Mutual inductor for intelligent controller

Abstract

The utility model discloses a mutual inductor for an intelligent controller, which comprises a shell, a heat insulation layer, a hollow coil and a quick saturation coil, the heat insulation layer, the hollow coil and the quick saturation coil are respectively arranged in the shell, and the heat insulation layer is arranged between the hollow coil and the quick saturation coil. According to the utility model, by arranging the heat insulation layer, the temperature transfer between the rapid saturation coil and the hollow coil can be effectively isolated, the temperature influence of the rapid saturation coil on the hollow coil is reduced, and the temperature rise is reduced, so that the sampling precision of the mutual inductor is improved; the structure of the rapid saturation coil can give full play to material characteristics, so that after the rapid saturation coil achieves certain output, the output current does not continue to rise, and the temperature is ensured not to rise all the time; through the configuration of the rapid saturation coil, the air gap is prevented from influencing the energy output of the coil, so that the rapid saturation coil can provide greater energy supply.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electronic device technical field, especially relate to a mutual inductor for intelligent controller. BACKGROUND

[0002] At present, the current sensor of the intelligent controller used as the core control unit of the universal low-voltage circuit breaker is composed of two parts as shown in the figure, one is the speed saturation coil for providing energy, which is composed of the coil wound on the iron core with air gap, and the other is the hollow mutual inductor wound on the plastic ring for collecting current signal. The obvious shortcomings are: first, the speed saturation iron core with air gap reduces the energy output of the speed saturation coil, and when the three-phase main circuit current is lower than 0.4 times, there is not enough energy to start the intelligent controller. Second, when the harmonics on the main circuit are serious, the speed saturation coil generates a lot of heat, and the high temperature rise will cause the deformation of the hollow mutual inductor, thereby affecting the sampling accuracy. Figure 3 The Chinese patent with publication number CN204857428U discloses a current transformer, which comprises a mutual inductor composed of a closed iron core and a winding, the mutual inductor is provided with two groups, i.e. a first mutual inductor and a second mutual inductor, the ratio of the number of turns of the secondary winding to the number of turns of the primary winding of the first mutual inductor is greater than the ratio of the number of turns of the secondary winding to the number of turns of the primary winding of the second mutual inductor, the first mutual inductor is connected to a comparison circuit, the second mutual inductor is connected to an amplification circuit, and the amplification circuit is connected to the comparison circuit. The device overcomes the problem of output distortion of the current transformer under low load, improves the measurement accuracy, and reduces the economic loss of the power grid. However, the patent does not specifically configure the coil iron core, which may have air gap, resulting in reduced coil energy output; at the same time, there is no technical means for processing the coil temperature rise and heat generation, which may cause the deformation of the mutual inductor, thereby affecting the sampling accuracy.

[0003] CONTENT OF THE UTILITY MODEL

[0004] To solve the above technical problems, the utility model provides a mutual inductor for intelligent controller.

[0005] The utility model is realized through the following technical schemes.

[0006] The utility model provides a mutual inductor for intelligent controller, including shell, heat insulation layer, hollow coil and speed saturation coil, heat insulation layer, hollow coil and speed saturation coil are installed in the shell respectively, heat insulation layer is installed between hollow coil and speed saturation coil.

[0007] Preferably, the shell is provided with a groove, and the speed saturation coil is installed in the groove of the shell.

[0008] Preferably, the shell is provided with a heat dissipation hole. ​

[0009] Preferably, a threaded stud is arranged on the shell.

[0010] Preferably, a through hole is arranged inside the shell, and the shell has a rectangular shape.

[0011] Preferably, the shape of the heat insulation layer is consistent with the inner cavity of the shell.

[0012] Preferably, the speed saturation coil comprises a core and an enameled wire, and the enameled wire is wound on the core.

[0013] Preferably, the core of the speed saturation coil has a winding material thickness of 0.05-0.3mm, the core of the speed saturation coil is covered with a plastic layer, and the power frequency withstand voltage value of the speed saturation coil is 1000-3000V.

