CN214175801U

CN214175801U - Current transformer

Info

Publication number: CN214175801U
Application number: CN202023233323.5U
Authority: CN
Inventors: 杨伟; 高洪良; 刘双
Original assignee: Ningbo BYD Semiconductor Co Ltd; BYD Semiconductor Co Ltd
Current assignee: Ningbo BYD Semiconductor Co Ltd; BYD Semiconductor Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-09-10
Anticipated expiration: 2030-12-28

Abstract

The application discloses current transformer, including coil induction part, coil induction part includes: the device comprises a first shell, a second shell and an opening and closing assembly; the first shell and the second shell are connected in an opening and closing mode through a connecting assembly, and the opening and closing assembly is used for adjusting the opening and closing states of the first shell and the second shell; be provided with first coil assembly in the first casing, be provided with second coil assembly in the second casing, first coil assembly and second coil assembly include two at least wire windings respectively. The current transformer has the advantages of being simple in structure, suitable for detecting currents in different ranges, and safe and convenient to use.

Description

Current transformer

Technical Field

The utility model relates to a technical field of electric power unit, concretely relates to current transformer.

Background

The current transformer is an instrument for converting a large primary side current into a small secondary side current according to the electromagnetic induction principle to measure, consists of a closed iron core and a winding, and has the function of converting a primary current with a larger value into a secondary current with a smaller value through a certain transformation ratio for protection, measurement and other purposes.

The secondary winding coil turns of the existing current transformer are fixed, multi-range measurement cannot be achieved, and meanwhile, a closed iron core of the transformer is not suitable for later-stage installation and use of the transformer, and therefore the current transformer is inconvenient to use.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned drawbacks or deficiencies in the prior art, it is desirable to provide a current transformer that is simple in structure, easy to install and disassemble, achieves multi-range measurement, and facilitates use of the transformer.

In a first aspect, the present invention provides a current transformer, including coil induction part, coil induction part includes: the device comprises a first shell, a second shell and an opening and closing assembly;

the first shell and the second shell are connected in an opening and closing mode through a connecting assembly, and the opening and closing assembly is used for adjusting the opening and closing states of the first shell and the second shell;

be provided with first coil assembly in the first casing, be provided with second coil assembly in the second casing, first coil assembly and second coil assembly include two at least wire windings respectively.

Alternatively, the connecting assembly includes a rotating shaft for connecting the first housing and the second housing.

Optionally, the connecting assembly further includes an elastic member, and the elastic member is connected to the first housing and the second housing respectively, and is configured to provide a restoring force for keeping the first housing and the second housing closed with each other.

As an optional scheme, the elastic part comprises a torsion spring, the torsion spring is sleeved on the rotating shaft, one end of the torsion spring is fixed on the first shell, and the other end of the torsion spring is fixed on the second shell.

As an optional scheme, the opening and closing assembly comprises an opening and closing piece and an assembling hole matched with the opening and closing piece;

the assembling hole is formed in a side wall, facing the outside, of one end of the first shell or the second shell;

after the opening and closing piece is inserted into the assembling hole and the opening and closing piece is subjected to certain pressure, the first shell and the second shell are in an opening state, and after the pressure of the opening and closing piece is released, the first shell and the second shell are in a closing state.

As an optional scheme, the coil induction part further comprises a locking structure, the locking structure comprises a locking hole and a locking pin, and the locking hole is formed in one end of the first shell or one end of the second shell;

after the first shell and the second shell are opened to a preset angle, the locking pin passes through the locking hole, and the position of the first shell or the second shell is locked.

As an optional scheme, the first casing and the second casing are respectively covered with a cover body, and the cover bodies are used for respectively fixing the first coil assembly and the second coil assembly.

As an optional scheme, the first coil assembly and the second coil assembly respectively include a magnetic core, the magnetic core is externally wrapped with an insulating shell, the outer wall of the insulating shell is wound with at least two wire windings along the extending direction of the insulating shell, and the two adjacent wire windings are connected in parallel or in series through a controllable switch.

Alternatively, the outer wall of the insulating shell is provided with rounded corners.

Optionally, the coil induction part further comprises a fixed shell and a PCBA board;

the fixed shell is fixedly connected with one end of the rotating shaft;

on the PCBA board was fixed in the set casing, be provided with two at least binding post on the PCBA board, binding post and wire winding are connected.

