CN221886009U - 330kV and above cable user outdoor terminals - Google Patents

Abstract

The utility model discloses an outdoor terminal for cables of 330kV and above, belonging to the field of high-voltage cross-linked power cable accessories, including a bushing, a stress cone bottom plate, a sealing ring and a pressing piece. The bushing is sleeved on the outside of the cable, and an insulating agent is filled between the bushing and the cable. The stress cone is sleeved on the outside of the cable and is located inside the bushing. The bottom plate is installed at the lower end of the bushing. A sealing groove is provided on the bottom plate, and a first through hole for the cable to pass through is provided on the bottom wall of the sealing groove. The sealing ring is installed in the sealing groove, and the sealing ring is sleeved on the cable. The pressing piece is provided with a second through hole for the cable to pass through. The pressing piece is detachably connected to the bottom plate, and the pressing piece abuts against the sealing ring. In the utility model, the pressing piece squeezes the sealing ring so that the sealing ring is tightly connected to the cable and the bottom plate, which can improve the sealing effect of the connection between the bottom plate and the cable, thereby achieving a sealing and leak-proof effect.

Description

330kV and above cable user outdoor terminals

Technical Field

The utility model belongs to the technical field of high-voltage cross-linked power cable accessories, and particularly relates to an outdoor terminal for AC and DC power cables of 330 kV and above (such as 400 kV, 500 kV, 750 kV, 800 kV, etc.).

Background Art

With the development of my country's power construction, the demand for electricity continues to rise, especially with the construction of high-voltage and ultra-high-voltage power grids. The demand for cross-linked polyethylene insulated power cables with voltage levels of 330kV and above is increasing, which also promotes the rapid development of cable accessories. Cable outdoor terminals are the main cable accessories, through which underground cables and high-voltage transmission lines on high-voltage transmission towers are reliably connected. Current cable terminal products include fully dry silicone rubber outdoor terminals and oil-filled terminals, and the oil-filled terminals are widely used. At present, the insulating oil of the oil-filled outdoor terminals is easy to leak. The sealing method to prevent oil leakage mainly uses wrapped waterproof tape and ordinary O-rings. The sealing cannot be guaranteed, and there is a risk of oil leakage at the connection between the base plate and the cable.

Utility Model Content

The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an outdoor terminal for cables of 330kV and above, which solves the problem that the sealing of the existing oil-filled outdoor terminal cannot be guaranteed and the risk of oil leakage easily occurs at the connection between the bottom plate and the cable.

According to the embodiment of the utility model, the 330kV and above cable user's outdoor terminal includes:

A sleeve, which is sleeved on the outside of the cable, and an insulating agent is filled between the sleeve and the cable;

A stress cone is sleeved on the outside of the cable, and the stress cone is located inside the sleeve;

A bottom plate is mounted on the lower end of the sleeve, the bottom plate is provided with a sealing groove, and the bottom wall of the sealing groove is provided with a first through hole for the cable to pass through;

A sealing ring is installed in the sealing groove, and the sealing ring is sleeved on the cable;

A pressing piece is provided with a second through hole for the cable to pass through, the pressing piece is detachably connected to the bottom plate, and the pressing piece abuts against the sealing ring.

According to the 330kV and above cable user outdoor terminal of the embodiment of the utility model, there are at least the following beneficial effects:

Insulating agent is filled between the casing and the cable, which can enhance the insulation strength and prevent creepage or breakdown. A stress cone is provided on the cable, which can improve the electric field distribution and reduce the concentration of electric stress. The pressing piece confines the sealing ring in the sealing groove, and the pressing piece can squeeze the sealing ring so that the sealing ring is tightly connected to the cable and the base plate, thereby improving the sealing effect of the connection between the base plate and the cable, thereby achieving the effect of sealing and leak-proofing.

According to some embodiments of the present invention, the thickness of the sealing ring is greater than the depth of the sealing groove.

According to some embodiments of the present utility model, the pressing piece includes a pressing plate and a connecting tube, the connecting tube is connected to the upper end of the pressing plate, the pressing plate is detachably connected to the bottom plate, and the pressing plate abuts against the sealing ring.

According to some embodiments of the utility model, the lower end of the stress cone and the outer side of the connecting tube are both wrapped and connected with an insulating tape.

According to some embodiments of the utility model, the stress cone and the connecting tube are spaced apart, and the outer side of the cable between the stress cone and the connecting tube is wrapped and connected with an insulating tape.

