CN101345157A - Vacuum circuit breaker on 24kV outdoor column - Google Patents
Vacuum circuit breaker on 24kV outdoor column Download PDFInfo
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- CN101345157A CN101345157A CNA2008100240692A CN200810024069A CN101345157A CN 101345157 A CN101345157 A CN 101345157A CN A2008100240692 A CNA2008100240692 A CN A2008100240692A CN 200810024069 A CN200810024069 A CN 200810024069A CN 101345157 A CN101345157 A CN 101345157A
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Abstract
The invention provides a 24kV vacuum circuit breaker on an outdoor column; the whole structure of the vacuum circuit breaker adopts an open structure with separated three phases and eliminates the threatening of 'internal condensation'; the insulated structure adopts the composite insulation of epoxy resin and silicon rubber; furthermore, the insulation structure of the vacuum arc distinguish chamber is improved, and the insulation performance of the circuit breaker is improved; a miniaturized spring operation mechanism increase the switch-closing force of the spring operation mechanism simultaneously so as to sufficiently meet the switch-closing speed requirement of the 24kV outdoor circuit breaker; a special vacuum arc distinguish chamber is adopted so as to lead the rated current of the circuit breaker, the short circuit on/off current and the on/off time of the short circuit on/off current to be improved; the vacuum circuit breaker of the invention aims at the 24kV high-voltage power transporting circuit, fills up the blank of the similar equipment in China, and has the advantages of high reliability, miniaturization, intellectualization, maintenance-free, and strong on/off capability of short circuit current.
Description
Technical field
The invention belongs to the electrical protection apparatus field, be specially the outdoor pole vacuum circuit breaker of a kind of 24kV.
Background technology
Along with the high speed development of social economy and science and technology, urban and rural power grids have proposed more and more higher requirement to the supply of electrical energy of high-quality, high reliability, and China is just throwing huge fund at present urban and rural power grids is carried out construction and upgrading.And along with the power load of China big and medium-sized cities sharply increases, and the problem that the rural power grids circuit is long, equipment is old, line loss is high becomes increasingly conspicuous, original 10kV power supply has been difficult to satisfy power reguirements, expose weakness such as its power supply distance is excessive, line loss rate is high, quality of voltage is difficult to meet the requirements gradually, and the power supply of employing 20kV electric pressure has a series of advantages such as construction cost that increase power supply capacity, assurance quality of voltage, the electric energy loss of reduction electrical network, saving electrical network, so adopt 20kV voltage distribution grade to be the inexorable trend of development, imperative.China builds over against the 20kV electrical network at present, wherein some areas, Jiangsu Province has been carried out the all-round construction of 20kV distribution line.Circuit breaker is the important component part of 20kV power distribution network as a kind of high voltage switchgear, and its effect is very important.Yet the domestic outdoor breaker apparatus shortage that is used for the 20kV electric pressure at present, external electric equipment and its technical conditions of power distribution equipment, insulation coordination, testing standard etc. also do not adapt to the relevant criterion of China's actual conditions.For satisfying the needs that domestic 20kV distribution is built, development produces that the reasonable price, the quality that are fit to China's national situation are really up to the mark, the 24kV outdoor high-voltage alternating current vacuum circuit-breaker of advanced technology, beyond doubt the problem that press for solution of pendulum in face of the high-voltage switch gear manufacturing.
Summary of the invention
The problem to be solved in the present invention is: for satisfying the needs that domestic 20kV distribution is built, reasonable price, the quality of a kind of suitable China's national situation of needs is really up to the mark, the 24kV outdoor high-voltage vacuum breaker of advanced technology.
Technical scheme of the present invention is: the outdoor pole vacuum circuit breaker of a kind of 24kV, its three-phase vacuum interrupter, main conductive circuit, insulated tension pole are formed the integrated pole of three-phase respectively, the integrated pole of three-phase is co-located on the cabinet, constitute the discrete unenclosed construction of three-phase, the clamping plate type spring operating mechanism is set in the cabinet, spring operating mechanism connects a transmission main shaft, and moving contact and transmission main shaft that three-phase vacuum extinction is indoor link by insulated tension pole; The three-phase vacuum interrupter all is encapsulated in the compound inslation of epoxy resin and silicon rubber, and the outside, junction between vacuum interrupter and the insulated tension pole is provided with gum sleeve.
