Modular current transformer structure

Abstract

The utility model relates to a modularization current transformer structure, including current transformer assembly, measuring device shell and support plate, wherein current transformer assembly includes double-thread screw, pressure plate, current transformer CT, cushion block, countersink plate, fastener, pressure plate is placed current transformer CT upper end, current transformer CT is placed on the countersink plate, the cushion block is placed on the countersink plate, the fastener is placed on the countersink plate, the measuring device shell is placed on the measuring device shell, the measuring device shell is placed on the measuring device shell, and the measuring device shell is placed on the measuring device shell. The counter bore plate is placed on the supporting plate, the supporting plate is fixed to the inner wall of the measuring device shell, the cushion blocks are evenly distributed along the outer diameter side of the current transformer CT, the double-thread screws penetrate through the pressing plate, the cushion blocks and the counter bore plate are fixed into a whole and then placed on the supporting plate, and the fasteners are installed at the positions where the double-thread screws penetrate through the upper end face of the pressing plate, the lower end face of the counter bore plate and the lower end face of the supporting plate respectively. According to the utility model, the integrally assembled current transformer is integrally mounted in the supporting plate in the shell of the measuring device and then fastened, so that the current transformer in the transformer is easier and more convenient to mount, operate and overhaul, the mounting quality of the current transformer is improved, and the safety and reliability of the overall performance of the transformer are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformer design and manufacturing, and specifically relates to a modular current transformer structure. Background Art

[0002] In recent years, with the rapid development of power transmission and transformation projects, the demand for transformers has increased dramatically. As the main accessory of transformers, the usage of current transformers has also increased dramatically. This has put forward higher requirements on the installation convenience and quality safety of current transformers in transformers. The traditional current transformer installation method connects the screw to the support plate of the measuring device housing, and then installs the current transformer and its assembly accessories one by one, and then tightens the upper end of the screw with nuts, washers and spring washers. This is time-consuming and labor-intensive, the operating space is limited, and the subsequent maintenance operation is difficult. Utility Model Content

[0003] In order to further facilitate and quickly install, operate and repair the current transformer, the utility model provides a modular current transformer structure, which makes the installation, operation and repair of the current transformer easier and more convenient, and the quality is more reliable.

[0004] The utility model is realized by the following technical solutions:

[0005] A modular current transformer structure comprises a current transformer assembly, a measuring device housing and a support plate, wherein the current transformer assembly comprises a double-headed screw, a pressing plate, a current transformer CT, a cushion block, a countersunk plate and fasteners, the pressing plate is placed on the upper end of the current transformer CT, the current transformer CT is placed on the countersunk plate, the countersunk plate is placed on the support plate, the support plate is fixed on the inner wall of the measuring device housing, the cushion blocks are evenly distributed along the outer diameter side of the current transformer CT, the double-headed screw passes through the pressing plate, the cushion block is fixed to the countersunk plate as a whole and then placed on the support plate, and the fasteners are respectively installed at the places where the double-headed screw passes through the upper end surface of the pressing plate, the lower end surface of the countersunk plate and the lower end surface of the support plate.

[0006] Furthermore, the fastener includes a nut, a washer and a spring washer that cooperate with each other.

[0007] Furthermore, the thread length of the upper end of the double-start screw is shorter than the thread length of the lower end.

[0008] Furthermore, the number of the double-headed screws is several.

[0009] Furthermore, the current transformer assembly also includes a plurality of pads, which are placed on the upper surface of the current transformer CT and are used for insulation protection and position limiting of the current transformer CT.

[0010] Furthermore, the outer dimensions of the spacer block and the slot spacer match the outer dimensions of the current transformer CT.

[0011] Furthermore, the current transformer assembly also includes a plurality of slot pads, which are stacked on the upper edge of the inner diameter side of the pad block and are used for insulation protection and position limiting of the current transformer CT.

[0012] Furthermore, the support plate is made of steel plate and is welded to the inner wall of the measuring device housing.

[0013] Further, the number of current transformers CT is an integer greater than or equal to 1.

[0014] Furthermore, a plurality of countersunk holes are arranged on the lower surface of the countersunk hole plate, and the number of the countersunk holes corresponds to the number of the double-headed screws.

