CN213025627U - Detection electromagnet and circuit break protection device - Google Patents

Abstract

The utility model belongs to the field of electromagnetic equipment, and discloses a detection electromagnet and a circuit breaking protection device, wherein the electromagnet is provided with an electromagnet assembly which is connected with an external main circuit and acts when receiving an abnormal signal; further comprising: and the detection winding is arranged in the electromagnet assembly and generates induced current in the magnetic field to be output outwards. The utility model also provides a short-circuit protection device has foretell detection electro-magnet, still including setting up tripping device and the binding post in same casing. The utility model discloses an inside detection winding that is equipped with of electro-magnet to draw its pin or link and external equipment cooperation, thereby under the prerequisite that does not change the original function of whole electro-magnet and volume, realize detecting the electric current through the electro-magnet.

Description

Detection electromagnet and circuit break protection device

Technical Field

The utility model belongs to the technical field of electromagnetic equipment, concretely relates to electro-magnet and adopt protection device that opens circuit of this electro-magnet.

Background

The electromagnet is a device which generates electromagnetism by electrifying, a commonly used method is to protect short circuit by the electromagnet, a conductive winding matched with the power of the iron core is wound outside the iron core, and the structure that the coil which is electrified with current has magnetism like a magnet is the electromagnet. In addition, in order to demagnetize the electromagnet immediately after power failure, the electromagnet is usually made of soft iron or silicon steel material with fast demagnetization. When the electromagnet is electrified, the electromagnet has magnetism, and the magnetism disappears along with the electrification after the electromagnet is powered off.

When the electric switch detects the running current of the main circuit, a signal is provided through a CT (current transformer) arranged on the main circuit. As the integration degree of electrical equipment is higher and higher, the integration of CT into a large switch has been already reported. No product is available for the miniature circuit breaker integrated CT. This patent is integrated to the electro-magnet of switch short-circuit protection to bulky CT, moves towards intellectuality for terminal switch and provides the condition.

The existing electromagnet structure can be divided into various forms according to the application and the structure, and the electromagnet structure can receive electric signals to act, so that the automatic control effect can be realized by matching with other structures. The electrical signals can be active signals and passive signals, i.e. active control and passive control. Especially, when applied to a circuit protection device, the current protection device can act in time for abnormal current, thereby cutting off a circuit or achieving other functions, in order to detect current information flowing through an electromagnet in the existing system, so as to perform data analysis or form a closed-loop system, a separate detection component, such as a transformer, is usually arranged outside the existing system, and the existing system has a large volume and cannot be directly installed in the existing equipment.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing in the prior art, the utility model provides an electro-magnet and the protection device that opens circuit that adopts this electro-magnet, it optimizes on current electro-magnet structure basis, realizes the stable detection function of electric current under its external volume and function prerequisite not changing.

The utility model discloses the technical scheme who adopts does:

in a first aspect, the present invention provides a detection electromagnet having an electromagnet assembly that is connected to an external main circuit and that operates when receiving an abnormal signal; further comprising:

and the detection winding is arranged in the electromagnet assembly and generates induced current in the magnetic field to be output outwards.

The utility model discloses in electromagnet assembly contain and to receive current signal and can produce the mechanism of corresponding action after it reaches the action threshold value, the mechanism that the above-mentioned function and concrete mode of realization are based on the electromagnetic induction principle all belongs to as long as can realize for the technical staff in the field the utility model discloses a protection object.

And simultaneously, the utility model discloses an electromagnet structure uses in the scene that needs detect and utilize its operating current, cooperates through other parts with outside and can realize different functions. For example, the operation current detection function of the circuit breaker is realized by connecting the circuit breaker with a tripping assembly, the occurrence of short-circuit current can be detected and recorded, various parameters of the operation signal can be acquired by connecting the circuit breaker with an external circuit, and the operation signal can be processed as analysis data.

There is similar function among the prior art, but is the independent detection module of outside setting, can directly detect the main circuit of joining, then can the current electromagnet structure of adaptation. And the utility model provides an electro-magnet is in order to adapt to less installation space demand as far as possible, then reduces the volume as far as possible, will detect the winding integration and form the integral type structure in the electro-magnet is inside. It should be understood that the present embodiment provides an electromagnet having the functional features of the electromagnet itself, and in order to adapt and meet different use requirements, a separate output port is provided by arranging the detection winding, and other functions are realized by matching with external devices, and the electromagnet itself is only used as a motion carrier.

