High-temperature-resistant Rogowski coil

Abstract

The utility model relates to the technical field of electromagnetic induction coils, in particular to a high-temperature-resistant Rogowski coil. The high-temperature-resistant Rogowski coil comprises a coil body and a connecting part, the coil body comprises a coil framework, an induction coil is wound outside the coil framework, a first shielding layer is sleeved outside the induction coil, an insulating layer is sleeved outside the first shielding layer, and the coil framework comprises a copper conductor. A silica gel insulating sheath is sleeved outside the copper conductor; the connecting part comprises joints and leads, the joints are fixedly matched with two ends of the coil body, and the leads are electrically connected with the induction coil. Through the arrangement of a high-temperature-resistant multi-layer structure, the high-temperature-resistant cable is suitable for being used in extremely high-temperature scenes, and has better stability in use.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electromagnetic induction coil, specifically, a high temperature resistant rogowski coil. BACKGROUND

[0002] Rogowski Coil is a kind of non-contact current sensor based on Faraday's law of electromagnetic induction, and it is widely used in high-frequency current measurement of power system, industrial equipment and new energy field due to its unique structure and performance advantages. It adopts non-magnetic core hollow winding design, and the uniform spiral coil wound on the non-magnetic skeleton induces the magnetic field change around the measured conductor, and outputs voltage signal proportional to current change rate.

[0003] However, the conventional rogowski coil currently adopts copper wire and non-magnetic plastic winding. In high temperature environment, the thermal expansion coefficient of coil skeleton does not match the wire, and local stress concentration is easy to cause, which leads to coil geometric deformation, directly affecting the stability of mutual inductance coefficient. UTILITY MODEL CONTENTS

[0004] The utility model provides a high temperature resistant rogowski coil, which can overcome the poor stability of conventional rogowski coil in high temperature environment in the prior art.

[0005] According to the high temperature resistant rogowski coil of the utility model, it includes coil body and connecting portion, coil body includes coil skeleton, and induction coil is wound outside coil skeleton, first shielding layer is provided outside induction coil, insulating layer is provided outside first shielding layer, coil skeleton includes copper conductor, and silica gel insulating outer skin is provided outside copper conductor;Connecting portion includes connector and lead wire, connector is used for fixedly matched with both ends of coil body, and lead wire is electrically connected with induction coil.

[0006] In the preferred embodiment of the utility model, the induction coil is a polyimide enameled wire.

[0007] In the preferred embodiment of the utility model, the first shielding layer includes a cylindrical sleeve woven by tinned copper wire, and the cylindrical sleeve is used for wrapping the induction coil.

[0008] In the preferred embodiment of the utility model, the insulating layer is a silica gel heat shrink tube.

[0009] In the preferred embodiment of the utility model, the lead wire includes a wire, a second shielding layer is provided outside the wire, and the second shielding layer is electrically connected with the first shielding layer.

[0010] In the preferred embodiment of the utility model, a temperature fuse is connected in series at the lead wire, and the temperature fuse is arranged in the connector.

[0011] In the preferred embodiment of the utility model, a high temperature resistant sleeve is provided outside the insulating layer.

[0012] Beneficial effects:

[0013] The high-temperature-resistant Rogowski coil provided by the embodiment of the utility model keeps the stability of geometric shape and the stability of working state under the high-temperature environment of 200 DEG C through the multi-layer high-temperature-resistant structure.

[0014] Further, the first shielding layer and the second shielding layer are arranged, so that the noise interference and the clutter interference from the outside can be shielded, thereby further ensuring that the Rogowski coil has very good precision and linearity signal output when measuring the product output. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is a local sectional structure schematic view when the high-temperature-resistant Rogowski coil is wound in at least one embodiment of the utility model.

[0016] Fig. 2 It is a structure schematic view of the high-temperature-resistant Rogowski coil in at least one embodiment of the utility model. DETAILED DESCRIPTION

[0017] It is found that Figs. 1-2 The embodiment provides a high-temperature-resistant Rogowski coil, which comprises:

[0018] The coil body comprises a coil framework 1, an induction coil 2 is wound outside the coil framework 1, a first shielding layer 3 is arranged outside the induction coil 2, and an insulation layer 4 is arranged outside the first shielding layer 3.

[0019] The connecting part comprises a connector 5 and a lead wire 6, the connector 5 is used for fixedly cooperating with both ends of the coil body, the lead wire 6 is electrically connected with the induction coil 2, and the lead wire 6 is used for electrically connecting with an external device, so that the signal generated at the induction coil 2 can be output.

[0020] Specifically, the coil framework 1 can support the induction coil 2, the first shielding layer 3 can shield the noise interference and the clutter interference from the outside, thereby further ensuring that the Rogowski coil has very good precision and linearity signal output when measuring the product output, and the insulation layer 4 has the protection and insulation functions, thereby protecting the induction coil 2 and the coil framework 1 inside.

