A neutral-point based grounding transformer

Abstract

This utility model relates to the field of transformer technology, and in particular to a neutral-point grounding transformer. In this application, the A-phase, B-phase, and C-phase lead-out cables are all threaded through the box cover plate, and then electrically connected to the A-phase winding via the A-phase lead-out cable, the B-phase winding via the B-phase lead-out cable, and the C-phase winding via the C-phase lead-out cable. All A-phase, B-phase, and C-phase lead-out cables are electrically connected to a shorting rod, and then electrically connected to the shorting rod via a neutral point cable. The center point cable is used for electrical connection to an external grounding point. By placing each current transformer in a common box, the structure of the transformer body is simplified, and the risks associated with placing the current transformers on the transformer body are reduced. Furthermore, compared to the traditional structure with three bushings, this application only uses one common box, reducing the number of neutral point bushings and simplifying the structure.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a grounding transformer based on a neutral point. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. The main components of a transformer are: primary coil, secondary coil, and iron core (magnetic core). The main functions of a transformer are: voltage transformation, current transformation, impedance transformation, isolation, and voltage stabilization (magnetic saturation transformer), etc.

[0003] Transformers need to have a neutral point. The existing conventional neutral point lead-out structure is as follows: the neutral point requires three bushings, and the cables leading out from the three neutral points are passed through the three bushings respectively. This structure makes the transformer body structure complicated and is not conducive to later maintenance. Utility Model Content

[0004] The main purpose of this utility model is to provide a neutral point-based grounding transformer, which aims to solve the problem that the existing conventional neutral point lead wire structure is complex and not conducive to later maintenance.

[0005] To achieve the above objectives, the technical solution proposed by this utility model is as follows:

[0006] A neutral-point grounding transformer includes a transformer housing, a common-line box, a raised cylinder, an outgoing conduit, an A-phase lead-out cable, a B-phase lead-out cable, a C-phase lead-out cable, a shorting rod, a neutral point cable, and A-phase mutual inductors, B-phase mutual inductors, and C-phase mutual inductors. The transformer housing includes a horizontally arranged cover plate. An A-phase winding, a B-phase winding, and a C-phase winding are disposed within the transformer housing. The common-line box is disposed on the cover plate. The shorting rod, the A-phase mutual inductors, the B-phase mutual inductors, and the C-phase mutual inductors are all disposed within the common-line box. The A-phase lead-out cable, the B-phase lead-out cable, and the C-phase lead-out cable all pass through the cover plate. One end of the A-phase lead-out cable is electrically... One end of the phase A cable is electrically connected to the A-phase winding, and the other end of the A-phase cable extends into the collinear box and is electrically connected to the shorting rod; one end of the phase B cable is electrically connected to the B-phase winding, and the other end of the B-phase cable extends into the collinear box and is electrically connected to the shorting rod; one end of the phase C cable is electrically connected to the C-phase winding, and the other end of the C-phase cable extends into the collinear box and is electrically connected to the shorting rod; the raising cylinder is disposed on the top of the collinear box; the outlet pipe is connected to the raising cylinder; one end of the neutral point cable is electrically connected to the shorting rod, and the other end of the neutral point cable passes through the raising cylinder and extends into the outlet pipe.

[0007] Preferably, the A-phase lead cable passes through the A mutual inductor; the B-phase lead cable passes through the B mutual inductor; and the C-phase lead cable passes through the C mutual inductor.

[0008] Preferably, it further includes a first connecting rod and a second connecting rod; both the first connecting rod and the second connecting rod are disposed within the collinear box; the shorting rod connects the first connecting rod and the second connecting rod; the shorting rod is horizontally disposed; the shorting rod is a metal rod.

[0009] Preferably, it further includes a clamping component; the clamping component includes a first clamping plate, a second clamping plate, a threaded rod, and a knob; both the first clamping plate and the second clamping plate are located inside the outlet tube; the first clamping plate is fixedly connected to the inner wall of the outlet tube; a first threaded hole is provided through the tube wall of the outlet tube; the threaded rod is screwed into the first threaded hole; one end of the threaded rod extending into the outlet tube is rotatably connected to the second clamping plate; the knob is provided at the end of the threaded rod outside the outlet tube; the first clamping plate and the second clamping plate are used to clamp and fix the neutral point cable.

