CN102005749B - Current limiting device with flexible switch characteristic and current limiting method - Google Patents
Current limiting device with flexible switch characteristic and current limiting method Download PDFInfo
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- CN102005749B CN102005749B CN 201010575392 CN201010575392A CN102005749B CN 102005749 B CN102005749 B CN 102005749B CN 201010575392 CN201010575392 CN 201010575392 CN 201010575392 A CN201010575392 A CN 201010575392A CN 102005749 B CN102005749 B CN 102005749B
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Abstract
The invention discloses a current limiting device with flexible switch characteristic and a current limiting method. The current limiting device can decrease and nearly turn off the normal load current and the short-circuit current when control equipment gives a disconnection command and can connect the normal load when the control equipment gives a connection command so that the user can use electricity normally and the performance-price ratio is relatively high. The current limiting device comprises magnetic saturable reactor iron cores I and II, a magnetic saturable reactor coil L1 and a direct-current coil L2 which are arranged on the magnetic saturable reactor iron core I, a magnetic saturable reactor coil L3 and a direct-current coil L4 which are arranged on the magnetic saturable reactor iron core II, a full bridge rectification circuit composed of diodes D1, D2, D3 and D4, two diodes D5 and D7, a thyrister D6, a control circuit, a capacitor C, and two resistors R1 and R2.
Description
Technical field
The present invention relates to electric power system and send the power transformation technical field, particularly a kind of current limiting device and method with flexible switch characteristic.
Background technology
Along with the continuous development of electric power system, the continuous rising of generate output, the electric power system short circuit current that causes that is short-circuited is very big.The be short-circuited short circuit current that causes of electric power system is very big to the harm of electric power system.When protective relaying device is short-circuited in electric power system, send trip signal, make circuit breaker trip, cutting-off of short-circuit electric current.The system limited in one's ability of circuit breaker cutting-off of short-circuit electric current, short circuit current surpass when circuit breaker is maximum to cut off current value, and circuit breaker can't cutting-off of short-circuit electric current.Therefore, reduce short circuit current, make the circuit breaker can cutting-off of short-circuit electric current, can reduce the extent of damage of power equipment when short circuit, improve the stability of electric power system.
The method and apparatus of Recent study limiting short-circuit current (also claiming demand limiter) becomes heat subject.
Utilize superconductor to constitute demand limiter.Superconductor presents zero resistance when flowing through the normal duty electric current; The demand limiter that is connected in the transmission line does not influence normal transmission of electricity.When electric power system was short-circuited, superconductor flow through very big electric current, and superconductor presents big resistance; The demand limiter that is connected in the transmission line provides constraints to short circuit current, reduces short circuit current.The shortcoming that superconductor constitutes demand limiter is: mechanism's complexity, expensive, the superconductor technology is immature, the heat dissipation problem when superconductor presents big resistance.
Utilize the series resonance principle to constitute demand limiter.When inductance coil and capacitor series resonance, present small resistor; The demand limiter that is connected in the transmission line does not influence normal transmission of electricity.When electric power system was short-circuited, control module measured short circuit current, and control is parallel to the valve thyristor conducting at capacitor two ends; Capacitor lost efficacy; The inductance coil that is connected in the transmission line provides constraints to short circuit current, reduces short circuit current.The shortcoming that the series resonance principle constitutes demand limiter is: must bulky capacitor group, and the operation maintenance difficulty, what expensive, short circuit current also can not restriction is very little.
Utilize the saturation characteristic of magnetic saturation reactor iron core to constitute demand limiter.Increase by one group of dc coil at the magnetic saturation reactor iron core, when electric power system normally moved, DC power supply provided direct current to dc coil, made the iron core degree of depth of magnetic saturation reactor saturated.When the iron core degree of depth of magnetic saturation reactor was saturated, magnetic saturation reactor presented little reactance; The demand limiter that is connected in the transmission line does not influence normal transmission of electricity.When electric power system was short-circuited, control module was cut off the direct current of dc coil, and the iron core of magnetic saturation reactor breaks away from saturated; Magnetic saturation reactor presents very big reactance.The magnetic saturation reactor that is connected in the transmission line provides constraints to short circuit current, reduces short circuit current.The shortcoming of existing magnetic saturation reactor demand limiter is: the circuit complexity that direct current is provided to dc coil; The effect of limiting short-circuit current is limited; Has only the limiting short-circuit current effect, function singleness; Cost performance is not high; Etc..
