CN220041515U

CN220041515U - Middle junction box end cover of outdoor capacitive voltage transformer

Info

Publication number: CN220041515U
Application number: CN202320740910.8U
Authority: CN
Inventors: 王涛; 罗小鹏; 陈礼鹏
Original assignee: China Yangtze Power Co Ltd
Current assignee: China Yangtze Power Co Ltd
Priority date: 2023-04-06
Filing date: 2023-04-06
Publication date: 2023-11-17
Anticipated expiration: 2033-04-06

Abstract

The utility model provides an end cover of a middle transformer junction box of an outdoor capacitive voltage transformer, which comprises a sealing cover arranged on one side of the junction box, wherein the sealing cover comprises a bottom plate, the bottom plate is connected with the junction box through screws, a bulge is arranged on one side of the bottom plate, a drying agent is arranged in the bulge, an insulating plate is arranged on the bottom plate, a plurality of air holes are formed in the insulating plate, the insulating plate is used for being matched with the bulge to form a constraint space, an epitaxial plate and a sealing plate are arranged on the other side of the bottom plate, and a sealing ring is arranged between the junction box and the sealing cover. The utility model has compact structure, can greatly improve the moisture-proof capacity of the junction box and ensures the safe and stable operation of the power equipment.

Description

Middle junction box end cover of outdoor capacitive voltage transformer

Technical Field

The utility model relates to the technical field of power equipment, in particular to an end cover of a middle transformer junction box of an outdoor capacitive voltage transformer.

Background

In an electric power system, a capacitive voltage transformer is an important component of power transmission and transformation equipment, and is commonly used for power transmission and transformation line access points of power stations, transformer substations, converter stations and the like. The capacitive voltage transformer is an important electric energy monitoring device, and converts primary side voltage of a high voltage level into low voltage which can be directly used by secondary side devices such as protection, metering and the like through a capacitive voltage division principle. The common capacitive voltage transformer mainly comprises a circuit connection hardware fitting, a multi-stage voltage dividing capacitor, an intermediate transformer, secondary wiring, a foundation support post and the like. In order to facilitate the test and inspection of the accuracy of the measurement of the capacitive voltage transformer during the long-term operation and the insulation condition of the intermediate transformer, during the manufacture of the transformer, the intermediate transformer body is often installed in an oil tank, and a plurality of intermediate taps with different transformation ratios and the primary winding grounding end of the transformer are led out to the junction box for separate grounding through a wiring board installed on the side wall of the oil tank.

At present, a wiring board used for leading out an intermediate variable tap and a primary winding grounding end in the power industry is usually made of a polar insulating material, and the wiring board body is easy to be wetted under the condition of high humidity. Meanwhile, the capacitive voltage transformer is used as outdoor equipment and works in the working condition of severe outdoor temperature and humidity change for a long time. The end cover of the existing intermediate transformer junction box is tightly sealed through a rubber sealing ring and a bolt, and when the end cover is subjected to rain or sudden temperature reduction and the like, the conditions that the transformer tap and the primary tail and other wiring are affected with moisture and insulation are reduced due to the fact that the sealing is not tight and the temperature and humidity change is severe often occur. This situation continues to develop, which then causes the entire intermediate insulation to become wet, deteriorate and even breakdown burn out.

The end cover of the middle transformer junction box of the existing voltage transformer has insufficient moistureproof capability for middle transformer in the long-term use process, which can cause the middle transformer junction to be damped and deteriorated, and influence the normal operation of the capacitor voltage transformer.

Disclosure of Invention

The utility model provides an end cover of a middle transformer junction box of an outdoor capacitive voltage transformer, which solves the problems of poor overall dampproof effect and inconvenient assembly, disassembly and maintenance.

In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides an outdoor capacitance type voltage transformer middle junction box end cover that becomes, is including setting up the sealed lid in junction box one side, and sealed lid includes the bottom plate, and the bottom plate passes through the screw and is connected with the junction box, and bottom plate one side is equipped with the arch, is equipped with the drier in the arch, installs the insulation board on the bottom plate, is equipped with a plurality of bleeder vents on the insulation board, and the insulation board is used for cooperating the arch to form the constraint space, and the bottom plate opposite side is equipped with extension board and closing plate, is equipped with the sealing washer between junction box and the sealed lid.