[0010] Preferably, the clamping component further includes a first slide rod and a second slide rod; both the first slide rod and the second slide rod are fixedly connected to the side of the first clamping plate facing the second clamping plate; the first slide rod and the second slide rod are parallel to each other; the second clamping plate is slidably sleeved on the first slide rod and the second slide rod; the central axis of the threaded rod is parallel to the first slide rod; the central axis of the threaded rod is perpendicular to the central axis of the lifting cylinder.

[0011] Preferably, the neutral point cable is passed between the first slide bar and the second slide bar; the side of the first clamping plate facing the second clamping plate is recessed and is provided with a rubber buffer layer; the side of the second clamping plate facing the first clamping plate is recessed and is provided with a rubber buffer layer.

[0012] Preferably, it also includes a first bolt; the bottom of the collinear box is provided with a first edge plate for abutting against the upper surface of the box cover; the first edge plate has a plurality of second threaded holes, and the box cover has a plurality of third threaded holes; the second threaded holes and the third threaded holes correspond one to one; the first bolt is used to engage with the second threaded holes and the corresponding third threaded holes to fix the collinear box to the box cover.

[0013] Preferably, the top of the collinear box has a through hole; the lifting cylinder is disposed in the through hole; the lifting cylinder is vertically arranged.

[0014] Preferably, it also includes a second bolt; the bottom of the lifting cylinder is provided with a second edge plate for abutting against the upper surface of the collinear box; the second edge plate has a plurality of fourth threaded holes, and the top of the collinear box has a plurality of fifth threaded holes; the fourth threaded holes and the fifth threaded holes correspond one to one; the second bolt is used to engage with the fourth threaded holes and the corresponding fifth threaded holes to fix the lifting cylinder to the collinear box.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] The neutral-point grounding transformer proposed in this invention is simpler and easier to maintain than the conventional neutral-point lead-out structure. In this application, the A-phase, B-phase, and C-phase lead-out cables are all threaded through the box cover plate, and then electrically connected to the A-phase winding via the A-phase lead-out cable, the B-phase winding via the B-phase lead-out cable, and the C-phase winding via the C-phase lead-out cable. All A-phase, B-phase, and C-phase lead-out cables are electrically connected to a shorting rod, and then connected to the neutral point... The cable is electrically connected to the shorting rod, and the center point cable is used for electrical connection to the external grounding point. In this application, each current transformer is set in a common box, which simplifies the structure of the transformer body, reduces the risk of setting the current transformer on the transformer body, and is beneficial for maintenance and modification during later operation. At the same time, compared with the traditional scheme with 3 bushings, this application only sets 1 common box, which reduces the number of neutral point bushings, reduces costs, simplifies the structure, and reduces the risk of neutral point open circuit caused by the bushing not being securely shorted externally. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the external structure of an embodiment of the neutral-point-based grounding transformer proposed in this utility model;

[0019] Figure 2 This is a partial structural schematic diagram of an embodiment of the neutral-point-based grounding transformer proposed in this utility model;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the raised cylinder in an embodiment of a neutral-point grounding transformer proposed in this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 110. Transformer housing; 120. Common-line box; 130. Elevating cylinder; 140. Outgoing conduit; 150. Neutral point cable; 160. Box cover plate; 170. First edge plate; 180. First bolt; 190. Second edge plate; 210. Second bolt; 220. A-phase lead cable; 230. B-phase lead cable; 240. C-phase lead cable; 250. Shorting rod; 260. First connecting rod; 270. Second connecting rod; 280. A mutual inductor; 290. B mutual inductor; 310. C mutual inductor; 320. First clamping plate; 330. Second clamping plate; 340. Threaded rod; 350. Knob; 360. First sliding rod; 370. Second sliding rod; 380. Through hole.

[0023] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0026] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] This invention proposes a grounding transformer based on a neutral point.