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

[0016] A modular current transformer structure includes a current transformer assembly, a measuring device housing and a support plate. The current transformer CT and its assembly accessories are pre-installed and fastened as a whole, which not only ensures that the current transformer is not damaged during the installation process, but also facilitates the overall lifting during the later maintenance. The current transformer assembly includes a double-headed screw, a pressure plate, a current transformer CT, a cushion block, a countersunk plate and a fastener. The pressure plate is placed on the upper end of the current transformer CT, the lower end of the current transformer CT is placed on the countersunk plate, the countersunk plate is placed on the support plate, the support plate is fixed on the inner wall of the measuring device housing, and the cushion blocks are uniformly arranged along the outer diameter side of the current transformer CT. The double-headed screw passes through the pressure plate, the spacer and the countersunk plate and is fixed as a whole on the support plate. The fasteners include nuts, washers and spring washers that cooperate with each other. The current transformer CT, the pressure plate, the spacer and the countersunk plate are reliably fixed on the support plate through the double-headed screw, nuts, washers and spring washers. Relying on the countersunk plate, the current transformer CT is independently assembled, and the modular processing of the current transformer assembly of each phase of the transformer is realized at the same time, which effectively shortens the installation operation time of the workers in the casing of the measuring device, improves the installation quality of the current transformer, and ensures the reliability of the overall performance of the transformer product.

[0017] Furthermore, the thread length of the upper end of the double-headed screw is shorter than that of the lower end, which facilitates the installation of three sets of fasteners at the upper end and the lower end of the double-headed screw respectively, ensuring that the current transformer is installed firmly and not loose.

[0018] Furthermore, the number of the double-headed screws is several, and the number of the double-headed screws is determined according to the external dimensions of the current transformer.

[0019] Furthermore, the current transformer assembly also includes a plurality of pads and slot pads. The pads are placed on the upper surface of the current transformer CT, and the slot pads are stacked on the upper edge of the inner diameter side of the pad block for insulation protection and position limiting of the current transformer CT.

[0020] Furthermore, the outer dimensions of the pad and the slot pad match those of the current transformer CT, thereby effectively protecting the insulation layer of the current transformer and limiting the displacement of the current transformer CT.

[0021] Furthermore, the support plate is made of a steel plate, which is welded to the inner wall of the measuring device housing to ensure that the current transformer is firmly assembled and fixed in the measuring device housing.

[0022] Furthermore, the number of current transformers CT is an integer greater than or equal to 1 to meet the technical performance of the transformer product.

[0023] Furthermore, a plurality of countersunk holes are arranged on the lower surface of the countersunk hole plate, and the number of the countersunk holes corresponds to the number of the double-headed screw rods, so as to facilitate the installation of nuts, washers and spring washers at the lower ends of the double-headed screw rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional diagram of the modular current transformer structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the modular current transformer structure of the utility model.

[0026] Among them, 1 is a double-headed screw, 2 is a current transformer CT, 3 is a countersunk plate, 4 is a nut, 5 is a washer, 6 is a spring washer, 7 is a pressure plate, 8 is a measuring device housing, 9 is a support plate, 10 is a countersunk hole, 11 is a manhole, 12 is a cushion block, 13 is a cushion plate, and 14 is a slot cushion. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below with reference to the accompanying drawings:

[0028] A modular current transformer structure includes a current transformer assembly, a measuring device housing and a support plate 9, wherein the current transformer assembly includes a double-headed screw 1, a pressing plate 7, a current transformer CT2, a cushion block 12, a countersunk plate 3, and fasteners. The pressing plate 7 is placed on the upper end of the current transformer CT2, the current transformer CT2 is placed on the countersunk plate 3, the countersunk plate 3 is placed on the support plate 9, the support plate 9 is fixed to the inner wall of the measuring device housing 8, the cushion blocks 12 are evenly placed along the outer diameter side of the current transformer, the double-headed screw 1 passes through the pressing plate 7, the cushion block 12 is fixed to the countersunk plate 3 as a whole and then placed on the support plate 9, and the fasteners are respectively installed at the places where the double-headed screw 1 passes through the upper end surface of the pressing plate 7, the lower end surface of the countersunk plate 3 and the lower surface of the support plate 9.

[0029] Specifically, the fastener includes a nut 4, a washer 5 and a spring washer 6 which cooperate with each other.

[0030] Specifically, the length of the upper thread of the double-start screw 1 is shorter than the length of the lower thread.

[0031] Specifically, the number of the double-headed screws 1 is several.

[0032] Preferably, the current transformer assembly further includes a plurality of pads 13 and slot pads 14, wherein the pads 13 are placed on the upper surface of the current transformer CT2, and the slot pads 14 are stacked on the upper edge of the inner diameter side of the pad block 12, for insulation protection and position limiting of the current transformer CT2.

[0033] Specifically, the outer dimensions of the spacer block 12 and the slot spacer 14 match the outer dimensions of the current transformer CT2 .

[0034] More preferably, the support plate 9 is made of steel plate and is welded to the inner wall of the measuring device housing 8 .

[0035] Specifically, the number of the current transformers CT2 is an integer greater than or equal to 1.

