CN112908798A - Annular magnetic shield and low-voltage direct-current circuit breaker using same - Google Patents
Annular magnetic shield and low-voltage direct-current circuit breaker using same Download PDFInfo
- Publication number
- CN112908798A CN112908798A CN202110134491.9A CN202110134491A CN112908798A CN 112908798 A CN112908798 A CN 112908798A CN 202110134491 A CN202110134491 A CN 202110134491A CN 112908798 A CN112908798 A CN 112908798A
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- China
- Prior art keywords
- cover wall
- annular magnetic
- circuit breaker
- shield
- wall
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- 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.)
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Links
- 238000004880 explosion Methods 0.000 claims abstract 6
- 210000002421 cell wall Anatomy 0.000 claims 1
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 239000000696 magnetic material Substances 0.000 claims 1
- 239000004020 conductor Substances 0.000 abstract description 4
- 206010017076 Fracture Diseases 0.000 description 12
- 208000010392 Bone Fractures Diseases 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 208000006670 Multiple fractures Diseases 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
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- 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
Abstract
The invention discloses an annular magnetic shield, which comprises a first shield wall and a second shield wall which are oppositely arranged, wherein two ends of the first shield wall are respectively connected with two ends of the second shield wall to form an annular structure, a gap is formed between the first shield wall and the second shield wall, the first shield wall and the second shield wall are jointly bent along an S shape to form more than two accommodating grooves, the groove walls of the accommodating grooves are respectively formed by the first shield wall or the second shield wall, and the first shield wall and the second shield wall are both made of magnetic conductive materials. The invention also discloses a low-voltage direct current circuit breaker using the annular magnetic shield. Its purpose is in order to provide an annular magnetic shield cover and use its low pressure direct current circuit breaker, and this annular magnetic shield cover is applied to low pressure direct current circuit breaker's explosion chamber, makes the explosion chamber have the magnetic screen function to avoid the circuit breaker to produce the side burning when breaking, make the circuit breaker can break safely effectively.
Description
Technical Field
The invention relates to the field of circuit breakers, in particular to a magnetic shielding device for a low-voltage direct-current circuit breaker and a circuit breaker using the magnetic shielding device.
Background
The low-voltage direct-current circuit breaker is one of the most important components in a low-voltage direct-current power distribution system, and is widely applied to important power stations, substations, communication base stations, data centers and the like. The safety of key departments such as a power system, communication and the like is ensured by the stable and reliable operation of the system. In addition, the low-voltage direct-current circuit breaker is also widely applied to urban rail transit systems, ship power systems and emerging photovoltaic systems, so that the safety of power distribution systems, electric equipment and the safety of the photovoltaic systems are ensured.
Unlike industrial frequency current, direct current has no natural zero crossing point, and arc extinguishing and regulation are much more difficult than the situation of switching on and off alternating current in the switching on and off process of direct current. The high-performance switching on and off of the low-voltage direct-current air arc becomes one of the research hot problems in the field of low-voltage electrical appliances. The direct current breaking method comprises a current limiting method, a forced zero-crossing method and a mechanical-electric-electronic hybrid switching method. The energy consumption current limiting is realized by continuously increasing the arc voltage, while the working voltage of a single fracture of a common low-voltage direct-current circuit breaker can only reach DC 200-300V generally, so that the working voltage of the single fracture is increased by adopting a method of connecting multiple fractures in series, and further the direct-current cut-off is realized.
As shown in fig. 1 and 2, for the multi-fracture technical solution, the requirement on the synchronism between the contacts of the multi-fracture is high during the breaking, and the voltages shared by the fractures are consistent, and meanwhile, because the multi-fracture adopts a connection mode of electrical series connection and physical position parallel connection, when the breaking, a direct current arc of one fracture is subjected to the lateral magnetic blow action of the bypass fracture to generate side burning, and the lateral magnetic blow is generated by the action of the electric arc power between the fractures, so that the burning energy of each fracture is different, the contact and the arc-extinguishing grid plate are burned seriously, and the breaking fails.
Disclosure of Invention
The invention aims to solve the technical problem of providing an annular magnetic shielding cover and a low-voltage direct-current circuit breaker using the same.
