CN101409159A - Contact device with different contact forces in different operating states - Google Patents
Contact device with different contact forces in different operating states Download PDFInfo
- Publication number
- CN101409159A CN101409159A CNA2008101618985A CN200810161898A CN101409159A CN 101409159 A CN101409159 A CN 101409159A CN A2008101618985 A CNA2008101618985 A CN A2008101618985A CN 200810161898 A CN200810161898 A CN 200810161898A CN 101409159 A CN101409159 A CN 101409159A
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- Prior art keywords
- contact
- line segment
- conducting line
- contacts
- section
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
- H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
- H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
- H01H77/101—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening with increasing of contact pressure by electrodynamic forces before opening
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
- H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
- H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
- H01H77/107—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by the blow-off force generating means, e.g. current loops
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
- H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The contact device for circuit breaker or protection switch is required to optimize in the aspect of abrasion and power loss. The contact device has a first contact (1) having a first conduction section (3); and a second contact (2) including a second conductor section (6) running fundamentally parallel to the first conduction section, a fourth conductor section (8) and a bend section (7). The second conductor section (6) has a first end (6-1) and a second end (6-2), the bend section (7) is connected to the first end (6-1) of the second conductor section (6) and the fourth conductor section (8), and the fourth conductor section (8) is conducted to a third conductor section (9). The second conductor section (6) possesses a first contact point (5) in the first end (6-1). The third conductor section (9) possesses a second contact point (10). The first contact (1) is contacted with a first and a second contact points (5, 10) or only the second contact point (10) in a first position. The movable contact is exclusively contacted with the second contact point (5) in a second position.
Description
Technical field
The present invention relates to a kind of contact device; especially be applied to line protection switch or circuit breaker; wherein; this contact device is provided with first contact with first conducting line segment; and second contact; this second contact has second parallel with the first conducting line segment basically conducting line segment, and wherein two contacts are electrically connected mutually in first and second positions, and the electricity separation each other in the 3rd position.Different positions corresponds respectively to different running statuses.
Background technology
The contact system of line protection switch or circuit breaker can be designed in this wise, promptly when electric current flows on current collector effect have and do not inhale mutually or not or the electric power of repelling each other.Except that current collector, each switch also has fixed contact.According to definition, current collector can move with respect to fixed contact when switch opens or closes.
Load being arranged, coming in contact during particularly in short circuit when separating, can between the contact component that disconnects, can produce electric arc in the moment that contact disconnects.Therefore, form, when contact disconnects, the power of inhaling mutually between two contacts is made us expecting in order to postpone electric arc.On the other hand, the electric power of repelling each other also is useful, and it helps the contact to disconnect and impels electric arc to eliminate.Therefore, up to now, such contact system is only disclosed, according to the difference of configuration, that inhale, that do not have, repel each other the mutually electric power of effect on current collector.A kind ofly have corresponding contact spring power and electric power is had the contact alloy material of certain standard by merging, scaling loss, welding inclination angle and dissipation power are kept within the acceptable range.
Patent documentation DE 1062327A1 discloses a kind of switching device, for example is used for having power supply, the voltage divider arrangement that can select circuit breaker for short circuit current intensity.Wherein a kind of contact structure can produce the electric power of repulsion on current collector when fast shut-off.In addition, another kind of contact structure can produce on current collector and inhale electric power mutually when postpone cut-out.
In addition, patent documentation DE 1085946A1 has described a kind of Electical connector that is used for high current.In contact component, be provided with slit.Electric current in the contact has substantially the same direction, and by opening circuit to come this slit of cross-over connection before opening, can occur the sense of current that can not produce thrust like this.
Summary of the invention
The objective of the invention is to propose a kind of contact device that is used for high current, it can improve scaling loss, welding inclination angle and dissipation power.
According to the present invention, this purpose realizes thus, be that contact device is provided with first contact with first conducting line segment, and second contact, it has second parallel with the first conducting line segment basically conducting line segment, a privates section and a segmental arc, wherein, second conducting line segment has first and second ends, wherein, segmental arc couples together first end and the privates section of second conducting line segment, and wherein, the privates section is passed in the privates section, wherein, second conducting line segment has first make contact in the zone of its second end, the privates section has second contact point, wherein, first contact contacts first and second contact points or only contacts second contact point in primary importance, and first contact only contacts first make contact at second place place.Once more, first and second positions do not have the stipulated time order when opening or close, more be residing position.
