CN101789338B - Self-energy air-blowing medium-voltage high-DC quick current-limiting circuit breaker - Google Patents
Self-energy air-blowing medium-voltage high-DC quick current-limiting circuit breaker Download PDFInfo
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- CN101789338B CN101789338B CN2010101340835A CN201010134083A CN101789338B CN 101789338 B CN101789338 B CN 101789338B CN 2010101340835 A CN2010101340835 A CN 2010101340835A CN 201010134083 A CN201010134083 A CN 201010134083A CN 101789338 B CN101789338 B CN 101789338B
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- circuit breaker
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- 238000007664 blowing Methods 0.000 title claims abstract description 42
- 238000001816 cooling Methods 0.000 claims description 37
- 238000009413 insulation Methods 0.000 claims description 20
- 230000004888 barrier function Effects 0.000 claims description 17
- 230000003068 static effect Effects 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 238000002679 ablation Methods 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 abstract description 26
- 230000007246 mechanism Effects 0.000 abstract description 7
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- 238000000034 method Methods 0.000 description 15
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- 238000005516 engineering process Methods 0.000 description 2
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- 230000003628 erosive effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
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- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
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Abstract
The invention discloses a self-energy air-blowing medium-voltage high-DC quick current-limiting circuit breaker. An insulating baffle is arranged to design a space round a contact system so as to achieve the purpose of utilizing self energy of an electric arc to exert the function of high-speed air flow arc blowing without an additional air blowing mechanism. The strong air blowing function can shorten the stagnation time of the electric arc, accelerate the electric arc to transfer from a contact to an arc way, lead the electric arc to quickly enter an arc extinguishing chamber, and shorten the on-off time, thereby realizing the purpose of quicker short-circuit current limiting.
Description
Technical field
The present invention relates to the current limiting technique on the straightening stream large current interruption device in a kind of being applied to, press high-DC quick current-limiting circuit breaker in particularly a kind of self-energy air-blowing.
Background technology
Getting in touch of DC power-supply system and people's daily life is more and more tightr, has all adopted DC power-supply system in many important industries such as China's city trolley bus, subway, smelting, chemical industry, stocking, ship electricity, mine at present.Wherein, dc circuit breaker is the assurance of DC power-supply system safe operation, has the defencive function of reliable cut-out DC loop fault electric current.Along with China's economy develops rapidly and the modernization progressively of industrial traffic department; Requirement to the electric power system reliability is also more and more stricter; Direct current power load capacity also continues to increase; Caused continuous increase thus, simultaneously its break performance has been proposed increasingly high requirement the dc circuit breaker demand.Simultaneously, along with the increase of electric pressure and rated current, cut-offfing of high-capacity direct current short circuit current becomes unusual difficult, and the requirement of its switch off time is also more and more harsher.Therefore have higher requirement for the quick current limiting capacity of dc circuit breaker.
In the middle of existing current limliting breaking technology, the method for air-flow arc blow-out has been a kind of generally acknowledged effective ways, in CN1564292A and CN1008415B etc., has all proposed the circuit breaker of blow arc-extinguishing mode.This method can reduce electric arc dead time, accelerates the electric arc speed of running, and improves medium recovery strength fast, thereby makes circuit breaker have higher breaking capacity.In the middle of existing circuit breaker design; The air-blowing method has following several kinds; A kind of is by piston mechanism acting formation Compressed Gas; The gases at high pressure that expand to form in conjunction with arc heat spray arc blow-out by spout when cut-offfing, treat to increase behind the current over-zero medium recovery strength behind the arc, and the method is widely used in enclosed sulphur hexafluoride ac hv breaker at present.But this method needs independent air-blowing mechanism, and needs high-seal, and bulky presses the grade Fast DC Circuit Breaker to use in being not suitable for.Second kind is to be applied to low-pressure field, after the circuit breaker starting the arc, force air-blowing to arcing region through piston mechanism, but mechanism kinematic speed is limited, is difficult to reach good air-blowing effect.Another kind is through attaching gas exhausted material in the electric arc arcing region, and gas exhausted material can gasification produce composition cooling electric arcs such as hydrogen behind arc erosion, increase arcing region pressure simultaneously, forms the air-blowing effect, and the method is widely used in low-voltage circuit breaker.Yet under the situation of the big electric current of middle pressure, after capacity of short circuit increases, if gas exhausted material is arranged at arcing region, when arcing, can gasify in a large number, the life-span significantly reduces, and presses the grade Fast DC Circuit Breaker to use in therefore also being not suitable for.
