CN112038201A

CN112038201A - Time-delay action electromagnet and circuit breaker using same

Info

Publication number: CN112038201A
Application number: CN202011034423.7A
Authority: CN
Inventors: 李欣
Original assignee: XIAMEN TAIHANG TECHNOLOGY CO LTD
Current assignee: XIAMEN TAIHANG TECHNOLOGY CO LTD
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2020-12-04

Abstract

The invention belongs to the technical field of circuit breakers and discloses a time-delay action electromagnet and a circuit breaker applying the electromagnet. The circuit breaker is also disclosed, and the time-delay action electromagnet is adopted; the main circuit is a circuit connected into the circuit breaker, and the electromagnet assembly is linked with a tripping mechanism arranged in the circuit breaker. The electromagnet assembly is provided with an action part, and the electromagnet assembly can act to push an external mechanism to generate corresponding action after receiving specific current, so that the main circuit or load equipment connected with the main circuit is controlled, and the effect of automatic starting is achieved.

Description

Time-delay action electromagnet and circuit breaker using same

Technical Field

The invention belongs to the technical field of circuit breakers, and particularly relates to a mutual inductance current driven time-delay action electromagnet.

Background

A backup overcurrent protection device is arranged on a power supply SPD, and the purpose is that when the SPD has a metallic short-circuit fault, the overcurrent protection device can rapidly cut off a circuit, and the phenomenon that a protection switch is tripped out in a grade-crossing manner to cause large-area power failure of a power supply system is avoided. The other function is to prevent the SPD from starting to flow into the power frequency short circuit current to cause fire when the voltage of the power supply system rises abnormally.

The SSD (miniature circuit breaker capable of blocking power frequency short-circuit current through pulse current) is used at present, and comprises an operation wrench, an electromagnet, a tripping mechanism, a moving contact and a static contact, so that the problems of SPD ignition and SPD lightning protection failure are solved. The SSD is a component for a shunt option to pass through, which is formed by discharge gaps connected in parallel at two ends of an electromagnet coil, and the discharge gaps can not be used in a direct-current power supply system because arcs are extinguished by utilizing alternating-current zero crossing. In addition, the cost of the discharge gap is high, so that the SSD is difficult to be compared with the MCB for wide use.

The parallel circuit with the pulse current independent conduction branch circuit is mostly adopted in the existing alternative schemes, but the pulse current conduction equipment in most schemes is high in cost or poor in stability, and the popularization of products is not facilitated.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides an electromagnet and a circuit breaker using the electromagnet.

The technical scheme adopted by the invention is as follows:

in a first aspect, the invention discloses a time-delay action electromagnet which is provided with an electromagnet assembly and a mutual inductor assembly connected with a main circuit, wherein the mutual inductor assembly is connected with the electromagnet assembly through a time delay device.

The electromagnet assembly is provided with an action part, and the electromagnet assembly can act to push an external mechanism to generate corresponding action after receiving specific current, so that the main circuit or load equipment connected with the main circuit is controlled, and the effect of automatic starting is achieved.

It is worth to say that, the existing circuit breakers mostly adopt an electromagnetic tripping structure, and the structure has good sensitivity and use stability, and can be reset for continuous use after fault removal. However, the existing electromagnetic trip structure and the access circuit are arranged in series, and act in time when any abnormal current occurs, wherein the abnormal current includes pulse current. However, for the function of realizing the leakage of the pulse current by matching with other devices in part of the circuit breakers, the circuit breaker is required to be free from misoperation when the pulse current is connected, so that the leakage is realized by matching with other devices.

The delayer is matched with the mutual inductor, and the characteristic of short duration time of the delayer can be utilized when pulse lightning current occurs, so that the electromagnet cannot be caused to act by the electric energy flowing into the electromagnet assembly due to the fact that the delayer absorbs part of the electric energy.

