Damp-proof terminal box structure of outdoor voltage transformer

Abstract

The utility model provides a moisture-proof terminal box structure of an outdoor voltage transformer, which comprises a terminal box protection cavity used for covering the outer side of a wiring board of the capacitor voltage transformer, a cavity end cover is arranged at the first end of the terminal box protection cavity, and a first sealing piece is arranged between the cavity end cover and the terminal box protection cavity. The second end of the terminal box protection cavity is connected with the capacitor voltage transformer oil tank shell in a sealed mode, the terminal box protection cavity is provided with a terminal wire outlet, the first end of the terminal box protection cavity is provided with an outer cover of an annular structure, and the outer cover covers the first sealing piece and the outer side of the cavity end cover; the outer cover covers the first sealing element and the outer side of the cavity end cover, so that the first sealing element is prevented from being irradiated by sunlight, the service life of the first sealing element is prolonged, and aging is delayed.

Description

TECHNICAL FIELD

[0001] The utility model relates to power equipment technical field especially relates to a kind of outdoor voltage transformer moisture-proof terminal box structure. BACKGROUND

[0002] Outdoor capacitive voltage transformer (CVT) is the key power equipment of high-voltage switch station of power system, for measuring the voltage signal of transmission line, for line relay protection and gateway metering use, it usually adopts cylindrical structure, its secondary terminal is usually directly led out from the middle transformer oil tank of CVT bottom, adopts epoxy resin and is isolated with oil, and it is also used as terminal block.Voltage transformer middle transformer oil should be damp, secondary terminal is strictly prohibited short-circuit operation, so it must guarantee the dry and good insulation of secondary terminal leading-out part (terminal block), cannot be damp, so it needs to be closed protection, moisture-proof waterproof treatment.At present, a metal cylinder is usually welded on the voltage transformer oil tank shell around secondary terminal terminal block, the lower end of the cylinder is provided with a small hole for the secondary line to exit, and a sealing strip and a metal cover plate are further bolted on the end face of the metal cylinder to form a protective cavity, thereby realizing the sealing and rain-proof and sun-proof functions of the secondary terminal, as shown in Figure 5 The prior art has the following disadvantages: first, the sealing strip is easily aged after long-time operation, the sealing effect is poor, and moisture and rainwater can easily penetrate into the protective cavity through the end face, causing the secondary terminal to be damp or even waterlogged;second, there is no monitoring and dehumidification function for the moisture in the cavity, so that the damp problem cannot be found and treated in time, affecting the safe operation of the equipment. UTILITY MODEL CONTENTS

[0003] The utility model aims at providing a kind of outdoor voltage transformer moisture-proof terminal box structure, by the outer cover of the first sealing element and the cavity end cover outside, to avoid the first sealing element is irradiated by sunlight, prolongs the service life of first sealing element, delays the aging, also can avoid the problem that rainwater is easily penetrated into the protective cavity through the mating surface of the first sealing element after the aging of the first sealing element, plays the role of shielding, reduces the probability that capacitive voltage transformer terminal block and secondary terminal are damp or even waterlogged.In order to realize the above technical features, the purpose of the utility model is realized as follows:

[0004] A kind of outdoor voltage transformer moisture-proof terminal box structure, including the terminal box protective cavity for covering on the outside of capacitive voltage transformer terminal block, the first end of the terminal box protective cavity is equipped with cavity end cover, first sealing element is arranged between the cavity end cover and the terminal box protective cavity, when working, the second end of the terminal box protective cavity is sealedly connected with the capacitive voltage transformer oil tank shell, terminal outlet is equipped on the terminal box protective cavity, the first end of the terminal box protective cavity is equipped with the outer cover of annular structure, the outer cover covers the first sealing element and the cavity end cover outside.

[0005] The cover and the terminal box protection cavity are in an integral structure.

[0006] The cavity end cover and the terminal box protection cavity are connected by welding.

[0007] The terminal outlet is arranged on the side of the terminal box protection cavity, and the terminal outlet is connected with a bend which is oriented towards the ground.

[0008] The terminal box protection cavity is provided with a transparent bottle body which is communicated with the inner cavity of the terminal box protection cavity.

