Bus-type mutual inductor with uniform electric field
By spraying a semiconductor paint layer onto the inner wall of the wiring hole of the busbar transformer and introducing copper braided wires, the problem of uneven electric field was solved, a uniform electric field distribution was achieved, and the stability and safety of the equipment were improved.
Patent Information
- Application Number
- CN202423222182.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-26
AI Technical Summary
The electric field distribution at the high-voltage end of existing bus-type current transformers is uneven, resulting in excessively high local electric field strength, which affects the safety and lifespan of the equipment.
A semiconductor paint layer is sprayed onto the inner wall of the wire hole of the current transformer body, and then led to the primary conductor through a copper braided wire to form a uniform electric field and enhance the uniformity of the electric field.
It improves the uniformity of the electric field, reduces partial discharge, and enhances the stability and safety of the equipment.
Smart Images
Figure CN223757380U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a mutual inductor, specifically busbar mutual inductor of even electric field. BACKGROUND
[0002] The busbar current transformer is a kind of measuring and protection equipment widely used in power system, and its main function is to convert high current into low current by electromagnetic induction principle, to facilitate the use of measurement and relay protection device. In order to ensure its accuracy and reliability, busbar current transformer has strict technical requirements for electric field uniformity. In the working process of current transformer, the uniformity of electric field directly affects its measurement accuracy and stability. If the electric field is not uniform, it will lead to the local electric field strength too high, thereby causing the aging or breakdown of insulating material, and further affecting the safety and life of the equipment. The high voltage end of the existing busbar current transformer is in the position of the through hole of the mutual inductor, and if the electric field is not uniform, it is easy to cause damage to the mutual inductor. SUMMARY
[0003] The utility model provides a busbar mutual inductor of even electric field with simple structure, which can make the electric field of high voltage end uniform and ensure the stability of product partial discharge.
[0004] The utility model discloses a busbar mutual inductor of even electric field, which is characterized by comprising an epoxy resin cast mutual inductor body, the mutual inductor body is in cylindrical shape, a through hole is formed in the center axis of the mutual inductor body, an iron core and a coil are embedded in the outer peripheral wall of the through hole of the mutual inductor body, a semiconductor paint layer is sprayed on the hole wall of the through hole, the semiconductor paint layer is connected to a primary wire through a wire, and the wire is a copper braided wire.
[0005] The wire is connected to the primary wire through a wire nose.
[0006] The hole wall of the through hole is sprayed with a semiconductor paint layer after sand blasting treatment.
[0007] A mounting flange is arranged in the outer periphery of the mutual inductor body, and a plurality of mounting holes are uniformly distributed on the mounting flange.
[0008] The thickness of the semiconductor paint layer is 250 microns.
[0009] The utility model has the advantages that a layer of semiconductor paint layer is attached to the inner wall of the through hole of the mutual inductor body by sand blasting treatment, and the semiconductor paint layer is led to the primary wire through a copper braided wire, the paint layer is not easy to peel off, the electric field of the high voltage end is uniform, the product partial discharge is reduced, and the stability of the product is effectively improved. BRIEF DESCRIPTION OF DRAWINGS
[0010] Figure 1 The utility model structure schematic drawing is shown in the figure;
[0011] In the figure: mutual inductor body 1, threading hole 2, semiconductive paint layer 3, mounting flange 4, mounting hole 5, copper braid 6, terminal nose 7. DETAILED DESCRIPTION
[0012] Further described below in conjunction with the drawings.
[0013] Figure 1 As shown: a bus-type mutual inductor of uniform electric field, comprising an epoxy resin cast mutual inductor body 1, the mutual inductor body is cylindrical, a threading hole 2 is axially formed in the mutual inductor body, a built-in core and coil are arranged in the outer wall of the threading hole of the mutual inductor body, a semiconductive paint layer 3 is sprayed on the hole wall of the threading hole 2, and the semiconductive paint layer 3 is connected to a primary conductor via a copper braid 6 and a terminal nose 7 at the end thereof. A mounting flange 4 is arranged in the middle of the outer periphery of the mutual inductor body 1, and a plurality of mounting holes 5 are uniformly distributed around the circumference of the mounting flange 4.
[0014] In this embodiment, the hole wall of the threading hole 2 is sandblasted and then the semiconductive paint layer 3 is sprayed.
[0015] On the basis of this embodiment, the thickness of the semiconductive paint layer is preferably 250 μm.
Claims
1. A uniform electric field bus-type mutual inductor, characterized by: The utility model relates to a kind of bushing, including epoxy resin casting mutual inductor body, mutual inductor body is cylindrical, wire hole is opened in the center axis in mutual inductor body, the wire hole outer wall thickness of mutual inductor body is built-in core and coil, the hole wall of wire hole is sprayed semiconductor paint layer, semiconductor paint layer is connected with wire by wire, and the wire is copper braided wire.
2. A uniform electric field bus-type mutual inductor according to claim 1, characterized in that: The wire is connected with the wire by the wire nose.
3. A uniform electric field bus-type mutual inductor according to claim 1, characterized in that: The hole wall of the wire hole is sprayed with the semiconductor paint layer after sand blasting treatment.
4. A uniform electric field bus-type mutual inductor according to claim 1, characterized in that: A plurality of mounting holes are uniformly distributed around the circumference of the mounting flange on the outer periphery of the mutual inductor body.
5. A uniform electric field bus-type mutual inductor according to claim 1, characterized in that: The thickness of the semiconductor paint layer is 250 μm.