CN206022653U - A kind of end shield earthing or grounding means of sleeve pipe Leakage Current signal extraction - Google Patents

Abstract

The utility model discloses an end-screen grounding device for extracting casing leakage current signals, which comprises a ground cover, an end-screen grounding copper column, an insulating porcelain sleeve, a copper sleeve, a columnar copper core, a blind hole at the bottom of the copper sleeve, and a columnar copper core. It is connected with the top of the blind hole through a spring; the copper sleeve and the cylindrical copper core are covered with an insulating sleeve, and the outer side of the insulating sleeve is provided with a metal sleeve; the cylindrical copper core is provided with a boss, and the inner bottom of the metal sleeve is provided with an insulating convex sleeve , an insulating gasket is provided on the outer surface of the metal sleeve; a first sealing ring is provided between the ground cover and the metal sleeve, a second sealing ring is provided on the contact surface between the insulating boss and the metal sleeve, and the insulating gasket and the metal sleeve A third sealing ring is arranged on the contact surface of the metal sleeve. The utility model is used to solve the problem in the prior art that the last screen grounding device is easily poorly sealed and causes the last screen to be damp, so as to achieve the purpose of ensuring the insulation effect and improving the sealing performance at the same time.

Description

A terminal screen grounding device for extracting bushing leakage current signal

technical field

The utility model relates to the field of end screen grounding, in particular to an end screen grounding device for extracting casing leakage current signals.

Background technique

At present, with the development of smart grid and power grid status intelligent maintenance system, the online monitoring technology of power grid is more and more widely used. The online monitoring of the bushing leakage current can reflect the leakage current, dielectric loss and capacitance of the bushing in real time during operation, and detect the bushing defect in time, which can effectively avoid the main transformer failure caused by the bushing fault. During operation, the end screen of the bushing is directly connected to the end screen cover and the ground through the end screen grounding copper column. At present, how to extract the leakage current of the bushing while achieving a good sealing effect is a difficult point in the on-line monitoring technology of the leakage current of the bushing. If the seal is not good, it is very easy to cause the end screen to be damp. If the insulation effect is not good, the leakage current signal cannot be reliably extracted, which not only causes misjudgment of online monitoring, but may even cause discharge of the end screen due to poor contact.

Utility model content

The purpose of the utility model is to provide an end screen grounding device for extracting casing leakage current signals to solve the problem in the prior art that the end screen grounding device is easy to be poorly sealed and cause the end screen to be damp, so as to ensure the insulation effect and improve the sealing performance at the same time the goal of.

The utility model is realized through the following technical solutions:

An end-screen grounding device for extracting bushing leakage current signals, comprising a ground cover, an end-screen grounding copper post passing through the ground cover, and an insulating porcelain sleeve surrounding the end-screen grounding copper post, and a copper sleeve is provided at the lower end of the end-screen grounding copper post , the lower end of the copper sleeve is connected to the columnar copper core, the bottom of the copper sleeve is provided with a blind hole, the columnar copper core is inserted into the blind hole, and the columnar copper core is connected to the top of the blind hole by a spring; the columnar copper core is also provided with a pin hole, The lower end of the copper sleeve is provided with a pin groove matching the pin hole, and the columnar copper core and the copper sleeve are connected by the pins inserted into the pin hole and the pin slot; A metal sleeve is provided on the outside of the insulating sleeve, and the metal sleeve is threadedly connected to the ground cover; the columnar copper core passes out to the outside of the metal sleeve; the part of the columnar copper core located in the blind hole is also provided with a ring The boss, the inner bottom surface of the metal sleeve covers the columnar copper core through the insulating convex sleeve, and the outer surface of the metal sleeve covers the columnar copper core passing through the metal sleeve through the insulating gasket; the ground cover and the metal sleeve A first sealing ring is arranged between them, a second sealing ring is arranged on the contact surface between the insulating boss and the metal sleeve, and a third sealing ring is arranged on the contact surface between the insulating gasket and the metal sleeve.