[0014] Preferably, the air core coil comprises a framework and an enameled wire, and the enameled wire is wound on the framework core.

[0015] Preferably, the heat insulation layer, the air core coil and the speed saturation coil are fixed in the shell by 704 glue.

[0016] The utility model discloses a mutual inductor has the advantages that:

[0017] 1. By setting up the heat insulation layer, can effectively isolate the temperature transmission between the speed saturation coil and the air core coil, reduce the temperature influence of the speed saturation coil to the air core coil, reduce the temperature rise, thereby improving the sampling precision of mutual inductor;

[0018] 2. The structure of the speed saturation coil can maximize the material properties, so that the output current of the speed saturation coil does not continue to rise after reaching a certain output, thereby ensuring that the temperature does not continue to rise;

[0019] 3. By configuring the speed saturation coil, the air gap is avoided to affect the coil energy output, so that the speed saturation coil can provide greater energy supply. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the whole structure schematic diagram of mutual inductor provided by the utility model embodiment;

[0021] Figure 2 It is the whole structure schematic diagram of mutual inductor provided by the utility model embodiment;

[0022] Figure 3 It is the whole structure schematic diagram of mutual inductor of prior art.

[0023] In the drawing: 1-shell, 2-heat insulation layer, 3-air core coil, 4-speed saturation coil, 5-heat dissipation hole, 6-through hole, 7-threaded stud. DETAILED DESCRIPTION

[0024] The technical scheme of the utility model is further described below, but the scope of protection is not limited to the description.

[0025] As shown in Figure 1 A mutual inductor for intelligent controller, comprising a shell 1, a heat insulation layer 2, a hollow coil 3 and a quick saturation coil 4, the heat insulation layer 2, the hollow coil 3 and the quick saturation coil 4 are installed in the shell 1 respectively, and the heat insulation layer 2 is installed between the hollow coil 3 and the quick saturation coil 4.

[0026] As shown in Figure 2 It is a mutual inductor split structure schematic diagram, according to the order of quick saturation coil 4, heat insulation layer 2 and hollow coil 3, in turn installed into the shell.

[0027] By setting heat insulation layer 2, the temperature transmission between quick saturation coil 4 and hollow coil 3 can be effectively isolated, the temperature influence of quick saturation coil 4 on hollow coil 3 is reduced, the temperature rise is reduced, thereby the sampling accuracy of mutual inductor is improved.

[0028] The shell 1 is provided with a recess, and the quick saturation coil 4 is installed in the recess of the shell 1.

[0029] The quick saturation coil 4 is installed in the recess, so that the stability of the quick saturation coil 4 is ensured.

[0030] The shell 1 is provided with a heat dissipation hole 5.

[0031] The heat dissipation hole 5 is beneficial to the internal temperature of the mutual inductor to dissipate outward during operation, and reduces the temperature change in the mutual inductor.

[0032] The shell 1 is provided with a stud 7.

[0033] The stud 7 is used for connecting screws, installing the upper cover of the shell and packaging the mutual inductor.

[0034] The shell 1 is provided with a through hole 6, and the two sides of the shell 1 are rectangular.

[0035] The through hole 6 and the two sides of the shell 1 are rectangular, which is used for matching the mutual inductor with other electronic components.

[0036] The shape of the heat insulation layer 2 is consistent with the inner cavity of the shell 1.

[0037] The shape of the heat insulation layer 2 is consistent with the inner cavity of the shell 1, so that the heat insulation layer 2 can enter the inner cavity of the shell 1 and be clamped without shaking. In the embodiment, the heat insulation layer uses FR4 glass fiber plate, which is cut and made.

[0038] The quick saturation coil 4 comprises a core and an enameled wire, and the enameled wire is wound on the core.

[0039] The number of turns of the coil of the enameled wire is determined according to the sampling range of the transformer, the output voltage reaches 16V when the through current reaches 0.2 times In, the coil can be wound in multiple layers, but the number of turns of each layer needs to be equal and uniformly distributed on the core.

