Transformer neutral point complete set protection device

Abstract

The invention provides a transformer neutral point complete protection device, which relates to the technical field of transformer neutral point protection and comprises a base, a current transformer and a lightning arrester are fixedly mounted at the top of the base, an insulating seat is fixedly mounted on one side, far away from the current transformer, of the top of the base, and a first insulator is obliquely arranged on one side of the insulating seat. The top of the insulating seat is provided with a second insulator. Through clamping matching of clamping tooth blocks and clamping grooves in the mounting mechanisms, stable clamping of the clamping tooth blocks to the electrode bar is achieved, clamping and fixing of the mounting mechanisms to the electrode bar are achieved, and by driving arc-shaped plates fixed to the ends of two first connecting plates to get close to each other, clamping and fixing of the two arc-shaped plates to the electrode bar are achieved; and the axes of the electrode bars arranged in the two mounting mechanisms respectively can be aligned, so that non-uniform electric field distribution, partial discharge or insulation breakdown caused by uneven axes of the electrode bars is avoided, and the safety of equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer neutral point protection, and specifically relates to a complete set of transformer neutral point protection devices. Background Art

[0002] The complete set of transformer neutral point protection devices is an important equipment for protecting the neutral point of power transformers, mainly used to prevent damage to transformers and power systems caused by problems such as overvoltage at the neutral point and grounding faults.

[0003] When installing the gap electrode rods of the existing complete set of transformer neutral point protection devices, the structural stability of the electrode rod installation is poor, and the axis centers of the electrode rods separately arranged at the tops of the current transformer and the lightning arrester cannot be aligned. The misalignment of the axis centers easily leads to uneven electric field distribution, causing partial discharge or insulation breakdown, and affecting the safety of the equipment. Summary of the Invention

[0004] (I) Technical Problems to be Solved In view of the deficiencies of the prior art, the present invention provides a complete set of transformer neutral point protection devices, which solves the problem that the axis centers of the electrode rods separately arranged at the tops of the current transformer and the lightning arrester of the existing complete set of transformer neutral point protection devices cannot be aligned.

[0005] (II) Technical Solutions To achieve the above objectives, the present invention is realized through the following technical solutions: A complete set of transformer neutral point protection devices includes a base, on the top of which a current transformer and a lightning arrester are fixedly installed. On the side of the base away from the current transformer, an insulating seat is fixedly installed. On one side of the insulating seat, a first insulator is inclined, and a second insulator is arranged on the top of the insulating seat.

[0006] Installation mechanisms are fixedly installed on the tops of the current transformer and the lightning arrester, and electrode rods are fitted on the installation mechanisms. The electrode rods are spherical electrode rods or rod-shaped electrode rods.

[0007] Preferably, the installation mechanism includes an installation base plate, on the top of which an installation frame is fixed. On the top of the installation frame, a side plate is fixed. On one side surface of the side plate, a threaded rod is rotationally fitted in a threaded manner. On the top of the installation frame, two limiting rods are also fixed.

[0008] The threaded rod is rotationally fitted in a threaded manner with a threaded plate. The upper and lower ends of the threaded plate are rotationally fitted with first rotating shafts. On the circumferences of the two first rotating shafts, first rotating plates are fixedly connected. One end of each of the two first rotating plates is rotationally fitted with a second rotating shaft. On the circumferences of the two second rotating shafts, sliding plates are fixed. The two sliding plates are slidably fitted between the two limiting rods. One end of each of the two sliding plates is fixed with an arc-shaped clamping plate, and one end of each of the two arc-shaped clamping plates is fixed with a clamping tooth block.

[0009] Two clamping grooves are formed on the circumferential side surface of the electrode rod, and the two clamping tooth blocks are respectively clamped and fitted in the two clamping grooves. A scale is arranged on the circumferential side surface of the electrode rod.

[0010] Preferably, a limiting frame plate is fixed on one side of the side plate.

[0011] A horizontal slider that is slidably matched with the limiting frame plate is fixed on one side of the threaded plate.

[0012] One end of the threaded rod is rotatably fitted with a circular plate, and an elastic spring is fixedly connected between the circular plate and the threaded plate. The elastic spring is always in a compressed state.