[0036] More preferably, a plurality of countersunk holes 10 are provided on the lower surface of the countersunk hole plate 3 , and the number of the countersunk holes 10 corresponds to the number of the double-headed screws 1 .

[0037] As attached Figure 1 and attached Figure 2 As shown, firstly, a first set of nuts 4, washers 5 and spring washers 6 are fixed to the upper end of the stud screw 1, and then the current transformer CT2, cushion block 12, cushion plate 13 and slot pad 14 are assembled in sequence on the upper surface of the countersunk plate 3 where the countersunk hole is not opened. The upper end is compacted by a pressing plate 7, and the stud screw 1 passes through the countersunk plate 3. The second set of nuts 4, washers 5 and spring washers 6 are installed at the lower end thread of the stud screw 1 located in the countersunk hole 10, and the current transformer assembly is completed.

[0038] Finally, the current transformer is assembled as a whole and placed on the support plate 9 in the measuring device housing 8, ensuring that the stud screw 1 passes through the bolt opening of the support plate 9. The installer enters the measuring device housing 8 through the manhole 11 and installs the third set of nuts 4, washers 5 and spring washers 6 on the lower end threads of the stud screw 1 extending out of the bottom of the support plate 9. The modular current transformer installation is completed. This step is performed after the current transformer is assembled.

[0039] The upper end thread of the double-headed screw rod 1 of this structure is used for fastening the upper end part of the current transformer assembly, and the lower end thread of the double-headed screw rod 1 is used for fastening the current transformer and its assembly accessories in the countersunk hole 10 after assembly and for fastening the entire current transformer on the support plate 9, thereby realizing modular current transformer assembly.

[0040] In the utility model, the connection mode between the double-headed screw rod 1 and the support plate 9 is changed from the original welding assembly to the bolt and nut connection, so that the current transformer assembly does not rely on the measuring device housing 8, but relies on the countersunk plate 3 to form a modular current transformer structure outside the measuring device housing 8, thereby avoiding the secondary disassembly and assembly of the current transformer during testing, transportation and maintenance, reducing the entire installation operation procedure, optimizing the assembly process, saving installation time, and having good economic and social benefits.

Claims

1. A modular current transformer structure, comprising a current transformer assembly, a measuring device housing (8) and a support plate (9), wherein the current transformer assembly comprises a double-headed screw (1), a pressing plate (7), a current transformer CT (2), a cushion block (12), a countersunk plate (3) and a fastener, wherein the pressing plate (7) is placed on the upper end of the current transformer CT (2), the current transformer CT (2) is placed on the countersunk plate (3), the countersunk plate (3) is placed on the support plate (9), the support plate (9) is fixed to the inner wall of the measuring device housing (8), the cushion block (12) is evenly placed along the outer diameter side of the current transformer, the double-headed screw (1) passes through the pressing plate (7), the cushion block (12) is fixed to the countersunk plate (3) as a whole and then placed on the support plate (9), and the fasteners are respectively installed at the upper end surface of the pressing plate (7), the lower end surface of the countersunk plate (3) and the lower end surface of the support plate (9) where the double-headed screw (1) passes through.

2. A modular current transformer structure according to claim 1, characterized in that: The fastener comprises a nut (4), a washer (5) and a spring washer (6) which cooperate with each other.

3. A modular current transformer structure according to claim 1, characterized in that: The length of the upper thread of the double-headed screw (1) is shorter than the length of the lower thread.

4. A modular current transformer structure according to claim 3, characterized in that: The number of the double-headed screws (1) is several.

5. A modular current transformer structure according to claim 1, characterized in that: The current transformer assembly also includes a plurality of slot pads (14), which are stacked on the upper edge of the inner diameter side of the pad block (12) and are used for insulation protection and position limiting of the current transformer CT (2).

6. A modular current transformer structure according to claim 5, characterized in that: The current transformer assembly also includes a plurality of pads (13), which are placed on the upper surface of the current transformer CT (2) and are used for insulation protection and position limiting of the current transformer CT (2).

7. A modular current transformer structure according to claim 6, characterized in that: The outer dimensions of the pad (12), the pad (13) and the slot pad (14) match the outer dimensions of the current transformer CT (2).

8. A modular current transformer structure according to claim 1, characterized in that: The number of current transformers CT(2) is an integer greater than or equal to one.

9. A modular current transformer structure according to claim 1, characterized in that: The support plate (9) is made of a steel plate and is welded to the inner wall of the measuring device housing (8).

10. A modular current transformer structure according to claim 1, characterized in that: A plurality of countersunk holes (10) are arranged on the lower surface of the countersunk hole plate (3), and the number of the countersunk holes (10) corresponds to the number of the double-headed screw rods (1).

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