The time delay device can delay the induction current transmitted by the mutual inductor assembly by delta t to reach the electromagnet, wherein the delay delta t refers to the time difference between the time when the induction voltage/current reaches the maximum value and the time when the voltage/current on the electromagnet reaches the maximum value.

As the current passing through the main circuit is mainly pulse lightning current and power frequency short-circuit current, the two situations are special conditions. When the impulse lightning current with extremely short duration (generally in microsecond level) appears, the peak current can reach the electromagnet by the time delay delta t due to the action of the delayer, and the time of a few microseconds is obviously shorter than the delta t time of the common delayer, so that the current does not reach the peak value, the current energy on the electromagnet is small, only the initial section of electric energy is used, the action threshold value cannot be reached, and the effect of preventing the impulse lightning current from misoperation is realized.

And the power frequency short-circuit current is continuous current, and when the power frequency short-circuit current exists after the delta t time, the electromagnet can continuously receive electric energy and can act after reaching an action threshold value, so that the power frequency short-circuit current is matched with other parts to realize specific functions.

It should be noted that, unlike the prior art, the electromagnet assembly of the present invention is connected to the main circuit through the transformer assembly separately installed, so that the transmission of the current signal can be realized according to the electromagnetic induction principle.

The mutual inductor component comprises a plurality of coils wound on the same closed iron core, wherein one coil is connected in series in a circuit of current to be measured, so that the coil always has all current of the circuit flowing through; and the other coils have more turns, and then are connected in series in the measuring instrument or the protection circuit, and when the current transformer works, the circuit of the series measuring instrument or the protection circuit is always closed, so that the impedance of the series coils 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 mutual inductor component mainly plays a role in current transformation and electrical isolation, and meanwhile the mutual inductor component originally adopts the same fixed iron core structure to enable the mutual inductor component to have a magnetic saturation characteristic.

The magnetic saturation characteristic is the characteristic that the magnetic flux passing through the magnetic conductive material of the iron core cannot be increased wirelessly, so that the situation that the action of the electromagnet assembly is influenced by superposition even if the coil connected into the main circuit bears pulse current for many times is ensured. The part is different from the prior art, and can be applied to a direct current circuit by matching with a delayer structure, and the electromagnet can be enabled to act only under the influence of continuous and uninterrupted abnormal current by utilizing the time domain difference between the pulse lightning current and normal current and power frequency short-circuit current.

Further, the transformer assembly comprises a primary winding and a secondary winding wound on the same transformer core;

the primary winding is connected with the main circuit;

and the secondary winding is connected with the electromagnet assembly through a time delayer.

Further, the secondary winding is connected with the delayer in series or in parallel.

Further, the number of turns of the primary winding is smaller than that of the secondary winding.

Furthermore, the delayer is one or more of a capacitive charging type structure, an inductive time delay structure and a mechanical time delay structure.

It is worth to be noted that, the capacitor charging structure is that a capacitor is connected in parallel between the secondary winding and the electromagnet coil, and because the main circuit in the invention has particularity, no continuous current passes through the main circuit in a normal state, and only pulse current appears. In the presence of the pulse current, the secondary winding of the inductor assembly develops an induced current that charges the capacitor. Because the pulse lightning current has extremely short duration, even if the induced current is large, the electromagnet assembly cannot act, and when the continuous leakage current flows, the delayer of the capacitor structure is fully charged, and once the induced current reaches a certain threshold value, the electromagnet assembly acts immediately.

The inductance delay structure also has a certain hysteresis effect, specifically, the inductance delay structure has a phase relation of current hysteresis voltage of 90 degrees, so that the current cannot change suddenly, and when the accessed current is increased, the direction of the induced current generated by the inductance delay structure is opposite to the accessed current. When the inductance coil is just electrified, the current changes rapidly, the induced current is large, and the induced current is superposed with the original current, so that the current in the coil can only be increased from 0 until the current changes to 0, and the current in the coil can not reach the maximum. Different from a capacitor structure, the inductor delay structure prevents the influence of the inductor delay structure on an electromagnet coil by using the mutability of pulse lightning current.

