Compact ring main unit based on electronic voltage transformer

Abstract

The utility model discloses a compact ring main unit based on an electronic voltage transformer, which comprises a gas tank and an electronic voltage sensor, and further comprises a through-wall connecting sleeve arranged on a bottom plate of a tank body of the gas tank, the lower end of a second pipe body of the through-wall connecting sleeve is conical, a second conductive rod is arranged in the second pipe body, and the second conductive rod is arranged in the gas tank. The upper end of the second conductive rod is connected with the inner end of the first conductive rod through a connecting cable; the compact ring main unit further comprises a connecting plug and a double-thread screw. The upper end of the double-thread screw is matched with a threaded hole in the lower end of the second conductive rod, and the lower end of the double-thread screw is matched with a threaded hole in the upper end of the electronic voltage sensor. According to the utility model, the detachable electric connection between the outer side electronic voltage sensor and the incoming and outgoing line connecting sleeve is realized through the double-thread screw and the wall-through connecting sleeve, and the device also has the advantages of convenient operation, good safety and the like.

Description

Technical Field

[0001] The utility model belongs to the field of power distribution, and in particular relates to a ring network cabinet device. Background Art

[0002] Ring main unit is one of the most widely used electrical equipment in power systems, and is widely used in power generation systems, distribution systems, and power supply terminals. There are two main types of voltage sensors in ring main units: electromagnetic and electronic. Electromagnetic devices are large in size, which is not conducive to the miniaturization of the cabinet. Electronic devices are easy to miniaturize and are gradually replacing electromagnetic devices in compact scenarios.

[0003] At present, there are two ways to install the connection components of electronic voltage sensors: one is to design the electronic voltage sensor and the inlet and outlet bushings as one, and install it on the gas box of the ring main unit. The disadvantage is that once the electronic voltage sensor is damaged, it is difficult to replace, which may cause the entire ring main unit to be scrapped. The other is to install the electronic voltage sensor at the rear end of the cable plug. The disadvantage is that it needs to be installed on site, and the voltage sensor cannot be tested in the factory, especially the test of parameters such as accuracy and partial discharge. Utility Model Content

[0004] The utility model provides a compact ring network cabinet based on an electronic voltage transformer, which aims to solve the problems of difficulty in replacing an integrated structure and inability to perform tests in a factory due to installation at the rear end of a cable plug.

[0005] The technical solution of this utility model is as follows:

[0006] A compact ring main unit based on an electronic voltage transformer comprises a gas box and an electronic voltage sensor, wherein an inlet and outlet connection bushing is installed on the gas box, a first conductive rod is arranged in a first tube body of the inlet and outlet connection bushing, and an inner end of the first conductive rod is connected to a branch busbar in the gas box, and the compact ring main unit further comprises a through-wall connection bushing installed on a bottom plate of the gas box, a second tube body of the through-wall connection bushing has a conical lower end and is located outside the gas box, a second conductive rod is arranged in the second tube body, and an upper end of the second conductive rod is connected to the inner end of the first conductive rod through a connecting cable;

[0007] The compact ring main unit further comprises a connecting plug and a double-headed screw; the connecting plug is cylindrical, and its inner hole comprises an upper and a lower part, the upper part is a first tapered hole whose inner diameter gradually decreases from top to bottom, and the lower part is a second tapered hole whose inner diameter gradually increases from top to bottom, the first tapered hole is used to match with the lower end of the second tube body, and the second tapered hole is used to match with the tapered surface of the upper end of the electronic voltage sensor;

[0008] The double-headed screw is located in the inner hole of the connecting plug, the upper end of which matches with the threaded hole at the lower end of the second conductive rod, and the lower end of which matches with the threaded hole at the upper end of the electronic voltage sensor.

[0009] As a further improvement of the compact ring main unit based on the electronic voltage transformer: the inner end of the first tube body is also provided with two left and right insulating side plates and an insulating flat plate connected between the bottom ends of the two insulating side plates.

[0010] As a further improvement of the compact ring main unit based on electronic voltage transformer: the upper end of the second tube body is also provided with an insulating arc plate located at the rear side of the upper end of the second conductive rod and opening forward, and an insulating extension plate extending forward and located below the insulating flat plate.