[0009] The bottle body is provided with color-changing silica gel which will gradually change color after absorbing moisture.

[0010] The bottle body and the terminal box protection cavity are connected by a screw opening, and a second sealing element is arranged between the screw opening and the terminal box protection cavity.

[0011] The material of the bottle body is glass or acrylic.

[0012] The utility model has the following beneficial effects:

[0013] 1. The cover is arranged outside the first sealing element and the cavity end cover, so that the first sealing element is prevented from being irradiated by sunlight, the service life of the first sealing element is prolonged, the aging of the first sealing element is delayed, and the problem that rainwater easily penetrates into the protection cavity through the matching surface of the first sealing element after the first sealing element is aged is avoided, the shielding effect is achieved, and the probability that the capacitor voltage transformer terminal block and the secondary terminal are dampened or even waterlogged is reduced.

[0014] 2. The bottle body is arranged, so that even if the cavity sealing ring is damaged due to aging, rainwater entering the bottle body is automatically caused to flow into the bottle body, and the terminal block and the secondary terminal in the terminal box protection cavity are prevented from being soaked in water.

[0015] 3. The color-changing silica gel is arranged, when moisture enters the terminal box protection cavity, the color-changing silica gel changes color after absorbing the moisture, a patrol personnel can observe the color change of the silica gel through the bottle body to determine whether the terminal box protection cavity is damp, so that equipment defects are found early, and equipment operation safety hazards are eliminated. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further described in connection with the drawings and examples.

[0017] Figure 1 The structure of the outdoor voltage transformer moisture-proof terminal box structure provided by the utility model is shown in the structure diagram.

[0018] Figure 2An internal structure schematic view of a kind of outdoor voltage transformer moisture-proof terminal box structure provided by the utility model embodiment;

[0019] Figure 3 A sectional view of a kind of outdoor voltage transformer moisture-proof terminal box structure provided by the utility model embodiment;

[0020] Figure 4 A kind of outdoor voltage transformer moisture-proof terminal box structure provided by the utility model embodiment Figure 3 Middle A partial view;

[0021] Figure 5 The schematic diagram of the moisture-proof structure in the prior art for the utility model;

[0022] In the drawing: terminal box protection cavity 1, cavity end cover 2, first sealing element 3, terminal outlet 4, cover 5, elbow 6, bottle body 7, color-changing silica gel 8, screw port 9, second sealing element 10, bolt 11. DETAILED DESCRIPTION

[0023] The embodiment of the utility model is further explained below in combination with the drawings.

[0024] Referring to the accompanying Figures 1-4 A kind of outdoor voltage transformer moisture-proof terminal box structure, including the terminal box protection cavity 1 for covering in the outside of capacitive voltage transformer terminal block, the first end of the terminal box protection cavity 1 is equipped with cavity end cover 2, first sealing element 3 is equipped between the cavity end cover 2 and the terminal box protection cavity 1, when working, the second end of the terminal box protection cavity is sealedly connected with the capacitive voltage transformer oil tank shell, the terminal box protection cavity is equipped with terminal outlet 4, the first end of the terminal box protection cavity 1 is equipped with the cover 5 of annular structure, the cover 5 is covered in the outside of the first sealing element 3 and the cavity end cover 2.

[0025] The utility model includes terminal box protection cavity 1, when working, one end of terminal box protection cavity 1 is sealedly connected with capacitive voltage transformer oil tank shell and is covered in the outside of capacitive voltage transformer terminal block, the other end of terminal box protection cavity 1 is equipped with cavity end cover 2 and first sealing element 3, terminal lead on capacitive voltage transformer terminal block is led out from terminal outlet 4, then sealed outlet is sealed by plugging material, so that capacitive voltage transformer terminal block is in sealed state's box protection cavity 1 to reach the effect of sealing and moisture-proof;Cover 5 is covered in the outside of first sealing element 3 and cavity end cover 2, to avoid that first sealing element 3 is irradiated by sunlight, prolongs the service life of first sealing element 3, delays aging, simultaneously also can avoid the problem that, after the aging of first sealing element 3, moisture and rainwater are easily infiltrated into protection cavity through the mating surface of first sealing element 3, plays the role of shielding, reduces the probability that secondary terminal on capacitive voltage transformer terminal block is damp even waterlogged.

