CN1599184A - Trigger impulse control system of bridge superconducting current limitter - Google Patents
Trigger impulse control system of bridge superconducting current limitter Download PDFInfo
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- CN1599184A CN1599184A CNA2004100203341A CN200410020334A CN1599184A CN 1599184 A CN1599184 A CN 1599184A CN A2004100203341 A CNA2004100203341 A CN A2004100203341A CN 200410020334 A CN200410020334 A CN 200410020334A CN 1599184 A CN1599184 A CN 1599184A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention is a trigger pulse control system of the bridge type superconducting current limiter. It reshapes and transforms the collecting signal of the voltage and the current, send it to the impulse treating circuit after being treated by the central data processing circuit and reach the aim of controlling the trigger pulse needed by the insulated gate ambipolar thyristor element circuit. The advantages and the technological effects of the invention lie in the following aspects: making use of the monolithic processor chip with high handling capacity to control the trigger pulse of the bridge type superconducting current limiter increases the speed and the treating precision of the data collecting greatly, makes the whole control system posses pretty good adjusting property and reliability, increases the stability of the electric power, guarantees the protection when there is something wrong with the power transmission line better and decreases the probability of large-scale power failure.
Description
(1) technical field:
The invention belongs to electric power system bridge type superconductive flow restricter control technology field, particularly a kind of bridge type superconductive flow restricter trigger impulse control system based on singlechip technology.
(2) background technology:
Along with the continuous expansion of electric power system scale, when line failure, can current-limiting apparatus move quickly and effectively becomes one of hot technology of stakeholder's concern.Weigh the characteristics of various flow restricters, the high-power electric and electronic switch strengthens reactance type flow restricter and is subjected to favor more, and be example with the bridge circuit type superconducting fault current limiter: said bridge circuit type superconducting fault current limiter (claiming bridge type superconductive failure current limiter again) is taken the formation bridge circuit by GTO (turn-off thyristor) or IGBT device for high-power power electronic such as (insulated gate bipolar thyristors) usually; Because it is very high that high-power circuit requires trigger impulse, therefore require control system will possess the characteristics of accurate acquired signal, accurately processing, strict control.Multiple pulse control technique appearred in the past, but these technology or only paid attention to data-handling capacity and ignore acquisition speed, otherwise having improved acquisition speed has but reduced data-handling capacity; In addition, consider seldom especially for anti-interference aspect.Along with the fast development of power industry, the increase day by day of distribution system capacity and scale, traditional control technology more and more is difficult to satisfy the performance requirement of modern industry.So the weak point of improving conventional art has become most important with stability and the reliability that improves the required trigger impulse of fault current limiter.
(3) summary of the invention:
The object of the present invention is to provide a kind of bridge type superconductive flow restricter trigger impulse control system, it is in conjunction with high performance signal processor and flexible control technique, can obtain high-precision control effect, the stability and the reliability of bridge type superconductive flow restricter have been improved greatly, and, guaranteed the stable operation of relevant power equipment, circuit from having reduced the loss that short circuit malfunction brings to the full extent.
Technical scheme of the present invention: a kind of bridge type superconductive flow restricter trigger impulse control system is characterized in that this control system is made up of alternating current sampling circuit, central processing circuit and pulse processing circuit; The input of said alternating current sampling circuit is connected with outside bridge type superconductive flow restricter major loop, its output connects the input of central data treatment circuit, the output of central processing circuit connects pulse processing circuit, and the output of pulse processing circuit connects the gate pole input of each insulated gate bipolar thyristor of bridge-type superconductive current limiter.
Above-mentioned said alternating current sampling circuit is made up of AC sampling front-end circuit, A/D change-over circuit and frequency square wave translation circuit; The AC sampling front-end circuit is sent voltage, the current signal gathered into A/D modular converter input in the central data treatment circuit; Frequency square wave translation circuit is transformed to the sine voltage signal of gathering the capture module that is input to behind the square-wave signal in the central data treatment circuit.
Above-mentioned said AC sampling front-end circuit comprises voltage collection circuit and current acquisition circuit two parts, gathers voltage signal and current signal in the circuit respectively.
