CN103078306A - Fault current limiter on basis of combined rapid switch-on switch - Google Patents
Fault current limiter on basis of combined rapid switch-on switch Download PDFInfo
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- CN103078306A CN103078306A CN2013100070279A CN201310007027A CN103078306A CN 103078306 A CN103078306 A CN 103078306A CN 2013100070279 A CN2013100070279 A CN 2013100070279A CN 201310007027 A CN201310007027 A CN 201310007027A CN 103078306 A CN103078306 A CN 103078306A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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Abstract
The invention relates to a fault current limiter on the basis of a combined rapid switch-on switch. The combined rapid switch-on switch is firstly connected in parallel with a capacitor C and then is connected in series with a conventional reactor L; the combined rapid switch-on switch is formed by combining a tight coupling double-winding reactor and a rapid switch-on switch, of which dotted terminals are opposite; a first winding L1 of the tight coupling double-winding reactor is firstly connected in series with the rapid switch-on switch and then is connected in parallel with a second winding L2; the rapid switch-on switch is formed by connecting one group or a plurality of groups of mechanical switches K, transistors T, controllable trigger gaps G and lightning arresters MOV in parallel; and in the case of a short circuit fault, switch-on on the first winding L1 of the tight coupling double-winding reactor can be implemented by selecting the rapid switch-on switch with tolerance to a low short circuit current. After the first winding L is conducted, reactances generated by the first winding L1 and the second winding L2 of the tight coupling double-winding reactor are balanced out mutually, so that the reactances are reduced.
Description
Technical field
The present invention relates to a kind of fault current limiter.
Background technology
Fast development along with national economy, society constantly increases the demand of electric power, driven the development of electric power system, unit and station capacity, substation capacity, city and center of industry load constantly increase, just so that interconnected between the electric power system, short circuit current level in the electrical networks at different levels improves constantly, and short trouble is also increasing to the destructiveness of electric power system and continuous electric equipment thereof.And in growing to the demand of electric energy, people also have higher requirement to the quality of power supply, power supply reliability and fail safe etc.Yet the transient stability problem of large electrical network is more outstanding, and wherein one of most important reason is because the conventional electric power technology lacks effective short-circuit current restriction technologies.At present, extensively adopt in the world circuit breaker that short circuit current is fully cut-off, because short circuit current level is directly related with the capacity of system, in the certain situation of the specified drop-out current level of circuit breaker, adopt and fully cut-off the growth that short circuit current will limit the capacity of electric power system, and circuit breaker is expensive and its price rises rapidly with the increase of its specified drop-out current.Along with the expansion of net capacity and scale, the connecting-disconnecting function of circuit breaker more and more has been difficult to adapt to the needs of operation of power networks.
Short-circuit fault current limiter provides new approaches for this solution of problem.The fault current limiter technology of current comparative maturity mainly contains series connection current limiting reactor, series resonant-type fault current limiter, controlled series compensation fault current limiter etc., and the fault current limiter technology that is in conceptual phase mainly is to use the current limiting technique that new material is realized, comprises superconductive current limiter, PTC thermistor flow restricter and solid-state current limiter.In current flow restricter technology, the most ripe with the technology of series connection current limiting reactor and series resonance-type flow restricter, reliability is also the highest.The series resonance-type flow restricter does not have reactive power loss, has great application prospect.For the series resonance-type flow restricter, the capacitor bypass resistance is a key technology, mainly contain following several bypass resistance: based on bypass resistance (the operating characteristic comparison of two kinds of economical fault current limiters of saturable reactor, the Power System and its Automation journal, 2005,17(4): 71-75), the bypass resistance (impact of MOA-based FCL on power system transient stability based on lightning arrester, Electric Power Automation Equipment, 2007,27(8): 51-54) with based on the bypass resistance of power electronics and high-speed switch (based on the emulation of the series resonance-type fault current limiter of high-speed switch, high voltage technique, 2006,32(5): 80-83).But above-mentioned all capacitor bypass resistances all need pass through close to whole short circuit currents, and therefore, capacitor bypass resistance parts need to design according to the whole short circuit currents of tolerance, and cost is very high.
Summary of the invention
The object of the invention is to overcome the shortcoming of conventional series resonant-type fault current limiter, propose a kind of fault current limiter based on the composite type rapid closing switch.This composite type rapid closing switch adopts a mode that branch road is connected with rapid closing switch of the opposite close coupling double winding reactor of Same Name of Ends, can be with the short-circuit impact current reduction of rapid closing switch; Also can adopt a mode that branch road is connected with rapid closing switch of secondary double winding reactor in the two-level concatenation structure close coupling double winding reactor, can be down to the short-circuit impact electric current of rapid closing switch lower; Also can adopt a branch road of every group of reactor in the two groups of opposite close coupling double winding of cascaded structure Same Name of Ends reactors and the mode of one group of rapid closing switch series connection, short-circuit impact electric current and the overvoltage of rapid closing switch all can be reduced.The fault current limiter based on the composite type rapid closing switch that the present invention proposes, flexible, easily enforcement can be applicable in the network system of various different electric pressures, different capabilities.
