CN113471031B - Tripping device, residual current protection device and circuit system - Google Patents
Tripping device, residual current protection device and circuit system Download PDFInfo
- Publication number
- CN113471031B CN113471031B CN202010246505.1A CN202010246505A CN113471031B CN 113471031 B CN113471031 B CN 113471031B CN 202010246505 A CN202010246505 A CN 202010246505A CN 113471031 B CN113471031 B CN 113471031B
- Authority
- CN
- China
- Prior art keywords
- armature
- arm
- yoke
- magnetic
- magnetic field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/2418—Electromagnetic mechanisms combined with an electrodynamic current limiting mechanism
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/2418—Electromagnetic mechanisms combined with an electrodynamic current limiting mechanism
- H01H2071/2427—Electromagnetic mechanisms combined with an electrodynamic current limiting mechanism with blow-off movement tripping mechanism, e.g. electrodynamic effect on contacts trips the traditional trip device before it can unlatch the spring mechanism by itself
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
- H01H2083/201—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other abnormal electrical condition being an arc fault
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
Abstract
The embodiment of the application provides a tripping device, a residual current protection device and a circuit system, relates to the technical field of power electronic devices, and can reduce the influence of a magnetic field in the environment on an RCD (capacitor-coupled device) when the RCD works. The specific scheme comprises the following steps: the trip device may include: armature, yoke, permanent magnet, elastic element, coil and bracing piece. The coil is wound on the first arm of the magnetic yoke, and the permanent magnet is attached to the second arm of the magnetic yoke. One end of the supporting rod is movably connected with the pivot of the armature. The first end of the armature is connected to one end of the elastic element. The armature is transversely arranged on the first arm and the second arm of the magnetic yoke and is in contact with the first arm and the second arm of the magnetic yoke. The first arm of the magnetic yoke is close to the first end of the armature, and the second arm of the magnetic yoke is close to the pivot of the armature. When the coil receives residual current larger than a preset threshold value, the direction of an induced magnetic field generated by the coil is opposite to that of a magnetic field generated by the permanent magnet. Such that the armature is remote from the first and second arms of the yoke.
Description
Technical Field
The embodiment of the application relates to the technical field of power electronic devices, in particular to a tripping device, a residual current protection device and a circuit system.
Background
A Residual Current Device (RCD) is a circuit protector. The RCD is used to make and break a circuit connection between the main circuit and the circuit load. Specifically, when a residual current (or leakage current) exists in the main circuit and exceeds a preset threshold, the RCD may disconnect the circuit connection between the main circuit and the circuit load to protect the main circuit. The residual current is a current whose sum of current vectors of each phase line (including a neutral line) in a low-voltage distribution line of the circuit is not zero. For example, the RCD may be used to avoid single-phase electric shock accidents caused by leakage current in the main circuit, and the RCD may also be used to avoid fire and equipment burn accidents caused by leakage current in the main circuit. The RCD is widely used as a protector for a main circuit in various devices.
The working principle of the RCD for breaking the circuit connection between the main circuit and the circuit load is: the RCD may receive a residual current of the main circuit, which may cause a magnetic field change in the RCD. When the residual current exceeds a preset threshold value, the strength of a magnetic field generated by the residual circuit is increased, so that the RCD executes tripping action, and the circuit connection between the main circuit and the circuit load is disconnected, so as to protect the main circuit.
Wherein the RCD disconnecting the circuit connection is performed based on a magnetic field change in the RCD; however, the magnetic field in the RCD may be affected by magnetic fields generated by other devices or natural phenomena (e.g., lightning), thereby falsely triggering the RCD to perform a trip action. For example, in some scenarios, even if there is no residual current in the main circuit, the RCD may be affected by the magnetic field generated by other surrounding devices, thereby falsely triggering the RCD to perform a trip action. Thus, a power failure may occur, resulting in economic loss.
Disclosure of Invention
The embodiment of the application provides a tripping device, a residual current protection device and a circuit system, and can reduce the influence of a magnetic field in the environment on an RCD when the RCD works, so that the possibility of misoperation of the tripping device in the RCD is reduced.
In order to achieve the technical purpose, the following technical scheme is adopted in the application:
in a first aspect, the present application provides a trip device, which may include: armature, yoke, permanent magnet, elastic element, coil and bracing piece.
