CN200953325Y - Bidirectional energy-storing high-speed breaking contact used for ultrahigh voltage circuit breaker - Google Patents
Bidirectional energy-storing high-speed breaking contact used for ultrahigh voltage circuit breaker Download PDFInfo
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- CN200953325Y CN200953325Y CN 200620010076 CN200620010076U CN200953325Y CN 200953325 Y CN200953325 Y CN 200953325Y CN 200620010076 CN200620010076 CN 200620010076 CN 200620010076 U CN200620010076 U CN 200620010076U CN 200953325 Y CN200953325 Y CN 200953325Y
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- contact
- resistance
- moving contact
- insulation
- arc extinguishing
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- Circuit Breakers (AREA)
Abstract
The utility model relates to a contact for ultrahigh-voltage circuit breaker, in particular to a bidirectional energy-storage high-speed break contact applicable to ultrahigh-voltage circuit breaker, which comprises an insulating shell, an insulating sleeve in the insulating shell, a static contact and a moving contact in the insulating sleeve. Wherein, the static contact is connected with the moving contact through a restorable spring to make the contact move towards the opposite direction at accelerated speed through the spring energy during tripping. The utility model is provided with the function of speed multiplying tripping, hence reducing electric arc and over-voltage during switching-on virgule off.
Description
Technical field
The utility model relates to the contact that a kind of breaker in extra high voltage uses, and is particularly useful for the bidirectional energy-storage high speed break contact of breaker in extra high voltage.
Background technology
The power equipment switch often will be used circuit breaker, The faster the better, the time is short more good more to require breaking speed in the time of as high pressure or breaker in extra high voltage use, because the moving contact of high voltage electric equipment and fixed contact are easy to generate electric arc in the time of approaching, the time of the fast more generation electric arc of breaking speed is short more, and is more little to the infringement of equipment.In addition, the alive circuit that long distance is non-loaded or load is very little minute, can in electrical network, form very high switching overvoltage when closing a floodgate.If the special equipment of these overvoltage neither ones is limited, in extra-high voltage grid, will take excessive insulation measures so, and this will inevitably increase considerably cost.The effective way of restriction switching overvoltage is exactly to come these circuit are switched with the circuit breaker that branch, switching-on resistance be housed, and divides, switching-on resistance can be with overvoltage Limiting a relatively low level.The existing primary cut-out contact that has switching-on resistance, FXT16D type SF6 contact of breaker with Alstom (China) company (ALSTOM) is representative, be made up of the moving contact and the fixed contact that are installed in the insulation cavity, fixed contact is fixedly mounted in the insulation cavity, is connected with switching-on resistance; Moving contact is hinged on the insulated tension pole, the speed of related movement of moving contact and fixed contact depends on the movement velocity of insulated tension pole, in order to improve the breaking speed of switch, has only the movement velocity that improves insulated tension pole, and this can increase substantially production cost and power consumption, the movement velocity of insulated tension pole can cause bigger motion impulsive force again after improving simultaneously, influences the useful life of equipment.My another patent application " four pole multi speed disjunction contact of extra-high-voltage breaker " (application number CN200510112962.7) provides a kind of high speed break contact, when separating brake moves, moving contact and fixed contact move simultaneously in the opposite direction, greatly improved the breaking speed of contact, the breaking capacity of circuit breaker is greatly improved.But this contact only inserts switching-on resistance when closing a floodgate, can avoid closing overvoltage, but can not avoid the gate-dividing super-voltage phenomenon.Simultaneously, this contact is because the contact is more, between each contact the interoperation time longer, cause motion overall operation distance, operating mechanism consumed energy big.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency, provide a kind of simple and reasonable for structure reliable, with low cost, breaking speed is fast, and the bidirectional energy-storage high speed break contact that is used for breaker in extra high voltage of quenching resistance is installed simultaneously.