Existing demand limiter is main purpose with simple limiting short-circuit current, the confined weak effect of short circuit current, and utilance is low, and the sexual valence ratio is difficult to apply.
Summary of the invention
Purpose of the present invention is exactly in order to address the above problem, a kind of current limiting device and method with flexible switch characteristic is provided, this control appliance sends can reduce normal duty electric current and extremely almost shutoff of short circuit current when cutting off order, control appliance sends when opening order can connect normal load, normally electricity consumption of user, the current limiting device that cost performance is high and method.
For achieving the above object, the present invention adopts following technical scheme:
A kind of current limiting device with flexible switch characteristic, it comprises:
Magnetic saturation reactor iron core I and magnetic saturation reactor iron core II are equipped with magnetic saturation reactor coil L1 and dc coil L2 at magnetic saturation reactor iron core I; At magnetic saturation reactor iron core II magnetic saturation reactor coil L3 and dc coil L4 are installed; Wherein magnetic saturation reactor coil L1 one end is connected with magnetic saturation reactor coil L3 one end, and dc coil L2 one end is connected with dc coil L4 one end; The magnetic saturation reactor coil L1 other end is connected with input terminal;
A rectification circuit that is constituted by a diode; Two inputs of rectification circuit are connected with lead-out terminal with magnetic saturation reactor coil L3 respectively; Be connected with dc coil L4 with dc coil L2 respectively behind forward diode D5 of rectification circuit output end series connection;
A thyristor D6; Thyristor D6 is in parallel with rectification circuit output end;
A control circuit, its input is connected with the external control input terminal, and its output is controlled brilliant lock D6 conducting or is blocked.
The full bridge rectifier that described rectification circuit is made up of diode D1, D2, D3, D4; This rectification circuit output is over-voltage protection module II in parallel also.
The end of the same name of described magnetic saturation reactor coil L1 is connected with input terminal, the different name end of magnetic saturation reactor coil L1 connects the end of the same name of magnetic saturation reactor coil L3, the different name end of magnetic saturation reactor coil L3 is connected with an input of rectification circuit, and another input of rectification circuit is connected with lead-out terminal;
The end of the same name of described dc coil L2 connects the end of the same name of dc coil L4, and the different name end of dc coil L2 is connected with the rectification circuit output end of a forward diode D5 of the different name end of dc coil L4 and output series connection; The different name end of dc coil L2 also is parallel with resistance R 1 and the capacitor C 1 of connecting respectively with the different name end of dc coil L4, is parallel with resistance R 2 and the diode D7 of series connection, also over-voltage protection module I in parallel.
Described thyristor D6, its positive pole is connected with the cathode output end of rectification circuit, and its negative pole is connected with the cathode output end of rectification circuit; Its control end is connected with control module.
Described magnetic saturation reactor iron core I and magnetic saturation reactor iron core II are the closed-loop structure with magnetic saturation characteristic.
Described magnetic saturation reactor coil L1, the L3 number of turn are identical with structure, and respectively on magnetic saturation reactor iron core I and II; Described dc coil L2, the L4 number of turn are identical with structure, and dc coil L2 is on magnetic saturation reactor iron core I, and dc coil L4 is on magnetic saturation reactor iron core II; The number of turn of described dc coil L2, L4 is greater than the number of turn of magnetic saturation reactor coil L1, L3.
