CN215069786U

CN215069786U - Lower isolation pole

Info

Publication number: CN215069786U
Application number: CN202022870158.8U
Authority: CN
Inventors: 李国强; 周顺彪
Original assignee: XIAMEN HUANYUAN ELECTRIC POWER TECHNOLOGY CO LTD
Current assignee: Xiamen Huanyuan Power Technology Co.,Ltd.
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-12-07
Anticipated expiration: 2030-12-04

Abstract

The utility model relates to a high tension switchgear technical field, concretely designs a keep apart utmost point post down, including insulator, inlet wire end and leading-out terminal, inlet wire end, leading-out terminal and insulator integrated into one piece are equipped with the holding chamber in the insulator, keep apart utmost point post down and still be equipped with the inlet wire conductor, be qualified for the next round of competitions conductor and leading-out terminal ground connection shielding net, the clearance has between leading-out terminal ground connection shielding net and the outlet conductor, keep apart utmost point post down and still include vacuum interrupter, set up in the holding intracavity. The utility model increases the curvature of the electric field by the structure at the movable end of the arc extinguish chamber, and reduces the electric field intensity and the corona effect; the curvature of the electrode is increased through the shielding net structure, the electric field intensity is reduced, the epoxy resin in the insulating structure is main insulation, the voltage resistance and the partial discharge level are achieved, the thickness of the epoxy resin and the control guarantee of the process during forming are achieved, the phase distance is small in the whole scheme, the switch is miniaturized, the interchangeability is good, the installation is convenient, and the reliability is high.

Description

Lower isolation pole

Technical Field

The utility model relates to a high tension switchgear technical field, concretely relates to keep apart utmost point post down.

Background

In medium voltage distribution networks, the medium of the medium voltage network is the insulation medium SF6, and SF6 gas is one of six greenhouse gases, which has received wide attention from people in all communities. China already takes the implementation of energy conservation and emission reduction as a national policy of sustainable development.

The ring main unit adopting the solid insulation mode is developed aiming at replacing SF6 insulation switch cabinet equipment so as to meet the requirement of adaptation under severe environment conditions. The structure is characterized in that: the whole conductive loop of the switch is sealed in an epoxy resin insulating material and is connected with a high-voltage line through sleeve surfaces at two ends of a lower isolation pole, so that the operation of the switch is not influenced by external conditions, such as plateau areas, dirty and humid areas and the like, and good environmental resistance is achieved. Meanwhile, the metalized grounding treatment is carried out on the surface of the whole isolation pole under the epoxy resin, so that the damage to other switches or surrounding facilities caused by interphase short circuit fault is prevented, and the severity of the accident is reduced.

The lower isolation pole column meets the requirements of the whole loop of the ring main unit which adopts solid insulation epoxy resin as an insulation medium on the ground and the phase insulation performance.

The main drawbacks with the conventional solutions are:

1. SF6 is one of the gases which are definitely forbidden to be used by the Kyoto protocol, and has obvious greenhouse effect;

2. SF6 is used as an external insulation medium, because of high medium strength, the high-voltage ground distance can be designed to be small, and if the box body leaks (strictly speaking, the box body is not completely sealed, and only the leakage rate is different), the phenomena of interphase and ground breakdown are easy to occur;

3. the requirement on the connection of the conductive loop in the box body is high (SF6 interface effect is obvious);

4. the box body is filled with a certain pressure SF6, and the quality requirement of the box body is high.

SUMMERY OF THE UTILITY MODEL

This is not enough to prior art, the utility model provides a keep apart utmost point post down, it mainly provides an insulating, supports the utmost point post of whole conductive loop (open, close, ground connection, isolation).

