CN211979281U

CN211979281U - OPGW optical cable draws ground device down

Info

Publication number: CN211979281U
Application number: CN202020698176.XU
Authority: CN
Inventors: 余涛
Original assignee: New Energy Technology Co ltd
Current assignee: New Energy Technology Co ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-11-20
Anticipated expiration: 2030-04-30

Abstract

The utility model provides a OPGW optical cable draws earthing device down, including door type framework and surplus cable case, door type framework top is provided with pressure limiting device, be provided with fixing device on the door type framework, the OPGW optical cable passes the guide pillar and continues in surplus cable case, be provided with the optical cable in the surplus cable case and coil seat and first isolator, install the installing support on the framework pole of door type framework lower part, fixed mounting has the earthing switch case on the installing support, one side of earthing switch case is connected with the short circuit ground wire, the end of short circuit ground wire is connected with the OPGW optical cable through the parallel groove fastener, earthing switch bottom of the case portion is provided with long earth connection, long earth connection links to each other with the transformer substation's grounding net, be provided with second isolator in the earthing switch case. The utility model discloses can realize the OPPGW optical cable and in time bleed current, avoid causing OPGW optical cable electric corrosion ablation cable, disconnected strand hidden danger. Meanwhile, convenience is provided for maintenance personnel during annual insulation supervision and detection of the OPGW and resistance detection of the grounding grid of the transformer substation.

Description

OPGW optical cable draws ground device down

Technical Field

The utility model relates to a power communication equipment technical field, in particular to OPGW optical cable draws ground device down.

Background

The application of the OPGW landing residual cable box is designed according to appendix B of Q/GDW 758 and 2012 electric power system communication optical cable installation process specifications, although the OPGW landing residual cable box is attractive in appearance and theoretically solves the problem of reliable insulation of the OPGW entering the ground, the problem of reliable insulation of the OPGW optical cable is not completely solved in practice.

The patent document with the publication number of 'CN 206431336U' provides a transformer substation insulating residual cable case that falls to the ground, draws earthing device including residual cable case and OPGW optical cable, and the OPGW optical cable draws earthing device from door type framework top entering residual cable case through the OPGW optical cable, and this patent has realized that the OPGW is insulating reliable, earthing nature is good, effectively solves hidden danger such as the electrical erosion cable burning of OPGW optical cable, disconnected strand.

However, the applicant finds the following technical problems in the process of actually applying the patent technology:

the OPGW optical cable is introduced into the process of the residual cable box under the door-shaped framework, insulation grounding processing is not conducted at the position of the inlet guide protection pipe opening, therefore, the risk that the OPGW optical cable is damaged, discharged and stranded is easily caused at the position of the inlet guide protection pipe opening, and the OPGW optical cable and the door-shaped framework are effectively guaranteed to be reliably insulated and greatly influenced in the whole process of introducing the optical cable into the OPGW optical cable.

Some solutions to the above technical problem are: at the front end of the optical cable guide pipe orifice, a specific position is about 200mm above the orifice, and a parallel groove clamp, a grounding wire and a grounding terminal are combined to directly connect the optical cable with a frame rod grounding point. The solution has the difficulty of construction limitation, and inconvenience and even delay of construction period and quality are brought to construction due to incomplete field conditions, installation tools and the like, and the in-and-out of design drawings and field reality. Meanwhile, when the OPGW annual insulation supervision detection of the transformer substation and the resistance detection of the grounding grid of the transformer substation are carried out, a pole needs to be climbed to remove the grounding wire, so that the labor intensity of operation and maintenance personnel is increased, and the detection efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a grounding device is drawn down to OPGW optical cable to solve among the prior art OPGW optical cable and introduce the in-process that goes into surplus cable case under door type framework, the OPGW optical cable is not done insulating ground connection and is handled getting into guide pillar mouth department, take place the OPGW optical cable easily and take place the damaged risk of disconnected strand that discharges in guide pillar mouth department, and the insulating supervision of transformer substation OPGW year detects, need step on the pole when transformer substation's ground net resistance detects and carry out the earth connection and demolish, fortune dimension personnel's intensity of labour has been increased, detection efficiency's problem has been reduced simultaneously.

