CN113793785A - Tripping device of residual current circuit breaker - Google Patents
Tripping device of residual current circuit breaker Download PDFInfo
- Publication number
- CN113793785A CN113793785A CN202111094845.8A CN202111094845A CN113793785A CN 113793785 A CN113793785 A CN 113793785A CN 202111094845 A CN202111094845 A CN 202111094845A CN 113793785 A CN113793785 A CN 113793785A
- Authority
- CN
- China
- Prior art keywords
- tripping device
- permanent magnet
- yoke
- circuit breaker
- air gap
- 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.)
- Pending
Links
- 230000009471 action Effects 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000004907 flux Effects 0.000 description 7
- 230000005284 excitation Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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
-
- 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
- H01H71/02—Housings; Casings; Bases; Mountings
Landscapes
- Breakers (AREA)
Abstract
The invention provides a tripping device of a residual current circuit breaker, and belongs to the technical field of circuit breakers. The tripping device comprises a magnetic yoke at least provided with two supporting legs, a permanent magnet arranged in the magnetic yoke, a tripping device and a moving device for enabling the tripping device to move up and down; the tripping device at least covers the end surfaces of the two support legs of the magnet yoke and the upper end surface of the permanent magnet, an air gap I and an air gap III are sequentially formed between the tripping device and the end surfaces of the two support legs of the magnet yoke, an air gap II is formed between the tripping device and the upper end surface of the permanent magnet, and the tripping device is connected with the moving device; and a coil is wound on one leg of the magnetic yoke. The tripping device of the residual current circuit breaker provided by the invention has no polarity requirement on the coil, and the whole action current is reduced, thereby being more beneficial to protecting personal safety.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to a tripping device of a residual current circuit breaker.
Background
As is well known, a trip device and a permanent magnet based on a magnetic circuit are used as an actuator or a trip device for an electromagnetic residual current device independent of a main voltage. In most bistable actuators, the magnetic flux is thus generated by the permanent magnet in the first rest position and thus exerts a holding force on a movably mounted component, such as a movably mounted plunger or armature, so that the force of the spring is exerted on the stationary component in the first switching position. When fault current occurs, the coil generates magnetic flux opposite to that of the permanent magnet, so that the magnetic holding force is reduced, the movable plunger or the armature is separated from the static part under the action of the spring and moves to a second trigger position, and the plunger or the armature releases the switch lock immediately.
A very common embodiment has an open magnetic circuit with the moving element in the form of a hinged armature. They have a yoke, generally U-shaped, with a coil around one leg and a permanent magnet thereon. The yoke is covered at both ends by an armature which rotates around an axis. In the rest state, the armature is attracted to the free end of the yoke under the action of the spring. In the event of a fault current, the fault current in the coil produces a magnetic flux which opposes the magnetic flux in the permanent magnet and compensates it, so that the magnetic holding force of the yoke on the hinge armature is reduced, so that the hinge armature is pulled away from the two ends of the yoke by the spring and moves into a release position, in which the latch is unlocked by the hinge armature. Such magnetic release devices with a hinged armature system are described, for example, in DE10120573a1 and DE69727278T 2.
In all the currently known electromagnetic tripping devices for residual current protectors, the designed armature is opened in a rotary manner, so that most of the actions are determined to be related to the current direction of the coil, and for leakage currents with different polarities, the polarity of the coil needs to be regulated so as to weaken the magnetic flux in the direction of the permanent magnet, so that the tripping device is tripped. Therefore, a circuit design for making the voltage induced by the detection magnetic ring output to the trip coil after passing through the circuit device be a voltage of a predetermined polarity needs to be added between the detection magnetic ring and the trip device. This adds virtually to the cost and increases the risk of undesirable effects.
Disclosure of Invention
Accordingly, the present invention is directed to solve the above-mentioned shortcomings of the prior art, and therefore, the present invention provides a trip device of a residual current circuit breaker, which has no polarity requirement on a coil, and is characterized in that an action current becomes smaller as a whole, thereby being more conducive to protecting personal safety.
