CN2726190Y - Large capacity high-voltage current-limiting fuse combination protector - Google Patents
Large capacity high-voltage current-limiting fuse combination protector Download PDFInfo
- Publication number
- CN2726190Y CN2726190Y CN 200420079581 CN200420079581U CN2726190Y CN 2726190 Y CN2726190 Y CN 2726190Y CN 200420079581 CN200420079581 CN 200420079581 CN 200420079581 U CN200420079581 U CN 200420079581U CN 2726190 Y CN2726190 Y CN 2726190Y
- Authority
- CN
- China
- Prior art keywords
- current
- limiting fuse
- large capacity
- vacuum switch
- fuse
- 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
Links
Abstract
The utility model relates to a protector capable of limiting short circuit current automatically and breaking quickly and reliably when short circuit occurs in a large capacity power system, in particular to a large capacity high-voltage current-limiting fuse combination protector. The large capacity high-voltage current-limiting fuse combination protector is characterized in that a large capacity high-voltage current-limiting fuse is adopted; wherein, a basic zinc-oxide nonlinear resistor is connected in series with a zinc-oxide nonlinear resistor which is provided with parallel interspaces, and then the basic zinc-oxide nonlinear resistor is connected in parallel with a high-voltage current-limiting fuse, so that the large capacity high-voltage current-limiting fuse can be formed. The large capacity high-voltage current-limiting fuse combination protector has the advantages of simple structure, convenient operation and maintenance, low cost, reliable running, etc., being applicable for protecting lines and transformers with larger short-circuit power, and the direct connection branch of the outlet terminal of an electric generator.
Description
Technical field
The utility model relates to a kind of protective device that a kind of bulk power system volitional check short circuit current and fast and reliable when being short-circuited are cut-off.
Background technology
Along with the development of electric power system and modernization industry, single-machine capacity constantly increases, and the application of Container in modernized low-voltage distribution system of the low-resistance Chinese People's Anti-Japanese Military and Political College constantly increases, and the continuous development of distribution network, and the capacity of short circuit of electric power system is increased day by day.Improve the harsher requirement brought for satisfying short circuit current, conventional way is to seal in current limiting reactor in electrical network, but when electrical network normally moves, because voltage landing and loss are arranged on reactor, the transmission of electricity quality of electrical network is had certain influence.Simultaneously, because this current-limiting reactor can not be too big, so when fault takes place, can not reduce short circuit current significantly.Reactor can only change the peak value of electric 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 cycles, and the peak value of short circuit current causes cumulative bad to destroy repeatedly by short-circuit network to grid.Particularly generator outlet short circuit, short circuit current will could zero crossing through the time that reaches 20ms-150ms, make circuit breaker cut-off difficulty, switch off time is very long, the peak value of short circuit current repeatedly impacts electric equipment, generator is produced very big electric power and thermal effect effect, on the switch electrical contact, produce very big repulsion electric power and make contact burning or melting welding.Short circuit test proves; when oil-immersed type transformer is short-circuited; for fuel tank is not exploded; must in 20ms, excise fault; and the standard-sized sheet break time of circuit breaker is made up of three parts; intrinsic operate time+arcing time of relaying protection operate time+circuit breaker generally needs three cycles (60ms), thereby can not protect transformer effectively.For the in parallel single znr scheme of high-voltage and current-limitation fuse, along with high-voltage and current-limitation fuse technology and manufacturing process progress, the overvoltage that produces in the fusing process all limits very lowly, single znr in parallel can not be opened or can not lead to by standard-sized sheet, thereby just can not realize that also turn of tidal stream moves the function of energy.
Summary of the invention
The purpose of this utility model is; the deficiency of avoiding above-mentioned technology to exist; design provides a kind of circuit, transformer with electric power system of big capacity of short circuit; particularly the direct connection branch road of generator outlet end cut-offs protective device as the big capacity current limliting in loops such as excitation change, unit transformer, isolation change.
The purpose of this utility model is achieved through the following technical solutions:
Big capacity high current limiting fuse assembled protector comprises current limiting fuse, vacuum switch and microcomputerized controller, and it is characterized in that: described current limiting fuse is big capacity high current limiting fuse, and described vacuum switch is a high-pressure vacuum switch;
Described big capacity high current limiting fuse is connected back by basic znr R2 with the znr R1 of band parallel connection gaps G and high-voltage and current-limitation fuse FU composes in parallel, connect with the high-pressure vacuum switch (2) of low capacity again, rated current is at 10A-500A, and its drop-out current can reach 300kA;
High-voltage and current-limitation fuse FU is connecting the input of microcomputerized controller by action connection point K; The output of microcomputerized controller is connecting the high-pressure vacuum switch that links to each other with the power supply union end;
This device is connected between power supply and the three-phase electric equipment, and an end of high-pressure vacuum switch is connecting power supply, and basic znr R2 is connecting the three-phase electric equipment with the contact end of high-voltage and current-limitation fuse FU.
