CN103117539B - Self-balanced electromagnetic electronic fault current limiter - Google Patents
Self-balanced electromagnetic electronic fault current limiter Download PDFInfo
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- CN103117539B CN103117539B CN201310075865.XA CN201310075865A CN103117539B CN 103117539 B CN103117539 B CN 103117539B CN 201310075865 A CN201310075865 A CN 201310075865A CN 103117539 B CN103117539 B CN 103117539B
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Abstract
The invention belongs to the field of electric power appliances, particularly relates to a self-balanced electromagnetic electronic fault current limiter, and particularly relates to a device capable of effectively limiting fault current when an alternating-current power system is in short circuit. The self-balanced electromagnetic electronic fault current limiter comprises a current limiting unit and a driving unit; a reactance value is increased by the aid of the current limiting unit when the fault current is generated, and the fault current is limited according to the reactance value; the current limiting unit comprises a current transformer, an electronic power switch element and a resistor R, and the current transformer comprises a closing iron core of an electromagnetic system of the electric appliance, a first winding X1, a second winding X2 and a third winding X3; and the driving unit is connected to the front end of the current limiting unit, and drives the current limiting unit when the fault current flows into the current limiting unit, so that the reactance value can be increased. The self-balanced electromagnetic electronic current limiter has the advantages of simple principle and structure, convenience in control, good current limiting effect, high reliability and the like, and can be applied to a power distribution network.
Description
Technical field
The invention belongs to electric apparatus field, be specifically related to a kind of self-balancing electromagnetic electronic formula fault current limiter, particularly a kind of device of effective fault current limiting when AC power supply system is short-circuited.
Background technology
Due to very harmful to electric power system of short trouble, therefore, domestic and international experts and scholars study each fault current limiter one after another by all means.
The domestic fault current limiter reported is of a great variety at present, comprise isolated form, conducting type, cut-off type, the types such as permanent-magnet bias, such as utility model patent " isolated AC fault current limiter " (inventor: Huang Ruikun, application number: 201120034544.1), utility model patent " conductive alternating-current fault current limiter " (application number: 201120034548.X), and utility model patent " cut-off type AC fault current limiter " (inventor: Huang Ruikun, application number: 201120034545.6) describe isolated AC fault current limiter respectively, conductive alternating-current fault current limiter and cut-off type AC fault current limiter.Also have one section of publication number to be the patent of invention of CN101521373A, disclose a kind of short-circuit current limiting device and method.Its structure is: it comprises magnetic saturation reactor iron core I, II, and magnetic saturation reactor iron core I installs magnetic saturation reactor coil L1 and DC coil L2; Magnetic saturation reactor iron core II installs magnetic saturation reactor coil L3 and DC coil L4; A current transformer, current transformer is side winding L 5 and secondary side winding L6 once; A full bridge rectifier be made up of diode D1, D2, D3, D4, another full bridge rectifier be made up of diode D5, D6, D7, D8; An electric capacity C; A control circuit; A thyristor D9; Two three terminal bidirectional thyristor switch module D10, D11; A resistance R.The fault current limiter that above-mentioned patent is mentioned be by different modes increase power supply input system equivalent internal resistance resist, and then reach the object of fault current limiting, allow the tripper of power-supply system be isolated short trouble smoothly, avoid the influence area of short circuit accident expand and have a power failure for a long time.But such scheme all needs to adopt fuse as tripper, once the fault that is short-circuited, change trouble at high-voltage system after tripper fusing, cause application extremely inconvenient.In addition, tripper (as the fuse) reflection to short trouble is slower, these schemes even adopt more than a tripper, some schemes produce larger impedance on the line when normal operation, such as isolated form flow restricter and conducting type flow restricter, the method that the scheme of conducting type also adopts electric capacity to connect with inductor, be difficult to the Low ESR coupling ensured when normally running equally, high-voltage capacitance is adopted to bring reliability and the bulky problem of complex structure in high-pressure system especially, therefore these scenario-frames are complicated, application is inconvenient, and reliability is not high.