Vacuum interrupter of the present invention is the R structure of contact terminal, moving contact, fixed contact set gradually outward and all press radome, arc control device ceramic shell, dielectric and external insulation layer, end, dynamic/static contact surface lead angle is 7mm, and the wedge angle of all pressing the radome end is for being the camber of radius with 0.5mm.
Spring operating mechanism of the present invention is the clamping plate type structure, comprise left and right sides clamping plate, stored energy mechanism, spring drive mechanism, combined floodgate spring, combined floodgate release, separating brake release, energy storage motor, left and right sides clamping plate by connecting axle connect and compose assembly building every, stored energy mechanism, spring drive mechanism place between two clamping plate, combined floodgate spring, combined floodgate release, separating brake release are installed in the clamping plate outside, combined floodgate spring one end connects hangs the spring connecting lever, the other end hangs on the hanging spring shaft that passes clamping plate bottom, the left and right sides, hangs the spring connecting lever and is connected with the energy storage axle of stored energy mechanism; Energy storage motor is a direct current permanent magnet motor, by sliding cross coupling and stored energy mechanism; The spring drive system comprises main shaft, output toggle arm, and the spring drive system is connected with the combined floodgate spring by four jointed gear units, and all connecting rods all adopt symmetry hinged, and the main shaft of spring drive system connects transmission main shaft.
The invention has the beneficial effects as follows: 1) overall structure adopts the discrete unenclosed construction of three-phase, has eliminated the threat of " inner condensation "; 2) insulation system adopts epoxy resin and silicon rubber compound inslation, and the structure insulation system of vacuum interrupter is improved, and has improved the insulation property of circuit breaker; 3) spring operating mechanism of miniaturization increases the switching force of spring operating mechanism simultaneously, makes it fully to satisfy the closing speed requirement of the outdoor circuit breaker of 24kV; 4) adopt special-purpose vacuum interrupter, rated current, operation-current and the operation-current open and close times of circuit breaker all are improved; Vacuum circuit-breaker of the present invention has been filled up the blank of domestic this kind equipment at the 24kV ultra-high-tension power transmission line, has reliability height, miniaturization, intellectuality, non-maintaining, characteristics that the short circuit current connecting-disconnecting function is strong.
Description of drawings
Fig. 1 is the invention structural representation.
Fig. 2 is a vacuum arc extinguish chamber structure schematic diagram of the present invention.
Fig. 3 opens apart from the potential image 100% time circuit breaker integral body for vacuum interrupter of the present invention.
Fig. 4 opens apart from the potential image 80% time circuit breaker integral body for vacuum interrupter of the present invention.
Fig. 5 opens apart from the potential image 50% time circuit breaker integral body for vacuum interrupter of the present invention.
Fig. 6 is a spring mechanism structural representation of the present invention.
Fig. 7 is the schematic diagram of spring operating mechanism combined floodgate holding unit scheme 1 of the present invention.
Fig. 8 is the schematic diagram of spring operating mechanism combined floodgate holding unit scheme 2 of the present invention.
Fig. 9 is the schematic diagram of spring operating mechanism combined floodgate holding unit scheme 3 of the present invention.
Among Fig. 2, support bar 1, energy storage motor 2, pinion 3, energy storage axle 4, gear wheel 5 is hung spring connecting lever 6, output toggle arm 7, separating brake pallet 8, separating brake connecting lever 9, separating brake semiaxis 10, separating brake release 11, hanging spring shaft 12, combined floodgate spring 13, combined floodgate semiaxis 14, combined floodgate pallet 15, main shaft 16, cam 17, combined floodgate semiaxis 18, combined floodgate release 19, support column 20, clamping plate 21.