In the preferred scheme, be equipped with a plurality of first screw holes along the axial on the junction box, be equipped with a plurality of first through-holes along the circumference on the bottom plate, the screw wears to establish in first screw hole and first through-hole.

In the preferred scheme, be equipped with the recess on the junction box, first screw hole is located the recess.

In the preferred scheme, be equipped with a plurality of heavy grooves along the axial on the bottom plate, be equipped with the third screw hole in the heavy groove, the insulation board passes through the gasket and is connected with the bottom plate, and the screw wears to establish in third screw hole and gasket, and the gasket is located heavy inslot.

In the preferred scheme, be equipped with a plurality of second screw holes along circumference on the insulation board, the symmetry is equipped with two second through-holes on the gasket, and the screw wears to establish in second screw hole and second through-hole.

In the preferred scheme, the outer side of the second through hole is provided with an arc, and the shape of the arc is matched with that of the sinking groove.

In the preferred scheme, be equipped with a plurality of heavy grooves along the axial on the bottom plate, be equipped with a plurality of gaskets along the circumference on the insulation board, the gasket is located heavy inslot, and the arch is last detachable to be equipped with the locking ring, and the locking ring supports and leans on the outside of insulation board.

In the preferred scheme, sealed lid and locking ring threaded connection, the locking ring outside is equipped with the second screw thread, and protruding inboard is equipped with first screw thread, and second screw thread and first screw thread revolve to the same.

In a preferred scheme, a plurality of alignment holes are formed in the locking ring.

In a preferred embodiment, a partition plate is provided at the bottom of the sealing plate.

The beneficial effects of the utility model are as follows: through setting up outer lapping plate and closing plate on sealed cover to set up the drier in protruding, and separate with the insulation board, the sealing and the dampproof property of change terminal box end in the middle of the very big degree has improved the mutual-inductor, improves power equipment operation security, adjusts through observing the colour state of drier during the maintenance, guarantees that the drier is in the better state of effect, and whole ann tears convenience open, and to outdoor capacitive voltage transformer, can reform transform under the condition of reforming transform to the mutual-inductor body, and the project implementation degree of difficulty is low.

Drawings

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is a schematic view of the overall structure of the present utility model;

FIG. 2 is a schematic view of an exploded view of an embodiment of the present utility model;

FIG. 3 is a schematic view of an explosion structure in a second state according to the first embodiment of the present utility model;

FIG. 4 is a schematic view of a second embodiment of the present utility model in a first explosive configuration;

FIG. 5 is a schematic view of a second explosive structure according to a second embodiment of the present utility model;

fig. 6 is a schematic view of an exploded structure of the insulating plate mounting pad of fig. 1.

In the figure: a junction box 1; a groove 101; a first threaded hole 102; a seal ring 2; an insulating plate 3; a second threaded hole 301; a ventilation hole 302; a desiccant 4; a sealing cover 5; a protrusion 501; a base plate 502; an epitaxial plate 503; a partition 504; a first through hole 505; sink 506; a sealing plate 507; a third threaded bore 508; a first thread 509; a screw 6; a spacer 7; arc 701; a second through hole 702; a lock ring 8; a second thread 801; alignment holes 802.

