CN219458646U - Three-phase cross interconnection protection grounding box - Google Patents

Abstract

The utility model relates to a three-phase cross interconnection protection grounding box which comprises a box body and a protector, wherein four wire inlet pipes are arranged on the side wall of the box body, an insulation assembly is arranged in each wire inlet pipe, each insulation assembly comprises an inner limiting ring, an inner protective sleeve, an insulation female end sleeve and an insulation end sleeve, the inner protective sleeve is sleeved on the inner wall of each wire inlet pipe, the outer side face of each insulation female end sleeve is bonded on the inner wall of each wire inlet pipe, the inner limiting rings are positioned on the inner sides of the wire inlet pipes and are in contact with the inner wall of the box body, the insulation end sleeves are sleeved on the outer side faces of grounding cables, and the insulation end sleeves are sleeved in the insulation female end sleeves. The wire inlet pipe is high in hardness, plays a role in supporting and fixing, is simpler in installation of an insulating component, is high in installation efficiency and installation quality, forms a firmer sealing effect through sealing of the heat shrinkage pipe, the waterproof tape layer and the PVC tape layer, is waterproof and moistureproof, prolongs the service life of the wire inlet pipe, and ensures the effectiveness of grounding.

Description

Three-phase cross interconnection protection grounding box

Technical Field

The utility model relates to the technical field of grounding boxes, in particular to a three-phase cross interconnection protection grounding box.

Background

At present, a single-core cable is mostly adopted as a high-voltage cable with the voltage less than or equal to 35-220kV, the relationship between a wire core of the single-core cable and a metal protective layer can be regarded as a single-turn transformer, and when the current passes through the wire core of the single-core cable, magnetic force lines are intersected with an aluminum package or a metal shielding layer, so that induced voltages appear at two ends of the single-core cable. The common protection mode comprises that the magnitude of the induced voltage is in direct proportion to the length of a cable line and the current flowing through a conductor, and when the cable is long, the induced voltages on the sheath are overlapped to the extent that personal safety is endangered. The principle of the method is that each large section of cable is divided into three sections with equal length, an insulating joint is arranged between each two sections, three phases of the cable sheath at the joint are connected in a transposition mode through coaxial cable leads and a cross interconnection grounding box and a protector, so that induced potential of the metal sheath of the high-voltage cable is eliminated, and the vector is zero after the superposition of induced voltage is realized through two cross interconnection boxes and twice interchange, so that the effect of limiting the induced voltage is achieved.

Most of the current wire inlet pipes of the grounding box are metal wire inlet pipes integrated with the box body, most of the grounding boxes are installed in the cable well due to cross interconnection, water accumulation is easy to occur in the cable well due to darkness and wetness, sealing performance between the wire inlet pipes of the current grounding box and the cable is poor, water vapor enters the box body, grounding failure can be caused, and the cable metal sheath induces current is large. For the hard incoming line pipe, a gap is formed between the grounding cable and the wiring port, and the sealing mode is that the grounding cable is wound by adopting an insulating tape on site, and then the insulating tape is hard plugged into the incoming line pipe.

There are also some wire inlet pipes which adopt heat shrink pipes to solve the problem of tightness, such as the Chinese patent document disclosed by the authority bulletin No. CN 212304610U, and the wire inlet pipe comprises a box body, wherein an insulating plate is fixedly arranged in the box body, an outer conductor clamping seat is fixedly arranged on the front surface of the insulating plate, a copper bar is fixedly arranged on the front surface of the outer conductor clamping seat, an inner conductor clamping seat is fixedly arranged on one side, far away from the outer conductor clamping seat, of the copper bar, the inner conductor clamping seat is connected with a protector, the protector is connected with a support, a wiring terminal is arranged at one end of the support, a first heat shrink pipe is fixedly arranged at the bottom of the box body, and a power transmission cable is sleeved in the first heat shrink pipe. It has the following problems: under the condition of environmental change, the heat shrinkage pipe is easy to age, and the cable expands with heat and contracts with cold along with the external environment, so that the heat shrinkage pipe has a difference with the thermal deformation stress between the heat shrinkage pipe, gaps can be generated under the cold and hot circulation, the sealing effect is lost, and the water leakage phenomenon is caused.

