Capacitive voltage transformer terminal box structure

Abstract

The utility model belongs to the technical field of capacitance type voltage transformers, and relates to a capacitance type voltage transformer terminal box structure which comprises a terminal box body welded on an electromagnetic unit, a leading-out terminal board is arranged in the terminal box body, and an internal lead of the electromagnetic unit is connected out through the leading-out terminal board and then is connected with the terminal box body. The connector bar is fixedly connected into the terminal box body; a first cable clamping sleeve is arranged at the bottom of the terminal box body, and a terminal cable for measurement and protection is connected to a connector bar through the first cable clamping sleeve when the terminal box is used; and a terminal box flange constructed at the opening end of the terminal box body adopts a U-shaped flanging structure. According to the terminal box structure, metering terminals and measuring and monitoring terminals are separately arranged, and an independent metering terminal box is additionally arranged; the phenomenon of messy wiring of the secondary winding is improved, so that the wiring of the capacitor voltage transformer is more convenient and accurate; the sealing structure of the terminal box is optimized, the terminal box has better waterproof, high-humidity-proof and dustproof effects, and the use reliability of the terminal box is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of capacitor voltage transformers and relates to a capacitor voltage transformer terminal box structure. Background Art

[0002] Capacitor Voltage Transformer (CVT) is widely used in power grids with voltage levels of 35kV and above. It is an electrical device used for voltage measurement, energy metering, relay protection, and also as a power line carrier capacitor. CVT is mainly composed of a capacitive voltage divider and an electromagnetic unit. It converts the primary high voltage into a secondary low voltage signal that is easy to measure. The secondary winding low voltage signal terminal is integrated in the terminal box. The terminal box is connected as a secondary winding line terminal. In order to ensure the stability of the voltage signal, it needs to operate in a dry environment. The internal environment of the terminal box plays an important role in the safe and stable operation of the substation.

[0003] Existing technology: 1. The secondary winding of the electromagnetic unit has multiple sets of taps, and the metering, measurement and monitoring functions of the product's electric energy are realized through the converted low-voltage signal. All secondary winding terminals are connected to a terminal block. Since there are many secondary terminals, the wiring is relatively cumbersome and complicated, and there is a risk of wrong wiring, which is not conducive to the safe operation of the product.

[0004] 2. CVT products are installed outdoors and are directly exposed to the air. The cables need to be introduced into the terminal box, so they are often not completely sealed. Moisture or condensation easily enters the terminal box, causing the secondary cables to become damp and the insulation to decrease, affecting the normal operation of the product. Summary of the invention

[0005] In view of the above problems, the utility model provides a terminal box structure for a capacitor voltage transformer, which separates the metering terminal from the measuring and monitoring terminals; improves the phenomenon of messy secondary winding wiring, making the capacitor voltage transformer wiring more convenient and accurate; optimizes the sealing structure of the terminal box, has better waterproof, high humidity and dustproof effects, and improves the reliability of the terminal box.

[0006] According to the technical solution of the utility model: a capacitor voltage transformer terminal box structure includes a terminal box body welded on an electromagnetic unit, characterized in that: the terminal box body has a built-in lead-out terminal board, and the internal lead of the electromagnetic unit is connected to a fixed terminal block in the terminal box body after being connected through the lead-out terminal board;

[0007] A first cable clamp is installed at the bottom of the terminal box body. When in use, the terminal cables for measurement and protection are connected to the terminal block through the first cable clamp;

[0008] The terminal box flange at the open end of the terminal box body adopts a U-shaped flanging structure, and a box cover is rotatably connected to the open end of the terminal box body, and a box cover sealing ring is installed on the edge of the box cover to achieve sealing between the terminal box body and the terminal box body;

[0009] The side of the terminal box body is sealed and connected to the metering terminal box, a metering-grade terminal block is installed in the metering terminal box, and a second cable ferrule is installed at the bottom of the metering terminal box. When in use, the metering terminal cable is connected to the metering-grade terminal block through the second cable ferrule;

[0010] The metering terminal box flange at the open end of the metering terminal box adopts a U-shaped flanging structure, and is rotatably connected to the metering terminal box cover at the open end of the metering terminal box. A metering terminal box cover sealing ring is installed on the edge of the metering terminal box cover to achieve sealing between the metering terminal box and the metering terminal box.