To achieve these goals, the technical solution used in the present invention is as follows:
The fault current limiter that the present invention is based on the composite type rapid closing switch is made of conventional reactor or the identical close coupling reactor of Same Name of Ends, capacitor and composite type rapid closing switch.Described composite type rapid closing switch is connected with conventional reactor with the first parallel connection of capacitor again, perhaps a branch road of the identical close coupling double winding of Same Name of Ends reactor is connected with the composite type rapid closing switch, another branch road and the capacitor's seriesu of the identical close coupling double winding of Same Name of Ends reactor.
Described composite type rapid closing switch is comprised of Same Name of Ends opposite close coupling double winding reactor and rapid closing switch.
The identical close coupling double winding of described Same Name of Ends reactor is comprised of hollow, closure or the semi-closed iron core of the first winding, the second winding and rectangle, and described the first winding is identical with the number of turn of the second winding, is wound on the stem stem with parallel way.
The opposite close coupling double winding of the Same Name of Ends reactor of composition composite type rapid closing switch is comprised of hollow, closure or the semi-closed iron core of the first winding, the second winding and rectangle, described the first winding is identical with the number of turn of the second winding, is wound on the stem stem in the inverse parallel mode.
Described fault current limiter is connected in the network system.
The present invention can adopt following two kinds of technical schemes:
After the first fault current limiter adopts the composite type rapid closing switch and capacitor elder generation is in parallel, connect with conventional reactor again.When normal operation, the composite type rapid closing switch is large impedance state, and electric current mainly flows through from the circuit of conventional reactor and capacitor's seriesu composition, and conventional reactor and capacitor form series resonant circuit, be low impedance state, very little on the network system impact.When network system broke down short circuit, the fast reaction of composite type rapid closing switch was little impedance state, and short circuit current is transferred to the rapid closing switch branch road from the capacitor branch road, and the impedance of whole network system increases, and short circuit current descends.
The second fault current limiter adopts a branch road of the identical close coupling double winding of Same Name of Ends reactor to connect another branch road and the capacitor's seriesu of the identical close coupling double winding of Same Name of Ends reactor with the composite type rapid closing switch; When normal operation, the composite type rapid closing switch is large impedance state, electric current mainly flows through from the circuit of Same Name of Ends identical close coupling double winding reactor and capacitor's seriesu composition, Same Name of Ends identical close coupling double winding reactor and capacitor form series resonant circuit and be low impedance state, and be very little on the network system impact.When network system broke down short circuit, the fast reaction of composite type rapid closing switch was little impedance state, and short circuit current is transferred to the rapid closing switch branch road from the capacitor branch road, and the impedance of whole network system increases, and short circuit current descends;
Described composite type rapid closing switch also can adopt following three kinds of technical schemes:
The first composite type rapid closing switch is combined by Same Name of Ends opposite close coupling double winding reactor and rapid closing switch.The first winding elder generation of the opposite close coupling double winding of described Same Name of Ends reactor and rapid closing switch series connection, then the second winding parallel of opposite close coupling double winding reactor with described Same Name of Ends.Described rapid closing switch is composed in parallel by in mechanical switch, thyristor, controlled triggered gap and several switchgears of lightning arrester one or more groups; When short trouble, can select the lower rapid closing switch realization of tolerance short circuit current to the combined floodgate of the opposite close coupling double winding of described Same Name of Ends reactor the first winding.After the first winding of the opposite close coupling double winding of described Same Name of Ends reactor was connected, the reactance that the first winding of the opposite close coupling double winding of described Same Name of Ends reactor and the second winding produce was cancelled each other, and total reactance reduces.
The second composite type rapid closing switch adopts Same Name of Ends opposite close coupling double winding reactor and the rapid closing switch of two-level concatenation to combine.The opposite close coupling double winding of described Same Name of Ends reactor adopts the two-level concatenation mode to connect, the first winding and the rapid closing switch of the opposite close coupling double winding of second level Same Name of Ends reactor are connected first, then the second winding parallel of the opposite close coupling double winding with second level Same Name of Ends of the first winding reactor of the opposite close coupling double winding of described second level Same Name of Ends reactor; The first windings in series of the opposite close coupling double winding with first order Same Name of Ends of the opposite close coupling double winding of described second level Same Name of Ends reactor reactor, then the second winding parallel of opposite close coupling double winding reactor with first order Same Name of Ends.Described rapid closing switch is composed in parallel by in mechanical switch, thyristor, controlled triggered gap and the lightning arrester one or more groups; When short trouble, can select the lower rapid closing switch realization of tolerance short circuit current to the combined floodgate of secondary close coupling double winding reactor the first winding.After the first winding conducting of secondary close coupling double winding reactor, the reactance that each branch road winding of one-level close coupling double winding reactor and secondary close coupling double winding reactor produces can be cancelled each other, and total reactance reduces.
The third composite type rapid closing switch adopts the two groups of Same Name of Ends opposite close coupling double winding reactors and the rapid closing switch that are connected in series to constitute.The two groups of opposite close coupling double winding of Same Name of Ends reactors are connected in series, the first winding and first group of rapid closing switch of the first group of opposite close coupling double winding of Same Name of Ends reactor are connected first, then with the second winding parallel of the first group of opposite close coupling double winding of Same Name of Ends reactor; The first winding and second group of rapid closing switch of the second group of opposite close coupling double winding of Same Name of Ends reactor are connected first, then with the second winding parallel of the second group of opposite close coupling double winding of Same Name of Ends reactor; First group of Same Name of Ends opposite close coupling double winding reactor and the second group of opposite close coupling double winding of Same Name of Ends reactor are connected at last.Described rapid closing switch is composed in parallel by in mechanical switch, thyristor, controlled triggered gap and several switchgears of lightning arrester one or more groups; When short trouble, can select tolerance short circuit current and voltage all lower rapid closing switch realize combined floodgate to the two groups of opposite close coupling double winding of Same Name of Ends reactor first windings.At the first winding of the two groups of opposite close coupling double winding of Same Name of Ends reactors all after the conducting, the reactance that two groups of each branch road windings of the opposite close coupling double winding of Same Name of Ends reactor produce can be cancelled each other, and total reactance reduces.