Optionally, the transformer further comprises an electrical processing part, the electrical processing part comprises a main body, the main body is fixedly connected with the fixed shell, one end of the main body is provided with an elastic probe, and the elastic probe is electrically connected with the PCBA.

The current transformer can adapt to cables of different specifications through the opening and closing connection of the first shell and the second shell, is convenient to use, and can prevent the first shell and the second shell from being opened randomly through adjusting the opening and closing states of the first shell and the second shell through the opening and closing assembly, so that the use safety of products is guaranteed; and at least two wire windings are arranged on the first coil component and the second coil component, so that the current transformer can detect currents with different ranges, and the use is convenient.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 is a schematic structural diagram of a current transformer according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a current transformer in an open state according to an embodiment of the present invention;

fig. 3 is an exploded schematic view of a current transformer according to an embodiment of the present invention (not shown in the figure is a wire winding);

fig. 4 is a cross-sectional view of a current transformer according to an embodiment of the present invention in a closed state;

fig. 5 is a cross-sectional view of a current transformer according to an embodiment of the present invention in an open state;

fig. 6 is a schematic structural diagram of a connection assembly of a current transformer according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a first housing of a current transformer according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a second housing of a current transformer according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a current transformer according to an embodiment of the present invention after a first casing and a second casing are connected;

fig. 10 is a schematic structural diagram of a cover of a current transformer according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a PCBA board of a current transformer according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a fixing shell of a current transformer according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of an electrical processing portion of a current transformer according to an embodiment of the present invention.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

An embodiment of the present application provides a current transformer, as shown in fig. 1 to 5, including:

a coil induction section 100, the coil induction section 100 comprising: a first housing 110, a second housing 120, and an opening and closing assembly 130;

the first shell 110 and the second shell 120 are connected by a connecting assembly 140 in an opening and closing manner, and the opening and closing assembly 130 is used for adjusting the opening and closing states of the first shell 110 and the second shell 120;

a first coil assembly 111 is disposed in the first casing 110, a second coil assembly 121 is disposed in the second casing 120, and the first coil assembly 111 and the second coil assembly 121 respectively include at least two wire windings.

It should be noted that the first housing 110 and the second housing 120 may be any insulating material.

The first shell 110 and the second shell 120 are connected in an opening and closing manner through a connecting assembly 130, and the connecting assembly 130 facilitates the opening and closing of the first shell 110 and the second shell 120; the connecting component 130 may be, but is not limited to, a rotating shaft or a hinge, and the like, which is not limited in this embodiment of the application.

When the first housing 110 and the second housing 120 are in a buckled state, an accommodating space is defined between the first housing 110 and the second housing 120, and is used for accommodating a conductor to be tested, the conductor to be tested is electrified, and the first coil component 111 and the second coil component 121 form an electromagnetic induction loop.

The first housing 110 and the second housing 120 may be, but not limited to, circular arc, rectangular, trapezoidal, etc., as long as the first housing 110 and the second housing 120 are in a locked state, and the first coil assembly 111 and the second coil assembly 121 can form an electromagnetic induction loop.

In a specific embodiment, as shown in the drawing, the first casing 110 and the second casing 120 are both semi-circular, the first casing 110 and the second casing are buckled together to form a cavity c1 and a through hole c5, respectively, the cavity c1 is used for accommodating the first coil assembly 111 and the second coil assembly 121, the through hole c5 is used for a conductor to be tested to pass through, the conductor to be tested is electrified, and the first coil assembly 111 and the second coil assembly 121 form an electromagnetic induction loop.

The opening and closing assembly 130 is used for adjusting the opening and closing states of the first shell 110 and the second shell 120, and can effectively prevent the first shell 110 and the second shell 120 from being opened at will, so that the use safety of the product is ensured. It is understood that the opening and closing assembly 130 may be any configuration of lock and key that mates with the lock.

The first coil component 111 and the second coil component 121 may respectively include at least two wire windings, that is, the first coil component 111 may include two wire windings, three wire windings, and more than three wire windings; the second coil assembly 121 may include two wire windings, three wire windings, and more than three wire windings.

The number of turns of the coil of each wire winding can be the same or different; the winding directions can be the same or different;

the plurality of wire windings can be connected in series or in parallel.

