Bus-type current transformer with live-line display function
By integrating secondary windings and high-voltage capacitors in busbar current transformers and connecting them with busbar copper bars using voltage equalization shielding network, the discharge problem caused by limited space in the switch cabinet is solved, and the integration of current transformer and live display functions is realized , reduces the number of components and local discharge level and improves signal stability.
Patent Information
- Application Number
- CN202421017715.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-05-11
AI Technical Summary
In the existing 3000-4000A high current mid-type switch cabinet, the busbar current transformer and live display are independent products, resulting in the small distance between components when the switch cabinet space is limited, which is prone to discharge, affecting normal operation.
Design a bus-type current transformer with live display function. By integrating secondary windings and high-voltage capacitors into the casting body shell, and connecting them with the busbar copper bar with a voltage equalization shielding net to achieve the integration of the current transformer and live display function. Reduce local discharge phenomenon.
The number of components in the switch cabinet is reduced, costs are reduced, space is saved, and the electric field distribution is improved through the voltage equalization shielding network, which reduces the local discharge level and ensures the signal is sensitive and stable.
Smart Images
Figure CN222233452U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of current transformers, in particular to a busbar current transformer with a live display function. Background Art
[0002] With the development of my country's power system, domestic 3000-4000A high-current center-mounted switchgear mainly uses busbar current transformers for current measurement, electric energy metering and relay protection. The live sensor and live display cooperate with each other as a device to monitor whether the equipment is running with power. The live sensor is also used as an insulating support for the high-voltage busbar in the switchgear. The two main components in the existing switchgear are two different independent product structure forms, which are in different positions according to the switchgear structure. With the trend of miniaturization of switchgear, the space inside the switchgear is limited, resulting in too small distances between components, which are prone to discharge between each other, affecting the normal operation of the switchgear. Utility Model Content
[0003] The purpose of the utility model is to provide a busbar current transformer with a live display function to solve the problems existing in the above-mentioned prior art. It has both a transformer and a live display function, has sensitive and stable signals, a compact structure, and can reduce the number of components in the switch cabinet.
[0004] To achieve the above purpose, the utility model provides the following solutions:
[0005] The utility model provides a busbar current transformer with a live display function, comprising a secondary winding, a high-voltage capacitor, a bracket and a cast body shell, wherein the cast body shell is a cylindrical structure with a through hole in the center, the secondary winding, the bracket and the high-voltage capacitor are all fixed inside the cast body shell, the secondary winding is fixed on the bracket, a voltage-equalizing shielding net is fixedly connected to the inner side wall of the cast body shell, the voltage-equalizing lead of the voltage-equalizing shielding net is used to be fixed on a busbar copper bar passing through the through hole, a transformer secondary terminal and a high-voltage capacitor low-voltage terminal are arranged on the cast body shell, the secondary winding is connected to the transformer secondary terminal, the high-voltage end of the high-voltage capacitor is welded to the voltage-equalizing shielding net, and the low-voltage end of the high-voltage capacitor is connected to the low-voltage terminal of the high-voltage capacitor.
[0006] Preferably, the number of the secondary windings is two, and the two secondary windings are fixedly disposed on two sides of the bracket respectively.
[0007] Preferably, the secondary winding includes an annular iron core, an iron core insulation layer, a secondary winding lead and a semi-conductive shielding layer, the iron core insulation layer is wound around the outside of the annular iron core, the secondary winding lead is wound around the outside of the iron core insulation layer, and the semi-conductive shielding layer is wound around the outside of the secondary winding lead.
[0008] Preferably, the casting body shell is made of epoxy resin.
[0009] Preferably, the high-voltage capacitor is a high-voltage ceramic capacitor.
[0010] Compared with the prior art, the utility model has achieved the following technical effects:
[0011] The utility model provides a busbar current transformer with a live display function. The secondary winding and the high-voltage capacitor are fixed inside the cast body shell, the live sensor and the current transformer are integrated into one, and the current transformer and the live display function are provided at the same time, so that the number of components in the switch cabinet can be reduced, the cost can be reduced, and the switch cabinet space can be saved; the equalizing shielding net fixedly connected to the inner wall of the cast body shell is connected to the busbar copper bar via the equalizing lead wire, so that the inner wall of the current transformer and the busbar copper bar can have the same potential, and the occurrence of discharge phenomenon is reduced; and the equalizing shielding net can improve the electric field distribution between the equalizing shielding net and the secondary winding, and reduce the level of local discharge. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0013] Figure 1 It is a structural schematic diagram of a busbar current transformer with a live display function of the utility model;
[0014] Figure 2 It is a front view of a busbar current transformer with a power display function according to the utility model.
[0015] In the figure: 1-casting body shell; 2-secondary winding; 3-bracket; 4-high-voltage capacitor; 5-equalizing shielding net; 6-busbar copper bar; 7-equalizing lead; 8-fixing bolt; 9-low-voltage end lead; 10-secondary winding lead; 11-high-voltage capacitor low-voltage terminal; 12-transformer secondary terminal. DETAILED DESCRIPTION
[0016] 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.