[0013] Preferably, four groups of vertical plates are fixed on the top of the mounting frame. The number of each group of vertical plates is two. A first connecting shaft is fixed between the two vertical plates. A first connecting plate is rotatably fitted on the circumferential side surface of the first connecting shaft. One end of the first connecting plate is fixedly connected with an arc-shaped plate.

[0014] Second connecting shafts are fixed on one side of the two first connecting plates. Second connecting plates are rotatably fitted on the circumferential side surfaces of the two second connecting shafts. Third connecting shafts are fixed at one ends of the two second connecting plates. A third connecting plate is rotatably fitted between the two second connecting shafts.

[0015] Preferably, two groups of lifting rods are fixed on the top of the mounting frame. The number of each group of lifting rods is four. Each group of lifting rods is slidably matched with the two third connecting plates up and down respectively.

[0016] Preferably, a connecting block is fixed on the top of the mounting frame. A central shaft is rotatably fitted on one side of the connecting block.

[0017] A fourth connecting plate is rotatably fitted at the bottom of the third connecting plate. A fifth connecting plate is rotatably fitted at one end of the fourth connecting plate. One end of the fifth connecting plate is fixedly connected with the central shaft.

[0018] Preferably, a driven gear is fixed on the circumferential side surface of the central shaft.

[0019] Master racks that are meshed with the driven gear are slidably fitted on the opposite outer side surfaces of the mounting frame. An L-shaped plate is fixedly connected between the master rack and the threaded plate.

[0020] An aluminum row is fixedly connected between the tops of the first insulator and the second insulator. A disconnecting switch is arranged on the top of the second insulator. A wire is connected between the top of the second insulator and the electrode rod located on the top of the lightning arrester.

[0021] (III) Beneficial effects The present invention provides a complete set of protection devices for the neutral point of a transformer. It has the following beneficial effects: 1. In the present invention, through the clamping cooperation between the clamping teeth and the clamping groove, the stable clamping of the electrode rod by the clamping teeth is realized, and the clamping and fixing of the electrode rod by the installation mechanism are achieved.

[0022] 2. In the present invention, by driving the arc-shaped plates respectively fixed at the end parts of the two first connecting plates to approach each other, the clamping and fixing of the electrode rod by the two arc-shaped plates are achieved. The arc-shaped settings of the arc-shaped plates arranged in the two installation mechanisms can align the axes of the electrode rods respectively arranged in the two installation mechanisms. The alignment of the axes of the two electrode rods ensures the uniform distribution of the electric field, avoids the uneven distribution of the electric field, partial discharge or insulation breakdown caused by the misalignment of the axes of the electrode rods, and improves the safety of the equipment.

[0023] 3. In the present invention, through the elastic spring fixedly connected between the circular plate and the threaded plate which are rotationally matched with one end of the threaded rod, and the elastic spring is always in a compressed state, a reverse acting force can always be provided between the threaded rod and the threaded plate, so that the threaded plate is always subjected to a force towards the side plate, reducing the situation that the two clamping teeth gradually separate from the electrode rod caused by the movement of the threaded plate towards the electrode rod, and improving the clamping stability of the clamping teeth on the electrode rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a complete set of protection devices for the neutral point of a transformer according to the present invention; Figure 2 is Figure 1 an enlarged schematic diagram of A in Figure 3 is an assembly schematic diagram of the electrode rod and the installation mechanism; Figure 4 is Figure 3 an enlarged schematic diagram of B in Figure 5 is a front view of the installation mechanism; Figure 6 is Figure 5 an enlarged schematic diagram of C in Figure 7 is a schematic structural diagram of the installation mechanism; Figure 8 is Figure 7 an enlarged schematic diagram of D in Figure 9 is Figure 7 an enlarged schematic diagram of E in