The plurality of wire windings of the embodiment are beneficial to changing the number of turns of the coil, and further beneficial to that the same current transformer can be used for measuring different current ranges, for example, 300A current is respectively converted into 10A, 5A or 2A and the like.

The current transformer provided by the embodiment of the application can adapt to cables of different specifications through the opening and closing connection of the first shell and the second shell, is convenient to use, and can prevent the first shell and the second shell from being opened randomly through adjusting the opening and closing states of the first shell and the second shell through the opening and closing assembly, so that the use safety of a product is guaranteed; and through set up two at least wire windings on first coil pack and second coil pack, be favorable to realizing that current transformer detects the electric current of different ranges, can detect the electric current of different ranges, adaptability is wide, facilitates the use.

As an implementable manner, as shown in fig. 6, the connection assembly 140 includes a rotation shaft 141, and the rotation shaft 141 is used to connect the first casing 110 and the second casing 120. The first casing 110 and the second casing 120 are connected through the rotating shaft, the structure is simple, the opening and closing between the first casing 110 and the second casing 120 are effectively realized through the rotation of the rotating shaft, and the device is labor-saving and convenient to use.

As an implementation manner, the connection assembly 140 further includes a resilient member 142, and the resilient member 142 is connected to the first housing 110 and the second housing 120 respectively, for providing a restoring force for keeping the first housing 110 and the second housing 120 closed with each other. The elastic member 142 in this embodiment is provided with and is favorable to the first casing 110 and the second casing 120 to realize automatic closing and resetting, so that when the mutual inductor is not used, the first casing 110 and the second casing 120 are closed, and the mutual inductor is convenient to store.

The elastic member 142 may be, but not limited to, various springs or torsion springs, which is not limited in this embodiment.

In a preferred embodiment, the elastic member 142 is a torsion spring, and the torsion spring is sleeved on the rotating shaft 141. The torsion spring can generate a torque or a rotational force compared to a general spring, and is advantageous to open and close the first and

second housings

110 and 120 and to automatically return.

In a specific embodiment, as shown in fig. 6-9, a hole b1 is formed at one end of the first housing 110, a hole d1 and a hole d2 are respectively formed at one end of the second housing 120, the rotating shaft 141 passes through the holes d1, the holes d2 and the holes b1 to connect the first housing 110 with the second housing 120, a hole b2 is further formed at one end of the first housing 110, a hole d3 is further formed at one end of the second housing 120, the torsion spring is sleeved on the rotating shaft 141, the e1 end of the torsion spring is designed to be a 90-degree corner and is used for being matched with the hole b2 of the first housing 110 and fixing the e1 end of the torsion spring, and the e2 end of the torsion spring is matched with the hole d3 of the second housing 120 to fix the e2 end of the torsion spring, so that the first housing 110 is connected with the second housing 120 in an opening and closing manner.

As an implementation manner, as shown in fig. 2 and 3, the opening and closing assembly 130 includes an opening member 131 and a fitting hole 132 matched with the opening member 131;

the fitting hole 132 is formed in a side wall of the first casing 110 or the second casing 120, the side wall facing outward;

after the opening element 131 is inserted into the assembly hole 132 and the opening element 131 is pressed to a certain degree, the first casing 110 and the second casing 120 are in an open state, and after the pressure of the opening element 131 is released, the first casing 110 and the second casing 120 are in a closed state.

In this embodiment, the opening member 131 is matched with the assembling hole 132, which is beneficial to ensuring that the first casing 110 and the second casing 120 are not opened arbitrarily, and the opening member 131 matched with the assembling hole 132 can be opened only for a specific special user, thereby further realizing the use safety of the product.

The opening member 131 may have a shape of a cylinder, a cube, a triangular prism, or the like, and correspondingly, the assembly hole 132 may be a circular hole, a rectangular hole, a triangular hole, or the like; this embodiment is not particularly limited to this.

It should be noted that one of the first housing 110 and the second housing 120 serves as a fixed module, and the other serves as a rotating module, and the rotating module rotates with respect to the fixed module under the action of the connecting assembly 140, so as to realize the opening and closing between the first housing 110 and the second housing 120.

