Non-standard indoor fixed busbar type current transformer and mounting structure thereof

Abstract

The utility model relates to a low-voltage measurement and protection device of an electric power system, in particular to a non-standard indoor fixed busbar type current transformer and an installation structure thereof. The non-standard indoor fixed busbar type current transformer comprises a coil device body, a transformer shell and an insulator, the transformer shell is of a square structure formed by splicing epoxy glass fiber boards, a primary bus port is formed in the center of the transformer shell, and the coil device body is contained in the transformer shell and is insulated and fixed through the insulator; and the insulator adopts epoxy resin to cast the coil device body and the mutual inductor shell into an integrated structure. The tire opening cost is saved, and the production period is shortened; and the integral structure is formed by pouring epoxy resin, so that the product is not influenced by the temperature of the environment, has higher mechanical strength, temperature resistance and aging resistance, and is longer in service life.

Description

Technical Field

[0001] The utility model relates to a low-voltage measuring and protecting device for an electric power system, in particular to a non-standard indoor fixed busbar type current transformer and a mounting structure thereof. Background Art

[0002] As a device for current measurement and relay protection, non-standard indoor fixed busbar current transformers have very strict technical requirements as the national power plant construction and development needs and the continuous improvement of installed capacity. However, there are many problems with the old-style transformer outlet current transformers, which are mainly manifested in the following aspects: First, the product is large in size and mainly uses conventional transformers in the power system. The primary busbar outlet and the transformer outlet cannot be reasonably matched, resulting in a lot of material waste; Second, the mechanical strength is low, and the insulation form is mainly plastic shell, which is often broken during installation and use, and requires special protection; Third, the aging resistance is poor and the service life is short. Affected by the high ambient temperature during normal operation, the main materials of the product age prematurely, which greatly reduces the service life of the product; Fourth, the ability to resist mechanical vibration and impact is poor. Due to the vibration of the normal operation of the matching transformer or the vibration of the operating environment, the fixing method of the product cannot fully meet the use needs, and the fixing looseness phenomenon often occurs, requiring maintenance personnel to maintain it frequently. 5. Customers have strict requirements on product size and diverse installation methods. The above problems are the main difficulties that bother customers and hidden dangers to the safe operation of complete sets of equipment. The design of non-standard indoor fixed busbar current transformers must be innovated and updated. Utility Model Content

[0003] In view of the above problems, the purpose of the utility model is to provide a non-standard indoor fixed busbar current transformer and its installation structure, so as to solve the problem that the molded case current transformer cannot meet the high temperature environment, and the standard resin cast current transformer is too large in size, resulting in excessive phase spacing, making the busbar larger, increasing the amount of copper used or making it impossible to install at all.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] On the one hand, the utility model provides a non-standard indoor fixed busbar current transformer, including a coil body, a transformer shell and an insulator, wherein the transformer shell adopts a square structure spliced ​​by epoxy glass fiber boards, and has a square structure with a primary busbar opening in the center, the coil body is accommodated in the transformer shell, and is insulated and fixed by an insulator.

[0006] The insulator is an integrated structure formed by casting the coil body and the transformer housing with epoxy resin.

[0007] A nameplate is provided on the front of the current transformer. The nameplate adopts a laser etching mode and is cast into one piece with the current transformer.

[0008] The coil body comprises an iron core and a secondary winding wound on the iron core. The secondary terminal of the secondary winding is led out from the insulator to the front of the transformer housing. The outer cover of the secondary terminal is provided with a secondary wiring cover and fixed by a lead sealing nail.

[0009] The primary busbar opening is a rectangular hole.

[0010] On the other hand, the utility model provides an installation structure of the non-standard indoor fixed busbar type current transformer as described above, comprising a transformer body, a fixing bar, a busbar and a plurality of fixing components, wherein fixing bars are embedded on opposite sides of the inner wall of the transformer body, the busbar is inserted into the primary busbar opening of the transformer body, and the two ends of the busbar are connected to the fixing bars on both sides through a plurality of fixing components.

[0011] The fixing assembly includes a top row of bolts and a pressure plate, wherein the pressure plate is fixed on the busbar, and the top row of bolts passes through the fixing strip and the ends are threadedly connected to the pressure plate, thereby tightening on both sides of the busbar.