Fault current limiter of the present invention shows as Low ESR when normal operation, and shows as large impedance when short trouble.Close coupling double winding reactor in the fault current limiter of the present invention can adopt hollow, iron core or half core structure; Close coupling double winding reactor and rapid closing switch all can adopt three-phase absolute construction or three-phase combining structure.
The present invention has following major advantage:
1) fault current limiter of the present invention is little on the stable state impact of electrical network.When normal operation, the stable state impedance of fault current device is very little, and System Reactive Power can not increase electric power.
2) the present invention suppresses the peak value of fault current by the impedance variation of close coupling double winding reactor self in the composite type rapid closing switch, then the steady-state value that suppresses fault current by the closure of rapid closing switch, therefore, this fault current limiter is fast to fault current response, and simple in structure, reliability is high.
3) the present invention can be used for constructing jumbo fault current limiter.The mode that adopts the single branch road of close coupling double winding reactor to connect with rapid closing switch reduces the capacity of short circuit of rapid closing switch, has reduced technical difficulty and cost that large-scale rapid closing switch is made, and the market competitiveness is more arranged.
Description of drawings
Fig. 1 is circuit and the magnetic circuit schematic diagram of composite type rapid closing switch when steady operation;
Fig. 2 is circuit and the magnetic circuit schematic diagram of composite type rapid closing switch when short circuit;
Fig. 3 is the equivalent circuit diagram of composite type rapid closing switch;
Fig. 4 is the equivalent circuit diagram of the box-like rapid closing switch of two-level concatenation structural group;
Fig. 5 is the equivalent circuit diagram of two groups of cascaded structure composite type rapid closing switchs;
Fig. 6 is that the specific embodiment of the invention 1 is based on the fault current limiter equivalent circuit diagram of composite type rapid closing switch;
Fig. 7 is that the specific embodiment of the invention 2 another kinds are based on the fault current limiter equivalent circuit diagram of composite type rapid closing switch;
Fig. 8 is that the specific embodiment of the invention 3 is based on the fault current limiter equivalent circuit diagram of the box-like rapid closing switch of two-level concatenation structural group;
Fig. 9 is that the specific embodiment of the invention 4 another kinds are based on the fault current limiter equivalent circuit diagram of the box-like rapid closing switch of two-level concatenation structural group.
Figure 10 is 5 one kinds of fault current limiter equivalent circuit diagrams based on two groups of cascaded structure composite type rapid closing switchs of the specific embodiment of the invention.
Figure 11 is that the specific embodiment of the invention 6 another kinds are based on the fault current limiter equivalent circuit diagram of two groups of cascaded structure composite type rapid closing switchs.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
The fault current limiter that the present invention is based on the composite type rapid closing switch is made of conventional reactor or the identical close coupling double winding of Same Name of Ends reactor, capacitor and composite type rapid closing switch.Described composite type rapid closing switch is made of Same Name of Ends opposite close coupling double winding reactor and rapid closing switch K.
Figure 1 shows that circuit and the magnetic circuit schematic diagram of composite type rapid closing switch when steady operation.As shown in Figure 1, described composite type rapid closing switch is by the opposite close coupling double winding of Same Name of Ends reactor, and rapid closing switch K combines, and the opposite close coupling double winding of Same Name of Ends reactor is comprised of the iron core of hollow, closure or the semi-closed of the first winding L 1, the second winding L 2 and rectangle.In the opposite close coupling double winding of the described Same Name of Ends reactor, described the first winding L 1 is identical with the number of turn of the second winding L 2, is wound on the stem stem in the inverse parallel mode.The first winding L 1 elder generation and the rapid closing switch K series connection of the opposite close coupling double winding of Same Name of Ends reactor, and then and described the second winding L 2 parallel connections.When steady operation, rapid closing switch K is in the state of cut-offfing, and the resistance value of rapid closing switch is L
2, be large impedance.
Figure 2 shows that circuit and the magnetic circuit schematic diagram of composite type rapid closing switch when network system is short-circuited fault.When breaking down short circuit, rapid closing switch K is closed, and the opposite close coupling double winding of Same Name of Ends reactor the first winding L 1 is identical with the electric current that the second winding L 2 is passed through, the magnetic flux equal and opposite in direction of generation, opposite direction.Because the magnetic flux that the opposite close coupling double winding of this Same Name of Ends reactor produces is mainly leakage flux, leakage inductance is relatively very little, therefore is little impedance state.In addition, the short circuit current of described the first winding L 1 and the second winding L 2 is half of the total short circuit current of system, and therefore, rapid closing switch K can select to tolerate the lower rapid closing switch of short circuit current, the Reliability Enhancement of rapid closing switch, and cost reduces.
