CN211654559U

CN211654559U - Current transformer with direct current component resisting function

Info

Publication number: CN211654559U
Application number: CN202020073655.2U
Authority: CN
Inventors: 曾琴; 杨博
Original assignee: Shenzhen Zhicheng Electric Measurement Technology Co ltd
Current assignee: Shenzhen Zhicheng Electric Measurement Technology Co ltd
Priority date: 2020-01-14
Filing date: 2020-01-14
Publication date: 2020-10-09
Anticipated expiration: 2030-01-14

Abstract

The utility model discloses a current transformer with direct current component resisting function, which comprises an annular closed iron core, a coil, a first insulating pouring layer, a second insulating pouring layer and a plurality of heat conducting components; the coil is wound on the annular closed iron core, the first insulation pouring layer is poured on the inner ring wall surface formed by winding the annular closed iron core, and the second insulation pouring layer is poured on the outer ring wall surface formed by winding the annular closed iron core; the heat conduction assembly is used for guiding out heat generated by the annular closed iron core. The utility model discloses combine together heat pipe heat transfer technique and current transformer, the effectual solution is at insulating pouring, under the condition of low radiating effect, the effectual radiating effect who improves current transformer.

Description

Current transformer with direct current component resisting function

Technical Field

The utility model relates to a current transformer technical field, concretely relates to current transformer with anti direct current component function.

Background

The current transformer principle is based on the electromagnetic induction principle. The current transformer is composed of a closed iron core and a winding. The primary winding of the current transformer has few turns and is connected in series in a circuit of current to be measured, so that all current of the circuit always flows through the current transformer, the secondary winding has more turns and is connected in series in a measuring instrument and a protection circuit, and the secondary circuit of the current transformer is always closed when the current transformer works, so that the impedance of a series coil of the measuring instrument and the protection circuit is very small, and the working state of the current transformer is close to short circuit.

The transformer is also called as instrument transformer, which is a general name of current transformer and voltage transformer, can change high voltage into low voltage, and large current into small current, and is used for measuring or protecting system, its function is mainly to convert high voltage or large current into standard low voltage (100V) or standard small current (5A or 1A, both referring to rated value) in proportion, so as to realize standardization and miniaturization of measuring instrument, protecting equipment and automatic control equipment, and the transformer can also be used to separate high voltage system, so as to ensure the safety of human body and equipment.

The current transformer is a device which can convert high alternating current into low current which is easy to control, and has the characteristics of excellent performance and stable precision; current transformer can produce more heat when using, and current transformer's radiating effect is poor, so can cause certain damage to low pressure current transformer for a long time, and the practicality is relatively poor.

Especially, the current transformer needs insulation casting, and the thermal conductivity of its insulation casting layer is lower, and traditional heat dissipation mode is like: the fin type heat exchange is difficult to achieve good heat dissipation effect; therefore, the heat exchange effect of the current transformer is poor, and heat is not easy to dissipate in a working state of long-term use, so that the current transformer breaks down.

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model provides a current transformer with anti direct current component function solves the poor problem of current transformer heat dissipation.

A current transformer with a direct-current component resisting function comprises an annular closed iron core, a coil, a first insulating pouring layer, a second insulating pouring layer and a plurality of heat conducting assemblies; the coil is wound on the annular closed iron core, the first insulation pouring layer is poured on the inner ring wall surface formed by winding the annular closed iron core, and the second insulation pouring layer is poured on the outer ring wall surface formed by winding the annular closed iron core; the heat conduction assembly is arranged on the side of the first insulation pouring layer, the heat conduction assembly is fixedly connected with the annular closed iron core in a contact mode, one end of the heat conduction assembly penetrates through the first insulation pouring layer, the end portion of the heat conduction assembly is exposed in the air, and the heat conduction assembly is used for guiding out heat generated by the annular closed iron core.