Described magnetic saturation reactor coil L1, the L3 number of turn, long-pending and the core structure with the core section of magnetic saturation reactor iron core I and II, should satisfy: 1/2 voltage with current limiting device operating voltage of flexible switch characteristic is added under the condition at coil L1 (or L3) two ends, and coil L1 (or L3) just in time flows through maximum normal exciting current.
Described input terminal 1 connects power supply, and lead-out terminal 2 connects transmitting loop.
A kind of method of work with current limiting device of flexible switch characteristic, its method is:
Have the flexible switch characteristic the current limiting device normal operation input electric power system and receive when opening order, thyristor turn-offs, and direct current is provided for magnetic saturation reactor dc coil L2, L4 after the full bridge rectifier rectification that the electric current of transmitting loop is formed via diode; The resistance that is connected on magnetic saturation reactor dc coil L2, L4 in the transmitting loop is very little, can not influence the electricity consumption of load; Direct current among magnetic saturation reactor dc coil L2, the L4 changes with the electric current of transmitting loop, no matter the load current size of transmitting loop, the magnetic saturation reactor iron core is in saturation condition all the time; The reactance that is connected on magnetic saturation reactor coil L1, L3 in the transmitting loop is very little, can not influence the electricity consumption of load;
When the transmitting loop fault of normally moving or be short-circuited, if control circuit is received the restriction current order, control circuit sends the conducting order for thyristor D6; After the thyristor D6 conducting, the electric current of transmitting loop circulates through thyristor D6, no longer flow through magnetic saturation reactor dc coil L2, L4, the direct current among magnetic saturation reactor dc coil L2, the L4 drop to zero, and magnetic saturation reactor iron core I and magnetic saturation reactor iron core II break away from saturation condition; The reactance that is connected on magnetic saturation reactor coil L1, L3 in the transmitting loop becomes big; Be added in the voltage at reactor winding L1 and L3 two ends less than operating voltage, flow through the electric current of reactor winding L1 and L3 less than the normal exciting current of maximum, transmitting loop almost cuts off.
The invention provides and can reduce normal duty electric current and short circuit current when providing a kind of control appliance to send to cut off order to almost turn-offing, control appliance sends when opening order can connect normal load, and the user is current limiting device and the method for electricity consumption normally.
The invention has the beneficial effects as follows: the short trouble overwhelming majority of electric power system is temporary fault, and demand limiter is decreased to almost the pass to short circuit current and has no progeny, and temporary fault can disappear; Do not need to send again the order of tripping circuit breaker; Demand limiter can carry out automatic reclosing, and the recovery system power supply improves power supply reliability.Because the turn-on and turn-off of demand limiter are carried out by power electronic device, its responsiveness is faster than circuit breaker, can realize repeatedly turn-on and turn-off operation continuously, this be circuit breaker do less than.Demand limiter is decreased to almost the pass to short circuit current and has no progeny, and faulty line is still charged, and this differentiation for temporary fault and permanent fault is provided convenience, if fault is nonvolatil, demand limiter does not carry out reclosing, tripping circuit breaker, line outage maintenance; Avoided in the past that automatic reclosing coincides with permanent fault, to the impact of electric power system.Current limiting device with flexible switch characteristic can be used for frequent switching, and does not need the occasion of isolating fully, for example: the switching of shunt capacitor, the switching of high capacity motor etc.Current limiting device with flexible switch characteristic is used for the switching extra high voltage network, can prevent switching overvoltage.Current limiting device with flexible switch characteristic has greatly enlarged the range of application of demand limiter.
Description of drawings
Fig. 1 represents to have current limiting device structure and the connected mode of flexible switch characteristic;
Fig. 2 represents the saturation characteristic of magnetic saturation reactor iron core and the relation of maximum normal exciting current.
