CN207010168U - A kind of cable for mounting area arrester and overhead line all insulation clutch - Google Patents

Abstract

The utility model discloses a fully insulated splitter for cables and overhead lines that can be attached to a ground belt lightning arrester in the field of electrical equipment, including a bottom frame and a switch knife. The top surface of the bottom frame is sequentially provided with an upper post insulator and a lightning arrester. and the lower post insulator; an upper contact is fixed on the top surface of the upper post insulator away from the arrester, and a bracket is fixed on the top surface of the upper post insulator close to the arrester; the top of the lower post insulator The surface is fixed to the fixed end of the lower contact, and the top surface of the free end of the lower contact is fixed with a grounding rod for connecting the ground cable; the top surface of the fixed end of the lower contact is fixed with a stopper; the switch knife The pivot connection end of the switch knife is connected to the stop pivot, and the free end of the switch knife can be clamped with the bracket and in contact with the upper contact; the middle part of the switch knife is provided with the The contacts on the top surface of the arrester are inserted into the contacts.

Description

A fully insulated splitter for cables and overhead lines with lightning arresters that can be attached to the ground

technical field

The utility model relates to a fully insulated splitter for cables and overhead lines that can be attached to a ground belt lightning arrester in the field of electrical equipment.

Background technique

According to the State Grid 10kV overhead line standardization design specification, currently in the process of overhead line into the ground, it must be connected to the ground cable through a special combination of electrical appliances, referred to as the cable, for example, the protection cable published in the application number 201410226522. Combined fully insulated surge arrester, which combines the main functions of isolating switch/drop-out fuse and surge arrester into one, can greatly improve the speed of finding and diagnosing fault points, work efficiency during live repairs, and comprehensively improve construction quality and reduce labor intensity. It is of great practical significance to reduce the power failure time, reduce the power outage time, small power outage range, high safety factor, less impact on users, and improve power supply reliability.

However, the product also has the following disadvantages:

First, the lower contact is directly connected to the cable, which is likely to cause a ground short circuit and affect the normal operation of the equipment.

Second, the upper contact is directly connected to the overhead line, which greatly reduces the safety of load operation under humid weather conditions.

Utility model content

The purpose of this utility model is to overcome the deficiencies of the prior art and provide a fully insulated splitter for cables and overhead lines that can be connected to a grounding arrester, which can effectively prevent the grounding short circuit between the lower contact and the grounding cable. Guarantee the reliability of operation.

A technical solution to achieve the above purpose is: a fully insulated switch for cables and overhead lines that can be attached to ground strap lightning arresters, including a bottom frame and a switch blade. Surge arresters and lower post insulators;

An upper contact is fixed on the top surface of the upper post insulator away from the arrester, and a bracket is fixed on the top surface of the upper post insulator close to the arrester;

The top surface of the lower post insulator is fixed to the fixed end of the lower contact, and the top surface of the free end of the lower contact is fixed with a ground rod for connecting to the ground cable;

The top surface of the fixed end of the lower contact is fixed with a stop; the pivot connection end of the switch knife is connected to the stop pivot, and the free end of the switch knife can be clamped with the bracket and connected to the bracket. The upper contacts are in surface contact;

The middle part of the switch blade is provided with a contact piece which can be inserted into the contact finger on the top surface of the arrester.

Further, the top surface of the upper post insulator is provided with an upper insulating cover covering the upper contact and the bracket, and the top surface of the lower post insulator is provided with an upper insulating cover covering the stopper and the lower contact. The lower insulating cover, and the ground rod passes through the lower insulating cover upwards.

Further, the free end of the lower contact is bent toward a side away from the bottom frame.

Further, the bracket is provided with a lock hole, and the free end of the switch knife is provided with a lock, and the end of the lock close to the contact piece is pivoted with the free end of the switch knife through the first pin shaft. connected, and downwardly form a lock hook that can be engaged with the lock hole, and above the lock hook is a closing stop that is located in the switch knife and can be toggled.

Still further, a pull button is provided between the lock catch and the contact piece, the pivot connection end of the pull button is pivotally connected with the switch knife through the second pin shaft, and the free end of the pull button It is a finger that can be engaged with the closing gear, the upper part of the buckle forms a pull ring, and the lower part of the pull ring is provided with a lower hole between the second pin shaft and the finger , the lower hole is provided with a limit pin that adheres to the wall of the lower hole, and a return spring is provided between the second pin shaft and the closing stop, and the return spring and the limit pin lower contact.