For achieving the above object, the utility model adopts following technical scheme:
The bidirectional energy-storage high speed break contact that is used for breaker in extra high voltage described in the utility model comprises insulation crust, is installed in the insulating sleeve in the insulation crust and is arranged on fixed contact and moving contact in the insulating sleeve; Be positioned at the fixedly connected resistance box of a side of fixed contact at insulation crust; Fixed contact comprises the insulation guide plate that is fixedly installed in the insulating sleeve and is inserted into main contacts, resistance contact point and the arcing contact of insulation on the guide plate, is fixedly installed on the end casing of insulating sleeve end face, main contacts, resistance contact point and arcing contact are connected with insulation guide plate elasticity by spring respectively, main contacts is electrically connected by flexible conductor with the arcing contact, and the end of main contacts is electrically connected with the connecting rod that fixedly is inserted in the end casing; Elastic movement gap between main contacts and the insulation guide plate is less than the elastic movement gap between arcing contact and the insulation guide plate; Elastic movement gap between resistance contact point and the insulation guide plate is greater than the elastic movement gap between arcing contact and the insulation guide plate; The end of resistance contact point is electrically connected with the resistance binding post that fixedly is inserted in the end casing by flexible conductor; Moving contact comprises interior insulation support plate, the external insulation supporting bracket that is fixedly installed in the insulating sleeve and is inserted into arc extinguishing moving contact in the two-layer insulation support plate, be installed with conductive plate on the arc extinguishing moving contact, conductive plate is between interior insulation support plate and external insulation supporting bracket; Initiatively contact and resistance moving contact link together by this conductive plate and arc extinguishing moving contact, in initiatively contact, resistance moving contact, arc extinguishing moving contact are inserted on the insulation support plate, its position is corresponding with main contacts, resistance contact point, arcing contact respectively, be provided with cylinder sleeve with resistance moving contact, the corresponding position of arc extinguishing moving contact on the interior insulation support plate, the stage casing of resistance moving contact, arc extinguishing moving contact has piston, and form piston with the inwall of cylinder sleeve and cooperate, the end of arc extinguishing moving contact has connecting plate; Resistance box comprises housing and the quenching resistance, the connecting rod extension rod that are fixedly mounted in the housing, the two ends of housing fixedly mount the resistance box end cap respectively, the two ends of quenching resistance and connecting rod extension rod all are inserted in the resistance box end cap, stretch out the plug that is partly with of resistance box end cap, one end plug matches with resistance binding post and connecting rod on the fixed contact, and other end plug is plugged on metal end caps; It is characterized in that: initiatively the contact is fixedly connected on the conductive plate, and the resistance moving contact is actively plugged on the conductive plate, connects by energy-stored spring between the two.
Above-mentioned insulating sleeve comprises urceolus and is sleeved on inner core in the urceolus, and inner core is a segmental structure, and insulation guide plate, interior insulation support plate and external insulation supporting bracket are installed in the junction of each segmentation of inner core;
Under gate-dividing state, main contacts the and initiatively distance between the contact is maximum, the distance between arcing contact and the arc extinguishing moving contact secondly, between resistance contact point and the resistance moving contact apart from minimum;
The arcing contact be positioned at the insulation guide plate the center, a plurality of main contactss and resistance contact point be looped around the arcing contact around;
One side of arc extinguishing moving contact and resistance moving contact is provided with the arc blow-out pipe, and the top of arc blow-out pipe is respectively towards the top of arc extinguishing moving contact and resistance moving contact, and the piston on arc extinguishing moving contact or the resistance moving contact is run through in its lower end; Have the exhaust outlet that unidirectional valve is installed on the piston.
After adopting technique scheme, the utlity model has following advantage:
1, resistance adopts the grouping disjunction, can satisfy the requirement to resistance of combined floodgate and separating brake simultaneously, and the power that can reduce resistance consumption is more than 60%, and makes branch, closing overvoltage value drop to ideal value.
When 2, the separating brake action begins, by compressed energy-storage spring energy accumulation, the later stage of disjunction action, energy-stored spring discharges, promote the resistance moving contact and quicken to move, further improve the speed of separating brake, strengthened the arc extinguishing ability, also shorten the displacement of motion simultaneously, reduced mechanism's energy consumption.
3, owing to the effect of energy-stored spring, the move distance when making the resistance contact point separating brake shortens, and has reduced the suffered impulsive force of resistance contact point, makes whole device operation more reliable and more stable.