Wherein, 1. input terminal, 2. lead-out terminal, 3. magnetic saturation reactor iron core I, 4. magnetic saturation reactor iron core II, 5. overvoltage protection device I, 6. overvoltage protection device II, 7. control circuit, 8. external control input terminal.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Have the current limiting device structure of flexible switch characteristic and connected mode as shown in Figure 1.The device series connection inserts transmission line, and input terminal 1 connects power supply, and lead-out terminal 2 connects transmitting loop.Have the flexible switch characteristic the current limiting device normal operation input electric power system and receive when opening order, control circuit 7 is given an order thyristor D6 is turn-offed.Behind the breaker closing, current limiting device series connection with flexible switch characteristic inserts transmitting loop, electric current is through magnetic saturation reactor coil L1, L3, full bridge rectifier, diode D5, dc coil L2, the L4 of magnetic saturation reactor return full bridge rectifier, connect power transmission line (or load) from lead-out terminal 2 then.At this moment, the electric current of transmitting loop provides direct current for dc coil L2, the L4 of magnetic saturation reactor after the full bridge rectifier rectification that diode D1, D2, D3, D4 form; Magnetic saturation reactor dc coil L2, L4 are zero to galvanic reactance, and magnetic saturation reactor dc coil L2, L4 are, and direct current has resistance, and resistance is very little; Strengthen the diameter of magnetic saturation reactor dc coil L2, L4, can further reduce resistance.Magnetic saturation reactor dc coil L2, L4 are very little for the impedance of transmitting loop.The load current of transmitting loop is little, and the direct current that the transmitting loop electric current provides for magnetic saturation reactor dc coil L2, L4 is just little; The load current of transmitting loop is big, and the direct current that the transmitting loop electric current provides for magnetic saturation reactor dc coil L2, L4 is just big.No matter the load current size of transmitting loop, magnetic saturation reactor iron core I3, II4 are in saturation condition all the time; Magnetic saturation reactor iron core I3, II4 are in saturation condition, and the impedance of magnetic saturation reactor coil L1, the transmitting loop of L3 is very little, can not influence the electricity consumption of load.Because the direct current among dc coil L2, the L4 has capacity of self-regulation, load current hour, the direct current among dc coil L2, the L4 reduces automatically, can lower the loss of electric power system when normally moving.
The number of turn of dc coil L2, L4 is greater than the number of turn of magnetic saturation reactor coil L1, L3, to guarantee the DC current values I of transmitting loop input magnetic saturation reactor dc coil L2, L4
dMultiply by dc coil L2 number of turn N
2Ampere-turn value I
dN
2Peak I greater than the transmitting loop load current
mMultiply by magnetic saturation reactor coil L1 number of turn N
1Ampere-turn value I
dN
1
The capacitor C 1 in parallel with two magnetic saturation reactor dc coils is in order to reduce the fluctuation of direct current among magnetic saturation reactor dc coil L2, the L4; Can absorb the burst pulse overvoltage at magnetic saturation reactor dc coil two ends.The resistance R 1 of connecting with C1 is used for the charging current of restriction C1, flows through excessive charging current when avoiding diode D1, D2, D3, the D4 conducting of full bridge rectifier.
When transmitting loop normal flow overload electric current, or electric power system turn-offs order if control circuit is received when being short-circuited, and electric current is not restricted.
When the transmitting loop fault of normally moving or be short-circuited, if control circuit is received the restriction current order, control circuit sends the conducting order for thyristor D6; After the D6 conducting, the voltage at full bridge rectifier two ends drops to the tube voltage drop of thyristor D6.Be in series with diode D5 in magnetic saturation reactor dc coil L2, L4, among magnetic saturation reactor dc coil L2, the L4 resistance arranged, the voltage at full bridge rectifier two ends must could produce electric current greater than the tube voltage drop of diode D5; So dc coil L2, the L4 of magnetic saturation reactor lose voltage, direct current drops to zero; Magnetic saturation reactor iron core I3 and magnetic saturation reactor iron core II4 break away from saturation condition, and the reactance that is connected on magnetic saturation reactor coil L1, L3 in the transmitting loop becomes big; Be added in the voltage at reactor winding L1 and L3 two ends less than operating voltage, flow through the electric current of reactor winding L1 and L3 less than the normal exciting current of maximum, transmitting loop almost cuts off.