Summary of the invention
Deficiency or defective to above-mentioned prior art existence; The object of the present invention is to provide a kind of external air-blowing mechanism that need not; Can utilize the electric arc self-energy to produce the air-flow arc blowing function; Reduce electric arc dead time, accelerate electric arc from contact to the transfer process of running the arc road, increase fast in the self-energy air-blowing of medium recovery strength behind the arc and press high-DC quick current-limiting circuit breaker.
In order to achieve the above object; The technical scheme that the present invention adopts is: the arc control device that comprise contact system and be arranged on the contact system both sides; Said contact system comprises the galvanic circle that moving contact, fixed contact and the electric current inlet wire that is connected with fixed contact and electric current outlet constitute; It is characterized in that: join through the static contact and insulation baffle plate between two fixed contacts; Be provided with the air-blowing system housing that adapts with moving contact in the upper end of moving contact, the dynamic and static contact both sides in air-blowing system housing are respectively arranged with the contact insulation barrier, run arc zone and cooling duct, both sides in the middle of the contact insulation barrier is divided into air-blowing system housing; Run the arc zone in the middle of described and be connected, in the middle of the contact insulation barrier, offer to make and run the opening that the arc zone is connected with the cooling duct with arc control device.
Cooling duct of the present invention sidewall is that planar structure, sidewall are rough waveform or on sidewall, offer the cooling air chamber; The contact insulation barrier adopts the thin plate of arc ablation resistance material; The front region of moving contact is for running the arc zone, and the upper and lower surfaces that runs the arc zone is copper or silver-plated copper conductor metal surface; Running the arc zone becomes " returning " font to be communicated with layout with the cooling duct at the gas medium around the contact; The cooling duct inner surface is plane or roughness.
The present invention is close to moving contact and is provided with insulation barrier, makes the moving contact surrounding space form the circulation of air flow passage, after electric arc produces; Especially during large current interruption, electric arc receives magnetic field and thermal field and acts on arcing region and produce strong convection current, and electric arc is produced strong air-blowing effect; Electric arc is transferred to from contact fast run the arc road, quicken to get into arc control device, arc voltage raises fast; Cold air adds between the dynamic/static contact simultaneously, increases medium recovery strength fast.
Description of drawings
Fig. 1 is an overall structure sketch map of the present invention;
Fig. 2 is contact system of the present invention and runs arc road sketch map;
Fig. 3 is an air-blowing system schematic of the present invention;
Fig. 4 is contact system of the present invention and air-blowing system profile;
Fig. 5 is that contact of the present invention is opened starting the arc stage sketch map;
Fig. 6 is that electric arc of the present invention is transferred to race arc road sketch map by contact.
Fig. 7 is that electric arc of the present invention is about to get into the arc control device sketch map.
Fig. 8 is a flow field sketch map after the cross section starting the arc of air-blowing of the present invention system;
Fig. 9, Figure 10 and Figure 11 are respectively the three kinds of structure level schematic cross-sections in cooling duct;
Embodiment
Preferred embodiment below in conjunction with accompanying drawing and double break mouth is done further explain to structure of the present invention and operation principle.
Referring to Fig. 1-4; The preferred embodiment of the present invention is a bridge contact double break mouth circuit breaker; The arc control device 3 that comprise contact system 2 and be arranged on contact system 2 both sides; Said contact system 2 comprises the galvanic circle that moving contact 7, fixed contact 8 and the electric current inlet wire 11 that is connected with fixed contact 8 and electric current outlet 12 constitutes, and joins through static contact and insulation baffle plate 14 between two fixed contacts 8, is provided with the air-blowing system housing 1 that adapts with moving contact 7 in the upper end of moving contact 7; Dynamic and static contact 7,8 both sides in air-blowing system housing 1 are respectively arranged with contact insulation barrier 5; Run arc zone 4 and cooling duct, both sides 6 in the middle of contact insulation barrier 5 is divided into air-blowing system housing 1, run arc zone 4 in the middle of described and be connected, in the middle of contact insulation barrier 5, offer to make and run the openings 13 that arc regional 4 is connected with cooling duct 6 with arc control device 3.
Air-blowing of the present invention system is by running arc zone 4, and insulation barrier 5 is formed with cooling duct 6.Wherein insulation barrier 5 is thin plates of being processed by the arc ablation resistance material, is distributed in the both sides of each moving contact, is close to the side of moving contact 7, and does not hinder the divide-shut brake process of moving contact.Front region at moving contact 7 is race arc zone 4, and the upper and lower surfaces that runs arc zone 4 is metal surface (being generally copper or silver-plated copper conductor), the race arc road 10,9 of just dynamic and static contact correspondence.The side of running arc zone 4 then is the wall of insulation barrier 5.Arc control device 3 are led in the outlet of running arc zone 4.Cooling duct 6 is boundary with running arc zone 4 with insulation barrier 5, and it is insulator wall on four sides.In the middle of insulation barrier 5, an opening 13 is set, race arc zone is connected in inside with the cooling duct, around each moving contact, form " returning " font gas connected region.
