CN105244238A - Low-voltage breaker suitable for tunnel jet blower fan - Google Patents
Low-voltage breaker suitable for tunnel jet blower fan Download PDFInfo
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- CN105244238A CN105244238A CN201510715696.0A CN201510715696A CN105244238A CN 105244238 A CN105244238 A CN 105244238A CN 201510715696 A CN201510715696 A CN 201510715696A CN 105244238 A CN105244238 A CN 105244238A
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- circuit breaker
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- jet blower
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- 230000009191 jumping Effects 0.000 claims description 17
- 238000012544 monitoring process Methods 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 230000001960 triggered effect Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 description 18
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention discloses a low-voltage breaker suitable for tunnel jet blower fan. The low-voltage breaker suitable for tunnel jet blower fan comprises a main contact connected with a control circuit with the tunnel jet blower fan in a circuit; a hop hook in mechanical connection with the main contact for controlling breaking or conduction of the main contact; a lock catch which is buckled to or disengaged from the hop hook, wherein when the lock catch is buckled to the hop hook, the main contact is conducted, and when the lock catch is disengaged from the hop hook, the hop hook drives the main contact to be broken; and a tripping module which controls the lock catch to be buckled to or disengaged from the hop hoop through applying an acting force on the lock catch and comprises an overcurrent release and an overload protection release. According to the invention, release currents of the employed overcurrent release is 3.5 times the rated currents of a breaker, and action currents can help to realize protection of single-phase grounding fault currents of a long-distance power supply line and can also be prevented from full-voltage staring currents of the jet blower fan; the overload protection release only acts on an alarm signal loop and is not used for trip-out so that an overload alarm function is realized.
Description
Technical field
The present invention relates to the higher level electric substation transmission line circuit proterctive equipment of a kind of tunnel fire control smoke exhausting exhaust blower, be specifically related to a kind of low-voltage circuit breaker being applicable to tunnel jet blower.
Background technology
As shown in Figure 1, in tunnel, jet blower 101 is as the important fire-fighting equipment of tunnel internal, and general paired layout, is mainly used in discharging fume when there is fire in tunnel, to ensure that staff in tunnel can evacuation egress in time, personal safety and property loss are dropped to minimum.
According to China standard GB50054-2011 " low-voltage distribution design specification " 6.3.6 article and GB50055-2011 " Code for design of power distribution of general electrical installations " 2.3.7 article regulation; " when the loss that overload power-off ratio overload causes is larger; its overload protection does not answer line disconnection, can act on signal ".Therefore the route protection circuit breaker of important fire fighting burthen often adopts does not have overload protection and the single magnetic release only having short-circuit protection, as the Tmax breaker of plastic casing of ABB or the NSX breaker of plastic casing of Schneider.Selected by this series products, the magnetic drop-away current of single magnetic release is generally 6 ~ 15 times of breaker rated current, and No-mistake Principle protection warning function.In addition, electronic trip unit cannot to be closed and cost is very high due to its overload protection function, therefore also inapplicable.
In tunnel compared with the fire-fighting equipment such as jet blower and fire pump, most marked difference is that quantity is many, linear distribution, distant apart from electric substation.Provision according to China industry standard JTGD70/2-2014 " vcehicular tunnel design specification second traffic engineering and affiliated facility " 11.2.4 article illustrates---" through the technology and economy comparison that arranges a large amount of tunnel electric substation; 1.0km and following tunnel is single-ended establishes an electric substation; the two ends, tunnel of 1.0 ~ 1.5km arrange a transformer and distribution station and an outdoor cabinet type transformer station respectively, and a transformer and distribution station is respectively established at the two ends, tunnel of 1.5 ~ 3km ".Therefore, the low-voltage power supply distance of the jet blower distance electric substation of tunnel mid portion likely reaches 1 ~ 1.5km.At this time because power supply distance is longer, single-phase short circuit (the comprising single phase ground fault) electric current that line end occurs is usually very little, can at this moment conventional circuit breaker realize defencive function? we are calculated by following instance and are verified:
As shown in Figure 2; for a kind of example of the tunnel jet blower control cabinet primary system figure for verifying; circuit system connects the conventional power supply and stand-by power supply that draw from electric substation; be connected to two-way jet blower control circuit under power supply, every road control circuit from power supply successively circuit be connected with: Dual-power automatic switching 202, Surge Protector 203, common single magnetic circuit breaker 204, contactor 206, motor protector 207 and jet blower 208.Every road jet blower control circuit also includes fire-fighting power supply monitoring module 201,205, fire-fighting power supply monitoring module 201 circuit is connected between power supply and Dual-power automatic switching 202, separately have anti-Power Monitoring Unit 205 circuit to be connected between common single magnetic circuit breaker 204 and contactor 206, this fire-fighting power supply monitoring module 201,205 is connected with external fire-fighting power supply supervisory control system main-machine communication respectively.