Further, the radially outer side of the second pin shaft is sleeved with a sleeve, and the return spring is connected with the sleeve.

Furthermore, the switch knife covers the insulating sleeve, the pull ring passes through the insulating sleeve upwards, and the contact piece passes through the insulating sleeve downwards.

Further, the bottom surface of the chassis is provided with a mounting connection plate.

Further, paper gaskets are provided between the upper post insulator and the bottom frame, and between the lower post insulator and the bottom frame.

Further, a bowl-shaped washer is provided between the stopper and the lower contact.

Adopting the technical scheme of a fully insulated splitter for cables and overhead lines that can be attached to ground belt surge arresters of the present invention, it includes a bottom frame and a switch blade. The top surface of the bottom frame is sequentially provided with an upper post insulator and a lightning arrester. and the lower post insulator; an upper contact is fixed on the top surface of the upper post insulator away from the arrester, and a bracket is fixed on the top surface of the upper post insulator close to the arrester; the top of the lower post insulator The surface is fixed to the fixed end of the lower contact, and the top surface of the free end of the lower contact is fixed with a grounding rod for connecting the ground cable; the top surface of the fixed end of the lower contact is fixed with a stopper; the switch knife The pivot connection end of the switch knife is connected to the stop pivot, and the free end of the switch knife can be clamped with the bracket and in contact with the upper contact; the middle part of the switch knife is provided with the The contacts on the top surface of the arrester are inserted into the contacts. Its technical effect is: it can effectively prevent the grounding short circuit between the lower contact and the grounding cable, and ensure the reliability of operation.

Description of drawings

Fig. 1 is a front view of a first embodiment of a fully insulated switch for cables and overhead lines that can be attached to ground strap arresters of the present invention.

Fig. 2 is a top view of a first embodiment of a fully insulated switch for cables and overhead lines that can be attached to ground strap arresters of the present invention.

Fig. 3 is a front view of a second embodiment of a fully insulated switch for cables and overhead lines that can be attached to ground strap surge arresters of the present invention.

detailed description

Please refer to Fig. 1, in order to better understand the technical solution of the present utility model, the inventor of the utility model will describe in detail below through specific embodiments in conjunction with the accompanying drawings:

First embodiment:

Please refer to Fig. 1 and Fig. 2 , a fully insulated switch for cables and overhead lines that can be attached to a ground strap lightning arrester of the present invention includes a chassis 1 and a switch blade 5 . On the top surface of the chassis 1, an upper post insulator 2, a lightning arrester 3 and a lower post insulator 4 are arranged in sequence. Paper gaskets are provided between the upper post insulator 2 , the lower post insulator 4 , and the base frame 1 to ensure the insulation performance between the upper post insulator 2 , the lower post insulator 4 , and the base frame 1 . The bottom of the base frame 1 is provided with an installation connecting plate 11 for installing a cable and an overhead line fully insulated splitter of the utility model that can be attached to the ground belt arrester on the pole tower.

Wherein the top surface of the upper pillar insulator 2 is fixed on the side away from the arrester 3 with an upper contact 21, the fixed end of the upper contact 21 is fixed to the side of the upper pillar insulator 2 away from the arrester 3, and the free end faces away from the arrester 3. One side sticks out.

A right-angled bracket 22 is fixed on the top surface of the upper post insulator 2 near the arrester 3 . The support 2 is divided into a vertical section and a horizontal section fixed to the side of the top surface of the upper post insulator 2 close to the arrester 3 . A locking hole 221 is defined on a vertical section of the bracket 22 . The top surface of the vertical section of the bracket 22 is provided with grooves (not shown in the figure).

The top surface of the lower post insulator 4 is fixed with a lower contact 41, the fixed end of the lower contact 41 is fixed to the top surface of the lower post insulator 4, and the free end protrudes to the side away from the arrester 3, and to the side away from the bottom frame 1 Bending, the top surface of the free end of the lower contact 41 is fixed with a grounding rod 42, and the grounding rod 42 is connected to the ground cable, which is used to prevent the cable and the overhead line fully insulated splitter of the utility model from being connected to a grounding arrester. A grounding short circuit occurs with the grounded cable, which protects a fully insulated switch for cables and overhead lines that can be attached to the ground belt lightning arrester of the utility model, so that it can operate normally. A stopper 43 is fixed on the top surface of the fixed end of the lower contact 41 . A bowl-shaped washer is provided between the stopper 43 and the lower contact 41 to ensure the electrical conductivity between the switch blade 5 and the lower contact 41 .