It is worth explaining that, inside all has magnetic field when having the electric current in the main circuit of electro-magnet subassembly, then detects the winding and also can produce certain induced-current equally, and the characteristic of its induced-current is decided by magnetic field size, the number of turns of detecting the winding and its material characteristic, the utility model discloses only prescribe a limit to its structure, and its size and material can be adjusted according to actual need, and the technical scheme all can be realized according to the content that the present invention discloses to the skilled person.

It is worth to be further noted that the induced current generated by the detection winding can be used as an electric signal for detecting and analyzing the external detection current, so as to indirectly obtain the main circuit current information connected to the electromagnet assembly.

Or the induced current directly enters other external components to realize actions after being amplified, so as to realize different functions.

With reference to the first aspect, the present invention provides a first implementation manner of the first aspect, wherein the detection winding is connected to an external detection circuit to form a loop.

It is worth to be noted that the induced current generated by the detection winding is captured and detected by the main circuit current.

The detection winding is a columnar winding structure formed by a single enameled wire, the head end and the tail end of the detection winding can extend to the same position and extend out of the electromagnet assembly to form a connection port, and the detection purpose is achieved by connecting the detection winding in an external detection circuit in series.

With reference to the first embodiment of the first aspect, the present invention provides a second embodiment of the first aspect, wherein the electromagnet assembly includes:

the power winding is connected with the main circuit to form a loop; and

a yoke confining a magnetic field formed by the power winding inside thereof;

the detection winding is arranged in the magnet yoke.

It is worth to be noted that the electromagnet includes various structures, but all of the structures generating the magnetic field are winding structures, and the magnetic field is formed by current passing through the electromagnet connected into an external main circuit. And the magnetic yoke is a structure made of soft magnetic material and used for limiting and guiding the magnetic induction lines to be limited in a certain range.

In order to improve the detection precision, the detection winding is arranged in the magnetic yoke, so that induction current can be generated well. It will be understood by those skilled in the art that the scope of protection is limited to any electromagnet configuration having a power winding and a yoke, and that any configuration in which the sensing winding is disposed within the yoke is within the scope of protection.

In combination with the second embodiment of the first aspect, the present invention provides a third embodiment of the first aspect, wherein the power winding and the detection winding are disposed at the same position.

It is worth mentioning that the power source of the electromagnet is the passing current in the power winding, and the soft magnetic material arranged in the power winding can be magnetized with polarity, so as to realize different action requirements. And the utility model provides a detection winding then produces induced-current in the magnetic field that soft magnetic material self produced, then in order to further improve the detection precision, can have great magnetic induction intensity with its setting in power winding department.

In combination with the second embodiment of the first aspect, the present invention provides a fourth embodiment of the first aspect, wherein the power winding is disposed in the yoke, and the detection winding is disposed inside the power winding.

In combination with the first aspect, the present invention provides a fifth implementation manner of the first aspect, wherein the electromagnet assembly is a push-type structure, and includes a rod-shaped power portion, and the power winding and the detection winding are all sleeved on the power portion and isolated by an insulator.

It is worth to be noted that, the so-called push structure is a rod-shaped structure made of soft magnetic material and arranged in the power winding, and the rod-shaped structure forms a magnetic field when the power winding passes through current, and the corresponding structure arrangement can break through the limiting force when the magnetic induction intensity of the power winding rises to a certain threshold value, so as to complete corresponding actions. Because the winding is wound on a fixed structure, namely an insulator structure, the winding can be well matched with the rod-shaped power part, and the space utilization rate is improved as much as possible.

With reference to the fifth implementation manner of the first aspect, the present invention provides a sixth implementation manner of the first aspect, wherein the power portion includes a stationary core, a movable core and a push rod, which are coaxially disposed;

the plunger has a tendency to wick with the static iron and push the push rod outward after the power winding generates a magnetic field.

It should be noted that the movable iron core has a certain external limiting force, so as to avoid the malfunction, and only when a large enough power is generated, the movable iron core can act against the external limiting force.