Embodiment
Fig. 1 is the overall structure schematic diagram of vacuum circuit-breaker of the present invention, adopt the discrete unenclosed construction of three-phase, vacuum interrupter, main conductive circuit, insulation support etc. organically are combined into an integrated pole, the integrated pole of three-phase is co-located on the cabinet, device clamping plate type spring operating mechanism in the cabinet, spring operating mechanism connects transmission main shaft, and transmission main shaft spurs moving contact in the three-phase arc control device simultaneously by insulated tension pole, realizes branch, closing operation to circuit breaker.The whole three-phase column support type structure that adopts of vacuum circuit-breaker, this is simple for structure lucid and lively, and the design accuracy height is easy for installation, need not to adjust to satisfy the requirement that vacuum interrupter is opened the distance and the excess of stroke, and can avoid " inner condensation " problem of case structure appearance in the past.Casing adopts the antirust processing of Dacroment, prevents that effectively cabinet is out of shape under severe temperatures, and this is designed to hermetically sealed, all insulation, non-maintaining structure.Between vacuum interrupter and insulated tension pole gum sleeve is set, the outer surface of protection vacuum interrupter is not subjected to the pollution of surrounding environment.
The characteristics of the power equipment maximum of 24kV electric pressure are very high to the requirement of insulation property.Vacuum circuit-breaker of the present invention adopts the compound inslation mode of epoxy resin and silicon rubber, arc control device sleeve pipe and insulation column adopt the injection of APG technology to form by epoxy resin, and between vacuum interrupter and insulated tube, design gum sleeve, improved anti-ozone, uvioresistant, ageing resistance.
The vacuum interrupter of vacuum circuit-breaker is encapsulated in silicon rubber and the epoxy resin compound inslation, and arc control device sleeve pipe and insulation column adopt the injection of APG technology to form by epoxy resin, and its outside is provided with the silastic material of band full skirt.As Fig. 2, vacuum interrupter mainly comprises moving contact, fixed contact, all presses radome, arc control device ceramic shell, dielectric and external insulation, all presses radome, arc control device ceramic shell, dielectric and external insulation layer to be successively set on outside the dynamic and static contact.Adopt ANSYS software, the 24kV outdoor AC high-voltage vacuum circuit-breaker of the discrete column support type unenclosed construction of three-phase is carried out Calculation of Three-Dimensional Electric Fields: the arc control device internal gas is a vacuum, and relative dielectric constant is taken as 1; External insulation and insulated tension pole are epoxy resin, and the relative dielectric constant of epoxy resin is taken as 3.8; The relative dielectric constant of ceramic shell is taken as 6; The dielectric of filling is a silicon rubber, and relative dielectric constant is taken as 2.8; The relative dielectric constant of metallic copper is taken as 2000, and the dynamic/static contact of vacuum interrupter is opened apart from for 12mm, and radome is arranged in the arc control device, and it is a floating potential, in therefore calculating it is coupled.The different situations such as distance of opening of closing contact when closing according to contact of breaker with two stations of disjunction and disjunction, respectively arc control device are carried out analysis of electric field, establish Electric Field Distribution characteristics and field intensity centrostigma, the field intensity centrostigma is the key area that this paper analyzes, and the electric field result who is obtained under the various different situations is compared.
Investigation is under rated lightning impulse withstand voltage, insulation property between isolation fracture, with the fixed contact of the circuit breaker 125kV that adds high pressure, moving contact adds zero potential 0, draws out apart from respectively in the Potential distribution of 100%, 80%, 50% time circuit breaker integral body, as Fig. 3-5, because the existence of radome has suppressed electric field distortion, make the voltage of contact near zone distribute very even in the arc control device, and dynamic and static contact Potential distribution is symmetrical, and the floating potential on the radome is about 60kV; Vacuum circuit-breaker appears at the radome end in the 100% electric field strength maximum of opening under the distance, and its electric field strength is 1.81kV/mm, all presses radome to make near the voltage distribution gradient of contact, and electric-field intensity distribution is even, and the electric field strength between contact is bigger; Vacuum circuit-breaker appears at the radome end in the 80% electric field strength maximum of opening under the distance, and its electric field strength is 2.12kV/mm; Open under the distance 50%, the electric field strength maximum of vacuum circuit-breaker appears at the end of contact surface, and its electric field strength is 2.54kV/mm, and the electric field strength between contact is apparently higher than the preceding two kinds electric field strength of opening under the distance at this moment.