According to some embodiments of the utility model, the sleeve is in the shape of a straight tube;

Alternatively, the lower end of the sleeve is in the shape of a straight cylinder and the upper end is in the shape of a conical cylinder, and the outer diameter of the upper end of the sleeve gradually decreases in the upward direction.

According to some embodiments of the utility model, the 330kV and above cable user external terminal of the embodiment of the present application also includes a top cover, a terminal post and a pressure cover, the top cover is installed above the bushing, a third through hole is provided on the top cover, the terminal post is electrically connected to the upper end of the cable through the third through hole, a fourth through hole is provided on the pressure cover for the terminal post to pass through, the pressure cover is detachably connected to the top cover, and the pressure cover covers the third through hole.

According to some embodiments of the utility model, the external terminal of the 330kV and above cable user in the embodiment of the present application also includes a tightening ring, the terminal is provided with an external thread, the tightening ring is provided with a threaded hole, and the threaded hole is threadedly connected to the external thread.

According to some embodiments of the present invention, an end of the terminal away from the cable is connected to a lead-out fitting, a shielding ring and a shielding cover are connected to the terminal, and the shielding cover is connected to the top cover.

According to some embodiments of the utility model, a supporting insulator and a tail tube are connected to the bottom plate, the tail tube is sleeved on the cable, and a grounding terminal is provided on the tail tube.

Additional aspects and advantages of the present invention will be partially presented in the following description.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

FIG1 is a schematic structural diagram of an outdoor terminal for cables of 330 kV and above according to an embodiment of the utility model;

FIG2 is an enlarged view of point A in FIG1 ;

FIG3 is a schematic diagram of FIG2 without the sealing ring;

FIG4 is an enlarged view of point B in FIG1 ;

FIG5 is a schematic structural diagram of another 330 kV and above cable user outdoor terminal according to an embodiment of the utility model.

Figure Number:

100, bushing; 110, insulating agent; 120, shed skirt;

200, cable; 210, terminal; 211, gland; 212, tightening ring; 220, outlet fittings;

300, stress cone;

400, bottom plate; 410, sealing groove; 411, sealing ring; 420, first through hole; 430, supporting insulator; 440, tail pipe; 441, grounding terminal;

500, pressing member; 510, pressing plate; 520, connecting tube;

600, insulating tape;

700, top cover; 710, shielding cover; 720, shielding ring.

DETAILED DESCRIPTION

The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Please refer to Figures 1, 2 and 3. The 330kV and above cable user outdoor terminal of the embodiment of the utility model includes a bushing 100, a stress cone 300, a bottom plate 400, a sealing ring 411 and a pressing piece 500. The bushing 100 is sleeved on the outside of the cable 200, and an insulating agent 110 is filled between the bushing 100 and the cable 200. The stress cone 300 is sleeved on the outside of the cable 200, and the stress cone 300 is located inside the bushing 100. The bottom plate 400 is installed at the lower end of the bushing 100, and a sealing groove 410 is provided on the bottom plate 400. A first through hole 420 is provided on the bottom wall of the sealing groove 410, and the first through hole 420 is used for the cable 200 to pass through. The sealing ring 411 is installed in the sealing groove 410, and the sealing ring 411 is sleeved on the cable 200. The compression piece 500 is provided with a second through hole for the cable 200 to pass through. The compression piece 500 is detachably connected to the bottom plate 400, and the compression piece 500 abuts against the sealing ring 411. The compression piece 500 is connected to the bottom plate 400 by bolts. As the bolts connecting the compression piece 500 and the bottom plate 400 are tightened, the sealing ring 411 is also compressed, thereby increasing the interface pressure with the cable 200, thereby enhancing the sealing effect.

An insulating agent 110 is filled between the sleeve 100 and the cable 200. The sleeve 100 and the insulating agent 110 can enhance the insulation strength and prevent creepage or breakdown. A stress cone 300 is sleeved on the cable 200. The stress cone 300 can improve the electric field distribution and reduce the concentration of electric stress. The compression piece 500 restricts the sealing ring 411 in the sealing groove 410. The compression piece 500 can squeeze the sealing ring 411 so that the sealing ring 411 is tightly connected with the cable 200 and the bottom plate 400, thereby improving the sealing effect of the connection between the bottom plate 400 and the cable 200, thereby achieving a sealing and leak-proof effect.