The pivot connection end of the switch knife 5 is pivotally connected with the stopper 43, and the free end of the switch knife 5 can be embedded in the groove on the top surface of the vertical section of the bracket 22, and contacts with the upper contact 21 surface. The free end of the switch knife 5 is also provided with a lock 6 for locking the switch knife 5 and the bracket 22 to prevent the switch knife 5 from being separated from the bracket 22 under the conditions of self-weight, vibration, and system short-circuit electric power, etc. The middle part of 5 is also provided with a contact piece 51 corresponding to the position of the lightning arrester 3 , and the contact piece 51 can be inserted into the contact finger 31 fixed on the top surface of the lightning arrester 3 .

One end of the lock catch 6 close to the contact piece 51 is pivotally connected to the free end of the switch knife 5 through the first pin shaft 61, and forms a lock hook 62 that can be engaged with the lock hole 221 of the bracket 22 downward. There is a closing stopper 63 engaged in the switch knife 5 above, which is engaged with the top surface of the lock hook 62 to limit the rotation of the lock catch 6 and drive the lock hook 62 to break away from the lock hole 221 of the bracket 22, thereby preventing the switch knife 5 from In the case of self-weight, vibration and system short-circuit electric power, etc., it is separated from the bracket 22 and automatically opens the brake.

A pull button 7 is provided between the lock catch 6 and the contact piece 51. The pivot connection end of the pull button 7, that is, the end away from the lock catch 6 is pivotally connected to the switch blade 5 through a second pin shaft 71, and the second pin shaft The radial outer side of 71 is sleeved with the shaft sleeve 72 . The free end of the pull button 7 is provided with a picking finger 73 , and the picking finger 73 is engaged with the bottom surface of the closing stop 63 . The upper part of the pull button 7 is a pull ring 74, and the lower part of the pull ring 74 is a lower hole 75 located between the second pin shaft 71 and the pick finger 73, and the lower hole 75 is provided with a limit pin 76 attached to the lower hole 75 .

There is a return spring 52 inside the switch knife 5, one end of the return spring 52 is overlapped on the shaft sleeve 72, and the other end is pressed on the closing stop 63 of the lock catch 6, and the middle part of the return spring 52 is against the limit position. below pin 76.

The utility model is a fully insulated splitter for cables and overhead lines that can be attached to ground belt lightning arresters. The upper contact 21 is connected to the overhead line through the AMP connector, and the lower contact 41 is connected to the ground cable through the ground rod 42 .

When the opening operation is required, the load breaker penetrates the pull ring 74 of the pull buckle 7, and pulls the switch blade 5 to the side away from the bottom frame 1. At the beginning, due to the close contact between the switch blade 5 and the upper contact 21, there is a large frictional force, and the lock hook 62 is locked with the lock hole 221, the switch knife 5 remains stationary, and the pull button 7 rotates around the second pin shaft 72, because the limit pin 76 has an appropriate displacement space in the lower hole 75 , the return spring 52 is compressed, and the picking finger 73 of the pull button 7 moves the closing stop 63 of the lock catch 6, so that the lock catch 6 rotates around the first pin shaft 61, and the lock hook 62 of the lock catch 6 moves from the bracket 22 The lock hole 221 is disengaged, and at the same time, the end surface of the lock catch 6 close to the end of the contact piece 51 is against the closing stopper 63, thereby pulling the switch knife 5, separating the switch knife 5 from the upper contact 21, and the switch knife 5 continues to surround The stop 43 rotates, and the contact piece 51 on the switch blade 5 is separated from the contact finger 31 on the arrester 3. When the switch knife 5 is displaced to the position of the stop 43, the entire opening process is completed. A visible isolation fracture is formed between 22 and contact finger 31. The lightning arrester 3 is also separated from the conductive main circuit.