The annular magnetic shield comprises a first shield wall and a second shield wall which are oppositely arranged, wherein two ends of the first shield wall are respectively connected with two ends of the second shield wall to form an annular structure, a gap is formed between the first shield wall and the second shield wall, the first shield wall and the second shield wall are jointly bent along an S shape to form more than two accommodating grooves, the groove walls of the accommodating grooves are respectively formed by the first shield wall or the second shield wall, and the first shield wall and the second shield wall are both made of magnetic conductive materials.
In the annular magnetic shield, the first shield wall and the second shield wall are both rectangular, and the first shield wall and the second shield wall are bent in the length direction of the first shield wall and the second shield wall together along an S shape to form more than two accommodating grooves.
In the ring-shaped magnetic shield case of the present invention, the accommodating groove is provided in three or four.
The low-voltage direct-current circuit breaker using the annular magnetic shielding cover comprises a base, wherein more than two arc extinguishing chambers are arranged in parallel in an inner cavity of the base, the annular magnetic shielding cover is arranged on the periphery of each arc extinguishing chamber, the number of the arc extinguishing chambers and the number of the accommodating grooves are the same, the arc extinguishing chambers and the accommodating grooves are arranged in a one-to-one correspondence mode, and each arc extinguishing chamber is located in the corresponding accommodating groove.
The low-voltage direct current circuit breaker is characterized in that the annular magnetic shielding cover is cast in the base.
In the low-voltage direct-current circuit breaker, the number of the arc extinguish chambers and the number of the accommodating grooves are three or four.
The annular magnetic shield cover and the low-voltage direct-current circuit breaker using the same are different from the prior art in that the annular magnetic shield cover is of an annular structure made of a magnetic conduction material, the first cover wall and the second cover wall are bent together along an S shape to form more than two accommodating grooves, when the annular magnetic shield cover is used, the annular magnetic shield cover is arranged on the periphery of an arc extinguish chamber of the low-voltage direct-current circuit breaker, the number of the accommodating grooves and the number of the arc extinguish chambers are the same, the accommodating grooves and the arc extinguish chambers are arranged in a one-to-one correspondence mode. For each arc chute, the annular magnetic shield can shield the interference of the magnetic field around the annular magnetic shield. Therefore, the invention can avoid the side burning of the breaker when the breaker is cut off, so that the breaker can be safely and effectively cut off.
The invention will be further explained with reference to the drawings.
Drawings
Fig. 1 is a schematic diagram of a four-break series connection of a low-voltage dc circuit breaker in the prior art;
fig. 2 is a schematic diagram of a three-break series connection of a low-voltage dc circuit breaker in the prior art;
fig. 3 is a schematic structural diagram of a low-voltage dc circuit breaker according to the present invention;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a schematic view of a base according to the present invention;
FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;
FIG. 7 is a schematic view of the construction of the ring-shaped magnetic shield of the present invention;
FIG. 8 is an enlarged view of a portion of FIG. 7 at C;
fig. 9 is a magnetic shield schematic diagram of the ring-shaped magnetic shield case of the present invention.
Detailed Description
As shown in fig. 7 in combination with fig. 8, the annular magnetic shield 09 of the present invention includes a first shield wall 091 and a second shield wall 092 which are disposed opposite to each other, the first shield wall 091 and the second shield wall 092 are disposed in parallel, both ends of the first shield wall 091 are respectively connected to both ends of the second shield wall 092 to form an annular structure, and a gap 093 is provided between the first shield wall 091 and the second shield wall 092. The first cover wall 091 and the second cover wall 092 are bent together along the S-shape to form two or more accommodating grooves 094, and the groove walls of the accommodating grooves 094 are both formed by the first cover wall 091 or the second cover wall 092, in this embodiment, the groove walls of the accommodating grooves 094 are both formed by the first cover wall 091, that is, the accommodating grooves 094 are located on the same side of the annular magnetic shield 09. The first and second walls 091, 092 are made of magnetic conductive material.
As shown in fig. 7, in the annular magnetic shield 09 of the present invention, the first shield wall 091 and the second shield wall 092 each have a rectangular parallelepiped shape, and the first shield wall 091 and the second shield wall 092 each have a certain thickness. The first and second cover walls 091 and 092 are bent in an S-shape in the longitudinal direction to form two or more accommodating grooves 094.