Electric substation's transformer that this tunnel jet blower control cabinet primary system connects adopts the 10/0.4kV dry-type transformer of 1000kVA; Jet blower 208 single-machine capacity is 18.5kW/ platform, and terminal control case one controls two, and service entrance switch selects single magnetic circuit breaker 204 of rated current In=80A.Electric substation is to jet blower 207 low-voltage power supply cable length 800m, and cable specification is ZANH-YJV-1(3x120+2x70), and adopt TN-S grounding system.Concrete computational process is as follows:
（1）
In formula (1),
for single-phase earth fault current, Rphp is the phase line-protective wire resistance of circuit, and Xphp is the phase line-protective wire reactance of circuit.Known according to " industry and the Domestic distribution design manual third edition ", 800 meters of specifications are the Rphp=0.8x0.596=0.48 of 3x120+2x70 cable
, Xphp=0.8x0.161=0.13
.
Can be obtained by above-mentioned parameter calculating formula (1): single-phase earth fault current
=445.44A.
Note: calculate the impedance of guarantor mutually only considering cable line herein, as consideration system and transformer protect impedance mutually, single-phase short circuit current result of calculation can be less.
According to China standard GB50054-2011 " low-voltage distribution design specification " 6.2.4 article regulation; " when short-circuit protective device is circuit breaker, the breaking current of protected circuit end should not be less than 1.3 times of the instantaneous or short time delay overcurrent release setting current of circuit breaker ".Therefore, realize is the single phase earthing protection of 3x120+2x70 cable end piece 445.44A for 800 meters of specifications, and the instantaneous release setting current of circuit breaker mostly is 342.65A most.And the drop-away current of existing circuit breaker list magnetic release minimum be 6 times of breaker rated current In, therefore single magnetic circuit breaker minimum working current of this engineering In=80A is 480A, cannot realize one-phase ground protection function.
Equally, other guard methods of prior art can not meet protection requirement equally, such as:
1) adopt and protect the lower 3x240+2x120 cable of impedance mutually, single magnetic circuit breaker of In=80A can realize defencive function as calculated, but this way will make project investment greatly to increase, extremely uneconomical.
2) single magnetic circuit breaker that rated current In is lower is adopted; such as adopt the mono-magnetic circuit breaker of In=50A; now can realize defencive function, but be less than the calculating current that loop normally works due to circuit breaker setting current, therefore more cannot realize the overload warning function in loop.
3) electronic trip unit of band short time delay function is adopted; short time delay operating current can be utilized within the relatively short time to excise fault current; but the overload protection of electronic trip unit cannot be turned off; and cost is much more expensive than single magnetic release, be not therefore suitable for the tunnel firefighting fan of long distance power supply yet.
4) adopt the earth leakage protective circuit breaker of band, the detection of three phase unbalance current can be adopted to realize phase-to-ground fault detection.But the determination that this residual current circuit breaker has overload protection not turn off equally, and residual operating current generally only has a few peace to tens peaces, easy misoperation, what be not therefore suitable for fire fighting burthen joins point protection.
Therefore, now commercially there is no a kind of breaker of plastic casing that perfect can be applied to the protection of tunnel jet blower outlet cable.Using existing circuit breaker once break down or misoperation, even causing casualties causing huge economic asset loss due to normally fire control smoke exhausting cannot be carried out.
Summary of the invention
The invention provides a kind of low-voltage circuit breaker being applicable to tunnel jet blower, can realize one-phase ground protection function, a motor protection machine trigger alarm does not trip, and reduces production cost.
For achieving the above object, the invention discloses a kind of low-voltage circuit breaker being applicable to tunnel jet blower, be characterized in, this low-voltage circuit breaker comprises:
Main contact, its circuit is connected in the control circuit of tunnel jet blower;
Jump hook, itself and main contact are mechanically connected, and control main contact and disconnect or conducting;
Snap close, it is arranged at jumps by hook, interlocks with jumping hook or breaks off relations; Jump hook when interlocking and keep static, main contact conducting; Jump hook during unhook to be subjected to displacement, drive main contact to disconnect;
Dropout module, it is arranged near snap close, by applying active force to snap close, controlling snap close and interlocks with jumping hook or break off relations;
Above-mentioned dropout module comprises overcurrent trip and overload protection release; the drop-away current of this overcurrent trip is N times of low-voltage circuit breaker rated current; N gets and is greater than 3 and is less than or equal to 4, and the overload-alarm current calibration multiple of overload protection release is less than or equal to the rated current of low-voltage circuit breaker.