In order to achieve the purpose, the invention provides the following technical scheme:
a tripping device of a residual current circuit breaker comprises a magnetic yoke at least provided with two supporting legs, a permanent magnet arranged in the magnetic yoke, a tripping device and a moving device for enabling the tripping device to move up and down;
the permanent magnet is placed between the two legs of the magnetic yoke, and the distances from the axis of the permanent magnet to the end faces of the legs of the magnetic yoke are equal;
the tripping device at least covers the end surfaces of the two support legs of the magnet yoke and the upper end surface of the permanent magnet, an air gap I and an air gap III are sequentially formed between the tripping device and the end surfaces of the two support legs of the magnet yoke, an air gap II is formed between the tripping device and the upper end surface of the permanent magnet, and the tripping device is connected with the moving device;
a coil is wound on one leg of the magnetic yoke;
the magnetic yoke is a U-shaped magnetic yoke;
the moving device comprises a counter force spring acting above the tripping device;
the number of the counter force springs is at least one;
the tripping device is an armature;
the permanent magnet is magnetic steel;
the tripping device of the residual current circuit breaker moves up and down but not rotates under the action of the movement device, and realizes tripping action when moving up and suction action when moving down.
Preferably, the moving device includes reaction springs respectively disposed below both ends of the trip device.
Preferably, the number of the reaction springs below the two ends of the tripping device is at least one.
Preferably, the axis of the counterforce spring is equidistant from the longitudinal central plane of the magnetic steel.
Compared with the prior art, the invention has the following beneficial effects:
1. the tripping device of the residual current circuit breaker provided by the invention has no polarity requirement on the coil and no requirement on the direction of current, and the tripping device is adopted to avoid the dependence of the opening of the rotary armature on the direction of the current of the coil in the prior art.
2. The tripping device of the residual current circuit breaker integrally shows that the action current becomes smaller, and is more beneficial to protecting personal safety.
3. The tripping device of the residual current circuit breaker provided by the invention enables the tripping device to move up and down instead of rotating under the action of the movement device, realizes tripping action when moving up, realizes suction action when moving down, and gets rid of the dependence of the rotary tripping device adopted in the prior art on the current direction.
Drawings
FIG. 1 is a schematic view of a structure of a pull-in state according to an embodiment of the present invention;
FIG. 2 is a schematic view of a pull-in state structure according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of coil forward excitation;
FIG. 4 is a schematic view of the negative excitation of the coil;
FIG. 5 is a schematic structural view of the trip state of the present invention;
in the figure, 1 is a magnetic yoke, 11 is an air gap I, 12 is an air gap III, 2 is a permanent magnet, 21 is an air gap II, 3 is a tripping device, 4 is a counter force spring, and 5 is a coil.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 to 5, the present invention provides a trip device of a residual current circuit breaker, which is characterized by comprising a magnetic yoke 1 having at least two legs, a permanent magnet 2 disposed in the magnetic yoke 1, a trip device 3, and a moving device for moving the trip device 3 up and down;
the permanent magnet 2 is placed between the two legs of the magnetic yoke 1, and the distances from the axis of the permanent magnet 2 to the end faces of the legs of the magnetic yoke 1 are equal;
the tripping device 3 at least covers the end surfaces of the two support legs of the magnet yoke 1 and the upper end surface of the permanent magnet 2, an air gap I11 and an air gap III 12 are sequentially formed between the tripping device 3 and the end surfaces of the two support legs of the magnet yoke 1, an air gap II 21 is formed between the tripping device 3 and the upper end surface of the permanent magnet 2, and the tripping device 3 is connected with the moving device;
a coil 5 is wound on one leg of the magnetic yoke 1;
in the invention, when the tripping device 3 is attracted, the attraction magnetic force of the tripping device 3 is formed among the air gap I11, the air gap II 21 and the air gap III 12 by the magnetic force line provided by the permanent magnet 2 through the symmetrical magnetic circuit, and the common attraction of the air gap I11, the air gap II 21 and the air gap III 12 is greater than the elastic force of the counter-force spring 4, so that the tripping device 3 keeps attracted.