In order to solve the technical problem, the utility model provides an OPGW optical cable draws ground device down, including door type framework and the surplus cable case that sets up in door type framework bottom, door type framework top is provided with the voltage limiting device that is used for carrying out voltage limiting discharge to the OPGW optical cable, door type framework upper portion is equidistant to be provided with a plurality of fixing devices that are used for fixing the OPGW optical cable, the OPGW optical cable of door type framework lower part passes through the guide pillar and continues in surplus cable case, be provided with the optical cable coiling seat and the first isolator that are used for rolling up the OPGW optical cable in the surplus cable case, the OPGW optical cable is before rolling up to optical cable coiling seat and before carrying out the butt fusion with the ADSS optical cable from optical cable coiling seat, the leading-out terminal of first isolator links to each other with the outside transformer substation's earth network, demountable installation support on the framework hack of door type framework lower part, the installation structure is characterized in that a grounding switch box is fixedly installed on the installation support, one side of the grounding switch box is connected with a short-circuit ground wire, the tail end of the short-circuit ground wire is connected with an OPGW (optical fiber composite overhead ground wire) above the guide protection pipe orifice through a parallel groove clamp, a long ground wire is arranged at the bottom of the grounding switch box and is connected with a transformer substation grounding grid through a second ground wire, a second isolating switch is arranged in the grounding switch box, the wire inlet end of the second isolating switch is connected with the short-circuit ground wire, and the wire outlet end of the second isolating switch is connected with the long ground wire.

On the basis of the technical scheme, preferably, the mounting bracket comprises a bracket body for fixing the earthing switch box, and a first flat steel hoop, a second flat steel hoop and a third flat steel hoop which are used for fixing the frame rod, two pairs of mounting seats are respectively arranged at the upper end and the lower end of the bracket body, a plurality of adjusting holes are respectively formed in the side walls of the first flat steel hoop, the second flat steel hoop and the third flat steel hoop, one end of the first flat steel hoop and one end of the third flat steel hoop are respectively fixedly connected with the mounting seats, and the other end of the first flat steel hoop and the other end of the third flat steel hoop are connected with the second flat steel hoop through adjusting screws.

On the basis of the technical scheme, preferably, the side wall and the bottom of the grounding switch box are respectively provided with a first waterproof plug used for sealing a short grounding wire and a long grounding wire.

On the basis of the above technical solution, preferably, the grounding switch box is made of an insulating SMC material or an epoxy resin plate.

On the basis of the technical scheme, preferably, the guide protection tube is made of a hot dip galvanized steel tube, an insulation sleeve is sleeved on the OPGW optical cable in the guide protection tube, and a second waterproof plug is arranged at an opening at the upper end of the guide protection tube.

Further, preferably, the lower part of the door-shaped framework is provided with a plurality of protective tube fixing hoops for fixing and guiding the protective tubes.

Further, it is preferred, be provided with cable ditch pond on the bottom surface of surplus cable bottom of the case portion, the guide pillar extends to in the cable ditch pond and the tip is provided with the waterproof end cap of third.

On the basis of the above technical scheme, preferably, the fixing device includes a pin insulator and a holding device, the holding device is respectively and fixedly connected with the gantry frame and the pin insulator, and the OPGW optical cable is fixed at an end of the pin insulator.

Preferably, the clamping device comprises pin-pulling rod hoops which are equidistantly arranged on the upper portion of the gate-shaped framework, U-shaped fixtures which are arranged in the middle of the gate-shaped framework and herringbone rod hoops which are equidistantly arranged on the lower portion of the gate-shaped framework, the pin-pulling rod hoops and the herringbone rod hoops respectively comprise two semicircular hoops and an installation frame, the pin-type insulators are fixed on the installation frame, and the two semicircular hoops are connected through two connecting bolts.

On the basis of the technical scheme, preferably, the pressure limiting device comprises a high-voltage arc striking rod and a low-voltage arc striking rod which are mutually flat, one end of the low-voltage arc striking rod is connected with the high-voltage arc striking rod, a plurality of outer cover umbrella skirts are arranged outside the high-voltage arc striking rod at equal intervals, discharge balls are arranged at the end parts of the high-voltage arc striking rod and the low-voltage arc striking rod, one end of the high-voltage arc striking rod is connected with the door type framework through a pin pulling rod hoop, and the OPGW optical cable is fixed at the other end of the high-voltage arc striking rod.