During closing operation, due to the effect of the return spring 52, the limit pin 76 of the pull button 7 is close to the inner wall of the lower hole 75 in the lower hole 75, so that the operating force of the load disconnector directly acts on the switch knife 5, so that The switch blade 5 rotates around the stop 43, and the contact piece 51 on the switch blade 5 is first embedded into the contact finger 31 of the arrester 3 to realize electrical connection. The switch knife 5 continues to rotate, and the switch knife 5 is in surface contact with the upper contact 21, realizing the electrical connection of the conductive main circuit. During this process, the lock hook 62 of the lock catch 6 will rotate around the first pin shaft 61 and slide into the lock hole 221 of the bracket 22 under the action of the return spring 52, so as to realize the surface contact between the switch knife 5 and the upper contact 21 and lock, to ensure that the switch blade 5 will not be damaged due to its own weight, vibration and electric power when the cable and overhead line fully insulated switch that can be connected to the ground belt lightning arrester of the present utility model is installed obliquely or upside down. The lock hook 62 is separated from the lock hole 221 .

The utility model relates to a fully insulated splitter for cables and overhead lines that can be connected to a ground belt lightning arrester. In the closing state, the high-voltage end current passes through the upper contact 21, and the switch knife 5 is connected to the overhead line and is insulated from the earth to complete the power transmission. When a lightning strike or operating overvoltage occurs, the arrester 3, which usually exhibits insulating properties, exhibits its excellent nonlinear characteristics, and its internal excellent metal oxide resistors quickly show a transformation from high resistance to low resistance, and a small increase in voltage will It causes a sudden change in the current increase of several orders of magnitude. At this time, the arrester 3 changes from the insulator characteristic to the conductor characteristic, and the overvoltage is released to the earth through the arrester 3. When the voltage drops to the threshold value of the resistor sheet, the inverter process occurs. The tiny voltage The reduction will cause a sharp increase in resistance, and the lightning arrester 3 changes from a conductor characteristic to an insulator characteristic, thereby maintaining the normal working state of the power system.

The utility model is a fully insulated splitter for cables and overhead lines that can be attached to ground belt lightning arresters, which can reduce costs, reduce construction intensity, facilitate maintenance and inspection, quickly find underground cable fault points, and reduce blackout areas for power grid construction. , Shorten the power outage time, provide system safety and reliability, etc., and also reduce the occurrence of ground short circuits.

In the cable and overhead line fully insulated splitter of the utility model that can be attached to the ground belt lightning arrester, the upper contact 21 and the lower contact 41 are all made of high-quality copper busbars, which have high purity, good conductivity and high surface hardness. The switch blade 5 is formed by pultrusion of electrolytic copper, and there are also flanges on both sides of the switch blade 5 to increase strength and rigidity, so as to ensure reliable connection under the action of electric power. The surface of all conductive main circuit components is treated with silver plating, which can effectively reduce contact resistance, increase anti-corrosion performance, and improve power supply reliability. The upper post insulator 2 and the lower post insulator 4 are made of composite materials with a large creepage distance, which are light in weight and strong in pollution resistance. The chassis 1 is processed by hot-dip galvanizing, which has good anti-corrosion performance and long service life. The pull buckle 6 and the lock buckle 7 are formed by pressing cast steel, and the force-bearing position is well matched with the fulcrum of rotation. The leverage principle is used to reduce the operating torque, which is beneficial to the reliable opening of the switch blade 5 in the event of freezing, snow and hail disasters. Combining with the use characteristics of the load breaker and referring to the installation method of the drop-out fuse, an installation connection plate 11 with a certain installation slope is added to the bottom surface of the chassis 1 .

second embodiment

The difference between the second embodiment and the first embodiment is that an upper insulating cover 23 covering the upper contact 21 and the bracket 22 is added on the top surface of the upper post insulator 2 . The upper insulating cover 23 is of the same height as the support 22 . The side of the upper insulating cover 22 close to the arrester 3 is provided with an opening for the opening and closing operation of the switch knife 5 . The top surface of the lower post insulator 4 is increased with a lower insulating cover 44 covering the stopper 43 and the lower contact 41, and the grounding rod 42 passes through the lower insulating cover 44 upwards. Except for the part of the switch knife 5 that is in contact with the upper contact 2 , are coated with the insulating sleeve 53, the pull ring 74 passes through the insulating sleeve 53 upwards, and the contact piece 51 passes through the insulating sleeve 53 downwards. Through the above-mentioned technical means, the full insulation between the cables of the ground strap surge arrester of the present invention and the overhead line fully insulated switch is realized, which ensures the protection of the ground strap surge arrester of the present utility model under humid weather conditions. The safety of the cable and overhead line fully insulated switch for load operation.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the utility model, rather than as a limitation to the utility model, as long as within the spirit of the utility model, the above-mentioned The changes and modifications of the embodiments will all fall within the scope of the claims of the present utility model.

