CN102623980A - Cut-off type alternating current fault current limiting circuit - Google Patents
Cut-off type alternating current fault current limiting circuit Download PDFInfo
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- CN102623980A CN102623980A CN2011100346769A CN201110034676A CN102623980A CN 102623980 A CN102623980 A CN 102623980A CN 2011100346769 A CN2011100346769 A CN 2011100346769A CN 201110034676 A CN201110034676 A CN 201110034676A CN 102623980 A CN102623980 A CN 102623980A
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Abstract
The invention relates to a cut-off type alternating current fault current limiting circuit, which is, in essence, a current regulating circuit. The provided circuit comprises: a positive impedance element, which is installed in series between a power supply input system and a load output system and is used for providing positive impedance; and a conduction loop, which is connected in parallel with the positive impedance element and is composed of a switch and a power-off element, thereby providing a by-pass effect. During a normal power supply process, there is no need for the conduction loop to pass through the positive impedance element. And moreover, when a short-circuit fault occurs, large short-circuit currents are generated to fuse the power-off element, so that the by-pass effect of the conduction loop can be cut off. Therefore, the fault current flows through the output of the positive impedance element and a positive impedance value is provided; the equivalent internal impedance of the power supply input system is increased; an objective of fault current limiting is achieved; and moreover, a circuit interrupting device of a power system can successfully isolate the short-circuit fault, so that it can be avoided that the influence area of the short-circuit accident is enlarged and there is a power failure for a long time.
Description
Technical field
The present invention relates to a kind of cut-off type and exchange the fault current restricting circuits, particularly a kind of when AC power supply system is short-circuited the circuit of effective fault current limiting.
Background technology
Now industrial power distribution systems is quite progressive, but because of machine or line insulation is bad, thunderbolt or reasons such as switch surging, artificial careless mistake, even future technology is progressive again, the short trouble that causes still can't be avoided fully.When fault takes place, can produce very big short circuit current, protection equipment must be isolated the machine or the circuit of fault rapidly, prevents that short circuit current from continuing circulation, reduces equipment damage and power supply interrupted district that electric power system causes because of short circuit current.
Known useful tripper (like circuit breaker or fuse etc.) is isolated short circuit current; If short circuit current is excessive, the extinguishing arc scarce capacity of tripper can't break electric arc fully and isolate short circuit current; Cause tripper to bear electric current and exceed load and cross thermal explosion, seriously jeopardize the essential safety of electricity consumption.So need to calculate earlier the size of current of each bus-bar loop failed because in the design, to select the tripper of enough extinguishing arc abilities for use.
Yet; Along with the increase of upper reaches current supply circuit and generating set and the expansion in load electricity consumption loop; Then cause the fault current of existing current supply circuit short circuit to increase; If the handling safety that is related to tripper and power supply unit itself is will be with whole tripper update performance difficulty and cost of investment height on practice; In addition, for newly putting the power supply unit planning and designing,, will cause cost of investment too high as extensively adopting the tripper of larger capacity; In power-supply system, the connect inductor of fault current limiting of general traditional improvement mode, but said inductor can cause the problem of power supply stability in the normal power supply process.
Summary of the invention
The present invention provides a kind of cut-off type to exchange the fault current restricting circuits, only uses inductor to come fault current limiting in the conventional power source system in order to overcome, and causes the shortcoming that can produce spread of voltage in the normal operation.
In order to achieve the above object, the present invention has taked following technical scheme:
The present invention provides a kind of cut-off type to exchange the fault current restricting circuits, comprising:
At least one positive impedance element, series connection are located between power supply input system and the load output system, in order to the positive impedance limiting short-circuit current to be provided; And
At least one conducting loop, parallelly connected with said positive impedance element, said conducting loop is composed in series by a derailing switch and a breaking element, in order to so that the bypass effect to be provided.
According to design of the present invention, said positive impedance element is an inductor.
According to design of the present invention, said breaking element is a fuse.
The present invention also provides a kind of cut-off type to exchange the fault current restricting circuits, comprising:
At least one positive impedance element, series connection are located between power supply input system and the load output system, in order to the positive impedance limiting short-circuit current to be provided; And
At least one conducting loop, parallelly connected with said positive impedance element, in order to so that the bypass effect to be provided, said conducting loop has a breakover element at least.