The drop-away current of above-mentioned overcurrent trip is set to 3.5 times of low-voltage circuit breaker rated current.
The drop-away current of above-mentioned overcurrent trip is set to non-adjustable.
The overload-alarm current calibration multiple of above-mentioned overload protection release is 0.8 to 1 times of the rated current of low-voltage circuit breaker.
The overload-alarm current calibration multiple of above-mentioned overload protection release is set to adjustable.
Above-mentioned overload protection release does not apply active force to snap close;
Above-mentioned low-voltage circuit breaker also includes warning circuit, and overload protection release is only connected with the triggered switch circuit of this warning circuit, controls the start and stop of warning circuit.
Above-mentioned low-voltage circuit breaker also circuit is connected with leakage fire monitoring module and/or fire-fighting power supply monitoring module.
Dropout module monitors the control circuit of tunnel jet blower in real time, and when generation is abnormal, dropout module applies active force to snap close and is subjected to displacement, and makes snap close and jump between hook to thread off, and jumps hook and namely drives main contact to disconnect, realize the control circuit open circuit of tunnel jet blower.
The low-voltage circuit breaker of the present invention a kind of low-voltage circuit breaker and prior art that are applicable to tunnel jet blower is compared, its advantage is, the present invention adopts the drop-away current of overcurrent magnetic release to be 3.5 times of breaker rated current, make operating current can realize for the long protection apart from supply line's single-phase earth fault current, the direct-on-line starting electric current of jet blower can be avoided again, this product is according to operating characteristic, adopt nonadjustable overcurrent trip, do not need to arrange shunted exciter tripping and no-voltage trip, contribute to reducing production cost;
Overload protection release of the present invention only acts on alarm signal loop, is not used in the tripping operation of low-voltage circuit breaker, realizes the overload warning function of low-voltage circuit breaker to the control circuit of tunnel jet blower.
Accompanying drawing explanation
Fig. 1 is the layout plan of jet blower in tunnel;
Fig. 2 is tunnel jet blower control cabinet primary system figure;
Fig. 3 is the primary system figure that the present invention is applicable to the low-voltage circuit breaker of tunnel jet blower;
Fig. 4 is the structural representation that the present invention is applicable to the low-voltage circuit breaker of tunnel jet blower.
Embodiment
Below in conjunction with accompanying drawing, further illustrate specific embodiments of the invention.
As Fig. 3 and shown in composition graphs 2; for a kind of primary system figure being applicable to the low-voltage circuit breaker embodiment of tunnel jet blower; this low-voltage circuit breaker 301 circuit is connected in the power distribution protection circuit of jet blower; to be applied on the low-pressure line-outgoing of tunnel electric substation higher level's switch of common single magnetic circuit breaker 204 (namely in Fig. 2); low-voltage circuit breaker 301 connects power supply; under connect jet blower control cabinet 302, be ZANH-YJV-1(3x120+2x70 with jet blower control cabinet 302 by specification) cable 303 circuit be connected.
As shown in Figure 4, be a kind of structural representation being applicable to the low-voltage circuit breaker embodiment of tunnel jet blower, its Low Voltage Circuit Breaker comprises: main contact 401, jumping hook 402, snap close and dropout module.
Main contact 401 circuit is connected in the control circuit of tunnel jet blower, control retainer belt logical guarantee tunnel jet blower control circuit when tunnel jet blower normally runs normally to run, when tunnel jet blower operation irregularity, cut off tunnel jet blower control circuit, stop tunnel jet blower work.
Jump hook 402 to be mechanically connected with main contact 401, the first hook formation is provided with in the one end of jumping hook 402, the other end contrary with the first hook formation is then connected with the first spring mechanism 409, first spring mechanism 409 makes jumping hook 402 by the active force towards the first spring mechanism 409 with its convergent force, thus jumping hook 402 pairs of main contacts 401 are applied towards the active force of the first spring mechanism 409.Jumping hook 402 can occur towards the displacement of the first spring mechanism 409 by the effect of the first spring mechanism 409 convergent force in a free state, drives main contact 401 to produce towards the displacement of the first spring mechanism 409, thus makes main contact 401 open circuit.