The coil is wound on the first arm of the magnetic yoke, and the permanent magnet is attached to the second arm of the magnetic yoke. One end of the support rod is movably connected with the pivot of the armature, and the pivot of the armature is close to the first end of the armature. The first end of the armature is connected to one end of the elastic element. The armature is transversely arranged on the first arm and the second arm of the magnetic yoke and is in contact with the first arm and the second arm of the magnetic yoke. The first arm of the magnetic yoke is close to the first end of the armature, and the second arm of the magnetic yoke is close to the pivot of the armature.
It will be appreciated that since the armature is disposed transversely above and in contact with the first and second arms of the yoke. That is, the yoke and the armature may form a closed circuit. The permanent magnet generates a magnetic field, and a closed loop is formed by the magnetic yoke and the armature; therefore, a magnetic circuit of the magnetic field exists in the yoke and the armature. The armature may be magnetized by the magnetic field generated by the permanent magnet. The magnetized armature may be referred to as a magnet, among other things.
Wherein, the direction of the magnetic circuit in the magnet (i.e. the magnetized armature) is the same as the direction of the magnetic circuit of the permanent magnet in the armature. However, the permanent magnets have magnetic paths in the first and second arms of the yoke in opposite directions. In this way, the magnetic pole of the contact point of the armature and the first arm of the yoke is made different from the magnetic pole of the contact point of the armature and the second arm of the yoke. For example, the magnetic pole of the contact point of the armature and the first arm of the yoke may be an N pole, and the magnetic pole of the contact point of the armature and the second arm of the yoke may be an S pole; alternatively, the magnetic pole of the contact point of the armature and the first arm of the yoke may be an S-pole, and the magnetic pole of the contact point of the armature and the second arm of the yoke may be an N-pole.
Wherein the first arm of the yoke is wound with a coil, and a residual current generated in the main circuit can be transmitted to the coil. When residual current exists in the main circuit, the residual current starts to enter the coil, so that an induction magnetic field is formed on the coil. The magnetic field intensity of the magnetic field is a vector, and the direction of the induced magnetic field generated by the coil is opposite to that of the magnetic field generated by the permanent magnet; therefore, the induced magnetic field generated by the coil and the magnetic field generated by the permanent magnet can be mutually offset due to the opposite directions of the magnetic fields, so that the magnetic field intensity of the combined magnetic field generated by the coil and the permanent magnet is smaller than that of the magnetic field generated by the permanent magnet. Therefore, when there is residual current in the main circuit, the induced magnetic field generated by the coil and the magnetic field generated by the permanent magnet act together on the yoke, and the attraction force of the contact point where the first arm of the yoke contacts with the armature may be weakened due to the weakening of the magnetic field strength of the magnetic field, and the attraction force of the contact point where the second arm of the yoke contacts with the armature may also be weakened.
When the coil receives residual current larger than a preset threshold value, the direction of an induced magnetic field generated by the coil is opposite to that of a magnetic field generated by the permanent magnet. Because the coil is wound on the first arm of the magnetic yoke, an induced magnetic field generated by the coil and a magnetic field generated by the permanent magnet act on the magnetic yoke together, so that the moment of the magnetic force generated by the first arm and the second arm of the magnetic yoke to the armature is smaller than the moment of the tensile force generated by the elastic element to the armature, and the armature is far away from the first arm and the second arm of the magnetic yoke.
It should be noted that the contact point of the armature and the first arm of the magnetic yoke is attracted to each other, and the contact point of the armature and the second arm of the magnetic yoke is attracted to each other. When other magnetic fields are present in the environment of the shedding device, the magnetic field influences the magnetic field of the contact point of the armature and the first arm and the second arm of the magnetic yoke differently due to the different magnetic poles of the contact point of the armature and the first arm and the second arm of the magnetic yoke.
For example, if the direction of the magnetic field in the environment is the same as the direction of the magnetic circuit in the first arm of the yoke, the attraction force of the contact point of the armature with the first arm of the yoke increases, and the attraction force of the contact point of the armature with the second arm of the yoke decreases. For another example, if the direction of the magnetic field in the environment is the same as the direction of the magnetic circuit in the second arm of the yoke, the attraction force of the contact point of the armature with the first arm of the yoke is weakened, and the attraction force of the contact point of the armature with the second arm of the yoke is strengthened. Since the fulcrum of the armature is located between the contact point of the armature and the second arm of the yoke and the first end of the armature. The magnetic field in the environment causes the moment of attraction of the contact point of the armature and the first arm of the magnetic yoke to increase, and the moment of attraction of the contact point of the armature and the second arm of the magnetic yoke to decrease.