The mechanical delay structure is a mechanical structure having a variable part, which operates when a continuous current is generated, and conducts an induced current to an electromagnet coil. It should be understood by those skilled in the art that the mechanical delay structure mentioned in the present invention is within the scope of the present invention as long as the induced current generated by the transient pulse lightning current is not misbehaving, and the continuous leakage current can cause the action and make the electromagnet coil and the transformer assembly conduct normally.

Furthermore, the electromagnet assembly comprises a frame body and an electromagnet coil arranged in the frame body, and the action is realized through a movable iron core which is arranged in the electromagnet coil and can reciprocate on the frame body.

Furthermore, the electromagnet assembly is matched with a switch arranged on the main circuit, and when power frequency short-circuit current occurs in the main circuit, the electromagnet assembly acts to enable the main circuit to form an open circuit.

The electromagnet of the invention mainly has the advantages that the pulse lightning current is not mistakenly interrupted, and the continuous power frequency short-circuit current can act, so that the connected main circuit or the load equipment on the main circuit are linked. And the linkage with the switch arranged on the main circuit indicates that the electromagnet assembly can cut off the main circuit when power frequency short-circuit current occurs, thereby providing a protection effect for the load equipment or the branch circuit thereof.

On the other hand, the circuit breaker is also disclosed, and the time-delay action electromagnet is adopted;

the main circuit is a circuit connected into the circuit breaker, and the electromagnet assembly is linked with a tripping mechanism arranged in the circuit breaker.

Further, the device comprises an upper terminal, a fixed contact, a lower terminal and a movable contact which are connected in series;

the transformer assembly is connected in series between the upper terminal and the stationary contact.

It should be noted that, the upper terminal and the lower terminal are only referred to by different technical terms for distinguishing different connection terminals, and do not limit specific input/output ports, and those skilled in the art should understand that two ways are included, and no matter how the input/output ports are arranged, only the relation and arrangement between the fixed contact and the movable contact are limited.

Furthermore, the tripping mechanism is a shifting lever type resettable structure.

It should be noted that the poking rod type circuit breaker is provided with a poking rod at the outside, and the internal tripping mechanism can be actuated by operating the poking rod. Originally, the electromagnet assembly can enable the tripping mechanism to be switched from a switching-on state to a switching-off state, and the driving lever can be pulled back manually or through automatic equipment after the fault is eliminated, so that the effect of repeated use is achieved.

The invention has the beneficial effects that:

(1) according to the invention, by adopting the mutual inductor component, the increase of the secondary magnetic flux of the lightning pulse current is limited by the magnetic saturation characteristic of the mutual inductor component, and then a constant current state is presented on the connected secondary winding, so that the performance of a timing circuit is ensured;

(2) the invention achieves the function of replacing the discharge gap by matching the time delayer with the mutual inductor component, can be applied to a direct current circuit, can resist lightning current impact without error disconnection, and simultaneously stably acts when power frequency short-circuit current occurs to cause an external matching structure to act, thereby playing the effect of protecting a main circuit or a load.

Drawings

FIG. 1 is a schematic diagram of an electromagnet with a transformer and a time delay according to the present invention;

FIG. 2 is a schematic view of the structure of the electromagnet cooperating with the terminal and the trip mechanism;

fig. 3 is a schematic view of the internal structure of a circuit breaker in embodiment 6 of the present invention;

FIG. 4 is a schematic diagram of the electromagnet of the present invention in an electrical circuit;

fig. 5 is a schematic structural diagram of the entire electromagnet structure applied in the SSD module and the SPD module in series in embodiment 6 of the present invention;

fig. 6 is a schematic diagram of an electromagnet circuit in embodiment 2 of the present invention;

fig. 7 is a schematic diagram of an electromagnet circuit according to embodiment 5 of the present invention, which is mainly used to demonstrate the structural principle of the delayer;

FIG. 8 is a graph showing the results of the test in example 5 of the present invention.