Snap close is arranged at jumps hook 402 side, and be positioned at and jump the side that hook 402 is provided with the first hook formation, snap close comprises snap close body 403 and is arranged at the drive mechanism 411 of snap close body 403 side.
Snap close body 403 is being provided with second hook formation corresponding with first hook formation of jumping hook 402 towards the one end of jumping hook 402, under tunnel jet blower is in normal operating conditions, snap close body 403 is by the second hook formation and the mutual padlock of the first hook formation of jumping hook 402, stop and jump the effect bottom offset of hook 402 at the first spring mechanism 409, avoiding jumping hook 402 drives main contact 401 to be subjected to displacement and open circuit, makes main contact 401 keep conducting.At the other end contrary with the second hook formation, snap close body 403 is movably connected in a rotating shaft, snap close body 403 is with this rotating shaft for pivot can rotate, and snap close body 403 is by rotating padlock or unhook mutually between control second hook formation and the first hook formation.The second spring structure 410 is connected with at the side of snap close body 403, second spring structure 410 applies active force by its convergent force to snap close body 403, snap close body 403 is rotated towards near the direction of jumping hook 402, thus drive the second hook formation to move near the first hook formation, the second hook formation and the first hook formation are contacted with each other and padlock.
In the present embodiment, drive mechanism 411 is set to T-type structure, is close to dropout module installation, can receive the active force that dropout module applies.When tunnel jet blower occurs abnormal, dropout module applies the active force in contrast to the second spring structure 410 convergent force by magnetic field or physical contact to drive mechanism 411, snap close body 403 is driven to resist the convergent force of the second spring structure 410 by drive mechanism 411, the direction being away from jumping hook 402 produces certain displacement, thus make the second hook formation and the first hook formation mutually away from and break off relations, jump hook 402 to be subjected to displacement under the effect of the first spring mechanism 409 convergent force, drive main contact 401 open circuit.
Dropout module is arranged near the drive mechanism 411 of above-mentioned snap close.Module of threading off in the present embodiment includes: overcurrent trip 404, overload protection release 405.Overcurrent trip 404, overload protection release 405 are arranged around the drive mechanism 411 of snap close, and circuit is connected in the control circuit of tunnel jet blower respectively, monitors in real time control circuit.
In the present embodiment, overcurrent trip 404 adopts overcurrent magnetic release, is close to drive mechanism 411 and arranges.If the drop-away current due to overcurrent trip 404 adopts 1 ~ 3 times of direct-on-line starting electric current that operating current likely can be made cannot to avoid jet blower of low-voltage circuit breaker rated current, so the drop-away current of overcurrent trip 404 is set to the N of low-voltage circuit breaker rated current In doubly here, N gets and is greater than 3 and is less than or equal to 4, and be set to non-adjustable, to reduce production cost.In the present embodiment, the drop-away current of overcurrent trip 404 is set to 3.5 times of low-voltage circuit breaker rated current In.When overcurrent trip 404 monitors the control circuit overcurrent of tunnel jet blower, then triggered current release 404 carries out displacement by magnetic field suction drive mechanism 411, drive mechanism 411 drives snap close body 403 to overcome the convergent force of the second spring structure 410, rotate away from jumping hook 402, second hook formation and the first hook formation break off relations, jumping hook 402 is subjected to displacement by the active force of the first spring mechanism 409, drives main contact 401 open circuit.
The mode of operation of overload protection release 405 is different from above-mentioned release; in the present embodiment, overload protection release 405 adopts and only acts on warning, is not used in the overload protection thermal overload release of tripping operation; low-voltage circuit breaker is also provided with warning circuit for this reason; be not provided with magnetic fields between overload protection release 405 and drive mechanism 411, overload protection release 405 only and between the trigger switch of warning circuit circuit be connected or be mechanically connected or pass through magnetic field interaction.
The multiple of adjusting of the alert electric current of overload guarantor of overload protection release 405 is set to 0.8 times of low-voltage circuit breaker rated current In to 1 times, and is set to adjustable.When overload protection release 405 detects the control circuit overload of tunnel jet blower; then by sending the signal of telecommunication or applying active force by mechanical movement or apply active force by magnetic field; the trigger switch of trigger alarm circuit; thus warning circuit is started, carry out sound and light alarm or upload alarm signal to far-end.
