Transformer neutral point grounding protection device

Abstract

The utility model relates to a grounding protection device, in particular to a transformer neutral point grounding protection device. The device comprises an isolating switch, an insulator lightning arrester, a current transformer and a mounting base, the lower ends of the isolating switch and the insulator lightning arrester are respectively mounted on the mounting base, and the upper end of the isolating switch is mounted at the upper end of the insulator lightning arrester; the current transformer is mounted on the mounting base, and a discharge gap is arranged between a lead column at the upper end of the current transformer and the insulator lightning arrester. According to the utility model, the supporting insulator and the lightning arrester in the existing transformer neutral point grounding protection device are combined, that is, the resistor disc of the lightning arrester is arranged in the supporting insulator to form the insulator lightning arrester, and the insulator lightning arrester is directly installed with the isolating switch, so that the installation size is reduced, the occupied space is smaller, the field assembly is convenient, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a grounding protection device, in particular to a transformer neutral point grounding protection device. BACKGROUND

[0002] The transformer neutral point grounding protection device is special for the neutral point of the power transformer to realize two different operation modes of the neutral point grounding operation or non-grounding operation of the transformer, thereby avoiding the damage to the transformer caused by the voltage rise of the neutral point of the transformer due to the system failure.

[0003] As shown in Figure 1 The existing neutral point grounding protection device comprises a mounting base 06 and an isolating switch 01, a lightning arrester 02, a counting monitor 03 and a current transformer 05 which are respectively mounted on the mounting base 06. The lower end of the switch body and the lower end of the supporting insulator are respectively mounted on the mounting base 06, the upper end of the switch body is mounted on the upper end of the supporting insulator, and the upper end of the supporting insulator is connected with the upper end of the lightning arrester 02 through a wiring row. The upper end of the lightning arrester 02 and the lead column upper end of the current transformer 05 are provided with a discharge gap 04.

[0004] However, the switch body of the isolating switch 01 in the existing transformer neutral point grounding protection device needs to be connected with the lightning arrester 02 through the supporting insulator, so that a larger installation space is required, thereby resulting in a larger space occupied by the grounding protection device, which is not conducive to the on-site assembly and has a higher production cost. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the problem of the large installation size of the isolating switch in the existing neutral point grounding protection device, which not only results in a large space occupied by the overall device and is not conducive to the on-site assembly, but also has a higher production cost, and provides a transformer neutral point grounding protection device.

[0006] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that

[0007] A transformer neutral point grounding protection device, which is characterized in that:

[0008] The transformer neutral point grounding protection device comprises an isolating switch, an insulator lightning arrester, a current transformer and a mounting base.

[0009] The lower end of the isolating switch and the lower end of the insulator lightning arrester are respectively mounted on the mounting base, and the upper end of the isolating switch is mounted on the upper end of the insulator lightning arrester.

[0010] The current transformer is mounted on the mounting base, and a discharge gap is arranged between the lead column of the upper end of the current transformer and the insulator lightning arrester.

[0011] Further, the insulator arrester comprises an insulating cylinder, a resistance disc set in the insulating cylinder, and an upper flange and a lower flange respectively installed on the upper and lower ends of the insulating cylinder.

[0012] The upper end of the isolating switch is installed on the upper flange, and the lower flange is installed on the installation base through a support seat.

[0013] Further, the upper flange is installed with a first discharge part; and the upper end of the lead column is installed with a second discharge part.

[0014] One end of the first discharge part and the second discharge part is located on the same straight line, and is provided with a gap, which is a discharge gap.

[0015] Further, the first discharge part is installed on the upper flange through a gap fixing plate.

[0016] Further, the discharge part is a metal rod or a metal ball.

[0017] Further, the installation base is installed with a counting monitor; and the counting monitor is electrically connected with the lower end of the insulator arrester.

[0018] Further, the isolating switch is GW13 type, GW8 type or JW type.

[0019] The beneficial effects of the utility model are:

[0020] The utility model combines the support insulator and the arrester in the existing transformer neutral point grounding protection device, that is, the resistance disc of the arrester is installed in the support insulator to form the insulator arrester, which is directly installed with the isolating switch, reduces the installation size, occupies small space, is convenient for on-site assembly, and reduces the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view of the existing transformer neutral point grounding protection device;

[0022] Figure 2 It is a structural schematic view of the embodiment one of the utility model;

[0023] Figure 3 It is a structural schematic view of the embodiment two of the utility model;

[0024] Figure 4 It is a structural schematic view of the embodiment three of the utility model;

[0025] Figure 5 It is a structural schematic view of the embodiment four of the utility model.

