A solid insulation base and a switching unit using the same

Abstract

The application relates to a solid insulation base and a switch unit using the same, the solid insulation base comprising a sleeve structure and a flat plate support structure, the sleeve structure being arranged at the lower part of the flat plate support structure; the flat plate support structure comprising a base body, three grounding contacts and three insulation columns arranged on the base body; the sleeve structure comprising A, B and C three-phase conductive rods and electric induction nets arranged around the A, B and C three-phase conductive rods respectively; the A, B and C three-phase conductive rods being extended downwards from the bottom of the center of the flat plate support structure, being bent and extended, and being connected with the three insulation columns respectively at the bottom of the flat plate support structure. The application is designed in the structure of the solid insulation base, so that the size is reduced, the creepage distance is more sufficient, and the reliability is higher; and the smaller cabinet depth design can be realized under the condition of sufficient cable chamber depth space, so as to be compatible with the current transformer with the maximum thickness.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage electrical apparatus, in particular to a solid insulation base and a switch unit using the same. BACKGROUND

[0002] The solid insulation base is a core component of a new generation of solid insulation ring main unit. The solid insulation base in the prior art has a flat plate structure, and is solidly sealed with three-phase inlet and outlet conductive rods and grounding contacts. The bushing is arranged in front, and is used in cooperation with a three-position insulation box. However, the solid insulation base in the prior art has the following disadvantages:

[0003] (1) Generally having a flat plate structure, the creepage distance threshold is small, and the structure has a large volume;

[0004] (2) The bushing in the solid insulation base is generally arranged in front, which consumes the cable chamber space, and the cabinet depth size is generally large, which is not conducive to product miniaturization;

[0005] (3) The insulation body structure is complex, the local material uniformity is poor, and pouring defects are easy to occur, or inconsistent shrinkage causes poor bonding force with the embedded parts, which is easy to cause partial discharge;

[0006] (4) The bushing length is short, and the compatibility of the current transformer with a small transformation ratio, a phase-zero sequence composite type, and the like is poor. SUMMARY

[0007] Based on the above problems of the prior art, the present application aims to provide a solid insulation base and a switch unit using the same. Through the structural design of the solid insulation base, the size is reduced, the creepage distance is more sufficient, and the reliability is higher. Moreover, the smaller cabinet depth design can be realized under the condition of sufficient cable chamber depth space, so as to be compatible with the current transformer with the maximum thickness.

[0008] To achieve the above-mentioned purpose, according to one aspect of the present application, a solid insulation base is provided, which comprises a bushing structure and a flat plate support structure, the bushing structure is arranged at the lower part of the flat plate support structure;

[0009] The flat plate support structure comprises a base body, and three grounding contacts and three insulation columns arranged on the base body;

[0010] The bushing structure comprises A, B, and C three-phase conductive rods, and an electric field sensing induction net arranged around the A, B, and C three-phase conductive rods, respectively.

[0011] The A, B, and C three-phase conductive rods are bent and extended downward from the bottom of the center of the flat plate support structure, and are connected with the three insulation columns at the bottom of the flat plate support structure, respectively.

[0012] Furthermore, the sleeve structure connects the front connector of the cable and the incoming and outgoing line loops.

[0013] Furthermore, the three-phase conductive bars A, B, and C are all bent structures that are bent multiple times.

[0014] Furthermore, the three insulating columns are columnar structures and are arranged in parallel on the base body;

[0015] The bottom of each insulating column is recessed toward the interior of the base body to form a square cavity structure.

[0016] Furthermore, the columnar structure of each insulating column forms an umbrella-shaped structure along the circumferential direction.

[0017] Furthermore, the three grounding contacts correspond to the three insulating columns respectively.

[0018] According to another aspect of the present invention, a switch unit with a solid insulating base is provided, comprising a solid insulating base and a switch unit; the switch unit is arranged on the solid insulating base; wherein,

[0019] The switch unit includes a three-position knife switch, an insulation box and a pole;

[0020] The solid insulating base and the insulating box are assembled and sealed by a flat plate, and the switch unit is installed on the solid insulating base through the three-position knife switch.

[0021] Furthermore, each phase switch in the three-position switch is electrically connected to the A, B, and C three-phase conductive bars of the solid insulation base through a detachable contact base.

[0022] Furthermore, the three-position knife switch is rotated at a preset angle under the support of the solid insulating base to realize the opening and closing of the isolating switch and the grounding switch in the switch unit.