Above-mentioned said voltage collection circuit constitutes the input saturation protection by D11, D12, constitutes instrument transformer phase shift compensation and rc filter circuit with R24, R25, R26, C11, C12; This circuit is enlarged into the voltage signal of gathering-5V～+ voltage of 5V, after the one-level amplifier is isolated, send into the built-in A/D module of single-chip microcomputer input port analog signal is carried out digitized processing, the digital quantity signal of conversion gained enters pulse width modulation module, with pending compensation data and further processing; Frequency square wave translation circuit is transformed to the sine voltage signal of gathering the capture module that is input to behind the square-wave signal in the central data treatment circuit in addition; Above-mentioned said current acquisition circuit constitutes the input saturation protection by D21, D22, constitutes instrument transformer phase shift compensation and rc filter circuit with R34, R35, R36, C16, C17; This circuit is enlarged into the current signal of gathering-5V～+ voltage of 5V, after the one-level amplifier is isolated, send into the built-in A/D module of single-chip microcomputer input port analog signal is carried out digitized processing, the digital quantity signal of conversion gained enters pulse width modulation module, with pending compensation data and further processing.
Above-mentioned said frequency square wave translation circuit constitutes the hysteresis voltage comparator with R1, R2, R4, R5 and comparator LM339, constitutes bleeder circuit with R7, R8, and the capture module of sending in the central data treatment circuit after the signal processing of gathering is sampled.
Above-mentioned said central processing circuit comprises 8 singlechip chips, power management module, crystal oscillating circuit, photoelectric isolating circuit and power driving circuits; Set monolithic processor controlled executive condition by writing software program, to the identification of acquired signal, handle and send control command; Wherein power module provides electric energy to supply with; Crystal oscillating circuit then provides clock signal to singlechip chip.
Above-mentioned said singlechip chip comprises big capacity flash memory, 8 tunnel 10 multiple interfaces such as A/D converter, 8 pulse-width modulation delivery outlets of two-way and monitor; Power management module is made of power supply device and peripheral resistance R 15, R16, C1, C2 electric capacity; Crystal oscillating circuit is made of the capacitor C 3 that clock signal is provided to singlechip chip, C4, C5, C6 and two crystal oscillator body U2.
Above-mentioned said pulse processing circuit comprises pulse amplification, control circuit and power driving circuit two parts; The three-phase pulse amplifying circuit is made of diode, resistance, triode; Power driving circuit amplifies the input pulse signal through triode, offer superconductive current limiter insulated gate bipolar thyristor element circuit, and superconductive current limiter is controlled; One of said three-phase pulse amplifying circuit comprises the amplifying circuit of amplification "+A1 " pulse mutually, contain diode D1, resistance, photoelectricity coupling unit U9 and triode N1, amplify the amplifying circuit of " A1 " pulse, comprise diode D2, resistance, photoelectricity coupling unit U10 and triode N2, amplify the amplifying circuit of "+A2 " pulse, comprise diode D3, resistance, photoelectricity coupling unit U11 and triode N3, amplify the amplifying circuit of " A2 " pulse, comprise diode D4, resistance, photoelectricity coupling unit U12 and triode N4; In like manner, other two-phase also comprises 4 insulated gate bipolar thyristor unit respectively, and three-phase amounts to 12.
Above-mentioned said superconductive current limiter insulated gate bipolar thyristor element circuit comprises: 4 insulated gate bipolar thyristor unit in the single phase alternating current (A.C.) loop, and three-phase amounts to 12 insulated gate bipolar thyristor unit; Their control impuls is from pulse amplifying circuit.
Operation principle of the present invention:
Its operation principle of superconductive current limiter insulated gate bipolar thyristor (IGBT) element circuit that this case is controlled is determined by the bridge circuit type superconducting flow restricter.The main effect of superconducting coil L in the bridge circuit type superconducting flow restricter provides bias current and limiting short-circuit current.Dc bias power V provides bias current i for superconducting coil L
L, regulate its size, make i under the normal operating conditions
AL(is example mutually with A) is greater than circuit normal current i
AcPeak value; Regulate trigger angle simultaneously and make bridge circuit be similar to diode bridge, and conducting all the time.This moment, superconducting coil was in superconducting state, and impedance is very little, and whole flow restricter has on bridge circuit the little forward voltage drop, and system does not show any impedance.Under fault state, work as i
AcWhen amplitude increases to set point, at i
AcIn the positive and negative half cycle, regulate the trigger angle of relevant IGBT (insulated gate bipolar thyristor), make superconducting coil L seal in circuit, fault current is just limited by the big inductance of superconducting coil L; Change trigger angle simultaneously and make bridge circuit work in inverter mode, will make the magnetic energy of big inductance in the superconductive current limiter feed back to electrical network, the protection relevant device.
