CN201611763U - Intelligent type fast current-limiting protection device with large capacity - Google Patents
Intelligent type fast current-limiting protection device with large capacity Download PDFInfo
- Publication number
- CN201611763U CN201611763U CN200920093763XU CN200920093763U CN201611763U CN 201611763 U CN201611763 U CN 201611763U CN 200920093763X U CN200920093763X U CN 200920093763XU CN 200920093763 U CN200920093763 U CN 200920093763U CN 201611763 U CN201611763 U CN 201611763U
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- current
- limiting
- protection device
- fast current
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Abstract
The utility model relates to an emergency circuit protection device, in particular to an intelligent type fast current-limiting protection device with large capacity. The fast current-limiting protection device comprises a fast current-limiting protector with large capacity, a microcomputer controller and a current transformer. The fast current-limiting protection device is characterized in that the device also comprises a vacuum switch; the fast current-limiting protector with large capacity comprises a zinc oxide non-linear resistor R2 and a zinc oxide non-linear resistor R1 with a parallel gap G; the R1 and the R2 are connected in series and then are connected in parallel with a high-voltage current-limiting fuse FU; the vacuum switch is connected in series with the fast current-limiting protector with large capacity; the high-voltage current-limiting fuse FU of the fast current-limiting protector with large capacity is connected with the input end of the microcomputer controller through an operating contact K; and the output end of the microcomputer controller is connected with the vacuum switch. The fast current-limiting protection device has the advantages of simple structure, convenient operation and maintenance, low cost, reliable running and the like, and is applicable to lines and transformers in an electric power system with larger short-circuit capacity, in particular to series branches at the output end of a generator, such as circuits with an exciting transformer, a unit transformer, an insulating transformer, and the like.
Description
Technical field
The utility model relates to the circuit emergency protective device, is the quick current-limiting protection device of the big capacity of a kind of intelligence.
Background technology
Along with the development of modernization industry, the single-machine capacity of power supply constantly increases, and the application of capacity electrical equipment in 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 relay protection operate time+circuit breaker; generally need three cycle 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
Technical problem to be solved in the utility model is, overcomes the deficiency that prior art exists, and design provides a kind of simple in structure, operation, easy to maintenance, and cost is low, and is reliable, the big quick current-limiting protection device of capacity of the intelligence of applied range.
Solving the technical scheme that its technical problem adopts is: the quick current-limiting protection device of the big capacity of a kind of intelligence; it comprises the quick limiting protector of big capacity; the microcomputerized controller summation current transformer; it is characterized in that: also comprise vacuum switch; it is in parallel after the quick limiting protector of described big capacity comprises znr R2 and the zinc oxide linear resistance R1 of band parallel connection gaps G connects with high-voltage and current-limitation fuse FU; described vacuum switch is connected with the big quick limiting protector of capacity; the high-voltage and current-limitation fuse FU of the quick limiting protector of described big capacity is connected with the input of microcomputerized controller by action connection point K, and the output of microcomputerized controller is connected with vacuum switch.
The quick current-limiting protection device of the big capacity of intelligence of the present utility model compared with prior art; owing to adopt microcomputerized controller to cooperate with vacuum switch; both avoided the two-phase operation of prior art three phase supply; avoided a fuse failure or line to line fault must change three shortcomings that the interruption duration that fuse caused is long, operating cost is high again; have simple in structure simultaneously; operation, easy to maintenance, advantage such as cost is low, and is reliable.The direct connection branch road of circuit, transformer, particularly generator outlet end that can be widely used in the electric power system of big capacity of short circuit, the protection of cut-offfing as the big capacity current limliting in loops such as excitation change, unit transformer, isolation change.
Description of drawings
Fig. 1 is the structural representation of the big quick current-limiting protection device of capacity of the utility model intelligence.
Among the figure; 1 vacuum switch, 2 microcomputerized controllers, 3 current transformers, the quick limiting protector of 4 big capacity.
Embodiment
With reference to Fig. 1, the quick current-limiting protection device of the big capacity of intelligence of the present utility model comprises the quick limiting protector 4 of big capacity, vacuum switch 1, microcomputerized controller 2 summation current transformers 3.It is in parallel after the quick limiting protector 4 of described big capacity comprises znr R2 and the zinc oxide linear resistance R1 of band parallel connection gaps G connects with high-voltage and current-limitation fuse FU.Described vacuum switch 1 is connected with the big quick limiting protector 4 of capacity, and the rated current of the big quick limiting protector 4 of capacity is at 10A～500A, and its drop-out current can reach 200kA.The high-voltage and current-limitation fuse FU of the quick limiting protector 4 of described big capacity is connected with the input of microcomputerized controller 2 by action connection point K, and the output of microcomputerized controller 2 is connected with vacuum switch 1.
Unit, device that the quick current-limiting protection device of the big capacity of intelligence of the present utility model is adopted are easy to get, and zinc oxide linear resistance R1, vacuum switch 1, microcomputerized controller 2, the current transformer 3 of znr R2, band parallel connection gaps G are the commercially available prod.Wherein: vacuum switch 1 adopts the high-pressure vacuum breaker or the high voltage load switch of commercially available low capacity all can.
When the quick current-limiting protection device of the big capacity of intelligence of the present utility model uses; its vacuum switch 1 end is connected with power supply; big quick limiting protector 4 ends of capacity are connected with the three-phase electric equipment; mainly constitute the big quick current-limiting protection device of capacity of intelligence with microcomputerized controller 2 by the quick limiting protector 4 of the vacuum switch 1 big capacity of series connection; the frequent switch of running current and cut-off by vacuum switch 1 than the overcurrent of low capacity and to finish, the short circuit current of high-capacity is cut-off by jumbo high-voltage and current-limitation fuse FU.Monitor by 2 pairs of electric currents that flow through of microcomputerized controller and high-voltage and current-limitation fuse FU operating state; and control vacuum switch 1 deciliter; to require two kinds of functional separations of different control and protection to device for switching; few especially big short circuit current that takes place cut-offs excision by the quick limiting protector 4 of big capacity, and the overcurrent of running current and low capacity is cut-off excision by vacuum switch 1.
The big capacity fast current-limiting protection device of intelligence of the present utility model has: the effect that rapidity adds current limliting is; short circuit current just was cut off before rising to peak value; so that the generator in the short-circuit loop, transformer, breaker and cable no longer are subjected to the impact of peak value of short electric power and fuel factor, thereby prolonged service life.
The big capacity fast current-limiting protection device of intelligence of the present utility model can improve dynamic stability and the heat endurance of electrical network greatly when short circuit accident, thereby reduces the investment cost of equipment.
The big capacity fast current-limiting protection device of intelligence of the present utility model can be opened under lower voltage; can transfer to rapidly arc current among the high-voltage and current-limitation fuse FU in self; absorb magnetic field energy, fast that current attenuation is extremely zero, make power supply that the energy minimum is provided.
The protection feature of the big capacity fast current-limiting protection device of intelligence of the present utility model is determined by physical characteristic, does not exist mechanical tripping to make the reliability height.
Claims (1)
1. quick current-limiting protection device of the big capacity of intelligence; it comprises the quick limiting protector of big capacity; the microcomputerized controller summation current transformer; it is characterized in that: also comprise vacuum switch; it is in parallel after the quick limiting protector of described big capacity comprises znr R2 and the zinc oxide linear resistance R1 of band parallel connection gaps G connects with high-voltage and current-limitation fuse FU; described vacuum switch is connected with the big quick limiting protector of capacity; the high-voltage and current-limitation fuse FU of the quick limiting protector of described big capacity is connected with the input of microcomputerized controller by action connection point K, and the output of microcomputerized controller is connected with vacuum switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920093763XU CN201611763U (en) | 2009-06-08 | 2009-06-08 | Intelligent type fast current-limiting protection device with large capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920093763XU CN201611763U (en) | 2009-06-08 | 2009-06-08 | Intelligent type fast current-limiting protection device with large capacity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201611763U true CN201611763U (en) | 2010-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920093763XU Expired - Fee Related CN201611763U (en) | 2009-06-08 | 2009-06-08 | Intelligent type fast current-limiting protection device with large capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201611763U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410058A (en) * | 2014-11-21 | 2015-03-11 | 国家电网公司 | 10000 volt power grid neutral point grounding device |
| CN104953572A (en) * | 2015-07-23 | 2015-09-30 | 合肥扬帆通信元器件有限公司 | Bus residual voltage holding device |
-
2009
- 2009-06-08 CN CN200920093763XU patent/CN201611763U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410058A (en) * | 2014-11-21 | 2015-03-11 | 国家电网公司 | 10000 volt power grid neutral point grounding device |
| CN104953572A (en) * | 2015-07-23 | 2015-09-30 | 合肥扬帆通信元器件有限公司 | Bus residual voltage holding device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: RIXIN HENGTONG ELECTRIC CO., LTD. Free format text: FORMER NAME: JILIN HENGTONG HIGH VOLTAGE ELECTRIC CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 132002, Yingbin Road, Jilin, Jilin, 1199 Patentee after: Nissin Hengtong Electric Co., Ltd. Address before: 132002, Yingbin Road, Jilin, Jilin, 1199 Patentee before: Jilin Hengtong High Voltage Electric Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101020 Termination date: 20150608 |
|
| EXPY | Termination of patent right or utility model |