In the figure: 1-primary winding, 2-secondary winding, 3-transformer iron core, 4-delayer, 5-electromagnet assembly, 5.1-frame, 5.2-movable iron core, 5.3-static iron core, 5.4-electromagnet coil, 6-upper terminal, 7-lower terminal, 8-closing wrench, 9-tripping mechanism, 10-static contact, 11-movable contact, 12-indicator, A-transformer assembly.

Detailed Description

The invention is further explained below with reference to the drawings and the specific 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 embodiment discloses an electromagnet, uses in low-voltage circuit protection equipment, mainly can stably switch on pulse lightning current to move when power frequency breaking current appears.

Specifically, the device comprises three parts, namely an electromagnet assembly 5, a delayer 4 and a mutual inductor assembly A from top to bottom in sequence.

The mutual inductor component A and the electromagnet component 5 are connected in series to form a loop, and the delayer 4 is connected with the mutual inductor component A in parallel.

The mutual inductor component A is internally provided with at least two groups of coils which are wound on the same iron core, one group of coils is connected with the external main circuit in series, and the other group of coils is connected with the coils of the electromagnet component 5 in series.

When the external main circuit reaches the other end through the lower coil of the transformer assembly A, the secondary current generated by the transformer drives the electromagnet through the delayer 4. When pulse lightning current occurs in the main circuit, the secondary current of the mutual inductor component A passes through the time delay device 4, and because the duration time of the lightning pulse is shorter than the time delay time, and part of electric energy is captured by the time delay device 4, the electric energy reaching the electromagnet component 5 is not enough to enable the electromagnet component to act. When power frequency short circuit current occurs in the main circuit, the secondary current of the mutual inductor component A is sent to the electromagnet component 5, and as the power frequency duration is far longer than the electromagnet delay time, the electric energy reaching the electromagnet component 5 is enough to enable the electromagnet component 5 to act.

The electromagnet technology in this embodiment 1 can be applied to a plurality of circuit protection modules, can be integrated in a circuit breaker, and can also form an independent module at the same time, so as to realize a linkage effect with other external devices through a mechanical structure, or directly send an action signal to the outside through a wireless communication module provided therein.

Example 2:

the embodiment also discloses an electromagnet structure, which is mainly applied to a backup protector and realizes stable current leakage of pulse lightning current through the cooperation with a surge protector.

Specifically, as shown in fig. 1 and 4, the specific structure of the electromagnet is shown, including the upper electromagnet assembly 5.

This electromagnet assembly 5 is common structural design, including rectangle support body 5.1, and this rectangle support body 5.1 left side is equipped with the moving part, through dismantling mountable inner structure.

The inside cylindrical electromagnet coil 5.4 structure that is, it twines on the iron core, and the left side is quiet iron core 5.3, and the right side is for moving iron core 5.2, moves iron core 5.2 and cup joints with quiet iron core 5.3 and can only follow its axis direction reciprocating motion under support body 5.1 restriction.

A time delay device 4 with a capacitance charging type structure is arranged below the electromagnet assembly 5 and is connected with an electromagnet coil 5.4 in parallel through a lead. It should be noted that the delayer 4 and the electromagnet coil 5.4 are shown in parallel, but in actual installation, a series connection mode can be adopted, and the series connection can also absorb electric energy in a loop to achieve a delay effect.

The lower part of the delayer 4 is a mutual inductor component A, the mutual inductor component A in the embodiment has a compact structure and mainly comprises an annular mutual inductor iron core 3 and an upper cylindrical mounting seat and a lower cylindrical mounting seat which are made of insulating materials. The upper cylindrical mounting seat is sleeved with a secondary winding 2, and the lower part is a primary winding 1.

It can be seen that the number of turns of the primary winding 1 is much smaller than that of the secondary winding 2, and the conductor cross-sectional area of the primary winding 1 is much larger than that of the secondary winding 2. The primary winding 1 is connected in series with the external main circuit, the arrows indicating the current direction.

