CN205123239U - Novel fragmentary magnetic flow short -circuit current limiter - Google Patents
Novel fragmentary magnetic flow short -circuit current limiter Download PDFInfo
- Publication number
- CN205123239U CN205123239U CN201520783776.5U CN201520783776U CN205123239U CN 205123239 U CN205123239 U CN 205123239U CN 201520783776 U CN201520783776 U CN 201520783776U CN 205123239 U CN205123239 U CN 205123239U
- Authority
- CN
- China
- Prior art keywords
- current
- secondary side
- winding coil
- side winding
- instrument transformer
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a novel fragmentary magnetic flow short -circuit current limiter, including once incline current transformer (2), one time side winding coil (3), current detection and controlling means (5), secondary side current transformer (6), electric capacity (7), secondary side winding coil (8), dc -to -ac converter (9) and iron core (10). Through current detection and controlling means (5) accepting once to incline the current value, then dc -to -ac converter (9) of control secondary side produce one with the opposite and proportional offset current injection secondary side winding coil (8) of the direction of current flow that once inclines. When system's normal operating, make the interior main flux of iron core (10) be zero through pouring into the secondary side electric current into for one time side winding coil (3) present the low resistance resistance, when system short -circuit fault, the secondary side electric current is cut off, makes one time side winding coil (3) of establishing ties in the system present the high resistant resistance owing to the effect of excitation impedance. The utility model discloses can reach outstanding current -limiting effect under convenient control.
Description
Technical field
The utility model relates to electric power system power transmission and distribution technical field, and being specifically related to is short-circuited when fault produces big current at transmission line carries out effective a kind of novel Zero flux short circuit current limiter limited to it.
Background technology
Along with continuous rapid advances that is social and scientific and technological level, the installed capacity of electric power system increases thereupon day by day, along with the development of the Internet and technology of Internet of things, the interconnected degree of electric power system is also more and more higher, and the progress of these technology also makes that the short-circuit impedance in network system reduces relatively and short circuit current grade sharply increases.In order to reduce short circuit current, segmenting system must be adopted or set up current limiter, and electric power system segmentation needs to plan electrical network entirety and dispatch, and likely can cause system oscillation and larger fault.Therefore, adopt fault current limiter to carry out restriction to short circuit current and seem more necessary and urgent.
The design of flow restricter more than tens of kinds, is summed up and is mainly divided into two large classes: superconduct short circuit current limiter, series resonance-type short circuit current limiter.Due to the factor of technology and Financial cost each side, the superhigh pressure short circuit current limiter of Current commercialization application is also few, and superconduct short circuit current limiter is applied to extra high voltage network and is also confronted with numerous difficulties, main cause be superconductor under high pressure stability and reliability be difficult to ensure; It is too high that series resonance-type short circuit current limiter then also exists electric capacity pressure-bearing, increases reactive loss and the large high in cost of production defect of equipment volume.
Utility model content
For the deficiency of existing short circuit current limiter, the utility model proposes a kind of novel Zero flux short circuit current limiter, to solve the difficult problem that current power net short circuit current restriction field exists.
The utility model solves the technical scheme that its technical problem adopts: a kind of novel Zero flux short circuit current limiter, comprise primary side current instrument transformer (2), first side winding coil (3), current detecting and control device (5), secondary side current instrument transformer (6), electric capacity (7), secondary side winding coil (8), inverter (9) and iron core (10), described primary side current instrument transformer (2) and secondary side current instrument transformer (6) all adopt bus-type current transformer.
Of the present utility modelly to be set to further: described iron core (10) material adopts neodymium.
Of the present utility modelly to be set to further: in described inverter (9), select IGBT type solid-state switch as high-speed switch.
Of the present utility modelly to be set to further: described current detecting and control device (5) take DSP as core, by SVPWM control inverter (9).
The beneficial effects of the utility model are: this novel Zero flux short circuit current limiter is very little for the impact of electrical power trans mission/distribution system under normal operating condition; When system is short-circuited fault, this novel Zero flux short circuit current limiter can detect fault rapidly and before fault current reaches first crest, action occur, and reduces the operating pressure of circuit breaker; This novel Zero flux short circuit current limiter successfully abandons direct current biasing system simultaneously, and uses three iron cores just can realize three-phase protective, reduces cost, volume and weight.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model.
Fig. 2 is the transformer device structure figure be made up of first side winding coil, secondary side winding coil and iron core in the utility model.
Wherein, 1. system power supply, 2. primary side current instrument transformer, 3. first side winding coil, 4. load, 5. current detecting and control device, 6. secondary side current instrument transformer, 7. electric capacity, 8. secondary side winding coil, 9. inverter, 10. iron core.
Embodiment
In order to the utility model embodiment or technical scheme of the prior art are more clearly described, do concise and to the point introduction by accompanying drawing required in embodiment or description of the prior art below, but claimed scope is not limited to this.
As shown in Figure 1, a novel Zero flux short circuit current limiter, comprises primary side current instrument transformer 2, first side winding coil 3, current detecting and control device 5, secondary side current instrument transformer 6, electric capacity 7, secondary side winding coil 8, inverter 9 and iron core 10.Electric current on first and second circuit recorded is sent to current detecting and control device 5 by primary side current instrument transformer 2 and secondary side current instrument transformer 6.Current detecting and control device 5 take DSP as core, by SVPWM control inverter 9.Inverter 9 produces an offset current contrary and proportional with primary side current direction and injects secondary side winding coil 8 when system worked well, main flux in iron core 10 is made to be zero by injecting secondary side current, make first side winding coil 3 present low resistivity, thus influential system does not normally run.Do not produce secondary side current when the system failure, make the first side winding coil 3 of the system that is series at present high resistant resistance due to the effect of excitation impedance, thus effectively suppress short circuit current.An electric capacity 7 is adopted to be connected to inverter 9 to provide galvanic current source.
As shown in Figure 2, in the utility model, transformer device structure is made up of first side winding coil 3, secondary side winding coil 8 and iron core 10.Systematic selection neodymium is as iron core 10 material, and neodymium has larger coercive force and magnetic flux density is also enough large, and core section is long-pending is designed to 20cm20cm, and the length of magnetic path is 2.3m, and coil turn is all 6.Iron core 10 selects there is air gap type, and due to the existence of air gap, other structure transformer of ratio that no-load current accounts for rated current is large many, therefore be more easy to realize in counteracting first-harmonic main flux, and it is linear to realize the maintenance of iron core 10 magnetic conductance.
Claims (4)
1. a novel Zero flux short circuit current limiter, comprise primary side current instrument transformer (2), first side winding coil (3), current detecting and control device (5), secondary side current instrument transformer (6), electric capacity (7), secondary side winding coil (8), inverter (9) and iron core (10), it is characterized in that: described primary side current instrument transformer (2) and secondary side current instrument transformer (6) all adopt bus-type current transformer, primary side current instrument transformer (2) and secondary side current instrument transformer (6) will record one, electric current on secondary line is sent to current detecting and control device (5), thus control inverter (9) produces offset current injection secondary side winding coil (8) when system worked well, iron core (10) interior main flux is made to be zero, and first side winding coil (3) presents low resistivity, thus influential system does not normally run.
2. a kind of novel Zero flux short circuit current limiter according to claim 1, is characterized in that: described iron core (10) material adopts neodymium.
3. a kind of novel Zero flux short circuit current limiter according to claim 1, is characterized in that: select IGBT type solid-state switch as high-speed switch in described inverter (9).
4. a kind of novel Zero flux short circuit current limiter according to claim 1, is characterized in that: described current detecting and control device (5) take DSP as core, by SVPWM control inverter (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520783776.5U CN205123239U (en) | 2015-10-12 | 2015-10-12 | Novel fragmentary magnetic flow short -circuit current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520783776.5U CN205123239U (en) | 2015-10-12 | 2015-10-12 | Novel fragmentary magnetic flow short -circuit current limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205123239U true CN205123239U (en) | 2016-03-30 |
Family
ID=55578815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520783776.5U Expired - Fee Related CN205123239U (en) | 2015-10-12 | 2015-10-12 | Novel fragmentary magnetic flow short -circuit current limiter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205123239U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023027594A1 (en) * | 2021-08-25 | 2023-03-02 | Enatel | Zero current sensor for a power converter |
-
2015
- 2015-10-12 CN CN201520783776.5U patent/CN205123239U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023027594A1 (en) * | 2021-08-25 | 2023-03-02 | Enatel | Zero current sensor for a power converter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Chen et al. | Study on the application of a flux-coupling-type superconducting fault current limiter for decreasing HVDC commutation failure | |
| CN102723704B (en) | Magnetic switch type short-circuit current fault detection method and device for same | |
| CN103632895B (en) | A kind of DC circuit breaker | |
| CN103647264B (en) | Close coupling type power failure current limiter | |
| CN105262072A (en) | Mixed type magnetic saturation fault current limiter | |
| CN105391039B (en) | A kind of parallel connection type magnetic saturation fault current limiter based on rare earth permanent-magnetic material | |
| CN101707364A (en) | Self-triggering DC reactor current limiter and applications thereof | |
| JP5187750B2 (en) | Magnetic saturation type fault current limiter | |
| Yuan et al. | Optimized design method of permanent magnets saturated core fault current limiters for HVDC applications | |
| CN102025138A (en) | Parallel superconducting fault current limiter | |
| CN106300309A (en) | A kind of flexible direct current electric network fault current limiter with fast restoration capabilities | |
| CN205123239U (en) | Novel fragmentary magnetic flow short -circuit current limiter | |
| CN202840498U (en) | Novel magnetic-shielding air core transformer coupling bridge type solid-state current limiter | |
| CN202663104U (en) | Short-circuit current limit device | |
| Guo et al. | Optimized design and electromagnetic analysis of a hybrid type DC SFCL in MMC system | |
| CN103354145A (en) | Sectional type winding structure of superconducting fault current limiter | |
| CN105529694A (en) | Saturated core-type fault current limiter capable of relieving DC impact | |
| CN103887782A (en) | Hybrid type flux coupling superconduction fault current limiter and current limitation method | |
| CN203932992U (en) | A kind of mixed type magnetic flux Coupled Superconducting fault current limiter | |
| CN100345319C (en) | Superconducting saturable core fault current limiter | |
| CN101320614B (en) | Superconducting winding with protection circuit | |
| CN201549881U (en) | Self-triggered direct current reactor type current limiter | |
| CN102324736A (en) | Magnetron type fault current limiter | |
| CN203660523U (en) | Strong coupling type electric power failure current limiter | |
| CN102664393A (en) | Short-circuit current limiting device |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160330 Termination date: 20161012 |