Current mutual inductance device

Abstract

The utility model discloses a current mutual inductance device, which belongs to the technical field of new energy power generation, and is characterized in that iron cores are symmetrically arranged on two sides of a radiating fin, and the voltage at two ends of a coil is the same as that of a traditional current transformer by adopting a coil parallel connection mode. The number of turns of the windings on the iron core is one time that of the windings of a traditional current transformer, so that the section of the split symmetrically-arranged iron core is half of the section of the iron core of the traditional current transformer, the total loss of two parallel coil secondary windings is reduced when enameled wires with the same wire diameter are adopted, heat productivity is reduced while energy is saved, and the service life of the current transformer is prolonged. The temperature of the iron core and the coil can be effectively reduced through air cooling of the cooling fins, and the problem that the equipment performance is reduced due to the fact that the temperature is too high in the operation process of a current traditional common current transformer is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a current mutual inductance device belongs to new energy power generation technical field. BACKGROUND

[0002] The power equipment generally exists heating and temperature excessively high problem in the operation process, and high temperature can accelerate the aging of the insulating material of electric appliance coil and lead wire, even causes insulation breakdown, and further causes short circuit fault, the aging of the insulating material can reduce its insulation performance, increases the risk of electrical equipment leakage or short circuit, and the temperature of distribution cabinet is too high and can also cause fire and other safety accidents, which causes great threat to personnel and property.

[0003] The current market traditional ordinary current transformer also has the problem of excessively high operating temperature, and the current transformer cannot be stably operated for a long time in a high-temperature environment, if there is a metal support or other conductive medium around the current transformer in a high-temperature environment, the sinusoidal varying current passing through the generator outlet bus will cause an alternating magnetic field, the alternating magnetic field penetrates into the metal support to induce an electromotive force, thereby generating eddy current, the eddy current generates a magnetic field in the conductive medium, and mainly dissipates in the form of heat, causing the core to heat, thereby affecting the output accuracy of the transformer, and the long-term high-temperature environment of the core may cause a certain degree of change in the internal atomic structure, thereby changing the performance indicators such as magnetic permeability. SUMMARY

[0004] The utility model discloses a current mutual inductance device, through the form of split core coil parallel connection, reduce the total loss of coil secondary winding, cooperate with the fin air cooling heat dissipation, can effectively reduce the temperature of core and coil, solve the current traditional ordinary current transformer in the process of operation temperature excessively high and then cause the equipment performance to decline the problem.

[0005] In order to achieve the above-mentioned purpose / solve the above-mentioned technical problems, the utility model is realized by the following technical scheme: a current mutual inductance device, comprising a support plate, a fin arranged on the support plate, a core symmetrically arranged on both sides of the fin, a coil secondary winding wound on the core and a secondary terminal lug piece;

[0006] The fin is connected with the core for conducting the heat of the core;

[0007] The coil secondary winding is connected in parallel with the secondary terminal lug piece;

[0008] The core and the coil secondary winding are wrapped with a protective sleeve;

[0009] The protective sleeve, the core and the fin are externally poured with an insulating thin layer, and the secondary terminal lug piece is arranged on the insulating thin layer.

[0010] Optionally, the support plate is further provided with a heat-conducting plate for conducting heat from the iron core to the heat-dissipating fins, one end of the heat-conducting plate being connected to or abutting against the iron core and the other end being connected to or abutting against the heat-dissipating fins, so that heat from the iron core is conducted to the heat-dissipating fins through the heat-conducting plate for heat dissipation.

[0011] Optionally, the heat-conducting plate comprises a plate body and a connecting arm, the plate body being connected to or abutting against the iron core and the connecting arm having one end fixedly connected to the plate body and the other end being connected to or abutting against the heat-dissipating fins.

[0012] Optionally, the plate body is arc-shaped, which is conducive to abutting against the iron core and increases the contact area between the plate body and the iron core.

[0013] Optionally, the heat-dissipating fins comprise a plurality of annular fin bodies, the annular fin bodies being fixedly connected to the support plate and gaps being formed between the annular fin bodies, so that heat is prevented from accumulating between the annular fin bodies and the air cooling effect is improved.

[0014] Optionally, a plurality of heat-conducting fins are arranged in the gaps between the annular fin bodies for conducting heat between the annular fin bodies, so that heat is prevented from accumulating on one side of the heat-dissipating fins and the heat-dissipating effect is improved.