[0023] In summary, the application provides a solid insulation base and a switch unit using the same, the solid insulation base comprising a bushing structure and a flat plate support structure, the bushing structure being arranged at the lower part of the flat plate support structure; the flat plate support structure comprising a base body, and three grounding contacts and three insulation columns arranged on the base body; the bushing structure comprising A, B and C three-phase conductive rods, and electrically induced sensing nets arranged around the A, B and C three-phase conductive rods respectively; the A, B and C three-phase conductive rods extending downward from the bottom of the center of the flat plate support structure and being connected with the three insulation columns respectively at the bottom of the flat plate support structure. The technical scheme provided by the application, through the structural design of the solid insulation base, makes the size thereof smaller, the creepage distance more sufficient, and the reliability higher; and can ensure that the smaller cabinet depth design is realized under the condition of sufficient cable chamber depth space, so as to be compatible with the current transformer with the maximum thickness. The application has the following beneficial technical effects:

[0024] (1) applied to a miniaturized solid cabinet, the cabinet width can be up to 325mm.

[0025] (2) by arranging the bushing in the center, compared with the prior art generally using the front positioning scheme, the cabinet depth space is saved by 100-150mm, which is beneficial to the miniaturization of the whole cabinet.

[0026] (3) the inter-phase sink cavity structure is adopted, the insulation support column is provided with a skirt, the creepage distance is more sufficient, and the insulation performance is more reliable.

[0027] (4) by integrally pouring the three-phase incoming and outgoing line conductive rods, the modularization degree is higher, and it is more suitable for intelligent manufacturing.

[0028] (5) the long bushing structure is adopted, which can be compatible with the phase current transformer with the thickness of 65-120mm and the phase and zero sequence composite current transformer, and the application range is wider.

[0029] (6) the solid insulation base of the application effectively avoids the poor electrical contact of the knife switch caused by the displacement or skew of the contact by sealing only the incoming and outgoing line conductive body and separately installing the isolation contact. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the overall structure schematic of the solid insulation base of the embodiment of the application Figure 1 ;

[0031] Figure 2 is the overall structure schematic of the solid insulation base of the embodiment of the application Figure 2 ;

[0032] Figure 3 is the overall structure schematic of the switch unit of the embodiment of the application.

[0033] Explanation of the accompanying reference numerals: 1-base body, 2-A phase conductive rod, 3-B phase conductive rod, 4-C phase conductive rod, 5-grounding contact, 6-electric display induction network, 7-sunk cavity, 8-insulating column, 9-umbrella skirt, 10-charged induction ring interface; 11-solid insulation base; 12-three-position knife switch; 13-insulating box; 14-pole. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0035] The following is a detailed description of the technical solution of the present invention with reference to the accompanying drawings. According to one embodiment of the present invention, a solid insulation base is provided. The solid insulation base is the core insulation component of a new generation of solid insulation ring main unit (RMU). It is used to seal the conductors of incoming and outgoing lines and the grounding contacts, and to support the three-position isolation / grounding switch. Figure 1 and Figure 2 Schematic diagrams of the overall structure of a solid insulation base according to an embodiment of the present invention are shown from different angles. The solid insulation base includes a sleeve structure and a flat support structure, with the sleeve structure disposed below the flat support structure. The solid insulation base can be injection molded using an epoxy resin APG process, with the sleeve structure at the bottom and the flat support structure at the top. The three-phase conductive components are cast in a three-in-one, integrated manner, and the outer surfaces are coated with zinc or semi-conductive graphite for grounding and shielding. The flat support structure includes a base body 1, three grounding contacts 5, and three insulating posts 8 disposed on the base body 1. The sleeve structure includes an A-phase conductive rod 2, a B-phase conductive rod 3, and a C-phase conductive rod 4, as well as an electric induction network 6 disposed around each of the A-phase conductive rod 2, the B-phase conductive rod 3, and the C-phase conductive rod 4. The A-phase conductive rod 2, the B-phase conductive rod 3, and the C-phase conductive rod 4 extend downward from the center of the flat support structure, bending downward and interconnecting with the three insulating posts 8 at the bottom of the flat support structure. The bushing structure is used to connect the front connector of the cable and the incoming and outgoing line loops. The bushing structure is used for switching incoming and outgoing lines. To distinguish it from other bushing structures, it is sometimes called an incoming and outgoing line bushing. In engineering applications, the cable is plugged into the bushing through the front interface of the cable to transmit current. By adopting a central layout of the bushing, a smaller cabinet depth design can be achieved with sufficient cable room depth space, and it is compatible with current transformers with a maximum thickness of, for example, 120 mm. The A-phase conductive rod 2, the B-phase conductive rod 3 and the C-phase conductive rod 4 are all bent structures, and the bent structure is a special-shaped bent structure that has been bent multiple times. As Figure 1As shown, the three insulating columns 8 are columnar structures and are arranged in parallel on the base body; the bottom of each insulating column 8 is recessed into the interior of the base body 1 to form a square cavity structure 7. The solid insulating base of the embodiment of the present invention adopts a miniaturized sinking cavity structure design, which is reduced to the extreme size in the industry, with more sufficient creepage distance and higher reliability. The columnar structure of each insulating column 8 forms an umbrella skirt structure 9 along the circumferential direction. The three grounding contacts 5 correspond to each other in the three insulating columns 8. As shown Figure 2 As shown, a charged induction ring interface 10 is provided on the electric display induction network 6. The solid insulating base of the embodiment of the present invention realizes a miniaturized structural size through the above design, and can realize the maximum outer contour: 315mm wide, 490mm long, and the distance between the sleeve axis and the top surface of the base is 155mm. The three-phase conductive rods are bent into shape and cast in three-in-one, with a phase spacing of 107mm in the width direction and a phase spacing of 150mm in the depth direction. The lower bent sleeve is arranged in the center of the flat support structure and is flush with the B-phase insulating column on the left and right. A rectangular sinking structure with a depth of 53mm is provided at the bottom of the three-phase insulating column; the insulating support column is provided with a lateral umbrella skirt; the grounding contact 5 is a three-phase integrated structure, which is sealed in this product; a zinc layer or semi-conductive graphite is coated on the outer surface of the pole insulator and is reliably grounded.