In summary, for the armature as a whole, the armature is influenced by the magnetic field in the environment, the change of the overall attractive torque of the armature is small, and the armature does not get away from the first arm and the second arm of the yoke. Thus, the influence of the magnetic field in the environment on the tripping device can be reduced.
In one possible embodiment, the ratio of the distance from the contact point of the first arm of the yoke with the armature to the fulcrum to the distance from the contact point of the second arm of the yoke with the armature to the fulcrum is less than a preset threshold value.
The moment of the armature is related to the distance between the force point and the fulcrum, namely the moment of the magnetic yoke is related to the distance between the contact point of the first arm of the magnetic yoke and the armature and the fulcrum. The ratio of the distance from the contact point of the first arm of the yoke with the armature to the fulcrum to the distance from the contact point of the second arm of the yoke with the armature to the fulcrum can characterize the moment of the armature as a whole. The smaller the overall moment of attraction of the armature, the less the armature is influenced by the magnetic field in the environment.
In another possible embodiment, the trip device may further include a housing and a thimble. The shell is provided with an opening, the ejector pin is arranged at a position corresponding to the opening, and the ejector pin is connected to the armature. Wherein the ejector pin is ejected when the armature leaves a contact point of the first arm and the second arm of the magnetic yoke.
It will be appreciated that the ejector pin is ejected by the armature through the opening of the housing as the armature moves away from the first and second arms of the yoke.
In another possible embodiment, the distance between the point of contact of the armature and the point of contact of the armature with the second arm of the magnet yoke is greater than a predetermined distance value.
In another possible embodiment, the first end of the coil is connected to the positive pole of the main circuit and the second end of the coil is connected to the negative pole of the main circuit. The magnetic path direction of the induced magnetic field generated by the coil in the magnetic yoke is opposite to the magnetic path direction of the magnetic field generated by the permanent magnet in the magnetic yoke.
In another possible embodiment, the trip device may further include a bobbin. A bobbin is provided on the first arm of the yoke, and a coil is wound on the bobbin.
In another possible embodiment, the yoke has a U-shaped configuration, or the yoke has a V-shaped configuration.
In another possible embodiment, the elastic element is a spring.
In a second aspect, the present application further provides a residual current protection device, which may include the trip device, the residual current transformer and the actuator in the first aspect and any possible implementation manner thereof. The residual current transformer, the tripping device and the executing element are sequentially connected.
The residual current transformer is used for detecting residual current in the main circuit and transmitting the residual current to the tripping device. The tripping device is used for receiving the residual current, and when the residual current is larger than a preset threshold value, the tripping device acts to trigger the execution element. The actuator is triggered and outputs a mechanical opening and closing signal to the main circuit, wherein the mechanical opening and closing signal is used for closing a mechanical switch in the main circuit.
In a third aspect, the present application also provides a circuit system, which may include the residual current protection device of the second aspect, a main circuit and a circuit load.
It can be understood that, the beneficial effects that can be achieved by the circuit system provided by the third aspect and the residual current protection device provided by the second aspect can refer to the beneficial effects of the first aspect and any one of the possible embodiments thereof, and are not described herein again.
Drawings
Fig. 1 is a schematic structural diagram of a trip device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another trip device provided in the embodiment of the present application;
fig. 3 is a schematic view of an operating structure of a trip device according to an embodiment of the present disclosure;
fig. 4 is a schematic view of an operating structure of another trip device provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of another trip device according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a residual current protection device according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a circuit system according to an embodiment of the present disclosure.
Detailed Description
In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the 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 embodiment, "a plurality" means two or more unless otherwise specified.
The tripping device in the RCD is interfered by a magnetic field in the external environment, which may cause malfunction of the tripping device. Fig. 1 is a schematic structural diagram of a V-shaped trip device. As shown in fig. 1, the trip device includes a housing 10, a thimble 20, a coil 30, an armature 40, a spring 50, a magnetic steel 60, and a yoke 70. Wherein, coil 30 is wound on the first arm of yoke 70, and magnet steel 60 is attached on the second arm of yoke 70. The armature 40 is disposed transversely above and in contact with the first and second arms of the yoke 70. A contact point of the armature 40 with the first arm of the yoke 70 is referred to as a first attracting surface S1, a contact point of the armature 40 with the second arm of the yoke 70 is referred to as a second attracting surface S2, and a fulcrum P of the armature 40 is disposed next to the second attracting surface S2.