Certain and when being uniform dielectric when the external insulation medium as can be seen, relatively large local main of the Electric Field Distribution intensity of vacuum interrupter concentrated and is distributed in dynamic and static contact surface end and radome both ends up and down, and these insulation risks zones easily produce insulation breakdowns.Therefore, the present invention has strengthened the curvature of end, dynamic/static contact surface, end, dynamic/static contact surface lead angle is increased to 7mm by the 3mm of common contact, and the wedge angle at radome both ends is all pressed in passivation simultaneously, and it is the camber of radius that the wedge angle of radome end is changed into 0.5mm by original right angle.By above-mentioned improvement measure, the Electric Field Distribution situation of field intensity centrostigma obviously weakens.The electric field strength of vacuum extinction outdoor face is less relatively, the near zone that the ceramic shell two ends of vacuum extinction outdoor face and arc control device two end cover plate are close, and the electric field strength value is with respect to bigger along the electric field strength value of other surperficial positions.
When contacts for vacuum-break switches of the present invention is closed, the center conductor 125kV that adds high pressure, getting infinite boundary is zero potential 0, the inside or the outside electric field strength that are circuit breaker are all very little, wherein maximum field intensity is 0.08kV/mm, electric-field intensity distribution is even, is the center by contact, voltage distribution gradient trend on every side.
By above-mentioned improvement, insulating properties of the present invention meets relevant national standard and technological document regulation fully, insulation effect reach 1 minute industrial frequency withstand voltage alternate, over the ground/fracture is 50/65kV, that specified lightning impulse is withstand voltage is alternate, over the ground/fracture is 95/125kV
Fig. 6 is the schematic diagram of spring operating mechanism of the present invention; spring operating mechanism adopts the miniaturization Design principle; have motor or manually energy storage, electromagnetism or manually close branch, excess current protective function, for realize controller that overcurrent protection is disposed have shove, time-delay and fast tripping protection function.Integral arrangement adopts the clamping plate type structure, left and right sides clamping plate 21 by connecting axle connect and compose assembly building every, stored energy mechanism comprises energy storage axle 4, pinion 3, gear wheel 5, spring drive mechanism comprises main shaft 16, output toggle arm 7, stored energy mechanism and spring drive mechanism place between two clamping plate, and combined floodgate spring 13, combined floodgate release 19, separating brake release 11 are installed in the clamping plate outside.Combined floodgate spring 13 1 ends connect hangs spring connecting lever 6, and the other end hangs on the hanging spring shaft 12 that passes clamping plate bottom, the left and right sides.Each parts of entire mechanism are stressed rationally, and good stability, release are installed and changed conveniently, and single-row radial ball bearing all is equipped with at all two ends, make assembling good, rotate flexibly, efficient is high.Energy storage motor 2 adopts direct current permanent magnet motor, because its characteristic is harder, so energy storage time is stable, add bridge rectifier, can be used for alternating current operation, energy storage motor 2 links to each other with stored energy mechanism by sliding cross coupling, slow down by the secondary roller gear, be the pinion 3 and the gear wheel 5 of stored energy mechanism, drive energy storage axle 4 and rotate that tension combined floodgate spring 13 carries out energy storage.The 24kV circuit breaker is very high to the requirement of mechanism's combined floodgate characteristic, mechanism must satisfy enough big switching force, the spring drive system is connected with the combined floodgate spring by four jointed gear units, all connecting rods all adopt symmetry hinged, four jointed gear units are reflected in combined floodgate semiaxis 18, output toggle arm 7, cam 17, be designed to quadric chain between the main shaft 16, stressed reasonable, power increases, all connecting rods all adopt symmetry hinged, consider 24kV vacuum circuit-breaker load properties, make overtravel stage that four connecting rods are operated in circuit breaker near the dead band, mechanical advantage heightens, and the switching force reinforcement effect of spring mechanism is obvious.The main shaft of spring drive system connects transmission main shaft.
Close a floodgate and the reclosing process:
When carrying out closing operation, apply voltage for combined floodgate release 19, combined floodgate semiaxis 18 is rotated counterclockwise, the energy storage of removing combined floodgate pallet 15 keeps, and combined floodgate spring 13 releases energy, and impels cam 17 rotations and drives output toggle arm 7 and main shaft 16.When combined floodgate will be finished, separating brake connecting lever 9 fastened separating brake semiaxis 10, made circuit breaker be in "on" position, and separating brake pallet 8 is 1.5～2.5mm with the snapping amount of separating brake semiaxis 10.
Mechanism is under "on" position, and when operating stored energy mechanism once more, the combined floodgate spring is elongated again, still keeps the energy storage states by combined floodgate pallet 15 after during spring is crossed.
