Self-integration multi-gain multi-band Rogowski coil type current transformer and preparation method thereof

Abstract

According to the self-integration multi-gain multi-band Rogowski coil type current transformer and the preparation method, in the current transformer, at least two layers of windings are wound on an open magnetic iron core framework, and the windings are connected with an integration resistor to form a self-integration Rogowski coil. According to the self-integration multi-gain multi-band Rogowski coil type current transformer, signals of different gains and frequency bands can be output at the same time by one transformer, the number of transformers is reduced in a use scene where multi-band current signals need to be measured, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of current transformers, in particular to a self-integrating multi-gain multi-band Rogowski coil type current transformer and a preparation method thereof. Background Art

[0002] The basic working principle of Rogowski coil for measuring current is the law of electromagnetic induction and Ampere's loop law. The current-carrying conductor passes vertically through the center of the skeleton. When the current to be measured flowing through the current-carrying conductor changes, a changing magnetic field will be generated around the conductor, so that the Rogowski coil produces electromagnetic induction and generates an induced electromotive force at the output end. The entire measurement process is implemented according to the law of electromagnetic induction. Therefore, the measurement circuit of the Rogowski coil is coupled with the current-carrying conductor through the magnetic field. There is no direct electrical connection, which will not affect the measurement circuit of the coil, and it has high safety and reliability.

[0003] At present, Rogowski coil type current transformers can only achieve single-band signal output, that is, the output signal of a product has a fixed gain and frequency band. When output signals with other gains and frequency bands are required, another transformer needs to be added. Due to the limitations of the use environment, it is difficult to arrange multiple current transformers together in a narrow space.

[0004] The information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0005] In view of the shortcomings or defects of the prior art, a self-integrating multi-gain multi-band Rogowski coil type current transformer and a preparation method are provided, which can simultaneously output signals of different gains and frequency bands, and the mutual interference between the output signals is suppressed by the structure of two half-turn windings output in parallel. A product can simultaneously output signals of different gains and frequency bands, which is used in scenarios where multi-band signals need to be measured.

[0006] The purpose of the present invention is achieved through the following technical solutions.

[0007] A self-integrating multi-gain multi-band Rogowski coil type current transformer comprises:

[0008] Open magnetic core frame,

[0009] At least two layers of windings are respectively wound around the open magnetic core frame and the windings are connected to integral resistors to form a self-integrating Rogowski coil.

[0010] In the self-integrating multi-gain multi-band Rogowski coil type current transformer, the winding includes a structure in which two half-cycle windings are connected in parallel and output.

[0011] In the self-integrating multi-gain multi-band Rogowski coil type current transformer, the open magnetic iron core skeleton is a circular ring structure with two openings.

[0012] In the self-integrating multi-gain multi-band Rogowski coil type current transformer, the two openings are symmetrically distributed.

[0013] In the self-integrating multi-gain multi-band Rogowski coil type current transformer, at least two layers of windings include a first layer of windings with two half-turn windings in parallel output structure wound on an open magnetic iron core frame and a second layer of windings with two half-turn windings in parallel output structure wound on an open magnetic iron core frame. The second layer of windings is stacked on the first layer of windings and the winding parameters of the second layer of windings are different from those of the first layer of windings. The winding parameters include the number of turns, winding material, winding wire diameter and integral resistance size.

[0014] In the self-integrating multi-gain multi-band Rogowski coil type current transformer, the first layer of winding includes a first winding material, a first winding having a first winding wire diameter and a first number of winding turns, and a first integrating resistor connected to the first winding; the second layer of winding includes a second winding material, a second winding having a second winding wire diameter and a second number of winding turns, and a second integrating resistor connected to the second winding.

[0015] In the self-integrating multi-gain multi-band Rogowski coil type current transformer, the first integrating resistor is different from the second integrating resistor, and the second winding is different from the first winding.

[0016] In the self-integrating multi-gain multi-band Rogowski coil type current transformer, the first integrating resistor is different from the second integrating resistor, the first winding material is the same as the second winding material, the first winding wire diameter is the same as the second winding wire diameter, and the first winding turns are different from the second winding turns.

[0017] In the self-integrating multi-gain multi-band Rogowski coil type current transformer, the output signal frequency band is adjusted by adjusting the number of turns of the winding, the winding material, the winding wire diameter or the integral resistance connected thereto.