[0025] Among them, 1. Base; 2. Current transformer; 3. Lightning arrester; 4. Insulating seat; 5. Mounting mechanism; 6. Electrode rod; 41. First insulator; 42. Second insulator; 421. Disconnector switch; 43. Aluminum busbar; 44. Conducting wire; 501. Mounting base plate; 502. Mounting frame; 503. Side plate; 504. Threaded rod; 505. Limiting rod; 506. Threaded plate; 507. First rotating shaft; 508. First rotating plate; 509. Second rotating shaft; 510. Sliding plate; 511. Arc-shaped clamping plate; 512. Clamping tooth block; 513. Limiting frame plate; 514. Horizontal slider; 515. Circular plate; 516. Elastic spring; 517. Vertical plate; 518. First connecting shaft; 519. First connecting plate; 520. Arc-shaped plate; 521. Second connecting shaft; 522. Second connecting plate; 523. Third connecting shaft; 524. Third connecting plate; 525. Lifting rod; 527. Central axis; 528. Fourth connecting plate; 529. Fifth connecting plate; 530. Driven gear; 531. Main rack; 532. L-shaped plate; 61. Clamping groove. Specific embodiments

[0026] The following will clearly and completely describe the technical solutions in the present invention in conjunction with the accompanying drawings in the present invention. Obviously, what is described is only a part of the present invention, rather than all of it. Based on the present invention, all other innovations obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0027] As Figures 1-9 shown, the present invention provides a complete set of protection devices for the neutral point of a transformer, including a base 1. A current transformer 2 and a lightning arrester 3 are fixedly installed on the top of the base 1. An insulating seat 4 is fixedly installed on one side of the top of the base 1 away from the current transformer 2. A first insulator 41 is obliquely arranged on one side of the insulating seat 4. A second insulator 42 is arranged on the top of the insulating seat 4. Mounting mechanisms 5 are fixedly installed on the tops of both the current transformer 2 and the lightning arrester 3. An electrode rod 6 is engaged with the mounting mechanism 5. An aluminum busbar 43 is fixedly connected between the tops of the first insulator 41 and the second insulator 42. A disconnector switch 421 is arranged on the top of the second insulator 42. A conducting wire 44 is connected between the top of the second insulator 42 and the electrode rod 6 located on the top of the lightning arrester 3.

[0028] The complete set of protection devices for the neutral point of a transformer is an important equipment for protecting the neutral point of a power transformer, mainly used to prevent damage to the transformer and the power system caused by problems such as overvoltage at the neutral point and grounding faults. In the present invention, the electrode rod 6 can be a spherical electrode rod or a rod-shaped electrode rod. Different types of discharge electrode rods 6 (such as spherical and rod-shaped) have different electric field distributions and discharge characteristics: Spherical electrode: The electric field distribution is uniform, and the discharge stability is good, which is suitable for medium and low voltage systems; Rod-shaped electrode: The electric field distribution is concentrated, and the discharge sensitivity is high, which is suitable for high voltage systems. By using the arrester 3 and the gap in combination, the discharge time delay of the gap discharge and the characteristic of no discharge time delay of the metal oxide arrester 3 are utilized. Under high-frequency transient overvoltages (lightning overvoltage, switching harmonic overvoltage), the arrester 3 operates and the gap does not operate; under power frequency overvoltages (single-phase grounding overvoltage), the gap operates to achieve rapid protection. In addition, the volt-second curves of the gap and the arrester 3 should be below the insulation volt-ampere characteristic curve of the transformer to achieve insulation coordination with the transformer and protect the transformer insulation.