[0015] Optionally, a plurality of ventilation grooves are arranged on the annular fin bodies and distributed along the arc direction, which is conducive to air circulation and removal of heat from the annular fin bodies.

[0016] Optionally, the ventilation grooves are connected to the inner circle of the annular fin bodies, so that the contact area between the annular fin bodies and the air is increased.

[0017] Optionally, the annular fin bodies are provided with a plurality of vertical fins for mounting the iron core and conducting heat from the secondary winding of the coil to the annular fin bodies.

[0018] Optionally, the surface of the vertical fins is provided with anti-pulling square grooves for keeping the iron core stable, which has an anti-pulling effect during pouring of the insulating thin layer and ensures that the iron core and the coil are firmly poured.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] The utility model discloses a core is symmetrically laid out on both sides of the radiating fin, and the connecting mode of the coil parallel connection makes the voltage of both ends of the coil same with the voltage of the traditional current transformer, and the turns of winding on the core is more than the turns of winding of the traditional current transformer by one time, so the section of the core of the split symmetry is half of the section of the traditional current transformer core, when the same wire diameter enameled wire is adopted, the total loss of two parallel coils secondary winding is reduced, the heat quantity is reduced in the energy -conserving, and the temperature of the core and the coil can be effectively reduced through the air cooling of the radiating fin, and the problem that the current performance of the traditional ordinary current transformer is reduced due to the excessively high temperature in the operation process is solved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the whole structure schematic diagram of a current mutual inductance device (not show protective sheath) provided by the utility model embodiment;

[0022] Figure 2 It is the whole structure schematic diagram of a current mutual inductance device (show protective sheath) provided by the utility model embodiment;

[0023] Figure 3 It is the structure schematic diagram of the radiating fin in the current mutual inductance device provided by the utility model embodiment;

[0024] Figure 4 It is the structure schematic diagram of the circular ring piece body in the current mutual inductance device provided by the utility model embodiment;

[0025] Figure 5 It is the front view structure schematic diagram of a current mutual inductance device provided by the utility model embodiment;

[0026] Figure 6 It is the structure schematic diagram of the heat conduction plate in the current mutual inductance device provided by the utility model embodiment.

[0027] In the drawing: 1, support plate;2, radiating fin;201, circular ring piece body;202, gap;203, heat conduction piece;204, ventilation groove;3, core;4, coil secondary winding;5, secondary terminal lug;6, heat conduction plate;601, plate body;602, connecting arm;7, protective sheath;8, insulating thin layer;9, electricity larceny prevention cover;10, vertical piece;11, square slot of preventing pulling. DETAILED DESCRIPTION

[0028] The utility model will be further described below in combination with the drawings. The following embodiments are only used for more clearly explaining the technical scheme of the utility model, and can not limit the protection scope of the utility model by this. EMBODIMENT

[0029] As Figure 1As shown, a current transformer includes a support plate 1, a heat sink 2 disposed on the support plate 1, an iron core 3 symmetrically disposed on both sides of the heat sink 2, a coil secondary winding 4 wound around the iron core 3, and a secondary terminal connecting piece 5.

[0030] The heat sink 2 is connected to the iron core 3, and the secondary winding 4 of the coil is connected in parallel to the secondary terminal piece 5. The support plate 1 is also provided with a heat-conducting plate 6 for transferring heat from the iron core 3 to the heat sink 2. One end of the heat-conducting plate 6 is connected to or attached to the iron core 3, and the other end is connected to or attached to the heat sink 2. Specifically:

[0031] The heat-conducting plate 6 includes a plate body 601 and a connecting arm 602. The plate body 601 is in contact with the surface of the iron core 3. In this embodiment, the plate body 601 is arc-shaped. The arc-shaped plate body 601 is conducive to contact with the iron core 3 and increases the contact area between the plate body 601 and the iron core 3. The top end of the connecting arm 602 is fixed to the bottom end of the plate body 601, and the bottom end extends to the support plate 1 and is connected to the side of the heat sink 2 through fasteners. The heat on the iron core 3 is transferred to the heat sink 2 through the heat-conducting plate 6 and dissipated by air cooling.

