High-reliability compact type environment-friendly gas insulation ring main unit

Abstract

The invention discloses a high-reliability compact type environment-friendly gas insulation ring main unit which comprises a gas tank and is characterized in that a three-position switch, a circuit breaker switch and an integrated mutual inductor are fixedly connected in the gas tank, a cable chamber is fixedly connected to the bottom of the gas tank, and a mechanism chamber is fixedly connected to the side face of the gas tank. A sealed three-station mechanism and a sealed circuit breaker mechanism are fixedly connected in the mechanism chamber, an instrument chamber is fixedly connected to the mechanism chamber, and a digital sensing unit is fixedly connected in the instrument chamber; the beneficial effects of the invention are that the device is small in size, saves the occupied space, is suitable for narrow power distribution rooms in large cities, and solves a compact problem; an integrated current and voltage bushing type mutual inductor is adopted, the functions of current, voltage and cable outgoing bushing are integrated, the integration degree is high, the mutual inductor adopts a low-power coil, and signal attenuation is small; a special-shaped copper pipe is adopted to replace a traditional copper rod, the problems of electric field and temperature rise are solved, and a high-protection operation structure is adopted to solve the reliability problem.

Description

Technical Field

[0001] This invention relates to the field of ring main unit technology, specifically to a highly reliable, compact, environmentally friendly gas-insulated ring main unit. Background Technology

[0002] With the accelerated construction of smart grids, the continuous improvement of distribution network automation, and the large-scale grid connection of distributed energy, distribution network systems are facing severe challenges in multiple dimensions, including power supply security, operational reliability, and economy. This places unprecedentedly high demands on the long-term intelligent operation and stability of ring main unit equipment. As the new urbanization strategy deepens, urban distribution network construction is facing increasingly scarce land resources, and power supply equipment installed in underground distribution rooms is susceptible to flooding. Therefore, the reliability and safety of power supply need continuous improvement. Traditional distribution equipment, due to its inherent defects such as large size and limited expansion capabilities, can no longer meet the special needs of space-constrained scenarios such as urban core areas, large commercial complexes, and underground environments. There is an urgent need to overcome space limitations through innovative, highly reliable, and compact designs. In traditional ring main units, the copper rods heat up rapidly during transmission, and sharp corners can easily cause sudden changes in the electric field, leading to discharge at the bottom plate of the gas tank, posing a safety hazard. Summary of the Invention

[0003] In view of the deficiencies in the existing technology, the present invention provides a highly reliable, compact, environmentally friendly gas-insulated ring main unit to solve the existing problems.

[0004] This invention is achieved through the following technical solution: a highly reliable, compact, environmentally friendly gas-insulated ring main unit, comprising a gas box, characterized in that: a three-position switch is fixedly connected inside the gas box, a circuit breaker switch is fixedly connected inside the gas box, an integrated current transformer is fixedly connected inside the gas box, an equalizing ring is fixedly connected to one end of the integrated current transformer, a cable compartment is fixedly connected to the bottom of the gas box, a mechanism compartment is fixedly connected to the side of the gas box, a sealed three-position mechanism and a sealed circuit breaker mechanism are fixedly connected inside the mechanism compartment, an instrument compartment is fixedly connected to the top of the mechanism compartment, and a digital sensing unit is fixedly connected inside the instrument compartment.

[0005] Preferably, a side plate is fixedly connected inside the air box, an inner reinforcing plate is fixedly connected to the side plate, a side expansion sleeve is fixedly connected to the side plate, and a special-shaped reinforcing rib is fixedly connected to the air box.

[0006] Preferably, the side expansion bushing is located above the three-position switch, the circuit breaker switch is located below the three-position switch, and the integrated current transformer is located below the circuit breaker switch.

[0007] Preferably, the sealed three-position mechanism is connected to the three-position switch via a cable dynamic seal, and the sealed circuit breaker mechanism is connected to the circuit breaker switch via a cable dynamic seal.

[0008] Preferably, the circuit breaker switch is connected to the equalizing ring via a conductive copper pipe, one end of the integrated current transformer is fixedly connected to a tapered cable sleeve, the tapered cable sleeve is connected to the power supply via a section of conductive copper pipe, the integrated current transformer is provided with two aviation connectors, and the integrated current transformer and the digital sensing unit are transmitted via aviation connectors.

[0009] Preferably, the conductive copper tube has several vent holes and is covered with a sulfide layer.