Mechanism promptly is under the reclosing standby condition under the energy storage state that closes a floodgate, can realize the operation of " branch-0.3S-closes branch " single shot reclosing.
Separating brake and overcurrent release process:
Behind the breaker closing; apply voltage for separating brake release 11; separating brake semiaxis 10 is rotated counterclockwise; separating brake pallet 8 is triped, and breaker open operation is when the electric current that passes through when the overcurrent coil on the separating brake release reaches 5A equally; 11 actions of separating brake release; separating brake pallet 8 is triped, and breaker open operation is realized overcurrent protection.
It is separating brake pallet 8 that the influence combined floodgate keeps the principal element of reliability, and the stress that it is subjected to is that sluice separating spring 13 provides, and regards its duty cycle number as stress, regards intensity fatigue life as, their equal obeys logarithm normal distribution.The formula that calculates its reliability is:
In the formula: μ
1n δ, σ
1n δCan be obtained by table 1 carbon steel fatigue behaviour data, its value is pressed logarithm normal distribution with open and close times and is changed μ
1nS=5.000, σ
1nS=0.0700.
Table 1
Promptly to close a floodgate sincere sub 15 are series relationship for stored energy mechanism and energy storage holding unit in the spring operating mechanism, are that separating brake connecting lever 9 is relations in parallel with the combined floodgate holding unit.If the linkage structure reliability is 1, stored energy mechanism, energy storage holding unit, combined floodgate holding unit, spring operating mechanism reliability are respectively R
1(t), R
2(t), R
3(t) R
S(t).R
S(t)=1-[1-R
S1(t)] * [1-R
3(t)] in the formula: R
S1(t)=R
1(t} * R
2(t) be the whole reliability of energy storage section.
Design spring operating mechanism combined floodgate holding unit has three kinds of schemes selective, and the structure chart of three kinds of schemes is shown in Fig. 7-9, and the characteristics of each scheme are listed in the table 2.Output toggle arm 7 acts directly on the separating brake connecting lever 9 in the scheme one, separating brake sincere sub 8 adopts serial verb construction with separating brake connecting lever 9 in the scheme two, output toggle arm 7 acts on the separating brake connecting lever 9 by separating brake sincere sub 8, scheme three has increased torsion spring 81 in the junction of separating brake sincere sub 8 and separating brake connecting lever 9 on the basis of scheme two.Calculate through the following formula formula, when running to 5000 times, the reliability of scheme two just has only 0.12607695, and the reliability of scheme three is 0.50143182, and obviously the reliability of scheme three will be higher than scheme two, thereby adopts scheme three in practice.
Table 2
| Scheme | Characteristics |
| One | The secondary fastening structure, plane and semiaxis snapping, anti-strike ability is strong, and divide-shut brake is unreliable |
| Two | Three grades of fastening structures, plane and semiaxis snapping, divide-shut brake is reliable.But when being in 4000-5000 time, A ruptures, the fracture easily of A, B place, and the C place is yielding |
| Three | Now use structure, three grades of fastening structures, plane and semiaxis snapping, divide-shut brake is reliable, changes the separating brake connecting lever into the one foundry goods, and number of parts is reduced |
(it aims at the 24kV design to the 6105B that the vacuum interrupter that this circuit breaker uses uses BOE to produce for 24KV/1600,1250A-25KA) type.Blow-out and suppress electric current rapidly after by the good insulating properties of vacuum in managing high-tension circuit being cut off the electricity supply, the arcing time is short, arc voltage is low, arc energy is little, the contact abrasion less, the open and close times that allows is many.Adopt the R contact design in the design, form the high strength longitudinal magnetic field, connecting-disconnecting function is strong, the reliability height; Contact is integrated, no striking groove, and the morphology perfection, withstand voltage height, mechanical strength is good, and moving process does not have distortion; Arc control device home loop resistance is little, and internal electric field is even, and the contact shut off value is low, has the ability of cutting capacitive, inductive load reliably.Arc control device adopt the special stainless steel soldering tech, need not to electroplate, and the welding quality height, reliable and stable, leak rate is low.Use special ceramic metallization prescription and advanced ceramic metalizing process on the manufacture craft, guaranteed the air-tightness of product, tensile strength is greater than 130Mpa, fully one-step seal-exhaust.Make the rated current of circuit breaker reach 1250A, rated short circuit drop-out current 25kA, rated short circuit drop-out current open and close times 30 times satisfies and has surpassed the regulation of relevant national standard.