In some embodiments, referring to Figures 1, 2 and 3, the thickness of the sealing ring 411 is greater than the depth of the sealing groove 410. As the bolts connecting the pressing piece 500 and the base plate 400 are tightened, the sealing ring 411 will also be compressed, and the sealing ring 411 will contact the inner wall of the sealing groove 410 more closely, thereby increasing the interface pressure with the cable 200 and enhancing the sealing effect.

In some embodiments, referring to FIG. 1 , FIG. 2 and FIG. 3 , the pressing member 500 includes a pressing plate 510 and a connecting tube 520, the connecting tube 520 is connected to the upper end of the pressing plate 510, the pressing plate 510 is detachably connected to the bottom plate 400, and the pressing plate 510 abuts against the sealing ring 411. The pressing plate 510 is connected to the bottom plate 400 by bolts. As the bolts connecting the pressing plate 510 and the bottom plate 400 are tightened, the sealing ring 411 is also compressed, and the sealing ring 411 is more closely in contact with the inner wall of the sealing groove 410, thereby increasing the interface pressure with the cable 200 and enhancing the sealing effect. The connecting tube 520 is a straight tube, the connecting tube 520 can play a sealing role, and can also straighten the cable 200 to prevent the cable 200 from bending. The connecting tube 520 can also form an equipotential to improve the electric field distribution.

In some embodiments, referring to Figures 1, 2 and 3, the lower end of the stress cone 300 and the outer side of the connecting tube 520 are wrapped with an insulating tape 600. The insulating tape 600 can enhance the insulation strength, prevent breakdown, and isolate the insulating agent 110 from the cable 200 to prevent the surface of the cable 200 from being corroded.

In some embodiments, referring to Figures 1, 2 and 3, the stress cone 300 is spaced apart from the connecting tube 520, and an insulating tape 600 is wrapped and connected to the outer side of the cable 200 between the stress cone 300 and the connecting tube 520. The insulating tape 600 can enhance the insulation strength, prevent breakdown, and isolate the insulating agent 110 from the cable 200 to prevent the surface of the cable 200 from being corroded.

By configuring a series of structures such as stress cone 300, insulating tape 600, pressing piece 500, sealing ring 411 on the surface of cable 200, the electric field distribution can be improved and the electric stress concentration can be reduced. At the same time, the multiple sealing structures ensure a better sealing effect, so that the insulating agent 110 will not easily leak, explode, etc., causing property loss or accident risks.

In some embodiments, referring to FIG. 1 , FIG. 2 and FIG. 3 , the bushing 100 may be a composite bushing 100 , and a bushing 100 made of silicone rubber or glass fiber impregnated with epoxy resin is used as the insulating bushing 100 of the outdoor terminal. The composite bushing 100 has a high insulation strength, which can effectively prevent voltage leakage and ensure the safe and reliable operation of the equipment. The composite bushing 100 can withstand high temperature environments and can work normally in harsh environments such as high altitude, high temperature, and humidity. The composite bushing 100 has high tensile and bending strengths and can withstand large pressure and deformation.

In some embodiments, referring to FIG. 1 , FIG. 2 and FIG. 5 , the bushing 100 may also be a porcelain bushing 100. The porcelain bushing 100 has multiple advantages such as corrosion resistance, fire resistance, explosion resistance and waterproofness. The porcelain bushing 100 is made of high-insulation material, has high insulation performance and isolation ability, and can effectively prevent the occurrence of electrical accidents. The porcelain bushing 100 has good sealing performance and waterproof and dustproof effects, and can protect electrical equipment from dust and moisture. The porcelain bushing 100 adopts a modular design, which is simple and convenient to install, and the installation work can be completed quickly. The porcelain bushing 100 has a smooth surface and is easy to clean and maintain.

In some embodiments, referring to Figures 1, 2 and 3, the sleeve 100 is in a straight tube shape, and the outer wall is provided with sheds 120 of different sizes arranged alternately, and the sheds 120 have a good dustproof and waterproof effect. The sleeve 100 has a simple structure and is more convenient to install.

In some embodiments, referring to Figures 1, 2, 3 and 4, the lower end of the sleeve 100 is straight and the upper end is conical, and the outer diameter of the upper end of the sleeve 100 gradually decreases in the upward direction, and the outer wall is provided with sheds 120 of alternating sizes, and the sheds 120 have good dustproof and waterproof effects. The sleeve 100 has a simple structure and is more convenient to install.