Preferably, the heat conducting assembly comprises a heat pipe, a fixing piece, an insulating sealing ring and an insulating conductive medium, wherein the fixing piece is fixedly arranged on the annular closed iron core and is in surface contact with a contact surface of the annular closed iron core and the fixing piece; the fixing piece is provided with an annular blind hole, and the insulating sealing ring is arranged in the annular blind hole; the heat pipe comprises a first end part and a second end part, the first end part is arranged in the annular blind hole, and the second end part is a free end; the insulating seal ring is sleeved on the outer ring wall surface of the first end portion, an accommodating space is arranged between the first end portion and the bottom of the annular blind hole, and insulating conductive media with insulating characteristics are accommodated in the accommodating space.

Preferably, the insulating and conducting medium is silicone oil.

Preferably, the insulating sealing ring is made of rubber materials.

Preferably, the first insulating casting layer and the second insulating casting layer are both cast with epoxy resin.

Preferably, the fixing member is provided integrally with the annular closed core.

Preferably, the heat pipe passes through the first insulating casting layer, and the second end is exposed to the air.

Preferably, the heat conducting component is further disposed on the second insulating casting layer side, the heat pipe penetrates through the second insulating casting layer, and the second end is exposed to the air.

Preferably, the current transformer further comprises a mounting seat, the mounting seat is arranged at the bottom of the annular closed iron core, a mounting hole is further formed in the mounting seat, and the mounting seat is used for bearing the annular closed iron core, the coil, the first insulation pouring layer, the second insulation pouring layer and the plurality of heat conduction assemblies and fixing the current transformer on the mounting position.

The beneficial effects of the utility model are embodied in: the annular closed iron core generates heat, however, the insulating pouring layer can block the heat dissipation; therefore, the annular closed iron core is connected with the heat conducting assembly, heat of the annular closed iron core is led out in time, and the obstruction of an insulating pouring layer to heat dissipation of the annular closed iron core is avoided. The heat pipe heat exchange technology is combined with the current transformer, so that the heat dissipation effect of the current transformer is effectively improved under the conditions of insulation pouring and low heat dissipation effect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic view of a first structure of a current transformer according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structural view of a heat conducting assembly according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a heat conducting assembly according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a second structure of the current transformer provided by the embodiment of the present invention.

In the drawing, 10-annular closed iron core, 101-coil, 102-first insulation casting layer, 103-second insulation casting layer, 104-mounting seat, 105-mounting hole, 20-heat conducting component, 201-heat pipe, 2011-second end, 202-fixing piece, 2012-first end, 203-insulation sealing ring and 200-accommodating space.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

As shown in fig. 1, the present invention provides a current transformer with dc component resistance, which includes an annular closed iron core 10, a coil 101, a first insulating casting layer 102, a second insulating casting layer 103, and a plurality of heat conducting components 20; the coil 101 is wound on the annular closed iron core 10, the first insulation casting layer 102 is cast on the inner ring wall surface formed by winding the annular closed iron core 10, and the second insulation casting layer 103 is cast on the outer ring wall surface formed by winding the annular closed iron core 10.

The heat conducting assembly 20 is disposed on the first insulating casting layer 102 side, the heat conducting assembly 20 is fixedly connected to the annular closed iron core 10 in a contact manner, one end of the heat conducting assembly 20 penetrates through the first insulating casting layer 102, an end of the heat conducting assembly 20 is exposed in the air, and the heat conducting assembly 20 is configured to conduct out heat generated by the annular closed iron core 10.

As shown in fig. 2 and 3, the heat conducting assembly 20 includes a heat pipe 201, a fixing member 202, an insulating sealing ring 203, and an insulating conductive medium, wherein the fixing member 202 is fixedly disposed on the annular closed iron core 10, and is in surface contact with a contact surface of the annular closed iron core 10 and the fixing member 202; alternatively, the fixing member 202 is integrally provided with the annular closed core 10.

The fixing member 202 has an annular blind hole, and the insulating sealing ring 203 is disposed in the annular blind hole; the heat pipe 201 includes a first end 2012 and a second end 2011, the first end 2012 is disposed in the annular blind hole, and the second end 2011 is a free end; the insulating sealing ring 203 is sleeved on the outer ring wall surface of the first end portion 2012, an accommodating space 200 is provided between the first end portion 2012 and the bottom of the annular blind hole, and the accommodating space 200 is used for accommodating an insulating conductive medium with insulating property, as shown in fig. 3. Wherein, the insulating conductive medium is silicone oil. The insulating seal ring 203 is made of rubber material.