Claims (10)

1. A fully insulated splitter for cables and overhead lines that can be attached to a ground belt lightning arrester, comprising a base frame and a switch knife, and the top surface of the base frame is successively provided with an upper post insulator, a lightning arrester and a lower post insulator; its characteristics in: An upper contact is fixed on the top surface of the upper post insulator away from the arrester, and a bracket is fixed on the top surface of the upper post insulator close to the arrester; The top surface of the lower post insulator is fixed to the fixed end of the lower contact, and the top surface of the free end of the lower contact is fixed with a ground rod for connecting to the ground cable; The top surface of the fixed end of the lower contact is fixed with a stop; the pivot connection end of the switch knife is connected to the stop pivot, and the free end of the switch knife can be clamped with the bracket and connected to the bracket. The upper contacts are in surface contact; The middle part of the switch blade is provided with a contact piece which can be inserted into the contact finger on the top surface of the arrester. 2. A fully insulated switch for cables and overhead lines that can be attached to ground strap lightning arresters according to claim 1, characterized in that: the top surface of the upper post insulator is provided with a cover covering the upper contact and the The upper insulating cover of the bracket, the top surface of the lower post insulator is provided with a lower insulating cover covering the stopper and the lower contact, and the ground rod passes through the lower insulating cover upwards. 3. A fully insulated switch for cables and overhead lines that can be attached to ground strap surge arresters according to claim 1 or 2, characterized in that: the free end of the lower contact faces to the side away from the bottom frame bent. 4. According to claim 1 or 2, a fully insulated switch for cables and overhead lines that can be attached to ground belt lightning arresters is characterized in that: the bracket is provided with a lock hole, and the free end of the switch blade is provided with a There is a lock, the end of the lock close to the contact piece is pivotally connected with the free end of the knife through the first pin, and a lock hook that can be engaged with the lock hole is formed downward. On the top of the locking hook, there is a closing stop which is located in the switch knife and can be toggled. 5. A fully insulated switch for cables and overhead lines that can be attached to a ground strap lightning arrester according to claim 4, characterized in that: there is a pull button between the lock and the contact piece, and the pull The pivot connection end of the buckle is pivotally connected with the switch knife through the second pin shaft, the free end of the pull buckle is a picking finger that can be engaged with the closing stop, and the upper part of the pull buckle forms a pull button. ring, the bottom of the pull ring is provided with a lower hole between the second pin shaft and the pick finger, the lower hole is provided with a limit pin attached to the wall of the lower hole, and the first A return spring is arranged between the two pin shafts and the closing stop, and the return spring is in contact with the lower part of the limit pin. 6. A fully insulated switch for cables and overhead wires that can be attached to ground strap lightning arresters according to claim 5, characterized in that: the radially outer side of the second pin shaft is sleeved with a sleeve, and the return spring Attach the bushing. 7. A fully insulated switch for cables and overhead lines that can be attached to ground strap lightning arresters according to claim 5, characterized in that: the switch knife is covered with an insulating sleeve, and the pull ring passes through the insulating sleeve upwards. sleeve, and the contact pieces pass through the insulating sleeve downwards. 8. A fully insulated switch for cables and overhead lines that can be attached to ground strap surge arresters according to claim 1 or 2, characterized in that: the bottom surface of the bottom frame is provided with a mounting connection plate. 9. A fully insulated splitter for cables and overhead lines that can be attached to ground strap surge arresters according to claim 1 or 2, characterized in that: between the upper post insulator and the bottom frame, the lower post Paper gaskets are arranged between the insulator and the bottom frame. 10. A fully insulated switch for cables and overhead lines that can be attached to ground strap surge arresters according to claim 1 or 2, characterized in that: a bowl-shaped washer is provided between the stop and the lower contact .