[0012] The busbar is arranged horizontally or vertically in the primary busbar opening, and the fixing bars are located on both sides of the busbar and are parallel to the busbar.

[0013] The fixing assembly includes a through-row bolt and a mounting nut, wherein the through-row bolt passes through a fixing bar and a busbar on one side in sequence, and an end portion is threadedly connected to a fixing bar on the other side, and a plurality of mounting nuts for locking the busbar and the fixing bar are threadedly connected to the through-row bolt.

[0014] The advantages and beneficial effects of the utility model are: the utility model provides a non-standard indoor fixed busbar current transformer, the shell of which is processed and spliced ​​with epoxy glass fiber boards, and then cast with epoxy resin to form an integrated structure. The product size is customized according to the user's requirements for the product appearance. The primary busbar hole of the product is a rectangular hole to achieve docking with the busbar in the cabinet.

[0015] The utility model saves tire opening costs, reduces production cycle, has high mechanical strength, is resistant to aging, and has a long service life; the integral structure is cast with epoxy resin, the product is not affected by the ambient temperature, has high mechanical strength and heat and aging resistance, and has a longer service life.

[0016] The utility model is resistant to vibration and impact and is easy to install: because the busbar fixing bolts are fastened to the primary busbar, the product has good vibration and impact resistance performance, and can be installed in a suitable position, ensuring that the product can be installed quickly and conveniently on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a non-standard indoor fixed busbar current transformer of the utility model;

[0018] Figure 2 for Figure 1 AA section view;

[0019] Figure 3 It is a schematic diagram of the horizontal row and top row installation structure of a non-standard indoor fixed busbar type current transformer of the utility model;

[0020] Figure 4 for Figure 3 Side view of

[0021] Figure 5 This is a schematic diagram of a vertical top row installation structure of a non-standard indoor fixed busbar current transformer of the utility model;

[0022] Figure 6 for Figure 5 A top view of

[0023] Figure 7 This is a schematic diagram of the busbar installation structure of a non-standard indoor fixed busbar current transformer of the utility model;

[0024] Figure 8 for Figure 7 Side view of.

[0025] In the figure: 1- iron core, 2- secondary winding, 3- secondary terminal, 4- secondary terminal cover, 5- lead sealing nail, 6- nameplate, 7- transformer housing, 8- insulator, 9- primary busbar port, 10- transformer body, 11- top row of bolts, 12- fixing bar, 13- pressure plate, 14- busbar, 15- through row bolts, 16- mounting nuts. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 , Figure 2 As shown, on the one hand, the utility model provides a non-standard indoor fixed busbar current transformer, including a coil body, a transformer shell 7 and an insulator 8, wherein the transformer shell 7 adopts a square structure spliced ​​by epoxy glass fiber boards, and has a primary busbar opening 9 in the center. The coil body is accommodated in the transformer shell 7 and is insulated and fixed by the insulator 8.

[0028] Specifically, the primary busbar opening 9 is a rectangular hole.

[0029] In an embodiment of the utility model, the coil body includes an iron core 1 and a secondary winding 2 wound on the iron core 1. The secondary terminal 3 of the secondary winding 2 is led out to the front of the transformer housing 7 by an insulator 8. The outer cover of the secondary terminal 3 is provided with a secondary wiring cover 4 and is fixed by a lead sealing nail 5.

[0030] In the embodiment of the utility model, the insulator 8 is an integrated structure formed by casting the coil body and the transformer housing with epoxy resin.

[0031] Specifically, the utility model provides a non-standard indoor fixed busbar current transformer, with a nameplate 6 on the front. The nameplate 6 is laser etched and cast into one piece with the current transformer to prevent the nameplate from being replaced and prevent electricity theft caused by changing the number of turns. The secondary wiring cover 4 is used to achieve the purpose of dust prevention and electricity theft prevention.