Preferably, low-voltage circuit breaker also circuit is connected with leakage fire monitoring module and/or fire-fighting power supply monitoring module, carries out leakage fire monitoring and fire-fighting power supply monitoring respectively to tunnel jet blower.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (7)
1. be applicable to a low-voltage circuit breaker for tunnel jet blower, it is characterized in that, this low-voltage circuit breaker comprises:
Main contact, its circuit is connected in the control circuit of tunnel jet blower;
Jump hook, itself and main contact are mechanically connected, and control main contact and disconnect or conducting;
Snap close, it is arranged at jumps by hook, interlocks with jumping hook or breaks off relations; Jump hook when interlocking and keep static, main contact conducting; Jump hook during unhook to be subjected to displacement, drive main contact to disconnect;
Dropout module, it is arranged near snap close, by applying active force to snap close, controlling snap close and interlocks with jumping hook or break off relations;
Described dropout module comprises overcurrent trip and overload protection release; the drop-away current of this overcurrent trip is N times of low-voltage circuit breaker rated current; N gets and is greater than 3 and is less than or equal to 4, and the overload-alarm current calibration multiple of overload protection release is less than or equal to the rated current of low-voltage circuit breaker.
2. low-voltage circuit breaker as claimed in claim 1, it is characterized in that, the drop-away current of described overcurrent trip is set to 3.5 times of low-voltage circuit breaker rated current.
3. low-voltage circuit breaker as claimed in claim 1 or 2, it is characterized in that, the drop-away current of described overcurrent trip is set to non-adjustable.
4. low-voltage circuit breaker as claimed in claim 1, it is characterized in that, the overload-alarm current calibration multiple of described overload protection release is 0.8 to 1 times of the rated current of low-voltage circuit breaker.
5. the low-voltage circuit breaker as described in claim 1 or 4, is characterized in that, the overload-alarm current calibration multiple of described overload protection release is set to adjustable.
6. the low-voltage circuit breaker as described in claim 1 or 4, is characterized in that, described overload protection release does not apply active force to snap close;
Described low-voltage circuit breaker also includes warning circuit, and overload protection release is only connected with the triggered switch circuit of this warning circuit, controls the start and stop of warning circuit.
7. low-voltage circuit breaker as claimed in claim 1, it is characterized in that, described low-voltage circuit breaker also circuit is connected with leakage fire monitoring module and/or fire-fighting power supply monitoring module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510715696.0A CN105244238A (en) | 2015-10-29 | 2015-10-29 | Low-voltage breaker suitable for tunnel jet blower fan |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510715696.0A CN105244238A (en) | 2015-10-29 | 2015-10-29 | Low-voltage breaker suitable for tunnel jet blower fan |
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| CN201510715696.0A Pending CN105244238A (en) | 2015-10-29 | 2015-10-29 | Low-voltage breaker suitable for tunnel jet blower fan |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923993A (en) * | 2010-07-09 | 2010-12-22 | 东北电力大学 | A kind of air switch that can be regularly |
| CN202084489U (en) * | 2011-03-10 | 2011-12-21 | 北京正北元电器有限公司 | Thermomagnetic plastic-case breaker with overload alarm non-tripping function |
| CN103489723A (en) * | 2013-08-29 | 2014-01-01 | 董刚 | Air switch capable of being connected with sensor |
| CN204348664U (en) * | 2015-01-25 | 2015-05-20 | 江苏恒泽安装工程股份有限公司 | A kind of air switch |
| CN205376437U (en) * | 2015-10-29 | 2016-07-06 | 上海市政工程设计研究总院（集团）有限公司 | Low -voltage circuit breaker suitable for tunnel efflux fan |
-
2015
- 2015-10-29 CN CN201510715696.0A patent/CN105244238A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923993A (en) * | 2010-07-09 | 2010-12-22 | 东北电力大学 | A kind of air switch that can be regularly |
| CN202084489U (en) * | 2011-03-10 | 2011-12-21 | 北京正北元电器有限公司 | Thermomagnetic plastic-case breaker with overload alarm non-tripping function |
| CN103489723A (en) * | 2013-08-29 | 2014-01-01 | 董刚 | Air switch capable of being connected with sensor |
| CN204348664U (en) * | 2015-01-25 | 2015-05-20 | 江苏恒泽安装工程股份有限公司 | A kind of air switch |
| CN205376437U (en) * | 2015-10-29 | 2016-07-06 | 上海市政工程设计研究总院（集团）有限公司 | Low -voltage circuit breaker suitable for tunnel efflux fan |
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Application publication date: 20160113 |