Figure 3 shows that the equivalent circuit diagram of composite type rapid closing switch.The composite type rapid closing switch is combined by Same Name of Ends opposite close coupling double winding reactor and rapid closing switch K.The self-induction of two winding L 1 of the opposite close coupling double winding of Same Name of Ends reactor and L2 is respectively L
1And L
2, mutual inductance is M.Because the double winding number of turn is identical, Same Name of Ends is opposite, so L
1=L
2, mutual inductance M and L
1And L
2Very approaching.The first winding L 1 elder generation and the rapid closing switch K series connection of the opposite close coupling double winding of Same Name of Ends reactor, and then the second winding L 2 parallel connections of opposite close coupling double winding reactor with Same Name of Ends.
Figure 4 shows that the equivalent circuit diagram of the composite type rapid closing switch of two-level concatenation structure.The box-like rapid closing switch of two-level concatenation structural group is combined by the opposite close coupling double winding of first order Same Name of Ends reactor, second level Same Name of Ends opposite close coupling double winding reactor and rapid closing switch.The self-induction of two winding L 1 of the opposite close coupling double winding of first order Same Name of Ends reactor and L2 is respectively L
1And L
2, mutual inductance is M, L
1=L
2The opposite close coupling double winding with first order Same Name of Ends of the structure reactor of the opposite close coupling double winding of second level Same Name of Ends reactor is similar, and the first winding L 11 of the opposite close coupling double winding of second level Same Name of Ends reactor and the mutual inductance of the second winding L 12 are M
1, self-induction L
11=L
12The first winding L 11 elder generations and the rapid closing switch K series connection of the opposite close coupling double winding of second level Same Name of Ends reactor, and then the second winding L 12 parallel connections of opposite close coupling double winding reactor with second level Same Name of Ends; The first winding L 1 series connection of second level Same Name of Ends opposite close coupling double winding reactor and first order close coupling double winding reactor, then the second winding L 2 parallel connections of opposite close coupling double winding reactor with first order Same Name of Ends.
Figure 5 shows that the equivalent circuit diagram of the composite type rapid closing switch of two groups of cascaded structures.The composite type rapid closing switch of two groups of cascaded structures is combined by the first group of opposite close coupling double winding of Same Name of Ends reactor, first group of rapid closing switch, second group of Same Name of Ends opposite close coupling double winding reactor and second group of rapid closing switch.The self-induction of first group of two winding L 1 of the opposite close coupling double winding of Same Name of Ends reactor and L2 is respectively L
1And L
2, mutual inductance is M, L
1=L
2The structure of the second group of opposite close coupling double winding of Same Name of Ends reactor is similar with the first group of opposite close coupling double winding of Same Name of Ends reactor, and the first winding L 11 of the second group of opposite close coupling double winding of Same Name of Ends reactor and the mutual inductance of the second winding L 12 are M
1, self-induction L
11=L
12The first winding L 1 of the first group of opposite close coupling double winding of Same Name of Ends reactor first and rapid closing switch K1 series connection, and then with the second winding L 2 parallel connections of the described first group of opposite close coupling double winding of Same Name of Ends reactor; The first winding L 11 of the second group of opposite close coupling double winding of Same Name of Ends reactor first and rapid closing switch K2 series connection, and then with the second winding L 12 parallel connections of the second group of opposite close coupling double winding of Same Name of Ends reactor; The two groups of opposite close coupling double winding of Same Name of Ends reactors are connected at last.
Figure 6 shows that embodiment 1 is based on the fault current limiter topological circuit figure of composite type rapid closing switch.The embodiment of the invention 1 is made of conventional reactor L, capacitor C and composite type rapid closing switch, and described composite type rapid closing switch is comprised of Same Name of Ends opposite close coupling double winding reactor and rapid closing switch.The self-induction of two winding L 1 of the opposite close coupling double winding of Same Name of Ends in composite type rapid closing switch reactor and L2 is respectively L
1And L
2, mutual inductance is M.Because the double winding number of turn is identical, Same Name of Ends is opposite, so L
1=L
2, mutual inductance M and L
1And L
2Very approaching.The first winding L 1 elder generation and the rapid closing switch series connection of the opposite close coupling double winding of Same Name of Ends reactor, and then the second winding L 2 parallel connections of opposite close coupling double winding reactor with Same Name of Ends; Connect with conventional reactor L again after capacitor C and the parallel connection of composite type rapid closing switch.When network system is normally moved, the reactance value L ' of rapid closing switch=L
2, can make L ' by appropriate design is a very large value, electric current mainly flows through from the series resonant circuit of L and C composition like this, and is very little on the network system impact; When network system broke down short circuit, the reactance of composite type rapid closing switch became
It is a very little reactance value; Fault current is transferred to composite type rapid closing switch branch road from capacitor C branch road, the impedance of fault current limiter increases and the inhibition short circuit current, the short circuit current that rapid closing switch passes through is lower, like this can be with the lower rapid closing switch of short circuit current, cost is lower, and reliability can improve.The opposite close coupling double winding of Same Name of Ends reactor can adopt hollow, iron core or half core structure, and the composite type rapid closing switch can adopt in mechanical switch K, thyristor T, controlled triggered gap G and several switchgears of lightning arrester MOV one or more groups to compose in parallel.