Disclosure of Invention

In order to overcome the defects, the utility model aims to provide a three-phase cross interconnection protection grounding box sealing assembly.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a three-phase alternately interconnected protection earthing box, includes box, protector, the lateral wall of box is equipped with four inlet tubes, be equipped with insulation component in the inlet tube, insulation component includes interior spacing ring, interior protective sheath, insulating female pot head, insulator pot head, the inner of insulating female pot head and the outer fixed connection of interior protective sheath, and the inner of interior protective sheath is equipped with interior spacing ring, interior protective sheath cup joints on the inner wall of inlet tube, and insulating female pot head lateral surface bonds on the inner wall of inlet tube, and interior spacing ring is located the inboard of inlet tube and the inner wall contact of box, the insulator pot head cup joints the lateral surface at the earth connection cable, and the cup joints in insulating female pot head, the internal surface of insulating female pot head is equipped with the toothed ring towards inboard, the surface of insulator pot head is equipped with the toothed ring towards the outside, and the toothed ring towards inboard is the same with the toothed ring shape towards the outside.

The insulation board is fixedly installed in the box body, three conductor clamping seats are fixedly installed on the front face of one side, close to a plurality of wire inlet pipes, of the insulation board, three copper blocks are uniformly and fixedly installed on the front face of one side, far away from the conductor clamping seats, of the insulation board, a first copper bar is fixedly installed on the front face of the first conductor clamping seat, a first copper bar is fixedly installed on the front face of the second conductor clamping seat, the other end of the first copper bar is fixedly connected with the second copper bar, the other end of the second copper bar is fixedly connected with the first copper block, the first copper bar, the second copper bar, the conductor clamping seats and the copper blocks are further fastened together through bolts, one side of each copper block is connected with one end of a connecting piece protector, the other end of the protector is connected with a support through bolts, a main wiring terminal is fixedly installed at one end of the support, and the end of the main wiring terminal is fastened together through a main bolt and a main nut.

Specifically, the inlet wire pipe adopts the same metal material as the box, welds together with the box.

Specifically, the outer diameter of the tooth ring at the innermost end of the insulator end sleeve is larger than the outer diameters of other tooth rings and larger than the inner diameter of the tooth ring at the innermost end of the insulator female end sleeve.

Specifically, the inlet wire outside is equipped with waterproof tape layer with the earth cable, is equipped with the pyrocondensation pipe in inlet wire outside, waterproof tape layer outside, earth cable outside, is equipped with preceding waterproof tape layer in pyrocondensation pipe and inlet wire outside, and the outside of pyrocondensation pipe, preceding waterproof tape layer, inlet wire is equipped with preceding PVC sticky tape layer, is equipped with back waterproof tape layer between thermoplastic pipe and earth cable, and the outside of pyrocondensation pipe, back waterproof tape layer, earth cable is equipped with back PVC sticky tape layer.

Specifically, the base materials of the insulating female end sleeve and the insulating insulator end sleeve are soft polyvinyl chloride films, and rubber pressure-sensitive adhesives are coated on the outer surface of the insulating female end sleeve and the inner surface of the insulating insulator end sleeve.

Specifically, the outer end side of the insulator end sleeve is provided with an insulating tape, namely, the substrate of the insulator end sleeve and the substrate of the insulating tape are of an integrated structure.

The beneficial effects of the utility model are as follows: the inlet wire pipe adopts the metal material the same with the box in this application, welds together with the box, and its hardness is high, plays the fixed effect of support, and insulating subassembly's insulating female pot head, insulator pot head are prefabricated simultaneously, and the tolerance is controllable within range, and its installation is simpler, and installation effectiveness and installation quality are high, through the sealed of pyrocondensation pipe, waterproof tape layer, PVC band layer, form more firm sealed effect, effectually carry out dampproofing and waterproofing, prolong its life, guarantee the validity of ground connection.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a schematic view of a structure of a wire inlet pipe of the present utility model.

Fig. 3 is a schematic diagram of the relationship between the insulator end cap and the cable of the present utility model.

Fig. 4 shows the wire stripping requirements in the actual wire bonding operation of the present utility model.