[0032] The transformer housing 7 is processed and spliced ​​with glass fiber wood boards according to the user's requirements for the product's external dimensions and opening dimensions; the product's secondary winding 2 is evenly wound on the annular iron core 1 to form a coil body with secondary wiring terminals 3 and secondary winding 2; the secondary winding 2 is placed in the transformer housing 7, and the position of the secondary wiring terminals 3 is adjusted according to customer requirements. After the distance is adjusted, it is cast and cured with epoxy resin, and then it becomes a transformer with secondary wiring terminals 3. The main body is a horizontally placed square cylinder shape, and the secondary winding 2 is sealed inside; the cross-sectional shape of the inner cavity primary busbar opening 9 is rectangular; it is used as a transition port for the primary busbar during installation and use, and different rectangular sizes can be realized according to the different current sizes of the transformer output terminals; it has strong vibration and impact resistance; the busbar fixing bolt structure of the product is convenient for flexible installation of the transformer; this product adopts a secondary wiring cover 4 and a laser-etched pattern nameplate 6, so that the product has a strong anti-theft function.

[0033] When in use, the transformer secondary output busbar passes directly through the busbar port and is fastened to the appropriate position of the primary busbar using the transformer busbar fixing bolts to complete the electrical and mechanical connection of the high-voltage electric field; then the electrical and mechanical connection of the secondary cable line is made to complete the installation.

[0034] The utility model provides a non-standard indoor fixed busbar current transformer, which is a new product designed in full accordance with national standards. It is cast with epoxy resin and adopts a rolled iron core. It uses the electromagnetic conversion principle and the electric field distribution principle to enable the secondary current to accurately reflect the change of the measured primary current and transmit it to the secondary metering and control device for current measurement and relay protection. It is widely used in transformer devices of power systems.

[0035] The utility model provides a non-standard indoor fixed busbar current transformer. The transformer housing 7 is made of epoxy glass fiber boards spliced ​​and glued according to the actual required size. The transformer housing 7 has the characteristics of high temperature resistance, high mechanical strength, strong flame retardancy, good electrical insulation performance, etc. Since the transformer housing 7 is spliced ​​and glued, the cost of opening the tire required for the cast product is saved. The transformer output terminal current transformer is small in size, high in mechanical strength, resistant to aging, long in service life, resistant to vibration and impact, and meets the strict requirements of customers on product size. The epoxy resin potting glue technology is adopted, which has the characteristics of room temperature curing, short curing time, small curing shrinkage, good bonding with the shell, etc., which greatly shortens the production cycle and improves production efficiency.

[0036] like Figures 3 to 8 As shown, another aspect of the utility model provides an installation structure of a non-standard indoor fixed busbar current transformer in the above-mentioned embodiment, comprising a transformer body 10, a fixing bar 12, a busbar 14 and a plurality of fixing components, wherein fixing bars 12 are embedded on the inner walls on opposite sides of the transformer body 10, the busbar 14 is inserted into the primary busbar port 9 of the transformer body 10, and the two ends of the busbar 14 are connected to the fixing bars 12 on both sides through a plurality of fixing components.

[0037] Specifically, an embedding groove is provided on the inner wall of the transformer housing 7 in the transformer body 10, and the fixing bar 12 is embedded in the embedding groove and is parallel to the busbar 14. Preferably, two embedding grooves are provided on each side wall of the transformer housing 7.

[0038] like Figure 3 , Figure 4 As shown, in one embodiment of the utility model, the transformer body 10 adopts a horizontal row and top row installation method, that is, the busbar 14 is inserted into the primary busbar port 9 of the transformer body 10 in the horizontal direction, and the fixing bar 12 is located on both sides of the busbar 14 and is parallel to the busbar 14. The fixing assembly includes a top row of bolts 11 and a pressure plate 13, wherein the pressure plate 13 is fixed on the busbar 14, and the top row of bolts 11 passes through the fixing bar 12 and the ends are threadedly connected to the pressure plate 13, so as to press the busbar 14 on both sides.

[0039] like Figure 5 , Figure 6 As shown, in another embodiment of the utility model, the transformer body 10 adopts a vertical top row installation mode, that is, the busbar 14 is arranged vertically in the primary busbar port 9, and the fixing bar 12 is located on both sides of the busbar 14 and parallel to the busbar 14. The fixing components in this embodiment are the same as those in the horizontal top row installation mode, and will not be repeated here.

