CN202353174U - Combined protector of high-voltage current limiting fuse - Google Patents
Combined protector of high-voltage current limiting fuse Download PDFInfo
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- CN202353174U CN202353174U CN2011204540621U CN201120454062U CN202353174U CN 202353174 U CN202353174 U CN 202353174U CN 2011204540621 U CN2011204540621 U CN 2011204540621U CN 201120454062 U CN201120454062 U CN 201120454062U CN 202353174 U CN202353174 U CN 202353174U
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Abstract
The utility model relates to a combined protector of a high-voltage current limiting fuse. The combined protector comprises a high-voltage isolating switch, a vacuum circuit breaker, a zinc oxide non-linear element which is electrically connected between the high-voltage isolating switch and the vacuum circuit breaker in series, and the high-voltage current limiting fuse which is connected with the zinc oxide non-linear element in parallel. The combined protector of the high-voltage current limiting fuse is suitable for circuits and house transformers with high short-circuit capacity as well as loops of excitation transformers in a 3-35kV electric power system, and when the system is short-circuited, the short-circuit current can be cut off within 1-2 milliseconds.
Description
Technical field
The utility model relates to a kind of protective device, relates in particular to a kind of high-voltage and current-limitation fuse assembled protector.
Background technology
Along with the fast development of China's distribution network, the capacity of short circuit of electric power system increases day by day, and the excitation of generator outlet end becomes, unit transformer, and short circuit current is very big, and the past, conventional way was: the mode of cut-offfing that adopts circuit breaker series connection current limiting reactor.When electrical network during in normal operation, there are voltage landing and loss, very big to the transmission of electricity quality influence of electrical network.Reactor can only change the peak value of short circuit current and can not change time of short circuit current zero crossing, and circuit breaker will just can cut-off short circuit current in several again cycles, and the peak value of short circuit current causes cumulative bad to destroy repeatedly through short-circuit network to system.Special city's generator outlet short circuit; Short circuit current will pass through the time that reaches 20ms ~ 150ms could zero crossing, makes circuit breaker cut-off difficulty, and switch off time is long; To generator; Transformer and cable produce very big electric power and thermal effect effect, produce very big repulsion electric power on the switch contact, make contact that burnout failure often take place.
The utility model content
In order to address the above problem; Be necessary to provide a kind of high-voltage and current-limitation fuse assembled protector; This device is applicable to circuit and the station transformer that has big capacity of short circuit in 3 ~ 35KV electric power system; Short circuit current when system is short-circuited, can be cut-off in the loop of excitation transformer within 1 ~ 2ms.
The utility model is to realize like this; A kind of high-voltage and current-limitation fuse assembled protector, it comprise high voltage isolator, vacuum circuit-breaker, electrically be serially connected in zinc oxide nonlinear element between said high voltage isolator and the said vacuum circuit-breaker, be connected in parallel on the high-voltage and current-limitation fuse on the said zinc oxide nonlinear element.
The beneficial effect of the high-voltage and current-limitation fuse assembled protector of the utility model is: when short circuit occurring, current limiting fuse is quick fuse in 1 ~ 2ms, cutting-off of short-circuit electric current; Current limiting fuse dams and produces the electric arc pressure; Force arc current to be transferred in the high energy ZnO resistors, it is the zinc oxide nonlinear element, and thermal capacity is big; Logical good fluidity plays the effect of extinguishing fuse electric arc fast; When fuse when a certain short circuit at first fuses mutually, all the other two phase fuses are fusing also, the short circuit current of this moment is if surpass the connecting-disconnecting function of vacuum switch, three-phase current is cut-off by fuse.When the high-voltage and current-limitation fuse assembled protector cooperates vacuum circuit-breaker to use, cut-off rated current and general overload current by vacuum circuit-breaker.During the combination of high-voltage and current-limitation fuse assembled protector and on-load switch, high-voltage and current-limitation fuse itself with striker direct action on-load switch, make its tripping operation, avoid phase-deficient operation.During the combination of high-voltage and current-limitation fuse assembled protector and circuit breaker, high-voltage and current-limitation fuse with the sensitive switch contact send the interlock instruction to circuit breaker.High energy ZnO resistors is transferred to self with the Sino-German arc current of fuse and is also absorbed magnetic energy, the conducting arc voltage, and overvoltage Limiting is in apparatus insulated allowed band when cut-offfing.