Description of drawings
Fig. 1 is the structural representation of the break-up device of an embodiment of the present utility model;
Fig. 2 is the structural representation of resistance box;
Fig. 3 is the B-B cutaway view of Fig. 1;
Fig. 4 is the A-A cutaway view of Fig. 2;
Embodiment
As Fig. 1, shown in Figure 3, the bidirectional energy-storage high speed break contact that is used for breaker in extra high voltage described in the utility model comprises insulation crust 1, be installed in the insulating sleeve 7 of insulation crust 1 and be arranged on fixed contact and moving contact in the insulating sleeve 7, and the resistance box that is fixedly mounted on insulation crust 1 one ends.The outside of insulation crust 1 has the magnetic skirt, has air chamber 77 between insulation crust 1 and the insulating sleeve 7, can fill insulating gass such as SF6 in the air chamber 77, also can fill insulating cement, to improve insulation effect.
In addition, for ease of installing, insulating sleeve 7 can also be designed to the structure of can segmentation installing.Insulating sleeve 7 comprises urceolus and is sleeved on inner core in the urceolus, and inner core is a segmental structure, and the parts of horizontally sets such as insulation guide plate 34, interior insulation support plate 72 and external insulation supporting bracket 73 are installed in the junction of each segmentation of inner core.In the production process, as long as sectional assembly segmentation is fitted together.Certainly, insulating sleeve 7 also can be designed to the integral structure of not segmentation.
Fixed contact comprises the insulation guide plate 34 that is fixedly installed in the insulating sleeve 7 and is inserted into main contacts 31, resistance contact point 32 and the arcing contact 33 of insulation on the guide plate 34, is fixedly installed on the end casing 50 of insulating sleeve 7 end faces.Arcing contact 33 is positioned at the center of insulation guide plate 34, spring 10 is sleeved on the arcing contact 33, and by be fixed on the arcing contact 33 spring base with spring 10 be fixed on spring base and the insulation guide plate 34 between, be fixed with the positioning tube 101 of tubular on the insulation guide plate 34 of spring base below, be enclosed within the outside of spring 10.Main contacts 31, resistance contact point 32 and arcing contact 33 all adopt this similar structure to be connected with insulation guide plate 34 elasticity by spring respectively.The effect of positioning tube 101 is spring can be located on the one hand, also just can adjust the movement clearance of arcing contact 33 by the height of adjusting positioning tube 101 on the other hand, so that match with the time difference of other contacts.As shown in Figure 3, main contacts 31 and resistance contact point 32 respectively have three, spacer ring around be arranged on arcing contact 33 around.Be provided with by this annular, the diameter of arcing contact 33 is significantly increased, the curvature on top reduces, and can effectively reduce the resume combustion of capacitive electric arc.In addition, main contacts 31 separate with resistance contact point 32 be provided with after, the motional inertia of contact reduces, the speed of help improving branch, closing a floodgate.Main contacts 31 and arcing contact 33 are electrically connected by flexible conductor, and the end of main contacts 31 is electrically connected with connecting rod 37 in fixedly being inserted into end casing 50, and arcing contact 33 is inserted in the connecting rod 37 slidably; When designing the length of each contact, make main contacts 31 and the elastic movement gap of insulation between the guide plate 34 less than arcing contact 33 and the elastic movement gap of insulating between the guide plate 34; Elastic movement gap between resistance contact point 32 and the insulation guide plate 34 is greater than the elastic movement gap between arcing contact 33 and the insulation guide plate 34; The end of resistance contact point 32 is electrically connected with resistance binding post 51 in fixedly being inserted into end casing 50 by flexible conductor;
For guarantee that main contacts 31 does not produce electric arc when closing a floodgate, guarantee quenching resistance 352 effective turn-on time, prevent closing overvoltage, under gate-dividing state, should guarantee that the distance between main contacts 31 and the active contact 141 is maximum, distance between arcing contact 33 and the arc extinguishing moving contact 143 secondly, the distance minimum between resistance contact point 32 and the resistance moving contact 142.That is to say that as shown in this embodiment, under the identical situation of each contact length of moving contact, the main contacts 31 on the fixed contact is the shortest, takes second place in arcing contact 33, and resistance contact point 32 is the longest.