[0032] like Figure 2 As shown, the iron core 3 and the secondary winding 4 are wrapped with a protective sleeve 7. The protective sleeve 7, iron core 3, and heat sink 2 are covered with an insulating thin layer 8. The secondary terminal connecting piece 5 is mounted on the insulating thin layer 8. An anti-theft cover 9 is installed on the outside of the secondary terminal connecting piece 5. The anti-theft cover 9 is connected to the insulating thin layer 8 using lead-sealed screws. Specifically:

[0033] like Figure 5 As shown, multiple vertical plates 10 are fixed to the side of the annular plate 201 for mounting the iron core 3 and conducting heat from the secondary winding 4 of the coil to the annular plate 201. To ensure the iron core 3 is firmly cast to the coil, an anti-pull-out square groove 11 is provided on the side of the vertical plate 10 that contacts the secondary winding 4 of the coil. This groove has an anti-pull-out function during the casting of the insulating thin layer 8. In this example, the protective sleeve 7 is a glass fiber sleeve, which has high tensile strength, can withstand large external forces, and can resist the erosion of various chemicals, exhibiting excellent corrosion resistance. The insulating thin layer 8 is an epoxy resin casting layer. The protective sleeve 7 wraps the wound iron core 3 and the secondary winding, increasing the strength. Based on the protective sleeve 7, the epoxy resin insulating thin layer 8 is cast to integrate the protective sleeve 7, the iron core 3, and the side of the heat sink 2, which facilitates the transfer of heat from the secondary winding to the heat sink 2 through the insulating thin layer 8. Example

[0034] like Figure 1 As shown, a current transformer includes a support plate 1, a heat sink 2 disposed on the support plate 1, an iron core 3 symmetrically disposed on both sides of the heat sink 2, a coil secondary winding 4 wound around the iron core 3, and a secondary terminal connecting piece 5.

[0035] The heat sink 2 is connected with the iron core 3, the coil secondary winding 4 is connected in parallel with the secondary terminal lug 5, the iron core 3 on both sides of the heat sink 2 is the same, the connection mode of the coil in parallel makes the voltage at both ends of the coil same as the voltage of the traditional current transformer, the winding turns on the iron core 3 is one time more than the winding turns of the traditional current transformer, therefore, the cross section of the iron core 3 is half of the cross section of the traditional current transformer, when the same wire diameter enameled wire is adopted

[0036] The support plate 1 is further provided with a heat conduction plate 6 for conducting the heat of the iron core 3 to the heat sink 2, one end of the heat conduction plate 6 is connected with or attached to the iron core 3, and the other end is connected with or attached to the heat sink 2, and specifically:

[0037] As shown in Figure 5 and Figure 6 , the heat conduction plate 6 comprises a plate body 601 and a connecting arm 602, the plate body 601 is attached to the surface of the iron core 3, in this embodiment, the plate body 601 is arc-shaped, which is beneficial to be attached to the iron core 3 and increases the contact area between the plate body 601 and the iron core 3; the top end of the connecting arm 602 is fixedly connected with the bottom of the plate body 601, and the bottom end extends to the support plate 1 and is connected with the side surface of the heat sink 2 through a fastener, the heat on the iron core 3 is transmitted to the heat sink 2 through the heat conduction plate 6 and is dissipated by air cooling.

[0038] As shown in Figure 3 , the heat sink 2 comprises a plurality of circular ring plate bodies 201, in this example, the number of the circular ring plate bodies 201 is two, the two circular ring plate bodies 201 are coaxially fixedly connected in the middle of the support plate 1, and the circular ring plate bodies 201 have a gap 202 therebetween, the gap 202 avoids the accumulation of heat between the circular ring plate bodies 201 and improves the air cooling effect;

[0039] A plurality of heat conduction plates 203 are further arranged in the gap 202 of the circular ring plate body 201, the two ends of the heat conduction plate 203 are fixedly connected with the circular ring plate bodies 201 on both sides, which is beneficial to the conduction of heat between the circular ring plate bodies 201 and avoids the accumulation of heat on one side of the heat sink 2, thereby improving the heat dissipation effect;

[0040] As shown in Figure 4 , in order to enhance the air circulation between the circular ring plate bodies 201, a plurality of ventilation grooves 204 are arranged on the circular ring plate body 201 and distributed along the circular arc direction, which facilitates the circulation of air and quickly removes the heat of the single circular ring plate body 201, in this example, the ventilation grooves 204 are communicated with the inner circle of the circular ring plate body 201, thereby improving the contact area between the circular ring plate body 201 and the air.