[0036] According to another embodiment of the present invention, a switch unit having a solid insulating base is provided. Figure 3 The figure shows the overall structure of the switch unit, which includes a solid insulating base 11 and a switch unit; the switch unit is arranged on the solid insulating base. The switch unit includes a three-position knife switch 12, an insulating box 13 and a pole 14; the solid insulating base 11 and the insulating box 13 are assembled by flat plate sealing and fastened by screws around the perimeter. The switch unit is installed on the solid insulating base 11 through the three-position knife switch 12. The knife switches of each phase in the three-position knife switch 12 are electrically connected to the A, B, and C three-phase conductive bars of the solid insulating base 11 through a detachable contact seat. The three-position knife switch rotates at a preset angle under the support of the solid insulating base to realize the opening and closing of the isolating switch and the grounding switch in the switch unit. The preset angle is, for example, ±60°.

[0037] In summary, the present invention relates to a solid insulating base and a switch unit using the same, the solid insulating base includes a bushing structure and a flat plate support structure, the bushing structure is arranged at the lower part of the flat plate support structure; the flat plate support structure includes a base body, and three grounding contacts and three insulating columns arranged on the base body; the bushing structure includes three-phase conductive rods A, B, and C, and an electric induction network respectively arranged around the three-phase conductive rods A, B, and C; the three-phase conductive rods A, B, and C extend from the bottom of the center of the flat plate support structure, bend downward, and are respectively interconnected with the three insulating columns at the bottom of the flat plate support structure. The technical solution provided by the present invention reduces its size, increases its creepage distance, and increases its reliability through the structural design of the solid insulating base; and can ensure a smaller cabinet depth design with sufficient cable room depth space to be compatible with current transformers of maximum thickness.

[0038] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or illustrative of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention. In addition, the appended claims are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A solid insulating base, characterized in that: It comprises a sleeve structure and a flat plate support structure, wherein the sleeve structure is arranged at the lower part of the flat plate support structure; The flat plate support structure includes a base body, and three grounding contacts and three insulating columns provided on the base body; The bushing structure includes three-phase conductive rods A, B, and C, and electric induction networks respectively arranged around the three-phase conductive rods A, B, and C; The A, B, and C three-phase conductive rods extend from the bottom of the center of the flat plate support structure, bend downward, and are respectively connected to the three insulating columns at the bottom of the flat plate support structure; the three insulating columns are columnar structures and are arranged side by side on the base body; the bottom of each insulating column is recessed into the interior of the base body to form a square sinking cavity structure.

2. The solid insulating base according to claim 1, characterized in that: The sleeve structure connects the front connector of the cable and the incoming and outgoing line loops.

3. The solid insulating base according to claim 2, characterized in that: The three-phase conductive bars A, B, and C all have a bent structure with multiple bends.

4. The solid insulating base according to claim 3, characterized in that: The columnar structure of each insulating column forms an umbrella-shaped structure along the circumferential direction.

5. The solid insulating base according to claim 4, characterized in that: The three grounding contacts correspond to the three insulating columns respectively.

6. A switch unit with a solid insulating base, characterized in that: It includes a solid insulating base and a switch unit; the switch unit is arranged on the solid insulating base; wherein, The switch unit includes a three-position knife switch, an insulation box and a pole; the solid insulation base is a solid insulation base according to any one of claims 1 to 5; The solid insulating base and the insulating box are assembled and sealed by a flat plate, and the switch unit is installed on the solid insulating base through the three-position knife switch.

7. The switch unit according to claim 6, characterized in that Each phase knife switch in the three-position knife switch is electrically connected to the A, B, and C three-phase conductive bars of the solid insulation base through a detachable contact seat.

8. The switch unit according to claim 7, characterized in that The three-position knife switch rotates at a preset angle under the support of the solid insulating base to realize the opening and closing of the isolating switch and the grounding switch in the switch unit.

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