It is understood that when the first housing 110 is used as a rotating module, the second housing 120 is used as a fixed module; similarly, when the first housing 110 is used as a fixed module, the second housing 120 is used as a rotating module. The opening/closing component 130 mainly applies force to the rotating module, so as to control the opening/closing state of the first casing 110 and the second casing 120.

Illustratively, as shown in fig. 2, 4 or 5, the first housing 110 is a fixed module, the second housing 120 is a rotating module, the assembling hole 132 is opened at one end of the second housing 120, the opening element 131 is inserted into the assembling hole 132, a certain pressure is applied to the opening element 131, the second housing 120 rotates around the rotating shaft 141, the first housing 110 and the second housing 120 are in an open state (fig. 2 or 5), after the pressure of the opening element 131 is released, the first housing 110 is reset due to the action of the torsion spring, and the first housing 110 and the second housing 120 are in a closed state. Here, since the torsion arm of the torsion spring is short, a large force is required to open the torsion arm, which is advantageous for ensuring the closed state of the product (fig. 4), and when the opening and closing member 131 is pulled out from the fitting hole 132, the first and

second housings

110 and 120 cannot be opened.

In a specific embodiment, the cross section of the opening and closing member along the width direction is T-shaped, and the T-shaped structure has a certain strength, so that the moment arm can be increased, and the opening and closing member 131 can be pressed to open the first shell 110 and the second shell 120 more easily.

In an implementation manner, the coil induction part 100 further includes a locking structure 150, the locking structure includes a locking hole 151 and a locking pin 152, the locking hole 151 is opened at one end of the first casing 110 or the second casing 120;

after the first and

second housings

110 and 120 are opened to a predetermined angle, the locking pin 152 passes through the locking hole 151, and the position of the first or

second housing

110 or 120 is locked.

The locking structure 150 in this embodiment is used to fix the first casing 110 or the second casing 120 when the first casing 110 and the second casing 120 are in the open state, thereby realizing that the first casing 110 and the second casing 120 are opened for a long time without being closed.

It will be appreciated that a locking structure 150 should be provided on the rotating module for locking the position of the rotating module. That is, when the first housing 110 is a rotating module, the locking structure 150 is disposed on the first housing 110; alternatively, when the second housing 120 is a rotating module, the locking structure 150 is disposed on the second housing 120.

In a specific embodiment, as shown in fig. 2 and 5, a locking hole 151 is opened through one end of the second housing 120, when the first housing 110 and the second housing 120 are in the closed state, the locking hole 151 is located at a first position (considering protection of the second housing 120 from the inside of the first housing 110 and reduction of the volume of the transformer, the connection point of the second housing 120 and the first housing 110 is designed inside the transformer, when the first housing 110 and the second housing 120 are in the closed state, the first position is inside the transformer), when the first housing 110 and the second housing are in the open state, the locking hole 151 rotates to a second position (the second position is outside the transformer) along with the rotation of the second housing 120, the locking pin 152 passes through the locking hole 151, the locking pin 152 abuts against the side walls of the first housing 110 and the second housing 120, the position of the second housing 120 is locked, to achieve a long time opening of the product without being closed.

As an implementation manner, as shown in fig. 10, the first casing 110 and the second casing 120 are respectively covered with a cover 180, and the cover 180 is used for fixing the first coil assembly 111 and the second coil assembly 121 respectively.

The cover 180 and the first housing 110 and the second housing 120 may be connected by any connection method, such as but not limited to snapping, riveting, or welding.

In a specific embodiment, as shown in fig. 7-10, a buckle g1, a buckle g2, a buckle g3, and a buckle g4 are disposed on the cover 180, corresponding slots b3, b4, b5, and b6 are disposed on the first housing 110, and the buckle g1, the buckle g2, the buckle g3, and the buckle g4 are respectively engaged with the slots b3, b4, b5, and b6 to fix the cover 180 to the first housing 110; similarly, the cover 180 is fixed to the second housing 120, so that the first coil assembly 111 and the second coil assembly 121 are fixed inside the first housing 110 and the second housing 120, respectively. In practical use, in order to ensure the strength of the buckle, a reinforcing rib may be correspondingly disposed on the buckle to further ensure reliable fixation between the cover 180 and the first housing 110 and the second housing 120, respectively.