[0040] The material thickness of the core of the fast saturation coil 4 is 0.05-0.3mm, the core of the fast saturation coil 4 is covered with a plastic layer, and the power frequency withstand voltage of the fast saturation coil 4 is 1000-3000V.

[0041] The fast saturation coil 4 is used to provide energy for the transformer.

[0042] In the embodiment, the core of the fast saturation coil is wound with permalloy or super microcrystalline material with a thickness of 0.15mm, and the core is covered with a plastic layer.

[0043] The structure of the fast saturation coil can maximize the material properties, so that after the fast saturation coil reaches a certain output, the output current will not continue to rise, thereby ensuring that the temperature will not continue to rise.

[0044] In the embodiment, the power frequency withstand voltage of the fast saturation coil 4 is 2000V.

[0045] The air core coil 3 comprises a skeleton and an enameled wire, and the enameled wire is wound on the skeleton core.

[0046] The air core coil 3 is used to collect current waveform signals. In the embodiment, the skeleton of the air core coil 3 is made of PTFE, i.e. polytetrafluoroethylene.

[0047] In the embodiment, the diameter specification of the enameled wire of the air core coil 3 is 0.15mm.

[0048] The heat insulation layer 2, the air core coil 3 and the fast saturation coil 4 are fixed in the shell 1 by 704 glue.

[0049] The 704 glue has good adhesion, high strength, excellent electrical insulation performance, sealing performance and aging resistance. By fixing the heat insulation layer 2, the air core coil 3 and the fast saturation coil 4 by the 704 glue, the transformer can be used for a long time in a large temperature range.

[0050] The heat insulation layer can effectively isolate the temperature transmission between the fast saturation coil and the air core coil, reduce the temperature influence of the fast saturation coil on the air core coil, and reduce the temperature rise, thereby improving the sampling accuracy of the transformer. The structure of the fast saturation coil can maximize the material properties, so that after the fast saturation coil reaches a certain output, the output current will not continue to rise, thereby ensuring that the temperature will not continue to rise. By configuring the fast saturation coil, the air gap is avoided to affect the energy output of the coil, so that the fast saturation coil can provide greater energy supply.

Claims

1. A transformer for a smart controller, characterized by, It comprises a shell (1), a heat insulation layer (2), a hollow coil (3) and a quick saturation coil (4), the heat insulation layer (2), the hollow coil (3) and the quick saturation coil (4) are respectively installed in the shell (1), and the heat insulation layer (2) is installed between the hollow coil (3) and the quick saturation coil (4).

2. The instrument transformer of claim 1, wherein, The shell (1) is provided with a groove, and the quick saturation coil (4) is installed in the groove of the shell (1).

3. The instrument transformer of claim 1, wherein, The shell (1) is provided with a heat dissipation hole (5).

4. The instrument transformer of claim 1, wherein, The shell (1) is provided with a stud (7).

5. The instrument transformer of claim 1, wherein, The shell (1) is provided with a through hole (6), and the shell (1) is rectangular in shape.

6. The instrument transformer of claim 1, wherein, The shape of the heat insulation layer (2) is consistent with the inner cavity of the shell (1).

7. The instrument transformer of claim 1, wherein, The quick saturation coil (4) comprises an iron core and an enameled wire, and the enameled wire is wound on the iron core.

8. The instrument transformer of claim 4, wherein, The thickness of the winding material of the iron core of the quick saturation coil (4) is 0.05-0.3mm, the iron core of the quick saturation coil (4) is covered with a plastic layer, and the power frequency withstand voltage value of the quick saturation coil (4) is 1000-3000V.

9. The instrument transformer of claim 1, wherein, The hollow coil (3) comprises a framework and an enameled wire, and the enameled wire is wound on the framework core.

10. The instrument transformer of claim 1, wherein, The heat insulation layer (2), the hollow coil (3) and the quick saturation coil (4) are fixed in the shell (1) by 704 glue.

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