The dc coil of magnetic saturation reactor is energy-storage travelling wave tube.After the thyristor D6 conducting, the direct current among dc coil L2, the L4 of magnetic saturation reactor can not reduce to zero at once.Diode D7 and the resistance R 2 that is connected in series are for it provides the afterflow path.Resistance R 2 consumed energies, the direct current among dc coil L2, the L4 of quickening magnetic saturation reactor reduces to zero.Capacitor C 1 and the resistance R 1 that is connected in series, the direct current that also can accelerate among dc coil L2, the L4 of magnetic saturation reactor drops to zero.As required, with the dc coil L2 of magnetic saturation reactor, direct current loop that L4 connects in can also increase other field suppression equipments, have many existing field suppression equipments available, also can invent better field suppression equipment.Direct current among dc coil L2, the L4 of quickening magnetic saturation reactor drops to zero, and the current limiting device current limliting time of namely having accelerated to have the flexible switch characteristic, raising has the performance of the current limiting device of flexible switch characteristic.
Direct current among dc coil L2, the L4 of magnetic saturation reactor flows through the electric current of reactor winding L1 and L3 less than the normal exciting current of maximum after dropping to zero.The relation of the saturation characteristic of magnetic saturation reactor iron core and maximum normal exciting current as shown in Figure 2.
Magnetic saturation reactor coil L1 produces the power frequency magnetic flux in magnetic saturation reactor iron core I3, this power frequency magnetic flux produces induced electromotive force at dc coil L2; Magnetic saturation reactor coil L3 produces the power frequency magnetic flux in magnetic saturation reactor iron core II4, this power frequency magnetic flux produces induced electromotive force at dc coil L4; The power frequency induced electromotive force of dc coil L2 is kept to zero mutually with the power frequency induced electromotive force of dc coil L4, and the alternating current of magnetic saturation reactor coil L1, L3 does not exert an influence to DC loop.
Overvoltage protection device I5, II6 are used for each protection diode, thyristor and relevant elements.The property class quasi-static of overvoltage protection device is pressed diode.
Thyristor D6 can be gate level turn-off thyristor, or integrated gate commutated thyristor, or the device of other controlled conductings processed, shutoff.
The effect of thyristor D6 is conducting and the shutoff that control has the current limiting device of flexible switch characteristic.The current limiting device that has the flexible switch characteristic during thyristor D6 conducting turn-offs, the current limiting device conducting that thyristor D6 has the flexible switch characteristic when turn-offing.Also available two-way admittance thyristor is parallel to the mode of the full bridge rectifier input of diode D1, D2, D3, D4 composition, and control has conducting and the shutoff of the current limiting device of flexible switch characteristic.The current limiting device that has the flexible switch characteristic during conducting of two-way admittance thyristor turn-offs, the current limiting device conducting that the two-way admittance thyristor has the flexible switch characteristic when turn-offing.
For after making thyristor D6 conducting, direct current does not flow into the magnetic saturation reactor dc coil, and diode D5 can be with many diode forward series connection.
Diode D5 can also be replaced by thyristor, and thyristor D5 turn-offs during thyristor D6 conducting, thyristor D5 conducting when thyristor D6 turn-offs.Like this, when thyristor D5 turn-offs, can improve the demagnetization effect of dc coil L2, the L4 of magnetic saturation reactor.
Magnetic saturation reactor iron core I and magnetic saturation reactor iron core II are the closed-loop structure with saturation characteristic.Be typically the square shape structure, but also circular configuration, etc.
Described each parts with current limiting device of flexible switch characteristic can manufacture and design with prior art, can realize fully.Broad prospect of application is arranged.