As shown in fig. 1, the armature 40 is disposed laterally above the first and second arms of the yoke 70 such that the armature 40 and the yoke 70 form a closed circuit. The magnetic steel 60 is made of a magnetic material and has magnetism. The magnetic field generated by the magnetic steel 60 may form a magnetic circuit in the yoke 70 and the armature 40, the magnetic circuit in the armature 40 causing the armature 40 to be magnetized. After the armature 40 is magnetized, the first attraction surface S1 and the second attraction surface S2 of the armature 40 are located at different magnetic poles. As shown in fig. 1, the first attraction surface of the armature 40 is an S pole, and the second attraction surface is an N pole. Since the fulcrum P of the armature is disposed next to the second attraction face S2, the second attraction face S2 provides almost no moment. Wherein, the moment is the product of the attraction force of the second attraction surface S2 and the attraction force of the second attraction surface S2 to the pivot P. If the armature 40 moves away from the first and second arms of the yoke 70, the trip mechanism trips. Assuming that an external magnetic field is present, the influence of the external magnetic field on the trip device can only be reduced by the first absorption surface S1. If the external magnetic field is strong or the change of the external magnetic field is large, the influence of the external magnetic field on the trip device cannot be weakened through the first absorption surface S1. Thus, the trip device is susceptible to the influence of an external magnetic field, and the trip device is prone to be mistakenly tripped.
In order to reduce the influence of the external magnetic field on the trip device, a ferromagnetic material can also be arranged in the interior of the trip device. If an external magnetic field exists around the tripping device, the ferromagnetic material is magnetized due to the field intensity of the external magnetic field, and the magnetic field intensity after the ferromagnetic material is magnetized and the external magnetic field are mutually offset, so that the interference of the external magnetic field on the tripping device can be reduced, and the possibility of false operation of the tripping device can be reduced. However, since ferromagnetic materials are generally magnetized, they are in a saturated state. That is, there is a certain limit to the shielding performance of the ferromagnetic material to the magnetic field in the environment, and when the influence of the external magnetic field by the ferromagnetic material is in a saturation state, the shielding performance of the ferromagnetic material to the magnetic field is reduced, and the external magnetic field can not be shielded any more. Therefore, when the external magnetic field is small, the ferromagnetic material is not in a saturation state under the action of the external magnetic field, or the ferromagnetic material is still about to be in a saturation state under the action of the external magnetic field. The induced magnetic field generated by the ferromagnetic material can shield the external magnetic field, the external magnetic field is weakened, and the external magnetic field cannot influence the tripping device.
It is understood that ferromagnetic materials are generally susceptible to saturation by magnetic fields, and the use of ferromagnetic materials has poor shielding properties against external magnetic fields. Therefore, the ferromagnetic material can shield an external magnetic field having a small magnetic field strength. If the magnetic field intensity of the external magnetic field is larger, the external magnetic field still influences the tripping device, so that the tripping device is mistakenly tripped.
The embodiment of the application provides a tripping device, which can reduce the influence of a magnetic field in the environment on the tripping device, thereby reducing the possibility of misoperation of the tripping device. The influence of a small magnetic field on the tripping device in the environment can be shielded, and the influence of a larger magnetic field on the tripping device can also be shielded. The tripping device is characterized in that the fulcrum is arranged at a position of a certain distance away from the second attraction surface, so that the first attraction surface and the second attraction surface have moments. The first attraction surface and the second attraction surface can act together, so that the influence of a magnetic field in the environment on the tripping device can be reduced.
Please refer to fig. 2, which illustrates a trip apparatus according to an embodiment of the present disclosure. As shown in fig. 2, the trip device includes: the ejector pin 200 is fixed to the housing 100, the armature 300 is fixed to the yoke 400, the permanent magnet 500 is fixed to the elastic member 600, the coil 700 is fixed to the support rod 800.
An opening is provided in the housing 100, and the thimble 200 is connected to the armature 300 through the opening. The armature 300, the yoke 400, the permanent magnet 500, the elastic member 600, the coil 700, and the support rod 800 are disposed inside the case 100. The coil 700 is wound around the first arm of the yoke 400, and the permanent magnet 500 is attached to the second arm of the yoke 400. One end of the support rod 800 is movably connected to the pivot point P of the armature 300, and the pivot point P of the armature 300 is close to the first end of the armature 300. A first end of the armature 300 is connected to one end of the elastic member 600. The other end of the elastic member 600 and the other end of the supporting rod 800 are fixedly coupled to the case 100, or the other end of the elastic member 600 and the other end of the supporting rod 800 are fixedly coupled to the yoke 400. The armature 300 is transversely disposed on the first and second arms of the yoke 400, and contacts the first and second arms of the yoke 400. A first arm of the yoke 400 is proximate to a first end of the armature 300 and a second arm of the yoke 400 is proximate to a pivot point P of the armature 300.