The operation principle of the bridge type superconductive flow restricter trigger impulse control system that this case is adopted is: alternating current sampling circuit is transformed to transmission line voltage transformer secondary side voltage and current sensors secondary side current than the low amplitude value alternating voltage, and analog signals becomes digital quantity signal through the built-in A/D module of single-chip microcomputer and sends into and carry out signal processing in the central processing circuit; During operate as normal, the control trigger angle makes IGBT (insulated gate bipolar thyristor) bridge circuit be similar to diode bridge work; When line failure makes electric current increase to the setting limit value; central processing circuit calculates the trigger angle of power circuit according to selected control law according to input variable; pulse is sent in time-delay; after amplifying, triggers by the pulse amplifying circuit relevant IGBT (insulated gate bipolar thyristor); by the big inductance containment of superconduct sensor short circuit current; and by control trigger angle make bridge circuit be in inverter mode; satisfy the needs of relay protection of power system; relevant power equipment of protection and circuit, and help reclosing operation.
Superiority of the present invention and technique effect are: utilize the chip with high throughput to realize the control of bridge circuit formula superconductive current limiter; acquisition speed and processing accuracy have been improved to a great extent; make The whole control system have good adjusting function and reliability; strengthened the stability of electrical network; protection action when having guaranteed transmission line malfunction preferably, the probability of reduction large area blackout.The control system that adopts singlechip chip to form, its hardware circuit are simple and easy to understand, the output trigger impulse is safe and reliable, precision of real time control is high, can be bigger the stability and the reliability of raising system.Singlechip technology is applied in the bridge type superconductive flow restricter, the electronic switch of IGBT compositions such as (insulated gate bipolar thyristors) is carried out closed-loop control, can give full play to the strong control ability and the high accuracy data disposal ability of single-chip microcomputer.Add peculiar advantages such as bridge circuit formula superconductive current limiter does not have big electric current A.C.power loss, does not have core device, is suitable for automatic reclosing, the operating current value is controlled, this superconductive current limiter control system has broad application prospects.
(4) description of drawings:
Accompanying drawing 1 is the unit overall circuit structural representation among the present invention's related " bridge type superconductive flow restricter trigger impulse control system ".
Accompanying drawing 2 is the alternating current sampling circuit schematic diagram among the present invention's related " bridge type superconductive flow restricter trigger impulse control system ".
Accompanying drawing 3 is the central processing circuit structural representation among the present invention's related " bridge type superconductive flow restricter trigger impulse control system ".
Accompanying drawing 4 is the pulse processing circuit structural representation among the present invention's related " bridge type superconductive flow restricter trigger impulse control system ".
Accompanying drawing 5 is the present invention's's related " bridge type superconductive flow restricter trigger impulse control system " controlling object electrical block diagram.
(5) embodiment:
Embodiment 1: a kind of bridge type superconductive flow restricter trigger impulse control system (see figure 1), it is characterized in that it with Dutch PHILIPS company the state-of-the-art technology product--8 single-chip microcomputer 80C552 are central processing unit, and whole system is made up of alternating current sampling circuit, central processing circuit and pulse processing circuit; The input of said alternating current sampling circuit connects external voltage instrument transformer summation current transformer, its output connects the input of central data treatment circuit, the output of central processing circuit connects pulse processing circuit pulse amplifier section respectively, the output of pulse amplifying circuit connects power driving circuit, and the output of power driving circuit connects the gate pole input of each insulated gate bipolar thyristor of bridge-type superconductive current limiter.