Claims (8)
1. current limiting device with flexible switch characteristic is characterized in that it comprises:
Magnetic saturation reactor iron core I and magnetic saturation reactor iron core II are equipped with magnetic saturation reactor coil L1 and dc coil L2 at magnetic saturation reactor iron core I; At magnetic saturation reactor iron core II magnetic saturation reactor coil L3 and dc coil L4 are installed; Wherein magnetic saturation reactor coil L1 one end is connected with magnetic saturation reactor coil L3 one end, and dc coil L2 one end is connected with dc coil L4 one end; The magnetic saturation reactor coil L1 other end is connected with input terminal;
A rectification circuit that is constituted by a diode; Two inputs of rectification circuit are connected with lead-out terminal with magnetic saturation reactor coil L3 respectively; Be connected with dc coil L4 behind forward diode D5 of an output series connection of rectification circuit;
A thyristor D6; Thyristor D6 is in parallel with rectification circuit output end;
A control circuit, its input is connected with the external control input terminal, and its output is connected with the controlled end of thyristor D6, control thyristor D6 conducting or block.
2. the current limiting device with flexible switch characteristic as claimed in claim 1 is characterized in that, the full bridge rectifier that described rectification circuit is made up of diode D1, D2, D3, D4; These rectification circuit two outputs are over-voltage protection module II in parallel also.
3. the current limiting device with flexible switch characteristic as claimed in claim 1, it is characterized in that, the end of the same name of described magnetic saturation reactor coil L1 is connected with input terminal, the different name end of magnetic saturation reactor coil L1 connects the end of the same name of magnetic saturation reactor coil L3, the different name end of magnetic saturation reactor coil L3 is connected with an input of rectification circuit, and another input of rectification circuit is connected with lead-out terminal;
The end of the same name of described dc coil L2 connects the end of the same name of dc coil L4, and the different name end of dc coil L2 is connected with an output of the rectification circuit that is in series with forward diode D5 respectively with the different name end of dc coil L4; Also be parallel with resistance R 1 and the capacitor C 1 of connecting respectively between the different name end of dc coil L2 and the different name end of dc coil L4, be parallel with resistance and the diode D7 of series connection, and over-voltage protection module I in parallel.
4. the current limiting device with flexible switch characteristic as claimed in claim 1 is characterized in that, described thyristor D6, and its positive pole is connected with the cathode output end of rectification circuit, and its negative pole is connected with the cathode output end of rectification circuit; Its control terminal is connected with control circuit.
5. the current limiting device with flexible switch characteristic as claimed in claim 1 is characterized in that, described magnetic saturation reactor iron core I and magnetic saturation reactor iron core II are the closed-loop structure with magnetic saturation characteristic.
6. the current limiting device with flexible switch characteristic as claimed in claim 1 is characterized in that, described magnetic saturation reactor coil L1, the L3 number of turn are identical with structure, and respectively on magnetic saturation reactor iron core I and II; Described dc coil L2, the L4 number of turn are identical with structure, and dc coil L2 is on magnetic saturation reactor iron core I, and dc coil L4 is on magnetic saturation reactor iron core II; The number of turn of described dc coil L2, L4 is greater than the number of turn of magnetic saturation reactor coil L1, L3.
7. the current limiting device with flexible switch characteristic as claimed in claim 1, it is characterized in that, described magnetic saturation reactor coil L1, the L3 number of turn, long-pending and the core structure with the core section of magnetic saturation reactor iron core I and II, should satisfy: 1/2 voltage with current limiting device operating voltage of flexible switch characteristic is added under the condition at magnetic saturation reactor coil L1 or magnetic saturation reactor coil L3 two ends, and magnetic saturation reactor coil L1 or magnetic saturation reactor coil L3 just in time flow through maximum normal exciting current.