[0017] The purpose of the utility model is to provide a busbar current transformer with a live display function to solve the problems existing in the above-mentioned prior art. It has both a transformer and a live display function, has sensitive and stable signals, a compact structure, and can reduce the number of components in the switch cabinet.
[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0019] The utility model provides a busbar current transformer with a live display function, such as Figure 1-2 As shown, it includes a secondary winding 2, a high-voltage capacitor 4, a bracket 3 and a cast body shell 1. The cast body shell 1 is a cylindrical structure with a through hole in the center. The secondary winding 2, the bracket 3 and the high-voltage capacitor 4 are all fixed inside the cast body shell 1. The secondary winding 2 is fixed on the bracket 3. The inner side wall of the cast body shell 1 is fixedly connected with a voltage-equalizing shielding net 5. The voltage-equalizing lead 7 of the voltage-equalizing shielding net 5 is fixedly connected to the busbar copper bar 6 passing through the through hole through a fixing bolt 8. The cast body shell 1 is provided with a transformer secondary terminal 12 and a high-voltage capacitor low-voltage terminal 11. The secondary winding 2 is connected to the transformer secondary terminal 12 through the secondary winding lead 10. The high-voltage end of the high-voltage capacitor 4 is welded to the voltage-equalizing shielding net 5, and the low-voltage end of the high-voltage capacitor 4 is connected to the low-voltage terminal 11 of the high-voltage capacitor through the low-voltage end lead 9. The secondary winding 2 and the high-voltage capacitor 4 are both fixed inside the cast body shell 1, integrating the live sensor and the current transformer into one, with a compact structure and easy installation. It also has the current transformer and live display functions, which can reduce the number of components in the switch cabinet, reduce costs, and save switch cabinet space; the equalizing shielding net 5 fixedly connected to the inner wall of the cast body shell 1 is connected to the busbar copper bus 6 via the equalizing lead, which can make the inner wall of the current transformer and the busbar copper bus 6 have the same potential, avoiding the busbar copper bus 6 from discharging to the inner wall of the current transformer, and the equalizing shielding net 5 can improve the electric field distribution between the equalizing shielding net and the secondary winding 2, thereby reducing the level of local discharge.
[0020] It is further preferred in the implementation manner of the present invention that the number of the secondary windings 2 is two, and the two secondary windings 2 are fixedly disposed on two sides of the bracket 3 respectively.
[0021] In the embodiment of the utility model, it is further preferred that the secondary winding 2 includes an annular iron core, an iron core insulation layer, a secondary winding lead 10 and a semi-conductive shielding layer, the outer side of the annular iron core is wound with an iron core insulation layer, the outer side of the iron core insulation layer is wound with a secondary winding lead 10, and the outer side of the secondary winding lead 10 is wound with a semi-conductive shielding layer. The semi-conductive shielding layer can improve the electric field distribution and reduce the level of partial discharge.
[0022] It is further preferred in the embodiment of the present invention that the material of the casting body shell 1 is epoxy resin.
[0023] It is further preferred in the implementation manner of the present invention that the high-voltage capacitor 4 is a high-voltage ceramic capacitor, which has the characteristics of small size, high voltage resistance and low loss.
[0024] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.
Claims
1. A busbar current transformer with a live display function, characterized in that: It includes a secondary winding, a high-voltage capacitor, a bracket and a cast body shell. The cast body shell is a cylindrical structure with a through hole in the center. The secondary winding, the bracket and the high-voltage capacitor are all fixed inside the cast body shell. The secondary winding is fixed on the bracket. The inner side wall of the cast body shell is fixedly connected with a voltage-equalizing shielding net. The voltage-equalizing lead of the voltage-equalizing shielding net is used to be fixed on the busbar copper bar passing through the through hole. The cast body shell is provided with a transformer secondary terminal and a high-voltage capacitor low-voltage terminal. The secondary winding is connected to the transformer secondary terminal, the high-voltage end of the high-voltage capacitor is welded to the voltage-equalizing shielding net, and the low-voltage end of the high-voltage capacitor is connected to the low-voltage terminal of the high-voltage capacitor.
2. The busbar current transformer with a live display function according to claim 1 is characterized in that: The number of the secondary windings is two, and the two secondary windings are respectively fixedly arranged on two sides of the bracket.
3. The busbar current transformer with a live display function according to claim 1 is characterized in that: The secondary winding comprises an annular iron core, an iron core insulation layer, a secondary winding lead and a semi-conductive shielding layer. The iron core insulation layer is wound around the outer side of the annular iron core, the secondary winding lead is wound around the iron core insulation layer, and the semi-conductive shielding layer is wound around the secondary winding lead.
4. The busbar current transformer with a live display function according to claim 1 is characterized in that: The material of the casting body shell is epoxy resin.
5. The busbar current transformer with a live display function according to claim 1 is characterized in that: The high-voltage capacitor is a high-voltage ceramic capacitor.