The utility model discloses following beneficial effect has for prior art:

the utility model discloses a ground device under OPGW optical cable draws, through set up the installing support on the frame pole that is close to guide pillar mouth top, and install the earthing switch box on the installing support, one side of earthing switch box is connected with the short circuit ground wire, the end of short circuit ground wire is connected with the OPGW optical cable of guide pillar mouth top through parallel groove clamp, earthing switch bottom of the case portion is provided with long earth connection, long earth connection passes through the second earth connection and links to each other with the transformer substation's earthing network, be provided with second isolator in the earthing switch box, second isolator's inlet wire end is connected with the short circuit ground wire, second isolator's leading-out terminal and long earth connection are connected. By adopting the technical scheme, when the OPGW optical cable above the guide protective pipe opening swings along with wind pressure and has broken lightning stroke discharge, the current on the OPPGW optical cable is connected with an external transformer substation grounding grid through the short circuit ground wire, the second isolating switch and the long ground wire, so that the OPPGW optical cable is timely released, and the potential hazards of cable burning and strand breakage caused by discharge electrical erosion of the OPGW optical cable due to no grounding measures are avoided. When the OPGW annual insulation supervision of the transformer substation is detected and the resistance of the grounding grid of the transformer substation is measured, all grounding points of the OPGW optical cable can be disconnected only by opening the first isolating switch and the second isolating switch, so that the insulation detection can be accurately carried out, or the resistance is measured, convenience is provided for maintenance personnel, the test time is saved, the power failure loss is reduced, the maintenance is convenient, the pole climbing operation risk is avoided, the labor intensity of operation and maintenance personnel is reduced, and the safety operation reliability and the efficiency of the power grid are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic plan view of an OPGW optical cable grounding device disclosed in the present invention;

fig. 2 is a schematic partial structure diagram of the OPGW optical cable grounding device disclosed in the present invention;

fig. 3 is a schematic structural view of the mounting bracket disclosed in the present invention;

fig. 4 is an external structural schematic diagram of the grounding switch box disclosed in the present invention;

fig. 5 is a schematic view of the internal structure of the grounding switch box disclosed in the present invention;

fig. 6 is a schematic structural view of the pressure limiting device disclosed in the present invention;

FIG. 7 is an enlarged view of the point A in FIG. 1;

FIG. 8 is an enlarged view of the point B in FIG. 1;

fig. 9 is an enlarged schematic view of C in fig. 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in figure 1, combine figure 2, the embodiment of the utility model discloses an OPGW optical cable draws earthing device down, including door type framework 1 and set up the surplus cable case 2 in door type framework 1 bottom, door type framework 1 can make chevron shape or door style of calligraphy. The top of the door-shaped framework 1 is provided with a voltage limiting device 4 for performing voltage limiting discharge on an OPGW optical cable 3, the upper part of the door-shaped framework 1 is provided with a plurality of fixing devices 5 for fixing the OPGW optical cable 3 at equal intervals, the OPGW optical cable 3 at the lower part of the door-shaped framework 1 passes through a guide protection pipe 9 and is connected in a residual cable box 2, an optical cable coiling seat 21 and a first isolating switch 22 for coiling the OPGW optical cable 3 are arranged in the residual cable box 2, the OPGW optical cable 3 is connected with the inlet end of the first isolating switch 22 through a first grounding wire 23 before being coiled to the optical cable coiling seat 21 and before being welded with an ADSS optical cable 6 after being coiled from the optical cable coiling seat 21, the outlet end of the first isolating switch 22 is connected with an external transformer substation grounding network, a mounting bracket 7 is detachably mounted on a framework rod 11 at the lower part of the door-shaped framework 1, a grounding switch box 8 is fixedly mounted on the mounting bracket, one side of the earthing switch box 8 is connected with a short circuit ground wire 81, the tail end of the short circuit ground wire 81 is connected with an OPGW optical cable 3 above the opening of the guide protection pipe 9 through a parallel groove clamp 82, the bottom of the earthing switch box 8 is provided with a long ground wire 83, the long ground wire 83 is connected with an external transformer substation grounding grid through a second ground wire 84, a second isolating switch 85 is arranged in the earthing switch box 8, the wire inlet end of the second isolating switch 85 is connected with the short circuit ground wire 81, and the wire outlet end of the second isolating switch 85 is connected with the long ground wire 83.