[0021] The coil framework 1 is a copper conductor wrapped with a silica gel insulation skin, the temperature resistance range of the silica gel is -60 DEG C to 250 DEG C, and the copper conductor has good high-temperature stability.

[0022] Further, the induction coil 2 is a polyimide enameled wire, the temperature resistance range of the polyimide enameled wire is -60 DEG C to 220 DEG C, so that the polyimide enameled wire has strong stability under the high-temperature environment and can keep good output signal capacity under the high-temperature environment.

[0023] In addition, the first shielding layer 3 comprises a cylindrical sleeve woven by tinned copper wires, which is used to wrap the induction coil 2, and has a temperature resistance range of -60°C to 280°C, so that the first shielding layer 3 can maintain good structural stability in a high-temperature environment.

[0024] In some embodiments, the insulating layer 4 is a silica gel heat shrink tube, which has excellent insulation and softness and high-temperature resistance, and good stability in a high-temperature environment.

[0025] In some embodiments, the joint 5 is made of polyether ether ketone material, which has a temperature resistance range of -50°C to 250°C, and has good mechanical strength and wear resistance. In use, the two ends of the coil body are fixedly connected with the joint 5 to form a circular structure, which is sleeved on the cable.

[0026] In some embodiments, the lead wire 6 is a double-core shielded lead wire, which comprises a conductor wire, and a second shielding layer is sleeved on the conductor wire, and the second shielding layer is electrically connected with the first shielding layer 3, so as to enhance the ability of the Rogowski coil to shield external interference.

[0027] The second shielding layer is made of polytetrafluoroethylene material, which has a temperature resistance range of -200°C to 260°C and good high and low temperature stability.

[0028] In some embodiments, a temperature fuse 7 is connected in series at the lead wire, which is arranged in the joint. The breaking temperature of the temperature fuse is 216°C. By arranging the temperature fuse 7, the Rogowski coil can be effectively broken when the working temperature exceeds the rated working temperature.

[0029] It can be understood that if the secondary coil of a conventional current transformer (CT) is broken, high voltage danger will be caused due to magnetic saturation of the core. However, the Rogowski coil will not generate dangerous high voltage when broken due to its hollow structure and low energy characteristics, and only signal loss will occur. Therefore, the breaking of the temperature fuse 7 will not cause dangerous high voltage, which is relatively safe.

[0030] In some embodiments, the insulating layer is sleeved with a high-temperature resistant sleeve, which is made of glass fiber material with a temperature resistance of 400°C. The high-temperature resistant sleeve can ensure the wear resistance and flexibility of the product, and also has a heat insulation effect, which reduces the influence of temperature rise on the use precision of the Rogowski coil.

[0031] It is worth noting that the expansion coefficient of the silica gel insulating layer 4 is 2.5×10⁻ 4 / °C, and the expansion coefficient of the polyimide enameled wire is 1.7×10⁻ 5 / °C. In the assembly of the Rogowski coil, the coil winding adopts a spiral winding process, and a stretching allowance of 0.1% to 0.3% is reserved, so that the Rogowski coil can maintain the stability of the overall structure in a 200°C high-temperature environment.

[0032] It is easy to understand that the person skilled in the art can combine, split, recombine, etc. the embodiments of the present application on the basis of one or several embodiments provided by the present application to obtain other embodiments, and these embodiments do not exceed the protection scope of the present application.

Claims

1. A high temperature resistant Rogowski coil, characterized in that, The coil body comprises a coil framework, an inductive coil is wound outside the coil framework, a first shielding layer is arranged outside the inductive coil, an insulating layer is arranged outside the first shielding layer, the coil framework comprises a copper conductor, and a silica gel insulating outer skin is arranged outside the copper conductor.

2. The high temperature resistant Rogowski coil of claim 1, wherein, The inductive coil is a polyimide enameled wire.

3. The high temperature resistant Rogowski coil of claim 1, wherein, The first shielding layer comprises a cylindrical sleeve woven by tinned copper wires, and the cylindrical sleeve is used for wrapping the inductive coil.

4. The high temperature resistant Rogowski coil of claim 1, wherein, The insulating layer is a silica gel heat shrink tube.

5. The high temperature resistant Rogowski coil of claim 1, wherein, The lead wire comprises a wire, a second shielding layer is arranged outside the wire, and the second shielding layer is electrically connected with the first shielding layer.

6. The high temperature resistant Rogowski coil of claim 1, wherein, A temperature fuse is connected in series at the lead wire, and the temperature fuse is arranged in the joint.

7. The high temperature resistant Rogowski coil of claim 1, wherein, A high-temperature-resistant sleeve is arranged outside the insulating layer.

Images