[0011] As a further improvement of the compact ring main unit based on the electronic voltage transformer: a groove recessed toward the rear is provided at the bottom of the front wall of the gas box, and the groove is composed of an eaves plate and a vertical plate whose upper end is connected to the rear end of the eaves plate;

[0012] The inlet and outlet line connection sleeves are installed on the vertical plate.

[0013] As a further improvement of the compact ring main unit based on electronic voltage transformer: the inner surfaces of the first conical hole and the second conical hole are provided with a soft layer.

[0014] As a further improvement of the compact ring main unit based on the electronic voltage transformer: the outer end of the first tube body is conical.

[0015] Compared with the prior art, the utility model has the following positive effects:

[0016] 1. The utility model realizes the detachable electrical connection between the outer electronic voltage sensor and the inlet and outlet line connection sleeve through the double-headed screw and the wall-penetrating connection sleeve, which is convenient for replacing the voltage sensor and does not need to be connected to the cable plug, so it can be installed and tested in the factory.

[0017] 2. The connecting plug adopts a double-conical hole structure, which is tightly connected with the lower end of the wall-penetrating connecting sleeve and the upper end of the electronic voltage sensor, with good sealing and easy operation.

[0018] 3. The upper end of the wall-penetrating connection sleeve adopts an insulating arc plate structure, which can reduce the space occupied. The insulating extension plate cooperates with the insulating side plate and the insulating flat plate above to ensure the continuity and integrity of the insulation shielding and improve the electrical safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the appearance diagram of the utility model;

[0020] Figure 2It is a partial cross-sectional view of the utility model. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments.

[0022] like Figure 1 and 2 A compact ring main unit based on an electronic voltage transformer comprises a gas box 1 formed by welding steel plates.

[0023] Three groups of horizontally arranged inlet and outlet connection sleeves 2 are installed on the front wall plate of the gas box 1. A first conductive rod 2-2 is arranged in the first tube body 2-1 of the inlet and outlet connection sleeve 2, and the inner end of the first conductive rod 2-2 is connected to the branch bus in the gas box 1.

[0024] Furthermore, a groove recessed toward the rear is provided at the bottom of the front wall of the air box 1, and the groove is formed by the eaves board 1-1 and the vertical board 1-2 whose upper end is connected to the rear end of the eaves board 1-1. The inlet and outlet connection sleeves 2 are installed on the vertical board 1-2, and a sealing ring is provided at the contact point between the first tube body 2-1 and the inner side of the vertical board 1-2. At the same time, a first mounting plate 3 is provided on the outer side of the vertical board 1-2. The three groups of inlet and outlet connection sleeves 2 share one first mounting plate 3, and the first tube body 2-1 is installed on the vertical board 1-2 by screws passing through the first mounting plate 3 and the vertical board 1-2.

[0025] The outer end of the first tube 2 - 1 is tapered and is used to connect to an outer cable plug.

[0026] The compact ring main unit further comprises a wall-penetrating connection sleeve 5 , a connecting plug 6 , a double-headed screw 9 and an electronic voltage sensor 7 corresponding one-to-one to the three groups of incoming and outgoing line connection sleeves 2 .

[0027] The through-wall connection sleeve 5 includes a second tube body 5-1 and a second conductive rod 5-2 located in the second tube body 5-1. The second tube body 5-1 is mounted on the box bottom plate 1-3 of the gas box 1 by means of screws and the second mounting plate 4. A sealing ring is provided at the contact portion between the second tube body 5-1 and the top surface of the box bottom plate 1-3. The lower end of the second tube body 5-1 is conical and located outside the gas box 1. The upper end of the second conductive rod 5-2 is connected to the inner end of the first conductive rod 2-2 by means of a connecting cable 8.

[0028] The coupling plug 6 is cylindrical, and its inner hole includes two parts, the upper part is a first tapered hole whose inner diameter gradually decreases from top to bottom, and the lower part is a second tapered hole whose inner diameter gradually increases from top to bottom. The first tapered hole is used to match with the lower end of the second tube body 5-1, and the second tapered hole is used to match with the conical surface of the upper end of the electronic voltage sensor 7. The double-headed screw 9 is located in the inner hole of the coupling plug 6, and the upper end matches with the threaded hole at the lower end of the second conductive rod 5-2, and the lower end matches with the threaded hole at the upper end of the electronic voltage sensor 7.