Aiming at the problem that the final screen grounding device in the prior art is easy to be poorly sealed and causes the final screen to be damp, the utility model proposes a terminal screen grounding device for extracting casing leakage current signals. The device comprises the existing grounding cover, the grounding copper column of the last screen, and the insulating porcelain sleeve. The lower end of the grounding copper column of the last screen is provided with a copper sleeve, and the lower end of the copper sleeve is connected with a columnar copper core. The copper sleeve is used to maintain the electrical connection between the last screen grounding copper column and the columnar copper core, so as to ensure the normal flow of current. The copper sleeve is preferably a cylindrical structure, the blind hole is located at the bottom of the copper sleeve, and the columnar copper core is inserted into the blind hole to contact the copper sleeve. A spring is fixed on the top of the columnar copper core, and the other end of the spring is fixed on the inner top surface of the blind hole, that is, the top of the columnar copper core is connected to the copper sleeve through the spring. The columnar copper core is also provided with a pin hole, and the lower end of the copper sleeve is provided with a pin groove matching the pin hole, and the lower part of the columnar copper core is connected to the copper sleeve by inserting a pin in the pin hole or the pin groove, and The cylindrical copper core and the copper sleeve can move relatively within the range of the pin groove. The copper sleeve and the columnar copper core are covered with an insulating sleeve, that is, the copper sleeve and the columnar copper core are arranged inside the insulating sleeve, and are isolated from the outside by the insulating sleeve to avoid current leakage. A conventional metal sleeve is placed outside the insulating sleeve. The part of the columnar copper core located in the blind hole is also provided with a ring of bosses, which is a ring of protrusions on the columnar copper core outward along the circumferential direction. During the use of the utility model, the screw thread between the metal sleeve and the grounding cover is tightened, the metal sleeve moves upwards, and the first sealing ring is squeezed to realize the sealing between the metal sleeve and the grounding cover. At the same time, it drives the insulating boss to move upward, and the insulating boss moves to contact with the boss, and exerts an upward force on the boss, that is, pushes the columnar copper core to move upward, and the spring is compressed by force, and the copper bush is applied to the grounding copper column of the last screen. Force, so as to ensure the close contact between the last screen grounding copper column and the copper sleeve, and ensure good electrical connection performance. The insulating convex sleeve moves under the drive of the metal sleeve, so the insulating convex sleeve and the metal sleeve are in close contact, and the second sealing ring is squeezed to realize the sealing between the insulating convex sleeve and the metal sleeve. A third sealing ring is provided on the contact surface between the insulating washer and the metal sleeve, which is used to seal the periphery of the columnar copper core again from the outside, and the third sealing ring cooperates with the insulating washer to achieve a moisture-proof effect. In summary, the utility model ensures the effect of ground insulation through the insulating sleeve, insulating convex sleeve and insulating washer, and through the first sealing ring, the second sealing ring, the third sealing ring and the matching metal sleeve connected by thread , springs and other components to achieve the purpose of improving the sealing performance.

Further, a fourth sealing ring is provided between the boss and the insulating boss. When the thread between the metal sleeve and the grounding cover is tightened, the metal sleeve moves upwards, driving the insulating boss to move upward, and the insulating boss moves to contact with the boss, squeezing the fourth sealing ring to realize the insulation between the boss and the boss. The sealing between the convex sleeves further improves the moisture-proof sealing performance of the utility model.

Further, the metal sleeve is made of aluminum alloy. The aluminum alloy has high corrosion-resistant strength, and being used to make the metal sleeve in the utility model is beneficial to improving the service life.

Further, the insulating boss is a convex structure made of insulating material, and a through hole is provided along its axis direction, the through hole is matched with the columnar copper core, and the columnar copper core passes through the through hole.

Further, the end of the columnar copper core located outside the metal sleeve is sheathed with a nut, and the outer surface of the columnar copper core is provided with an external thread matching the nut. That is, by tightening the nut, both the insulating gasket and the third sealing ring can be squeezed on the surface of the metal sleeve to achieve a more excellent moisture-proof sealing effect.

Further, the columnar copper core is also electrically connected to the copper sleeve through an annealed copper wire. The electrical connection effect between the columnar copper core and the copper sleeve is ensured by the annealed copper wire, which can prevent the failure of the electrical connection.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

The utility model is an end-screen grounding device for extracting casing leakage current signals. By tightening the screw thread between the metal sleeve and the ground cover, the metal sleeve moves upwards and squeezes the first sealing ring to realize the connection between the metal sleeve and the ground cover. At the same time, it drives the insulating boss to move upward, and the insulating boss moves to contact with the boss, and exerts an upward force on the boss, that is, pushes the columnar copper core to move upward, and the spring is compressed by force, and the copper bush is applied toward the end. The force of the screen grounding copper column, so as to ensure the close contact between the last screen grounding copper column and the copper sleeve, and ensure good electrical connection performance. The insulating convex sleeve moves under the drive of the metal sleeve, so the insulating convex sleeve and the metal sleeve are in close contact, and the second sealing ring is squeezed to realize the sealing between the insulating convex sleeve and the metal sleeve. A third sealing ring is provided on the contact surface between the insulating washer and the metal sleeve, which is used to seal the periphery of the columnar copper core again from the outside, and the third sealing ring cooperates with the insulating washer to achieve a moisture-proof effect.