A spring is arranged between the movable iron core and the static iron core, when a main circuit coil wound outside the iron core passes through current, magnetic flux is generated in a magnetic yoke, and magnetic force lines pass through a space (magnetic resistance) between the movable iron core and the static iron core to form a magnetic flux loop. The magnetic attraction force between the movable iron core and the static iron core is far smaller than the spring force between the movable iron core and the static iron core, and the movable iron core is pushed by the alternating magnetic force and still in a stable state under the action of the thrust continuously provided by the spring. A secondary coil is added in the magnetic yoke, and under the action of magnetic flux, the induced current of the secondary coil and the current of the primary coil of the main circuit are in a linear proportional relationship. When short-circuit current (more than 5 times of rated current) appears in the main circuit, move between iron core and the quiet iron core electromagnetic attraction and power and be far greater than the spring force, move the iron core and remove the actuation rapidly on quiet iron core, the following condition appears:

(1) because the magnetic resistance between the movable iron core and the static iron core disappears, the magnetic flux is rapidly increased, the induced current of the secondary coil is also rapidly increased, and the induced current of the secondary coil is only used in the range of rated operation current, so the use is not influenced by the instant increase of the induced current of the secondary coil;

(2) when the movable iron core rapidly runs to the static iron core, the movable iron core ejector rod simultaneously impacts the tripping mechanism, and the main circuit is disconnected at the same time.

In combination with the sixth implementation manner of the first aspect, the present invention provides the seventh implementation manner of the first aspect, wherein the movable iron core and the static iron core attract magnetic field are enough to make the detection winding generate the induced current reaching the detection threshold.

With reference to the fifth implementation manner of the first aspect, the present invention provides an eighth implementation manner of the first aspect, wherein the insulator includes:

a first insulator isolating the detection winding from the power section; and

and a second insulator isolating the detection winding from the power winding.

On the other hand, the utility model also provides a short-circuit protection device has the detection electro-magnet among the above-mentioned first aspect, still including setting up tripping device and the binding post in same casing.

The utility model has the advantages that:

(1) the utility model discloses a detect winding is arranged in the electromagnet, and the pin or the connecting end is led out to be matched with the external equipment, thereby realizing the detection of the current passing through the electromagnet on the premise of not changing the original function and volume of the whole electromagnet;

(2) the utility model discloses a double-deck insulating cover structure that is equipped with can two windings of effectual isolation, makes it each other not influence to the stable detection.

Drawings

Fig. 1 is a side view of an electromagnet assembly provided in accordance with an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of the electromagnet assembly of the present invention, which is cut along a cutting line a-a on the basis of fig. 1 according to the embodiment;

fig. 3 is a schematic axial view of an electromagnet assembly according to an embodiment of the present invention;

fig. 4 is a disassembled exploded view of the main functional components of the electromagnet assembly provided in the detailed description of the embodiment of the present invention;

fig. 5 is a schematic view of the magnetic induction lines between the stationary core and the movable core in the electromagnet assembly according to the embodiment of the present invention in a middle position having a gap;

fig. 6 is a schematic diagram of the state of the magnetic induction line between the stationary core and the movable core in the electromagnet assembly according to the embodiment of the present invention.

In the figure: 1-magnetic yoke, 2-power winding, 3-push rod, 4-static iron core, 5-movable iron core, 6-detection winding, 7-first insulator, 8-second insulator and 9-contact.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example 1:

the present embodiment discloses an electromagnet, which is applied to a circuit protection device, is connected to a main circuit, and can be regarded as a conductor structure with a negligible resistance value, so that the current passing through the main circuit is not affected, the current of the main circuit can be monitored in real time, and once a certain threshold value is exceeded, the electromagnet can act immediately, or alarm is given to the outside, or the electromagnet is directly matched with other mechanical structures to control the on/off of the circuit.

The detection device specifically comprises an electromagnet assembly and a detection winding 6 group arranged in the electromagnet assembly, wherein the electromagnet assembly comprises an action part, a magnet yoke 1 and a power winding 2.

The principle is as follows: the action component is made of soft magnetic material, and the structure can be magnetized in a magnetic field and generates a motion trend, and the action component acts once the action component is subjected to a magnetic field repulsive or attractive force exceeding a limiting force of the action component.