As shown in Figure 4, quenching resistance 352 is divided into three groups, is electrically connected with three resistance contact points 32 by lead, resistance binding post 51 respectively.The installation method of main contacts 31 and resistance contact point 32 is identical with arcing contact 33, and just according to its different effect, the movement clearance of each contact is different.Elastic movement gap between main contacts 31 and the insulation guide plate 34 is less than the elastic movement gap between arcing contact 33 and the insulation guide plate 34; Elastic movement gap between resistance contact point 32 and the insulation guide plate 34 is greater than the elastic movement gap between arcing contact 33 and the insulation guide plate 34.Concrete numerical value can calculate as required.Do not do further argumentation at this.
Certainly, initiatively the quantity of contact 141, resistance moving contact 142 is not limited to three, also can be two or more.Perhaps change distance between each contact, as long as the distance relation between each contact is with above-mentioned consistent by the length of adjusting each contact on the moving contact.
In addition, molecular sieve 71 devices such as grade can also be set in insulating sleeve 7.Molecular sieve 71 can be inlaid on the insulation guide plate 34.Certainly, also can adopt other mounting means, molecular sieve 71 can also be arranged in the insulating sleeve 7 as independent one deck as present embodiment.
When contact is initially at engagement state, main contacts 31 contact with contact 141 initiatively, and electric current is directly by active contact 141 and main contacts 31 conductings.When receiving breaking signal, operating mechanism drives moving contact and moves downward, and fixed contact overcomes spring under each contact frictional force effect of moving contact elastic force moves downward together.Meanwhile, spring 10 is compressed under the effect of each contact, and when the spring base lower end on each contact of fixed contact moved to positioning tube 101 places, the tube 101 that is positioned stopped, no longer move downward, and moving contact continues to move downward.
Because the free gap minimum of main contacts 31, what therefore at first disconnect is main contacts 31 and active contact 141.And this moment, resistance contact point 32, arcing contact 33 also engage with resistance moving contact 142, arc extinguishing moving contact 143 respectively, overwhelming majority electric currents are through arcing contact 33 and arc extinguishing moving contact 143, so main contacts 31 and initiatively can not produce electric arc 141 disjunctions of contact the time.
At this moment, moving contact continues to move downward, and separate with arc extinguishing moving contact 143 arcing contact 33, under the double action of brake separating mechanism power and spring force, arcing contact 33 and arc extinguishing moving contact 143 move round about with the relative velocity that doubles brake separating mechanism, and electric arc extinguishes rapidly.When cutting off big electric current, the heat energy that electric arc produces expands arc control device gas rapidly, promotes moving contact and quickens to move downward, and electric arc is extinguished more rapidly.Arc extinguishing efficient during for the little electric current of further raising, side at arc extinguishing moving contact 143 is provided with arc blow-out pipe 145, when arc extinguishing moving contact 143 produces Compressed Gas for 144 li at cylinder sleeve when the separating brake direction moves, these gases blow to arc extinguishing moving contact 143 tops by arc blow-out pipe 145, and electric arc is blown out.The effect that exhaust outlet 41 is set is can pass through exhaust outlet 41 air inlets when arc extinguishing moving contact 143 when the combined floodgate direction moves, avoids producing vacuum in cylinder sleeve 144 speed that influence is closed a floodgate.
Because the elastic movement gap maximum of resistance contact point 32, therefore resistance contact point 32 separates at last with resistance moving contact 142 in the separating brake process.33 separate the about 30 milliseconds of resistance contact points 32 in back and just separate with resistance moving contact 142 with arc extinguishing moving contact 143 in the arcing contact, make quenching resistance 352 guarantee effective turn-on time when separating brake, can prevent to produce gate-dividing super-voltage.Certainly, concrete parameter can be provided with according to actual needs, is not described further at this.For example, 3 resistance contact heads contact simultaneously during combined floodgate, reduce closing overvoltage; And be adjustable to during separating brake two separate in advance, the 30 milliseconds of separation that lag behind, when reducing gate-dividing super-voltage, can also reduce resistance capacity.
