CN201966596U - Stop type AC (alternating current) fault current limiter - Google Patents
Stop type AC (alternating current) fault current limiter Download PDFInfo
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- CN201966596U CN201966596U CN2011200345456U CN201120034545U CN201966596U CN 201966596 U CN201966596 U CN 201966596U CN 2011200345456 U CN2011200345456 U CN 2011200345456U CN 201120034545 U CN201120034545 U CN 201120034545U CN 201966596 U CN201966596 U CN 201966596U
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Abstract
The utility model provides a stop type AC (alternating current) fault current limiter, which is virtually a current adjusting device and comprises a positive impedance element and a break-over loop, wherein the positive impedance element is connected in series between a power supply input system and a load output system and is used for providing positive impedance; and the break-over loop is connected in parallel with the positive impedance element, is formed by a switch device and an outage element which are connected in series, and can achieve a bypass effect. In a normal power supply process, a current has no need to pass through the positive impedance element. When a short circuit fault occurs, the bypass effect of the break-over loop can be stopped through producing a short circuit large current to fuse the outage element, a fault current is output through the positive impedance element, and a positive impedance value is provided, so the equivalent internal impedance of the power supply input system is increased, the aim of limiting the fault current is achieved, a circuit breaking device of the power supply system can be smoothly isolated from the short circuit fault, the influence area of the short circuit accident is avoided from expanding, and long-time power failure is also avoided.
Description
Technical field
The utility model relates to a kind of cut-off type and exchanges fault current limiter, particularly a kind of when AC power supply system is short-circuited the device 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 (as 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 be short-circuited size of current of fault of each bus-bar loop in the design, to select the tripper of enough extinguishing arc abilities for use.
Yet, along with the increase of upstream 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, the handling safety that is related to tripper and power supply unit itself is if will update whole tripper 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 described inductor can cause the problem of voltage stability in the normal power supply process.
The utility model content
The utility model provides a kind of cut-off type to exchange fault current limiter, 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.
It is as follows that the utility model solves the problems of the technologies described above the technical scheme of being taked:
The utility model provides a kind of cut-off type to exchange fault current limiter, comprising:
At least one positive impedance element, series connection are located between power supply input system and the load output system; And
At least one conducting loop, in parallel with described positive impedance element, described conducting loop is composed in series by a derailing switch (121) and a breaking element.
According to design of the present utility model, described positive impedance element is an inductor.
According to design of the present utility model, described breaking element is a fuse.
The utility model also provides a kind of cut-off type to exchange fault current limiter, it is characterized in that, comprising:
At least one positive impedance element, series connection are located between power supply input system and the load output system; And
At least one conducting loop, in parallel with described positive impedance element, in order to the bypass effect to be provided, described conducting loop comprises a breakover element at least.
According to design of the present utility model, described positive impedance element is an inductor.
According to design of the present utility model, described breakover element is the semi-conductor type switch.
According to design of the present utility model, described conducting loop is by having at least an above breakover element to be composed in series.
The utility model provides a kind of cut-off type to exchange fault current limiter again, it is characterized in that, comprising:
At least one positive impedance element, series connection are located between power supply input system and the load output system; And
At least one conducting loop, in parallel with described positive impedance element, there is a breaking element in described conducting loop.
According to design of the present utility model, described breaking element is a fuse.
That is to say that the cut-off type that the utility model provides exchanges fault current limiter and is essentially a current adjusting device, includes at least one positive impedance element and at least one conducting loop; Described 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, described positive impedance element can be inductor, and described conducting loop is in parallel with the positive impedance element, be composed in series by a derailing switch and a breaking element, described breaking element is a fuse; Above-mentioned conducting loop can provide a bypass effect, need not pass through the positive impedance element in the normal power supply process.Produce big electric current in the overall power system fault that is short-circuited, can fuse by the bypass effect because of big electric current by breaking element, allow fault current need to export through the positive impedance element, make anti-the increasing of equivalent internal resistance of power supply input system, reach the purpose of fault current limiting, allow tripper isolate short trouble smoothly; And can be after the unshorting fault in positive impedance element several conducting loops also in parallel, the derailing switch in one of them conducting loop of conducting allows described conducting loop that the bypass effect is provided once more.
The cut-off type that the utility model provides exchanges fault current limiter and also has another structure, described conducting loop several breakover elements of serving as reasons are composed in series, described breakover element is the semi-conductor type switch, several breakover elements all are conducting state can provide the bypass effect, when the detecting of cut-off type interchange fault current limiter 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; Several conducting loops also can be on the positive impedance element in parallel, 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 also replaceable to provide the bypass effect for breaking elements such as fuses.
The utility model reduces fault current at improvement existing power supply system series reactor, produce on the problem of spread of voltage, utilize the conducting loop that the bypass effect is provided, allow 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 allow fault current increase equivalent internal resistance through the positive impedance element, reaches the purpose of limiting short-circuit current when big electric current that the fault that is short-circuited produces.
The cut-off type that the utility model provides exchanges fault current limiter, can utilize the bypass effect by the conducting loop when short trouble, allows 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 utlity model 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 energy.
Several positive impedance elements of can connecting, convenient power supply input system is done the resistance value adjustment.
Description of drawings
Fig. 1: for the utility model cut-off type exchanges fault current limiter one phase equivalent circuit sketch.
Fig. 2: be the conducting loop diagram that ends of the present utility model.
Fig. 3: be several conducting loop circuits of parallel connection of the present utility model figure.
Fig. 4: be another embodiment circuit diagram of the utility model.
Fig. 5: for another embodiment of the utility model ends breakover element figure.
Fig. 6: be another embodiment of the utility model several conducting loop circuits figure in parallel.