Above-mentioned said alternating current sampling circuit (is seen Fig. 2-a, Fig. 2-b) be made up of AC sampling front-end circuit, A/D change-over circuit and frequency square wave translation circuit; The AC sampling front-end circuit is sent voltage, the current signal gathered into A/D modular converter input in the central data treatment circuit; Frequency square wave translation circuit is transformed to the sine voltage signal of gathering the capture module that is input to behind the square-wave signal in the central data treatment circuit.
Above-mentioned said AC sampling front-end circuit comprises voltage collection circuit and current acquisition circuit two parts, gathers voltage signal and current signal in the circuit respectively.
Above-mentioned said voltage collection circuit (sees that Fig. 2-a) constitutes the input saturation protection by D11, D12, constitutes instrument transformer phase shift compensation and rc filter circuit with R24, R25, R26, C11, C12; This circuit is enlarged into the voltage signal of gathering-5V～+ voltage of 5V, after the one-level amplifier is isolated, send into the built-in A/D module of single-chip microcomputer input port analog signal is carried out digitized processing, the digital quantity signal of conversion gained enters pulse width modulation module, with pending compensation data and further processing; Frequency square wave translation circuit is transformed to the sine voltage signal of gathering the capture module that is input to behind the square-wave signal in the central data treatment circuit in addition; Above-mentioned said current acquisition circuit constitutes the input saturation protection by D21, D22, constitutes instrument transformer phase shift compensation and rc filter circuit with R34, R35, R36, C16, C17; This circuit is enlarged into the current signal of gathering-5V～+ voltage of 5V, after the one-level amplifier is isolated, send into the built-in A/D module of single-chip microcomputer input port analog signal is carried out digitized processing, the digital quantity signal of conversion gained enters pulse width modulation module, with pending compensation data and further processing.
Above-mentioned said frequency square wave translation circuit (sees that Fig. 2-b) constitutes the hysteresis voltage comparator with R1, R2, R4, R5 and comparator LM339, constitute bleeder circuit with R7, R8, the capture module of sending in the central data treatment circuit after the signal processing of gathering is sampled.
Above-mentioned said central processing circuit (see figure 3) comprises 8 singlechip chips, power management module, crystal oscillating circuit, photoelectric isolating circuit and power driving circuits; Set monolithic processor controlled executive condition by writing software program, to the identification of acquired signal, handle and send control command; Wherein power module provides electric energy to supply with; Crystal oscillating circuit then provides clock signal to singlechip chip.
Above-mentioned said singlechip chip comprises big capacity flash memory, 8 tunnel 10 multiple interfaces such as A/D converter, 8 PWM (pulse-width modulation) delivery outlets of two-way and monitor; Power management module is made of power supply device and peripheral resistance R 15, R16, C1, C2 electric capacity; Crystal oscillating circuit is made of the capacitor C 3 that clock signal is provided to singlechip chip, C4, C5, C6 and two crystal oscillator body U2; This circuit working process is: after the digital quantity that A/D is transformed gained receives the single-chip microcomputer kernel, to data compensate, behind the digital filtering, corresponding corresponding standard value is converted into per unit value, computing draws pilot angle, and conversion count value, living 4 the different control impuls of common property (+A1 ,-A1 ,+A2 ,-A2), three-phase then amounts to 12 different control impuls.
Above-mentioned said above-mentioned said pulse processing circuit comprises pulse amplification, control circuit and power driving circuit two parts (see figure 4); The three-phase pulse amplifying circuit is made of diode, resistance, triode; Power driving circuit amplifies the input pulse signal through triode, offer superconductive current limiter insulated gate bipolar thyristor element circuit, and superconductive current limiter is controlled; One of said three-phase pulse amplifying circuit comprises the amplifying circuit of amplification "+A1 " pulse mutually, contain diode D1, resistance, photoelectricity coupling unit U9 and triode N1, amplify the amplifying circuit of " A1 " pulse, comprise diode D2, resistance, photoelectricity coupling unit U10 and triode N2, amplify the amplifying circuit of "+A2 " pulse, comprise diode D3, resistance, photoelectricity coupling unit U11 and triode N3, amplify the amplifying circuit of " A2 " pulse, comprise diode D4, resistance, photoelectricity coupling unit U12 and triode N4; In like manner, other two-phase also comprises 4 IGBT (insulated gate bipolar thyristor) unit respectively, and three-phase amounts to 12; This circuit working process is: totally 4 (three-phase amounts to 12) control impuls that this pulse amplifying circuit is exported two singlechip chips (+A1 ,-A1 ,+A2 ,-A2) amplify, so that trigger IGBT (insulated gate bipolar thyristor) unit of back reliably; The effect of diode D1, D2, D3 and D4 is to prevent the pulse reverse input, avoids interference the operate as normal of singlechip chip.