[0010] The beneficial effects of this invention are as follows: small size, saving space, suitable for small power distribution rooms in large cities, solving the compactness problem; adopting an integrated current and voltage bushing-type instrument transformer, integrating current, voltage, and cable outlet bushing functions, with a high degree of integration; the instrument transformer uses a low-power coil, resulting in low signal attenuation; using a special-shaped copper tube instead of a traditional copper rod to solve the electric field and temperature rise problems; using a special-shaped side-expanding bushing to solve the insulation problem between the high-voltage conductor and the side plate; adding an equalizing ring at the rear end of the bushing to solve the electric field problem at the junction of the bushing, air, and epoxy materials; and encasing the fastening screws inside the equalizing ring to avoid electric field abrupt changes caused by sharp corners, thus solving the phase-to-phase and phase-to-gas box bottom plate discharge problems. Attached Figure Description

[0011] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front view of the integrated current and voltage bushing transformer of the present invention; Figure 3 Left view of the integrated current and voltage bushing transformer of the present invention. Figure 4 This is a right view of the integrated current and voltage bushing transformer of the present invention. Figure 5 For the present invention Figure 4 Cross-sectional view at point AA; Figure 6 This is a schematic diagram of the right-side structure of the air box of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of the structure at point B in the middle; Figure 8 This is a schematic diagram of the main structure of the air box of the present invention; Figure 9 For the present invention Figure 8 Cross-sectional view at CC; Figure 10 For the present invention Figure 9 Enlarged view of the structure at point D; Figure 11 This is a schematic diagram of the equalizing ring structure of the present invention.

[0013] In the attached diagram, 1 is the instrument compartment, 2 is the digital sensing unit, 3 is the mechanism compartment, 4 is the sealed three-position mechanism, 5 is the sealed circuit breaker mechanism, 6 is the cable compartment, 7 is the side expansion sleeve, 8 is the gas box, 9 is the conductive copper pipe, 10 is the integrated current transformer, 11 is the tapered cable sleeve, 12 is the aviation plug interface, 13 is the exhaust port, 14 is the equalizing ring, 15 is the side plate, 16 is the inner reinforcing plate, 17 is the special-shaped reinforcing rib, 18 is the three-position switch, and 19 is the circuit breaker switch. Detailed Implementation

[0014] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0015] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0016] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” may be used herein to describe the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific implementation of the present invention will be described in detail below with reference to specific embodiments: such as Figures 1-11 The present invention is achieved through the following technical solution: a highly reliable, compact, environmentally friendly gas-insulated ring main unit, such as... Figure 1 and 8 As shown, this embodiment includes a gas box 8, a three-position switch 18 fixedly connected inside the gas box 8, a circuit breaker switch 19 fixedly connected inside the gas box 8, an integrated current transformer 10 fixedly connected inside the gas box 8, and an equalizing ring 14 fixedly connected to one end of the integrated current transformer 10, as shown. Figure 7 As shown, in this embodiment, a side plate 15 is fixedly connected inside the gas box 8, an inner reinforcing plate 16 is fixedly connected to the side plate 15, a side expansion sleeve 7 is fixedly connected to the side plate 15, and a special-shaped reinforcing rib 17 is fixedly connected to the gas box 8. The side expansion sleeve 7 is located above the three-position switch 18. The side expansion sleeve 7 adopts a concave design and an inner reinforcing plate 16 to solve the problem of gas box 8 deformation after inflation, and the problem of air leakage due to poor sealing between the side expansion sleeve 7 and the box body sealing ring. The side plate 15 is welded with rounded corner steel to replace the industry's stainless steel C-shaped bending structure. The use of rounded corner steel has two advantages: first, it has good bending strength and solves the problem of gas box 8 deformation with a smaller shape; second, it solves the electric field problem and further shortens the width of the gas box and saves space. The use of the side expansion sleeve 7 solves the problem of insulation of the high voltage conductor to the side plate 15. The circuit breaker switch 19 is located below the three-position switch 18, and the integrated current transformer 10 is located below the circuit breaker switch 19. The bottom of the gas box 8 is fixedly connected to the cable chamber 6, and the side of the gas box 8 is fixedly connected to the mechanism chamber 3. The mechanism chamber 3 is fixedly connected to the sealed three-position mechanism 4 and the sealed circuit breaker mechanism 5. The sealed three-position mechanism 4 is connected to the three-position switch 18 via a cable dynamic seal, and the sealed circuit breaker mechanism 5 is connected to the circuit breaker switch 19 via a cable dynamic seal. The mechanism chamber 3 is fixedly connected to the instrument chamber 1, and the instrument chamber 1 is fixedly connected to the digital sensing unit 2. The sealed three-position mechanism 4 and the sealed circuit breaker mechanism 5 adopt the IP67 protection level to solve the problems of the mechanism not operating due to environmental influences during equipment operation, such as rust, short service life, and inability to operate under flood conditions. like Figure 6 As shown, in this embodiment, the circuit breaker switch 19 is connected to the equalizing ring 14 through a conductive copper tube 9. Several vent holes 13 are opened on the conductive copper tube 9 to solve the problem of internal filling during the processing of the conductive copper tube 9 (to avoid bending and deformation) and internal heat dissipation (to exhaust hot air) during equipment operation; the conductive copper tube 9 is covered with a sulfide layer to solve the problem of compact insulation. like Figure 2 and Figure 3As shown, in this embodiment, one end of the integrated current transformer 10 is fixedly connected to a tapered cable sleeve 11. The tapered cable sleeve 11 is connected to the power supply through a section of conductive copper pipe 9. The integrated current transformer 10 is provided with two aviation connectors 12. The integrated current transformer 10 and the digital sensing unit 2 are connected and transmitted through the aviation connectors 12. The integrated current transformer 10 adopts an integrated current and voltage bushing type current transformer, which integrates the functions of current, voltage, and cable outlet bushing. It has a high degree of integration. The current transformer uses a low-power coil, which has small signal attenuation and integrates the function of voltage transformer. The signal transmission between the integrated current transformer 10 and the digital sensing unit 2 is carried out through aviation connectors. It is sealed, safe and reliable. It has an integrated configuration, full functions, low cost, small space occupation, and realizes digital functions. By adding an equalizing ring 14, the electric field problem at the junction of the bushing, air and epoxy is solved. The fastening screw is wrapped inside the equalizing ring 14 to avoid the electric field change caused by sharp corners and solve the discharge between phases and the bottom plate of the gas box 8.