Description of drawings
The circuit theory diagrams of the high-voltage and current-limitation fuse assembled protector that Fig. 1 provides for the utility model preferred embodiments.
Fig. 2 is the current characteristics curve of Fig. 1 mesohigh current limiting fuse assembled protector.
Fig. 3 is the application sketch map of Fig. 1 mesohigh current limiting fuse assembled protector.
Fig. 4 is that the another kind of Fig. 1 mesohigh current limiting fuse assembled protector is used sketch map.
Symbol description
| High voltage isolator | GL |
| Vacuum circuit-breaker | DL |
| The zinc oxide nonlinear element | FR |
| High-voltage and current-limitation fuse | FU |
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also Fig. 1, the circuit theory diagrams of the high-voltage and current-limitation fuse assembled protector (MEFU) that it provides for the utility model preferred embodiments, it is mainly used in the direct branch road of generator outlet end, like loops such as excitation change, unit transformer, isolation changes; Also can be used for circuit, transformer that 3 ~ 35kV electric power system has big capacity of short circuit, fast and reliable is cut-off big short circuit current
The high-voltage and current-limitation fuse assembled protector comprise high voltage isolator GL, vacuum circuit-breaker DL, electrically be serially connected in zinc oxide nonlinear element FR between high voltage isolator GL and the vacuum circuit-breaker DL, be connected in parallel on the high-voltage and current-limitation fuse FU on the zinc oxide nonlinear element FR.
This assembled protector is by special high-voltage and current-limitation fuse parallel connection high energy ZnO resistors and cooperate vacuum switch to combine.Install as shown in Figure 1.When short circuit occurring, current limiting fuse is quick fuse in 1 ~ 2ms, cutting-off of short-circuit electric current; Current limiting fuse dams and produces the electric arc pressure; Force arc current to be transferred among the high energy ZnO resistors FR, FR is the zinc oxide nonlinear element, and thermal capacity is big; Logical good fluidity plays the effect of extinguishing fuse electric arc fast.When fuse when a certain short circuit at first fuses mutually, all the other two phase fuses are fusing also, the short circuit current of this moment is if surpass the connecting-disconnecting function of vacuum switch, three-phase current is cut-off by fuse.When this device cooperates vacuum circuit-breaker to use, cut-off rated current and general overload current by vacuum circuit-breaker.
The high-voltage and current-limitation fuse assembled protector adopts high-voltage and current-limitation fuse parallel connection high energy ZnO nonlinear resistance, the assembled scheme of series vacuum switch again; Two kinds of functional separations of control and protection; When big short circuit current takes place, excised by high-voltage and current-limitation fuse, normal and general overload current is excised by vacuum switch.This device has following characteristics.
Rapidity: this device can dam in the 2ms before short circuit current rises to peak value fast, excision fault in 3 ~ 4ms, and the three-phase current duration is no more than 6ms (like Fig. 2).
Current limliting property: this device is controlled at below 15% of prospective short circuit current peak value to the cut-off current peak value, has improved the moving stability margin of system and power equipment greatly.Reduce the equipment investment expense, prolonged service life of equipment.
Reliability: by its physical characteristic decision, do not have tripping and malfunction phenomenon during the fusing of this device, improved the security reliability of equipment greatly.
Breaking capacity is strong: this installs maximum drop-out current can reach 63kA ~ 160kA.
The energy-absorbing capacity is big: it is big that big capacity height cut-offs fuse energy-absorbing capacity; When the MEFU device cut-offs short circuit current; Most of energy that system short-circuit produces is absorbed by the special quartz sand in the fuse; The energy-absorbing capacity of this quartz sand is 2KJ/g, and its proportion is 1.5g/cm3, and the energy-absorbing capacity of unit volume quartz sand is 3KJ/cm3.The ability capacity that uses that the ZnO resistors parallelly connected with fuse is every be 10KJ, and the weight of every ZnO resistors is 300g, and its proportion is 5.5g/cm3, and the energy-absorbing capacity of unit volume ZnO resistors is 183.3J/cm3.
See also Fig. 3, it is used for the sketch map of station transformer branch for the high-voltage and current-limitation fuse assembled protector.When being short-circuited near the station transformer bushing, because short circuit current can can't be chosen suitable circuit breaker up to kilo-amperes up to a hundred.For the hydroelectric plant, in case be short-circuited, short circuit current will be up to thousands of times of station transformer rated current, and this will make station transformer suffer badly damaged even blast.