Figure 7 shows that embodiment 2 is based on the fault current limiter topological circuit figure of composite type rapid closing switch.The embodiment of the invention 2 is made of the identical close coupling double winding of Same Name of Ends reactor, capacitor C and composite type rapid closing switch, described composite type rapid closing switch is comprised of Same Name of Ends opposite close coupling double winding reactor and rapid closing switch, and the two groups of opposite close coupling double winding of Same Name of Ends reactors are connected in series.Identical with embodiment 1 is that the self-induction of two winding L 1 of the opposite close coupling double winding of the Same Name of Ends in composite type rapid closing switch reactor and L2 is respectively L
1And L
2, mutual inductance is M.Because the double winding number of turn is identical, Same Name of Ends is opposite, so L
1=L
2, mutual inductance M and L
1And L
2Very approaching.The first winding L 1 elder generation and the rapid closing switch series connection of the opposite close coupling double winding of Same Name of Ends reactor, and then the second winding L 2 parallel connections of opposite close coupling double winding reactor with Same Name of Ends; As different from Example 1: the first branch road L21 of the identical close coupling double winding of described Same Name of Ends reactor and the series connection of composite type rapid closing switch, the second branch road L22 of the identical close coupling double winding of Same Name of Ends reactor and capacitor C series connection.When network system is normally moved, the reactance value L ' of composite type rapid closing switch=L
2, can make L ' by appropriate design is a very large value, electric current is mainly from the second branch road L of the identical close coupling double winding of Same Name of Ends reactor like this
22Flow through in the series resonance branch road that forms with C, very little on the network system impact; When network system broke down short circuit, the reactance of composite type rapid closing switch became
It is a very little reactance value; Fault current is transferred to composite type rapid closing switch branch road from capacitor C branch road, the impedance of flow restricter increases and suppresses short circuit current, and the short circuit current that rapid closing switch passes through is lower, like this can be with the lower rapid closing switch of short circuit current, cost, and reliability can improve.The opposite close coupling double winding with Same Name of Ends of Same Name of Ends identical close coupling double winding reactor reactor all can adopt hollow, iron core or half core structure, and the composite type rapid closing switch can adopt in mechanical switch K, thyristor T, controlled triggered gap G and several switchgears of lightning arrester MOV one or more groups to compose in parallel.
As shown in Figure 8, the embodiment of the invention 3 is the fault current limiter based on the box-like rapid closing switch of two-level concatenation structural group.The embodiment of the invention 3 is made of conventional reactor L, capacitor C and composite type rapid closing switch, described composite type rapid closing switch is comprised of Same Name of Ends opposite close coupling double winding reactor and rapid closing switch, and the two groups of opposite close coupling double winding of Same Name of Ends reactors adopt the two-level concatenation structure.In the composite type rapid closing switch, the self-induction of two winding L 1 of the opposite close coupling double winding of first order Same Name of Ends reactor and L2 is respectively L
1And L
2, mutual inductance is M, L
1=L
2The opposite close coupling double winding with first order Same Name of Ends of the structure reactor of the opposite close coupling double winding of second level Same Name of Ends reactor is similar, and the first winding L 11 of the opposite close coupling double winding of second level Same Name of Ends reactor and the mutual inductance of the second winding L 12 are M
1, self-induction L
11=L
12The first winding L 11 elder generations and the rapid closing switch series connection of the opposite close coupling double winding of second level Same Name of Ends reactor, and then the second winding L 12 parallel connections of opposite close coupling double winding reactor with second level Same Name of Ends; The first winding L 1 series connection of the opposite close coupling double winding with first order Same Name of Ends of second level Same Name of Ends opposite close coupling double winding reactor reactor, then the second winding L 2 parallel connections of opposite close coupling double winding reactor with first order Same Name of Ends.Connect with conventional reactor L again after the composite type rapid closing switch parallel connection of capacitor C and two-level concatenation structure.The reactance value of composite type rapid closing switch when normal operation
By appropriate design L
1And L
2, L
12And L
22Numerical value, can make L ' is a very large value, electric current mainly flows through from the series resonant circuit that L and C form like this, and is very little on the network system impact; When network system broke down short circuit, the reactance of composite type rapid closing switch became
It is a very little reactance value; Fault current is transferred to composite type rapid closing switch branch road from capacitor C branch road, the impedance of flow restricter increases and the inhibition short circuit current, the short circuit current that rapid closing switch passes through can more reduce, like this can be with the lower rapid closing switch of short circuit current, cost, and reliability can improve.The opposite close coupling double winding with second level Same Name of Ends of first order Same Name of Ends opposite close coupling double winding reactor reactor all can adopt hollow, iron core or half core structure, and the composite type rapid closing switch can adopt in mechanical switch K, thyristor T, controlled triggered gap G and several switchgears of lightning arrester MOV one or more groups to compose in parallel.Need to prove that present embodiment may extend to the form of the above composite type rapid closing switch of two-stage cascade, the electric current that bears of rapid closing switch is lower like this.