Introduce specific operation process, air-blowing principle and the advantage of the circuit breaker that the present invention relates to below in detail according to the separating brake process.
Referring to Fig. 4, when being in "on" position for the present invention, electric current passes through inlet wire 11, moving contact 7, and fixed contact 8 and outlet 12 form normal through-flow loop.Referring to Fig. 5, during for failed because, moving contact of breaker 7 moves upward under operating mechanism drives in release action back, and beginning separating brake process produces electric arc 15 this moment between dynamic/static contact.Under the situation that is provided with of Fig. 5, two electric arcs can form pressure differential, and the airflow field that the cryogenic gas around progressively driving produces in a big way be mobile respectively towards the strong air current flow of arc control device 3 directions generation of correspondence under the effect of loop and self-generated magnetic field.
Referring to Fig. 6, when being opened to certain position for contact of the present invention, electric arc is transferred to the process of running arc road 10 by moving contact 7.This moment is because short circuit current is very big; Heat effect and electromagnetic force to electric arc are very strong; Make that running arc zone 4 forms strong convection current with " returning " font gas zones that cooling duct 6 forms; High-temperature gas is to arc control device direction high velocity jet, and cryogenic gas is back between the dynamic/static contact through opening 13 by cooling duct 6 simultaneously.Fig. 8 is the flow field velocity schematic vector diagram of horizontal cross-section in the air-blowing system, and arrow is depicted as flow field velocity and distributes.Promptly formed strong self extinguishing type air-flow arc blowing function this moment; Make electric arc to be transferred to by contact fast and run the arc road; And because cryogenic gas is complemented between the dynamic/static contact; Make the medium recovery strength between the dynamic/static contact be able to quick raising, avoided the behind punch-through in the arc transfer process.
Referring to Fig. 7, for after contact of the present invention opens, electric arc is transferred to fully and runs the arc road, is about to get into the state of arc control device.This moment is along with the increase of short circuit current; Airflow field in the connected region of race arc zone 4 and cooling duct 6 formation is stronger; Air-blowing effect to electric arc is also stronger; Promote electric arc 15 and quicken to the arc control device motion, and between dynamic/static contact, be full of by the non-ionized cryogenic gas that was in originally in the cooling duct 6 fully, medium recovery strength is high.
Fig. 9, Figure 10 and Figure 11 are respectively three kinds of derivative strucure horizontal cross-section sketch mapes of cooling duct among the present invention.In the present invention, the effect of cooling duct is that as the part of air-blowing system airflow passage, formation circulation of air flow path makes a part of electric arc self-energy can change into the air-blowing energy on the one hand.Behind high velocity air circulation formation and electric arc entering arc control device, have the sub-fraction hot gas and get into the cooling duct from arc control device on the other hand, the cooling duct will produce cooling effect to it, and amplified medium recovers intensity.The cooling duct sidewall of Fig. 9 is the plane, can make air communication smooth, but sidewall surfaces is long-pending little, and cooling capacity is relatively poor relatively.The part of wherein nonisulated baffle plate 5; Its material can be gas exhausted material, runs into the gas that can produce the liberation that disappears when hot gas flows into such as hydrogen etc., owing to be not that electric arc is directly ablated; Hot gas temperature is far below arc center's regional temperature; It is not serious relatively to ablate, and can guarantee the life-span, can reach better cooling effect simultaneously.The cooling duct sidewall of accompanying drawing 11 is rough waveform, and it is long-pending to have increased contact surface, and cooling effect is better.The cooling duct of accompanying drawing 11 is for to be provided with a cooling air chamber 16 at the insulative sidewall away from moving contact, and the cryogenic gas in the air chamber mixes with the hot gas that gets into the cooling duct, thereby realizes the effect of further cooling hot gas.The use that can mutually combine of the above three kinds of method.
Claims (7)
1. press high-DC quick current-limiting circuit breaker in a self-energy air-blowing; The arc control device (3) that comprise contact system (2) and be arranged on contact system (2) both sides; Said contact system (2) comprises the galvanic circle that moving contact (7), fixed contact (8) and the electric current inlet wire (11) that is connected with fixed contact (8) and electric current outlet (12) constitute; It is characterized in that: join through static contact and insulation baffle plate (14) between two fixed contacts (8); Be provided with the air-blowing system housing (1) that adapts with moving contact (7) in the upper end of moving contact (7); Dynamic and static contact in air-blowing system housing (1) (7,8) both sides are respectively arranged with contact insulation barrier (5); Contact insulation barrier (5) runs arc zone (4) and cooling duct, both sides (6) in the middle of air-blowing system housing (1) is divided into, and the described middle arc zone (4) of running is connected with arc control device (3), in the middle of contact insulation barrier (5), offers to make and runs the opening (13) that arc regional (4) is connected with cooling duct (6).
