Straight-through current transformer
By using the grounding design of the shielding layer and the secondary lead cable in the penetrating current transformer, the interference problem is solved and the passing rate of the local discharge test of the switch cabinet is improved.
Patent Information
- Application Number
- CN202323344642.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-08
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2033-12-08
AI Technical Summary
The existing penetrating current transformers are prone to interference, resulting in failure of partial discharge tests of the switch cabinet.
A through-center current transformer is designed, which is wound with a shield layer and connected to the secondary lead-out cable to ensure that the shield layer is grounded, thereby reducing interference signals and improving the test pass rate.
Through the interference shielding effect of the shielding layer and the conductance connection with the secondary lead cable, the internal interference signal is effectively reduced and the passing rate of the local discharge test of the switch cabinet is improved.
Smart Images
Figure CN222168128U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of current transformers, in particular to a through-type current transformer. Background Art
[0002] A through-type current transformer (also known as a busbar current transformer) is a device used to detect current. In many switch cabinets, through-type current transformers are used for current detection. However, existing through-type current transformers are prone to interference, resulting in failure of partial discharge tests of switch cabinets.
[0003] In view of the existence of the above problems, it is necessary to study a through-type current transformer, which can reduce interference to effectively improve the partial discharge test pass rate of the switch cabinet. Utility Model Content
[0004] The utility model aims to provide a through-type current transformer, which can reduce interference and effectively improve the pass rate of partial discharge test of switch cabinet.
[0005] In order to achieve the above purpose, the solution of the utility model is:
[0006] A through-type current transformer comprises a shell, a secondary lead cable, a secondary winding, and a shielding layer; the shielding layer is wound at least once, the secondary winding is arranged around the shielding layer, the secondary lead cable is respectively connected to the shielding layer and the secondary winding and is electrically conductive, the shell covers the shielding layer and the secondary winding, and the shell is provided with a through opening for the secondary lead cable to pass through.
[0007] The shell is made of insulating material.
[0008] The material of the shell is ABS.
[0009] The shielding layer is copper foil.
[0010] The shielding layer is connected to the secondary lead-out cable through a flexible wire.
[0011] The two ends of the flexible wire are respectively connected with the shielding layer and a core wire of the secondary lead-out cable by welding.
[0012] The welding point between the soft wire and the shielding layer has a smooth transition.
[0013] The welding point between the soft wire and the core wire of the secondary lead-out cable has a smooth transition.
[0014] The secondary winding is wound with enameled wire.
[0015] Each core wire of the secondary lead-out cable is respectively connected to each enameled wire of the secondary winding by welding, and each welding point between each core wire of the secondary lead-out cable and each enameled wire of the secondary winding is separately arranged.
[0016] After adopting the above scheme, a through-type current transformer of the utility model is provided with a shielding layer, which has an interference shielding effect, and the shielding layer is also connected to the secondary lead-out cable and electrically conductive. In this way, when a switch cabinet equipped with a through-type current transformer of the utility model is subjected to local convenient testing, the secondary lead-out cable is grounded and the shielding layer is also grounded. In this way, the interference signal inside the through-type current transformer of the utility model and other interference signals are grounded, thereby effectively reducing interference and effectively improving the pass rate of the local discharge test of the switch cabinet. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a cross-sectional view of the utility model.
[0018] Description of labels:
[0019] Shell 1, port 11,
[0020] Secondary lead cable 2, core wire 21,
[0021] Secondary winding 3, enameled wire 31,
[0022] Shielding layer 4,
[0023] Soft cord 5. DETAILED DESCRIPTION
[0024] In order to further explain the technical solution of the present utility model, the present utility model is described in detail below through specific embodiments.
[0025] like Figure 1 As shown, the utility model discloses a through-type current transformer, which includes a shell 1, a secondary lead cable 2, a secondary winding 3, and a shielding layer 4; the shielding layer 4 is wound at least one circle, the secondary winding 3 is arranged around the shielding layer 4, the secondary lead cable 2 is respectively connected to the shielding layer 4 and the secondary winding 3 and is electrically conductive, the shell 1 covers the shielding layer 4 and the secondary winding 3, and the shell 1 is provided with a through opening 11 for the secondary lead cable 2 to pass through.