Summary of the invention
Therefore, for above-mentioned problem, the present invention proposes a kind of self-balancing electromagnetic electronic formula fault current limiter (following referred to as fault current limiter), the fuse in existing scheme replaced by employing electronic power switch element, in addition, when circuit normally runs, this fault current limiter does not externally present impedance, and when circuit is short-circuited fault, this fault current limiter can present rapidly the harm that higher resistance causes circuit and equipment with limiting short-circuit current, the tripper of power-supply system is allowed to be isolated short trouble smoothly, the influence area of short circuit accident is avoided to expand and have a power failure for a long time, thus solve the deficiency of prior art.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is, a kind of self-balancing electromagnetic electronic formula fault current limiter, comprises flow-restriction and driver element, described flow-restriction increases reactance value when breaking down electric current, and limits above-mentioned fault current according to this reactance value, this flow-restriction comprises current transformer, electronic power switch element and resistance R, described current transformer is iron core-closed by electrical equipment electromagnetic system, first winding X1, second winding X2 and tertiary winding X3 forms, first winding X1, second winding X2 and tertiary winding X3 be all wound in electrical equipment electromagnetic system iron core-closed on, first winding X1 is identical with the number of turn of the second winding X2, coiling direction is contrary, be wound on the same side that electrical equipment electromagnetic system is iron core-closed, one end of first winding X1 is as the end of incoming cables K1 of this fault current limiter, the other end of the first winding X1 is connected as common port K0 with one end of the second winding X2, the other end of the second winding X2 is as leading-out terminal K2, tertiary winding X3 is wound on the iron core-closed opposite side of electrical equipment electromagnetic system, and the two ends of tertiary winding X3 are connected by resistance R, the first end of described electronic power switch element connects common port K0 and driver element, and the second end of electronic power switch element connects leading-out terminal K2, and the control end of electronic power switch element connects driver element, described driver element is connected to the front end of described flow-restriction, and when flowing into fault current, this drive unit drives flow-restriction makes it increase reactance value.
As a feasible example, described electronic power switch element comprises turn-off thyristor G1 and turn-off thyristor G2, the anode of described turn-off thyristor G1 connects common port K0, the negative electrode of turn-off thyristor G2 and the first control output end of driver element, the negative electrode of turn-off thyristor G1 connects leading-out terminal K2, the anode of turn-off thyristor G2 and the second control output end of driver element, the control end of turn-off thyristor G1 connects the 3rd control output end of driver element, and the control end of turn-off thyristor G2 connects the 4th control output end of driver element.
As the example that another is feasible, described electronic power switch element comprises unidirectional thyristor G3 and unidirectional thyristor G4, the anode of described unidirectional thyristor G3 connects common port K0, the negative electrode of unidirectional thyristor G4 and the first control output end of driver element, the negative electrode of unidirectional thyristor G3 connects leading-out terminal K2, the anode of unidirectional thyristor G4 and the second control output end of driver element, the control end of unidirectional thyristor G3 connects the 3rd control output end of driver element, and the control end of unidirectional thyristor G4 connects the 4th control output end of driver element.
As the example that another is feasible, described electronic power switch element comprises bidirectional thyristor G5, the negative electrode of described bidirectional thyristor G5 connects the first control output end of common port K0 and driver element, the anode of bidirectional thyristor G5 connects leading-out terminal K2, and the control end of bidirectional thyristor G5 connects the second control output end of driver element.
Concrete further, described electrical equipment electromagnetic system is iron core-closed is that rectangle is iron core-closed.
Concrete further, described driver element is by chip microcontroller.Signal is sent into this driver element by current transformer, and driver element carries out process and judges, then drives electronic power switch element movement, makes flow-restriction increase reactance value, and then realizes fault current limiting.
Operation principle of the present invention is as follows: on electrical equipment electromagnetic system is iron core-closed, be wound with three coils being divided into and being designated as the first winding X1, the second winding X2 and tertiary winding X3, first winding X1 and the second winding X2 is two windings of the reverse coiling be connected in main circuit, and tertiary winding X3 is equivalent to the secondary of transformer.The driver element of fault current limiter is by the electric current of current sensor and voltage sensor senses circuit and voltage, when circuit normally runs, because the first winding X1 is with the second winding X2 equal turn numbers and around to contrary, therefore electrical equipment electromagnetic system iron core-closed in magnetic flux be zero, two winding back-emf summations are zero, externally present impedance hardly; When circuit is short-circuited fault; driver element controls electronic power switch element conductive; and by the second winding X2 short circuit; electrical equipment electromagnetic system is iron core-closed is in undersaturated condition; now fault current limiter shows as transformer principle; in main circuit, present induction reactance, limit short circuit current, thus protection circuit and equipment.