[0029] Before using the complete set of protection devices for the neutral point of the transformer, the two installation mechanisms 5 are respectively fixedly installed on the top of the current transformer 2 and the top of the arrester 3. It should be noted that the axes of the two installation mechanisms 5 should be aligned and the heights should also be the same. Then, the electrode rod 6 is placed between the two arc-shaped plates 520. Then, according to the magnitude of the system voltage, the position of the scale line provided on the circumferential side of the electrode rod 6 is adjusted. After adjusting the position of the electrode rod 6, the installation mechanism 5 can be adjusted to fix the electrode rod 6. The adjustment process of the installation mechanism 5 is as follows: Rotate the threaded rod 504 rotatably fitted on one side of the rotating side plate 503, so that the threaded plate 506 in threaded rotational fit with the circumferential side surface of the threaded rod 504 moves horizontally along the limiting frame plate 513 towards one side of the side plate 503. Among them, the horizontal slider 514 fixed on one side of the threaded plate 506 always slides in horizontal sliding fit with the limiting frame plate 513, driving the first rotating plates 508 rotatably fitted at the upper and lower ends of the threaded plate 506 to make a rotational movement centered on the first rotating shaft 507, so that the included angle between the two first rotating plates 508 gradually decreases, driving the sliding plates 510 rotatably fitted at one end of the two first rotating plates 508 to move closer to each other in the vertical direction along the limiting rod 505, so that the distance between the two sliding plates 510 gradually decreases, driving the arc-shaped clamping plates 511 fixed at one end of the two sliding plates 510 to gradually approach, so that the distance between the two clamping teeth 512 gradually decreases until the two clamping teeth 512 are respectively in clamping fit with the two clamping grooves 61 opened on the circumferential side surface of the electrode rod 6. Among them, the place where the clamping groove 61 is located and is clamped with the clamping tooth 512 is provided with countless triangular grooves, and the bottom of the clamping tooth 512 is provided with three triangular tooth blocks. The three triangular tooth blocks at the bottom of the clamping tooth 512 are in clamping fit with any three adjacent triangular grooves in the clamping groove 61, which can realize the stable clamping of the electrode rod 6 by the clamping tooth 512 and realize the clamping and fixing of the electrode rod 6 by the installation mechanism 5; among them, an elastic spring 516 is fixedly connected between the circular plate 515 rotatably fitted at one end of the threaded rod 504 and the threaded plate 506. The elastic spring 516 is always in a compressed state and can always provide a force in the opposite direction between the threaded rod 504 and the threaded plate 506, so that the threaded plate 506 is always subjected to a force towards the side plate 503, reducing the situation that the two clamping teeth 512 are gradually separated from the electrode rod 6 caused by the movement of the threaded plate 506 towards the electrode rod 6 and improving the clamping stability of the clamping teeth 512 on the electrode rod 6;During the horizontal movement of the threaded plate 506 towards the side plate 503, the two L-shaped plates 532 fixed to the circumferential side surface of the threaded plate 506 are simultaneously moved horizontally towards the side plate 503, causing the main rack 531 fixedly connected to the other end of the L-shaped plate to move horizontally towards the side plate 503 along the groove formed on the outer surface of the mounting bracket 502. Through the meshing cooperation between the main rack 531 and the driven gear 530, the central shaft 527 fixedly connected to the center of the driven gear 530 is driven to rotate, causing the fifth connecting plate 529 fixed to the circumferential side surface of the central shaft 527 to rotate, and the angle between the fifth connecting plate 529 and the fourth connecting plate 528 gradually decreases. This drives the third connecting plate 524 fixed to the end of the fourth connecting plate 528 to move vertically downward along a plurality of lifting rods 525. Since one end of the first connecting plate 519 is rotatably fitted to the top of the mounting bracket 502, one end of the second connecting plate 522 is rotatably fitted to the first connecting plate 519, and the other end of the second connecting plate 522 is rotatably fitted to the third connecting plate 524, the two second connecting plates 522 perform a rotational movement centered on the third connecting shaft 523, causing the angle between the two second connecting plates 522 to decrease, driving the other ends of the two first connecting plates 519 to approach each other, and the angle between the two first connecting plates 519 gradually decreases, achieving the mutual approach of the arc-shaped plates 520 respectively fixed to the ends of the two first connecting plates 519, and clamping and fixing the electrode rods 6 by the two arc-shaped plates 520. The arc-shaped settings of the arc-shaped plates 520 provided in the two mounting mechanisms 5 can align the axes of the electrode rods 6 respectively provided in the two mounting mechanisms 5. The alignment of the axes of the two electrode rods 6 ensures the uniform distribution of the electric field, avoids the uneven distribution of the electric field, partial discharge or insulation breakdown caused by the misalignment of the axes of the electrode rods 6, and improves the safety of the equipment.

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transformer neutral point protection device, characterized in that: The invention comprises a base (1), a current transformer (2) and a lightning arrester (3) being fixedly mounted on the top of the base (1), an insulating seat (4) being fixedly mounted on a side of the top of the base (1) away from the current transformer (2), a first insulator (41) being obliquely arranged on one side of the insulating seat (4), and a second insulator (42) being arranged on the top of the insulating seat (4); The tops of the current transformer (2) and the lightning arrester (3) are both fixedly mounted with mounting mechanisms (5), and the mounting mechanisms (5) are matched with electrode rods (6), and the electrode rods (6) are spherical electrode rods or rod-shaped electrode rods.