[0026] In the utility model, a through-type current transformer of the utility model is provided with a shielding layer 4, which has an interference shielding effect, and the shielding layer 4 is also connected to the secondary lead cable 2 and electrically conductive, so that when a switch cabinet equipped with a through-type current transformer of the utility model is subjected to a local convenient test, the secondary lead cable 2 is grounded and the shielding layer 4 is also grounded, so that the interference signal and other interference signals inside the through-type current transformer of the utility model are grounded, thereby effectively reducing interference to effectively improve the pass rate of the local discharge test of the switch cabinet.
[0027] In the embodiment of the utility model, the shell 1 is made of insulating material, so that the shell 1 can be prevented from being electrically conductive with the secondary lead cable 2, the secondary winding 3 and the shielding layer 4, thereby preventing the use and safety of the through-type current transformer of the utility model from being affected. Specifically, the shell 1 is made of ABS, so that the shell 1 can be insulated and has high strength, thereby ensuring the durability of the through-type current transformer of the utility model.
[0028] In the embodiment of the utility model, the secondary lead cable 2 has a plurality of core wires 21, and the secondary winding 3 is wound with enameled wires 31, each core wire 21 of the secondary lead cable 2 is respectively welded and connected with each enameled wire 31 of the secondary winding 3, and each welding point between each core wire 21 of the secondary lead cable 2 and each enameled wire 31 of the secondary winding 3 is separately arranged to ensure that each enameled wire 31 of the secondary winding 3 is insulated from each other. In addition, the secondary winding 3 is wound with enameled wire 31, so that the secondary winding 3 and the shielding layer 4 can be insulated from each other.
[0029] In an embodiment of the utility model, the shielding layer 4 is copper foil, and the copper foil has a good shielding effect. The shielding layer 4 is connected to the secondary lead cable 2 through a soft wire 5, and the soft wire 5 is flexible and can avoid damaging the shielding layer 4 and the secondary winding 3. Specifically, the two ends of the soft wire 5 are respectively welded to the shielding layer 4 and a core wire 21 of the secondary lead cable 2, so that the soft wire 5 can firmly connect the shielding layer 4 and the secondary lead cable 2; wherein, the welding point between the soft wire 5 and the shielding layer 4 is smoothly transitioned, so that the welding point between the soft wire 5 and the shielding layer 4 can avoid damaging the shielding layer 4 and the secondary winding 3; similarly, the welding point between the soft wire 5 and the core wire 21 of the secondary lead cable 2 is smoothly transitioned, so that the welding point between the soft wire 5 and the core wire 21 of the secondary lead cable 2 can avoid damaging the shielding layer 4 and the secondary winding 3.
[0030] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.
Claims
1. A through-type current transformer, characterized in that: It includes a housing, a secondary lead cable, a secondary winding, and a shielding layer; The shielding layer is wound at least once, the secondary winding is arranged around the shielding layer, the secondary lead cable is connected to the shielding layer and the secondary winding respectively and is electrically conductive, the outer shell covers the shielding layer and the secondary winding and the outer shell is provided with a through hole for the secondary lead cable to pass through.
2. A through-type current transformer as claimed in claim 1, characterized in that: The shell is made of insulating material.
3. A through-type current transformer according to claim 1 or 2, characterized in that: The material of the shell is ABS.
4. A through-type current transformer as claimed in claim 1, characterized in that: The shielding layer is copper foil.
5. A through-type current transformer according to claim 1 or 4, characterized in that: The shielding layer is connected to the secondary lead-out cable through a flexible wire.
6. A through-type current transformer as claimed in claim 5, characterized in that: The two ends of the flexible wire are respectively connected with the shielding layer and a core wire of the secondary lead-out cable by welding.
7. A through-type current transformer as claimed in claim 6, characterized in that: The welding point between the soft wire and the shielding layer has a smooth transition.
8. A through-type current transformer as claimed in claim 6, characterized in that: The welding point between the soft wire and the core wire of the secondary lead-out cable has a smooth transition.
9. A through-type current transformer as claimed in claim 1, characterized in that: The secondary winding is wound with enameled wire.
10. A through-type current transformer as claimed in claim 9, characterized in that: Each core wire of the secondary lead-out cable is respectively connected to each enameled wire of the secondary winding by welding, and each welding point between each core wire of the secondary lead-out cable and each enameled wire of the secondary winding is separately arranged.