8. one kind is adopted the described method of work with current limiting device of flexible switch characteristic of claim 1, it is characterized in that its method is:
In the electric power system of normal operation input with receive when opening order, thyristor D6 turn-offs, and direct current is provided for dc coil L2, L4 after the full bridge rectifier rectification that the electric current of transmitting loop is formed via diode; The resistance that is connected on dc coil L2, L4 in the transmitting loop is very little, can not influence the electricity consumption of load; Direct current among dc coil L2, the L4 changes with the electric current of transmitting loop, no matter the load current size of transmitting loop, the magnetic saturation reactor iron core is in saturation condition all the time; The reactance that is connected on magnetic saturation reactor coil L1, L3 in the transmitting loop is very little, can not influence the electricity consumption of load;
When the transmitting loop fault of normally moving or be short-circuited, if control circuit is received the restriction current order, control circuit sends the conducting order for thyristor D6; After the thyristor D6 conducting, the electric current of transmitting loop is through thyristor D6 circulation, and no longer flow through dc coil L2, L4, the direct current among dc coil L2, the L4 drop to zero, and magnetic saturation reactor iron core I and magnetic saturation reactor iron core II break away from saturation condition; The reactance that is connected on magnetic saturation reactor coil L1, L3 in the transmitting loop becomes big; Be added in the voltage at magnetic saturation reactor coil L1 and L3 two ends less than operating voltage, flow through the electric current of magnetic saturation reactor coil L1 and L3 less than the normal exciting current of maximum, transmitting loop almost cuts off.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010575392 CN102005749B (en) | 2010-12-06 | 2010-12-06 | Current limiting device with flexible switch characteristic and current limiting method |
| PCT/CN2011/001986 WO2012075676A1 (en) | 2010-12-06 | 2011-11-29 | Current limiting device and method having flexible switching performance |
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| CN 201010575392 CN102005749B (en) | 2010-12-06 | 2010-12-06 | Current limiting device with flexible switch characteristic and current limiting method |
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| CN102005749A CN102005749A (en) | 2011-04-06 |
| CN102005749B true CN102005749B (en) | 2013-08-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012075676A1 (en) * | 2010-12-06 | 2012-06-14 | 山东大学 | Current limiting device and method having flexible switching performance |
| CN102592807B (en) * | 2012-02-09 | 2014-07-16 | 山东大学 | On-load tap switch of saturable reactor with switch characteristics |
| CN102592808B (en) * | 2012-02-14 | 2014-09-03 | 山东大学 | On-load tap switch and operating method thereof |
| US10447031B2 (en) * | 2016-10-31 | 2019-10-15 | Varian Semiconductor Equipment Associates, Inc. | Fault current limiter with modular mutual reactor |
| CN109245076B (en) * | 2018-11-12 | 2020-06-19 | 国网浙江省电力有限公司宁波供电公司 | Quick response magnetic control fault current limiter |
| CN112564070A (en) * | 2020-11-30 | 2021-03-26 | 武汉大学 | Novel rapid energy storage type magnetic saturation iron core direct current fault current limiter and current limiting method |
| CN112564071A (en) * | 2020-11-30 | 2021-03-26 | 武汉大学 | Novel quick-response direct current limiter and current limiting method |
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| GB1105444A (en) * | 1965-05-03 | 1968-03-06 | Licentia Gmbh | Improvements relating to the protection of alternating current networks from the effects of excess current |
| CN101521373A (en) * | 2008-11-27 | 2009-09-02 | 李晓明 | Device and method for limiting short-circuit current |
| CN101521374A (en) * | 2008-11-18 | 2009-09-02 | 李晓明 | Short-circuit current limiting device of magnetic saturation reactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060158803A1 (en) * | 2003-01-27 | 2006-07-20 | Bar Ilan University | Fault current limiters (fcl) with the cores staurated by superconducting coils |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1105444A (en) * | 1965-05-03 | 1968-03-06 | Licentia Gmbh | Improvements relating to the protection of alternating current networks from the effects of excess current |
| CN101521374A (en) * | 2008-11-18 | 2009-09-02 | 李晓明 | Short-circuit current limiting device of magnetic saturation reactor |
| CN101521373A (en) * | 2008-11-27 | 2009-09-02 | 李晓明 | Device and method for limiting short-circuit current |
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