In some embodiments, referring to FIG. 1 , FIG. 2 and FIG. 4 , the 330 kV and above cable user external terminal of the embodiment of the present application further includes a top cover 700, a terminal 210 and a gland 211. The top cover 700 is installed above the bushing 100, and a third through hole is provided on the top cover 700. The terminal 210 passes through the third through hole and is electrically connected to the upper end of the cable 200. The gland 211 is provided with a fourth through hole for the terminal 210 to pass through. The gland 211 is detachably connected to the top cover 700, and the gland 211 covers the third through hole. The top cover 700 can seal the inside of the bushing 100, isolate the air, and prevent the insulating agent 110 from deteriorating. The top terminal 210 of the cable 200 is exposed from the bushing 100 by a certain distance, which is convenient for the subsequent installation of the top parts.

In some embodiments, referring to FIG. 1, FIG. 2 and FIG. 4, the 330kV and above cable user external terminal of the embodiment of the present application further includes a tightening ring 212, the terminal 210 is provided with an external thread, the tightening ring 212 is provided with a threaded hole, and the threaded hole is threadedly connected with the external thread. The tightening ring 212 is connected with the gland 211 by bolts, and the gland 211 is driven away from the tightening ring 212 by adjusting the bolts on the tightening ring 212, so that the terminal 210 moves relative to the gland 211 along the axial direction of the terminal 210, and the terminal 210 drives the cable 200 to move. After determining that the cable 200 reaches the specified position, the gland 211 is fixed to the top cover 700 by bolt connection, thereby limiting the displacement of the cable 200 and fixing the position of the cable 200.

In some embodiments, referring to Figures 1, 2 and 4, the end of the terminal 210 away from the cable 200 is connected to the outlet fitting 220. The terminal 210 can connect the conductor of the cable 200 with the outlet fitting 220 to make the circuit conductive, and the outlet fitting 220 can connect the terminal 210 with the high-voltage overhead line to make the circuit conductive.

In some embodiments, referring to FIG. 1 , FIG. 2 and FIG. 4 , a shielding ring 720 and a shielding cover 710 are connected to the terminal 210, and the shielding cover 710 is connected to the top cover 700. The shielding ring 720 can evenly distribute the electric field, shield the discharge between metal parts, and prevent creepage or breakdown. The shielding cover 710 can shield the internal structure and protect the internal structure from corrosion.

In some embodiments, referring to FIG. 1 , FIG. 2 and FIG. 3 , a support insulator 430 and a tail tube 440 are connected to the bottom plate 400, and the tail tube 440 is sleeved on the cable 200, and a grounding terminal 441 is provided on the tail tube 440. The support insulator can support the main body of the outdoor terminal and insulate and isolate the outdoor terminal from the fixed bracket. The bottom plate 400 can support the outdoor terminal and position the sleeve 100. The tail tube 440 can protect the cable 200 and the terminal, and prevent moisture outside the joint from entering the terminal. The grounding terminal 441 is connected to the grounding cable 200, and serves to lead the metal sheath of the cable 200 out of the grounding to avoid damage to equipment and personnel.

The assembly method of the external terminal of the 330kV and above cables in the embodiment of the present application is as follows:

The outer sheath of the cable 200 is stripped off, and then heated and straightened. Then the insulation layer and the semi-conductive layer in the middle of the head of the cable 200 are stripped off to expose a certain length of the conductor. Then the terminal 210 is crimped onto the exposed conductor at the end of the cable 200.

Then, the supporting insulator is installed on the fixing bracket, and the base plate 400 is hoisted on the supporting insulator and fixedly connected with the supporting insulator by nuts.

The cable 200 is inserted into the first through hole 420 on the bottom plate 400, and the cable 200 passes through the sealing ring 411, which is installed in the sealing groove 410. The cable 200 passes through the second through hole of the pressing member 500, and the pressing plate 510 presses on the sealing rubber ring and is fixedly connected to the bottom plate 400 by bolts. The surface of the cable 200 with a certain length below the exposed conductor is then processed, and then the stress cone 300 is mounted on the cable 200.

The lower straight tube part of the stress cone 300, the exposed cable 200 part at the lower end of the stress cone 300 and the outside of the connecting tube 520 are all wrapped with an insulating tape 600. Then the sleeve 100 is hoisted onto the cable 200, and the sleeve 100 is connected to the bottom plate 400 by bolts.