According to design of the present invention, said positive impedance element is an inductor.
According to design of the present invention, said breakover element is the semi-conductor type switch.
According to design of the present invention, said conducting loop is by having at least an above breakover element to be composed in series.
The present invention provides a kind of cut-off type to exchange the fault current restricting circuits again, comprising:
At least one positive impedance element, series connection are located between power supply input system and the load output system, in order to the positive impedance limiting short-circuit current to be provided; And
At least one conducting loop, parallelly connected with said positive impedance element, in order to the bypass effect to be provided, there is a breaking element in said conducting loop.
According to design of the present invention, said breaking element is a fuse.
That is to say that cut-off type provided by the invention exchanges the upper matrix current adjustment circuit of fault current restricting circuits essence, includes at least one positive impedance element and at least one conducting loop; Said positive impedance element connected in series is located between power supply input system and the load output system; In order to positive impedance to be provided, said positive impedance element can be inductor, and said conducting loop is parallelly connected with the positive impedance element; Be composed in series by a derailing switch and a breaking element, said breaking element is a fuse; Above-mentioned conducting loop can provide a bypass effect, in the normal power supply process, need not pass through the positive impedance element.Produce big electric current in the overall power system failed because; Can let fault current need through breaking element because of big electric current fuses by the bypass effect, make anti-the increasing of equivalent internal resistance of power supply input system through the output of positive impedance element; Reach the purpose of fault current limiting, let tripper isolate short trouble smoothly; And can be after the unshorting fault in several conducting loops of parallel connection on the positive impedance element, the derailing switch in one of them conducting loop of conducting lets said conducting loop that the bypass effect is provided once more.
Cut-off type provided by the invention exchanges the fault current restricting circuits and also has another structure; Said conducting loop several breakover elements of serving as reasons are composed in series; Said breakover element is the semi-conductor type switch, and several breakover elements all are conducting state can provide the bypass effect, when the detecting of cut-off type interchange fault current restricting circuits has the big electric current of short trouble generation; Promptly, need only one of them and form the bypass effect that not conducting can end the conducting loop by the conducting state of several breakover elements; Also can be on the positive impedance element several conducting loops of parallel connection, several conducting loops of conducting once more after the unshorting accident, the single breakover element conducting that can avoid the conducting loop was lost efficacy and the bypass effect that causes lost efficacy; Above-mentioned conducting loop is more replaceable to provide the bypass effect for breaking element such as fuse.
The present invention reduces fault current at improvement existing power supply system series reactor; But give birth on the problem of spread of voltage; Utilize the conducting loop that the bypass effect is provided, let the electric power of the direct offered load output system of power supply input system export, can not influence the stability of supply power voltage.Voluntarily by the bypass effect in conducting loop, it is anti-to let fault current increase equivalent internal resistance through the positive impedance element, reaches the purpose of limiting short-circuit current when big electric current that failed because produces.
Cut-off type provided by the invention exchanges the fault current restricting circuits, can when short trouble, utilize the bypass effect by the conducting loop, lets fault current through the positive impedance element, makes anti-the increasing of equivalent internal resistance of power supply input system; In addition, the mode that the positive impedance element can several series connection provides the positive impedance value, and convenient power supply input system is adjusted resistance value on demand.
By above-mentioned explanation, the present invention has following beneficial functional:
Bypass effect by the conducting loop, the anti-effectively limiting short-circuit current of equivalent internal resistance that collocation positive impedance element provides makes the certain isolation short circuit accident of tripper ability.
Several positive impedance elements of can connecting, convenient power supply input system is done the resistance value adjustment.
Description of drawings
Fig. 1: be to be cut-off type interchange fault current restricting circuits one phase equivalent circuit sketch of the present invention.
Fig. 2: be by the conducting loop diagram for of the present invention.
Fig. 3: be to be parallelly connected number conducting loop circuit figure of the present invention.
Fig. 4: be to be another embodiment of the present invention circuit diagram.
Fig. 5: be for another embodiment of the present invention by breakover element figure.