Above-mentioned said superconductive current limiter insulated gate bipolar thyristor element circuit (sees that Fig. 5-a, Fig. 5-b) comprise that (see 4 IGBT (insulated gate bipolar thyristor) unit among Fig. 5-a), three-phase amounts to 12 IGBT (insulated gate bipolar thyristor) unit and (sees Fig. 5-b) in the single phase alternating current (A.C.) loop; Their control impuls is from process power driving circuit processing and amplifying signal later; This circuit working process is: 4 IGBT (insulated gate bipolar thyristor) unit in the superconductive current limiter insulated gate bipolar thyristor element circuit (three-phase amounts to 12) T1, T2, T3 and T4, and the signal that receives from pulse amplifying circuit according to certain time sequence is triggered; During operate as normal, the similar diode bridge of bridge circuit conducting; After the fault that is short-circuited, regulate the trigger angle of relevant IGBT (insulated gate bipolar thyristor), make superconducting coil L seal in circuit, fault current is just limited by the big inductance of superconducting coil L; Change trigger angle simultaneously and make bridge circuit work in inverter mode, will make the magnetic energy of big inductance in the superconductive current limiter feed back to electrical network, the protection relevant device.
Claims (9)
1, a kind of bridge type superconductive flow restricter trigger impulse control system is characterized in that this control system is made up of alternating current sampling circuit, central processing circuit and pulse processing circuit; The input of said alternating current sampling circuit is connected with outside bridge type superconductive flow restricter major loop, its output connects the input of central data treatment circuit, the output of central processing circuit connects pulse processing circuit, and the output of pulse processing circuit connects the gate pole input of each insulated gate bipolar thyristor of bridge-type superconductive current limiter.
2,, it is characterized in that alternating current sampling circuit is made up of AC sampling front-end circuit, A/D change-over circuit and frequency square wave translation circuit according to the said a kind of bridge type superconductive flow restricter trigger impulse control system of claim 1; The AC sampling front-end circuit is sent voltage, the current signal gathered into A/D modular converter input in the central data treatment circuit; Frequency square wave translation circuit is transformed to the sine voltage signal of gathering the capture module that is input to behind the square-wave signal in the central data treatment circuit.
3, according to the said a kind of bridge type superconductive flow restricter trigger impulse control system of claim 2, it is characterized in that the AC sampling front-end circuit comprises voltage collection circuit and current acquisition circuit two parts, gathers voltage signal and current signal in the circuit respectively.
4, according to the said a kind of bridge type superconductive flow restricter trigger impulse control system of claim 3, it is characterized in that voltage collection circuit constitutes the input saturation protection by D11, D12, constitutes instrument transformer phase shift compensation and rc filter circuit with R24, R25, R26, C11, C12; This circuit is enlarged into the voltage signal of gathering-5V～+ voltage of 5V, after the one-level amplifier is isolated, send into the built-in A/D module of single-chip microcomputer input port analog signal is carried out digitized processing, the digital quantity of conversion gained enters pulse width modulation module, with pending compensation data and further processing; Frequency square wave translation circuit is transformed to the sine voltage signal of gathering the capture module that is input to behind the square-wave signal in the central data treatment circuit in addition; Above-mentioned said current acquisition circuit constitutes the input saturation protection by D21, D22, constitutes instrument transformer phase shift compensation and rc filter circuit with R34, R35, R36, C16, C17; This circuit is enlarged into the current signal of gathering-5V～+ voltage of 5V, after the one-level amplifier is isolated, send into the built-in A/D module of single-chip microcomputer input port analog signal is carried out digitized processing, the digital quantity of conversion gained enters pulse width modulation module, with pending compensation data and further processing.