The electromagnet in the embodiment is applied to the SSD module, and has the main function of conducting pulse lightning current and can act to enable the main circuit to form an open circuit when power frequency short-circuit current occurs, so that the external SPD module is protected.

The action principle is as follows:

firstly, the primary winding 1 is connected in series with a main circuit, the primary winding 1 and the secondary winding 2 are in mutual inductance relationship, the secondary winding 2 and the electromagnet coil 5.4 are connected in series to form a complete loop, and the loop is connected with a time delay 4 in parallel.

When the pulse lightning current occurs in the main circuit, due to the transient characteristic of the pulse lightning current, the amount of the induced current generated in the secondary winding 2 is insufficient, and part of the electric energy is used for charging the delayer 4, so that the electric energy reaching the electromagnet coil 5.4 is insufficient to push the movable iron core 5.2 to move.

When the main circuit has circuit problems or the SPD module is degraded, the leakage current phenomenon occurs. At this time, because the continuous current passes through, when the time delay device 4 reaches the full-charging state due to the stable induced current generated by the secondary winding 2, the electromagnet coil 5.4 will receive more electric energy and push the movable iron core 5.2 to move outwards after the electric energy reaches the threshold value, so as to push the switch arranged on the main circuit to be switched off.

Example 3:

the embodiment also discloses a time-delay action electromagnet which is provided with an electromagnet assembly 5 and further comprises a mutual inductor assembly A connected with the main circuit, wherein the mutual inductor assembly A is connected with the electromagnet assembly 5 through a time delay device 4. The electromagnet assembly 5 is provided with an action part which can act to push an external mechanism to generate corresponding action after receiving specific current, so that the main circuit or load equipment connected with the main circuit is controlled, and the effect of automatic starting is achieved.

The mutual inductor component A mainly plays a role in current transformation and electrical isolation, and meanwhile the mutual inductor component A originally adopts the same fixed iron core structure to enable the mutual inductor component A to have a magnetic saturation characteristic. Specifically, the characteristic that the magnetic flux passing through the magnetic conductive material of the iron core cannot be wirelessly increased is mainly utilized, so that the situation that the action of the electromagnet assembly 5 is influenced by superposition even if the coil connected to the main circuit bears a plurality of pulse currents is ensured.

The part is different from the prior art, and can be applied to a direct current circuit by matching with a delayer 4 structure, and the electromagnet can be enabled to act only under the influence of continuous and uninterrupted abnormal current by utilizing the time domain difference between the pulse lightning current and normal current and power frequency short-circuit current.

Specifically, the transformer assembly a in the present embodiment includes a primary winding 1 and a secondary winding 2 wound around the same transformer core 3; the primary winding 1 is connected with a main circuit; and the secondary winding 2 is connected with an electromagnet assembly 5 through a time delay device 4, wherein the secondary winding 2 is connected with the time delay device 4 in parallel.

As can be seen in fig. 1, the number of coil turns of the primary winding 1 is smaller than that of the secondary winding 2, which is a current transformer structure.

The delayer 4 in this embodiment is an inductive delay structure, specifically, an electromagnetic induction coil.

The inductive time delay structure is the same as the other time delay devices 4 in structure and also has a certain hysteresis effect, specifically, the inductive time delay structure has a phase relation that the current lags by 90 degrees, so that the current cannot change suddenly, and when the accessed current is increased, the direction of the induced current generated by the inductive time delay structure is opposite to the accessed current. When the inductance coil is just electrified, the current changes rapidly, the induced current is large, and the induced current is superposed with the original current, so that the current in the coil can only be increased from 0 until the current changes to 0, and the current in the coil can not reach the maximum. Different from a capacitor structure, the inductor delay structure prevents the influence of the inductor delay structure on the electromagnet coil 5.4 by using the mutability of the pulse lightning current.