[0029] Furthermore, the inner surfaces of the first tapered hole and the second tapered hole are provided with a soft rubber layer for improving the sealing performance and preventing loosening.

[0030] Furthermore, the inner end of the first tube body 2-1 is also provided with two left and right insulating side plates 2-3 and an insulating flat plate 2-4 connected between the bottom ends of the two insulating side plates 2-3, forming a U-shaped insulating shielding body. At the same time, the upper end of the second tube body 5-1 is also provided with an insulating arc plate 5-4 located at the rear side of the upper end of the second conductive rod 5-2 and opening forward, and an insulating extension plate 5-3 extending forward and located below the insulating flat plate 2-4. The insulating extension plate 5-3 and the insulating flat plate 2-4 shield each other to achieve continuous insulating shielding.

[0031] After the air box 1 and its components are installed, weld the back plate of the air box 1 to form a closed box. When installing the electronic voltage sensor 7, first ensure that the upper end of the double-headed screw 9 is connected to the lower end of the second tube 5-1, then insert the sensor into the connecting plug 6 from below and rotate it so that the threaded hole at the upper end matches the lower end of the double-headed screw 9. During the rotation, the lower end of the second tube 5-1 and the upper end of the sensor gradually press the two tapered holes from both sides, and finally achieve a tight fit connection. When the electronic voltage sensor 7 needs to be replaced, rotate the sensor in the opposite direction to disconnect it from the double-headed screw 9.

[0032] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. The scope of the present invention is defined by the claims rather than the above description.

Claims

1. A compact ring main unit based on an electronic voltage transformer, comprising a gas box (1) and an electronic voltage sensor (7), wherein an inlet and outlet connection bushing (2) is installed on the gas box (1), a first conductive rod (2-2) is arranged in a first tube body (2-1) of the inlet and outlet connection bushing (2), and an inner end of the first conductive rod (2-2) is connected to a branch bus in the gas box (1), characterized in that: The compact ring main unit also includes a wall-penetrating connection sleeve (5) installed on the bottom plate (1-3) of the gas box (1), the lower end of the second tube body (5-1) of the wall-penetrating connection sleeve (5) being conical and located outside the gas box (1), a second conductive rod (5-2) being arranged inside the second tube body (5-1), and the upper end of the second conductive rod (5-2) being connected to the inner end of the first conductive rod (2-2) via a connecting cable (8); The compact ring main unit further comprises a connecting plug (6) and a double-headed screw (9); the connecting plug (6) is cylindrical, and its inner hole comprises an upper and lower part, the upper part is a first tapered hole whose inner diameter gradually decreases from top to bottom, and the lower part is a second tapered hole whose inner diameter gradually increases from top to bottom, the first tapered hole is used to match with the lower end of the second tube body (5-1), and the second tapered hole is used to match with the tapered surface of the upper end of the electronic voltage sensor (7); The double-headed screw (9) is located in the inner hole of the connecting plug (6), the upper end of which matches the threaded hole at the lower end of the second conductive rod (5-2), and the lower end of which matches the threaded hole at the upper end of the electronic voltage sensor (7).

2. The compact ring main unit based on electronic voltage transformer according to claim 1, characterized in that: The inner end of the first tube body (2-1) is also provided with two left and right insulating side plates (2-3) and an insulating flat plate (2-4) connected between the bottom ends of the two insulating side plates (2-3).

3. The compact ring main unit based on electronic voltage transformer according to claim 2, characterized in that: The upper end of the second tube body (5-1) is also provided with an insulating arc plate (5-4) located at the rear side of the upper end of the second conductive rod (5-2) and opening forward, and an insulating extension plate (5-3) extending forward and located below the insulating flat plate (2-4).

4. The compact ring main unit based on electronic voltage transformer according to claim 1, characterized in that: The bottom of the front wall of the air box (1) is provided with a groove recessed toward the rear, the groove being composed of a cornice (1-1) and a vertical plate (1-2) whose upper end is connected to the rear end of the cornice (1-1); The inlet and outlet line connection sleeves (2) are mounted on the vertical plate (1-2).

5. The compact ring main unit based on electronic voltage transformer according to claim 1, characterized in that: The inner surfaces of the first tapered hole and the second tapered hole are provided with a soft layer.

6. The compact ring main unit based on electronic voltage transformer according to any one of claims 1 to 5, characterized in that: The outer end of the first tube (2-1) is tapered.

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