[0018] The preparation method of the self-integrating multi-gain multi-band Rogowski coil type current transformer comprises the following steps:

[0019] Step 1, selecting an open magnetic core as a supporting open magnetic core skeleton;

[0020] Step 2, selecting winding material, winding wire diameter, winding turns and integral resistance to form different windings;

[0021] Step 3, winding two half-turn windings in parallel output structure on the open magnetic core frame, after winding one layer of winding, perform insulation packaging, and then wind the next layer of winding;

[0022] Step 4, put the finished winding into the shielding box and weld the integral resistor;

[0023] Step 5, use the BNC connector to lead out the voltage signal on the integrating resistor as the output of the transformer;

[0024] Step 6: Insulate and package the entire shielding box.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention winds multiple layers of windings on an open magnetic core so that a mutual inductor can output multiple signals with different gains and frequency bands, and utilizes a structure in which two half-turn windings are output in parallel to suppress mutual interference between the multiple layers of windings, thereby enabling a mutual inductor to simultaneously output signals with different gains and frequency bands, thereby reducing the number of mutual inductors and reducing costs in usage scenarios where multi-band current signals need to be measured.

[0027] The above description is only an overview of the technical solution of the present invention. In order to make the technical means of the present invention clearer and to achieve the extent that those skilled in the art can implement it according to the contents of the specification, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By reading the detailed description of the preferred specific embodiments below, various other advantages and benefits of the present invention will become clear to those of ordinary skill in the art. The drawings in the specification are only for the purpose of illustrating the preferred embodiments and are not considered to be limitations of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work. Moreover, the same reference numerals are used to represent the same components throughout the drawings.

[0029] In the attached picture:

[0030] Figure 1 This is the structure diagram of the current transformer for this application;

[0031] Figure 2 A flow chart for making a current transformer for this application.

[0032] The present invention is further explained below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0034] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the attached claims.

[0035] To facilitate understanding of the embodiments of the present invention, several specific embodiments will be further explained below with reference to the accompanying drawings, and each of the accompanying drawings does not constitute a limitation on the embodiments of the present invention.

[0036] For a better understanding, Figure 1 to Figure 2 As shown, a self-integrating multi-gain multi-band Rogowski coil type current transformer includes:

[0037] Open magnetic core frame,

[0038] At least two layers of windings are respectively wound around the open magnetic core frame and the windings are connected to integral resistors to form a self-integrating Rogowski coil.

[0039] In a preferred embodiment of the self-integrating multi-gain multi-band Rogowski coil type current transformer, the winding includes a structure in which two half-cycle windings are connected in parallel and output.

[0040] In a preferred embodiment of the self-integrating multi-gain multi-band Rogowski coil type current transformer, the open magnetic iron core skeleton is a circular ring structure with two openings.

[0041] In a preferred embodiment of the self-integrating multi-gain multi-band Rogowski coil type current transformer, the two openings are symmetrically distributed.

[0042] In a preferred embodiment of the self-integrating multi-gain multi-band Rogowski coil type current transformer, at least two layers of windings include a first layer of windings with two half-turn windings in parallel output structure wound on an open magnetic iron core frame and a second layer of windings with two half-turn windings in parallel output structure wound on an open magnetic iron core frame, the second layer of windings is stacked on the first layer of windings and the winding parameters of the second layer of windings are different from those of the first layer of windings, and the winding parameters include the number of turns, winding material, winding wire diameter and integral resistance size.

[0043] In a preferred embodiment of the self-integrating multi-gain multi-band Rogowski coil type current transformer, the first layer of winding includes a first winding material, a first winding having a first winding wire diameter and a first number of winding turns, and a first integrating resistor connected to the first winding, and the second layer of winding includes a second winding material, a second winding having a second winding wire diameter and a second number of winding turns, and a second integrating resistor connected to the second winding.

[0044] In a preferred embodiment of the self-integrating multi-gain multi-band Rogowski coil type current transformer, the first integrating resistor R t1 Different from the second integrating resistor R t2 , the second winding is different from the first winding.

[0045] In a preferred embodiment of the self-integrating multi-gain multi-band Rogowski coil type current transformer, the first integrating resistor is different from the second integrating resistor, the first winding material is the same as the second winding material, the first winding wire diameter is the same as the second winding wire diameter, and the first winding turns are different from the second winding turns.

[0046] In a preferred embodiment of the self-integrating multi-gain multi-band Rogowski coil type current transformer, the output signal frequency band is adjusted by adjusting the number of turns of the winding, the winding material, the winding wire diameter or the integral resistance connected thereto.