As shown in Figure 9, the embodiment of the invention 4 is another kind of fault current limiter based on the box-like rapid closing switch of two-level concatenation structural group.The embodiment of the invention 4 is made of the identical close coupling double winding of Same Name of Ends reactor, capacitor C and composite type rapid closing switch, described composite type rapid closing switch is comprised of Same Name of Ends opposite close coupling double winding reactor and rapid closing switch, and the two groups of opposite close coupling double winding of Same Name of Ends reactors adopt the two-level concatenation structure.In the composite type rapid closing switch, identical with embodiment 3 is: the self-induction of two winding L 1 of the opposite close coupling double winding of first order Same Name of Ends reactor and L2 is respectively L
1And L
2, mutual inductance is M, L
1=L
2The opposite close coupling double winding with first order Same Name of Ends of the structure reactor of the opposite close coupling double winding of second level Same Name of Ends reactor is similar; The first winding L 11 of the opposite close coupling double winding of second level Same Name of Ends reactor and the mutual inductance of the second winding L 12 are M
1, self-induction L
11=L
12The first winding L 11 elder generations and the rapid closing switch series connection of the opposite close coupling double winding of second level Same Name of Ends reactor, and then the second winding L 12 parallel connections of opposite close coupling double winding reactor with second level Same Name of Ends; The first winding L 1 series connection of the opposite close coupling double winding with first order Same Name of Ends of second level Same Name of Ends opposite close coupling double winding reactor reactor, then the second winding L 2 parallel connections of opposite close coupling double winding reactor with first order Same Name of Ends.As different from Example 3: branch road L21 of the identical close coupling double winding of described Same Name of Ends reactor and the series connection of the composite type rapid closing switch of two-level concatenation structure, another branch road L22 of the identical close coupling double winding of Same Name of Ends reactor and capacitor C series connection.The reactance value of composite type rapid closing switch when normal operation
By appropriate design L
1And L
2, L
12And L
22Numerical value, can make L ' is a very large value, electric current is mainly from the second branch road L of the identical close coupling double winding of Same Name of Ends reactor like this
22Flow through in the series resonant circuit that forms with C, very little on the network system impact; When network system broke down short circuit, the reactance of composite type rapid closing switch became
It is a very little reactance value; Fault current is transferred to composite type rapid closing switch branch road from capacitor C branch road, the impedance of flow restricter increases and suppresses short circuit current, and the short circuit current that rapid closing switch passes through is lower, like this can be with the lower rapid closing switch of short circuit current, cost, and reliability can improve.The one-level close coupling double winding reactor that Same Name of Ends is opposite and secondary close coupling double winding reactor, and the identical close coupling double winding reactor of Same Name of Ends all can adopt hollow, iron core or half core structure, and the composite type rapid closing switch can adopt in mechanical switch K, thyristor T, controlled triggered gap G and several switchgears of lightning arrester MOV one or more groups to compose in parallel.
As shown in figure 10, the embodiment of the invention 5 is a kind of fault current limiter based on two groups of cascaded structure composite type rapid closing switchs.The embodiment of the invention 5 is made of conventional reactor L, capacitor C and composite type rapid closing switch, described composite type rapid closing switch is comprised of Same Name of Ends opposite close coupling double winding reactor and rapid closing switch, and two groups of composite type rapid closing switchs adopt cascaded structure.Identical with embodiment 3 is: two winding L 1 of the first group of opposite close coupling double winding of Same Name of Ends reactor 1 and the self-induction of L2 are respectively L
1And L
2, mutual inductance is M, L
1=L
2The structure of the second group of opposite close coupling double winding of Same Name of Ends reactor 2 is similar with the first group of opposite close coupling double winding of Same Name of Ends reactor 1; The first winding L 11 of the second group of opposite close coupling double winding of Same Name of Ends reactor 2 and the mutual inductance of the second winding L 12 are M
1, self-induction L
11=L
12The first winding L 1 of the first group of opposite close coupling double winding of Same Name of Ends reactor 1 first and 1 series connection of the first rapid closing switch, and then with the second winding L 2 parallel connections of the first group of opposite close coupling double winding of Same Name of Ends reactor 1; The first winding L 11 of the second group of opposite close coupling double winding of Same Name of Ends reactor 2 first and 2 series connection of the second rapid closing switch, and then with the second winding L 12 parallel connections of the second group of opposite close coupling double winding of Same Name of Ends reactor.As different from Example 3: two groups of composite type rapid closing switchs do not adopt cascade system and adopt series system, and two groups the series connection of composite type rapid closing switch is rear and capacitor C is in parallel.The reactance value L ' of composite type rapid closing switch=L when normal operation
1+ L
11, by appropriate design L
1And L
2, L
12And L
22Numerical value, can make L ' is a very large value, electric current mainly flows through from the series resonance branch road that L and C form like this, and is very little on the network system impact; When network system broke down short circuit, the reactance of composite type rapid closing switch became
It is a very little reactance value; Fault current is transferred to composite type rapid closing switch branch road from capacitor C branch road, the impedance of flow restricter increases and suppresses short circuit current, and the short circuit current that rapid closing switch passes through is lower, like this can be with the lower rapid closing switch of short circuit current, cost, and reliability can improve.In addition, owing to adopt two groups of composite type rapid closing switch cascaded structures, the voltage of every group of Quick-action type closing switch also can reduce.The first group of opposite close coupling double winding of Same Name of Ends reactor 1 and the second group of opposite close coupling double winding of Same Name of Ends reactor 2 all adopt hollow, iron core or half core structure, the first rapid closing switch 1 can adopt in mechanical switch K1, thyristor T1, controlled triggered gap G1 and several switchgears of lightning arrester MOV1 one or more groups to compose in parallel, the second rapid closing switch 2 also can adopt mechanical switch K2, thyristor T2, controlled triggered gap G2 and several switchgears of lightning arrester MOV2 one or more groups compose in parallel.Need to prove that present embodiment may extend to the form of two groups of above composite type rapid closing switchs series connection, the voltage that bears of each group composite type rapid closing switch is lower like this.