In order to achieve the purpose, the utility model is realized by the following technical proposal:

the utility model provides an keep apart utmost point post down, includes insulator, inlet wire end and leading-out terminal, inlet wire end, leading-out terminal and insulator integrated into one piece, wherein be equipped with the holding chamber in the insulator, keep apart utmost point post still and be equipped with inlet wire conductor, outlet wire conductor and leading-out terminal ground connection shielding net down, the clearance has between leading-out terminal ground connection shielding net and the outlet wire conductor, keep apart utmost point post still including vacuum interrupter down, vacuum interrupter set up in the holding intracavity, the inlet wire conductor stretches into insulator through the inlet wire end and is connected with holding chamber top in vivo.

Keep apart utmost point post down, have following advantage:

1. the high-voltage electric switch is used for indicating the electrified state of the switch, when the high-voltage conductor is electrified, the induction capacitor generates a low-voltage electric signal, the high-voltage electric switch is connected with the high-voltage electrified display to achieve the prompting and warning functions, and the switch equipment does not need to be specially provided with a high-voltage sensor;

2. the electric field intensity at the position is reduced by the shielding net.

3. The high-voltage shielding cover is used for increasing the curvature of the electrode and reducing the electric field intensity, and meanwhile, the tip of the conductive loop is covered in the shielding net, so that tip discharge is avoided.

4. The size accuracy of the product is improved through the accurate size control of the die, the matching of the conductive loop is favorably improved, the contact resistance is reduced, and the interchangeability is improved. In the whole scheme, the phase distance is small (the switch is miniaturized), the interchangeability is good, the installation is convenient, and the reliability is high.

5. The mutual position degree of the conductors, the partial discharge capacity of the grounding shielding net and the partial discharge capacity of the metal shielding layer are controlled in production, the electrical aging of the insulator is reduced, and the service life of the product is greatly prolonged.

Drawings

Fig. 1 is a cross-sectional view of a lower isolated pole according to an embodiment of the present invention.

Fig. 2 is a first state view of the lower isolation terminal according to the embodiment of the present invention.

Fig. 3 is a second state view of the lower isolation terminal according to the embodiment of the present invention.

Description of reference numerals:

1. an epoxy resin insulating layer; 2. an incoming conductor; 3. a grounded shielding mesh; 4. a vacuum arc-extinguishing chamber; 5. a high voltage shield; 6. an outgoing line high-voltage shielding case; 7. positioning a nut; 8. an outgoing conductor; 9. the outlet end is grounded; 10. an incoming cable connection surface; 11. and the outlet cable is connected with the surface.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1-3, in the embodiment, a lower isolation pole is disclosed, which includes an insulating body, a wire inlet end, a wire outlet end, and a wire outlet end, where the wire inlet end, the wire outlet end, and the insulating body are integrally formed, a receiving cavity is provided in the insulating body, the lower isolation pole is further provided with a wire inlet conductor 2, a wire outlet conductor 8, and a wire outlet end grounding shielding net 9, a gap is provided between the wire outlet end grounding shielding net 9 and the wire outlet conductor 8, the lower isolation pole further includes a vacuum arc-extinguishing chamber 4, the vacuum arc-extinguishing chamber is disposed in the receiving cavity, and the wire inlet conductor 2 extends into the insulating body through the wire inlet end and is connected with the top of the receiving cavity.

As can be seen from the above description, the conductive loop includes the incoming conductor 2, the vacuum interrupter 4, the isolation grounding switch and the installation contact, and the outgoing conductor 8, which form a complete switch opening/closing, isolation, and grounding loop, the incoming conductor 2 is connected to the incoming cable or other switch cabinets in parallel, and the outgoing conductor 8 is connected to the outgoing cable and connected to the user end.

Further, keep apart utmost point post still includes high-pressure shield cover 5 down, high-pressure shield cover 5 sets up and puts the chamber bottom in insulator, and further, vacuum interrupter 4 moves the end and is equipped with high-

pressure shield cover

5, 8 ends of conductor of being qualified for the next round of competitions are equipped with high-pressure shield cover 5.