Detailed Description

Example 1

1-3, an outdoor capacitance type voltage transformer middle transformer junction box end cover comprises a sealing cover 5 arranged on one side of a junction box 1, the sealing cover 5 comprises a bottom plate 502, the bottom plate 502 is connected with the junction box 1 through a screw 6, a boss 501 is arranged on one side of the bottom plate 502, a drying agent 4 is arranged in the boss 501, an insulating plate 3 is arranged on the bottom plate 502, a plurality of ventilation holes 302 are formed in the insulating plate 3, the insulating plate 3 is used for being matched with the boss 501 to form a constraint space, an extension plate 503 and a sealing plate 507 are arranged on the other side of the bottom plate 502, and a sealing ring 2 is arranged between the junction box 1 and the sealing cover 5. From this structure to make the simple to operate of junction box 1 and sealed lid 5, drier 4 can carry out the drying of air to junction box 1 of insulation board 3 one side, and epitaxial plate 503 and closing plate 507 can be better protect junction box 1 and sealed lid 5 junction simultaneously, the moist problem that the response rain wash that can be better and cooling change brought. The epitaxial plate 503 is connected with the sealing plate 507 to form an inverted L shape, when equipment is subjected to rain, the epitaxial plate 503 can block the sealing ring of which the rainwater is directly wetted and is semicircular, meanwhile, the sealing plate 507 is favorable for dripping raindrops along a position away from the sealing ring, the raindrops are prevented from wetting the plane sealing ring 2, the drying and moisture absorption effects can be ensured through the air holes 302, and meanwhile, the color change of the drying agent 4 can be observed. The sealing ring 2 is made of ethylene propylene diene monomer rubber, has the characteristic of good durability and has the thickness of 7mm, and is of a structure, so that the weight of the end cover is controllable, and meanwhile, the moisture is prevented from being accumulated in the sealing surface due to surface tension after the equipment is subjected to rain.

In a preferred embodiment, the junction box 1 is provided with a plurality of first threaded holes 102 along the axial direction, the bottom plate 502 is provided with a plurality of first through holes 505 along the circumferential direction, and the screws 6 are inserted into the first threaded holes 102 and the first through holes 505. From this structure to make can be quick install and remove, reform transform the convenience, the implementation degree of difficulty is low.

In a preferred embodiment, the junction box 1 is provided with a groove 101, and the first threaded hole 102 is located in the groove 101. With this structure, so that a better sealing effect can be obtained, the groove 101 plays a role of extending the contact surface.

In a preferred scheme, a plurality of sinking grooves 506 are axially formed in the bottom plate 502, third threaded holes 508 are formed in the sinking grooves 506, the insulating plate 3 is connected with the bottom plate 502 through the gaskets 7, the screws 6 penetrate through the third threaded holes 508 and the gaskets 7, and the gaskets 7 are located in the sinking grooves 506. With this structure, the gasket 7 can be connected with the bottom plate 502 quickly, and the insulating plate 3 can be prevented from occupying a large space of the bottom plate 502.

As shown in fig. 4, in a preferred embodiment, a plurality of second threaded holes 301 are circumferentially formed in the insulating plate 3, two second through holes 702 are symmetrically formed in the gasket 7, and the screws 6 are inserted into the second threaded holes 301 and the second through holes 702. From this structure to make whole ann tear convenience open, gasket 7 is as the extension of insulation board 3, has spacing and the function of support, and gasket 7 simple manufacture wholly supports effectually, stable in structure.

In a preferred scheme, an arc 701 is arranged outside the second through hole 702, and the shape of the arc 701 is matched with that of the sinking groove 506. With this structure, the whole processing is convenient, and the sinking groove 506 can limit and restrain the gasket 7.

Example 2

In a preferred embodiment, as shown in fig. 5-6, a plurality of sinking grooves 506 are axially formed on the bottom plate 502, a plurality of gaskets 7 are circumferentially formed on the insulating plate 3, the gaskets 7 are located in the sinking grooves 506, locking rings 8 are detachably arranged on the protrusions 501, and the locking rings 8 are abutted against the outer side of the insulating plate 3. With this structure, the locking ring 8 can be used for rapidly mounting and limiting the insulating plate 3, and the whole structure is stable.

In a preferred scheme, the sealing cover 5 is in threaded connection with the locking ring 8, a second thread 801 is arranged on the outer side of the locking ring 8, a first thread 509 is arranged on the inner side of the protrusion 501, and the second thread 801 and the first thread 509 have the same rotation direction. From this structure to make locking ring 8 and sealed lid 5 connect stably, install and remove conveniently, whole effectual.