[0030] As attached Figure 1 - Appendix Figure 3 As shown, in one embodiment of a neutral-point-based grounding transformer proposed in this utility model, the neutral-point-based grounding transformer includes a transformer housing 110, a common-line box 120, a raised cylinder 130, an outlet pipe 140, an A-phase lead cable 220, a B-phase lead cable 230, a C-phase lead cable 240, a shorting rod 250, a neutral point cable 150, an A-phase mutual inductor 280, a B-phase mutual inductor 290, and a C-phase mutual inductor 310; the transformer housing 110 includes a horizontally arranged box cover plate 160; the transformer housing 110 is provided with an A-phase winding (not shown), a B-phase winding (not shown), and a C-phase winding (not shown); the common-line box 120 is disposed on the box cover plate 160; the shorting rod 250, the A-phase mutual inductor 280, the B-phase mutual inductor 290, and the C-phase mutual inductor 310 are all disposed in the common-line box 120; the A-phase lead cable 220, the B-phase lead cable 230, the C-phase mutual inductor 240, the A-phase lead cable 240, the B-phase lead cable 250, the neutral point cable 150, an A-phase mutual inductor 280, a B-phase mutual inductor 290, and a C-phase mutual inductor 310; the A-phase lead cable 220, the B-phase lead cable 230, the C-phase mutual inductor 290, and the C-phase mutual inductor 310 are all disposed in the common-line box 120; the A-phase lead cable 220, the B-phase lead cable 290, the C-phase mutual inductor 290, and the C-phase mutual inductor Both phase C cable 230 and phase C cable 240 are threaded through box cover plate 160; one end of phase A cable 220 is electrically connected to phase A winding, and the other end of phase A cable 220 extends into common box 120 and is electrically connected to shorting rod 250; one end of phase B cable 230 is electrically connected to phase B winding, and the other end of phase B cable 230 extends into common box 120 and is electrically connected to shorting rod 250; phase C cable 240... One end of the output cable 240 is electrically connected to the C-phase winding, and the other end of the C-phase output cable 240 extends into the common box 120 and is electrically connected to the shorting rod 250; the lifting cylinder 130 is set on the top of the common box 120; the output pipe 140 is connected to the lifting cylinder 130; one end of the neutral point cable 150 is electrically connected to the shorting rod 250, and the other end of the neutral point cable 150 passes through the lifting cylinder 130 and extends into the output pipe 140.

[0031] The neutral-point grounding transformer proposed in this utility model is simpler than the conventional neutral-point lead-out structure, and is easier to maintain later. In this application, the A-phase lead-out cable 220, B-phase lead-out cable 230, and C-phase lead-out cable 240 are all passed through the box cover plate 160, and then electrically connected to the A-phase winding via the A-phase lead-out cable 220, to the B-phase winding via the B-phase lead-out cable 230, and to the C-phase winding via the C-phase lead-out cable 240. All A-phase lead-out cables 220, B-phase lead-out cables 230, and C-phase lead-out cables 240 are electrically connected to the shorting rod 25. 0, and then electrically connected to the shorting rod 250 via the neutral point cable 150, and the center point cable is used for electrical connection to the external grounding point; in this application, each current transformer is set in the common box 120, which simplifies the structure of the transformer body, reduces the risk brought about by setting the current transformer on the transformer body, and is conducive to maintenance and modification in later operation; at the same time, compared with the structure of setting 3 bushings in the traditional scheme, this application only sets 1 common box 120, which reduces the number of neutral point bushings, reduces costs, simplifies the structure, and reduces the risk of neutral point open circuit caused by the bushing not being firmly shorted externally.