From the above description, it can be known that the high-voltage shielding net structure is additionally arranged at the movable end part of the arc extinguish chamber, so that the curvature of an electric field is increased, the electric field intensity and the corona effect are reduced, and the problem of partial discharge is solved; due to the adoption of the shielding structure, the power frequency voltage-withstanding level is improved and the partial discharge level is controlled to achieve the technical requirements of products by achieving uniform electric field and reducing the electric field intensity in a limited space, so that the miniaturization is realized, the overall electric field intensity of the connecting end of the power frequency voltage-withstanding level and the switch is reduced, the electrical performance requirements are met, a small phase distance is kept, the miniaturization requirements are met, and the probability of surface interphase faults is increased.

Further, the lower isolation pole also comprises an installation positioning nut 7, and the installation positioning nut 7 is connected with the outlet end grounding shielding net 9.

Further, the material of the insulating body is epoxy resin, the epoxy resin insulating layer 1 is formed, and the whole structure is cured through an epoxy resin automatic pressure gel forming process.

The above description shows that the epoxy resin plays a role in fixing and supporting, insulating along the surface and insulating isolation for the high-voltage conductor, the grounding shielding net 3 and the high-voltage shielding cover 5 play a role in equalizing the electric field, the grounding shielding net 3 is directly grounded or connected with a secondary display and control device, an epoxy resin automatic pressure gel forming process (APG) is adopted, the overall mechanicalness is obviously improved, the size accuracy of a product can be improved, the matching of a mechanism and a box body is facilitated, the contact resistance is reduced, the interchangeability is high, the number of possible partial discharge nodes is small, the service life is long, the cost is low, the weight is light, the installation is labor-saving and convenient, the requirement of installers is low, the phase distance is small (the switch is miniaturized) in the whole scheme, the interchangeability is good, the installation is convenient, and the reliability is high.

Further, an insulator is filled in the gap, and the insulator body are integrally formed; and the outgoing conductor 8 extends into the insulating body from the outgoing end and is connected with the bottom of the accommodating cavity.

Furthermore, the lower part of the outlet end of the lower isolation pole is provided with an umbrella skirt and an outlet high-voltage shielding cover 6.

According to the description, the umbrella skirt is arranged on the lower portion of the outlet end of the lower isolation pole, the creepage distance is increased, the use requirement of the altitude 4000m is met, and the use range of the product is expanded.

Further, the grounding shielding net 3 is made of a non-magnetic stainless steel net, the high-voltage shielding cover 5 is made of a semi-conductive nylon material, and the wire outlet end further comprises a wire inlet cable connecting surface 10 and a wire outlet cable connecting surface 11.

Furthermore, the outer surface of the insulating body is coated with a metal layer, and the metal layer is a zinc layer.

From the above description, it can be seen that the zinc layer can be used as a shielding layer and can generate an induced signal, and the induced signal can be directly grounded or connected to a display or a controller.

The contact seat and the isolation switch form an isolation state and a conduction state; the contact seat mounting nut is fixed on the metal frame through a bolt, the flexible connection and the movable end of the arc extinguish chamber are connected and fixed with the nut, the crank arm main shaft penetrates through the pin hole to be positioned, and the arc extinguish chamber is communicated with the conductor.

The working principle is as follows:

the conductor penetrates through the metal mounting surface, is an extremely uneven electric field and requires a certain ground distance, the extremely uneven electric field is changed into a slightly uneven electric field by adopting the grounding metal ground shielding layer, the electric field intensity is reduced, the safety margin is improved, and meanwhile, the metal shielding layer generates a secondary induction signal which can be directly grounded or connected with a secondary display or controller.

The surface of the lower isolation pole is grounded after being coated with the metal layer, so that the outer surface of the whole switch circuit is at the ground potential, the lower isolation pole can resist severe environments such as dirt, moisture and the like, and phase-to-phase faults are generated on the surface because the surface of each lower isolation pole is grounded.