In a preferred embodiment, the locking ring 8 is provided with a plurality of alignment holes 802. With this structure, the rod can be conveniently screwed by being detached from the alignment hole 802, and the use is simple.

In a preferred embodiment, the bottom of the sealing plate 507 is provided with a spacer 504. With this structure, the overall sealability can be further improved.

The above embodiments are only preferred embodiments of the present utility model, and should not be construed as limiting the present utility model, and the scope of the present utility model should be defined by the claims, including the equivalents of the technical features in the claims. I.e., equivalent replacement modifications within the scope of this utility model are also within the scope of the utility model.

Claims

1. An outdoor capacitance type voltage transformer middle transformer junction box end cover is characterized in that: including setting up sealed lid (5) in terminal box (1) one side, sealed lid (5) include bottom plate (502), bottom plate (502) are connected through screw (6) and terminal box (1), bottom plate (502) one side is equipped with arch (501), be equipped with drier (4) in arch (501), install insulation board (3) on bottom plate (502), be equipped with a plurality of bleeder vents (302) on insulation board (3), insulation board (3) are used for cooperating protruding (501) to form the constraint space, bottom plate (502) opposite side is equipped with epitaxial plate (503) and closing plate (507), be equipped with sealing washer (2) between terminal box (1) and sealed lid (5).

2. The intermediate transformer junction box end cap of an outdoor capacitive voltage transformer of claim 1, wherein: a plurality of first threaded holes (102) are axially formed in the junction box (1), a plurality of first through holes (505) are circumferentially formed in the bottom plate (502), and screws (6) are arranged in the first threaded holes (102) and the first through holes (505) in a penetrating mode.

3. The intermediate transformer junction box end cap of an outdoor capacitive voltage transformer of claim 2, wherein: a groove (101) is formed in the junction box (1), and the first threaded hole (102) is formed in the groove (101).

4. The intermediate transformer junction box end cap of an outdoor capacitive voltage transformer of claim 1, wherein: a plurality of sinking grooves (506) are axially formed in the bottom plate (502), third threaded holes (508) are formed in the sinking grooves (506), the insulating plates (3) are connected with the bottom plate (502) through gaskets (7), screws (6) penetrate through the third threaded holes (508) and the gaskets (7), and the gaskets (7) are located in the sinking grooves (506).

5. The intermediate transformer junction box end cap of an outdoor capacitive voltage transformer of claim 4, wherein: a plurality of second threaded holes (301) are formed in the insulating plate (3) along the circumferential direction, two second through holes (702) are symmetrically formed in the gasket (7), and the screws (6) are arranged in the second threaded holes (301) and the second through holes (702) in a penetrating mode.

6. The intermediate transformer junction box end cap of an outdoor capacitive voltage transformer of claim 5, wherein: and an arc (701) is arranged outside the second through hole (702), and the shape of the arc (701) is matched with that of the sinking groove (506).

7. The intermediate transformer junction box end cap of an outdoor capacitive voltage transformer of claim 1, wherein: a plurality of sinking grooves (506) are axially formed in the bottom plate (502), a plurality of gaskets (7) are circumferentially arranged on the insulating plate (3), the gaskets (7) are located in the sinking grooves (506), locking rings (8) are detachably arranged on the protrusions (501), and the locking rings (8) are abutted to the outer sides of the insulating plate (3).

8. The intermediate transformer junction box end cap of claim 7, wherein: the sealing cover (5) is in threaded connection with the locking ring (8), a second thread (801) is arranged on the outer side of the locking ring (8), a first thread (509) is arranged on the inner side of the protrusion (501), and the second thread (801) and the first thread (509) are identical in screwing direction.

9. The intermediate transformer junction box end cap of an outdoor capacitive voltage transformer of claim 8, wherein: the locking ring (8) is provided with a plurality of alignment holes (802).

10. The intermediate transformer junction box end cap of an outdoor capacitive voltage transformer of claim 1, wherein: a partition plate (504) is arranged at the bottom of the sealing plate (507).