By adopting the technical scheme, when the OPGW optical cable 3 is pulled down, the voltage limiting device 4 is arranged at the top of the door-shaped framework 1, the lightning stroke induction electricity and the induction electricity in the transformer substation can be subjected to voltage limiting discharge, reliable grounding is ensured, and the hidden troubles of lightning stroke induction electricity, turn-to-turn discharge electric erosion cable burning and strand breakage of the OPGW optical cable 3 caused by the grounding problem are avoided. After the OPGW optical cable 3 enters the extra cable box 2, before being wound around the optical cable winding seat 21, the current of the OPGW optical cable 3 itself needs to be discharged through the first grounding wire 23 and the first isolating switch 22 and the external substation grounding grid. After the OPGW optical cable 3 is wound on the optical cable coiling seat 21, the first ground wire 23 and the first isolation switch 22 are also required to be discharged from the external substation ground network before being fused with the ADSS optical cable 6 (ordinary cable) due to the induced current. The conventional operation of three-point grounding of the existing transformer substation floor residual cable box 2 is realized. In the prior art, when the OPGW optical cable 3 passes through the guiding protection tube 9 and is connected with the residual cable box 2, and the insulation sleeve 31 above the opening of the guiding protection tube 9 is damaged in the process of wind and sun exposure, a short-circuit ground wire 81 is adopted and is connected with the OPGW optical cable 3 above the opening of the guiding protection tube 9 through the parallel groove clamp 82, the current released by the discharging of the OPGW optical cable 3 passes through the grounding switch box 8 and is conducted with the long grounding wire 83 through the second isolating switch 85, in the present embodiment, the installation is performed, the long grounding wire 83 is connected with the second grounding wire 84 through the wiring terminal 87, the second grounding wire 84 is connected with the external substation grounding grid, and finally, in order to facilitate the discharging of the OPGW optical cable 3 above the opening of the guiding protection tube 9, the discharging is performed with the external substation grounding grid through the long grounding wire 83, the second grounding wire 84, the first isolating switch 22, the hidden troubles of cable burning and strand breakage caused by discharging electrical erosion of the OPGW optical cable 3 due to no grounding measure are avoided. When the OPGW annual insulation supervision of the transformer substation is detected and the resistance of the grounding grid of the transformer substation is measured, all grounding points of the OPGW optical cable can be disconnected only by disconnecting the first isolating switch 22 and the second isolating switch 85, so that the insulation detection can be accurately carried out, or the resistance is measured, convenience is provided for maintenance personnel, the test time is saved, the power failure loss is reduced, the maintenance is convenient, the pole climbing operation risk is avoided, the labor intensity of operation and maintenance personnel is reduced, and the safety operation reliability and efficiency of the power grid are improved.

Specifically, the utility model discloses still realize through following technical scheme:

referring to fig. 3, the mounting bracket 7 includes a bracket body 71 for fixing the earthing switch box 8, and a first flat steel hoop 72, a second flat steel hoop 73 and a third flat steel hoop 74 for fixing the frame member 11, two pairs of mounting seats 75 are respectively disposed at the upper end and the lower end of the bracket body 71, a plurality of adjusting holes 76 are respectively disposed on the side walls of the first flat steel hoop 72, the second flat steel hoop 73 and the third flat steel hoop 74, one end of the first flat steel hoop 72 and one end of the third flat steel hoop 74 are respectively fixedly connected with the mounting seats 75, and the other end of the first flat steel hoop 72 and the other end of the third flat steel hoop 74 are connected with the second flat steel hoop 73 through adjusting screws 77.