In the ring-shaped magnetic shield 09 of the present invention, the holding grooves 094 are provided in three or four. As shown in fig. 7, in the present embodiment, the housing grooves 094 are provided in four to match with a low-voltage dc circuit breaker provided with four arc extinguishing chambers 06.
As shown in fig. 3 and in combination with fig. 4-6, the low-voltage dc circuit breaker using the annular magnetic shielding cover 09 in the present invention includes a base 01, wherein an inner cavity of the base 01 is provided with two or more arc-extinguishing chambers 06 arranged side by side, the annular magnetic shielding cover 09 is disposed on a periphery of the arc-extinguishing chambers 06, the number of the arc-extinguishing chambers 06 and the number of the accommodating grooves 094 are the same, the arc-extinguishing chambers 06 and the accommodating grooves 094 are arranged in a one-to-one correspondence manner, and each arc-extinguishing chamber 06 is located in the corresponding accommodating groove 094. The annular magnetic shield 09 is located at the same level and height position as the arc extinguishing chamber 06 in the circuit breaker, and surrounds the arc extinguishing chamber 06.
As shown in fig. 4 and fig. 6, the annular magnetic shield 09 is poured into the base 01, specifically, into the upper end of the base 01, so that the periphery of the annular magnetic shield 09 is isolated by the insulating material. Note that, after the annular magnetic shield 09 is cast inside the base 01, a gap 093 still exists between the first shield wall 091 and the second shield wall 092 of the annular magnetic shield 09.
The arc extinguishing chamber 06 and the accommodating groove 094 are three or four in number, as shown in fig. 3 and in combination with fig. 5 and 6, in this embodiment, the arc extinguishing chamber 06 and the accommodating groove 094 are four in number.
As shown in fig. 3 and in conjunction with fig. 4-6, the low-voltage dc circuit breaker of the present invention further includes a static conducting system 02, a dynamic conducting system 03, a magnetic tripping system 04, a rotating shaft 05, an operating mechanism 07, and a housing 08. The static conductive system 02, the dynamic conductive system 03, the rotating shaft 05, the operating mechanism 07, the magnetic tripping system 04 and the arc extinguish chamber 06 are arranged in the inner cavity of the base 01, the housing 08 is arranged on the upper part of the base 01, and the arc extinguish chamber 06 is arranged at the upper ends of the static conductive system 02 and the dynamic conductive system 03. The components of the low-voltage dc circuit breaker belong to the prior art, and detailed descriptions of the specific structure and the working principle thereof are omitted.
The annular magnetic shield cover and the low-voltage direct-current circuit breaker using the same are different from the prior art in that the annular magnetic shield cover 09 is of an annular structure made of a magnetic conductive material, the first cover wall 091 and the second cover wall 092 are bent together along an S shape to form more than two accommodating grooves 094, when the annular magnetic shield cover 09 is used, the annular magnetic shield cover 09 is placed on the periphery of an arc extinguish chamber 06 of the low-voltage direct-current circuit breaker, the number of the accommodating grooves 094 is the same as that of the arc extinguish chambers 06, the accommodating grooves 094 are arranged in a one-to-one correspondence manner, and each arc extinguish chamber 06. For each arc chute 06, an annular magnetic shield 09 is able to shield the magnetic field surrounding it from interference. Therefore, the invention can avoid the side burning of the breaker when the breaker is cut off, so that the breaker can be safely and effectively cut off.
As shown in fig. 9, the magnetic shielding principle of the annular magnetic shield 09 of the present invention is as follows: when a large short-circuit current is cut off, the two adjacent fractures a and b respectively form an arc a and an arc b. a. B electric arc generates transverse magnetic field on the bypass respectively due to electromagnetic induction principle, and the normal components are BatAnd Bbt. Transverse magnetic field BatAnd BbtThe magnetic induction lines are acted by the annular magnetic shielding cover 09 in the process of transmitting to the mutual bypass fracture, BatAnd BbtAbsorbed magnetic polarization, most of magnetic induction lines are concentrated in annular thin-wall magnetic conduction materials (namely the first cover wall 091 and the second cover wall 092 of the annular magnetic shield cover 09) which are connected in a closed mode, and the annular magnetic shield cover 09, B is formedatAnd BbtThe magnetic field will be absorbed and shielded by the annular magnetic shield 09, and this shielding effect will be more pronounced as the thickness of the annular magnetic shield 09 increases. Thus BatAnd BbtAttenuation to B through annular magnetic shield 090The strength is significantly reduced with little effect on the bypass.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (6)
1. An annular magnetic shield characterized in that: including first cover wall and the second cover wall of relative arrangement, the both ends of first cover wall are connected with the both ends of second cover wall respectively and are formed ring structure, there is the clearance between first cover wall and the second cover wall, first cover wall and second cover wall bend along the S type jointly and form the holding tank more than two, the cell wall of holding tank comprises first cover wall or second cover wall, first cover wall and second cover wall all adopt magnetic material to make.