2. A transformer neutral point protection device according to claim 1, characterized in that: The mounting mechanism (5) comprises a mounting base plate (501), a mounting frame (502) is fixed on the top of the mounting base plate (501), a side plate (503) is fixed on the top of the mounting frame (502), a threaded rod (504) is rotatably engaged with a side surface of the side plate (503), and two limit rods (505) are also fixed on the top of the mounting frame (502); The threaded plate (506) is rotatably engaged with the threaded side surface of the threaded rod (504), the upper and lower ends of the threaded plate (506) are rotatably engaged with the first rotating shaft (507), the circumferential side surfaces of the two first rotating shafts (507) are fixedly connected with the first rotating plates (508), one ends of the two first rotating plates (508) are rotatably engaged with the second rotating shaft (509), the circumferential side surfaces of the two second rotating shafts (509) are fixed with sliding plates (510), the two sliding plates (510) are slidably engaged between the two limit rods (505), one end of the two sliding plates (510) is fixed with an arc-shaped clamping plate (511), and one end of the two arc-shaped clamping plates (511) is fixed with a clamping tooth block (512); Two clamping grooves (61) are provided on the side surface of the electrode rod (6), and the two clamping tooth blocks (512) are respectively clamped and fitted in the two clamping grooves (61). The side surface of the electrode rod (6) is provided with scales.

3. A transformer neutral point protection device according to claim 2, characterized in that: A limiting frame plate (513) is fixed on one side of the side plate (503); A horizontal sliding block (514) that slidably cooperates with the limiting frame plate (513) is fixed on one side of the threaded plate (506); One end of the threaded rod (504) is rotatably matched with a circular plate (515), and an elastic spring (516) is fixedly connected between the circular plate (515) and the threaded plate (506), and the elastic spring (516) is always in a compressed state.

4. A transformer neutral point protection device according to claim 3, characterized in that: Four groups of vertical plates (517) are fixed on the top of the mounting frame (502), each group of vertical plates (517) has two vertical plates (517), a first connecting shaft (518) is fixed between the two vertical plates (517), a first connecting plate (519) is rotatably engaged with a side surface of the first connecting shaft (518), and an arc-shaped plate (520) is fixedly connected to one end of the first connecting plate (519); A second connecting shaft (521) is fixed to one side of the two first connecting plates (519), a second connecting plate (522) is rotatably engaged with the side surfaces of the two second connecting shafts (521), a third connecting shaft (523) is fixed to one end of the two second connecting plates (522), and a third connecting plate (524) is rotatably engaged between the two second connecting shafts (521).

5. A transformer neutral point protection device according to claim 4, characterized in that: Two groups of lifting rods (525) are fixed on the top of the mounting frame (502), each group of the lifting rods (525) has four lifting rods (525), and each group of the lifting rods (525) is slidably matched with two third connecting plates (524) in an up-and-down manner.

6. A transformer neutral point protection device according to claim 5, characterized in that: A connection block is fixed on the top of the mounting frame (502), and a central shaft (527) is rotatably engaged on one side of the connection block; The bottom of the third connecting plate (524) is rotatably matched with a fourth connecting plate (528), one end of the fourth connecting plate (528) is rotatably matched with a fifth connecting plate (529), and one end of the fifth connecting plate (529) is fixedly connected to the central shaft (527).

7. A transformer neutral point protection device according to claim 6, characterized in that: A secondary gear (530) is fixed to the circumferential side surface of the central shaft (527); The mounting frame (502) has main racks (531) that are slidably matched with the two outer side surfaces thereof and mesh with the slave gear (530), and an L-shaped plate (532) is fixedly connected between the main rack (531) and the threaded plate (506).

8. A transformer neutral point protection device according to claim 7, characterized in that: An aluminum bar (43) is fixedly connected between the tops of the first insulator (41) and the second insulator (42), an isolating switch (421) is arranged on the top of the second insulator (42), and a wire (44) is connected between the top of the second insulator (42) and an electrode rod (6) located on the top of the arrester (3).

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