Description of drawings

The drawings described here are used to provide a further understanding of the embodiments of the utility model, constitute a part of the application, and do not constitute a limitation to the embodiments of the utility model. In the attached picture:

Fig. 1 is the structural representation of the specific embodiment of the utility model;

Fig. 2 is the structural representation of copper sleeve in the specific embodiment of the utility model;

Fig. 3 is the structural representation of columnar copper core in the specific embodiment of the utility model;

Fig. 4 is a schematic structural diagram of an insulating boss in a specific embodiment of the present invention.

Marks and corresponding part names in the drawings:

1-Grounding cover, 2-Last screen grounding copper column, 3-Insulating porcelain sleeve, 4-Copper sleeve, 41-Blind hole, 42-Pin groove, 5-Column copper core, 51-Pin hole, 6-Spring, 7 -insulating sleeve, 8-metal sleeve, 9-boss, 10-insulating boss, 101-through hole, 11-insulating washer, 12-first sealing ring, 13-second sealing ring, 14-third Sealing ring, 15-the fourth sealing ring, 16-nut.

detailed description

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the examples and accompanying drawings. The schematic implementation of the utility model and its description are only used to explain the utility model Novelty, not as a limitation to the utility model.

Example 1:

As shown in Figures 1 to 4, an end-screen grounding device for extracting bushing leakage current signals includes a ground cover 1, an end-screen grounding copper post 2 passing through the ground cover 1, and an end-screen grounding copper post 2 surrounding the end-screen grounding device. Insulating porcelain sleeve 3, a copper sleeve 4 is provided at the lower end of the grounding copper column 2 of the last screen, and the lower end of the copper sleeve 4 is connected to a columnar copper core 5. The bottom of the copper sleeve 4 is provided with a blind hole 41, and the columnar copper core 5 is inserted into the blind hole 41. The copper core 5 is connected to the top of the blind hole 41 by a spring 6; the columnar copper core 5 is also provided with a pin hole 51, and the lower end of the copper sleeve 4 is provided with a pin groove 42 matching the pin hole 51, through which the pin hole 51 , The pins in the pin groove 42 connect the columnar copper core 5 and the copper sleeve 4; the copper sleeve 4 and the columnar copper core 5 are covered with an insulating sleeve 7, and the outer side of the insulating sleeve 7 is provided with a metal sleeve 8, The metal sleeve 8 is threadedly connected with the ground cover 1; the columnar copper core 5 passes through the outside of the metal sleeve 8; the part of the columnar copper core 5 located in the blind hole 41 is also provided with a ring of bosses 9, the metal The inner bottom surface of the sleeve 8 covers the columnar copper core 5 through the insulating boss 10, and the outer surface of the metal sleeve 8 covers the columnar copper core 5 passing through the metal sleeve 8 through the insulating gasket 11; the ground cover 1 The first sealing ring 12 is set between the metal sleeve 8, the second sealing ring 13 is set on the contact surface of the insulating boss 10 and the metal sleeve 8, and the contact surface of the insulating gasket 11 and the metal sleeve 8 A third sealing ring 14 is provided. A fourth sealing ring 15 is arranged between the boss 9 and the insulating boss 10 . The metal sleeve 8 is made of aluminum alloy. The insulating convex sleeve 10 is a convex structure made of insulating material, and a through hole 101 is arranged along its axis direction. The through hole 101 is matched with the columnar copper core 5, and the columnar copper core 5 passes through the through hole 101. . The columnar copper core 5 is located at the outer end of the metal sleeve 8 . The columnar copper core 5 is also electrically connected to the copper sleeve 4 through an annealed copper wire.