5, according to the said a kind of bridge type superconductive flow restricter trigger impulse control system of claim 2, it is characterized in that said frequency square wave translation circuit constitutes the hysteresis voltage comparator with R1, R2, R4, R5 and comparator LM339, constitute bleeder circuit with R7, R8, the capture module of sending in the central data treatment circuit after the signal processing of gathering is sampled.
6, according to the said a kind of bridge type superconductive flow restricter trigger impulse control system of claim 1, it is characterized in that said central data treatment circuit comprises 8 singlechip chips, power management module, crystal oscillating circuit, photoelectric isolating circuit and power driving circuits; Set monolithic processor controlled executive condition, identification, processing and the control command of being sent by writing software program to acquired signal; Wherein power module provides electric energy to supply with; Crystal oscillating circuit then provides clock signal to singlechip chip.
7,, it is characterized in that said singlechip chip comprises big capacity flash memory, 8 tunnel 10 multiple interfaces such as A/D converter, 8 pulse-width modulation delivery outlets of two-way and monitor according to the said a kind of bridge type superconductive flow restricter trigger impulse control system of claim 6; Power management module is made of power supply device and peripheral resistance R 15, R16, C1, C2 electric capacity; Crystal oscillating circuit is made of the capacitor C 3 that clock signal is provided to singlechip chip, C4, C5, C6 and two crystal oscillator body U2.
8, according to the said a kind of bridge type superconductive flow restricter trigger impulse control system of claim 1, it is characterized in that said pulse processing circuit comprises pulse amplification control circuit and power driving circuit two parts; Said pulse amplifying circuit is made of diode, resistance, triode; Power driving circuit amplifies the input pulse signal through triode, offer superconductive current limiter insulated gate bipolar thyristor element circuit, and superconductive current limiter is controlled; Said pulse amplifying circuit comprises the amplifying circuit of amplification "+A1 " pulse, contains diode D1, resistance, photoelectricity coupling unit U9 and triode N1; Amplify the amplifying circuit of " A1 " pulse, comprise diode D2, resistance, photoelectricity coupling unit U10 and triode N2; The amplifying circuit that amplifies "+A2 " pulse comprises diode D3, resistance, photoelectricity coupling unit U1 1 and triode N3; The amplifying circuit that amplifies " A2 " pulse comprises diode D4, resistance, photoelectricity coupling unit U12 and triode N4; Two-phase also comprises 4 insulated gate bipolar thyristor unit respectively in addition, totally 12 of three-phases.
9, according to the said a kind of bridge type superconductive flow restricter trigger impulse control system of claim 1, it is characterized in that said superconductive current limiter insulated gate bipolar thyristor element circuit comprises 4 insulated gate bipolar thyristor unit in the single phase alternating current (A.C.) loop, amount to 12 insulated gate bipolar thyristor unit; Their control impuls is from pulse amplifying circuit.
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| CNA2004100203341A CN1599184A (en) | 2004-08-20 | 2004-08-20 | Trigger impulse control system of bridge superconducting current limitter |
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| CNA2004100203341A CN1599184A (en) | 2004-08-20 | 2004-08-20 | Trigger impulse control system of bridge superconducting current limitter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427962C (en) * | 2005-12-12 | 2008-10-22 | 天津理工大学 | System for detecting fault of currect limiter with non-conduction type superconduction fault and detecting method thereof |
| CN101645598A (en) * | 2008-08-07 | 2010-02-10 | 罗伯特.博世有限公司 | Method and device for protecting electronic component |
| CN113555860A (en) * | 2021-07-28 | 2021-10-26 | 国网甘肃省电力公司 | Improved bridge type superconducting fault current limiter and resistance value adjusting method thereof |
-
2004
- 2004-08-20 CN CNA2004100203341A patent/CN1599184A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427962C (en) * | 2005-12-12 | 2008-10-22 | 天津理工大学 | System for detecting fault of currect limiter with non-conduction type superconduction fault and detecting method thereof |
| CN101645598A (en) * | 2008-08-07 | 2010-02-10 | 罗伯特.博世有限公司 | Method and device for protecting electronic component |
| CN113555860A (en) * | 2021-07-28 | 2021-10-26 | 国网甘肃省电力公司 | Improved bridge type superconducting fault current limiter and resistance value adjusting method thereof |
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