Fig. 6: be to be another embodiment of the present invention parallel connection number conducting loop circuit figure.
Fig. 7: be to be another simple and easy embodiment circuit diagram of the present invention.
Embodiment
Please with reference to shown in Figure 1, cut-off type of the present invention exchanges the fault current restricting circuits and is essentially a matrix current adjustment circuit 1, and it includes:
One positive impedance element 11, said positive impedance element 11 series connection are located between power supply input system 2 and the load output system 3, and the function of positive impedance limiting short-circuit current can be provided; Said positive impedance element 11 can be inductor.
One conducting loop 12, parallelly connected with positive impedance element 11, said conducting loop 12 is composed in series by a derailing switch 121 and a breaking element 122, and a bypass effect can be provided, and in the normal power supply process, need not pass through positive impedance element 11; Said breaking element 122 can be fuse.
During normal operation of the present invention; The derailing switch 121 in conducting loop 12 is a conducting state; Power supply input system 2 is supplied power to load output system 3 via the bypass effect in conducting loop 12, be connected the breaker device 4 industry normally power supplies of matrix current adjustment circuit 1 one sides, do not influence the power supply stability; Please with reference to shown in Figure 2; When load output system 3 is short-circuited, cause power-supply system to produce short circuit current, the breaking element 122 in said conducting loop 1 lets fault current need to export and provide the positive impedance value through positive impedance element 11 because of the big electric current that short circuit produces fuses by the bypass effect; Make anti-the increasing of equivalent internal resistance of power supply input system 2; Reach the purpose of fault current limiting, let tripper 4 isolate short troubles smoothly, and let the load 32 of tripper 31 isolated faults in the load output system 3; Avoid the influence area expansion of short circuit accident and cause long power failure, improve the Electrical Safety of load output system 3.Please with reference to shown in Figure 3, the positive impedance element 11 of present embodiment can be several positive impedance element connected in series and forms, and convenient power supply input system 2 is done the resistance value adjustment; And again can be after the power-supply system short trouble be got rid of in several conducting loops 12 of parallel connection on the positive impedance element 11; The derailing switch 121 in one of them conducting loop 12 of conducting once more; Let said conducting loop 12 that the bypass effect is provided, let 2 power supplies of power supply input system not need through positive impedance element 11.
Please with reference to shown in Figure 4, in the another embodiment of the present invention, said matrix current adjustment circuit 1 includes:
One positive impedance element 11, said positive impedance element 11 series connection are located between power supply input system 2 and the load output system 3, and the function of positive impedance limiting short-circuit current can be provided; Said positive impedance element 11 can be inductor.
One conducting loop 12, parallelly connected with the positive impedance element, said conducting loop 12 has a breakover element 123 at least, can provide a bypass effect in the normal power supply process, need not pass through positive impedance element 11; Said breakover element 123 can be the semi-conductor type switch.
In the another embodiment of the present invention, when normal operation, said breakover element 123 is a conducting state, and power supply input system 2 is supplied power to load output system 3 via conducting loop 12; Please with reference to shown in Figure 5; When producing Short-Circuit High Current when being short-circuited, when said matrix current adjustment circuit 1 detecting has big electric current, promptly control breakover element 123 for by conducting state in power-supply system; Anti-the increasing of equivalent internal resistance that lets fault current directly provide the positive impedance value to make power supply input system 2 via positive impedance element 11; Reach the purpose of fault current limiting, let tripper 4 isolate short troubles smoothly, and let the load 32 of tripper 31 isolated faults in the load output system 3.After the unshorting accident, promptly drop into breakover element 123 again, let power supply input system 2 once more via the 12 normal output power supplies of conducting loop.Above-mentioned running is fault current limiting effectively, lets tripper 4 and tripper 31 effectively bring into play the function of isolating short circuit, with the power supply safety of protection overall power system.Please with reference to shown in Figure 6, the conducting loop 12 of another the above-mentioned embodiment above breakover element 123 of can connecting, in turn on process as long as one of them form not conducting can be by the bypass effect in conducting loop 12.Also that several conducting loops 12 are parallelly connected with positive impedance element 11, drop into number conducting loop 12 again after the unshorting fault, losing efficacy with the single breakover element 123 of avoiding conducting loop 12 to provide the bypass effect.