[0011] As a further improvement of the utility model, the lead terminal plate adopts an epoxy cast plate.

[0012] As a further improvement of the utility model, a first wiring board fixing angle steel is fixed to the inner wall of the terminal box body, and the wiring row is fixed to the first wiring board fixing angle steel by bolts.

[0013] As a further improvement of the present invention, the terminal box body and the metering terminal box are fixedly connected by bolts, and a metering terminal box sealing ring is arranged between the terminal box body and the metering terminal box.

[0014] As a further improvement of the utility model, a second wiring platform fixing angle steel is fixed to the inner wall of the metering terminal box, and the metering-grade wiring row is fixed to the second wiring platform fixing angle steel by bolts.

[0015] As a further improvement of the present invention, the terminal box body is provided with a first lock to achieve locking and opening of the box cover.

[0016] As a further improvement of the utility model, the metering terminal box is equipped with a second lock to achieve locking and opening of the metering terminal box cover.

[0017] The technical effects of the utility model are: ① the newly added independent metering-grade terminal box makes wiring more convenient and accurate; ② the terminal box flange adopts a U-shaped flanging structure design, which is more waterproof; a sealing ring is added to the terminal box cover to increase the sealing performance; ③ the cable port is equipped with a special cable clamp, which can be shrunk according to the size of the cable and has better sealing performance; ④ the secondary lead-out terminal board adopts an epoxy cast board, which does not absorb moisture and has high insulation resistance; ⑤ the terminal box has a simple and reliable structure and is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0020] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.

[0021] Figure 1 , 2 The invention comprises a capacitor voltage divider 1, an electromagnetic unit 2, a terminal box body 3, a first cable ferrule 4, a metering terminal box 5, a second cable ferrule 6, a lead terminal board 7, a first terminal block fixing angle steel 8, a terminal block 9, a terminal box flange 10, a box cover sealing ring 11, a box cover 12, a metering terminal box sealing ring 13, a second terminal block fixing angle steel 14, a metering-grade terminal block 15, a metering terminal box cover sealing ring 16, a metering terminal box cover 17, a metering terminal box flange 18, a first lock buckle 19, etc.

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] like Figure 1 , 2 As shown, the utility model is a capacitive voltage transformer terminal box structure, including a terminal box body 3 welded on an electromagnetic unit 2, the terminal box body 3 has a built-in lead-out terminal board 7, the internal leads of the electromagnetic unit 2 are connected to the terminal row 9 fixed in the terminal box body 3 after being connected through the lead-out terminal board 7, and a capacitive voltage divider 1 is installed on the electromagnetic unit 2.

[0025] The bottom of the terminal box body 3 is provided with a first cable clamp 4. When in use, the terminal cables for measurement and protection are connected to the wiring block 9 through the first cable clamp 4. The tightness of the first cable clamp 4 is adjusted according to the specification of the user's incoming cable.

[0026] The terminal box flange 10 at the open end of the terminal box body 3 adopts a U-shaped flange structure, and the box cover 12 is rotatably connected at the open end of the terminal box body 3. The box cover sealing ring 11 is installed on the edge of the box cover 12 to achieve sealing with the terminal box body 3. The terminal box body 3 is equipped with a first lock buckle 19 to achieve locking and opening of the box cover 12. The sealing of the terminal box 3 is effectively guaranteed, and has better waterproof, high humidity and dustproof effects.

[0027] The side of the terminal box body 3 is sealed and connected to the metering terminal box 5, a metering-grade terminal block 15 is installed in the metering terminal box 5, and a second cable ferrule 6 is installed at the bottom of the metering terminal box 5. When in use, the metering terminal cable is connected to the metering-grade terminal block 15 through the second cable ferrule 6.