The insulating agent 110 is poured into the bushing 100 from the top. After the insulating agent 110 is poured, the top cover 700 is fixed to the upper flange surface of the bushing 100 by bolts.

The gland 211 and the tightening ring 212 are inserted into the terminal 210, the gland 211 is interference-connected with the terminal 210, the tightening ring 212 is threadedly connected with the terminal 210, the tightening ring 212 is bolted to the gland 211, and the gland 211 is bolted to the top cover 700. By adjusting the bolts on the tightening ring 212, the gland 211 is driven away from the tightening ring 212, the lower surface of the gland 211 abuts against the top cover 700, and the tightening ring 212 is threadedly connected to the terminal 210, so that the terminal 210 moves relative to the gland 211 along the axial direction of the terminal 210, and the terminal 210 drives the cable 200 to move. After determining that the cable 200 reaches the specified position, the gland 211 is fixed to the top cover 700 by bolting, thereby limiting the displacement of the cable 200 and fixing the position of the cable 200.

The shielding cover 710 is fixed to the top cover 700 by bolts. Then the center of the shielding ring 720 is aligned with the terminal 210, and the shielding ring 720 is placed on the shielding cover 710. Then the metal fitting is crimped on the top of the terminal 210.

Correct the cable 200 to ensure that it is in the center of the tail pipe 440, fix the tail pipe 440 to the bottom of the base plate 400 by bolts, and finally fix the ground terminal 441 to the grounding column of the tail pipe 440 by bolts.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. A 330kV and above cable user terminal, characterized by comprising: A sleeve, which is sleeved on the outside of the cable, and an insulating agent is filled between the sleeve and the cable; A stress cone is sleeved on the outside of the cable, and the stress cone is located inside the sleeve; A bottom plate is mounted on the lower end of the sleeve, the bottom plate is provided with a sealing groove, and the bottom wall of the sealing groove is provided with a first through hole for the cable to pass through; A sealing ring is installed in the sealing groove, and the sealing ring is sleeved on the cable; A pressing piece is provided with a second through hole for the cable to pass through, the pressing piece is detachably connected to the bottom plate, and the pressing piece abuts against the sealing ring. 2. The 330 kV and above cable user terminal according to claim 1, characterized in that the thickness of the sealing ring is greater than the depth of the sealing groove. 3. The 330kV and above cable user outdoor terminal according to claim 1 is characterized in that the pressing piece includes a pressing plate and a connecting tube, the connecting tube is connected to the upper end of the pressing plate, the pressing plate is detachably connected to the bottom plate, and the pressing plate abuts against the sealing ring. 4. The 330 kV and above cable user outdoor terminal according to claim 3, characterized in that the lower end of the stress cone and the outer side of the connecting tube are both wrapped and connected with an insulating tape. 5. The 330 kV and above cable user outdoor terminal according to claim 4 is characterized in that the stress cone and the connecting tube are arranged at intervals, and the outer side of the cable between the stress cone and the connecting tube is wrapped and connected with an insulating tape. 6. The 330kV and above cable user terminal according to claim 1, characterized in that the bushing is in a straight tube shape; Alternatively, the lower end of the sleeve is in the shape of a straight cylinder and the upper end is in the shape of a conical cylinder, and the outer diameter of the upper end of the sleeve gradually decreases in the upward direction. 7. The 330kV and above cable user outdoor terminal according to claim 1 is characterized in that it also includes a top cover, a terminal post, a gland and a tightening ring, the top cover is installed above the bushing, a third through hole is provided on the top cover, the terminal post is electrically connected to the upper end of the cable through the third through hole, a fourth through hole is provided on the gland for the terminal post to pass through, the gland is detachably connected to the top cover, the terminal post is provided with an external thread, the tightening ring is provided with a threaded hole, and the threaded hole is threadedly connected to the external thread. 8. The 330 kV and above cable user outdoor terminal according to claim 7, characterized in that an outlet fitting is connected to the end of the terminal away from the cable. 9. The 330 kV and above cable user outdoor terminal according to claim 7, characterized in that a shielding ring and a shielding cover are connected to the terminal post, and the shielding cover is connected to the top cover. 10. The 330 kV and above cable user outdoor terminal according to claim 1, characterized in that a supporting insulator and a tail tube are connected to the bottom plate, the tail tube is sleeved on the cable, and a grounding terminal is provided on the tail tube.