Please with reference to shown in Figure 7, another simple and easy embodiment of the present invention, said matrix current adjustment circuit 1 includes:
One positive impedance element 11, said positive impedance element 11 series connection are located between power supply input system 2 and the load output system 3, and the function of positive impedance limiting short-circuit current can be provided; Said positive impedance element 11 can be inductor.
One conducting loop 12, parallelly connected with positive impedance element 11, said conducting loop 12 is made up of a breaking element 122, in order to the bypass effect to be provided; Said breaking element 122 can be fuse.
Claims (9)
1. a cut-off type exchanges the fault current restricting circuits, it is characterized in that, comprising:
At least one positive impedance element (11), series connection are located between power supply input system (2) and the load output system (3), in order to the positive impedance limiting short-circuit current to be provided; And
At least one conducting loop (12), parallelly connected with said positive impedance element (11), said conducting loop (12) is composed in series by a derailing switch (121) and a breaking element (122), in order to so that the bypass effect to be provided.
2. cut-off type as claimed in claim 1 exchanges the fault current restricting circuits, it is characterized in that said positive impedance element (11) is an inductor.
3. cut-off type as claimed in claim 1 exchanges the fault current restricting circuits, it is characterized in that said breaking element (122) is a fuse.
4. a cut-off type exchanges the fault current restricting circuits, it is characterized in that, comprising:
At least one positive impedance element (11), series connection are located between power supply input system (2) and the load output system (3), in order to the positive impedance limiting short-circuit current to be provided; And
At least one conducting loop (12), parallelly connected with said positive impedance element (11), in order to so that the bypass effect to be provided, said conducting loop (12) has a breakover element (123) at least.
5. cut-off type as claimed in claim 4 exchanges the fault current restricting circuits, it is characterized in that said positive impedance element (11) is an inductor.
6. cut-off type as claimed in claim 4 exchanges the fault current restricting circuits, it is characterized in that said breakover element (123) is the semi-conductor type switch.
7. cut-off type as claimed in claim 4 exchanges the fault current restricting circuits, it is characterized in that said conducting loop (12) is by having at least an above breakover element (123) to be composed in series.
8. a cut-off type exchanges the fault current restricting circuits, it is characterized in that, comprising:
At least one positive impedance element (11), series connection are located between power supply input system (2) and the load output system (3), in order to the positive impedance limiting short-circuit current to be provided; And
At least one conducting loop (12), parallelly connected with said positive impedance element (11), in order to the bypass effect to be provided, there is a breaking element (122) in said conducting loop (12).
9. cut-off type as claimed in claim 8 exchanges the fault current restricting circuits, it is characterized in that said breaking element (122) is a fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100346769A CN102623980A (en) | 2011-01-30 | 2011-01-30 | Cut-off type alternating current fault current limiting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100346769A CN102623980A (en) | 2011-01-30 | 2011-01-30 | Cut-off type alternating current fault current limiting circuit |
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| CN102623980A true CN102623980A (en) | 2012-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100346769A Pending CN102623980A (en) | 2011-01-30 | 2011-01-30 | Cut-off type alternating current fault current limiting circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101127440A (en) * | 2006-08-17 | 2008-02-20 | Ls产电株式会社 | Complex superconducting fault current limiter |
| US20080079412A1 (en) * | 2006-10-03 | 2008-04-03 | Shyh-Ching Huang | Voltage regulator of a DC power supply |
| CN201966596U (en) * | 2011-01-30 | 2011-09-07 | 易丰兴业有限公司 | Stop type AC (alternating current) fault current limiter |
-
2011
- 2011-01-30 CN CN2011100346769A patent/CN102623980A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101127440A (en) * | 2006-08-17 | 2008-02-20 | Ls产电株式会社 | Complex superconducting fault current limiter |
| US20080079412A1 (en) * | 2006-10-03 | 2008-04-03 | Shyh-Ching Huang | Voltage regulator of a DC power supply |
| CN201966596U (en) * | 2011-01-30 | 2011-09-07 | 易丰兴业有限公司 | Stop type AC (alternating current) fault current limiter |
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Application publication date: 20120801 |