After the station transformer high-pressure side installed the high-voltage and current-limitation fuse assembled protector additional, can bring following benefit: station transformer was effectively protected, and avoided because of the internal fault accident of blasting; In case the short circuit of station-service branch, the quick acting of high-voltage and current-limitation fuse assembled protector makes maximum short-circuit impact electric current reduce by 3-6 times, can avoid main transformer to be damaged because of winding deformation; High-voltage and current-limitation fuse assembled protector 100 is excision station-service branch fault fast, can avoid generator repeatedly to suffer the impact of powerful short circuit current for a long time.
See also Fig. 4, it is used for the sketch map of excitation transformer branch for the high-voltage and current-limitation fuse assembled protector.During the excitation transformer internal fault, short circuit current will reach more than 1,000 times of rated current, and as leaning on eliminating magnetism of generator excision fault, the short circuit current longer duration will cause the badly damaged of excitation transformer even blast inevitably.And excitation because excision is long fault time, will enlarge the device damage degree when becoming low-pressure side rectifier bridge fault, prolongs unit repair time greatly.
After the excitation transformer high-pressure side installs the high-voltage and current-limitation fuse assembled protector additional, can bring following benefit: protect excitation transformer effectively, avoid because of the internal fault accident of blasting; During excitation transformer branch short circuit, can excise fault fast, make maximum short-circuit impact electric current reduce by 3-6 times, avoid the transformer coil distortion and damage by the high-voltage and current-limitation fuse assembled protector; The rectifier bridge fault can be excised fault fast at 20-40ms, reduces causality loss, shortens the accidental shutdown time; The generator that can avoid the excitation transformer fault to cause repeatedly suffers the impact of big electric current for a long time.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (1)
1. high-voltage and current-limitation fuse assembled protector; It is characterized in that, it comprise high voltage isolator, vacuum circuit-breaker, electrically be serially connected in zinc oxide nonlinear element between said high voltage isolator and the said vacuum circuit-breaker, be connected in parallel on the high-voltage and current-limitation fuse on the said zinc oxide nonlinear element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204540621U CN202353174U (en) | 2011-11-16 | 2011-11-16 | Combined protector of high-voltage current limiting fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204540621U CN202353174U (en) | 2011-11-16 | 2011-11-16 | Combined protector of high-voltage current limiting fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202353174U true CN202353174U (en) | 2012-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204540621U Expired - Fee Related CN202353174U (en) | 2011-11-16 | 2011-11-16 | Combined protector of high-voltage current limiting fuse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202353174U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743057A (en) * | 2016-04-22 | 2016-07-06 | 平玉兰 | High-voltage current-limiting protection apparatus for key water-control project |
| CN106849022A (en) * | 2017-03-02 | 2017-06-13 | 安徽伊格瑞德电气设备有限公司 | A kind of busbar voltage holding meanss based on current limliting zinc oxide FR |
| CN106849030A (en) * | 2017-03-02 | 2017-06-13 | 安徽伊格瑞德电气设备有限公司 | A kind of high-voltage and current-limitation device based on current limliting zinc oxide FR |
| CN106936118A (en) * | 2017-04-16 | 2017-07-07 | 安徽徽电科技股份有限公司 | A kind of HDF Large Copacities busbar voltage holding meanss |
| CN107465141A (en) * | 2016-06-03 | 2017-12-12 | 有能集团江苏电气有限公司 | A kind of vacuum circuit breaker |
-
2011
- 2011-11-16 CN CN2011204540621U patent/CN202353174U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743057A (en) * | 2016-04-22 | 2016-07-06 | 平玉兰 | High-voltage current-limiting protection apparatus for key water-control project |
| CN107465141A (en) * | 2016-06-03 | 2017-12-12 | 有能集团江苏电气有限公司 | A kind of vacuum circuit breaker |
| CN106849022A (en) * | 2017-03-02 | 2017-06-13 | 安徽伊格瑞德电气设备有限公司 | A kind of busbar voltage holding meanss based on current limliting zinc oxide FR |
| CN106849030A (en) * | 2017-03-02 | 2017-06-13 | 安徽伊格瑞德电气设备有限公司 | A kind of high-voltage and current-limitation device based on current limliting zinc oxide FR |
| CN106936118A (en) * | 2017-04-16 | 2017-07-07 | 安徽徽电科技股份有限公司 | A kind of HDF Large Copacities busbar voltage holding meanss |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20151116 |
|
| EXPY | Termination of patent right or utility model |