By adopting the technical scheme, when the mounting bracket 7 is mounted, the position of the frame rod 11 of the accessory above the opening end of the guide protective pipe 9 is selected, the first flat steel hoop 72, the second flat steel hoop 73 and the third flat steel hoop 74 are connected end to end, the specific operation is that the adjusting screw 77 is inserted into the adjusting hole 76 corresponding to the joint of the first flat steel hoop 72 and the second flat steel hoop 73, the screw rod of the adjusting screw 77 faces outwards to facilitate the nut locking, the adjusting screw 77 is inserted into the adjusting hole 76 corresponding to the joint of the third flat steel hoop 74 and the second flat steel hoop 73, the screw rod of the adjusting screw 77 faces outwards to lock the nut, according to the diameter of the frame rod, when the diameter of the frame rod is larger, the joint position of the first flat steel hoop 72 and the second flat steel hoop 73 is adjusted, and the third flat steel hoop 74 is jointed with the second flat steel hoop 73, the whole flat steel hoop formed after the first flat steel hoop 72, the second flat steel hoop 73 and the third flat steel hoop 74 are connected in a closing mode can be attached to the frame rod 11, finally, the tail ends of the first flat steel hoop 72 and the third flat steel hoop 74 are respectively inserted into the mounting seat 73, and the whole flat steel hoop is firmly fixed on the frame rod 11 through the fixing bolt 78.

When the diameter of the frame rod 11 is small, one end of the first flat steel hoop 72 and one end of the third flat steel hoop 74 can be directly inserted into the mounting seat 73 and locked by the fixing bolt 78, the other ends of the first flat steel hoop 72 and the third flat steel hoop 74 are attached to the frame rod 11 after being bent, and are inserted into the adjusting holes 76 corresponding to the joint of the first flat steel hoop 72 and the third flat steel hoop 74 through the adjusting screws 77 at the joint, so that firm connection is achieved.

The mounting bracket can be suitable for the frame rods within the range of phi 200 mm-phi 500 mm.

Referring to fig. 4 and 5, in the present embodiment, the side wall and the bottom of the earthing switch box 8 are respectively provided with a first waterproof plug 86 for sealing the short earth wire 81 and the long earth wire 83. Through setting up first waterproof end cap 86, can seal fixedly to earthing switch box 8 and short circuit ground wire 81 and long earth connection 83 junction, prevent that the rainwater from infiltrating to earthing switch box 8 in, cause contact failure because of the earthing point corrosion.

Preferably, the grounding switch box 8 is made of an insulating SMC material or an epoxy resin plate. The insulation of the grounding switch box 8 is ensured, and the insulation of the OPGW optical cable 3 is improved.

The guiding protective tube 9 is made of a hot-dip galvanized steel tube, an insulation sleeve 31 is sleeved on the OPGW optical cable 3 in the guiding protective tube 9, and a second waterproof plug 92 is arranged at an opening at the upper end of the guiding protective tube 9. By sleeving the insulation sleeve 31 on the OPGW optical cable 3, the current on the OPGW optical cable 3 can be prevented from being directly conducted with the framework rod 11 through the guiding protective tube 9. The second waterproof plug 92 is arranged at the opening at the upper end of the guide protection tube 9, so that the current of the OPGW optical cable 3 is directly conducted with the framework rod 11 through the guide protection tube 9 under the condition that the OPGW optical cable 3 is damaged at the opening of the guide protection tube 9, and the optical fiber is prevented from being adversely affected by the icing of accumulated water in the guide protection tube.

Furthermore, the lower part of the door-shaped framework 1 is provided with a plurality of protective tube fixing hoops 12 for fixing and guiding the protective tubes 9. The guide protective pipe 9 can be fixed through the protective pipe fixing hoop 12, and the guide protective pipe 9 is prevented from being fixed on the frame rod 11 insecurely.

In this embodiment, a cable trench 24 is provided on the bottom surface of the bottom of the residual cable box 2, the guiding protection tube 9 extends into the cable trench 24, and the end portion is provided with a third water plug 93. The third waterproof plug 93 prevents the OPGW optical cable 3 at the bottom end of the guiding protection tube 9 from easily conducting current with the guiding protection tube 9 under the action of rainwater after the insulating sleeve 31 is aged.