Fig. 7: be another simple and easy embodiment circuit diagram of the utility model.
Embodiment
Please refer to shown in Figure 1ly, the utility model cut-off type exchanges fault current limiter and is essentially a current adjusting device 1, and it includes:
One positive impedance element 11, described 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; Described positive impedance element 11 can be inductor.
One conducting loop 12, described conducting loop 12 is in parallel with positive impedance element 11, and described 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 need not pass through positive impedance element 11 in the normal power supply process; Described breaking element 122 can be fuse.
During the utility model normal operation, the derailing switch 121 in conducting loop 12 is a conducting state, make power supply input system 2 supply power to load output system 3, be connected the also normally power supply of breaker device 4 of current adjusting device 1 one sides, do not influence the power supply stability via the bypass effect in conducting loop 12; Please refer to shown in Figure 2, when being short-circuited, load output system 3 cause power-supply system to produce short circuit current, the breaking element 122 in described conducting loop 1 fuses by the bypass effect because of the big electric current that short circuit produces, allow fault current need to export and provide the positive impedance value through positive impedance element 11, make anti-the increasing of equivalent internal resistance of power supply input system 2, reach the purpose of fault current limiting, allow tripper 4 isolate short trouble smoothly, and allow 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 refer to shown in Figure 3ly, 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 several conducting loops 12 in parallel on positive impedance element 11 again, can be after the power-supply system short trouble be got rid of, the derailing switch 121 in one of them conducting loop 12 of conducting allows described conducting loop 12 that the bypass effect is provided once more, allows 2 power supplies of power supply input system not need through positive impedance element 11.
Please refer to shown in Figure 4ly, among another embodiment of the present utility model, described current adjusting device 1 includes:
One positive impedance element 11, described 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; Described positive impedance element 11 can be inductor.
One conducting loop 12, in parallel with positive impedance element 11, described conducting loop 12 has a breakover element 123 at least, can provide a bypass effect need not pass through positive impedance element 11 in the normal power supply process; Described breakover element 123 can be the semi-conductor type switch.
Among another embodiment of the present utility model, when normal operation, described breakover element 123 is a conducting state, makes power supply input system 2 supply power to load output system 3 via conducting loop 12; Please refer to shown in Figure 5, when power-supply system is short-circuited the generation Short-Circuit High Current, when 1 detecting of described current adjusting device has big electric current, promptly control breakover element 123 for ending conducting state, anti-the increasing of equivalent internal resistance that allows 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, allow tripper 4 isolate short troubles smoothly, and allow 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, allow 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, allows 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.The conducting loop 12 that please refer to another embodiment shown in Figure 6, the above-mentioned above breakover element 123 of can connecting, in turn on process if one of them form not conducting can be by the bypass effect in this conducting loop 12.Also can several conducting loops 12 are in parallel with positive impedance element 11, several conducting loops 12 of conducting after the unshorting fault can't provide the bypass effect with single breakover element 123 inefficacies of avoiding conducting loop 12 again.
Please refer to shown in Figure 7, another simple and easy embodiment of the present utility model, described matrix current adjustment circuit 1 includes:
One positive impedance element 11, described 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; Described positive impedance element 11 can be inductor.
One conducting loop 12, in parallel with positive impedance element 11, described conducting loop 12 is made up of a breaking element 122, in order to the bypass effect to be provided; Described breaking element 122 can be fuse.
Claims (9)
1. a cut-off type exchanges fault current limiter, 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); And
At least one conducting loop (12), in parallel with described positive impedance element (11), described conducting loop (12) is composed in series by a derailing switch (121) and a breaking element (122).
2. cut-off type as claimed in claim 1 exchanges fault current limiter, it is characterized in that described positive impedance element (11) is an inductor.
3. cut-off type as claimed in claim 1 exchanges fault current limiter, it is characterized in that described breaking element (122) is a fuse.
4. a cut-off type exchanges fault current limiter, 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); And
At least one conducting loop (12), in parallel with described positive impedance element (11), in order to the bypass effect to be provided, described conducting loop (12) comprises a breakover element (123) at least.
5. cut-off type as claimed in claim 4 exchanges fault current limiter, it is characterized in that described positive impedance element (11) is an inductor.
6. cut-off type as claimed in claim 4 exchanges fault current limiter, it is characterized in that described breakover element (123) is the semi-conductor type switch.
7. cut-off type as claimed in claim 4 exchanges fault current limiter, it is characterized in that described conducting loop (12) is by having at least an above breakover element (123) to be composed in series.
8. a cut-off type exchanges fault current limiter, 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); And
At least one conducting loop (12), in parallel with described positive impedance element (11), there is a breaking element (122) in described conducting loop (12).
9. cut-off type as claimed in claim 8 exchanges fault current limiter, it is characterized in that described breaking element (122) is a fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200345456U CN201966596U (en) | 2011-01-30 | 2011-01-30 | Stop type AC (alternating current) fault current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200345456U CN201966596U (en) | 2011-01-30 | 2011-01-30 | Stop type AC (alternating current) fault current limiter |
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| Publication Number | Publication Date |
|---|---|
| CN201966596U true CN201966596U (en) | 2011-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200345456U Expired - Fee Related CN201966596U (en) | 2011-01-30 | 2011-01-30 | Stop type AC (alternating current) fault current limiter |
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| CN (1) | CN201966596U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623980A (en) * | 2011-01-30 | 2012-08-01 | 易丰兴业有限公司 | Cut-off type alternating current fault current limiting circuit |
-
2011
- 2011-01-30 CN CN2011200345456U patent/CN201966596U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623980A (en) * | 2011-01-30 | 2012-08-01 | 易丰兴业有限公司 | Cut-off type alternating current fault current limiting circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110907 Termination date: 20130130 |