Because main contacts 31, resistance contact point 32 and arcing contact 33 all are to be connected on the insulation guide plate 34 by spring floating, therefore these three contacts all have the ability of doubly fast disjunction when separating, promptly moving contact and fixed contact move respectively in the opposite direction in separating process, speed of related movement is fast, and arc quenching effect is good.Because the spring on the resistance contact point 32 is bigger than energy-stored spring 1423 hardness, at resistance contact point 32 with before resistance moving contact 142 separates, because the motion of conductive plate 1421, energy-stored spring 1423 at first is compressed energy storage, resistance moving contact 142 ability setting in motions, and pulling resistance contact point 32 then, spring on the compression resistance contact 32, with after resistance moving contact 142 separates, energy-stored spring 1423 discharges up to resistance contact point 32, promotes 142 accelerated motions of resistance moving contact.Improve the separating rate of resistance contact point 32 and resistance moving contact 142 on the one hand, also can shorten the move distance of driving mechanism on the other hand, the easier designing requirement of satisfying the 33 30 milliseconds of separation in 142 hysteresis arcing contacts of resistance moving contact.
During feed motion, drive unit drives moving contact and moves upward, because resistance contact point 32 is the longest, that is to say that the distance between resistance contact point 32 and the resistance moving contact 142 is minimum, therefore, resistance contact point 32 is at first connected with resistance moving contact 142, with quenching resistance 352 places in circuit, resistance contact point 32 is connected about 10 milliseconds of back with resistance moving contact 142, and arcing contact 33 is connected with arc extinguishing moving contact 143, main circuit is connected, and the electric current in the main circuit is by arcing contact 33 and 143 conductings of arc extinguishing moving contact; Be only main contacts 31 and initiatively contact 141 connections at last.Because quenching resistance 352 inserted before main circuit was connected, and circuit is charged in advance, the steepness that line voltage waveform changes when making the main circuit conducting slows down, thereby avoids producing closing overvoltage.During combined floodgate; if close a floodgate on the electric network fault circuit; can produce bigger combined floodgate electric arc; but because arcing contact 33 is connected earlier; therefore most electric arc all is created on the arcing contact 33; main contacts 31 can not produce electric arc almost connecting with active contact 141 under the idiostatic situation, and protection main contacts 31 is not burnt out.
Claims (2)
1, the bidirectional energy-storage high speed break contact that is used for breaker in extra high voltage comprises insulation crust (1), is installed in the insulating sleeve (7) in the insulation crust (1) and is arranged on fixed contact and moving contact in the insulating sleeve (7); Be positioned at the fixedly connected resistance box of a side of fixed contact at insulation crust (1); Fixed contact comprises the insulation guide plate (34) that is fixedly installed in the insulating sleeve (7) and is inserted into main contacts (31) in insulation guide plate (34), resistance contact point (32) and arcing contact (33), be fixedly installed on the end casing (50) of insulating sleeve (7) end face, main contacts (31), resistance contact point (32) is connected with insulation guide plate (34) elasticity by spring respectively with arcing contact (33), main contacts (31) is electrically connected by flexible conductor with arcing contact (33), and the end of main contacts (31) is electrically connected with connecting rod (37) in fixedly being inserted into end casing (50); Elastic movement gap between main contacts (31) and the insulation guide plate (34) is less than the elastic movement gap between arcing contact (33) and the insulation guide plate (34); Elastic movement gap between resistance contact point (32) and the insulation guide plate (34) is greater than the elastic movement gap between arcing contact (33) and the insulation guide plate (34); The end of resistance contact point (32) is electrically connected with resistance binding post (51) in fixedly being inserted into end casing (50) by flexible conductor; Moving contact comprises interior insulation support plate (72), the external insulation supporting bracket (73) that is fixedly installed in the insulating sleeve (7) and is inserted into arc extinguishing moving contact (143) in the two-layer insulation support plate, be installed with conductive plate (1421) on the arc extinguishing moving contact (143), conductive plate (1421) is positioned between insulation support plate (72) and the external insulation supporting bracket (73); Initiatively contact (141) and resistance moving contact (142) link together by this conductive plate (1421) and arc extinguishing moving contact (143), active contact (141), resistance moving contact (142), arc extinguishing moving contact (143) is inserted on the interior insulation support plate (72), its position respectively with main contacts (31), resistance contact point (32), arcing contact (33) is corresponding, interior insulation support plate (72) is gone up and resistance moving contact (142), the corresponding position of arc extinguishing moving contact (143) is provided with cylinder sleeve (144), resistance moving contact (142), have piston on the arc extinguishing moving contact (143), and form piston with the inwall of cylinder sleeve (144) and cooperate, the end of arc extinguishing moving contact (143) has connecting plate (1422); Resistance box comprises housing (351) and is fixedly mounted on quenching resistance (352), connecting rod extension rod (371) in the housing (351), the two ends of housing (351) fixedly mount resistance box end cap (353,354) respectively, the two ends of quenching resistance (352) and connecting rod extension rod (371) all are inserted in the resistance box end cap (353,354), stretch out the plug that is partly with of resistance box end cap (353,354), one end plug matches with resistance binding post (51) and connecting rod (37) on the fixed contact, and other end plug is plugged on metal end caps (355); It is characterized in that: initiatively contact (141) are fixedly connected on the conductive plate (1421), and resistance moving contact (142) is actively plugged on the conductive plate (1421), connect by energy-stored spring (1423) between the two.
