Miniaturized 35kV pillar type current transformer

Abstract

The utility model discloses a miniaturized 35kV pillar type current transformer which comprises a hollow epoxy resin shell, a hollow annular iron core is installed in the epoxy resin shell, and a conducting rod penetrates through the hollow part of the annular iron core in the horizontal direction. The two ends of the conducting rod are respectively connected with the primary wiring positive terminal and the primary wiring negative terminal through connecting plates along the vertical direction; a secondary coil is wound on the annular iron core, the two ends of the secondary coil are connected with a secondary wiring positive terminal and a secondary wiring negative terminal respectively, and the secondary wiring positive terminal and the secondary wiring negative terminal are installed in a transparent junction box on the outer side face of the epoxy resin shell. The current transformer is low in material consumption and low in equipment cost, and the safety and installation simplicity of the current transformer are improved.

Description

Technical Field

[0001] The invention relates to the field of electric power measuring equipment, and in particular to a miniaturized 35kV pillar-type current transformer. Background Art

[0002] The current transformer plays the role of current conversion and electrical isolation. It is a sensor for measuring instruments, relay protection and other secondary equipment in the power system to obtain the current information of the electrical primary circuit. The current transformer converts high current into low current in proportion. The primary side of the current transformer is connected to the primary system, and the secondary side is connected to the measuring instrument, relay protection, etc. The current transformer is generally composed of a primary coil, a secondary coil, an iron core, an insulating support and an outlet terminal. At present, the design of indoor pillar-type current transformers has problems such as complex structure and high cost. Summary of the invention

[0003] In view of the above problems, the present invention provides a current transformer with low consumables, low equipment cost, safety, reliability and easy installation.

[0004] In order to achieve the above object, the present invention provides a miniaturized 35kV pillar-type current transformer, which comprises: a hollow epoxy resin shell, a hollow annular iron core is installed in the epoxy resin shell, a conductive rod is passed through the hollow part of the annular iron core in the horizontal direction, one end of the conductive rod is connected to the primary wiring positive terminal through a connecting plate in the vertical direction, and the other end of the conductive rod is connected to the primary wiring negative terminal through the connecting plate in the vertical direction;

[0005] A secondary coil is wound on the annular iron core, one end of the secondary coil is connected to a secondary wiring positive terminal, and the other end of the secondary coil is connected to a secondary wiring negative terminal. The secondary wiring positive terminal and the secondary wiring negative terminal are installed in a transparent junction box on the outer side of the epoxy resin shell.

[0006] In a preferred embodiment, the lower surface of the epoxy resin housing is fixedly connected to a mounting base plate via a grounding bolt.

[0007] In a preferred manner, an arc-shaped shielding net is installed on the outer side of the annular core along the vertical direction, and the arc-shaped shielding net is installed on the lower surface inside the epoxy resin shell by fixing bolts.

[0008] In a preferred embodiment, fixing holes are provided at four corners of the mounting base plate.

[0009] The beneficial effects of the present invention are as follows: the present invention has a small volume, a reasonable layout, convenient installation, low consumables, low equipment cost, improves the safety of the current transformer and the ease of installation, and is a safe, reliable and easy-to-install current transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention.

[0011] In the figure: 1. Primary wiring terminal; 2. Connecting plate; 3. Conductive rod; 4. Shielding net; 5. Epoxy resin shell; 6. Grounding bolt; 7. Mounting base plate; 8. Junction box; 9. Secondary wiring terminal. DETAILED DESCRIPTION Specific embodiment:

[0013] like Figure 1 As shown in the figure, this product is an indoor pillar-type current transformer, which is suitable for power systems with rated frequency of 50Hz±0.5Hz and rated voltage of 40.5kV and below, for energy metering, measurement and protection. This type of current transformer is a pillar-type structure, and the iron core is wound and formed by high-quality cold-rolled silicon steel sheets. It adopts advanced vacuum casting technology and epoxy resin casting. The secondary terminal is equipped with a transparent junction box, which can be sealed to prevent electricity theft. Its specific structure includes: 1. Primary terminal; 2. Connection plate; 3. Conductive rod; 4. Shielding net; 5. Epoxy resin shell; 6. Grounding bolt; 7. Mounting base plate; 8. Junction box; 9. Secondary terminal. This product uses copper wire to wind on the iron core to make the secondary coil, fix the secondary coil in the transformer mold, connect the secondary coil outlet to the terminal, and complete the transformer shaping by epoxy resin casting. Finally, the transformer and the base plate are assembled.

[0014] The iron core is formed by winding high-quality cold-rolled silicon steel sheets, adopts a fully enclosed structure, and is shielded inside. The partial discharge level meets international requirements; the fully enclosed structure, the iron core and the coil are enclosed inside. The service life of the current transformer is improved. The invention has low consumables and low equipment cost, improves the safety of the current transformer and the ease of installation, and is a safe, reliable, easy to transport and install current transformer.

[0015] The application scope of the present invention is suitable for indoor protection, metering and measurement.

[0016] The use environment of the present invention is as follows: load power factor cosφ=0.8 (lagging); ambient temperature is between -25°C and 40°C; daily average temperature is not higher than 35°C; altitude does not exceed 2000m.

[0017] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A miniaturized 35kV pillar-type current transformer, characterized in that: It includes: A hollow epoxy resin shell, wherein a hollow annular iron core is installed in the epoxy resin shell, a conductive rod is passed through the hollow part of the annular iron core in the horizontal direction, one end of the conductive rod is connected to the primary wiring positive terminal through a connecting plate in the vertical direction, and the other end of the conductive rod is connected to the primary wiring negative terminal through the connecting plate in the vertical direction; A secondary coil is wound on the annular iron core, one end of the secondary coil is connected to a secondary wiring positive terminal, and the other end of the secondary coil is connected to a secondary wiring negative terminal. The secondary wiring positive terminal and the secondary wiring negative terminal are installed in a transparent junction box on the outer side of the epoxy resin shell.

2. According to the miniaturized 35kV pillar-type current transformer of claim 1, it is characterized in that: The lower surface of the epoxy resin shell is fixedly connected to a mounting base plate via a grounding bolt.

3. The miniaturized 35kV pillar-type current transformer according to claim 1 is characterized in that: An arc-shaped shielding net is installed on the outer side of the annular iron core along the vertical direction, and the arc-shaped shielding net is installed on the lower surface inside the epoxy resin shell through fixing bolts.

4. The miniaturized 35kV pillar-type current transformer according to claim 2 is characterized in that: The four corners of the installation base plate are all provided with fixing holes.

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