As shown in figure 11, the embodiment of the invention 6 is another kind of fault current limiter based on two groups of cascaded structure composite type rapid closing switchs.Example 6 of the present invention is made of the identical close coupling double winding of Same Name of Ends reactor, capacitor C and composite type rapid closing switch, described composite type rapid closing switch is comprised of Same Name of Ends opposite close coupling double winding reactor and rapid closing switch, and two groups of composite type rapid closing switchs adopt cascaded structure.In the composite type rapid closing switch, identical with embodiment 5 is: two winding L 1 of the first group of opposite close coupling double winding of Same Name of Ends reactor 1 and the self-induction of L2 are respectively L
1And L
2, mutual inductance is M, L
1=L
2The structure of the second group of opposite close coupling double winding of Same Name of Ends reactor 2 is similar with the first group of opposite close coupling double winding of Same Name of Ends reactor 1; The first winding L 11 of the second group of opposite close coupling double winding of Same Name of Ends reactor 2 and the mutual inductance of the second winding L 12 are M
1, self-induction L
11=L
12The first winding L 1 of the first group of opposite close coupling double winding of Same Name of Ends reactor 1 first and 1 series connection of the first rapid closing switch, and then with the second winding L 2 parallel connections of the first group of opposite close coupling double winding of Same Name of Ends reactor 1; The first winding L 11 of the second group of opposite close coupling double winding of Same Name of Ends reactor 2 first and and 2 series connection of the second rapid closing switch, and then and the second winding L 12 parallel connections of the second group of opposite close coupling double winding of Same Name of Ends reactor 2.As different from Example 5: two groups of composite type rapid closing switchs series connection of branch road L21 of the identical close coupling double winding of described Same Name of Ends reactor and cascaded structure, another branch road L22 of the identical close coupling double winding of Same Name of Ends reactor and capacitor C series connection.The reactance value L ' of two groups of composite type rapid closing switchs=L when normal operation
1+ L
11, by appropriate design L
1And L
2, L
12And L
22Numerical value, can make L ' is a very large value, electric current is mainly from the second branch road L of the identical close coupling double winding of Same Name of Ends reactor like this
22Flow through in the series resonant circuit that forms with C, very little on the network system impact; When network system broke down short circuit, the reactance of two groups of composite type rapid closing switchs became
It is a very little reactance value; Fault current is transferred to composite type rapid closing switch branch road from capacitor C branch road, the impedance of flow restricter increases and suppresses short circuit current, and the short circuit current that rapid closing switch passes through is lower, like this can be with the lower rapid closing switch of short circuit current, cost, and reliability can improve.In addition, owing to adopt two groups of composite type rapid closing switch cascaded structures, the withstand voltage of every group of Quick-action type closing switch also can reduce.The first group of opposite close coupling double winding of Same Name of Ends reactor 1 and the second group of opposite close coupling double winding of Same Name of Ends reactor 2 all adopt hollow, iron core or half core structure, the first rapid closing switch 1 can adopt in mechanical switch K1, thyristor T1, controlled triggered gap G1 and several switchgears of lightning arrester MOV1 one or more groups to compose in parallel, the second rapid closing switch 2 also can adopt mechanical switch K2, thyristor T2, controlled triggered gap G2 and several switchgears of lightning arrester MOV2 one or more groups compose in parallel.Need to prove that present embodiment also may extend to the pattern of two groups of above composite type rapid closing switchs series connection, the voltage that bears of each group composite type rapid closing switch is lower like this.
Claims (7)
1. the fault current limiter based on the composite type rapid closing switch is characterized in that, described fault current limiter is made of conventional reactor or the identical close coupling reactor of Same Name of Ends, capacitor (C) and composite type rapid closing switch; Described composite type rapid closing switch is connected with conventional reactor (L) with the first parallel connection of capacitor (C) again, perhaps a branch road (L21) of the identical close coupling double winding of Same Name of Ends reactor is connected with the composite type rapid closing switch, and another branch road (L22) of the identical close coupling double winding of Same Name of Ends reactor is connected with capacitor (C).
2. according to fault current limiter claimed in claim 1, it is characterized in that described composite type rapid closing switch is comprised of Same Name of Ends opposite close coupling double winding reactor and rapid closing switch; The identical close coupling double winding of described Same Name of Ends reactor is comprised of hollow, closure or the semi-closed iron core of the first winding, the second winding and rectangle, and described the first winding is identical with the number of turn of the second winding, is wound on the stem stem with parallel way; The opposite close coupling double winding of the Same Name of Ends reactor that forms described composite type rapid closing switch is comprised of hollow, closure or the semi-closed iron core of the first winding, the second winding and rectangle, described the first winding is identical with the number of turn of the second winding, is wound on the stem stem in the inverse parallel mode; Described fault current limiter is connected in the network system.