The magnetic yoke 1 is preferably a U-shaped magnetic yoke, and may also be a magnetic yoke with three legs, which can be selected by those skilled in the art according to actual needs;
the moving device comprises a counter-force spring 4 acting above the tripping device, and the tripping device is moved upwards by using the elasticity of the counter-force spring 4 to be positioned at a tripping position;
the number of the counter-force spring 4 is at least one, and the setting position is not limited, as long as the tripping device 3 can move up and down, and the tripping state and the suction state of the tripping device 3 are satisfied, for example: reaction springs can be arranged above the two ends of the tripping device 3;
the tripping device 3 is an armature;
the permanent magnet 2 is magnetic steel.
In another embodiment of the present invention, as shown in fig. 2, the moving device includes reaction springs 4 respectively disposed below two ends of the trip device 3, and the arrangement is to ensure that the trip device 3 can move upwards, to perform a trip operation, and to avoid a rotation phenomenon of the trip device 3.
In another embodiment of the present invention, as shown in fig. 2, the number of the reaction springs 4 below the two ends of the trip device 3 is at least one, and those skilled in the art can set the number of the reaction springs according to actual needs.
In the invention, the distance between the axis of the reaction spring 4 and the longitudinal central plane of the magnetic steel is equal.
According to the invention, the upper end face of the permanent magnet 2 arranged in the magnetic yoke 1 is not divided into north and south, when the current directions of the coils are different, at least one magnetic field between the air gap I11 and the air gap III 12 is weakened, and the attraction can not be kept under the action of the counter-force spring 4, so that the device is in a tripping position.
In the present invention, the magnetic field of the permanent magnet 2 flows through the yoke 1 and the armature and is divided into approximately the same 2 parts. Wherein, the armature is also acted by the counterforce spring 4 and moves upwards, but is sucked due to the magnetic field of the contact part of the armature and the magnetic yoke 1;
the acting force of the counterforce spring 4 is equivalent to be vertical and upward so as to give an upward force to the tripping device 3;
as shown in fig. 3-5, when a certain current flows through the coil 5, the magnetic field generated by the current and the magnetic field generated by the permanent magnet 2 respectively generate a superposition and a weakening performance on the two end faces of the armature and the yoke 1, the generated attraction force is reduced on the weakened side, because the elastic force of the counterforce spring 4 acts on the trip device, one end of the armature tilts, and after tilting, the side with the larger attraction force is weakened because the gap becomes larger, so that the two ends of the armature are simultaneously jacked up, and the trip action is completed.
To further illustrate the above conclusion, the present invention provides two embodiments of coil positive excitation and coil negative excitation;
as shown in fig. 3, a schematic diagram of coil positive excitation is shown, when the coil 5 is positively excited, magnetic lines of force generated by the coil 5 act on the left magnetic circuit to reduce magnetic flux, so that the attractive force at the air gap three 12 on the left is reduced, and when the attractive force at the air gap three 12 is smaller than the elastic force of the reaction spring 4, the armature acts under the action of the reaction spring 4 to complete a trip action.
As shown in fig. 4, a schematic diagram of negative excitation of the coil is shown, when the coil 5 is excited in a negative direction, magnetic lines of force generated by the coil 5 act on the left magnetic circuit to reduce magnetic flux, so that the attraction force at the air gap at the right side is reduced, and when the attraction force at the air gap at the position is smaller than the elastic force of the counter force spring 4, the armature acts under the action of the counter force spring 4 to complete a trip action.
According to the above principle, it can be known that whether the coil 5 is tripped or not is not related to the current direction of the coil, but only the current magnitude.