When the whole structure is designed, the grounding shielding net 3 and the high-voltage shielding cover 5 are additionally arranged at the position with high electric field intensity through calculation and simulation. The electric field structure is adjusted through the grounding shielding net 3 and the high-voltage shielding cover 5, the whole electric field intensity of the connecting end of the switch is reduced, the electrical performance requirement is met, meanwhile, a small phase distance is kept, the miniaturization requirement is met, and the probability of surface interphase faults is met.

The umbrella skirt is arranged on the lower portion of the outgoing line end of the lower isolation pole, the creepage distance is increased, the use requirement of the altitude 4000m is met, and the use range of the product is expanded.

The lower isolation pole of the utility model is additionally provided with the high-voltage shielding net structure at the movable end part of the arc extinguish chamber, thereby increasing the curvature of an electric field and reducing the electric field intensity and the corona effect; when the high-voltage conductor is electrified, the induction capacitor generates a low-voltage electric signal, and the low-voltage electric signal is connected with a high-voltage electrified display to achieve the functions of prompting and warning, and the switch equipment does not need to be specially provided with a high-voltage sensor; the electrode curvature is increased through the shielding net, the electric field intensity is reduced, and meanwhile, the tip of the conductive loop is wrapped in the shielding net, so that tip discharge is avoided. The size accuracy of the product is improved through the accurate size control of the die, the matching of the conductive loop is favorably improved, the contact resistance is reduced, and the interchangeability is improved. The epoxy resin in the insulation structure is main insulation, and the voltage resistance and partial discharge level of the insulation structure are ensured by the control of the thickness of the epoxy resin and the process during molding. In the whole scheme, the phase distance is small (the switch is miniaturized), the interchangeability is good, the installation is convenient, and the reliability is high.

The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; these modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and therefore, all other embodiments obtained by those skilled in the art without any creative effort fall within the protection scope of the present invention.

Claims

1. The utility model provides a keep apart utmost point post down, includes insulator, inlet wire end and outlet terminal, inlet wire end, outlet terminal and insulator integrated into one piece, its characterized in that: the insulation body is internally provided with a holding cavity, the lower isolation pole column is further provided with an incoming line conductor, an outgoing line conductor and an outgoing line end grounding shielding net, a gap is formed between the outgoing line end grounding shielding net and the outgoing line conductor, the lower isolation pole column further comprises a vacuum arc extinguish chamber, the vacuum arc extinguish chamber is arranged in the holding cavity, and the incoming line conductor extends into the insulation body through the incoming line end and is connected with the top of the holding cavity.

2. The lower isolation pole according to claim 1, further comprising a high voltage shield disposed in the bottom of the inner cavity of the insulator.

3. The lower isolating pole post as claimed in claim 2, wherein the movable end of the vacuum arc-extinguishing chamber is provided with a high-voltage shielding case, and the outlet conductor end is provided with a high-voltage shielding case.

4. The lower isolation pole according to claim 1, further comprising a mounting and positioning nut, wherein the mounting and positioning nut is connected with the outlet end grounding shielding net.

5. The lower isolating pole according to claim 1, wherein the insulating body is made of epoxy resin, and the integral structure is cured by an epoxy resin automatic pressure gel forming process.

6. The lower isolating pole according to claim 1, wherein the gap is filled with an insulator, and the insulator body are integrally formed; and the outgoing conductor extends into the insulating body from the outgoing end and is connected with the bottom of the accommodating cavity.

7. The lower isolation pole according to claim 1, wherein an umbrella skirt is arranged at the lower part of the outlet end of the lower isolation pole.

8. The lower isolation pole according to claim 3, wherein the grounding shielding mesh is made of a non-magnetic stainless steel mesh, and the high-voltage shielding can is made of a semi-conductive nylon material.

9. The lower isolating pole according to any one of claims 1 to 8, wherein the outer surface of the insulating body is coated with a metal layer.

10. The lower isolating pole of claim 9 wherein the metal layer is a zinc layer.