As an implementation manner, the first coil assembly 111 and the second coil assembly 121 respectively include a magnetic core 101, the magnetic core 101 is externally wrapped by an insulating shell 102, an outer wall of the insulating shell 102 is wrapped by at least two wire windings 103 along an extending direction thereof, and two adjacent wire windings 103 are connected in parallel or in series through a controllable switch.

Further, the outer wall of the insulation case 102 is provided with a rounded corner.

It should be noted that the magnetic core 101 is mainly used for providing a function of collecting a magnetic field; the material of the magnetic core 101 may be soft magnetic material, and usually, silicon steel sheet with low price is selected; the insulating shell 102 covers the magnetic core 101, and the insulating shell 102 also has the function of protecting the enameled wire; the outer wall of the insulating shell 102 is used for winding the surface, and the round angle of the outer wall is beneficial to preventing the wire from being cut due to sharp corners in the winding process.

As an implementable manner, as shown in fig. 2, 10 and 12, the coil induction part 100 further includes a stationary case 160 and a PCBA board 170;

the fixed shell 160 is fixedly connected with one end of the rotating shaft 141;

PCBA board 170 is fixed in on the set casing 160, is provided with two at least binding post 171 on the PCBA board 170, and binding post 171 is connected with the wire winding.

In this embodiment, the PCBA board is connected to the wire winding for signal transmission and processing.

As an implementation manner, as shown in fig. 13, the transformer further includes an electrical processing portion 200, the electrical processing portion 200 includes a main body 201, the main body 201 is fixedly connected with the fixed casing 160, and one end of the main body 201 is provided with an elastic probe 202, and the elastic probe 202 is electrically connected with the PCBA board 170.

In the present embodiment, the electric processing part 200 is mainly used for processing signals generated by the first coil assembly 111 and the second coil assembly 121.

In a specific embodiment, as shown in fig. 3 and 9, the first shell 110 and the second shell 120 are buckled together to form a notch c3, and the start and tail of the wire winding passes through the notch c3 to be connected with the connection terminal 171 on the PCBA board, so as to realize electrical connection and further achieve the signal output function; the PCBA board 170 is fixed on the fixed casing 160, the fixed casing 160 is provided with a rotating shaft hole h1, one end of the rotating shaft 141 is fixed at the rotating shaft hole h1, one end of the first housing 110 is also provided with a buckle b7 and a buckle b8, the fixed casing 160 is correspondingly provided with a slot h2 and a slot h3, the buckle b7 and the buckle b8 are respectively connected with the slot h2 and the slot h3 in a matching manner, so that the fixed connection between the fixed casing 160 and the first housing 110 is realized, at this time, one end of the fixed casing 160 is abutted against the first housing 110 and the second housing 120 to shield and protect the interiors of the first housing 110 and the second housing 120;

the two sides of the other end of the fixed shell 160 are further provided with a clamping groove h4 and a clamping groove h5, a buckle j1 and a buckle j2 are correspondingly arranged on the main body 201 of the electric processing part, the clamping groove h4 and the clamping groove h5 are respectively connected with the buckle j1 and the buckle j2 in a matched mode, mutual fixing of the fixed shell 160 and the main body 201 is achieved, and at the moment, the elastic probe 202 of the main body 201 is electrically connected with the PCBA board 170.

The present invention will be described in detail below with reference to an example.

When the current transformer is installed, as shown in fig. 1-13, the hole b1 of the first housing 110 is aligned with the hole d1 and the hole d2 of the second housing 120, the torsion spring is sleeved on the rotating shaft 141, one end of the rotating shaft 141 passes through the hole d1 and the hole d2 respectively and is fixed at the hole b1, the e1 end of the torsion spring is matched and fixed with the hole b2 of the first housing 110, and the e2 end of the torsion spring is matched and fixed with the hole d3 of the second housing 120;

fixing the PCBA board 170 on the fixing shell 160, fixedly connecting the start and tail ends of the windings on the first coil component 111 and the second coil component 121 on the connection terminals of the PCBA board 170 respectively, and then placing the first coil component 111 and the second coil component 121 inside the first shell 110 and the second shell 120;

the clamping groove h2 and the clamping groove h3 of the fixed shell 160 are matched and fixed with the buckle b7 and the buckle b8 of the first shell 110 respectively so as to realize the fixed connection between the first shell 110 and the fixed shell 160, one end of the fixed shell 160 is abutted against the first shell 110 and the second shell 120, and the interiors of the first shell 110 and the second shell 120 are shielded and protected;

the clamping groove h4 and the clamping groove h5 of the fixing shell 160 are respectively connected with the buckle j1 and the buckle j2 in a matched mode, mutual fixing of the fixing shell 160 and the main body 201 is achieved, at the moment, the elastic probe 202 of the main body 201 is electrically connected with the PCBA board 170, and the assembly of the current transformer is completed.