In the figure, a box body 1, an insulating plate 2, a conductor clamping seat 3, a copper block 4, a protector 5, a bracket 6, a connecting bolt 7, a first wiring terminal 8, a first copper bar 9, a second copper bar 10, a wire inlet pipe 11, an insulating assembly 12, an inner 1201 limiting ring, an 1202 inner protective sleeve 1203, an insulating female end sleeve 1204, an insulating rubber belt layer 1205, a heat shrink tube 13, a front 1301 waterproof belt layer, a front 1302 PVC rubber belt winding layer, a rear 1303 waterproof belt layer, a rear 1304 PVC rubber belt layer, a 14 waterproof belt layer and a 15 grounding cable.

Detailed Description

The utility model will now be described in further detail with reference to the accompanying drawings.

The utility model provides a three-phase alternately interconnected protection earthing box as shown in fig. 1 through 4, includes box 1, protector 5, case lid, the lateral wall of box 1 is equipped with four inlet tube 11, and at least three inlet tube 11 is located the homonymy, conveniently makes wire connection, and inlet tube 11 adopts the metal material the same as box 1, and is in the same place with box 1 welding, be equipped with insulation component in the inlet tube 11, insulation component includes inner stop collar 1201, inner protective sleeve 1202, insulator female end cover 1203, insulator female end cover 1204, and the inner of insulator female end cover 1203 and the outer fixed connection of inner protective sleeve 1202, and the inner of inner protective sleeve 1202 is equipped with inner stop collar 1201, and the inner of insulator female end cover 1203 is equipped with the adapter sleeve, and the adapter sleeve is much thinner than insulator female end cover 1203 body, and the lateral surface of sleeve 1202 mainly plays the connection fixed action to be in the same through the tie coat, inner protective sleeve 1202, insulator female end cover 1203 are as an organic whole structure cover on the inner wall of inlet tube, and the inner wall contact of inner stop collar 1201 and box 1, play the effect that installs the insulator female end cover 1203, the cable is equipped with the inside facing to the outside of insulator female end cover 1205, the cable is equipped with the insulator female end cover's 15 facing to the outside of insulator female end cover's surface 1205, and the insulator female end cover's 15 is equipped with the insulator tooth ring's face of the insulator female end cover's 15.

The inside fixed mounting of box 1 has insulation board 2, the positive fixed mounting in proper order in one side that is close to a plurality of inlet tubes of insulation board 2 has three conductor holder 3, and the positive even fixed mounting in proper order in one side that the conductor holder 3 was kept away from to insulation board 2 has three copper bar, and the positive fixed mounting of first, second conductor holder 3 has first copper bar 9, and the other end of first copper bar 9 respectively with second, third copper bar 4 fixed connection, the positive fixed mounting of third conductor holder 3 has second copper bar 10, the other end and the first copper bar 4 fixed connection of second copper bar 10, further be in the same place through the bolt-up between first copper bar 9, second copper bar 10 and conductor holder 3, the copper bar 4, one side of copper bar 4 is connected through the one end of connecting piece protector 5, and the other end of protector 5 passes through the bolt and links to each other with support 6, the one end fixed mounting main binding post 8 of support 6, and the tip of main binding post 8 passes through the main bolt and is in the same place through the main nut fastening.

Specifically, the outer diameter of the innermost toothed ring of the insulator end sleeve 1204 is larger than the outer diameters of other toothed rings and is also larger than the inner diameter of the innermost toothed ring of the insulator end sleeve 1203, when in assembly, more points are inserted, the innermost toothed ring of the insulator end sleeve 1204 is inserted to exceed the innermost toothed ring of the insulator end sleeve 1203, then the grounding cable 15 is pulled outwards, the toothed ring at the inner end of the insulator end sleeve 1204 and the toothed ring at the inner end of the insulator end sleeve 1203 are pressed together, meanwhile, the insulating tape 1205A is wound at the outer end face of the wire inlet pipe 11 to form an insulating tape winding layer 1205, a certain pressure is applied between the innermost toothed ring of the insulator end sleeve 1204 and the insulating tape winding layer 1205 to play a role in pre-stress, the toothed ring facing the inner side and the toothed ring facing the outer side are pressed together in a shape fit to play a role in sealing, and are prefabricated within a controllable tolerance range, and the installation is simpler, and the installation efficiency and the installation quality are high.