Electromagnetic principle combines with power electronic technology by the present invention, propose the concept of self-balancing electromagnetic electronic formula fault current limiter, the scheme that this fault current limiter cut-offs from positive impedance negative impedance of the prior art and tripper is completely different, and tool has the following advantages:
1 fault current limiter three windings (the first winding X1, the second winding X2 and tertiary winding X3) are concentrated be wound on an electrical equipment electromagnetic system iron core-closed on, and the first winding X1 is identical with the number of turn of the second winding X2, coiling direction is contrary, make it externally present the pole Low ESR only having conductor resistance when circuit normally runs, and present by electronic power switch element the harm that high impedance causes equipment with fault current limiting (such as short circuit current) in short trouble generation rear drive unit;
The quick acting of 2 electronic power switch elements ensures quick current-limiting under short trouble state, and current limitation effect is remarkable; After short-circuit current is limited, driver element sends breaking signal to circuit breaker; Cut-off circuit rear drive unit at circuit breaker and turn off the control signal that electronic power switch element conductive is provided, ensure that this fault current limiter automatically resumes operation and protection after failture evacuation;
3 fault current limiters make Current Transformer and electronic power switch element coordinate Current limited Control, and its principle is simple, simple and compact for structure, and control conveniently, and normal operation energy consumption is little, and current limitation effect is good, and reliability is high.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of embodiments of the invention 1;
Fig. 2 is the schematic diagram of embodiments of the invention 2;
Fig. 3 is the schematic diagram of embodiments of the invention 3;
Fig. 4 is application schematic diagram of the present invention.
Embodiment
Now the present invention is further described with embodiment by reference to the accompanying drawings.
A kind of self-balancing electromagnetic electronic formula fault current limiter of the present invention, comprises flow-restriction and driver element; Described flow-restriction increases reactance value when breaking down electric current, and limits above-mentioned fault current according to this reactance value; Described driver element is connected to the front end of described flow-restriction, and when flowing into fault current, this drive unit drives flow-restriction makes it increase reactance value.
embodiment 1
As shown in Figure 1, flow-restriction comprises current transformer, turn-off thyristor G1 and turn-off thyristor G2 and resistance R.Described current transformer is made up of the iron core-closed A of electrical equipment electromagnetic system, the first winding X1, the second winding X2 and tertiary winding X3, first winding X1, the second winding X2 and tertiary winding X3 are all wound on the iron core-closed A of electrical equipment electromagnetic system, first winding X1 is identical with the number of turn of the second winding X2, coiling direction is contrary, one end of first winding X1 is as the end of incoming cables K1 of this fault current limiter, the other end of the first winding X1 is connected as common port K0 with one end of the second winding X2, and the other end of the second winding X2 is as leading-out terminal K2; The two ends of tertiary winding X3 are connected by resistance R.The anode of described turn-off thyristor G1 connects common port K0, the negative electrode of turn-off thyristor G2 and first control output end (the 4th pin) of driver element, the negative electrode of turn-off thyristor G1 connects leading-out terminal K2, the anode of turn-off thyristor G2 and second control output end (the 1st pin) of driver element, the control end I1 of turn-off thyristor G1 connects the 3rd control output end (the 2nd pin) of driver element, and the control end I2 of turn-off thyristor G2 connects the 4th control output end (the 3rd pin) of driver element.
embodiment 2
As shown in Figure 2, flow-restriction comprises current transformer, unidirectional thyristor G3 and unidirectional thyristor G4 and resistance R.Described current transformer is made up of the iron core-closed A of electrical equipment electromagnetic system, the first winding X1, the second winding X2 and tertiary winding X3, first winding X1, the second winding X2 and tertiary winding X3 are all wound on the iron core-closed A of electrical equipment electromagnetic system, first winding X1 is identical with the number of turn of the second winding X2, coiling direction is contrary, one end of first winding X1 is as the end of incoming cables K1 of this fault current limiter, the other end of the first winding X1 is connected as common port K0 with one end of the second winding X2, and the other end of the second winding X2 is as leading-out terminal K2; The two ends of tertiary winding X3 are connected by resistance R.The anode of described unidirectional thyristor G3 connects common port K0, the negative electrode of unidirectional thyristor G4 and first control output end (the 4th pin) of driver element, the negative electrode of unidirectional thyristor G3 connects leading-out terminal K2, the anode of unidirectional thyristor G4 and second control output end (the 1st pin) of driver element, the control end I3 of unidirectional thyristor G3 connects the 3rd control output end (the 2nd pin) of driver element, and the control end I4 of unidirectional thyristor G4 connects the 4th control output end (the 3rd pin) of driver element.
embodiment 3
As shown in Figure 3, flow-restriction comprises current transformer, bidirectional thyristor G5 and resistance R.Described current transformer is made up of the iron core-closed A of electrical equipment electromagnetic system, the first winding X1, the second winding X2 and tertiary winding X3, first winding X1, the second winding X2 and tertiary winding X3 are all wound on the iron core-closed A of electrical equipment electromagnetic system, first winding X1 is identical with the number of turn of the second winding X2, coiling direction is contrary, one end of first winding X1 is as the end of incoming cables K1 of this fault current limiter, the other end of the first winding X1 is connected as common port K0 with one end of the second winding X2, and the other end of the second winding X2 is as leading-out terminal K2; The two ends of tertiary winding X3 are connected by resistance R.The negative electrode of described bidirectional thyristor G5 connects first control output end (the 2nd pin) of common port K0 and driver element, the anode of bidirectional thyristor G5 connects leading-out terminal K2, and the control end I5 of bidirectional thyristor G5 connects second control output end (the 1st pin) of driver element.
In above-described embodiment, the iron core-closed A of described electrical equipment electromagnetic system selects rectangle closed core.
In addition, in above-described embodiment, driver element can by chip microcontroller.Signal is sent into this driver element by current transformer, and driver element carries out process and judges, then drives electronic power switch element movement, makes flow-restriction increase reactance value, and then realizes fault current limiting.
Operation principle of the present invention is as follows: on the iron core-closed A of electrical equipment electromagnetic system, be wound with three coils being divided into and being designated as the first winding X1, the second winding X2 and tertiary winding X3, first winding X1 and the second winding X2 is two windings of the reverse coiling be connected in main circuit, and tertiary winding X3 is equivalent to the secondary of transformer.The driver element of fault current limiter is by the electric current of current sensor and voltage sensor senses circuit and voltage, when circuit normally runs, because the first winding X1 is with the second winding X2 equal turn numbers and around to contrary, therefore the magnetic flux in the iron core-closed A of electrical equipment electromagnetic system is zero, two winding back-emf summations are zero, externally present impedance hardly; When circuit is short-circuited fault; driver element controls electronic power switch element (turn-off thyristor or unidirectional thyristor or bidirectional thyristor) conducting; and by the second winding X2 short circuit; the iron core-closed A of electrical equipment electromagnetic system is in undersaturated condition; now fault current limiter shows as transformer principle; in main circuit, present induction reactance, limit short circuit current, thus protection circuit and equipment.Electromagnetic principle combines with power electronic technology by the present invention, it is made externally to present Low ESR when circuit normally runs, and after short trouble occurs, present the harm that high impedance causes equipment with limiting short-circuit current, have principle simple, it is convenient to control, and normal operation energy consumption is little, current limitation effect is good, the features such as reliability is high, and structure is simple, can be applied in power distribution network.
Fig. 4 is an application example schematic diagram of the present invention, describes the application principle of fault current limiter of the present invention.As shown in Figure 4, the self-balancing electromagnetic electronic formula fault current limiter M(that this Circuits System comprises the present invention's design is abbreviated as fault current limiter M), line voltage sensor PT, line current transducer CT, circuit breaker W and main control computer N.Main circuit end of incoming cables Z receives the end of incoming cables of circuit breaker W, and the leading-out terminal of circuit breaker W connects with the end of incoming cables K1 of fault current limiter M, and the leading-out terminal K2 of fault current limiter M receives the leading-out terminal Y of main circuit.The output of line voltage sensor PT receives the voltage signal inputs of the driver element of fault current limiter M, the output of line current transducer CT receives the current signal input of the driver element of fault current limiter M, the signal constrained input end of the driver element of fault current limiter M receives output and the input of main control computer N respectively, and the break signal output of the driver element of fault current limiter M connects with the release of circuit breaker W.
The driver element of fault current limiter M passes through electric current and the voltage of line current transducer CT and line voltage sensor PT detection line; when circuit is short-circuited fault; fault current limiter M shows as transformer principle; induction reactance is presented in main circuit; thus limit short circuit current; the driver element of fault current limiter M controls circuit breaker trip main circuit, and then realizes the protection to equipment.The driver element of fault current limiter M and main control computer N can carry out two-way communication.
Although specifically show in conjunction with preferred embodiment and describe the present invention; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; can make a variety of changes the present invention in the form and details, be protection scope of the present invention.
Claims (9)
1. a self-balancing electromagnetic electronic formula fault current limiter, is characterized in that:
Comprise flow-restriction and driver element;
Described flow-restriction increases reactance value when breaking down electric current, and limits above-mentioned fault current according to this reactance value, this flow-restriction comprises current transformer, electronic power switch element and resistance R, described current transformer is iron core-closed by electrical equipment electromagnetic system, first winding X1, second winding X2 and tertiary winding X3 forms, first winding X1, second winding X2 and tertiary winding X3 be all wound in electrical equipment electromagnetic system iron core-closed on, first winding X1 is identical with the number of turn of the second winding X2, coiling direction is contrary, be wound on the same side that electrical equipment electromagnetic system is iron core-closed, one end of first winding X1 is as the end of incoming cables K1 of this fault current limiter, the other end of the first winding X1 is connected as common port K0 with one end of the second winding X2, the other end of the second winding X2 is as leading-out terminal K2, tertiary winding X3 is wound on the iron core-closed opposite side of electrical equipment electromagnetic system, and the two ends of tertiary winding X3 are connected by resistance R, the first end of described electronic power switch element connects common port K0 and driver element, and the second end of electronic power switch element connects leading-out terminal K2, and the control end of electronic power switch element connects driver element,
Described driver element is connected to the front end of described flow-restriction, and when flowing into fault current, this drive unit drives flow-restriction makes it increase reactance value;
Described electronic power switch element comprises turn-off thyristor G1 and turn-off thyristor G2, the anode of described turn-off thyristor G1 connects common port K0, the negative electrode of turn-off thyristor G2 and the first control output end of driver element, the negative electrode of turn-off thyristor G1 connects leading-out terminal K2, the anode of turn-off thyristor G2 and the second control output end of driver element, the control end of turn-off thyristor G1 connects the 3rd control output end of driver element, and the control end of turn-off thyristor G2 connects the 4th control output end of driver element.
2. a kind of self-balancing electromagnetic electronic formula fault current limiter according to claim 1, is characterized in that: described electrical equipment electromagnetic system is iron core-closed is that rectangle is iron core-closed.
3. a kind of self-balancing electromagnetic electronic formula fault current limiter according to claim 1, is characterized in that: described driver element is by chip microcontroller.
4. a self-balancing electromagnetic electronic formula fault current limiter, is characterized in that:
Comprise flow-restriction and driver element;
Described flow-restriction increases reactance value when breaking down electric current, and limits above-mentioned fault current according to this reactance value, this flow-restriction comprises current transformer, electronic power switch element and resistance R, described current transformer is iron core-closed by electrical equipment electromagnetic system, first winding X1, second winding X2 and tertiary winding X3 forms, first winding X1, second winding X2 and tertiary winding X3 be all wound in electrical equipment electromagnetic system iron core-closed on, first winding X1 is identical with the number of turn of the second winding X2, coiling direction is contrary, be wound on the same side that electrical equipment electromagnetic system is iron core-closed, one end of first winding X1 is as the end of incoming cables K1 of this fault current limiter, the other end of the first winding X1 is connected as common port K0 with one end of the second winding X2, the other end of the second winding X2 is as leading-out terminal K2, tertiary winding X3 is wound on the iron core-closed opposite side of electrical equipment electromagnetic system, and the two ends of tertiary winding X3 are connected by resistance R, the first end of described electronic power switch element connects common port K0 and driver element, and the second end of electronic power switch element connects leading-out terminal K2, and the control end of electronic power switch element connects driver element,
Described driver element is connected to the front end of described flow-restriction, and when flowing into fault current, this drive unit drives flow-restriction makes it increase reactance value;
Described electronic power switch element comprises unidirectional thyristor G3 and unidirectional thyristor G4, the anode of described unidirectional thyristor G3 connects common port K0, the negative electrode of unidirectional thyristor G4 and the first control output end of driver element, the negative electrode of unidirectional thyristor G3 connects leading-out terminal K2, the anode of unidirectional thyristor G4 and the second control output end of driver element, the control end of unidirectional thyristor G3 connects the 3rd control output end of driver element, and the control end of unidirectional thyristor G4 connects the 4th control output end of driver element.
5. a kind of self-balancing electromagnetic electronic formula fault current limiter according to claim 4, is characterized in that: described electrical equipment electromagnetic system is iron core-closed is that rectangle is iron core-closed.
6. a kind of self-balancing electromagnetic electronic formula fault current limiter according to claim 4, is characterized in that: described driver element is by chip microcontroller.
7. a self-balancing electromagnetic electronic formula fault current limiter, is characterized in that:
Comprise flow-restriction and driver element;
Described flow-restriction increases reactance value when breaking down electric current, and limits above-mentioned fault current according to this reactance value, this flow-restriction comprises current transformer, electronic power switch element and resistance R, described current transformer is iron core-closed by electrical equipment electromagnetic system, first winding X1, second winding X2 and tertiary winding X3 forms, first winding X1, second winding X2 and tertiary winding X3 be all wound in electrical equipment electromagnetic system iron core-closed on, first winding X1 is identical with the number of turn of the second winding X2, coiling direction is contrary, be wound on the same side that electrical equipment electromagnetic system is iron core-closed, one end of first winding X1 is as the end of incoming cables K1 of this fault current limiter, the other end of the first winding X1 is connected as common port K0 with one end of the second winding X2, the other end of the second winding X2 is as leading-out terminal K2, tertiary winding X3 is wound on the iron core-closed opposite side of electrical equipment electromagnetic system, and the two ends of tertiary winding X3 are connected by resistance R, the first end of described electronic power switch element connects common port K0 and driver element, and the second end of electronic power switch element connects leading-out terminal K2, and the control end of electronic power switch element connects driver element,
Described driver element is connected to the front end of described flow-restriction, and when flowing into fault current, this drive unit drives flow-restriction makes it increase reactance value;
Described electronic power switch element comprises bidirectional thyristor G5, the negative electrode of described bidirectional thyristor G5 connects the first control output end of common port K0 and driver element, the anode of bidirectional thyristor G5 connects leading-out terminal K2, and the control end of bidirectional thyristor G5 connects the second control output end of driver element.
8. a kind of self-balancing electromagnetic electronic formula fault current limiter according to claim 7, is characterized in that: described electrical equipment electromagnetic system is iron core-closed is that rectangle is iron core-closed.
9. a kind of self-balancing electromagnetic electronic formula fault current limiter according to claim 7, is characterized in that: described driver element is by chip microcontroller.
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| CN201310075865.XA CN103117539B (en) | 2013-03-11 | 2013-03-11 | Self-balanced electromagnetic electronic fault current limiter |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5650901A (en) * | 1995-05-12 | 1997-07-22 | Mitsubishi Denki Kabushiki Kaisha | Curcuit breaker and circuit breaking apparatus |
| CN101521373A (en) * | 2008-11-27 | 2009-09-02 | 李晓明 | Device and method for limiting short-circuit current |
| CN102035454A (en) * | 2011-01-05 | 2011-04-27 | 山东大学 | Controllable saturable reactor and control method thereof |
| CN203135428U (en) * | 2013-03-11 | 2013-08-14 | 厦门理工学院 | Self-balanced electromagnetic and electronic fault current limiter |
-
2013
- 2013-03-11 CN CN201310075865.XA patent/CN103117539B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5650901A (en) * | 1995-05-12 | 1997-07-22 | Mitsubishi Denki Kabushiki Kaisha | Curcuit breaker and circuit breaking apparatus |
| CN101521373A (en) * | 2008-11-27 | 2009-09-02 | 李晓明 | Device and method for limiting short-circuit current |
| CN102035454A (en) * | 2011-01-05 | 2011-04-27 | 山东大学 | Controllable saturable reactor and control method thereof |
| CN203135428U (en) * | 2013-03-11 | 2013-08-14 | 厦门理工学院 | Self-balanced electromagnetic and electronic fault current limiter |
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| CN103117539A (en) | 2013-05-22 |
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