The power winding 2 is disposed in the yoke 1 structure and connected in series to the main circuit, and the main circuit of the present embodiment has a continuous steady current, which means that even if the current passing through the main circuit has a fluctuating value, the magnetic field generated when the current at the peak passes through the power winding 2 cannot cause the operation of the operating member. The current passing through the power winding 2 can cause the action of the action member only in the presence of a short-circuit current or other overcurrent conditions, while for the electromagnet assembly it has reversibility, i.e. after action, when its current is reduced and returns to normal, the action member can return to the initial position under the action of a restraining force.

Further, the detection winding 6 in this embodiment is an enameled wire, and is the same as the power winding 2, and both are disposed in the structure of the magnetic yoke 1. Since the structure of the magnetic yoke 1 also adopts soft magnetic materials, the magnetic induction lines can be limited in the magnetic yoke after the power winding 2 generates a magnetic field.

Furthermore, in order to improve the detection accuracy, the number of turns of the detection winding 6 is far larger than that of the power winding 2, and the cross-sectional area of the detection winding is far smaller than that of the power winding 2, so that the volume of the detection winding can be reduced as much as possible. Likewise, the detection winding 6 is placed in the same position as the power winding 2 and is isolated from each other by the presence of insulating material to avoid mutual interference.

In this embodiment, the detection winding 6 is a coil structure formed by winding a single enameled wire, and the head and tail ends of the coil structure extend to the middle, or one end of the coil structure extends to the other end, and then the coil structure is led out at the same position and connected with an external detection circuit to form a loop.

The detection circuit of the embodiment is provided with a rectifying and amplifying module, and can detect the induced current generated by the detection winding 6 and send the information to the outside.

Example 2:

the embodiment discloses an integral type electromagnet structure, specifically includes the casing and sets up the electromagnet assembly in the casing.

The electromagnet assembly comprises an armature, an iron core and a power winding 2, the power winding 2 is an enameled wire and is wound outside the iron core, and the power winding 2 is connected in series in an external main circuit.

The armature iron and the iron core are arranged at a certain distance and movably connected through the insulating structure, the armature iron is provided with a natural magnet, and the armature iron is driven to act after the natural magnet is attracted or repelled, so that the armature iron and the iron core are matched with an external part of the shell to realize the electric control effect.

The iron core is made of soft magnetic material and is magnetized when the power winding 2 passes through current, and a magnetic field is generated in the iron core. Due to the characteristics of the soft magnetic material, the iron core can be magnetized to have polarity, and meanwhile, the magnetic induction lines can be limited in the iron core.

While an electromagnet with a polarity can attract or repel the armature, which acts once the attraction or repulsion force is greater than the limiting force of the armature. In the embodiment, the spring arranged in the shell provides continuous limiting force for the armature, so that the armature can return to the initial position when the attractive force or the repulsive force is insufficient.

Specifically, the power winding 2 in this embodiment is disposed at a rod-shaped portion of the iron core, and is isolated from the iron core by an insulating sleeve. Still be equipped with another coil structure between iron core and insulating cover: 6 windings are detected.

The detection winding 6 is formed by winding a single enameled wire, the number of turns of the detection winding is far higher than that of the power winding 2, and the cross-sectional area of the detection winding is far smaller than that of the power winding 2, so that the space occupied by the detection winding 6 is smaller, and the size of the detection winding is not greatly changed compared with that of the existing electromagnet structure by adjusting the cross-sectional diameters of the iron core and the insulating sleeve.

The head end and the tail end of the detection winding 6 penetrate out of the same position and are connected with a PCB arranged in the shell, and the induced current generated by the winding is detected by a detection circuit integrated on the PCB.

Because the power winding 2 is connected in series with the external main circuit, the main circuit in the embodiment is used for providing power for the load equipment, the electromagnet in the embodiment is also matched with other external components, namely a tripping switch arranged on the main circuit, and when continuous overload current occurs in the main circuit, the power winding 2 causes the iron core to generate sufficient magnetic force to enable the armature to act. At the moment, because a magnetic field is formed in the iron core, certain induced current can be generated in the detection winding 6 group wound on the iron core according to the electromagnetic induction principle, and the parameters are sent out in a wired or wireless mode after being detected by the detection circuit. The background server can analyze the action information and adjust the system after the fault is eliminated, so that the same fault can be prevented from happening again.