The disconnection of contact device and closure can realize by multiple running status or position contacting in an advantageous manner.Under each running status, can calculate its electric power according to priority target.Utilize privates section (the given electric current of at least a portion flow through respectively first and/or the second place) just can realize that i.e. change by position contacting changes current path, wherein, two contacts still link together.Second conducting line segment and privates section can be located to interconnect endways.Thus, two current paths all can have current branch, and these current branch can use separately or concurrently under different running statuses.Simultaneously, the privates section can be parallel to first and second conducting line segments; Similarly, the privates section also can be 90 ° with first and second conducting line segments and be arranged on the segmental arc place, and the privates section just can be connected with the privates section obliquely like this.
First conducting line segment can only only be connected with the privates section with second conducting line segment and at second place place at the primary importance place, perhaps both also is connected with the privates section with second conducting line segment.Alternatively, first conducting line segment both also was connected with the privates section with second conducting line segment at the primary importance place, was connected at second place place or with second conducting line segment, perhaps was connected with the privates section.Another possibility is that first conducting line segment only is connected with the privates section at the primary importance place, only is connected with second conducting line segment at second place place, perhaps both has been connected also with second conducting line segment to be connected with the privates section.Under any circumstance, all can change with respect to the primary importance place at second place place to the electric power of two contact generation effects, this is because use different current paths under different running statuses.When second conducting line segment is parallel to first conducting line segment through long as far as possible one section circuit and with shortest spacing, the electric power maximum of generation.But the depth of parallelism also deviation may occur, and wherein, the electric power of generation can correspondingly reduce.When the electric power that produces correspondingly reduced, second conducting line segment was a bigger angle with respect to first conducting line segment on spatial placement, such as 45 °, also be possible.Second conducting line segment is with angle can adjust by the ratio of definition power with respect to the layout of first conducting line segment of definition.
In preferred design, the privates section is parallel with first conducting line segment basically, thereby makes being passed in the privates section that the privates section can be vertical.Can realize a compact structure thus.
According to a particularly preferred embodiment, first contact when contact device disconnects from primary importance roll or translational motion to the second place.This rolling movement can realize, promptly in different running statuses application examples as the different contact position of second contact.
Two contacts can be inhaled by electric power mutually at the primary importance place.According to optional embodiment, two contacts also can repel each other by electric power at the primary importance place.Like this, not only by elastic force, also can be by the current affects contact power that flows.
According to another design of contact device, but two contacts apply the power of an equidirectional varying strength mutually with respect to the second place at the primary importance place.That is to say that two contacts can be for example weak than repelling each other in the second place in primary importance.This is favourable for temporal arc process.
According to the present invention, above-mentioned purpose also can realize by a contact device, this contact device has first and second contacts, first contact has first conducting line segment, this first conducting line segment is passed in the contact-segment, second contact has second conducting line segment, itself and first conducting line segment are substantially parallel and be connected to first make contact, and wherein, two contacts are electrically connected mutually in first and second position, electricity separates each other in the 3rd position, wherein, second contact has the privates section, and this privates Duan Zaiyi side is connected with second conducting line segment, and be passed in the second place at opposite side, and first and second contacts only connect as follows:
-primary importance place, contact-segment only is connected with parts in following group: first make contact, second contact point and first and second contact points,
-at second place place, only be connected with another parts in above-mentioned group.
For in the process of disconnection and closure, that is to say in first and second position to change electric power that three contact points all are very important (contact-segment is as the 3rd contact point) in an advantageous manner.
Description of drawings
With reference now to accompanying drawing, further the present invention is described in detail, shown in the figure:
Fig. 1 is the contact device according to first embodiment under first kind of running status;
Fig. 2 is the contact device of the Fig. 1 under second kind of running status;
Fig. 3 is the contact device according to second embodiment;
Fig. 4 is according to the contact device of the 3rd embodiment;
Fig. 5 is the partial view of the contact device among Fig. 4 under first kind of running status;
Fig. 6 is the partial view of the contact device among Fig. 4 under second kind of running status.
Embodiment
Next the embodiment that further illustrates shows the preferred embodiments of the present invention.
Line protection switch or circuit breaker can design has contact system or contact device, as its as shown in Fig. 1 among first embodiment.Contact system is made up of current collector 1 and fixed contact 2.Current collector 1 first contact of expression also has segment length's shape conducting line segment 3.It is passed in the arc contact-segment 4.
Fixed contact 2 expression second contacts also have second conducting line segment 6, and this second conducting line segment has the first terminal 6-1 and the second terminal 6-2, wherein, is provided with first make contact 5 in the zone of the second terminal 6-2.Shown in running status under (normal operating condition, i.e. on-state), second conducting line segment 6 is parallel to first conducting line segment of current collector.Insert segmental arc 7 at its first terminal 6-1 place, second conducting line segment 6, connect one section straight conducting line segment 8 then, this straight conducting line segment for example is parallel to second conducting line segment 6 and first conducting line segment 3.Straight conducting line segment 8 is passed in the privates section 9, and it is substantially perpendicular to conducting line segment 3,6 and 8.Privates section 9 has contact point 10 at its end, and itself and contact point 5 are adjacent to be provided with.Use two contact points 5,10 that electricity is in parallel at this, these two electrical pickofves are at specific resistance and resist on the burning property can be identical, also can be different.Because two contact points 5 are connected with different conducting line segment with 10, depend on flow through in contact point 5 and 10 which of electric current I so act on electric power on the current collector 1.
Under normal operating condition, the current collector 1 that has a contact-segment 4 and second contact point 10 of fixed contact 2 be connected.Then, the electric current I of the supply by the current collector or first conducting line segment 3 flows in the privates section 9 of fixed contacts 2 by second contact point 10.Because electric current flows into privates section 9 with the right angle in first conducting line segment, so do not have electrodynamic action on current collector 1.
In addition, under normal operating condition, the first make contact 5 among Fig. 1 is connected with current collector 1.According to the situation of specific electrical resistance, the minimum part of electric current I can flow into privates section 9 (with reference to the current trends of figure 2) by the first make contact 5 and second conducting line segment 6.In this case, under normal operating condition, can produce the minimum electric power F that repels each other equally
b
If cut-off switch, second contact point 10 of fixed contact 2 will separate with current collector 1 so, and current collector 1 forms with first make contact 5 or keeps being connected.Thus, electric current I (whole) will be through the first make contact 5 or second conducting line segment 6.Because electric current (first conducting line segment 3 and second conducting line segment 6) in two parallel conductive line segments flows through in the opposite direction, therefore two leads repel each other.Produce an electric power F who repels each other thus
BThis power helps further break contact, and this power imports by the rolling-operation of current collector 1.
According to first embodiment shown in Fig. 1 and Fig. 2, under normal operating condition, there is not additional electrodynamic action to current collector 1, but when current collector rolls, in order to disconnect contact system, current path changes, and promptly current collector 1 repels each other with fixed contact 2.But,, under normal operating condition, during the contact cut-off/close, can also realize the ratio of other power according to the present invention.The present invention relates generally to all general layouts, another current path as long as electric current is flowed through when the contact cut-off/close, the ratio that acts on the power on the current collector will change.Fig. 3,4 to 6 has showed other examples.
According to second kind of embodiment of Fig. 3, the current collector 1 that has first conducting line segment 3 and a conducting line segment 4 changes with not comparing at aforesaid embodiment.Yet in the embodiment of Fig. 1 and Fig. 2, fixed contact 2 has the contact arm 5,6,7,8 of U-shaped, has O shape contact arm in Fig. 3, promptly back- shaped contact arm 10,11,12,13,14.Their form one complete back-shaped, by 10 beginnings of second contact point, by conducting line segment 11 perpendicular to first conducting line segment 3, the conducting line segment 12 that for example is parallel to conducting line segment 3, segmental arc 13 and straight conducting line segment 14 (this straight conducting line segment utilizes its first terminal 14-1 to be connected with segmental arc 13) are arranged between two conducting line segments 3 and 12 and are parallel to first conducting line segment 3, process is (with reference to the plane among the figure 3 above conducting line segment 11, conducting line segment 11 and 12 is arranged in this plane), and be passed in the conducting line segment 15 parallel with conducting line segment 11 at its second terminal 14-2 place.Be provided with first make contact 5 at the second terminal 14-2 of conducting line segment 14 or in it is passed into the zone of conducting line segment 15.Conducting line segment 14 has the function of second conducting line segment 6 (Fig. 1), because it more approaches first conducting line segment 3 than conducting line segment 12.Just in this point, it is very important for the power that acts between current collector 1 and the fixed contact 2.Aspect the transmission of electric current I, conducting line segment 15 has the function of the privates section 9 among Fig. 1 and Fig. 2.In its first end, it is connected with contact point 5.In normal operating condition, that is to say that current collector 1 is in the position of describing among Fig. 3, contact point 5 is connected with the conducting line segment 4 of current collector 1 as second contact point 10.When current collector 1 rolled, at least, it can be as being connected with conducting line segment 4 shown in Fig. 1.
If under normal operating condition, two contact points 5 all are connected with conducting line segment 4 with 10, so just have minimum one part of current by contact arm 10,11,12,13 and 14, and the power of inhaling mutually between current collector 1 and fixed contact 2 will weaken.
Otherwise,, have only second contact point 10 to be connected with conducting line segment 4 if under normal operating condition, electric current will look like shown in Fig. 3, first conducting line segment, 3, the second contact points 10 of the current collector 1 of flowing through, conducting line segment 11 and 12, segmental arc 13 and conducting line segment 14 arrive conducting line segment 15.In the first and second section lead sections, that is to say conducting line segment 3 and 14, electric current is parallel and direction is identical.Therefore these two conducting line segments 3 are inhaled mutually with 14, produce the power F that inhales mutually
nWhen current collector 1 was rolled to position shown in Figure 2, electric current directly flow into the conducting line segment 15 of fixed contact 2 from first conducting line segment 3 of current collector 1.In this case, there is not electrodynamic action on current collector 1.
Another kind of situation, electric power changes when current collector 1 rolls, and the mutual expelling force when the phase suction under normal operating condition contacts with disconnection mixes mutually.This variant is shown in Fig. 4 to Fig. 6, and corresponds essentially to the combination of two embodiment among Fig. 1 and Fig. 3.The current collector 1 that has first conducting line segment 3 and conducting line segment 4 remains unchanged.Under normal operating condition, just electric current is through the situation of second contact point 10, and fixed contact 2 comprises O shape contact arm 10,11,12,13,14, and they are passed in the conducting line segment 15, with conduction current.Conducting line segment has the identical functions with embodiment described in Fig. 3.In addition, the fixed contact 2 among Fig. 4 embodiment has a U-shaped contact arm 5,6,7,8, and it is passed in the conducting line segment 15 equally.When for disconnection during rolling current collector 1, this second contact arm is connected with current collector 1.
Figure 5 illustrates the part of fixed contact 2, just the state that under normal operating condition, links together of O shape contact arm with current collector 1.Electric current I flows through as among Fig. 3, produces a power F who inhales mutually on current collector 1
N
According to shown in Figure 6, when current collector 1 rolled, conducting line segment 4 separated with second contact point 10 and contacts with first make contact 5.Therefore, shown in Fig. 6 is U-shaped contact arm 5,6,7,8 basically, and O shape contact arm only dots in the back.Under the running status that current collector 1 rolls, the flow direction of electric current I basically with Fig. 2 in identical, just through first conducting line segment 3 and U-shaped contact arm 5,6,7,8, flow into conducting line segment 15.Because the nonparallel electric current in the conducting line segment 3 and 6 can produce a power F who repels each other once more on current collector 1
n
Under normal operating condition (comparison diagram 5), current collector 1 also can be attracted.The power of Xiing is big more mutually, and the contact contact resistance is more little, and loss power and heat release are more little.When disconnecting current collector and electric current through contact point 5, the power of lifting that acts on the current collector 1 can make contact disconnect and elimination electric arc.Therefore can further reduce the contact scaling loss, and under load, connect the quantity of more circuit or minimizing contact material.
In addition, contact system constitutes like this, and the phase suction a little less than promptly can realizing one under normal operating condition produces a strong mutual expelling force when disconnecting contact.If this is the case, when the running status of as illustrated in fig. 1 and 2 embodiment, conducting line segment two contact points 5 of 4 contacts and 10, and when disconnecting, only connect with contact point 5.But a variant of mutual expelling force also can by different size and/or realize apart from two U-shaped contact arms of 1 different distance of current collector.
When inserting load, also can regulate corresponding electric power.At this, with the order of putting upside down, at first closed first make contact 5 is second contact point 10 then.Like this, setting that can be best goes out to be used to connect the electrodynamic size of process.
In the accompanying drawings, privates section 8 and 12 is parallel to second conducting line segment 6 and 14 all the time.Yet this is dispensable; Privates section 8 and 12 also can be with respect to second conducting line segment 6 and 14, remove with the angle of a maximum to 90 °, and are passed in privates section 9 and 11.Like this, privates section 8 and 12 pairs of influences that act on the power between first conducting line segment 3 and second conducting line segment 6 and 14 are just further reduced.But therefore the required structure space of contact device can increase.
Reference number
1 current collector
2 fixed contacts
3、6、8、9、11、
12,13,14,15 conducting line segments
4 contact-segments
5,10 contact points
7 segmental arcs
6-1 first end
6-2 second end
F
b, F
nPower
The I electric current
Claims (6)
1. contact device has:
-the first contact (1), described first contact have first conducting line segment (3) and
-the second contact (2), described second contact have second conducting line segment (6,14) substantially parallel with described first conducting line segment (3), privates section (8,12) and segmental arc (7,13), wherein
-described second conducting line segment (6,14) have first end (6-1,14-1) and second end (6-2,14-2),
Described first end of-described segmental arc (7,13) and described second conducting line segment (6,14) (6-1,14-1) and described privates section (8,12) connect,
-described privates section (8,12) is passed in the privates section (9,11),
(6-2 has first make contact (5) to-described second conducting line segment (6,14) in zone 14-2) at its described second end
-described privates section (9,11) has second contact point (10)
-described first contact (1) contacts with second contact point (10) with described first make contact (5) in primary importance, perhaps only contacts with described second contact point (10), and
-described first contact (1) only contacts with described first make contact (5) at second place place.
2. contact device according to claim 1, wherein, described privates section (8,12) is parallel with described first conducting line segment (3) basically, and vertically is passed in the described privates section (9,11).
3. contact device according to claim 1, wherein, when described contact device disconnected, described first contact (1) was made rolling movement or the translational motion from described primary importance to the described second place.
4. according to each described contact device in the aforementioned claim, wherein, described two contacts (1,2) pass through electric power F in primary importance
nFurther.
5. contact device according to claim 1 and 2, wherein, described two contacts (1,2) pass through electric power F in described primary importance
bPush open.
6. according to each described contact device in the aforementioned claim, described two contacts (1,2) are applied with a direction mutually with respect to the described second place at described primary importance place identical, but the different power of intensity.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007048971 | 2007-10-12 | ||
| DE102007048971.6 | 2007-10-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101409159A true CN101409159A (en) | 2009-04-15 |
Family
ID=40459162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101618985A Pending CN101409159A (en) | 2007-10-12 | 2008-10-13 | Contact device with different contact forces in different operating states |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101409159A (en) |
| DE (1) | DE102008049789B4 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102610454A (en) * | 2012-03-08 | 2012-07-25 | 江苏辉能电气有限公司 | Upper inlet stationary contact device of molded case circuit breaker |
| CN103026440A (en) * | 2010-03-10 | 2013-04-03 | Ge能源能量变换技术有限公司 | Rotary switches |
| CN108231441A (en) * | 2018-03-12 | 2018-06-29 | 西安开天铁路电气股份有限公司 | A kind of structure of contact terminal |
| CN111354585A (en) * | 2020-05-14 | 2020-06-30 | 广东电网有限责任公司东莞供电局 | Dual-power switching device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2458613A1 (en) | 2010-11-29 | 2012-05-30 | Eaton Industries GmbH | Contact device of an electric switching device |
| DE102013216018B4 (en) | 2013-08-13 | 2021-06-02 | Siemens Aktiengesellschaft | Device for transmitting forces |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1085946B (en) * | 1957-08-29 | 1960-07-28 | Bbc Brown Boveri & Cie | Electrical contact arrangement for high currents |
| DE1062327B (en) * | 1958-10-28 | 1959-07-30 | Licentia Gmbh | Switching device z. B. for power supply or distribution systems with selectively responsive circuit breakers for short-circuit currents |
-
2008
- 2008-09-30 DE DE102008049789.4A patent/DE102008049789B4/en not_active Expired - Fee Related
- 2008-10-13 CN CNA2008101618985A patent/CN101409159A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103026440A (en) * | 2010-03-10 | 2013-04-03 | Ge能源能量变换技术有限公司 | Rotary switches |
| CN102610454A (en) * | 2012-03-08 | 2012-07-25 | 江苏辉能电气有限公司 | Upper inlet stationary contact device of molded case circuit breaker |
| CN102610454B (en) * | 2012-03-08 | 2014-07-02 | 江苏辉能电气有限公司 | Upper inlet stationary contact device of molded case circuit breaker |
| CN108231441A (en) * | 2018-03-12 | 2018-06-29 | 西安开天铁路电气股份有限公司 | A kind of structure of contact terminal |
| CN108231441B (en) * | 2018-03-12 | 2024-02-20 | 西安开天铁路电气股份有限公司 | Contact structure |
| CN111354585A (en) * | 2020-05-14 | 2020-06-30 | 广东电网有限责任公司东莞供电局 | Dual-power switching device |
| CN111354585B (en) * | 2020-05-14 | 2020-08-21 | 广东电网有限责任公司东莞供电局 | Dual-power switching device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102008049789B4 (en) | 2016-10-20 |
| DE102008049789A1 (en) | 2009-04-23 |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20090415 |