Wherein the armature 300 is disposed above and in contact with the first and second arms of the yoke 400. The permanent magnet 500 generates a magnetic field, and the yoke and the armature may form a closed circuit, and thus, a magnetic circuit of the magnetic field exists in the yoke and the armature. A contact point of the armature 300 and the first arm of the yoke 400 is a first attraction surface S1, and a contact point of the armature 300 and the second arm of the yoke 400 is a second attraction surface S2. The armature 300 and the yoke 400 form a closed circuit. The magnetic field strength generated by the permanent magnet 500 may have a magnetic path in a closed circuit formed by the yoke 300 and the armature 400. And, the magnetic circuit of the permanent magnet 500 passes through the armature 300, and the armature 300 is magnetized by the magnetic field of the permanent magnet 500.
Illustratively, as in fig. 2, the N pole of the permanent magnet 500 is close to the second attraction surface S2. The armature 300 becomes a magnet after being magnetized by the magnetic field of the permanent magnet 500, the first attraction surface S1 of the armature 300 is the N pole of the magnet, and the second attraction surface S2 of the armature 300 is the S pole of the magnet. If the S pole of the permanent magnet 500 is close to the second attraction surface S2, the first attraction surface S1 of the armature 300 is the S pole of the magnet, and the second attraction surface S2 of the armature 300 is the N pole of the magnet.
The first arm of the yoke 400 has a coil 700 wound thereon when a residual current is present in the coil 700. Illustratively, a first end of the coil 700 is connected to a positive pole of the main circuit and a second end of the coil 700 is connected to a negative pole of the main circuit. Based on the principle of electromagnetic induction, changes in residual current can produce a magnetic field. Wherein the direction of the magnetic path of the induced magnetic field generated from the coil 700 in the yoke 400 is opposite to the direction of the magnetic path of the magnetic field generated from the permanent magnet 500 in the yoke 400. For example, the direction of winding the coil is as shown in fig. 2, the residual current flows into the coil from the first end of the coil (the arrow in the coil indicates the direction of the current), and the N pole of the permanent magnet 500 is close to the second attraction surface S2. The direction of the magnetic field intensity generated by the coil on the first arm of the magnetic yoke is opposite to the direction of the magnetic circuit of the permanent magnet on the first arm of the magnetic yoke, and the magnetic field intensity formed by the permanent magnet can be weakened by an induced magnetic field formed by residual current in the coil. Therefore, the attractive force at the first attraction surface S1 where the first arm of the yoke contacts the armature is weakened, and the attractive force at the second attraction surface S2 where the second arm of the yoke contacts the armature is weakened. If and only if the moment on the left side of the armature fulcrum is smaller than the moment on the right side of the armature fulcrum, the armature leaves the magnetic yoke under the action of the pulling force of the spring, the ejector pin is ejected out through the opening in the shell, and the tripping device is triggered.
In some embodiments, to ensure that the coil is wound around the first arm of the yoke, the magnetic circuit in the yoke does not induce current in the coil. A coil former may be provided on the first arm of the yoke, and the coil may be wound on the coil former.
It should be noted that, according to the electromagnetic induction principle, when the directions of the residual currents in the coils are different, the direction of the magnetic field intensity generated by the coil on the first arm of the magnetic yoke is also different from the direction of the magnetic circuit of the permanent magnet on the first arm of the magnetic yoke. Therefore, when winding the coil on the first arm of the yoke, it is necessary to ensure that the magnetic path direction of the magnetic field formed by the residual current in the coil in the yoke is opposite to the magnetic path direction of the permanent magnet in the yoke.
If the coil receives the residual current which is larger than the preset threshold value, the magnetic field intensity of an induction magnetic field formed in the coil by the residual current is larger than that generated by the permanent magnet. The magnetic field generated by the permanent magnet and the induction magnetic field generated by the coil act on the magnetic yoke together, so that the moment of the magnetic force generated by the first arm and the second arm of the magnetic yoke to the armature is smaller than the moment of the tensile force generated by the elastic element to the armature, and the armature is far away from the first arm and the second arm of the magnetic yoke. Wherein the fulcrum of the armature supports the armature as a pivot point during the process in which the armature leaves the first arm and the second arm of the yoke.