[0041] As shown in Figure 2As shown, the iron core 3 and the coil secondary winding 4 are wrapped with a protective sleeve 7, the protective sleeve 7, the iron core 3 and the heat sink 2 are externally poured with an insulating thin layer 8, the secondary terminal lug 5 is installed on the insulating thin layer 8, the secondary terminal lug 5 is externally provided with an electricity larceny prevention cover 9, the electricity larceny prevention cover 9 is connected with the insulating thin layer 8 through lead sealing screws, and specifically:

[0042] The circular ring sheet body 201 is fixed with a plurality of vertical sheets 10 for mounting the iron core 3 and conducting heat of the coil secondary winding 4 to the circular ring sheet body 201, in order to pour the iron core 3 and the coil firmly, the vertical sheet 10 is provided with an anti-removal square groove 11 on the side in contact with the coil secondary winding 4, which has an anti-removal effect in the process of pouring the insulating thin layer 8, in the example, the protective sleeve 7 is a glass fiber sleeve, which has high tensile strength, can withstand large external force, can resist the corrosion of various chemicals, has excellent corrosion resistance, the insulating thin layer 8 is an epoxy resin pouring layer, the wound iron core 3 and the secondary winding are wrapped through the protective sleeve 7, the strength is increased, on the basis of the protective sleeve 7, the protective sleeve 7, the iron core 3 and the heat sink 2 are poured into one body through the pouring mode of the epoxy resin insulating thin layer 8, which is beneficial to transferring the heat of the secondary winding to the heat sink 2 through the insulating thin layer 8.

[0043] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0044] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] The above is only the preferred embodiment of the present application, it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A current transformer arrangement, characterized by The utility model relates to a kind of heat dissipation transformer, including support plate (1), be located on the fin (2) of support plate (1), the iron core (3) of symmetry is located on both sides of fin (2), the coil secondary winding (4) and secondary terminal tab (5) of winding in iron core (3); The fin (2) is connected with the iron core (3), for conducting the heat of iron core (3); The coil secondary winding (4) is connected in parallel to the secondary terminal tab (5); The iron core (3) and coil secondary winding (4) are wrapped with protective sleeve (7); The protective sleeve (7), iron core (3) and fin (2) are externally poured with insulation thin layer (8), and the secondary terminal tab (5) is arranged in insulation thin layer (8).

2. The current transformer arrangement of claim 1, characterized in that The support plate (1) is further provided with heat conduction plate (6) for conducting the heat of iron core (3) to fin (2), one end of heat conduction plate (6) is connected with or adhered to iron core (3), and the other end is connected with or adhered to fin (2).

3. The current transformer arrangement of claim 2, wherein, The heat conduction plate (6) includes plate body (601) and connecting arm (602);The plate body (601) is connected with or adhered to the iron core (3), and one end of the connecting arm (602) is fixedly connected with the plate body (601), and the other end is connected with or adhered to the fin (2).

4. The current transformer arrangement of claim 3, wherein, The plate body (601) is arc-shaped.

5. The current transformer arrangement of claim 1, wherein, The fin (2) includes a plurality of annular sheet bodies (201), the annular sheet bodies (201) are fixedly connected with the support plate (1), and the annular sheet bodies (201) have gaps (202) therebetween.

6. The current transformer arrangement of claim 5, wherein, A plurality of heat conduction sheets (203) for conducting heat between the annular sheet bodies (201) are further arranged in the gaps (202) of the annular sheet bodies (201).

7. The current transformer arrangement of claim 5 or 6, characterized in that A plurality of ventilation grooves (204) distributed along the direction of circular arc are further arranged on the annular sheet bodies (201).

8. The current transformer arrangement of claim 7, wherein, The ventilation grooves (204) are connected with the inner circle of the annular.

9. The current transformer arrangement of claim 5, wherein, The annular sheet bodies (201) are provided with a plurality of vertical sheets (10) for mounting the iron core (3) and conducting the heat of the coil secondary winding (4) to the annular sheet bodies (201).

10. The current transformer arrangement of claim 9, wherein, The surface of the vertical sheet (10) is provided with a square slot (11) for keeping the iron core (3) stable.

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