[0028] The metering terminal box flange 18 at the open end of the metering terminal box 5 adopts a U-shaped flanging structure, and is rotatably connected to the metering terminal box cover 17 at the open end of the metering terminal box 5. The metering terminal box cover sealing ring 16 is installed on the edge of the metering terminal box cover 17 to achieve sealing with the metering terminal box 5.

[0029] The lead-out terminal board 7 is made of epoxy casting board, which does not absorb moisture and has high insulation resistance.

[0030] A first wiring platform fixing angle steel 8 is fixed to the inner wall of the terminal box body 3 , and the wiring row 9 is fixed to the first wiring platform fixing angle steel 8 by bolts.

[0031] The terminal box body 3 and the metering terminal box 5 are fixedly connected by bolts, and a metering terminal box sealing ring 13 is arranged between the terminal box body 3 and the metering terminal box 5 .

[0032] A second wiring platform fixing angle steel 14 is fixed to the inner wall of the metering terminal box 5 , and a metering-level wiring row 15 is fixed to the second wiring platform fixing angle steel 14 by bolts.

[0033] The metering terminal box 5 is equipped with a second lock to realize the locking and opening of the metering terminal box cover 17, effectively ensuring the sealing of the metering terminal box 3, and having better waterproof, high humidity and dustproof effects.

[0034] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A capacitor voltage transformer terminal box structure, comprising a terminal box body (3) welded to an electromagnetic unit (2), characterized in that: The terminal box body (3) has a built-in lead-out terminal board (7), and the internal lead wires of the electromagnetic unit (2) are connected to a wiring block (9) fixed inside the terminal box body (3) after being connected through the lead-out terminal board (7); A first cable clamp (4) is installed at the bottom of the terminal box body (3); when in use, the terminal cables for measurement and protection are connected to the terminal block (9) through the first cable clamp (4); The terminal box flange (10) at the open end of the terminal box body (3) adopts a U-shaped flanging structure, and a box cover (12) is rotatably connected to the open end of the terminal box body (3), and a box cover sealing ring (11) is installed on the edge of the box cover (12) to achieve sealing between the box cover and the terminal box body (3); The side of the terminal box body (3) is sealed and connected to the metering terminal box (5), a metering-grade terminal block (15) is installed in the metering terminal box (5), and a second cable ferrule (6) is installed at the bottom of the metering terminal box (5). When in use, the metering terminal cable is connected to the metering-grade terminal block (15) through the second cable ferrule (6); The metering terminal box flange (18) constructed at the open end of the metering terminal box (5) adopts a U-shaped flange structure, and is rotatably connected to the metering terminal box cover (17) at the open end of the metering terminal box (5), and a metering terminal box cover sealing ring (16) is installed on the edge of the metering terminal box cover (17) to achieve sealing between the metering terminal box (5) and the metering terminal box cover.

2. The capacitor voltage transformer terminal box structure according to claim 1, characterized in that: The lead-out terminal plate (7) is an epoxy cast plate.

3. The capacitor voltage transformer terminal box structure according to claim 1, characterized in that: A first wiring platform fixing angle steel (8) is fixed to the inner wall of the terminal box body (3), and the wiring row (9) is fixed to the first wiring platform fixing angle steel (8) by means of bolts.

4. The capacitor voltage transformer terminal box structure according to claim 1, characterized in that: The terminal box body (3) and the metering terminal box (5) are fixedly connected by bolts, and a metering terminal box sealing ring (13) is provided between the terminal box body (3) and the metering terminal box (5).

5. The capacitor voltage transformer terminal box structure according to claim 1, characterized in that: A second wiring platform fixing angle steel (14) is fixed to the inner wall of the metering terminal box (5), and a metering-grade wiring row (15) is fixed to the second wiring platform fixing angle steel (14) by means of bolts.

6. The capacitor voltage transformer terminal box structure according to claim 1, characterized in that: The terminal box body (3) is provided with a first lock buckle (19) to achieve locking and opening of the box cover (12).

7. The capacitor voltage transformer terminal box structure according to claim 1, characterized in that: The metering terminal box (5) is equipped with a second lock to achieve locking and opening of the metering terminal box cover (17).

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