It will be appreciated that the amount of distance between the fulcrum in the armature and the second attraction surface S2 will affect the moment to the left of the fulcrum of the armature. For example, in order to ensure that the moment between the second attraction surface S2 and the fulcrum may also affect the moment on the left side of the fulcrum of the armature, the distance between the fulcrum of the armature and the second attraction surface S2 of the armature is greater than the preset distance. Here, the preset distance value may be adaptively set according to the length of the armature, and for example, the preset distance value may be 5cm,10cm, etc.
When the armature leaves the first arm and the second arm of the magnetic yoke, the ejector pin is ejected in the process of changing the position of the armature, wherein the ejector pin can be ejected through the opening in the shell.
The magnetic field effect on the contact points of the armature with the first and second arms of the yoke is different when other magnetic fields are present in the environment. For example, if the direction of the magnetic field in the environment is the same as the direction of the magnetic circuit in the first arm of the yoke, the attraction force at the contact point of the armature with the first arm of the yoke increases, and the attraction force at the contact point of the armature with the second arm of the yoke decreases. The fulcrum of the armature is located between the contact point of the armature and the second arm of the yoke and the first end of the armature. The magnetic field in the environment increases the moment of attraction of the contact point of the armature and the first arm of the magnetic yoke, so that the moment of attraction of the contact point of the armature and the second arm of the magnetic yoke is reduced.
Illustratively, the direction of the interfering magnetic field present in the environment is shown in fig. 3, the direction of the interfering magnetic field is from top to bottom, and the direction of the magnetic circuit in the armature is from left to right. Then, the disturbing magnetic field acts on the first attraction surface S1 to increase the attraction force of the first attraction surface, and the disturbing magnetic field acts on the second attraction surface S2 to decrease the attraction force of the second attraction surface. That is, the force between the contact point of the armature and the first arm of the yoke is increased, and the force between the contact point of the armature and the second arm of the yoke is decreased. The left side of the armature fulcrum can be determined by the ratio of the distance L between the first attraction surface S1 and the fulcrum to the distance Y between the second attraction surface S2 and the fulcrum, namely L/Y. For example, the smaller the value of L/Y, the stronger the trip unit's ability to shield external magnetic fields. Under the influence of the disturbing magnetic field as shown in fig. 3, the armature in the trip device does not leave the first arm and the second arm of the magnetic yoke, i.e. the trip device does not trip.
As another example, the direction of the interference magnetic field existing in the environment is shown in fig. 4, the direction of the interference magnetic field is from bottom to top, and the direction of the magnetic circuit in the armature is from left to right. Then, the effect of the disturbing magnetic field on the first attraction surface S1 is to weaken the attraction force of the first attraction surface, and the effect of the disturbing magnetic field on the second attraction surface S2 is to strengthen the attraction force of the second attraction surface. That is, the force between the contact point of the armature and the first arm of the yoke is weakened and the force between the contact point of the armature and the second arm of the yoke is strengthened. The left side of the armature fulcrum can be determined by the ratio of the distance L between the first suction surface S1 and the fulcrum to the distance Y between the second suction surface S2 and the fulcrum. Under the influence of the disturbing magnetic field as shown in fig. 4, the armature in the trip device does not leave the first arm and the second arm of the magnetic yoke, i.e. the trip device does not trip.
In summary, the moment to the left of the fulcrum of the armature changes due to the change in the position of the fulcrum of the armature. On the whole armature, the armature is influenced by a magnetic field in the environment, the change of the overall suction torque of the armature is small, and the armature does not get away from the first arm and the second arm of the magnetic yoke. Thus, the influence of the magnetic field in the environment on the tripping device is reduced, and the possibility of misoperation of the tripping device in the RCD is also reduced.
In some embodiments, the structure of the magnetic yoke may be a U-shaped structure as shown in fig. 4, or may be a V-shaped structure. Wherein the structure of the yoke may be an irregular shape having an opening. As shown in fig. 5, the shape of the yoke is irregular, the first arm of the yoke is wound with a coil, the second arm of the yoke is attached with a permanent magnet, the yoke further comprises a connecting shaft connecting the first arm and the second arm, and the second arm of the yoke is connected with the armature through the connecting part.
It is understood that, in the embodiments of the present application, the shape of the yoke does not affect the technical effect of the present application, and therefore, the shape of the yoke may be specifically configured according to a specific circuit structure, which is only an example here.