Specifically, in order to further ensure the waterproof sealing performance, waterproof tapes are wound between the outer side of the incoming pipe 11 and the grounding cable 15 to form a waterproof tape layer 14, heat shrinkage tubes 13 are arranged on the outer side of the incoming pipe 11, the outer side of the waterproof tape layer 14 and the outer side of the grounding cable 15, the outer side of the incoming pipe 11, the outer side of the waterproof tape layer 14 and the outer side of the grounding cable 13 are coated after being heated to form a sealing structure, waterproof tapes are wound between the heat shrinkage tubes 13 and the incoming pipe 11 to form a front waterproof tape layer 1301, the heat shrinkage tubes 13, the front waterproof tape layer 1301 and the outer side of the incoming pipe 11 are wound by PVC adhesive tapes to form a front PVC adhesive tape layer 1302, then waterproof tape layers 1303 and the outer side of the grounding cable 15 are wound by PVC adhesive tapes to form a rear PVC adhesive tape layer 1304, the sealing functions of the two ends of the heat shrinkage tubes 13 are achieved, the sealing performance of the heat shrinkage tubes is better, and the service life of the heat shrinkage tubes is prolonged.

Specifically, the base materials of the insulating female end sleeve 1203 and the insulating insulator end sleeve 1204 are soft polyvinyl chloride (PVC) films, rubber pressure-sensitive adhesives are coated on the outer surface of the insulating female end sleeve 1203 and the inner surface of the insulating insulator end sleeve 1204, release papers are arranged on the surfaces of the insulating female end sleeve 1203 and the insulating insulator end sleeve 1204 for protection before assembly, and when the insulating female end sleeve 1203 and the insulating insulator end sleeve 1204 are assembled, the corresponding release papers are removed according to the steps and adhered to the corresponding positions.

Specifically, the outer end of the insulator end cover 1204 is provided with an insulating tape 1205A, that is, the substrate of the insulator end cover 1204 and the substrate of the insulating tape 1205A are in an integrated structure, and the insulating tape, as shown in fig. 3, is an expanded schematic diagram of the insulating tape 1205A.

The inner limiting ring 1201, the inner protecting sleeve 1202 and the insulating female end sleeve 1203 can be preinstalled in a wire inlet pipe in a factory, release paper on the outer surface of the insulating female end sleeve 1203 is removed, the insulating female end sleeve 1203 is inserted into the wire inlet pipe from the inside, the inner protecting sleeve 1202 sequentially enters the wire inlet pipe, the inner limiting ring is placed on the inner side of the wire inlet pipe, then a round rod is used for being inserted into the insulating female end sleeve 1203, the outer side surface of the insulating female end sleeve 1203 and the inner side wall of the wire inlet pipe are uniformly adhered together, and the time for on-site wiring is saved.

Coaxial cable cross section range suitable for cross interconnection protection grounding boxIs 95-400mm ² The cable system corresponding to different voltage grades only needs to be replaced by protectors of different models, and 110kV cable systems are taken as an example, and the protector parameters are as follows:

the installation steps are as follows:

1. checking whether the outer sheath of the grounding cable 15 is damaged, checking whether the case body 1 and the case cover (not shown) are deformed, checking whether the sealing surface is scratched, and checking the parts;

2. stripping and cutting the end of the grounding cable for standby according to the size shown in fig. 4;

3. the heat shrinkage tube 13 is sleeved into the stripped grounding cable 15;

4. the grounding cable 15 sequentially penetrates into the box body 1 from a wire inlet, is fixedly connected with the conductor clamping seat 3, and is well fixed by bolts;

5. after the first grounding cable 15 is fixed, a second grounding cable is threaded, and the operation of 4 is repeated until all four grounding cables 15 are fixed;

6. cleaning the surface of the wire inlet pipe 11, removing foreign matters such as greasy dirt and the like, and sealing the wire inlet according to the process shown in fig. 3, wherein the length of the wire inlet pipe is 70mm, and the heat shrinkage pipe is optimally overlapped with the outer part of the wire inlet pipe by 30mm after shrinkage;

7. the box cover is fastened on the box body by bolts, and the bolts are uniformly and symmetrically fastened for three times, so that the bolts at a single position cannot be fastened in place at one time, and otherwise, the box cover is deformed.