Further, the heat pipe 201 passes through the first insulating casting layer 102, and the second end 2011 is exposed to the air. It should be noted that the purpose of exposing the second end 2011 to the air is to conduct the heat generated by the annular closed core 10 to the air, so that the heat pipe 201 is the main heat transfer path, thereby improving the heat dissipation efficiency of the current transformer.

Still further, as shown in fig. 4, the heat conducting assembly 20 is further disposed on the side of the second insulating casting layer 103, the heat pipe 201 penetrates through the second insulating casting layer 103, and the second end 2011 is exposed to the air.

Further, the first insulating casting layer 102 and the second insulating casting layer 103 are both cast with epoxy resin.

Further, the current transformer further comprises a mounting seat 104, the mounting seat 104 is arranged at the bottom of the annular closed iron core 10, a mounting hole 105 is further formed in the mounting seat 104, and the mounting seat 104 is used for bearing the annular closed iron core 10, the coil 101, the first insulating pouring layer 102, the second insulating pouring layer 103 and the plurality of heat conducting assemblies 20 and fixing the current transformer on a mounting position.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. The utility model provides a current transformer with anti direct current component function which characterized in that: the coil comprises an annular closed iron core, a coil, a first insulation pouring layer, a second insulation pouring layer and a plurality of heat conduction assemblies; the coil is wound on the annular closed iron core, the first insulation pouring layer is poured on the inner ring wall surface formed by winding the annular closed iron core, and the second insulation pouring layer is poured on the outer ring wall surface formed by winding the annular closed iron core; the heat conduction assembly is arranged on the side of the first insulation pouring layer, the heat conduction assembly is fixedly connected with the annular closed iron core in a contact mode, one end of the heat conduction assembly penetrates through the first insulation pouring layer, the end portion of the heat conduction assembly is exposed in the air, and the heat conduction assembly is used for guiding out heat generated by the annular closed iron core.

2. The current transformer with the function of resisting the direct current component according to claim 1, characterized in that: the heat conducting assembly comprises a heat pipe, a fixing piece, an insulating sealing ring and an insulating conductive medium, wherein the fixing piece is fixedly arranged on the annular closed iron core and is in surface contact with a contact surface of the annular closed iron core and the fixing piece; the fixing piece is provided with an annular blind hole, and the insulating sealing ring is arranged in the annular blind hole; the heat pipe comprises a first end part and a second end part, the first end part is arranged in the annular blind hole, and the second end part is a free end; the insulating seal ring is sleeved on the outer ring wall surface of the first end portion, an accommodating space is arranged between the first end portion and the bottom of the annular blind hole, and insulating conductive media with insulating characteristics are accommodated in the accommodating space.

3. The current transformer with the function of resisting the direct current component as claimed in claim 2, wherein: the insulating conductive medium is silicone oil.

4. The current transformer with the function of resisting the direct current component as claimed in claim 2, wherein: the insulating seal ring is made of rubber materials.

5. The current transformer with the function of resisting the direct current component according to claim 1, characterized in that: the first insulating pouring layer and the second insulating pouring layer are both poured by epoxy resin.

6. The current transformer with the function of resisting the direct current component as claimed in claim 2, wherein: the fixing piece and the annular closed iron core are integrally arranged.

7. The current transformer with the function of resisting the direct current component as claimed in claim 2, wherein: the heat pipe passes through the first insulating casting layer, and the second end is exposed to the air.

8. The current transformer with the function of resisting the direct current component as claimed in claim 2, wherein: the heat conduction assembly is further arranged on the side of the second insulating pouring layer, the heat pipe penetrates through the second insulating pouring layer, and the second end portion is exposed to the air.

9. The current transformer with the function of resisting the direct current component according to claim 1, characterized in that: the current transformer further comprises a mounting seat, the mounting seat is arranged at the bottom of the annular closed iron core, mounting holes are further formed in the mounting seat, and the mounting seat is used for bearing the annular closed iron core, the coil, the first insulation pouring layer, the second insulation pouring layer and the plurality of heat conducting assemblies and fixing the current transformer on the mounting position.