[0032] Furthermore, the aforementioned A-phase lead cable 220 passes through the A mutual inductor 280; the B-phase lead cable 230 passes through the B mutual inductor 290; and the C-phase lead cable 240 passes through the C mutual inductor 310. This neutral-point-based grounding transformer also includes a first connecting rod 260 and a second connecting rod 270; both the first connecting rod 260 and the second connecting rod 270 are housed within the collinear box 120; a shorting rod 250 connects the first connecting rod 260 and the second connecting rod 270; the shorting rod 250 is horizontally positioned; and the shorting rod 250 is a metal rod (e.g., a copper rod). This neutral-point-based grounding transformer also includes a clamping component; the clamping component includes a first clamping plate 320, a second clamping plate 330, a threaded rod 340, and a knob 350; both the first clamping plate 320 and the second clamping plate 330 are located inside the outlet pipe 140; the first clamping plate 320 is fixedly connected to the inner wall of the outlet pipe 140; a first threaded hole (not labeled) is provided through the pipe wall of the outlet pipe 140; the threaded rod 340 is screwed into the first threaded hole; one end of the threaded rod 340 extending into the outlet pipe 140 is rotatably connected to the second clamping plate 330; a knob 350 is provided at the end of the threaded rod 340 outside the outlet pipe 140; the first clamping plate 320 and the second clamping plate 330 are used to clamp and fix the neutral point cable 150.

[0033] Meanwhile, the clamping components also include a first slide rod 360 and a second slide rod 370; both the first slide rod 360 and the second slide rod 370 are fixedly connected to the side of the first clamping plate 320 facing the second clamping plate 330; the first slide rod 360 and the second slide rod 370 are parallel to each other; the second clamping plate 330 is slidably sleeved on the first slide rod 360 and the second slide rod 370; the central axis of the threaded rod 340 is parallel to the first slide rod 360; the central axis of the threaded rod 340 is perpendicular to the central axis of the lifting cylinder 130. The neutral point cable 150 passes between the first slide rod 360 and the second slide rod 370; the side of the first clamping plate 320 facing the second clamping plate 330 is concave and is provided with a rubber buffer layer (not shown); the side of the second clamping plate 330 facing the first clamping plate 320 is concave and is provided with a rubber buffer layer (not shown).

[0034] The above technical solution can clamp and fix the neutral point cable 150 passing through the lifting cylinder 130. In specific use, by turning the knob 350, the threaded rod 340 is driven to rotate, thereby driving the second clamping plate 330 to move closer to or away from the first clamping plate 320, thereby clamping and fixing the neutral point cable 150.

[0035] In addition, this neutral-point-based grounding transformer also includes a first bolt 180; the bottom of the collinear box 120 is provided with a first edge plate 170 for abutting against the upper surface of the box cover plate 160; the first edge plate 170 has a plurality of second threaded holes (not shown), and the box cover plate 160 has a plurality of third threaded holes (not shown); the second threaded holes and the third threaded holes correspond one-to-one; the first bolt 180 is used to engage with the second threaded holes and the corresponding third threaded holes to fix the collinear box 120 to the box cover plate 160. The top of the collinear box 120 has a through hole 380; a lifting cylinder 130 covers the through hole 380; the lifting cylinder 130 is vertically arranged.

[0036] Meanwhile, this neutral-point-based grounding transformer also includes a second bolt 210; the bottom of the raised cylinder 130 is provided with a second edge plate 190 for abutting against the upper surface of the common-line box 120; the second edge plate 190 has multiple fourth threaded holes (not shown), and the top of the common-line box 120 has multiple fifth threaded holes (not shown); the fourth threaded holes and the fifth threaded holes correspond one-to-one; the second bolt 210 is used to engage with the fourth threaded holes and the corresponding fifth threaded holes to fix the raised cylinder 130 to the common-line box 120. The outlet pipe 140 is close to the top of the raised cylinder 130, and the central axis of the outlet pipe 140 is horizontal.