The utility model is not limited to the embodiments, and any person should know the structural changes made under the teaching of the utility model, and all the technical schemes which are the same or similar to the utility model fall within the protection scope of the utility model.

The technology, shape, and construction parts of the present utility model, which are not described in detail, are known in the art.

Claims (8)

1. The utility model provides a three-phase alternately interconnected protection earthing box, includes box, protector, the lateral wall of box is equipped with four inlet tubes, its characterized in that: an insulating assembly is arranged in the wire inlet pipe and comprises an inner limiting ring, an inner protective sleeve, an insulating female end sleeve and an insulating insulator end sleeve, the inner end of the insulating female end sleeve is fixedly connected with the outer end of the inner protective sleeve, the inner end of the inner protective sleeve is provided with the inner limiting ring, the inner protective sleeve is sleeved on the inner wall of the wire inlet pipe, the outer side face of the insulating female end sleeve is bonded on the inner wall of the wire inlet pipe, the inner limiting ring is located on the inner side of the wire inlet pipe and in contact with the inner wall of the box body, the insulator end sleeve is sleeved on the outer side face of the grounding cable, and the insulator end sleeve is sleeved in the insulating female end sleeve.

2. The three-phase cross-connect protective grounding box of claim 1, wherein: the inner surface of the insulating female end sleeve is provided with an inwards facing toothed ring, the outer surface of the insulator end sleeve is provided with an outwards facing toothed ring, and the inwards facing toothed ring and the outwards facing toothed ring are identical in shape.

3. The three-phase cross-connect protective grounding box of claim 1, wherein: the inlet wire pipe adopts the same metal material with the box, welds together with the box.

4. The three-phase cross-connect protective grounding box of claim 1, wherein: the outer diameter of the tooth ring at the innermost end of the insulator end sleeve is larger than the outer diameters of other tooth rings and larger than the inner diameter of the tooth ring at the innermost end of the insulator female end sleeve.

5. The three-phase cross-connect protective grounding box of claim 1, wherein: the wire inlet pipe outside is equipped with waterproof tape layer with the earth cable, is equipped with the pyrocondensation pipe in wire inlet pipe outside, waterproof tape layer outside, earth cable outside, is equipped with preceding waterproof tape layer in pyrocondensation pipe and wire inlet pipe outside, and the outside of pyrocondensation pipe, preceding waterproof tape layer, wire inlet pipe is equipped with preceding PVC sticky tape layer, is equipped with back waterproof tape layer between thermoplastic pipe and earth cable, and the outside of pyrocondensation pipe, back waterproof tape layer, earth cable is equipped with back PVC sticky tape layer.

6. The three-phase cross-connect protective grounding box of claim 1, wherein: the base materials of the insulating female end sleeve and the insulating insulator end sleeve are soft polyvinyl chloride films, and rubber pressure-sensitive adhesives are coated on the outer surface of the insulating female end sleeve and the inner surface of the insulating insulator end sleeve.

7. The three-phase cross-connect protective grounding box of claim 1, wherein: the outer end side of the insulator end sleeve is provided with an insulating adhesive tape, namely, the substrate of the insulator end sleeve and the substrate of the insulating adhesive tape are of an integrated structure.

8. A three-phase cross-connect protective grounding box as in any one of claims 1 to 7 wherein: the insulation board is fixedly installed in the box body, three conductor clamping seats are fixedly installed on the front face of one side, close to a plurality of wire inlet pipes, of the insulation board, three copper blocks are uniformly and fixedly installed on the front face of one side, far away from the conductor clamping seats, of the insulation board, a first copper bar is fixedly installed on the front face of the first conductor clamping seat, a first copper bar is fixedly installed on the front face of the second conductor clamping seat, the other end of the first copper bar is fixedly connected with the second copper bar, the other end of the second copper bar is fixedly connected with the first copper block, the first copper bar, the second copper bar, the conductor clamping seats and the copper blocks are further fastened together through bolts, one side of each copper block is connected with one end of a connecting piece protector, the other end of the protector is connected with a support through bolts, a main wiring terminal is fixedly installed at one end of the support, and the end of the main wiring terminal is fastened together through a main bolt and a main nut.