[0047] The preparation method of the self-integrating multi-gain multi-band Rogowski coil type current transformer comprises the following steps:

[0048] Step 1, selecting an open magnetic core as a supporting open magnetic core skeleton;

[0049] Step 2, selecting winding material, winding wire diameter, winding turns and integral resistance to form different windings;

[0050] Step 3, winding two half-turn windings in parallel output structure on the open magnetic core frame, after winding one layer of winding, perform insulation packaging, and then wind the next layer of winding;

[0051] Step 4, put the finished winding into the shielding box and weld the integral resistor;

[0052] Step 5, use the BNC connector to lead out the voltage signal on the integrating resistor as the output of the transformer;

[0053] Step 6: Insulate and package the entire shielding box.

[0054] In one embodiment, a self-integrating multi-gain multi-band Rogowski coil type current transformer includes an open magnetic iron core frame, a multi-layer winding and an integral resistor. The multi-layer winding can output signals of different gains and frequency bands due to different parameters. The open magnetic iron core frame adopts a structure of two half-turn windings connected in parallel to ensure that the multi-layer windings do not interfere with each other. Figure 2 The present invention is a production flow chart of a self-integrating multi-gain multi-band Rogowski coil type current transformer. First, an open magnetic core of a suitable size is selected as a supporting skeleton; further, a suitable winding material, winding wire diameter, winding turns and integral resistor are selected; further, a winding with two half-turn windings in parallel output structure is wound on the skeleton, and after winding one layer of winding, it is insulated and packaged, and then the next layer of winding is wound; further, the wound winding product is placed in a shielding box, and the integral resistor is welded; further, a BNC connector is used to lead out the voltage signal on the integral resistor as the output of the transformer; further, the shielding box is insulated and packaged as a whole.

[0055] In one embodiment, the self-integrating multi-gain multi-band Rogowski coil type current transformer is a multi-layer winding superposition structure. Multiple layers can be wound on the same open magnetic iron core frame, that is, one transformer can output signals of multiple gains and frequency bands; the gain and frequency band of the output signal of each layer of winding are affected by the parameters of each layer of winding. If the parameters of each layer of winding are inconsistent, the output signal frequency band is inconsistent. The winding parameters include the number of turns, winding material, winding wire diameter and integral resistance size; the structure of two half-turn windings in parallel output is used to weaken the mutual interference between the multi-layer windings. A multi-winding structure is formed by superimposing and winding multiple wires on the magnetic iron core frame, and an integral resistor is connected to the output end of each layer of winding to form a self-integrating Rogowski coil. The multi-layer winding can output signals of different frequency bands due to different parameters. The Rogowski coil type current transformer is an open-close structure. The open magnetic iron core skeleton is divided into two halves, each layer of winding includes two mirror-symmetrical half-turn windings. The wound windings and skeleton are placed in a shielding shell. The two half-turn windings are connected in parallel head to tail, and the head and tail are connected to the two ends of the integral resistor respectively. The voltage signal on the integral resistor is the output of the transformer. Multi-layer windings will increase the stray capacitance and reduce the bandwidth of the transformer. This structure of parallel output of two half-turn windings makes the stray capacitance induce the current in the two half-turn coils in opposite directions, and will cancel each other when flowing into the integral resistor, ensuring that the multi-layer windings will not interfere with each other.

[0056] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0057] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A self-integrating multi-gain multi-band Rogowski coil type current transformer, characterized in that: These include, Open magnetic core frame, At least two layers of windings are respectively wound around the open magnetic core frame and the windings are connected to integral resistors to form a self-integrating Rogowski coil.

2. The self-integrating multi-gain multi-band Rogowski coil type current transformer according to claim 1, characterized in that: Preferably, the winding includes two parallel output structures.

3. The self-integrating multi-gain multi-band Rogowski coil type current transformer according to claim 1, characterized in that: The first layer winding includes a first winding material, a first winding having a first winding wire diameter and a first number of winding turns, and a first integral resistor connected to the first winding. The second layer winding includes a second winding material, a second winding having a second winding wire diameter and a second number of winding turns, and a second integral resistor connected to the second winding.

4. The self-integrating multi-gain multi-band Rogowski coil type current transformer as claimed in claim 3, characterized in that: The second winding is different from the first winding.

5. The self-integrating multi-gain multi-band Rogowski coil type current transformer as claimed in claim 3, characterized in that: The first number of winding turns is different from the second number of winding turns.

6. A preparation method, characterized in that: The method is used for preparing the self-integrating multi-gain multi-band Rogowski coil type current transformer as described in any one of claims 1 to 5.

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