Claims (5)
1, the outdoor pole vacuum circuit breaker of a kind of 24kV, it is characterized in that three-phase vacuum interrupter, main conductive circuit, insulated tension pole form the integrated pole of three-phase respectively, the integrated pole of three-phase is co-located on the cabinet, constitute the discrete unenclosed construction of three-phase, the clamping plate type spring operating mechanism is set in the cabinet, spring operating mechanism connects a transmission main shaft, and moving contact and transmission main shaft that three-phase vacuum extinction is indoor link by insulated tension pole; The three-phase vacuum interrupter all is encapsulated in the compound inslation of epoxy resin and silicon rubber, and the outside, junction between vacuum interrupter and the insulated tension pole is provided with gum sleeve.
2, the outdoor pole vacuum circuit breaker of 24kV according to claim 1, it is characterized in that vacuum interrupter is the R structure of contact terminal, moving contact, fixed contact set gradually outward and all press radome, arc control device ceramic shell, dielectric and external insulation layer, end, dynamic/static contact surface lead angle is 7mm, and the wedge angle of all pressing the radome end is for being the camber of radius with 0.5mm.
3, the outdoor pole vacuum circuit breaker of 24kV according to claim 1 and 2, it is characterized in that spring operating mechanism is the clamping plate type structure, comprise left and right sides clamping plate, stored energy mechanism, spring drive mechanism, the combined floodgate spring, the combined floodgate release, the separating brake release, energy storage motor, left and right sides clamping plate by connecting axle connect and compose assembly building every, stored energy mechanism, spring drive mechanism places between two clamping plate, the combined floodgate spring, the combined floodgate release, the separating brake release is installed in the clamping plate outside, combined floodgate spring one end connects hangs the spring connecting lever, the other end hangs on the hanging spring shaft that passes clamping plate bottom, the left and right sides, hangs the spring connecting lever and is connected with the energy storage axle of stored energy mechanism; Energy storage motor is a direct current permanent magnet motor, by sliding cross coupling and stored energy mechanism; The spring drive system comprises main shaft, output toggle arm, and the spring drive system is connected with the combined floodgate spring by four jointed gear units, and all connecting rods all adopt symmetry hinged, and the main shaft of spring drive system connects transmission main shaft.
4, the outdoor pole vacuum circuit breaker of 24kV according to claim 1 and 2 is characterized in that 6105B (24KV/1600,1250A-25KA) type that vacuum interrupter uses BOE to produce.
5, the outdoor pole vacuum circuit breaker of 24kV according to claim 3 is characterized in that 6105B (24KV/1600,1250A-25KA) type that vacuum interrupter uses BOE to produce.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100240692A CN101345157A (en) | 2008-04-24 | 2008-04-24 | Vacuum circuit breaker on 24kV outdoor column |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100240692A CN101345157A (en) | 2008-04-24 | 2008-04-24 | Vacuum circuit breaker on 24kV outdoor column |
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| CN101345157A true CN101345157A (en) | 2009-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100240692A Pending CN101345157A (en) | 2008-04-24 | 2008-04-24 | Vacuum circuit breaker on 24kV outdoor column |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102568716A (en) * | 2010-11-30 | 2012-07-11 | 株式会社东芝 | Insulating supporting apparatus and manufacturing method thereof |
| CN102779679A (en) * | 2012-07-24 | 2012-11-14 | 吉林省达美电器设备有限公司 | Circuit breaker |
-
2008
- 2008-04-24 CN CNA2008100240692A patent/CN101345157A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102568716A (en) * | 2010-11-30 | 2012-07-11 | 株式会社东芝 | Insulating supporting apparatus and manufacturing method thereof |
| CN102568716B (en) * | 2010-11-30 | 2015-07-01 | 株式会社东芝 | Insulating supporting apparatus and manufacturing method thereof |
| CN102779679A (en) * | 2012-07-24 | 2012-11-14 | 吉林省达美电器设备有限公司 | Circuit breaker |
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Open date: 20090114 |