As can also be seen in fig. 2, the electromagnet assembly 5 comprises a frame 5.1 and an electromagnet coil 5.4 arranged in the frame 5.1, and is actuated by a movable iron core 5.2 arranged in the electromagnet coil 5.4 and capable of reciprocating on the frame 5.1. The electromagnet assembly 5 is matched with a switch arranged on the main circuit, and when power frequency short-circuit current occurs in the main circuit, the electromagnet assembly acts to enable the main circuit to form open circuit.

Example 4:

the present embodiment is optimized based on the above embodiment 1, and specifically, the time delay device 4 adopted in the present embodiment is a metal sheet structure, and is directly connected in parallel to the loop formed by the electromagnet coil 5.4 and the secondary winding 2.

The metal sheet structure has a certain resistance value, which is originally in a normally closed state, and the resistance value is low, so that most of induced current generated by the secondary winding 2 passes through the metal sheet, and the current passing through the electromagnet coil 5.4 is low, so that the metal sheet structure cannot act.

When the pulse lightning current appears in the main circuit, the generated current is not enough to change the metal sheet body due to the characteristics of instantaneous generation, and the electromagnet assembly 5 does not malfunction.

And once continuous power frequency short circuit current appears in the main circuit, the induced current continuously flows through the metal sheet body, so that the metal sheet body generates heat and deforms, the branch circuit is broken, and the induced current passes through the electromagnet coil 5.4 to enable the movable iron core 5.2 to move outwards.

Example 5:

the embodiment discloses an electromagnet, and the specific structure is shown in fig. 1, wherein it can be seen that the electromagnet mainly comprises an electromagnet assembly 5, a time delay unit 4 and a mutual inductor assembly a.

As in the above-described embodiment, the transformer assembly a includes the primary winding 1 and the secondary winding 2 wound around the same toroidal transformer core 3, and the lower primary winding 1 is connected in series with an external main circuit.

The internal structure of the time delay device 4 of the present embodiment is shown in fig. 7, and fig. 7 shows a specific circuit schematic diagram of the time delay device 4, and it can be seen that the lower part in the diagram is two windings of the transformer assembly a, the lower side is the primary winding 1, and the upper side is the secondary winding 2.

The secondary winding 2 is connected with a rectifier bridge, is connected with an electromagnet coil 5.4 through the rectifier bridge, and is connected with at least one capacitor in parallel in the middle.

Through experimental tests, as shown in fig. 8, which shows the variation curve of single voltage/current with time when the whole electromagnet structure is subjected to impulse lightning current impact, it can be seen that the upper part is electromagnet coil 5.4 data, and the lower part is secondary winding 2 data, the secondary winding 2 is in sine wave shape and is in T₁The peak is reached. However, due to the arrangement of the capacitor structure, the capacitor is charged first by the current passing through the rectifier bridge, and the change of the voltage/current of the electromagnet coil 5.4 is small in the early stage. At T₁At this time, the electric quantity of the secondary winding 2 reaches a peak value, and the electromagnet coil 5.4 of the electromagnet does not reach an action threshold value. Through T₁And then, the electric quantity of the secondary winding 2 is reduced and the secondary winding is commutated, but because a rectifier bridge is arranged, reverse current cannot pass, so that the voltage/current of the electromagnet coil 5.4 is suddenly reduced, electric energy is released by a capacitor to generate reverse current, and a change curve of single pulse lightning current impact is completed.

Tests show that the structure of the delayer 4 in the embodiment has high stability, peak current can be effectively delayed to reach the electromagnet coil 5.4, and the reached electric energy is reduced, so that the electric energy cannot reach an action threshold value.

In the figure T₁To T₂The time difference is delta t, the time delay device 4 is used for delaying the delta t current from reaching the electromagnet coil 5.4 when the main circuit generates current, and the action of the electromagnet cannot be influenced by the characteristics of pulse lightning current in microsecond level.

Example 6:

the present embodiment specifically discloses a circuit breaker, which adopts the electromagnet structure in the above embodiments 1 to 5, and combines with other functional components to form a circuit breaker structure.