2. press high-DC quick current-limiting circuit breaker in the self-energy air-blowing according to claim 1, it is characterized in that: described cooling duct (6) sidewall is planar structure, rough waveform or on sidewall, offers cooling air chamber (16).
3. press high-DC quick current-limiting circuit breaker in the self-energy air-blowing according to claim 1, it is characterized in that: described contact insulation barrier (5) adopts the thin plate of arc ablation resistance material.
4. press high-DC quick current-limiting circuit breaker in the self-energy air-blowing according to claim 1, it is characterized in that: the front region of described moving contact (7) is for running arc zone (4), and the upper and lower surfaces that runs arc zone (4) is the metal surface.
5. press high-DC quick current-limiting circuit breaker in the self-energy air-blowing according to claim 4, it is characterized in that: described metal surface is copper or silver-plated copper conductor surface.
6. press high-DC quick current-limiting circuit breaker in the self-energy air-blowing according to claim 1, it is characterized in that: described race arc zone (4) becomes " returning " font to be communicated with layout with cooling duct (6) at the gas medium around the contact.
7. press high-DC quick current-limiting circuit breaker in the self-energy air-blowing according to claim 1, it is characterized in that: described cooling duct (6) inner surface is plane or roughness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101340835A CN101789338B (en) | 2010-03-29 | 2010-03-29 | Self-energy air-blowing medium-voltage high-DC quick current-limiting circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101340835A CN101789338B (en) | 2010-03-29 | 2010-03-29 | Self-energy air-blowing medium-voltage high-DC quick current-limiting circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101789338A CN101789338A (en) | 2010-07-28 |
| CN101789338B true CN101789338B (en) | 2012-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101340835A Expired - Fee Related CN101789338B (en) | 2010-03-29 | 2010-03-29 | Self-energy air-blowing medium-voltage high-DC quick current-limiting circuit breaker |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104143456B (en) * | 2013-11-13 | 2016-11-02 | 国家电网公司 | A kind of major loop of dc circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1008415B (en) * | 1985-09-30 | 1990-06-13 | Bbc勃朗勃威力有限公司 | Gas-blast switch |
| FR2845514B1 (en) * | 2002-10-03 | 2004-11-12 | Alstom | ROTATING ARC GAS CIRCUIT BREAKER |
| JP4421331B2 (en) * | 2004-02-26 | 2010-02-24 | 株式会社東芝 | Gas circuit breaker |
| CN1234145C (en) * | 2004-04-19 | 2005-12-28 | 西安交通大学 | Low voltage current-limiting breaker based on forced air explusion |
| CN101238534A (en) * | 2005-08-10 | 2008-08-06 | Abb研究有限公司 | Self-blast circuit breaker with control body |
| JP2010056021A (en) * | 2008-08-29 | 2010-03-11 | Toshiba Corp | Gas-blast circuit breaker |
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2010
- 2010-03-29 CN CN2010101340835A patent/CN101789338B/en not_active Expired - Fee Related
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| CN101789338A (en) | 2010-07-28 |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU ZHEN'AN POWER EQUIPMENTS CO., LTD. Effective date: 20111223 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yang Fei Inventor after: Rong Mingzhe Inventor after: Wu Yi Inventor after: Wu Zhenfei Inventor after: Yang Hang Inventor after: Wang Weizong Inventor after: Wang Xiaohua Inventor after: Liu Yiying Inventor before: Yang Fei Inventor before: Rong Mingzhe Inventor before: Wu Yi Inventor before: Wang Weizong Inventor before: Wang Xiaohua Inventor before: Liu Yiying |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: YANG FEI RONG MINGZHE WU YI WANG WEIZONG WANG XIAOHUA LIU YIYING TO: YANG FEI RONG MINGZHE WU YI WU ZHENFEI YANG HANG WANG WEIZONG WANG XIAOHUA LIU YIYING |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20111223 Address after: 710049 Xianning Road, Shaanxi, China, No. 28, No. Applicant after: Xi'an Jiaotong University Co-applicant after: Jiangsu Zhen'an Power Equipments Co., Ltd. Address before: 710049 Xianning Road, Shaanxi, China, No. 28, No. Applicant before: Xi'an Jiaotong University |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120523 Termination date: 20180329 |