3. according to fault current limiter claimed in claim 1, it is characterized in that described composite type rapid closing switch is connected with conventional reactor (L) with the first parallel connection of capacitor (C) again; When normal operation, the composite type rapid closing switch is large impedance state, electric current mainly flows through from the circuit that conventional reactor (L) and capacitor (C) are composed in series, conventional reactor (L) and capacitor (C) form series resonant circuit and be low impedance state, and be very little on the network system impact; When network system broke down short circuit, the composite type rapid closing switch was little impedance state, and short circuit current is transferred to the rapid closing switch branch road from capacitor (C) branch road, and the impedance of whole network system increases, and short circuit current descends.
4. according to fault current limiter claimed in claim 1, it is characterized in that, in the described fault current limiter, a branch road (L21) of the identical close coupling double winding of Same Name of Ends reactor is connected with the composite type rapid closing switch, and another branch road (L22) of the identical close coupling double winding of Same Name of Ends reactor is connected with capacitor (C); When normal operation, the composite type rapid closing switch is large impedance state, electric current flows through from the circuit that Reactor Branch (L22) and capacitor (C) are composed in series, Reactor Branch (L22) and capacitor (C) form series resonant circuit, be low impedance state, very little on the network system impact; When network system broke down short circuit, the composite type rapid closing switch was little impedance state, and short circuit current is transferred to the rapid closing switch branch road from capacitor (C) branch road, and the impedance of whole network system increases, and short circuit current descends.
5. fault current limiter according to claim 1 and 2, it is characterized in that, described composite type rapid closing switch is combined by Same Name of Ends opposite close coupling double winding reactor and rapid closing switch, the first winding (L1) elder generation of described close coupling double winding reactor and rapid closing switch series connection are then with the second winding (L2) parallel connection; Described rapid closing switch is composed in parallel by in mechanical switch (K), thyristor (T), controlled triggered gap (G) and the lightning arrester (MOV) one or more groups; When short trouble, described rapid closing switch is realized the combined floodgate to close coupling double winding reactor the first winding (L1); After the first winding (L1) was connected, the reactance that first winding (L1) of close coupling double winding reactor and the second winding (L2) produce was cancelled each other, and total reactance reduces.
6. fault current limiter according to claim 1 and 2, it is characterized in that, in the described composite type rapid closing switch, the close coupling double winding reactor that Same Name of Ends is opposite adopts the two-level concatenation mode to connect, the first winding (L11) and the rapid closing switch of secondary close coupling double winding reactor are connected first, then described the first winding (L11) and the second winding (L12) parallel connection; Described secondary close coupling double winding reactor is connected with first winding (L1) of one-level close coupling double winding reactor, then carries out parallel connection with the second winding (L2); Described rapid closing switch is composed in parallel by in mechanical switch (K), thyristor (T), controlled triggered gap (G) and the lightning arrester (MOV) one or more groups; When short trouble, rapid closing switch is realized the combined floodgate to secondary close coupling double winding reactor the first winding (L11); After the first winding (L11) conducting of secondary close coupling double winding reactor, the reactance that each branch road winding of one-level close coupling double winding and secondary close coupling double winding reactor produces is cancelled each other, and total reactance reduces.
7. fault current limiter according to claim 1 and 2 is characterized in that, in the described composite type rapid closing switch, the close coupling double winding reactor that Same Name of Ends is opposite adopts two groups of cascaded structures; First winding (L1) of first group of close coupling double winding reactor first and the series connection of the first rapid closing switch, and then with the second winding (L2) parallel connection; First winding (L11) of second group of close coupling double winding reactor first and the series connection of the second rapid closing switch, and then with the second winding (L12) parallel connection; Described the first rapid closing switch is composed in parallel by in mechanical switch (K1), thyristor (T1), controlled triggered gap (G1) and the lightning arrester (MOV1) one or more groups, and the second rapid closing switch is composed in parallel by in mechanical switch (K2), thyristor (T2), controlled triggered gap (G2) and the lightning arrester (MOV2) one or more groups; When short trouble, rapid closing switch is realized the combined floodgate to first group of close coupling double winding reactor first winding (L1) and second group of close coupling double winding reactor first winding (L11); At first winding (L1) of two groups of close coupling double winding reactors with (L11) all after the conducting, the reactance that two groups of each branch road windings of reactor produce is cancelled each other, and total reactance reduces.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310007027.9A CN103078306B (en) | 2013-01-09 | 2013-01-09 | Fault current limiter on basis of combined rapid switch-on switch |
| PCT/CN2013/089000 WO2014108010A1 (en) | 2013-01-09 | 2013-12-10 | Fault current limiter based on combined quick switching switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310007027.9A CN103078306B (en) | 2013-01-09 | 2013-01-09 | Fault current limiter on basis of combined rapid switch-on switch |
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| Publication Number | Publication Date |
|---|---|
| CN103078306A true CN103078306A (en) | 2013-05-01 |
| CN103078306B CN103078306B (en) | 2015-01-21 |
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|---|---|---|---|
| CN201310007027.9A Expired - Fee Related CN103078306B (en) | 2013-01-09 | 2013-01-09 | Fault current limiter on basis of combined rapid switch-on switch |
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| WO (1) | WO2014108010A1 (en) |
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| WO2014108010A1 (en) * | 2013-01-09 | 2014-07-17 | 中国科学院电工研究所 | Fault current limiter based on combined quick switching switch |
| CN103956719A (en) * | 2014-03-26 | 2014-07-30 | 中国科学院电工研究所 | Multi-column combination type superconductive resistance-sensitive type current limiter |
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| WO2014108010A1 (en) | 2014-07-17 |
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