[0026] In the figure: 1-disconnector, 2-insulator arrester, 3-counting monitor, 4-discharge gap, 5-current transformer, 6-mounting base, 7-first discharge piece, 8-second discharge piece, 9-gap fixing plate. DETAILED DESCRIPTION

[0027] In order to make the purpose, advantages and characteristics of the utility model more clear, the following will make further detailed description of the utility model to a transformer neutral point grounding protection device combined with the drawings and specific embodiments. According to the following specific embodiments, the advantages and characteristics of the utility model will be more clear.

[0028] Referring to Figure 2 , the embodiment of a transformer neutral point grounding protection device mainly includes disconnector 1, insulator arrester 2, counting monitor 3, current transformer 5 and mounting base 6.

[0029] The disconnector 1 in the embodiment adopts GW13 type, and the lower end is installed on one end of the upper side of the mounting base 6, and the upper end is installed on the upper end of the insulator arrester 2, and the grounding or non-grounding of the transformer neutral point can be realized through the opening and closing of the disconnector 1. Of course, referring to Figure 4 and Figure 5 , in other embodiments of the utility model, GW8 type disconnector 1 can also be used. In addition, JW type disconnector 1 can also be used.

[0030] Specifically, the insulator arrester 2 in the embodiment includes an insulating cylinder, a resistor sheet group arranged in the insulating cylinder, and an upper flange and a lower flange respectively installed on the upper and lower ends of the insulating cylinder. It can be understood that the resistor sheet group is usually composed of a plurality of resistor sheets stacked along the axis of the insulating cylinder in the field. The upper end of the disconnector 1 is installed on the upper flange, and the lower flange is installed on the mounting base 6 through the support seat, and the fixed position of the disconnector 1 and the mounting base 6 corresponds.

[0031] The upper flange is installed with the first discharge piece 7 through the gap fixing plate 9; the current transformer 5 is installed on the mounting base 6 and located at one end of the upper side of the mounting base 6 away from the disconnector 1. The upper side of the current transformer 5 is provided with a lead column, and the upper end of the lead column is provided with the second discharge piece 8; one end of the first discharge piece 7 and the second discharge piece 8 is located on the same straight line, and is provided with a gap, and the gap is the discharge gap 4.

[0032] The specific size of the foregoing discharge gap 4 is known to those skilled in the art, and needs to be set according to the actual working voltage of the transformer, therefore, in the embodiment, it is not specifically limited.

[0033] Referring to Figure 2 and Figure 4In the embodiment, the first discharge member 7 and the second discharge member 8 are metal rods, and the discharge gap 4 is a rod gap. Figure 3 and Figure 5 In other embodiments of the utility model, the first discharge member 7 and the second discharge member 8 can also be metal balls, and the discharge gap 4 is a ball gap.

[0034] The counting monitor 3 is installed on the mounting base 6 and located between the insulator arrester 2 and the current transformer 5, the counting monitor 3 is electrically connected with the lower end of the insulator arrester 2, and the leakage current and the discharge times of the insulator arrester 2 can be monitored in real time through the counting monitor 3.

Claims

1. A transformer neutral point grounding protection device, characterized in that: it comprises a disconnector (1), an insulator arrester (2), a current transformer (5) and a mounting base (6); the lower ends of the disconnector (1) and the insulator arrester (2) are respectively mounted on the mounting base (6), and the upper end of the disconnector (1) is mounted on the upper end of the insulator arrester (2); the insulator arrester (2) comprises an insulating cylinder, a resistor sheet group arranged in the insulating cylinder, and an upper flange and a lower flange respectively mounted on the upper and lower ends of the insulating cylinder; the upper end of the disconnector (1) is mounted on the upper flange, and the lower flange is mounted on the mounting base (6) through a support seat; the current transformer (5) is mounted on the mounting base (6), and a discharge gap (4) is arranged between the lead post at the upper end of the current transformer (5) and the insulator arrester (2).

2. The transformer neutral point grounding protection device according to claim 1, characterized in that: the upper flange is provided with a first discharge member (7); and the upper end of the lead post is provided with a second discharge member (8); one end of the first discharge member (7) and the second discharge member (8) is located on the same straight line, and a gap is arranged therebetween, which is the discharge gap (4).

3. The transformer neutral point grounding protection device according to claim 2, characterized in that: the first discharge member (7) is mounted on the upper flange through a gap fixing plate (9).

4. The transformer neutral point grounding protection device according to claim 3, characterized in that: the first discharge member (7) and the second discharge member (8) are metal rods or metal balls.

5. The transformer neutral point grounding protection device according to any one of claims 1-4, characterized in that: a counting monitor (3) is mounted on the mounting base (6); and the counting monitor (3) is electrically connected with the lower end of the insulator arrester (2).

6. The transformer neutral point grounding protection device according to claim 5, characterized in that: the disconnector (1) is of GW13 type, GW8 type or JW type.

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