When the current sensor is used for current measurement, the opening piece 131 is inserted into the assembling hole 132 to apply pressure to the opening piece 131, the second shell 120 rotates, the first shell 110 and the second shell 120 are opened, the first shell 110 and the second shell 120 are sleeved on the periphery of an electrified cable, the pressure of the opening piece 131 is released, the first shell 110 and the second shell 120 are closed to perform current measurement, the opening and closing angle of the first shell 110 and the second shell 120 is controlled through the opening piece, the current measurement of cables with various specifications is favorably adapted, and when the first shell 110 and the second shell are required to be in an opened state and not closed, the locking pin 152 is inserted into the locking hole 151.

In summary, the current transformer can adapt to cables of different specifications through the opening and closing connection of the first shell and the second shell, is convenient to use, and can prevent the first shell and the second shell from being opened randomly through adjusting the opening and closing states of the first shell and the second shell through the opening and closing assembly, so that the use safety of products is guaranteed, and the current transformer is convenient to install and disassemble; and at least two wire windings are arranged on the first coil component and the second coil component, so that the current transformer can detect currents with different ranges, and the use is convenient.

And, through the setting of locking structure, be favorable to first casing and second casing to be in the open mode and not closed, guarantee product reliability in use.

It is to be understood that the terms "first" and "second" as referred to above are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. A current transformer, comprising a coil sensing portion, the coil sensing portion comprising: the device comprises a first shell, a second shell and an opening and closing assembly;

the coil winding device is characterized in that a first coil assembly is arranged in the first shell, a second coil assembly is arranged in the second shell, and the first coil assembly and the second coil assembly respectively comprise at least two wire windings.

2. The instrument transformer of claim 1, wherein the connection assembly comprises a shaft for connecting the first housing and the second housing.

3. The instrument transformer of claim 2, wherein the connection assembly further comprises resilient members coupled to the first and second housings, respectively, for providing a return force that maintains the first and second housings closed relative to each other.

4. The mutual inductor according to claim 3, wherein the elastic member comprises a torsion spring, the torsion spring is sleeved on the rotating shaft, one end of the torsion spring is fixed on the first casing, and the other end of the torsion spring is fixed on the second casing.

5. The mutual inductor according to any one of claims 1-4, wherein the opening and closing assembly comprises an opening and closing member and a fitting hole matched with the opening and closing member;

the opening and closing piece is inserted in the assembly hole and after the opening and closing piece receives certain pressure, the first shell and the second shell are in an open state, and after the pressure of the opening and closing piece is released, the first shell and the second shell are in a closed state.

6. The transformer according to any one of claims 1 to 4, wherein the coil induction part further comprises a locking structure, the locking structure comprises a locking hole and a locking pin, and the locking hole is formed at one end of the first shell or the second shell;

7. The mutual inductor according to any one of claims 1 to 4, wherein the first casing and the second casing are respectively covered with a cover for fixing the first coil assembly and the second coil assembly.

8. The mutual inductor according to any one of claims 1 to 4, wherein the first coil assembly and the second coil assembly respectively comprise a magnetic core, the magnetic core is externally coated with an insulating shell, the outer wall of the insulating shell is wound with the at least two wire windings along the extending direction of the insulating shell, and the two adjacent wire windings are connected in parallel or in series through a controllable switch.

9. The instrument transformer of claim 8, wherein the outer wall of the insulating shell is provided with rounded corners.

10. The transformer according to any one of claims 2-4, wherein the coil induction part further comprises a stationary case and a PCBA board;

the fixed shell is fixedly connected with one end of the rotating shaft;

the PCBA board is fixed in on the set casing, be provided with two at least binding post on the PCBA board, binding post with the wire winding is connected.

11. The instrument transformer of claim 10, further comprising an electrical processing portion comprising a main body fixedly connected to the stationary housing and provided at one end thereof with a resilient probe electrically connected to the PCBA board.