2, the bidirectional energy-storage high speed break contact that is used for breaker in extra high voltage according to claim 1, it is characterized in that: described insulating sleeve (7) comprises urceolus and is sleeved on inner core in the urceolus, inner core is a segmental structure, and insulation guide plate (34), interior insulation support plate (72) and external insulation supporting bracket (73) are installed in the junction of each segmentation of inner core;
Under gate-dividing state, main contacts (31) the and initiatively distance between contact (141) is maximum, the distance between arcing contact (33) and the arc extinguishing moving contact (143) secondly, between resistance contact point (32) and the resistance moving contact (142) apart from minimum;
Arcing contact (33) be positioned at the insulation guide plate (34) the center, a plurality of main contactss (31) and resistance contact point (32) be looped around arcing contact (33) around;
One side of arc extinguishing moving contact (143) and resistance moving contact (142) is provided with arc blow-out pipe (145), the top of arc blow-out pipe (145) is respectively towards the top of arc extinguishing moving contact (143) and resistance moving contact (142), and the piston on arc extinguishing moving contact (143) or the resistance moving contact (142) is run through in its lower end; Have the exhaust outlet (41) that unidirectional valve is installed on the piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620010076 CN200953325Y (en) | 2006-09-25 | 2006-09-25 | Bidirectional energy-storing high-speed breaking contact used for ultrahigh voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620010076 CN200953325Y (en) | 2006-09-25 | 2006-09-25 | Bidirectional energy-storing high-speed breaking contact used for ultrahigh voltage circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN200953325Y true CN200953325Y (en) | 2007-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620010076 Expired - Lifetime CN200953325Y (en) | 2006-09-25 | 2006-09-25 | Bidirectional energy-storing high-speed breaking contact used for ultrahigh voltage circuit breaker |
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| CN (1) | CN200953325Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100414655C (en) * | 2006-09-25 | 2008-08-27 | 王光顺 | Bidirectional energy-storage high-speed disjunction contact for extra-high voltage breaker |
| CN102360850A (en) * | 2011-07-18 | 2012-02-22 | 句容华源电器设备有限公司 | Capacitance switch for transformer |
| CN109087828A (en) * | 2018-08-09 | 2018-12-25 | 西安中熔电气股份有限公司 | A kind of contactor construction of novel belt excitation cutting function |
-
2006
- 2006-09-25 CN CN 200620010076 patent/CN200953325Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100414655C (en) * | 2006-09-25 | 2008-08-27 | 王光顺 | Bidirectional energy-storage high-speed disjunction contact for extra-high voltage breaker |
| CN102360850A (en) * | 2011-07-18 | 2012-02-22 | 句容华源电器设备有限公司 | Capacitance switch for transformer |
| CN109087828A (en) * | 2018-08-09 | 2018-12-25 | 西安中熔电气股份有限公司 | A kind of contactor construction of novel belt excitation cutting function |
| CN109087828B (en) * | 2018-08-09 | 2024-05-07 | 西安中熔电气股份有限公司 | Novel contactor structure with excitation cutting-off function |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20060925 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |