CN101546908A - Saturated iron core type superconducting current limiter with direct current control system and method for controlling same - Google Patents
Saturated iron core type superconducting current limiter with direct current control system and method for controlling same Download PDFInfo
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Abstract
The invention relates to a saturated iron core type superconducting fault current limiter with a direct current control system, which comprises a superconducting magnet, a reactance system, namely an iron core and an alternating current winding, a refrigeration system and a monitoring system and also comprises a direct current control system which is connected with two ends of the superconducting magnet and connected with the monitoring system by a data wire; the direct current control system comprises a direct current power module, a magnetic energy absorption module and a control module. The invention also provides a method for controlling the current limiter; when an electric net has normal operation, the control module of the direct current control system automatically adjusts the size of the direct current excitation current in the superconducting magnet according to the size of load in the electric net; when the electric net has short-circuit fault, the control module actively cuts off a direct current loop, simultaneously releases the magnetic energy of the superconducting magnet and clamps the overvoltage; the total iron core of the current limiter participates in the current limiting; and after the fault of the electric net is removed or cut, the control module improves the output voltage of the power supply and forces the superconducting magnet to rapidly magnetize through a power electronic switch so that the current limiter can be rapidly restored to a low resistance state.
Description
Technical field
The present invention relates to a kind of superconductive current limiter, particularly have the saturated core type superconductive failure current limiter and the control method thereof of DC control system, it also comprises DC control system except that having superconducting magnet, reactance system, cryogenic system, supervisory control system.This DC control system comprises that DC power supplier, magnetic energy absorb module and control module.The present invention can regulate the size of electric current in the superconducting magnet automatically, so the operation of flow restricter have higher economical property when the steady operation of protection power network line; And in the time of on the electrical network position of being protected, being short-circuited fault; automatically discern fault; by cutting off the electric current in the superconducting magnet; the flow restricter fault current that participates in the restriction electrical network all unshakable in one's determination; so; both can prevent the threat of induction overvoltage, also improve the current limliting efficient of flow restricter greatly low-voltage equipments such as DC power supply.
The present invention is mainly used in that electric power is defeated, the short circuit current protection of power distribution network and power equipment, the particularly protection of the short circuit current in high pressure and the extra-high voltage grid.
Background technology
Along with the development of superconductor technology, the installation superconductive failure current limiter is used to limit short-circuit current in electrical network becomes possibility.At present, in various types of superconductive current limiters of whole world development, saturated core type superconductive failure current limiter integrates detection, triggering and current limliting, and in the current limliting process quench not, be desirable, the most promising current-limiting apparatus at present.
Saturated core type superconductive current limiter in the past is made up of iron core group, AC Windings, superconducting magnet, four parts of DC power supply, and wherein superconducting magnet is made up of the DC superconducting winding substantially.Superconducting magnet is two iron cores arranged side by side, and excitation is provided, two AC coil, connect with a definite form, on two iron cores, cancelling out each other at center pillar (being the core limb that superconducting magnet is twined) in the magnetic field that they are produced, thereby reduces the influence of ac induction voltage to the DC excitation winding respectively.During the flow restricter steady operation, it is saturated that DC excitation makes iron core be in the degree of depth, and magnetic permeability unshakable in one's determination is lower, and the inductance of AC coil is little, do not influence electrical network; When the current limliting attitude, rely on powerful short-circuit current rush in half-wave, to make one of them demagnetization unshakable in one's determination, another magnetic field unshakable in one's determination is strengthened, and realizes singlecore current limliting (be in the reactor that increases magnetic state and do not participate in current limit).This mode is called the passive type current limliting, though can play the effect of current limliting, significant disadvantages is arranged, and has weakened the current limitation effect of flow restricter first, causes huge iron core of needs and AC Windings just can reach corresponding current limitation effect; Second the impact that DC side certainly will will bear high induction voltage; Three DC power supply must be constant-current sources, if there is bigger current disturbing in power supply, current limitation effect will weaken greatly.Therefore, traditional saturated core type superconductive current limiter is considered to cost height, big, the insoluble current limliting form of power technology of volume weight always, is difficult in practice be applied.
Moreover no matter electrical network moves under which kind of mode, the output of DC power supply all is changeless on the flow restricter.If when electrical network moves under less load, the direct current loss on the flow restricter will influence the overall operation efficiency of flow restricter.Therefore, the application of saturated core type flow restricter exists bigger limitation in the past.
The applicant is once in application on July 28th, 2004 patent of invention " current-limiting type superconductive failure current limiter fast ", proposed to solve the method that induction overvoltage 2 is pressed from principle, when electrical network is short-circuited, utilize the induction overvoltage on the superconducting magnet to come order induction circuit breaker to cut off DC loop, guarantee that DC loop can not be subjected to the threat of induction overvoltage.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art and defective, propose a kind of saturated core type superconductive current limiter and control method thereof, utilize the power electronics control technology, become the passive type current limliting and be active current limliting with DC control system.When electrical network normally moved, promptly superconducting magnet operated in excited state, can regulate the size of DC excitation electric current in the superconducting magnet automatically according to the payload in the electrical network; When electrical network is short-circuited fault, the DC control system of flow restricter identifies the fault of electrical network, and the control superconducting magnet withdraws from excited state, discharges the magnetic energy in the superconducting magnet, and protect dc switch to avoid superpotential threat, make the current limlitings that participate in whole unshakable in one's determination of flow restricter; When electric network fault recovered, the electric current on the superconducting magnet can quickly recover to original level.Compare with saturated core type superconductive current limiter in the past, the saturated core type superconductive failure current limiter with DC control system that the present invention proposes has that volume is little, soon, there are not characteristics such as induction overvoltage threat in current limliting efficient height, recovery characteristics, has the better application prospect.
For reaching above-mentioned purpose, the invention provides a kind of saturated core type superconductive failure current limiter with DC control system, comprise that superconducting magnet, reactance system are iron core and AC Windings, refrigerating system and supervisory control system, it is characterized in that, also comprise a DC control system, this DC control system is connected the superconducting magnet two ends, and is connected by data wire with supervisory control system.
This DC control system comprises:
DC power supplier has output;
Magnetic energy absorbs module, is connected with the DC power supplier output, and it is formed by absorbing branch road and afterflow branch road.Absorb branch road and connect with superconducting magnet, its electric current has one-way; Circuit parallel connection after afterflow branch road and absorption branch road and superconducting magnet is connected, the sense of current is opposite with the absorption branch road;
Control module, it connects the status data line that grid power instrument transformer and DC power supplier and magnetic energy absorb controlled electronic power switch in the module by holding wire, receive electrical measurement signal in the electrical network, and the status signal and the control signal that receive and send controlled power electronic device in the DC control system, the running status of identification electrical network, and the running status of control DC power supplier and magnetic energy absorption module.
DC power supply in the described DC power supplier be single-phase or the three-phase alternating current electric rectification after the DC power supply that provides of the DC power supply exported or dry cell, storage battery.
Comprise one or more controlled electronic power switches in the DC power supply of exporting behind the described single-phase or three-phase alternating current electric rectification, described controlled electronic power switch is realized the controlled and output current constant current scalable of output voltage.
The controlled electronic power switch of route is propped up in described absorption and the magnetic energy absorber element composes in parallel.
Described DC power supplier and magnetic energy absorb electronic power switch in the module be selected from insulated gate bipolar transistor npn npn IGBT, integral gate change type thyristor IGCT, gate level turn-off thyristor GTO one of them.
Magnetic energy absorber element in the described absorption branch road is a kind of or wherein several combination in piezo-resistance, air discharge tube, solid discharging tube or the Transient Voltage Suppressor.
Described afterflow is propped up one or more diode of route and is formed.
Diode in the described afterflow branch road is a fast recovery diode.
For reaching above-mentioned purpose, the present invention also provides a kind of control method with saturated core type superconductive current limiter of DC control system, and the method comprising the steps of:
1) control module is received from the electrical measurement signal of electric power mutual-inductor in the electrical network by processing, identifies the running status of electrical network, and comprise three kinds of running statuses: normal operating condition, the fault that is short-circuited and short trouble return to form;
2) control module is when identifying operation of power networks at normal operating condition, and control magnetic energy absorbs the controlled electronic power switch in the module, makes it be in the state that non-magnetic energy absorbs; Controlled electronic power switch in the control DC power supplier makes it be in the state of low-voltage direct constant current output;
3) when DC power supplier is in the state of low-voltage direct constant current output, control module is according to the size and the network load coupling of electric current in the size adjustment superconducting magnet of network load, get back to step 1) then and keep this circulation always, change up to the running status of electrical network;
4) control module is when identifying electrical network and be in the short trouble state, and control magnetic energy absorbs the controlled electronic power switch in the module, it is in carries out the state that magnetic energy absorbs; The controlled electronic power switch of control DC power supplier makes it interrupt direct current output, gets back to step 1) then and keeps this circulation always, changes up to the running status of electrical network;
5) control module is when identifying electrical network and be in the fault recovery state, and control magnetic energy absorbs controlled electronic power switch in the module, makes it be in the state that non-magnetic energy absorbs; The electronic power switch of control DC power supplier makes it be in the high voltage direct current output state, gets back to step 1) then and keeps this circulation always, changes up to the running status of electrical network.
The present invention has following useful technique effect: the present invention compares with saturated core type superconductive current limiter in the past, the saturated core type superconductive failure current limiter with DC control system that the present invention proposes has that volume is little, soon, there are not characteristics such as induction overvoltage threat in current limliting efficient height, recovery characteristics, has the better application prospect.
Description of drawings
Fig. 1 has the integrated circuit figure of the saturated core type superconductive current limiter of DC control system for the present invention;
Fig. 2 is the circuit theory diagrams of DC control system;
Fig. 3 is the flow chart of steps of the control method of DC control system among the present invention;
Fig. 4 is the circuit diagram of an Application Example of DC control system;
Fig. 5 (a) (b) (c) is the schematic diagram of several Application Examples of absorption branch road.
Symbol description among the figure
1 electrical network
2 superconducting magnets
Load in 3 electrical networks
4 reactance systems (comprising iron core and AC Windings)
5 DC control system
6 supervisory control systems
7 refrigerating systems
8 electric power mutual-inductors
51 DC power supplier
52 magnetic energy absorb module
53 control modules
521 absorb branch road
522 afterflow branch roads
Embodiment
Describe the specific embodiment of the present invention and specific embodiment in detail below in conjunction with accompanying drawing.
As shown in Figure 1, the integrated circuit figure that has the saturated core type superconductive current limiter of DC control system for the present invention, the invention provides a kind of saturated core type superconductive failure current limiter with DC control system, be connected on the electric network source 1, it comprises that superconducting magnet 2, reactance system 4 promptly comprise iron core and AC Windings, refrigerating system 7 and supervisory control system 6, wherein, also comprise a DC control system 5, this DC control system is connected the superconducting magnet two ends, and is connected by data wire with supervisory control system 6.
Shown in the circuit theory diagrams of Fig. 2 DC control system, described DC control system 5 comprises:
Magnetic energy absorbs module 52, is connected with DC power supplier 51 outputs, and it is formed by absorbing branch road 521 and afterflow branch road 522.Absorb branch road 521 and connect with superconducting magnet 2, its electric current has one-way; Circuit parallel connection after afterflow branch road 522 and absorption branch road 521 are connected with superconducting magnet 2, the sense of current is opposite with absorption branch road 521;
As shown in Figure 4, DC power supply in the described DC power supplier 51 be single-phase or the three-phase alternating current electric rectification after the DC power supply exported, use controlled electronic power switch Q1, inductance coil L1, capacitor C 2, diode D2 to realize that output voltage is controlled, and realize the output current constant flow regulation by controlled electronic power switch Q3.When flow restricter normally moved, lower direct voltage of DC power supplier 51 outputs was kept exciting current in the superconducting magnet 2; When flow restricter recovers excited state, export a higher direct current and force voltage, make the magnetic field in the superconducting magnet 2 reach excited state fast.
As shown in Figure 4, described absorption branch road 521 is composed in parallel by controlled electronic power switch Q2 and magnetic energy absorber element Rm.As shown in Figure 5, for absorbing several application examples of circuit 521.Two groups of magnetic energy absorber element Rm are in parallel with controlled electronic power switch Q2 in Fig. 5 (a) expression; Two groups of magnetic energy absorber element Rm are in parallel with two groups of controlled electronic power switch Q2 in Fig. 5 (b) expression; Four groups of magnetic energy absorber element Rm are in parallel with two groups of controlled electronic power switch Q2 in Fig. 5 (c) expression.When superconducting magnet 2 operates in excited state, absorb branch road 521 and show as path, be equivalent to short-circuit condition.When superconducting magnet 2 withdraws from excited state, show as and open circuit, and absorb magnetic energy in the superconducting magnet 2, with the voltage limit at superconducting magnet 2 two ends to lsafety level.
Magnetic energy absorber element Rm in the described absorption branch road 521 is a kind of or wherein several combination in piezo-resistance, air discharge tube, solid discharging tube or the Transient Voltage Suppressor.
Described afterflow branch road 522 is made up of one or more diode.Current direction in the afterflow branch road 522 has one-way, and is opposite with current direction in the superconducting magnet 2.So afterflow branch road 522 is the series, parallel or the multiple combination of connection in series-parallel of one or more diodes, also can be controlled electronic power switch.
In a kind of preferred embodiment, the diode in the described afterflow branch road 522 is a fast recovery diode.
1) control module 53 is received from the electrical measurement signal of electric power mutual-inductor 8 in the electrical network by processing, identifies the running status of electrical network, and this running status comprises normal operating condition, the fault that is short-circuited and short trouble return to form;
2) control module 53 is when identifying operation of power networks at normal operating condition, and control magnetic energy absorbs the controlled electronic power switch in the module 52, makes it be in the state that non-magnetic energy absorbs; Controlled electronic power switch in the control DC power supplier 51 makes it be in the state of low-voltage direct constant current output;
3) when DC power supplier 51 is in the state of low-voltage direct constant current output, control module 53 is according to the size and the network load coupling of electric current in the size adjustment superconducting magnet 2 of network load.Get back to step 1) then and keep this circulation always, change up to the running status of electrical network;
4) control module 53 is when identifying electrical network and be in the short trouble state, and control magnetic energy absorbs the controlled electronic power switch in the module 52, it is in carries out the state that magnetic energy absorbs; The controlled electronic power switch of control DC power supplier 51 makes it interrupt direct current output.Get back to step 1) then and keep this circulation always, change up to the running status of electrical network;
5) control module 53 is when identifying electrical network and be in the fault recovery state, and control magnetic energy absorbs controlled electronic power switch in the module 52, makes it be in the state that non-magnetic energy absorbs; The electronic power switch of control DC power supplier 51 makes it be in the high voltage direct current output state.Get back to step 1) then and keep this circulation always, change up to the running status of electrical network.
Again in conjunction with a specific embodiment, further specify detailed formation, principle and the function of each several part in the DC control system below.
As shown in Figure 4, be the detailed circuit diagram of the DC control system of 35kV superconductive current limiter.DC power supplier 51 is the rectifications of three-phase 380V alternating current process three phase full bridge, and rectification goes out the direct current that voltage is 550V.DC power supplier 51 uses controlled electronic power switch Q1, inductance coil L1, capacitor C 2, diode D2 to control its output voltage, and realizes the electric current constant flow regulation by controlled electronic power switch Q3.
Detailed formation, principle and the function of the DC control system of core type superconductive current limiter of the present invention are as follows:
1) DC power supplier 51
In the present embodiment, single-phase or three-phase alternating current is exported a pulsating direct current by the rectification of electronic power switch pipe, rear end whole filter capacitor C1 in parallel, the harmonic wave of filter out power output.
At the output rear end of DC power supply switching mode BOAST booster circuit of forming by inductance L 1, electronic power switch Q1, diode D2 and filtering energy storage capacitor C 2 etc. in parallel, by PWM pulsewidth modulation power electronic switch Q1, the size of control output voltage realizes voltage controlled.
When flow restricter normally moves, by the duty cycle of switching of PWM pulsewidth modulation power electronic switch Q1, export a lower direct voltage, keep exciting current in the superconducting magnet 2; When flow restricter recovers excited state, by the duty cycle of switching of PWM pulsewidth modulation power electronic switch Q1, export a higher direct current and force voltage, make the magnetic field in the superconducting magnet 2 reach excited state fast.
Electronic power switch Q3 is used to regulate and cut off the output of DC power supply, controls by controller 53.It utilizes the duty cycle of switching of PWM pulse width modulation controlled electronic power switch Q3, regulates the current value in the superconducting magnet 2.
Electronic power switch Q1 and Q3 can be made up of one or more insulated gate bipolar transistor npn npn IGBT, gate level turn-off thyristor GTO or integral gate change type thyristor IGCT connection in series-parallel.
2) magnetic energy absorbs module 52
Magnetic energy absorbs module 52 and forms by absorbing branch road 521 and afterflow branch road 522.Absorb branch road 521 and connect with superconducting magnet 2, its electric current has one-way; Circuit parallel connection after afterflow branch road 522 and absorption branch road 521 are connected with superconducting magnet 2, the sense of current is opposite with absorption branch road 521.
As absorbing shown in branch road 521 parts among Fig. 4, be to form by electronic power switch Q2 piezo-resistance Rm in parallel, be connected on jointly in the loop with superconducting magnet 2.
The set of devices that composes in parallel by electronic power switch Q2 and piezo-resistance Rm wherein, have at least an electronic power switch and piezo-resistance Rm to compose in parallel or a plurality of electronic power switch and piezo-resistance Rm and joint group are in series, as Fig. 5 (a) (b) shown in (c).Absorb a kind of that piezo-resistance Rm in the branch road also can be in the similar devices such as high energy piezo-resistance, air discharge tube, solid discharging tube and Transient Voltage Suppressor TVS.
Shown in afterflow branch road 522 parts among Fig. 4, to form by a diode, it is opposite with current reversal in the superconducting magnet 2, is used for afterflow.
As required, it can be made of a plurality of diode serial or parallel connections or series-parallel comprehensive form.In addition, diode also can use controlled power electronic device to substitute.
When flow restricter withdraws from excited state, the output that the electronic power switch Q3 in the command diagram 4 cuts off the electricity supply, at this moment superconducting magnet 2 forms afterflow by diode D1, Q2.When Q3 turn-offs; turn-off Q2; superconducting magnet 2 two ends can produce one and cut off overvoltage; be added in switch Q2 two ends; at this moment piezo-resistance Rm discharge is carried out clamp to the voltage at superconducting magnet 2 two ends simultaneously; so both discharge the magnetic energy in the superconducting magnet 2, and also protected electronic power switch Q2 to avoid superpotential threat.
3) control module 53
The present invention utilizes the power electronics control technology, makes superconductive current limiter become active flow restricter.When electrical network normally moved, the control module in the DC control system can be regulated the size of DC excitation electric current in the superconducting magnet automatically according to the size of loading in the electrical network; When electrical network was short-circuited fault, control module was initiatively cut off DC loop, simultaneously the magnetic energy in the superconducting magnet is discharged, and overvoltage is carried out strangulation, the current limliting that participates in whole unshakable in one's determination of flow restricter; After the fault of electrical network was eliminated or excised, control module improved electric power output voltage by electronic power switch, forces superconducting magnet to magnetize rapidly, and flow restricter can quickly recover to low resistance state.
Claims (10)
1. saturated core type superconductive failure current limiter with DC control system, comprise that superconducting magnet, reactance system are iron core and AC Windings, refrigerating system and supervisory control system, it is characterized in that, also comprise a DC control system, this DC control system is connected the superconducting magnet two ends, and is connected by data wire with supervisory control system.
2. the saturated core type superconductive failure current limiter with DC control system as claimed in claim 1, wherein, this DC control system comprises:
DC power supplier has output;
Magnetic energy absorbs module, is connected with the DC power supplier output, and it is formed by absorbing branch road and afterflow branch road.Absorb branch road and connect with superconducting magnet, its electric current has one-way; Circuit parallel connection after afterflow branch road and absorption branch road and superconducting magnet is connected, the sense of current is opposite with the absorption branch road;
Control module, it connects the status data line that grid power instrument transformer and DC power supplier and magnetic energy absorb controlled electronic power switch in the module by holding wire, receive the electrical measurement signal of electrical network and control system, the running status of identification electrical network, and the running status of control DC power supplier and magnetic energy absorption module.
3. the saturated core type superconductive failure current limiter with DC control system as claimed in claim 2, wherein, the DC power supply in the described DC power supplier be single-phase or the three-phase alternating current electric rectification after the DC power supply that provides of the DC power supply exported or dry cell, storage battery.
4. the saturated core type superconductive failure current limiter with DC control system as claimed in claim 3, wherein, comprise one or more controlled electronic power switches in the DC power supply of exporting behind the described single-phase or three-phase alternating current electric rectification, described controlled electronic power switch is used to realize the controlled and output current constant current scalable of output voltage.
5. the saturated core type superconductive failure current limiter with DC control system as claimed in claim 2, wherein, the controlled electronic power switch of route is propped up in described absorption and the magnetic energy absorber element composes in parallel.
6. as claim 4 and 5 described saturated core type superconductive failure current limiters with DC control system, wherein, described controlled electronic power switch be selected from insulated gate bipolar transistor npn npn IGBT, integral gate change type thyristor IGCT, gate level turn-off thyristor GTO one of them.
7. the saturated core type superconductive failure current limiter with DC control system as claimed in claim 5, wherein, described magnetic energy absorber element is a kind of or wherein several combination in piezo-resistance, air discharge tube, solid discharging tube or the Transient Voltage Suppressor.
8. the saturated core type superconductive failure current limiter with DC control system as claimed in claim 2, wherein, described afterflow is propped up one or more diode of route and is formed.
9. the saturated core type superconductive failure current limiter with DC control system as claimed in claim 8, wherein, the diode in the described afterflow branch road is a fast recovery diode.
10. the control method with saturated core type superconductive current limiter of DC control system is characterized in that, comprises step:
1) control module identifies the running status of electrical network by handling the electrical measurement signal that receives from electric power mutual-inductor in the electrical network, and comprise three kinds of running statuses: normal operating condition, the fault that is short-circuited and short trouble return to form;
2) control module is when identifying operation of power networks at normal operating condition, and control magnetic energy absorbs the controlled electronic power switch in the module, makes it be in the state that non-magnetic energy absorbs; Controlled electronic power switch in the control DC power supplier makes it be in the state of low-voltage direct constant current output;
3) when DC power supplier is in the state of low-voltage direct constant current output, control module is according to the size and the network load coupling of electric current in the size adjustment superconducting magnet of network load, get back to step 1) then and keep this circulation always, change up to the running status of electrical network;
4) control module is when identifying electrical network and be in the short trouble state, and control magnetic energy absorbs the controlled electronic power switch in the module, it is in carries out the state that magnetic energy absorbs; The controlled electronic power switch of control DC power supplier makes it interrupt direct current output, gets back to step 1) then and keeps this circulation always, changes up to the running status of electrical network;
5) control module is when identifying electrical network and be in the fault recovery state, and control magnetic energy absorbs controlled electronic power switch in the module, makes it be in the state that non-magnetic energy absorbs; The electronic power switch of control DC power supplier makes it be in the high voltage direct current output state, gets back to step 1) then and keeps this circulation always, changes up to the running status of electrical network.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810084283 CN101546908B (en) | 2008-03-28 | 2008-03-28 | Saturated iron core type superconducting current limiter with direct current control system and method for controlling same |
| EP08733988A EP2139088B1 (en) | 2007-04-17 | 2008-04-17 | Core-saturated superconductive fault current limiter and control method of the fault current limiter |
| KR1020097021866A KR101108664B1 (en) | 2007-04-17 | 2008-04-17 | Core-saturated superconductive fault current limiter and control method of the fault current limiter |
| US12/596,645 US8582255B2 (en) | 2007-04-17 | 2008-04-17 | Core-saturated superconductive fault current limiter and control method of the fault current limiter |
| JP2010503337A JP5102872B2 (en) | 2007-04-17 | 2008-04-17 | Saturated core type superconducting fault current limiter and control method of the fault current limiter |
| ES08733988T ES2398259T3 (en) | 2007-04-17 | 2008-04-17 | Loss current limiter superconducting saturated core and loss current limiter control procedure |
| PCT/CN2008/000792 WO2008125022A1 (en) | 2007-04-17 | 2008-04-17 | Core-saturated superconductive fault current limiter and control method of the fault current limiter |
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| CN 200810084283 CN101546908B (en) | 2008-03-28 | 2008-03-28 | Saturated iron core type superconducting current limiter with direct current control system and method for controlling same |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969193A (en) * | 2010-10-28 | 2011-02-09 | 北京云电英纳超导电缆有限公司 | Novel structure of high-voltage superconducting current limiter |
| CN102044865A (en) * | 2009-10-21 | 2011-05-04 | 北京云电英纳超导电缆有限公司 | Saturated core type superconductive current limiter with cable-wound AC winding structure |
| CN102263403A (en) * | 2011-07-22 | 2011-11-30 | 中国科学院电工研究所 | Impedance switching device |
| CN102842402A (en) * | 2011-06-24 | 2012-12-26 | 成功大学 | Magnetizing device |
| CN103368156A (en) * | 2013-08-05 | 2013-10-23 | 北京云电英纳超导电缆有限公司 | Modularized saturation iron core superconductive current limiter and control method thereof |
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