[0037] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A neutral point based grounding transformer, characterized by, The transformer includes a transformer housing, a common-line box, a raised cylinder, an outlet pipe, A-phase lead-out cables, B-phase lead-out cables, C-phase lead-out cables, a shorting rod, a neutral point cable, and A-phase mutual inductors, B-phase mutual inductors, and C-phase mutual inductors. The transformer housing includes a horizontally arranged cover plate. A-phase windings, B-phase windings, and C-phase windings are installed inside the transformer housing. The common-line box is located on the cover plate. The shorting rod, A-phase mutual inductors, B-phase mutual inductors, and C-phase mutual inductors are all located within the common-line box. The A-phase lead-out cables, B-phase lead-out cables, and C-phase lead-out cables all pass through the cover plate. One end of the A-phase lead-out cable is electrically connected to the A-phase winding. The system comprises a group in which one end of phase A cable extends into the collinear box and is electrically connected to the shorting rod; one end of phase B cable is electrically connected to phase B winding, and the other end of phase B cable extends into the collinear box and is electrically connected to the shorting rod; one end of phase C cable is electrically connected to phase C winding, and the other end of phase C cable extends into the collinear box and is electrically connected to the shorting rod; a raised cylinder is disposed on the top of the collinear box; an outlet pipe is disposed in connection with the raised cylinder; one end of the neutral point cable is electrically connected to the shorting rod, and the other end of the neutral point cable passes through the raised cylinder and extends into the outlet pipe.

2. A neutral-grounding transformer according to claim 1, characterized in that The A-phase lead cable passes through the A mutual inductor; the B-phase lead cable passes through the B mutual inductor; and the C-phase lead cable passes through the C mutual inductor.

3. A neutral-grounding transformer according to claim 1, characterized in that It also includes a first connecting rod and a second connecting rod; both the first connecting rod and the second connecting rod are disposed within the collinear box; the shorting rod connects the first connecting rod and the second connecting rod; the shorting rod is horizontally disposed; the shorting rod is a metal rod.

4. A neutral-grounding transformer according to claim 1, characterized in that It also includes a clamping component; the clamping component includes a first clamping plate, a second clamping plate, a threaded rod, and a knob; both the first clamping plate and the second clamping plate are located inside the outlet tube; the first clamping plate is fixedly connected to the inner wall of the outlet tube; a first threaded hole is provided through the tube wall of the outlet tube; the threaded rod is screwed into the first threaded hole; one end of the threaded rod extending into the outlet tube is rotatably connected to the second clamping plate; the knob is provided at the end of the threaded rod outside the outlet tube; the first clamping plate and the second clamping plate are used to clamp and fix the neutral point cable.

5. A neutral-point-based grounding transformer according to claim 4, characterized in that, The clamping component further includes a first slide rod and a second slide rod; both the first slide rod and the second slide rod are fixedly connected to the side of the first clamping plate facing the second clamping plate; the first slide rod and the second slide rod are parallel to each other; the second clamping plate is slidably sleeved on the first slide rod and the second slide rod; the central axis of the threaded rod is parallel to the first slide rod; the central axis of the threaded rod is perpendicular to the central axis of the lifting cylinder.

6. A neutral-grounding transformer according to claim 5, characterized in that The neutral point cable is passed between the first slide bar and the second slide bar; the side of the first clamping plate facing the second clamping plate is recessed and is provided with a rubber buffer layer; the side of the second clamping plate facing the first clamping plate is recessed and is provided with a rubber buffer layer.

7. A neutral-grounding transformer according to claim 1, characterized in that It also includes a first bolt; the bottom of the collinear box is provided with a first edge plate for abutting against the upper surface of the box cover; the first edge plate has a plurality of second threaded holes, and the box cover has a plurality of third threaded holes; the second threaded holes and the third threaded holes correspond one to one; the first bolt is used to engage with the second threaded holes and the corresponding third threaded holes to fix the collinear box to the box cover.

8. A neutral-grounding transformer according to claim 1, characterized in that The top of the collinear box has a through hole; the lifting cylinder is installed in the through hole; the lifting cylinder is vertically arranged.

9. A neutral-based grounding transformer according to claim 8, characterized in that, It also includes a second bolt; the bottom of the lifting cylinder is provided with a second edge plate for abutting against the upper surface of the collinear box; the second edge plate has a plurality of fourth threaded holes, and the top of the collinear box has a plurality of fifth threaded holes; the fourth threaded holes and the fifth threaded holes correspond one to one; the second bolt is used to engage with the fourth threaded holes and the corresponding fifth threaded holes to fix the lifting cylinder to the collinear box.

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