Referring to fig. 7, 8 and 9, in the present embodiment, the fixing device 5 includes a pin insulator 51 and a clasping device 52, the clasping device 52 is fixedly connected to the gantry 1 and the pin insulator 51, respectively, and the OPGW cable 3 is fixed to the end of the pin insulator 51. The holding device 52 is used for fixing with the frame rod 11, and the pin insulator 51 is used for fixing the OPGW optical cable 3, thereby effectively ensuring reliable insulation between the OPGW optical cable 3 and the door type frame 1.

Specifically, the clasping device 52 comprises a pin-pulling rod hoop 521 equidistantly arranged on the upper part of the door-shaped frame 1, a U-shaped fixture 522 arranged in the middle of the door-shaped frame 1, and a herringbone rod hoop 524 equidistantly arranged on the lower part of the door-shaped frame 1, wherein the pin-pulling rod hoop 521 and the herringbone rod hoop 523 both comprise two semicircular hoops and a mounting frame, the pin insulator 51 is fixed on the mounting frame, and the two semicircular hoops are connected through two connecting bolts.

Specifically, the pin insulator 51 is fixed by arranging the tapered rod hoop 521 at the upper part of the portal frame 1, so that the discharge distance between the OPGW optical cable 3 and the frame rod 11 can be increased; on the flange platform in the middle of the door-shaped framework 1, due to the structural limitation of the flange platform, the flange platform can be directly clamped and connected by using the U-shaped clamp 522; the herringbone rod hoop 523 is arranged at the lower part of the door-shaped framework 1 to fix the pin insulator 51, so that the discharge distance between the OPGW optical cable 3 and the framework rod 11 can be reduced.

Referring to fig. 6, in the present embodiment, the voltage limiting device 4 includes a high-voltage arc-striking rod 41 and a low-voltage arc-striking rod 42 that are flat with each other, one end of the low-voltage arc-striking rod 42 is connected to the high-voltage arc-striking rod 41, a plurality of outer umbrella skirts 43 are arranged outside the high-voltage arc-striking rod 41 at equal intervals, the ends of the high-voltage arc-striking rod 41 and the low-voltage arc-striking rod 42 are both provided with discharge balls 44, one end of the high-voltage arc-striking rod 41 is connected to the door frame 1 through a tip-rod hoop 521, and the OPGW optical cable 3 is fixed to the other end of. By adopting the technical scheme, through the voltage limiting device 4 arranged at the top of the portal frame 1, when lightning strike occurs, the OPGW optical cable 3 discharges, so that the ends of the high-voltage arc striking rod 41 and the low-voltage arc striking rod 42 are subjected to discharge breakdown through the discharge ball 44, the current on the OPGW optical cable 3 is conducted to the pin-pulling rod hoop 521 through the high-voltage arc striking rod 41 and the low-voltage arc striking rod 42, and finally, the grounding protection is carried out through the portal frame 1. Avoids the hidden troubles of lightning induction electricity of the OPGW optical cable 3, cable burning caused by interturn discharge and cable breakage caused by the grounding problem.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An OPGW optical cable down-lead grounding device comprises a door-shaped framework (1) and a residual cable box (2) arranged at the bottom of the door-shaped framework (1), wherein a voltage limiting device (4) used for limiting and discharging an OPGW optical cable (3) is arranged at the top of the door-shaped framework (1), a plurality of fixing devices (5) used for fixing the OPGW optical cable are arranged on the upper portion of the door-shaped framework (1) at equal intervals, the OPGW optical cable on the lower portion of the door-shaped framework (1) penetrates through a guiding protective tube (9) and is connected in the residual cable box (2), an optical cable coiling seat (21) and a first isolating switch (22) used for coiling the OPGW optical cable are arranged in the residual cable box (2), the OPGW optical cable is coiled to the optical cable coiling seat (21) and is connected with a wire inlet end of the first isolating switch (22) through a first grounding wire (23) after being coiled to the optical cable and before being welded with an ADSS optical cable (6), the leading-out terminal of first isolator (22) links to each other with outside transformer substation's ground net, its characterized in that: demountable installation has installing support (7) on framework pole (11) of door type framework (1) lower part, fixed mounting has earthing switch case (8) on installing support (7), one side of earthing switch case (8) is connected with short circuit ground wire (81), the end of short circuit ground wire (81) is connected with the OPGW optical cable of guide pillar (9) mouth top through parallel groove fastener (82), and earthing switch case (8) bottom is provided with long earth connection (83), long earth connection (83) link to each other with the transformer substation's earthing network through second earth connection (84), are provided with second isolator (85) in earthing switch case (8), and the inlet wire end and the short circuit ground wire (81) of second isolator (85) are connected, and the outlet terminal and the long earth connection (83) of second isolator (85) are connected.