During the use of the utility model, the screw thread between the metal sleeve 8 and the ground cover 1 is tightened, the metal sleeve 8 moves upwards, and the first sealing ring 12 is squeezed to realize the sealing between the metal sleeve 8 and the ground cover 1 . At the same time, it drives the insulating boss 10 to move upward, and the insulating boss 10 moves to contact with the boss 9, and exerts an upward force on the boss 9, that is, pushes the columnar copper core 5 to move upward, and the spring 6 is compressed by force to apply force to the copper bush 4. The force towards the last-screen grounding copper post 2 ensures close contact between the last-screen grounding copper post 2 and the copper sleeve 4 to ensure good electrical connection performance. When the insulating boss 10 moves to contact with the boss 9, it will also squeeze the fourth sealing ring 15 to realize the sealing between the boss 9 and the insulating boss 10, and further improve the moisture-proof sealing performance of the utility model. The insulating convex sleeve 10 moves under the drive of the metal sleeve 8, so the insulating convex sleeve 10 and the metal sleeve 8 are in close contact, and the second sealing ring 13 is squeezed to realize the sealing between the insulating convex sleeve 10 and the metal sleeve 8. of the seal. A third sealing ring 14 is provided on the contact surface between the insulating gasket 11 and the metal sleeve 8 for sealing the periphery of the columnar copper core 5 again from the outside. The third sealing ring 14 cooperates with the insulating gasket 11 to achieve moisture-proof effect.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present utility model in detail. Within the protection scope of the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims (6)

1. An end-screen grounding device for extracting bushing leakage current signals, including a ground cover (1), an end-screen ground copper column (2) passing through the ground cover (1), and an end-screen ground copper column (2) surrounding the end screen The insulating porcelain sleeve (3), the copper sleeve (4) is provided at the lower end of the last screen grounding copper column (2), and the lower end of the copper sleeve (4) is connected to the columnar copper core (5), characterized in that: the bottom of the copper sleeve (4) A blind hole (41) is opened, and the columnar copper core (5) is inserted into the blind hole (41), and the columnar copper core (5) is connected to the top of the blind hole (41) through a spring (6); the columnar copper core (5) There is also a pin hole (51) on the top, and a pin slot (42) matching the pin hole (51) is set at the lower end of the copper sleeve (4), and the pin inserted into the pin hole (51) and the pin slot (42) Connecting the columnar copper core (5) and the copper sleeve (4); the outside of the copper sleeve (4) and the columnar copper core (5) is provided with an insulating sleeve (7), and the outer side of the insulating sleeve (7) is provided with A metal sleeve (8), the metal sleeve (8) is threadedly connected with the ground cover (1); the columnar copper core (5) passes out to the outside of the metal sleeve (8); the columnar copper core (5) ) in the blind hole (41) is also provided with a ring of bosses (9), the inner bottom surface of the metal sleeve (8) covers the columnar copper core (5) through the insulating boss (10), and the metal sleeve ( 8) The outer surface of the cylindrical copper core (5) passing through the metal sleeve (8) is covered by an insulating gasket (11); a first seal is set between the ground cover (1) and the metal sleeve (8) ring (12), the second sealing ring (13) is provided on the contact surface between the insulating boss (10) and the metal sleeve (8), and the contact surface of the insulating gasket (11) and the metal sleeve (8) Set the third sealing ring (14) on it. 2. The end screen grounding device for extracting bushing leakage current signal according to claim 1, characterized in that: a fourth sealing ring (15) is arranged between the boss (9) and the insulating boss (10) . 3. The end-screen grounding device for extracting bushing leakage current signal according to claim 1, characterized in that: the metal sleeve (8) is made of aluminum alloy. 4. The end screen grounding device for extracting bushing leakage current signal according to claim 1, characterized in that: the insulating boss (10) is a convex structure made of insulating material, and along its axial direction A through hole (101) is provided, the through hole (101) matches the columnar copper core (5), and the columnar copper core (5) passes through the through hole (101). 5. The end screen grounding device for extracting bushing leakage current signal according to claim 1, characterized in that: the end of the columnar copper core (5) located outside the metal sleeve (8) is sleeved with a screw The cap (16), the outer surface of the columnar copper core (5) is provided with an external thread matching the nut (16). 6 . The end screen grounding device for extracting bushing leakage current signal according to claim 1 , characterized in that: the columnar copper core ( 5 ) is also electrically connected to the copper sleeve ( 4 ) through soft copper wire. 7 .