2. Annular magnetic shield according to claim 1, characterized in that: the first cover wall and the second cover wall are both in a cuboid shape, and the first cover wall and the second cover wall are bent to form more than two accommodating grooves along the S shape in the length direction of the first cover wall and the second cover wall.
3. Annular magnetic shield according to claim 2, characterized in that: the accommodating grooves are three or four.
4. A low-voltage direct current circuit breaker using the annular magnetic shield according to any of claims 1 to 3, comprising a base, the inner cavity of which is provided with more than two arc extinguishing chambers arranged side by side, characterized in that: the periphery of explosion chamber is equipped with cyclic annular magnetic shield cover, the quantity of explosion chamber and holding tank is the same, explosion chamber and holding tank one-to-one are arranged, every the explosion chamber is located the holding tank that corresponds respectively.
5. Low-voltage direct current circuit breaker according to claim 4, characterized in that: the annular magnetic shielding cover is poured in the base.
6. Low-voltage direct current circuit breaker according to claim 5, characterized in that: arc-extinguishing chamber and holding tank all establish to three or four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110134491.9A CN112908798A (en) | 2021-01-29 | 2021-01-29 | Annular magnetic shield and low-voltage direct-current circuit breaker using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110134491.9A CN112908798A (en) | 2021-01-29 | 2021-01-29 | Annular magnetic shield and low-voltage direct-current circuit breaker using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112908798A true CN112908798A (en) | 2021-06-04 |
Family
ID=76122446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110134491.9A Pending CN112908798A (en) | 2021-01-29 | 2021-01-29 | Annular magnetic shield and low-voltage direct-current circuit breaker using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112908798A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014068053A1 (en) * | 2012-10-31 | 2014-05-08 | Eaton Industries (Austria) Gmbh | Dc switchgear |
| CN203691859U (en) * | 2014-01-20 | 2014-07-02 | 中国船舶重工集团公司第七一六研究所 | Dual-layer shielding cover with electromagnetic shielding function |
| CN204348640U (en) * | 2014-11-28 | 2015-05-20 | 浙江正泰电器股份有限公司 | Residual current action breaker |
| WO2016078482A1 (en) * | 2014-11-20 | 2016-05-26 | 浙江正泰电器股份有限公司 | Multi-pole double-breakpoint plastic-shell circuit breaker |
| CN110047717A (en) * | 2019-06-06 | 2019-07-23 | 常熟开关制造有限公司(原常熟开关厂） | A kind of arc insulating cover of breaker |
| CN110248529A (en) * | 2019-06-28 | 2019-09-17 | 四川大学 | A kind of electro-magnetic shielding cover |
-
2021
- 2021-01-29 CN CN202110134491.9A patent/CN112908798A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014068053A1 (en) * | 2012-10-31 | 2014-05-08 | Eaton Industries (Austria) Gmbh | Dc switchgear |
| CN203691859U (en) * | 2014-01-20 | 2014-07-02 | 中国船舶重工集团公司第七一六研究所 | Dual-layer shielding cover with electromagnetic shielding function |
| WO2016078482A1 (en) * | 2014-11-20 | 2016-05-26 | 浙江正泰电器股份有限公司 | Multi-pole double-breakpoint plastic-shell circuit breaker |
| CN204348640U (en) * | 2014-11-28 | 2015-05-20 | 浙江正泰电器股份有限公司 | Residual current action breaker |
| CN110047717A (en) * | 2019-06-06 | 2019-07-23 | 常熟开关制造有限公司(原常熟开关厂） | A kind of arc insulating cover of breaker |
| CN110248529A (en) * | 2019-06-28 | 2019-09-17 | 四川大学 | A kind of electro-magnetic shielding cover |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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Application publication date: 20210604 |