The low capacity high-pressure vacuum switch big capacity high current limiting fuse of connecting constitutes combined protection electrical equipment with microcomputerized controller; the frequent switch of running current and cut-off by high-pressure vacuum switch than the overcurrent of low capacity and to finish, the short circuit current of high-capacity is cut-off by big capacity high current limiting fuse.
Design feature of the present utility model is: basic znr is connected back with the znr of band parallel connection gaps and high-voltage and current-limitation fuse composes in parallel big capacity current limiting fuse; connect with the high-pressure vacuum switch (vacuum circuit-breaker or on-load switch) of low capacity again; connect and three-phase electric equipment and power supply between; and the electric current and the current limiting fuse operating state that flow through are monitored by microcomputerized controller; and control high-pressure vacuum switch deciliter; to require two kinds of functional separations of different control and protection to device for switching; few take place especially big short circuit current cut-off excision by big capacity high current limiting fuse, the overcurrent of running current and low capacity is cut-off excision by high-pressure vacuum switch.
The utlity model has rapidity and add the advantage of current limliting, short circuit current just was cut off before rising to peak value, make generator, transformer, circuit breaker and cable in the short-circuit loop no longer be subjected to the impact of peak value of short electric power and thermal effect, thereby prolonged useful life; The utility model can improve the dynamic stability and the thermal stability of electrical network greatly when short circuit accident, thereby reduces investment cost of equipment.The utility model moves and can open under lower voltage by element, and arc current in the fuse is transferred to rapidly in self, absorbs magnetic field energy, and is fast that current attenuation is extremely zero, makes power supply that the energy minimum is provided.Protective feature of the present utility model is determined by physical characteristic, does not exist mechanical tripping to make the reliability height.The utility model microcomputerized controller cooperates with vacuum switch, has both avoided two-phase operation, has avoided a fuse failure or line to line fault must change three fuses, interruption duration is long, operating cost is high shortcoming again.
The utlity model has advantages such as simple in structure, convenient operating maintenance, cost are low, reliable, can be widely used in circuit, transformer with big capacity of short circuit, the protection of the direct connection branch road of generator outlet end has broad application prospects.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described by embodiment.
Embodiment:
See Fig. 1, the utility model mainly is made up of big capacity high current limiting fuse and high-pressure vacuum switch 1 and microcomputerized controller 2.Big capacity high current limiting fuse is moved and can be formed by element by high-voltage and current-limitation fuse FU and combination, and combination moves and can be made up of parallel connection gaps G, basic znr R2 and parallel connection gaps znr R1 by element.
When short circuit occurring, short circuit current rises to certain value, the high-voltage and current-limitation fuse FU fusing generation arc voltage that dams, arc current partly is transferred among ZnO resistors R1, the R2, the electric current that flows through ZnO resistors R1, R2 is increased rapidly, pressure drop on the ZnO resistors R1 impels parallel connection gaps G to puncture, and forces arc current all to be transferred to decay fast among the ZnO resistors R2.ZnO resistors R2 is the zinc oxide nonlinear element, and thermal capacity is big, and logical good fluidity plays the effect of extinguishing fuse electric arc fast.When fuse FU in the at first fusing mutually of a certain short-circuit current value, when all the other two-phase fuses did not also fuse, the short circuit current of this moment was if surpass the connecting-disconnecting function of vacuum switch 1, the trip(ping) circuit of locking vacuum switch, three-phase current is all cut-off by fuse FU; If short-circuit current value is in the connecting-disconnecting function scope of vacuum switch, vacuum switch trips immediately.Because the intrinsic opening time of vacuum switch reaches tens ms, system voltage is born in ZnO resistors R1, R2 series connection at this moment jointly, guarantees ZnO resistors safety.
The current signal that microcomputerized controller 2 provides according to circuit, whether judgment device or circuit are short-circuited, the short circuit current size, if short circuit current surpasses the connecting-disconnecting function of vacuum switch 1, microcomputerized controller 2 is with regard to the trip(ping) circuit of locking vacuum switch, and short circuit current is cut-off by big capacity current limiting fuse FU, if short circuit current is in the connecting-disconnecting function scope of vacuum switch 1, microcomputerized controller 2 sends instruction immediately, makes the vacuum switch tripping operation.The action connection point K signal that microcomputerized controller 2 provides according to fuse, make the vacuum switch tripping operation, avoid the big capacity current limiting fuse FU one system's phase-deficient operation that fuses mutually, microcomputerized controller 2 record trouble information avoid line to line fault must change the unfavorable of three fuses simultaneously.