Example 3:

the present embodiment provides an integrated electromagnet structure, as shown in fig. 1 to 4, specifically a push rod 3 type electromagnet disposed in a circuit breaker.

As can be seen in fig. 1, the circuit breaker includes an electromagnet assembly and a contact 9, where the contact 9 in this embodiment is a stationary contact, and is used to make and break in cooperation with a movable contact of a trip mechanism in the circuit breaker.

The electromagnet assembly comprises an external magnet yoke 1, an iron core is fixed in the magnet yoke 1, and the power winding 2 is wound outside the iron core.

In fig. 1, the bent portion on the left side is the contact 9 portion, which is communicated with the left end of the power coil on the electromagnet assembly. And the metal sheet body on the right side is connected with the other wiring end in the circuit breaker, and when the movable contact and the fixed contact are attached and conducted, the whole power winding 2 is connected in series on an external main circuit connected with the circuit breaker.

As can be seen in fig. 2 and 4, the iron core includes a movable iron core 5, a stationary iron core 4 and a push rod 3, the movable iron core 5 is movably connected with the stationary iron core 4, and a certain distance is provided between the movable iron core 5 and the stationary iron core 4.

Wherein, the inside central point of quiet iron core 4 puts and is equipped with the through-hole, and push rod 3 sets up in this through-hole and can slide along this through-hole axis. One end of the push rod 3 is connected with the movable iron core 5, when the movable iron core 5 acts, the push rod 3 is pushed to act simultaneously, and the push rod 3 extends out of the electromagnet assembly and pushes a tripping mechanism in the circuit breaker to trip.

As can be seen from fig. 2 and 4, the first insulator 7 is sleeved outside the iron core, the first insulator 7 is of a sleeve structure, and is directly sleeved outside the iron filings, and the end portion of the first insulator is fixedly connected with one side of the magnetic yoke 1. The winding has the detection to wind 6 groups on first insulator 7, should detect and wind 6 groups and form for thinner single enameled wire winding, and its tip is worn out the casing and is equipped with the link on the casing, is connected with outside thing networking module through the wire, can with detect in the current information real-time delivery of winding 6 groups to the rear end server.

And a second insulator 8 is arranged outside the detection winding 6, the second insulator is also in a sleeve structure, the power winding 2 is arranged outside the second insulator 8, and the end part of the second insulator 8 is fixed on the other side of the magnetic yoke 1 in the embodiment, so that the power winding 2, the movable iron core 5, the static iron core 4 and the detection winding 6 are fixed inside the magnetic yoke 1.

The operation principle of the embodiment is as follows: in a normal state, a continuous steady current exists in the main circuit, and when the current value does not reach the operation threshold value, the two contacts 9 in the circuit breaker are in contact with each other to form a passage. The dynamic winding 2 magnetizes the movable iron core 5 and the static iron core 4 with polarities, and attraction force can be generated due to the fact that the movable iron core 5 and the static iron core 4 are the same in polarity, so that the movable iron core 5 has a tendency of moving towards one side of the static iron core 4.

However, since the return spring is arranged between the movable iron core 5 and the stationary iron core 4, the movable iron core 5 has a certain limiting force, and the attraction force between the movable iron core 5 and the stationary iron core is smaller than the elastic force of the return spring in a normal state, so that the movable iron core 5 is kept in a fixed state.

At this time, because the two iron cores both form a magnetic field, when the two iron cores are not attached, the detection winding 6 group in the magnetic field cannot generate enough induced current, and the current information received by the background server is zero or smaller than the recording threshold value at this time.

When short-circuit current occurs in the main circuit, the excessive continuous current causes enough attraction force to be generated between the iron cores wound by the power winding 2, so that the movable iron core 5 acts. Meanwhile, at the moment that the movable iron core 5 is attached to the static iron core 4, the magnetic field of the movable iron core is enough to enable induced current generated in the detection winding 6 group to be detected, so that current data are fed back to the background server for data analysis when the movable iron core is disconnected.

Wherein, fig. 5 and fig. 6 are used to show the magnetic induction line states of the movable iron core 5 and the static iron core 4 in two states, as explained earlier, because there is a gap between the movable iron core 5 and the static iron core 4, the external power winding 2 provides magnetic flux, and a magnetic field is generated at the gap after the connection of the soft magnet. The total magnetic flux in the magnetic circuit is conserved, but the magnetic flux density at the gap is relatively reduced, and a part of the magnetic flux is lost at the non-gap, namely leakage flux, so that the magnetic resistance in the magnetic circuit is caused.