[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A highly reliable, compact, environmentally friendly gas-insulated ring main unit, comprising a gas box (8), characterized in that: The gas box (8) is fixedly connected to a three-position switch (18), a circuit breaker switch (19), an integrated current transformer (10), an equalizing ring (14) is fixedly connected to one end of the integrated current transformer (10), a cable chamber (6) is fixedly connected to the bottom of the gas box (8), a mechanism chamber (3) is fixedly connected to the side of the gas box (8), a sealed three-position mechanism (4) and a sealed circuit breaker mechanism (5) are fixedly connected to the mechanism chamber (3), an instrument chamber (1) is fixedly connected to the top of the mechanism chamber (3), and a digital sensing unit (2) is fixedly connected to the instrument chamber (1).

2. The highly reliable, compact, environmentally friendly gas-insulated ring main unit according to claim 1, characterized in that: The gas box (8) is fixedly connected to a side plate (15), a lining reinforcement plate (16) is fixedly connected to the side plate (15), a side expansion sleeve (7) is fixedly connected to the side plate (15), and a special-shaped reinforcing rib (17) is fixedly connected to the gas box (8).

3. The highly reliable, compact, environmentally friendly gas-insulated ring main unit according to claim 2, characterized in that: The side expansion bushing (7) is located above the three-position switch (18), the circuit breaker switch (19) is located below the three-position switch (18), and the integrated transformer (10) is located below the circuit breaker switch (19).

4. The highly reliable, compact, environmentally friendly gas-insulated ring main unit according to claim 1, characterized in that: The sealed three-position mechanism (4) is connected to the three-position switch (18) in the gas box (8) via a cable dynamic seal, and the sealed circuit breaker mechanism (5) is connected to the circuit breaker switch (19) in the gas box (8) via a cable dynamic seal.

5. The highly reliable, compact, environmentally friendly gas-insulated ring main unit according to claim 1, characterized in that: The circuit breaker switch (19) is connected to the equalizing ring (14) through a conductive copper pipe (9). One end of the integrated current transformer (10) is fixedly connected to the tapered cable sleeve (11). The tapered cable sleeve (11) is connected to the power supply through a section of conductive copper pipe (9). The integrated current transformer (10) is provided with two aviation connectors (12). The integrated current transformer (10) and the digital sensing unit (2) are connected and transmitted through the aviation connectors (12).

6. The highly reliable, compact, environmentally friendly gas-insulated ring main unit according to claim 5, characterized in that: Several vent holes (13) are opened on the conductive copper tube (9), and a sulfidation layer is applied to the outside of the conductive copper tube (9).

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