Claims (1)
1, big capacity high current limiting fuse assembled protector comprises current limiting fuse, vacuum switch and microcomputerized controller, and it is characterized in that: described current limiting fuse is big capacity high current limiting fuse, and described vacuum switch is a high-pressure vacuum switch;
Described big capacity high current limiting fuse is connected back by basic znr R2 with the znr R1 of band parallel connection gaps G and high-voltage and current-limitation fuse FU composes in parallel, connect with the high-pressure vacuum switch (2) of low capacity again, rated current is at 10A-500A, and its drop-out current can reach 300kA;
High-voltage and current-limitation fuse FU is connecting the input of microcomputerized controller by action connection point K; The output of microcomputerized controller is connecting the high-pressure vacuum switch that links to each other with the power supply union end;
This device is connected between power supply and the three-phase electric equipment, and an end of high-pressure vacuum switch is connecting power supply, and basic znr R2 is connecting the three-phase electric equipment with the contact end of high-voltage and current-limitation fuse FU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420079581 CN2726190Y (en) | 2004-09-17 | 2004-09-17 | Large capacity high-voltage current-limiting fuse combination protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420079581 CN2726190Y (en) | 2004-09-17 | 2004-09-17 | Large capacity high-voltage current-limiting fuse combination protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2726190Y true CN2726190Y (en) | 2005-09-14 |
Family
ID=35040894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420079581 Expired - Fee Related CN2726190Y (en) | 2004-09-17 | 2004-09-17 | Large capacity high-voltage current-limiting fuse combination protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2726190Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101236864B (en) * | 2007-02-01 | 2012-09-26 | 施耐德电器工业公司 | Voltage surge protection device with a movable contact comprising selective disconnection means against short-circuits |
| CN104410058A (en) * | 2014-11-21 | 2015-03-11 | 国家电网公司 | 10000 volt power grid neutral point grounding device |
| CN109243939A (en) * | 2018-08-27 | 2019-01-18 | 西安中熔电气股份有限公司 | A kind of low-power consumption high response speed circuit protection device |
| CN109428316A (en) * | 2018-11-05 | 2019-03-05 | 广州小鹏汽车科技有限公司 | A kind of the fuse protection method and automobile batteries management system of overcurrent |
-
2004
- 2004-09-17 CN CN 200420079581 patent/CN2726190Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101236864B (en) * | 2007-02-01 | 2012-09-26 | 施耐德电器工业公司 | Voltage surge protection device with a movable contact comprising selective disconnection means against short-circuits |
| CN104410058A (en) * | 2014-11-21 | 2015-03-11 | 国家电网公司 | 10000 volt power grid neutral point grounding device |
| CN109243939A (en) * | 2018-08-27 | 2019-01-18 | 西安中熔电气股份有限公司 | A kind of low-power consumption high response speed circuit protection device |
| CN109243939B (en) * | 2018-08-27 | 2024-04-16 | 西安中熔电气股份有限公司 | Low-power consumption high response speed circuit protection device |
| CN109428316A (en) * | 2018-11-05 | 2019-03-05 | 广州小鹏汽车科技有限公司 | A kind of the fuse protection method and automobile batteries management system of overcurrent |
| CN109428316B (en) * | 2018-11-05 | 2020-06-12 | 广州小鹏汽车科技有限公司 | Overcurrent fusing protection method and automobile battery management system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101557101B (en) | Relay protection method for eliminating failure in transformer dead zone | |
| CN101651323B (en) | Method, device and application for self-recovery current limiting and circuit breaking by using conductive fluid and magnetic fluid | |
| CN107134762B (en) | A kind of based superconductive current limliting without arc dc circuit breaker and cutoff method | |
| CN201426033Y (en) | Self-recovery current limiting circuit break device by utilizing conductive fluid and magnetic fluid | |
| CN201122840Y (en) | Intelligent neutral point resistance grounding device | |
| CN202353174U (en) | Combined protector of high-voltage current limiting fuse | |
| CN2726190Y (en) | Large capacity high-voltage current-limiting fuse combination protector | |
| CN111863465B (en) | Double-station circuit breaker, direct-current combined electrical apparatus applying same and working method | |
| CN201181682Y (en) | Multifunctional small circuit breaker | |
| CN2857211Y (en) | Drop-out device for large capacity vacuum short-circuit current | |
| CN201490693U (en) | Large-capacity high-speed current-limiting protection device | |
| CN201611763U (en) | Intelligent type fast current-limiting protection device with large capacity | |
| CN202424110U (en) | High-capacity fast switching device | |
| CN110311354A (en) | Large capacity mixed DC breaker and current limliting method for dividing are pressed in one kind | |
| CN201278455Y (en) | Large capacity high voltage current limiting protection apparatus | |
| CN102457058A (en) | Arc-extinguishing voltage limiting device based on electronic switch | |
| CN109411168B (en) | Method for enabling low-voltage lightning arrester to have automatic separation function | |
| CN106159879B (en) | A kind of combined mass circuit breaker system | |
| CN206076914U (en) | A kind of combined mass circuit breaker system | |
| CN201638767U (en) | Surge protection device | |
| CN201191545Y (en) | Switching overvoltage absorption apparatus | |
| CN2694467Y (en) | Outdoors duplex melting tube high-tension drop type fuse | |
| CN2471004Y (en) | Crowbar device of neutral point directly grounding system | |
| CN2459751Y (en) | Current limiting fused combined protector | |
| US11908645B2 (en) | Enabling equipment to withstand and control the effects of internal arcing faults |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20050914 Termination date: 20120917 |