2. The OPGW cable down-lead grounding assembly of claim 1, wherein: the installing support (7) comprises a support body (71) used for fixing the earthing switch box (8) and a first flat steel hoop (72), a second flat steel hoop (73) and a third flat steel hoop (74) which are used for fixing the frame member (11), wherein two pairs of installing seats (75) are arranged at the upper end and the lower end of the support body (71) respectively, a plurality of adjusting holes (76) are formed in the side walls of the first flat steel hoop (72), the second flat steel hoop (73) and the third flat steel hoop (74), one end of the first flat steel hoop (72) and one end of the third flat steel hoop (74) are fixedly connected with the installing seats (75) respectively, and the other end of the first flat steel hoop (72) and the other end of the third flat steel hoop (74) are connected with the second flat steel hoop (73) through adjusting screws (77).

3. The OPGW cable down-lead grounding assembly of claim 1, wherein: and the side wall and the bottom of the grounding switch box (8) are respectively provided with a first waterproof plug (86) for sealing a short grounding wire (81) and a long grounding wire (83).

4. The OPGW cable down-lead grounding assembly of claim 1, wherein: the grounding switch box (8) is made of insulating SMC materials or epoxy resin plates.

5. The OPGW cable down-lead grounding assembly of claim 1, wherein: the guide protection tube (9) is made of a hot-dip galvanized steel tube, an OPGW optical cable (3) in the guide protection tube (9) is sleeved with an insulating sleeve (31), and a second waterproof plug (92) is arranged at an opening at the upper end of the guide protection tube (9).

6. The OPGW cable down-lead grounding device of claim 5, wherein: the lower part of the door-shaped framework (1) is provided with a plurality of protective tube fixing hoops (12) for fixing and guiding the protective tubes (9).

7. An OPGW optical cable down-lead grounding arrangement as claimed in claim 5 wherein: and a cable trench pool (24) is arranged on the bottom surface of the bottom of the residual cable box (2), the guide protective pipe (9) extends into the cable trench pool (24), and a third waterproof plug (93) is arranged at the end part of the guide protective pipe.

8. The OPGW cable down-lead grounding assembly of claim 1, wherein: the fixing device (5) comprises a pin insulator (51) and a holding device (52), the holding device (52) is fixedly connected with the portal frame (1) and the pin insulator (51) respectively, and the OPGW optical cable is fixed at the end part of the pin insulator (51).

9. The OPGW cable down-lead grounding assembly of claim 8, wherein: the clamping device (52) comprises a pin pulling rod hoop (521) which is equidistantly arranged on the upper portion of the door-shaped framework (1), a U-shaped fixture (522) which is arranged in the middle of the door-shaped framework (1) and a herringbone rod hoop (523) which is equidistantly arranged on the lower portion of the door-shaped framework (1), the pin pulling rod hoop (521) and the herringbone rod hoop (523) respectively comprise two semicircular hoops and an installation frame, the pin insulator (51) is fixed on the installation frame, and the two semicircular hoops are connected through two connecting bolts.

10. The OPGW cable down-lead grounding assembly of claim 9, wherein: the pressure limiting device (4) comprises a high-voltage arc striking rod (41) and a low-voltage arc striking rod (42) which are mutually flat, one end of the low-voltage arc striking rod (42) is connected with the high-voltage arc striking rod (41), a plurality of outer umbrella skirts (43) are arranged outside the high-voltage arc striking rod (41) at equal intervals, discharge balls (44) are arranged at the end parts of the high-voltage arc striking rod (41) and the low-voltage arc striking rod (42), one end of the high-voltage arc striking rod (41) is connected with the door type framework (1) through a tip pulling rod hoop (521), and the OPGW optical cable is fixed at the other end of the high-voltage arc striking rod (41).