retardant grade;

[0040] 6. Each component of the whole plugging device has no hard stress points and no hard bending points. The material is not easy to fatigue. The material can reach its full service life and is maintenance-free.

[0041] The beneficial effects of this embodiment are:

[0042] This embodiment has strong sealing performance, good sealing effect, and no maintenance is required.

[0043] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for sealing cable holes in a high-voltage power distribution ring network cabinet or a cable docking box, characterized in that: The cable hole plugging method comprises the following steps: opening a hole - inserting a cable - plugging - grounding a wire; Step 1: Drilling The bottom plate is made of 304 stainless steel 2mm steel plate. According to the different specifications of cables, round holes or track holes are opened on the bottom plate to pass the cables. A grounding wire through hole (17) is opened on the common grounding bar side of the cable hole. Step 2: Thread the cable The cable (11) in the cable well passes upward through the cable hole of the circular hole bottom plate 1 (7-1) or the track hole bottom plate 2 (7-2) and is connected to the terminal head for fixing; the fixing piece (1) with the sealing ring 1 (5) is combined with the set (2) with the sealing ring 2 (6), and the eccentric structure of the fixing piece (1) is used to compensate the tilt angle of the cable (11), so that the fixing piece (1) and the set (2) are tightly fixed on the bottom plate 1 (7-1) or the bottom plate 2 (7-2). If it is the bottom plate 2 (7-2), a 0.5mm thick silicone track gasket is added thereon, and the circular hole track plate (16) is covered on the track hole of the bottom plate 2 (7-2); the gap between the matching piece (3) and the cable (11) passing inside is connected with the matching piece (3) and the cable (11) by a transition piece (15), and a cold shrink tube or a heat shrink tube ( 4) The shrink sleeve is wrapped around the matching piece (3), the transition piece (15) and the cable (11) inserted inside. The function of the transition piece (15) is to make the matching piece (3) and the cable (11) inserted inside smoothly transition. After the shrink tube or heat shrink tube (4) is shrunk and wrapped, there is no step, so as to avoid uneven force on the step and material fatigue affecting the service life of the shrink tube or heat shrink tube (4). After the shrink tube or heat shrink tube (4) is wrapped, the pad is wrapped with aluminum foil tape at the matching piece (3), and the stainless steel tie hoop (13) is tightened. The function of the pad is to avoid damage to the shrink tube or heat shrink tube (4) when the stainless steel tie hoop (13) tightens the shrink tube or heat shrink tube (4) for a long time. The function of the stainless steel tie hoop (13) is to prevent the shrink tube or heat shrink tube (4) from falling off from the matching piece (3) due to thermal expansion and contraction in a natural environment for a long time. Step 3: Blocking A new polymer potting glue (14) is injected from the cup mouth of the fixing member (1), and after the polymer potting glue (14) is cured, it has the effects of flame retardancy and moisture resistance; Step 4: Grounding The screw rod (18) is inserted into the grounding wire through hole (17) of the bottom plate, and the screw rod (18) is fixed to the bottom plate by using sealing gaskets (23), washers (22) and thin nuts (21) on both sides; one end of the grounding wire nose (20-1) on the bottom plate is connected to the common grounding bar, and the other end of the grounding wire nose (20-1) is fixed to the screw rod (18) by using nut (19-1); one end of the grounding wire nose (20-2) under the bottom plate is fixed to the screw rod (18) by using nut (19-2), and the other end of the grounding wire nose (20-2) is connected to the grounding device.

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