Referring to fig. 6, an embodiment of the present application further provides a residual current protection device. As shown in fig. 6, the residual current protection device includes: trip device 41, residual current transformer 42 and actuator 43. Wherein, the residual current transformer 42, the tripping device 41 and the actuating element 43 are connected in sequence.
The residual current transformer 42 is used for detecting the residual current in the main circuit and transmitting the residual current to the tripping device 41.
The trip device 41 is configured to receive a residual current, and when the residual current is greater than a preset threshold, the trip device operates to trigger the actuator.
The actuator 43 is triggered and outputs a mechanical opening and closing signal to the main circuit, wherein the mechanical opening and closing signal is used for closing a mechanical switch in the main circuit.
In some embodiments, the residual current protection device may further include a current amplifier, and the current amplifier may be disposed between the residual current transformer and the trip device. The current amplifier can receive the residual current detected in the residual current transformer and amplify the current of the residual current. The current amplifier may transmit the current after the current amplification to the trip device.
As shown in fig. 7, the embodiment of the present application further provides a circuit system. The circuitry may include a residual current protection device 71, a main circuit 72 and a circuit load 73. The main circuit 72 is connected to a circuit load 73, a residual current protection device 71 is arranged on the main circuit, and the residual current protection device 71 is used for detecting residual current in the main circuit. When the residual current in the main circuit 72 is greater than the preset threshold, the residual current protection device 71 sends out a mechanical opening and closing signal, and the mechanical opening and closing signal is used for closing a mechanical switch in the main circuit.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, that is, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the methods described in the embodiments of the present application.
The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A trip device, comprising: the permanent magnet motor comprises an armature, a magnetic yoke, a permanent magnet, an elastic element, a coil and a supporting rod;
the coil is wound on the first arm of the magnetic yoke, and the permanent magnet is attached to the second arm of the magnetic yoke;
one end of the supporting rod is movably connected with a fulcrum of the armature, and the fulcrum of the armature is close to the first end of the armature; the first end of the armature is connected with one end of the elastic element;
the armature is transversely arranged on the first arm and the second arm of the magnetic yoke and is in contact with the first arm and the second arm of the magnetic yoke; the first arm of the magnetic yoke is close to the second end of the armature, and the second arm of the magnetic yoke is close to the pivot of the armature; the ratio of the distance from the contact point of the first arm of the magnetic yoke and the armature to the fulcrum to the distance from the contact point of the second arm of the magnetic yoke and the armature to the fulcrum is smaller than a preset threshold value;
when the coil receives residual current larger than the preset threshold value, the direction of an induced magnetic field generated by the coil is opposite to that of a magnetic field generated by the permanent magnet, the induced magnetic field generated by the coil and the magnetic field generated by the permanent magnet act on the magnetic yoke, so that the moment of the suction force generated by the first arm of the magnetic yoke and the second arm of the magnetic yoke to the armature is smaller than the moment of the tensile force of the elastic element to the armature, and the armature is separated from the first arm and the second arm of the magnetic yoke.
2. The trip unit of claim 1, further comprising a housing and a thimble;
the shell is provided with an opening, the ejector pin is arranged at a position corresponding to the opening, and the ejector pin is connected to the armature; wherein the ejector pin is ejected when the armature leaves the first arm and the second arm of the magnetic yoke.
3. The trip device of claim 1, wherein a distance between a fulcrum of the armature and a contact point of the armature and the second arm of the yoke is greater than a preset distance value.
4. The trip device according to any one of claims 1-3, wherein a first end of said coil is connected to a positive pole of a main circuit and a second end of said coil is connected to a negative pole of said main circuit;
the magnetic path direction of the induced magnetic field generated by the coil in the magnetic yoke is opposite to the magnetic path direction of the magnetic field generated by the permanent magnet in the magnetic yoke.
5. The trip unit of any of claims 1-3, further comprising a coil former;
the bobbin is disposed at the first arm of the yoke, and the coil is wound on the bobbin.
6. Trip unit according to any of claims 1-3, characterized in that the yoke is of a U-shaped configuration or that the yoke is of a V-shaped configuration.
7. Trip device according to any of claims 1-3, characterized in that the resilient element is a spring.
8. A residual current protection device, characterized in that it comprises a trip device according to any one of claims 1 to 7, a residual current transformer and an actuator, said residual current transformer, said trip device and said actuator being connected in series;
the residual current transformer is used for detecting residual current in the main circuit and transmitting the residual current to the tripping device;
the tripping device is used for receiving the residual current, and when the residual current is greater than a preset threshold value, the tripping device acts to trigger the execution element;
the actuator is triggered, and the actuator outputs a mechanical opening and closing signal to the main circuit, wherein the mechanical opening and closing signal is used for closing a mechanical switch of the main circuit.