Specifically, as shown in fig. 2 and 3, the circuit breaker includes a breaker case and two terminals provided in the case, an upper terminal 6 on the left side and a lower terminal 7 on the right side, and is connected in series with an external main circuit through the two terminals.

The left part of the middle part is any electromagnet structure in the above embodiments, and the electromagnet assembly 5, the delayer 4 and the mutual inductor assembly a are arranged from top to bottom in sequence. The primary winding 1 of the transformer assembly a is seen to be a metal strip structure with a large cross-sectional area, one end of which is connected to the upper terminal 6, the other end of which extends outwards and turns upwards, and a stationary contact 10 is arranged at the end.

And the middle part close to the right part is a tripping mechanism 9, and the upper part of the tripping mechanism 9 is connected with a closing wrench 8 through a push rod. The lower end of the tripping mechanism 9 is provided with a movable contact 11, which moves along with the tripping mechanism 9 and is abutted and communicated with the fixed contact 10 when closing. And the movable contact 11 is connected to the lower terminal 7 through a soft metal cable.

The whole circuit breaker is an SSD module, as shown in fig. 5, and is connected in series with an external SPD module to form a grounded lightning leakage branch, and the right side in fig. 5 is an internal schematic diagram with a half shell removed. The circuit breaker structure can timely form a circuit breaking protection whole circuit when the SPD module is degraded, and can be stably conducted without error breaking when multiple pulse lightning flows pass through.

Meanwhile, the structure in the SPD module can be integrated in the SSD module, the inner part of the SPD module is separated into two parts through a partition plate structure, a circuit board with an internet of things module is additionally arranged in the internal vacant space, and an indicator 12 for feeding back the internal on-off state is arranged on the shell.

The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.

Claims

1. A time delay action electromagnet having an electromagnet assembly (5), characterized by: the transformer assembly (A) is connected with the electromagnet assembly (5) to form a loop, and a delayer (4) is arranged on the loop.

2. A time-delay action electromagnet as claimed in claim 1, wherein: the transformer assembly (A) comprises a primary winding (1) and a secondary winding (2) which are wound on the same transformer iron core (3);

the primary winding (1) is connected with a main circuit;

the secondary winding (2) is connected with the electromagnet assembly (5) through the time delay device (4).

3. A time-delay action electromagnet as claimed in claim 2, wherein: the secondary winding (2) is connected with the time delay device (4) in series or in parallel.

4. A time-delay action electromagnet as claimed in claim 2, wherein: the number of turns of the primary winding (1) is less than that of the secondary winding (2).

5. A time-lapse acting electromagnet as claimed in any one of claims 1 to 4, wherein: the delayer (4) is one or more of a capacitance charging type structure, an inductance time delay structure and a mechanical time delay structure.

6. A time delay acting electromagnet as claimed in claim 5, wherein: the electromagnet assembly (5) comprises a frame body (5.1) and an electromagnet coil (5.4) arranged in the frame body (5.1), and the electromagnet assembly acts through a movable iron core (5.2) which is arranged in the electromagnet coil (5.4) and can reciprocate on the frame body (5.1).

7. A time delay acting electromagnet as claimed in claim 5, wherein: the electromagnet assembly (5) is matched with a switch arranged on the main circuit, and the main circuit is opened by action when power frequency short-circuit current occurs in the main circuit.

8. A circuit breaker, characterized by: the time-delay action electromagnet of the claim 5 is adopted;

the main circuit is a circuit connected into the circuit breaker, and the electromagnet assembly (5) is linked with a tripping mechanism (9) arranged in the circuit breaker.

9. A circuit breaker according to claim 8, wherein: comprises an upper terminal (6), a fixed contact (10), a lower terminal (7) and a movable contact (11) which are mutually connected in series;

the mutual inductor assembly (5) is connected between the upper terminal (6) and the fixed contact (10) in series.

10. A circuit breaker according to claim 8, wherein: the tripping mechanism (9) is a poking rod type resettable structure.