The principle of the suction state in the invention is as follows: when the tripping device 3 is attracted, attraction magnetic force of the attraction magnetic force is formed among the air gap I11, the air gap II 21 and the air gap III 12 through the magnetic lines of force provided by the permanent magnet 2 via the symmetrical magnetic circuits, and the common attraction of the air gap I11, the air gap II 21 and the air gap III is larger than the elastic force of the counter force spring 4, so that the tripping device 3 keeps attracted.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The tripping device of the residual current circuit breaker is characterized by comprising a magnetic yoke at least provided with two supporting legs, a permanent magnet arranged in the magnetic yoke, a tripping device and a moving device for enabling the tripping device to move up and down;
the permanent magnet is placed between the two legs of the magnetic yoke, and the distances from the axis of the permanent magnet to the end faces of the legs of the magnetic yoke are equal;
the tripping device at least covers the end surfaces of the two support legs of the magnet yoke and the upper end surface of the permanent magnet, an air gap I and an air gap III are sequentially formed between the tripping device and the end surfaces of the two support legs of the magnet yoke, an air gap II is formed between the tripping device and the upper end surface of the permanent magnet, and the tripping device is connected with the moving device;
a coil is wound on one leg of the magnetic yoke;
the magnetic yoke is a U-shaped magnetic yoke;
the moving device comprises a counter force spring acting above the tripping device;
the number of the counter force springs is at least one;
the tripping device is an armature;
the permanent magnet is magnetic steel;
the tripping device of the residual current circuit breaker moves up and down but not rotates under the action of the movement device, and realizes tripping action when moving up and suction action when moving down.
2. The trip unit of a residual current circuit breaker according to claim 1, wherein said movement means comprise counter-force springs respectively disposed below the two ends of said trip unit.
3. The trip unit of a residual current circuit breaker according to claim 2, wherein the number of counter springs under the two ends of said trip unit is at least one.
4. The trip device of a residual current circuit breaker according to claim 2, wherein the axis of said counter-force spring is equidistant from the longitudinal central plane of the magnetic steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111094845.8A CN113793785A (en) | 2021-09-17 | 2021-09-17 | Tripping device of residual current circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111094845.8A CN113793785A (en) | 2021-09-17 | 2021-09-17 | Tripping device of residual current circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113793785A true CN113793785A (en) | 2021-12-14 |
Family
ID=78878864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111094845.8A Pending CN113793785A (en) | 2021-09-17 | 2021-09-17 | Tripping device of residual current circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113793785A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3107982A1 (en) * | 1981-03-03 | 1982-09-16 | Brown, Boveri & Cie Ag, 6800 Mannheim | Magnetic trip device |
| CN1031000A (en) * | 1987-07-28 | 1989-02-08 | 梅兰日兰公司 | High sensitive electromagnetic trip device and manufacture method thereof |
| CN2153138Y (en) * | 1993-04-10 | 1994-01-12 | 余为骥 | Electromagnetic tripper |
| FR2697670A1 (en) * | 1992-11-04 | 1994-05-06 | Merlin Gerin | Non-polarised differential relay constituting mechanical actuator for triggering circuit breaker or differential relay - has magnetic circuit formed by ferromagnetic cylinder and movable contact bridge piece disposed parallel to transverse base piece |
| CN1427435A (en) * | 2001-12-20 | 2003-07-02 | 西门子公司 | Trip relay |
| CN1747097A (en) * | 2004-09-02 | 2006-03-15 | 施耐德电器工业公司 | Electromagnetic trip device and electrical switchgear apparatus comprising same |
| EP2793247A1 (en) * | 2013-04-15 | 2014-10-22 | ABB Technology AG | A device for detecting a difference between currents in an electric circuit |
| EP3624232A1 (en) * | 2018-09-12 | 2020-03-18 | Commissariat à l'Energie Atomique et aux Energies Alternatives | Device for blowing an electric arc by pressurised gas during a connection/disconnection between an output terminal of an electrochemical storage battery and a busbar |
-
2021
- 2021-09-17 CN CN202111094845.8A patent/CN113793785A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3107982A1 (en) * | 1981-03-03 | 1982-09-16 | Brown, Boveri & Cie Ag, 6800 Mannheim | Magnetic trip device |
| CN1031000A (en) * | 1987-07-28 | 1989-02-08 | 梅兰日兰公司 | High sensitive electromagnetic trip device and manufacture method thereof |
| FR2697670A1 (en) * | 1992-11-04 | 1994-05-06 | Merlin Gerin | Non-polarised differential relay constituting mechanical actuator for triggering circuit breaker or differential relay - has magnetic circuit formed by ferromagnetic cylinder and movable contact bridge piece disposed parallel to transverse base piece |
| CN2153138Y (en) * | 1993-04-10 | 1994-01-12 | 余为骥 | Electromagnetic tripper |
| CN1427435A (en) * | 2001-12-20 | 2003-07-02 | 西门子公司 | Trip relay |
| CN1747097A (en) * | 2004-09-02 | 2006-03-15 | 施耐德电器工业公司 | Electromagnetic trip device and electrical switchgear apparatus comprising same |
| EP2793247A1 (en) * | 2013-04-15 | 2014-10-22 | ABB Technology AG | A device for detecting a difference between currents in an electric circuit |
| EP3624232A1 (en) * | 2018-09-12 | 2020-03-18 | Commissariat à l'Energie Atomique et aux Energies Alternatives | Device for blowing an electric arc by pressurised gas during a connection/disconnection between an output terminal of an electrochemical storage battery and a busbar |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10825625B1 (en) | Kinetic actuator for vacuum interrupter | |
| US9203230B2 (en) | Line protection switch | |
| CN101393822A (en) | Electromagnetic actuator and switching device equipped with such an electromagnetic actuator | |
| JP2017076616A (en) | Direct current relay | |
| US11908651B2 (en) | Intelligent circuit breaker capable of automatically releasing and tripping in power failure | |
| CN100561631C (en) | The trip release device of circuit-breaker | |
| JP2019186162A (en) | Electromagnetic operation device for switch, and high speed input device, vacuum circuit breaker, and switchgear using the same | |
| US3040146A (en) | Permanent magnet actuator for electric devices | |
| CN112400209B (en) | Medium voltage circuit breaker with vacuum interrupter and drive device and method for operating a medium voltage circuit breaker | |
| EP4280247A1 (en) | High-voltage direct-current magnetic latching relay with sensitive response | |
| CN113793785A (en) | Tripping device of residual current circuit breaker | |
| JP2004342552A (en) | Switching device | |
| US12033822B2 (en) | Ultra-fast polarized relay for hybrid switching systems | |
| CN107564770B (en) | Power contactor with high mechanical impact resistance | |
| KR100955373B1 (en) | Hybrid current limiter using superconduction device | |
| CN218631798U (en) | Switch of direct current breaker and direct current breaker | |
| RU2545163C1 (en) | Vacuum circuit breaker | |
| CN105047491A (en) | Anti-pumping device of permanent-magnet operation mechanism | |
| RU2310941C1 (en) | Electromagnetic operating mechanism for high-voltage vacuum circuit breaker | |
| Shin et al. | Study of Arc Motion and Switching Performance in DC Magnetic Contactors | |
| CN218602356U (en) | Drive device for tripping device and circuit breaker | |
| US11935715B2 (en) | Electromagnetic drive unit for a switching device and switching device | |
| RU121642U1 (en) | BISTABLE ELECTROMAGNET OF THE DRIVE OF THE SWITCHING DEVICE | |
| WO2011144256A1 (en) | An actuator, circuit breaker and method therefor | |
| US11728114B2 (en) | Low-voltage switching device including an electromagnetic contact load support |
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 |