9. A circuit system comprising a residual current protection device as claimed in claim 8, a main circuit and a circuit load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010246505.1A CN113471031B (en) | 2020-03-31 | 2020-03-31 | Tripping device, residual current protection device and circuit system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010246505.1A CN113471031B (en) | 2020-03-31 | 2020-03-31 | Tripping device, residual current protection device and circuit system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113471031A CN113471031A (en) | 2021-10-01 |
| CN113471031B true CN113471031B (en) | 2022-12-30 |
Family
ID=77865663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010246505.1A Active CN113471031B (en) | 2020-03-31 | 2020-03-31 | Tripping device, residual current protection device and circuit system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113471031B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201936827U (en) * | 2011-02-22 | 2011-08-17 | 宏达电器集团有限公司 | Residual current operated circuit breaker |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041970C (en) * | 1994-02-28 | 1999-02-03 | 断路器工业有限公司 | Low energy shunt trip |
| CN203386689U (en) * | 2013-07-23 | 2014-01-08 | 浙江威利坚电器有限公司 | Electromagnetic release |
| CN103839735B (en) * | 2013-12-23 | 2016-08-17 | 上海良信电器股份有限公司 | A kind of magnetictrip magnetic structure |
| CN204732363U (en) * | 2015-06-18 | 2015-10-28 | 常州三恒电器有限公司 | Release |
| CN205028872U (en) * | 2015-09-15 | 2016-02-10 | 北京Abb低压电器有限公司 | Low pressure electromagnetic type release |
| CN206322645U (en) * | 2016-11-17 | 2017-07-11 | 浙江正泰电器股份有限公司 | Electromagnetic relay |
| CN109637909B (en) * | 2018-12-19 | 2024-05-03 | 温州云鲲智能电气有限公司 | Tripping power mechanism directly driven by residual current and debugging method thereof |
| CN209232704U (en) * | 2019-01-22 | 2019-08-09 | 浙江明晖智能电气有限公司 | Convenient for the breaker earth leakage protective magnetictrip of balanced armature |
| CN209929252U (en) * | 2019-05-28 | 2020-01-10 | 冯伟通 | Electromagnetic tripping mechanism and leakage protection circuit breaker with same |
-
2020
- 2020-03-31 CN CN202010246505.1A patent/CN113471031B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201936827U (en) * | 2011-02-22 | 2011-08-17 | 宏达电器集团有限公司 | Residual current operated circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113471031A (en) | 2021-10-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7088207B2 (en) | Electrical switching device for fault-current, overcurrent and short-circuit current position | |
| US4641117A (en) | Combined accessory and trip actuator unit for electronic circuit breakers | |
| EP3748662A1 (en) | Kinetic actuator for vacuum interrupter | |
| US20220028643A1 (en) | Intelligent circuit breaker capable of automatically releasing and tripping in power failure | |
| US9203230B2 (en) | Line protection switch | |
| CA2802595C (en) | Overload relay switch without springs | |
| BG104551A (en) | Electromagnetic switch | |
| CN113471031B (en) | Tripping device, residual current protection device and circuit system | |
| CN102231462B (en) | Leakage protection plug | |
| US9697973B2 (en) | Structure electromagnetic relay containing permanent magnet | |
| CN201966456U (en) | Electric leakage protection plug | |
| CN101609769B (en) | Positive and negative pulse excitation actuating mechanism of grounding fault breaker | |
| CN102347176A (en) | Working method of electromagnetic tripping device | |
| CN110047691B (en) | Power isolating switch and power wiring isolating device | |
| CN105047491A (en) | Anti-pumping device of permanent-magnet operation mechanism | |
| CN201230077Y (en) | Leakage protection plug | |
| US11355914B2 (en) | Relay protection | |
| CN208298775U (en) | Earth leakage circuit breaker | |
| CN2153138Y (en) | Electromagnetic tripper | |
| KR200212855Y1 (en) | Electronic trip coil mechanism of circuit breaker | |
| CN212750782U (en) | Magnetic protection module of switch device | |
| CN212625451U (en) | Anti-interference permanent magnet release | |
| CN212991017U (en) | Small electromagnetic leakage circuit breaker with time delay function | |
| CN205028872U (en) | Low pressure electromagnetic type release | |
| CN205194636U (en) | Permanent magnetism operating device anti -bouncing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |