CN1298004C - Large capacity short-circuit current drop-out device - Google Patents
Large capacity short-circuit current drop-out device Download PDFInfo
- Publication number
- CN1298004C CN1298004C CNB2004100259991A CN200410025999A CN1298004C CN 1298004 C CN1298004 C CN 1298004C CN B2004100259991 A CNB2004100259991 A CN B2004100259991A CN 200410025999 A CN200410025999 A CN 200410025999A CN 1298004 C CN1298004 C CN 1298004C
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- CN
- China
- Prior art keywords
- fuse
- current
- current limiting
- short circuit
- circuit current
- Prior art date
- 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.)
- Expired - Fee Related
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Abstract
The present invention relates to a large-capacity short circuit current breaking device, which comprises a vacuum fuse and a current limiting fuse mutually connected in series, wherein the current limiting fuse comprises electric conduction blocks connected in series and arranged in an insulating sleeve, and a strip-shaped annular fused mass is respectively arranged between two adjacent electric conduction blocks. Because the vacuum fuse and the current limiting fuse in the present invention are connected in series, the vacuum fuse is used to complete the breaking of low overload current, and the current limiting fuse is used to complete the breaking of large overload current and short circuit current; the current limiting breaking of short circuit current is completed by utilizing the inherent current limiting characteristic of the current limiting fuse, and the reignition of the short circuit current after breaking forcedly is controlled by the vacuum fuse. In addition, the strip-shaped annular fused mass is respectively arranged between two adjacent electric conduction blocks of the current limiting fuse in the present invention, the power consumption of the present invention under normal operation condition can be reduced greatly, and the short circuit current can be broken rapidly and reliably without needing any control element to judge the character of the short circuit current.
Description
Technical field
The invention belongs to technical field of electricity, particularly a kind of big capacity short circuit current cut-off device.
Background technology
In electric power system; the short circuit current of 12KV～40.5KV is cut-off extensive employing primary cut-out to be finished; but primary cut-out does not have metering function; therefore; in the distribution system of this electric pressure scope, apply current limiting fuse gradually and substitute primary cut-out, guarantee not make power equipment such as protected transformer in cut-offfing the short circuit current process, to cause damage because of excessive short circuit current.But increase along with the fuse rated current, power loss increases along with the increase of rated current, therefore under normal condition of work, the power consumption cost that annual power consumption is paid is too big, restriction is used in the above occasion of rated current 500A, currently during greater than 1000A, select for use a kind of hybrid fuse (being called explosion fuse again) can reduce power consumption greatly to rated current both at home and abroad, but its complex structure, cost an arm and a leg.
Summary of the invention
The object of the present invention is to provide a kind of without any need for control element, simple in structure, reliability height, low cost of manufacture, efficient height, big capacity short circuit current cut-off device low in energy consumption.
For achieving the above object, the technical solution used in the present invention is: comprise vacuum fuse and current limiting fuse, be characterized in, vacuum fuse and current limiting fuse coupled in series, current limiting fuse comprises the conducting block that is arranged on the coupled in series in the insulating case, between two adjacent conducting blocks, be respectively arranged with the annular melt of strip, and around annular melt, also be filled with quartz sand.
Another characteristics of the present invention are: the annular melt of strip is silver-colored melt; The outside of current limiting fuse also is provided with the fin with quantity such as conducting blocks.
Because the present invention is connected in series vacuum fuse and current limiting fuse, finish cut-offfing of low overload current with vacuum fuse, finish cut-offfing of big overload current and short circuit current with current limiting fuse, the current limliting of utilizing the intrinsic current limiting characteristic of current limiting fuse to finish short circuit current is cut-off, and controls restriking of short circuit current after being forced to cut-off by vacuum fuse.The present invention is respectively arranged with the annular melt of strip between adjacent two conducting blocks of current limiting fuse in addition, its power consumption is in normal working conditions reduced significantly and judge the character of short circuit current, can reliably cut-off short circuit current rapidly without any need for control element.
Description of drawings
Accompanying drawing is an overall structure schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and operation principle are described in further detail.