[0040] like Figure 7 , Figure 8As shown, in another embodiment of the utility model, the transformer body 10 adopts a through-row installation method. The fixing assembly includes a through-row bolt 15 and a mounting nut 16, wherein the through-row bolt 15 sequentially penetrates the fixing bar 12 on one side and the busbar 14, and the end is threadedly connected to the fixing bar 12 on the other side, and a plurality of mounting nuts 16 for locking the busbar 14 and the fixing bar 12 are threadedly connected to the through-row bolt 15.

[0041] In summary, the transformer is fixed in a card-type manner. The accessory bayonet and the position of the secondary terminal can be adjusted according to actual needs, so that it can adapt to the installation of various busbar forms (vertical or horizontal). The accessory bolts use full-thread M8X60 bolts (the bolt length can also be adjusted according to actual needs). The busbar fixing bolts can be adjusted according to the busbar thickness, shape and position to adjust the installation position to achieve the function of fixing the busbar. All installation accessories are made of white steel 304, which meets the three-proof requirements, has stronger corrosion resistance and longer service life.

[0042] The utility model provides a non-standard indoor fixed busbar current transformer, which is mainly characterized by "non-standard" and the inner and outer diameters can be adjusted accordingly according to actual needs. This is different from the fixed inner and outer diameters of standard products, which limit the customer's installation or waste the copper used in the busbar.

[0043] The above description is only an implementation method of the utility model and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the utility model are included in the protection scope of the utility model.

Claims

1. A non-standard indoor fixed busbar current transformer, characterized in that: The invention comprises a coil body, a transformer shell (7) and an insulator (8), wherein the transformer shell (7) is a square structure formed by splicing epoxy glass fiber boards and has a primary busbar opening (9) at the center; the coil body is accommodated in the transformer shell (7) and is insulated and fixed by the insulator (8).

2. The non-standard indoor fixed busbar current transformer according to claim 1 is characterized in that: The insulator (8) is an integrated structure formed by casting the coil body and the mutual inductor housing (7) with epoxy resin.

3. The non-standard indoor fixed busbar current transformer according to claim 2 is characterized in that: A nameplate (6) is provided on the front of the current transformer. The nameplate (6) is laser etched and is integrally cast with the current transformer.

4. The non-standard indoor fixed busbar current transformer according to claim 1, characterized in that: The coil body comprises an iron core (1) and a secondary winding (2) wound on the iron core (1); a secondary wiring terminal (3) of the secondary winding (2) is led out from an insulator (8) to the front side of a transformer housing (7); a secondary wiring cover (4) is provided on the outer side of the secondary wiring terminal (3) and is fixed by a lead sealing nail (5).

5. The non-standard indoor fixed busbar current transformer according to claim 1, characterized in that: The primary busbar opening (9) is a rectangular hole.

6. An installation structure for a non-standard indoor fixed busbar current transformer according to any one of claims 1 to 5, characterized in that: The invention comprises a transformer body (10), a fixing bar (12), a busbar (14) and a plurality of fixing components, wherein fixing bars (12) are embedded on opposite sides of the inner wall of the transformer body (10), the busbar (14) is inserted into a primary busbar port (9) of the transformer body (10), and the two ends of the busbar (14) are connected to the fixing bars (12) on both sides through the plurality of fixing components.

7. The mounting structure according to claim 6, characterized in that: The fixing assembly comprises a top row of bolts (11) and a pressure plate (13), wherein the pressure plate (13) is fixed on the busbar (14), the top row of bolts (11) penetrates the fixing strip (12) and the ends are threadedly connected to the pressure plate (13), thereby tightening on both sides of the busbar (14).

8. The mounting structure according to claim 7, characterized in that: The busbar (14) is arranged horizontally or vertically in the primary busbar opening (9), and the fixing bars (12) are located on both sides of the busbar (14) and are parallel to the busbar (14).

9. The mounting structure according to claim 6, characterized in that: The fixing assembly comprises a through-row bolt (15) and a mounting nut (16), wherein the through-row bolt (15) sequentially passes through a fixing bar (12) on one side and a busbar (14), and an end portion is threadedly connected to the fixing bar (12) on the other side, and a plurality of mounting nuts (16) for locking the busbar (14) and the fixing bar (12) are threadedly connected to the through-row bolt (15).

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