When the two iron cores are jointed, a short-time integrated iron core structure is formed, so that magnetic leakage disappears, and the magnetic flux density in the passive detection winding 6 group is rapidly increased, so that induced current generated by the passive detection winding is also increased.

It is worth to be noted that the structure of the circuit breaker in the embodiment is small in size, the current transformer cannot be directly installed and sleeved on a line, the adopted detection winding 6 groups are directly wound in the electromagnet assembly, and the size of the circuit breaker is unchanged compared with the existing structure, so that the installation requirement of a small space can be met. But also an independent circuit board can be arranged in the shell of the circuit breaker, and the detection winding 6 groups are connected with the circuit board to form a detection loop, so that current parameters are directly obtained and sent outwards.

Example 4:

the embodiment discloses a circuit breaking protection device which comprises a wiring terminal, a tripping component, an operating handle, an electromagnet and an arc extinguishing component.

Wherein the connecting terminal is connected in series with the main circuit, and the internal connecting terminal, the electromagnet and the arc extinguishing component are connected in sequence to form a series circuit. The operating handle is in transmission connection with the tripping mechanism and can control the tripping mechanism to be switched on and off. The lower part of the tripping mechanism is provided with a movable contact, the electromagnet assembly is provided with a fixed contact, and the movable contact is jointed and communicated with the fixed contact in a normal state.

The electromagnet in the embodiment adopts the electromagnet structure in the embodiments 1 to 3, an independent PCB is arranged in the circuit breaker, a detection circuit and a wireless transmission module are integrated on the circuit board, the circuit board is powered by an external main circuit, the detection circuit is connected with a detection winding 6 in the electromagnet to form a loop, and detected current information can be processed and then transmitted outwards.

The present invention is not limited to the above-mentioned alternative embodiments, and various other products can be obtained by anyone under the teaching of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the following claims, and which can be used to interpret the claims.

Claims (10)

1. A detection electromagnet is provided with an electromagnet assembly which is connected with an external main circuit and acts when receiving an abnormal signal; it is characterized by also comprising:

and the detection winding (6) is arranged inside the electromagnet assembly and generates induced current in the magnetic field to be output outwards.

2. A detection electromagnet according to claim 1, characterised in that the detection winding (6) is connected to an external detection circuit forming a circuit.

3. A detection electromagnet according to claim 1, wherein said electromagnet assembly comprises:

the power winding (2) is connected with the main circuit to form a loop; and

a yoke (1) which confines a magnetic field formed by the power winding (2) inside;

the detection winding (6) is arranged in the magnet yoke (1).

4. A detection electromagnet according to claim 3, characterised in that the power winding (2) and the detection winding (6) are placed in the same position.

5. A detection electromagnet according to claim 3, characterized in that the power winding (2) is arranged in the yoke (1) and the detection winding (6) is arranged inside the power winding (2).

6. A detection electromagnet according to claim 3, characterized in that the electromagnet assembly is of push-type construction, comprising a rod-shaped power section, the power winding (2) and the detection winding (6) being arranged around the power section and separated therefrom by an insulator.

7. A detection electromagnet according to claim 6, characterized in that the power part comprises a static iron core (4), a movable iron core (5) and a push rod (3) which are coaxially arranged;

after the power winding (2) generates a magnetic field, the movable iron core (5) has the tendency of being absorbed with the static iron core (4) and pushing the push rod (3) outwards.

8. A detection electromagnet according to claim 7, characterized in that the magnetic field generated by the attraction of the moving core (5) and the static core (4) is sufficient to generate an induced current in the detection winding (6) up to the detection threshold.

9. A detecting electromagnet according to claim 6, characterized in that said insulating body comprises:

a first insulator (7) isolating the detection winding (6) from the power section; and

and a second insulator (8) for isolating the detection winding (6) from the power winding (2).

10. A short circuit protection device characterized by: the detection electromagnet as claimed in any one of claims 1 to 9, further comprising a trip mechanism and a connection terminal provided in the same housing.

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