The present invention includes the vacuum fuse 1 and the current limiting fuse 2 of mutual series connection, current limiting fuse 2 comprises the conducting block that is connected in series 5 that is arranged in the insulating case 3, between two adjacent conducting blocks 5, be respectively arranged with the annular silver-colored melt 6 of strip, also be filled with quartz sand around annular melt 6, the outside of current limiting fuse 2 also is provided with the fin 4 with quantity such as conducting block.
Operation principle of the present invention is as follows: when the end cap A of vacuum fuse 1 inserts power input, after the end cap B of current limiting fuse 2 inserts power output end, when passing through if any short circuit current, the annular silver-colored melt 6 instantaneous electric arcs that produce simultaneously of the strip of the mutual series connection in melt in the vacuum fuse 1 and the current limiting fuse 2, at this moment the annular silver-colored melt 6 of strip around the forcing under the cooling blow-out effect of quartz sand, current limliting cut-off short-circuit current and vacuum fuse 1 because short-circuit current is cut-off by current limiting fuse 2, the melt that makes vacuum fuse 1 is forced to blow-out and disconnects and stoped restriking of whole cut-off device.
The present invention is under normal circumstances low in energy consumption, power consumption during operation only is 300～1000W, and be provided with radiator, the hybrid fuse of temperature rise ratio will low and not need the equipment such as transducer, controller and igniter of special indication short circuit current character, has to produce advantages such as misoperation, reliable operation, consumed power be low.
Claims (3)
1, big capacity short circuit current cut-off device, comprise vacuum fuse [1] and current limiting fuse [2], it is characterized in that: vacuum fuse [1] and current limiting fuse [2] coupled in series, said current limiting fuse [2] comprises the conducting block [5] that is arranged on the coupled in series in the insulating case [3], between adjacent two conducting blocks [5], be respectively arranged with the annular melt [6] of strip, and around annular melt [6], also be filled with quartz sand.
2, big capacity short circuit current cut-off device according to claim 1, it is characterized in that: the annular melt [6] of said strip is silver-colored melt.
3, big capacity short circuit current cut-off device according to claim 1 is characterized in that: the outside of said current limiting fuse [2] also is provided with the fin [4] with quantity such as conducting blocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100259991A CN1298004C (en) | 2004-03-26 | 2004-03-26 | Large capacity short-circuit current drop-out device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100259991A CN1298004C (en) | 2004-03-26 | 2004-03-26 | Large capacity short-circuit current drop-out device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1564293A CN1564293A (en) | 2005-01-12 |
| CN1298004C true CN1298004C (en) | 2007-01-31 |
Family
ID=34480529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100259991A Expired - Fee Related CN1298004C (en) | 2004-03-26 | 2004-03-26 | Large capacity short-circuit current drop-out device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1298004C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100394524C (en) * | 2005-12-09 | 2008-06-11 | 王季梅 | Breaker of large-capacity vacuum short-cut current |
| CN102779692A (en) * | 2012-07-31 | 2012-11-14 | 人民电器集团有限公司 | Melt formed by folding processing method and melt body using same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0660351A2 (en) * | 1993-12-27 | 1995-06-28 | Cooper Industries Inc. | Improved current limiting fuse and dropout fuseholder |
| US5583729A (en) * | 1992-09-17 | 1996-12-10 | Cooper Industries, Inc. | Terminal bushing having integral overvoltage and overcurrent protection |
| CN1377508A (en) * | 1999-08-18 | 2002-10-30 | 安大略电力股份有限公司 | Non-venting cutout mounted fuse |
-
2004
- 2004-03-26 CN CNB2004100259991A patent/CN1298004C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5583729A (en) * | 1992-09-17 | 1996-12-10 | Cooper Industries, Inc. | Terminal bushing having integral overvoltage and overcurrent protection |
| EP0660351A2 (en) * | 1993-12-27 | 1995-06-28 | Cooper Industries Inc. | Improved current limiting fuse and dropout fuseholder |
| CN1377508A (en) * | 1999-08-18 | 2002-10-30 | 安大略电力股份有限公司 | Non-venting cutout mounted fuse |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1564293A (en) | 2005-01-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070131 Termination date: 20100326 |