[0026] Further, the cover 5 and the terminal box protection cavity 1 are integrated structure, see Figure 3 , the first sealing member 3 and the cavity end cover 2 are installed in the stepped hole of the end of the terminal box protection cavity 1, without additional installation of the cover, the structure simplifies the use and installation, and is convenient for maintenance.

[0027] Further, the cavity end cover 2 and the terminal box protection cavity 1 are connected by welding, thereby simultaneously playing the reliable connection and sealing of both.

[0028] Further, the terminal outlet 4 is arranged on the side of the terminal box protection cavity 1, and the terminal outlet 4 is connected with the elbow 6 which is open to the ground, so that the terminal lead wire is arranged downward after being led out of the terminal box protection cavity 1, and the lateral arrangement is convenient for sealing the outlet of the elbow 6 by the sealing material, and prevents the inflow of rainwater.

[0029] Further, the bottom of the terminal box protection cavity 1 is provided with a transparent bottle body 7, which is communicated with the inner cavity of the terminal box protection cavity 1, and even if rainwater enters after the aging damage of the cavity sealing ring 3, it will automatically flow into the bottle body 7, preventing the terminal box protection cavity 1 from being soaked in water.

[0030] Further, the bottle body 7 is placed with color-changing silica gel 8, when the terminal box protection cavity 1 has moisture, the color-changing silica gel 8 changes color after absorbing the moisture, and the inspection personnel can observe the color change of the silica gel through the bottle body to determine whether the terminal box protection cavity 1 is damp, thereby discovering the equipment defects early and eliminating the safety hazards of equipment operation.

[0031] Further, the bottle body 7 and the terminal box protection cavity 1 are connected through the screw port 9, and the second sealing member 10 is arranged between the screw port and the terminal box protection cavity, so as to install and dismount the bottle body 7, and realize the sealed connection.

[0032] Further, the material of the bottle body 7 is glass or acrylic.

Claims

1. An outdoor voltage transformer moisture-proof terminal box structure, comprising a terminal box protection cavity for covering the outside of a capacitive voltage transformer terminal block, a cavity end cover is installed at the first end of the terminal box protection cavity, a first sealing element is arranged between the cavity end cover and the terminal box protection cavity, in operation, the second end of the terminal box protection cavity is sealingly connected with the oil tank shell of the capacitive voltage transformer, and a terminal outlet port is arranged on the terminal box protection cavity, characterized in that: The first end of the terminal box protection cavity is provided with an annular structure cover, which covers the outside of the first sealing element and the cavity end cover. ​ 2. The outdoor voltage transformer moisture-proof terminal box structure according to claim 1, characterized in that: The cover and the terminal box protection cavity are in an integral structure.

3. The outdoor voltage transformer moisture-proof terminal box structure according to claim 1, characterized in that: The cavity end cover and the terminal box protection cavity are connected by welding.

4. The outdoor voltage transformer moisture-proof terminal box structure according to claim 1, characterized in that: The terminal outlet is arranged on the side of the terminal box protection cavity, and the terminal outlet is connected with a elbow which is directed to the ground.

5. The outdoor voltage transformer moisture-proof terminal box structure according to claim 1, characterized in that: The bottom of the terminal box protection cavity is provided with a transparent bottle body which is communicated with the inner cavity of the terminal box protection cavity.

6. The outdoor voltage transformer moisture-proof terminal box structure according to claim 5, characterized in that: The bottle body is placed with color-changing silica gel which will gradually change color after absorbing moisture.

7. The outdoor voltage transformer moisture-proof terminal box structure according to claim 5, characterized in that: The bottle body and the terminal box protection cavity are connected by a screw port, and a second sealing element is arranged between the screw port and the terminal box protection cavity.

8. The outdoor voltage transformer moisture-proof terminal box structure according to claim 5, characterized in that: The material of the bottle body is glass or acrylic.

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