CN219875078U - Zero-loss current limiting device - Google Patents
Zero-loss current limiting device Download PDFInfo
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- CN219875078U CN219875078U CN202320547442.2U CN202320547442U CN219875078U CN 219875078 U CN219875078 U CN 219875078U CN 202320547442 U CN202320547442 U CN 202320547442U CN 219875078 U CN219875078 U CN 219875078U
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- 230000002457 bidirectional effect Effects 0.000 claims description 23
- 230000007547 defect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to a current limiting device, in particular to a zero-loss current limiting device, which comprises a current limiting reactor L, a current limiting damper, a main short circuit bypass and an auxiliary short circuit bypass, wherein the current limiting reactor L is connected with the current limiting damper in series, and the main short circuit bypass and the auxiliary short circuit bypass are connected with the current limiting reactor L and a current limiting damper serial branch in parallel through isolating switches; the main short circuit bypass and the auxiliary short circuit bypass are used for shorting the current limiting reactor L and the current limiting damper serial branch before a short circuit fault occurs and are disconnected when the short circuit fault occurs; the technical scheme provided by the utility model can effectively overcome the defects that the current limiting reactor is directly connected in series in a loop in the prior art, has larger reactive power loss and simultaneously causes the too low voltage of the user terminal.
Description
Technical Field
The utility model relates to a current limiting device, in particular to a zero-loss current limiting device.
Background
When a short circuit fault occurs in the power system, the short circuit current is tens of times, even hundreds of times, the rated current. With the rapid increase of the electric load, the impact of the continuously increased short-circuit current on electric equipment in the electric power system is larger and larger, and meanwhile, the breaking capacity of the conventional circuit breaker is difficult to meet the requirement of breaking the huge short-circuit current.
In order to solve the problems, the mode that the current limiting reactor is connected in series in the loop is widely applied to the power transmission and distribution system. Although the mode can limit the intensity of short-circuit current, reduce the impact of the short-circuit current on electrical equipment, maintain the bus voltage, avoid further expansion of short-circuit faults, and meanwhile, have a plurality of defects in series connection of current-limiting reactors. Firstly, the current limiting reactor is connected in series in a loop to generate huge reactive power loss, so that great economic burden is caused to users; secondly, when the reactance value of the current limiting reactor is selected, the contradiction that the voltage of the user terminal is too low under the rated current after meeting the requirement of limiting the short-circuit current often exists.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects existing in the prior art, the utility model provides a zero-loss current limiting device, which can effectively overcome the defects that the current limiting reactor is directly connected in series in a loop in the prior art to have larger reactive loss and cause the voltage of a user terminal to be too low.
(II) technical scheme
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
the zero-loss current limiting device comprises a current limiting reactor L, a current limiting damper, a main short circuit bypass and an auxiliary short circuit bypass, wherein the current limiting reactor L is connected with the current limiting damper in series, and the main short circuit bypass and the auxiliary short circuit bypass are connected with the current limiting reactor L and a current limiting damper serial branch in parallel through an isolating switch;
the main short circuit bypass and the auxiliary short circuit bypass are used for shorting the current limiting reactor L and the current limiting damper serial branch before a short circuit fault occurs and are disconnected when the short circuit fault occurs.
Preferably, the main short circuit bypass comprises a fuse FU1 and a bidirectional thyristor KS1, wherein an incoming line end of the fuse FU1 is connected with a disconnecting switch QS1, an outgoing line end of the fuse FU1 is connected with a first main electrode T1 of the bidirectional thyristor KS1, and a second main electrode T2 of the bidirectional thyristor KS1 is connected with a disconnecting switch QS2.
Preferably, the main short bypass further comprises a high-speed vortex switch KO1, and the high-speed vortex switch KO1 is connected to the fuse FU1 and the bidirectional thyristor KS1 in parallel.
Preferably, the auxiliary short circuit bypass comprises a fuse FU2 and a bidirectional thyristor KS2, wherein an incoming line end of the fuse FU2 is connected with a disconnecting switch QS3, an outgoing line end of the fuse FU2 is connected with a first main electrode T3 of the bidirectional thyristor KS2, and a second main electrode T4 of the bidirectional thyristor KS2 is connected with the disconnecting switch QS4.
Preferably, the current limiting damper comprises a resistor R and an inductor L1, wherein the resistor R is connected with the inductor L1 in parallel.
(III) beneficial effects
Compared with the prior art, the zero-loss current limiting device provided by the utility model has the following beneficial effects:
1) The main short circuit bypass and the auxiliary short circuit bypass are used for shorting the current limiting reactor L and the current limiting damper serial branch before a short circuit fault occurs, and are disconnected when the short circuit fault occurs, the loss of the current limiting reactor L is zero when the power grid normally operates, the current limiting reactor L can effectively limit the short circuit current intensity when the power grid has the short circuit fault, the impact of the short circuit current on electrical equipment is reduced, and meanwhile, the loss caused by power failure can be avoided;
2) The main short circuit bypass and the auxiliary short circuit bypass are connected in parallel with the current limiting reactor L and the current limiting damper in series branch circuit through the isolating switch, so that the switching between the main short circuit bypass and the auxiliary short circuit bypass can be performed after a short circuit fault occurs, the stable operation of a power grid is ensured, and meanwhile, the main short circuit bypass and the auxiliary short circuit bypass are convenient to overhaul and replace.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a circuit diagram of the present utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
A zero-loss current limiting device is shown in figure 1, and comprises a current limiting reactor L, a current limiting damper, a main short circuit bypass and an auxiliary short circuit bypass, wherein the current limiting reactor L is connected with the current limiting damper in series, and the main short circuit bypass and the auxiliary short circuit bypass are connected with the current limiting reactor L and a current limiting damper serial branch in parallel through an isolating switch;
the main short circuit bypass and the auxiliary short circuit bypass are used for shorting the current limiting reactor L and the current limiting damper serial branch before a short circuit fault occurs and are disconnected when the short circuit fault occurs.
The main short circuit bypass comprises a fuse FU1 and a bidirectional thyristor KS1, wherein an incoming line end of the fuse FU1 is connected with a disconnecting switch QS1, an outgoing line end of the fuse FU1 is connected with a first main electrode T1 of the bidirectional thyristor KS1, and a second main electrode T2 of the bidirectional thyristor KS1 is connected with a disconnecting switch QS2.
The main short circuit bypass further comprises a high-speed vortex switch KO1, and the high-speed vortex switch KO1 is connected to the fuse FU1 and the bidirectional thyristor KS1 in parallel.
The auxiliary short circuit bypass comprises a fuse FU2 and a bidirectional thyristor KS2, wherein an incoming line end of the fuse FU2 is connected with a disconnecting switch QS3, an outgoing line end of the fuse FU2 is connected with a first main electrode T3 of the bidirectional thyristor KS2, and a second main electrode T4 of the bidirectional thyristor KS2 is connected with a disconnecting switch QS4.
The current limiting damper comprises a resistor R and an inductor L1, wherein the resistor R is connected with the inductor L1 in parallel.
When the power grid normally operates, the isolating switch QS1 and the isolating switch QS2 are closed, the high-speed vortex switch KO1, the isolating switch QS3 and the isolating switch QS4 are opened, the bidirectional thyristor KS1 is conducted at the moment, and the main short circuit bypass short circuit current limiting reactor L and the current limiting damper are connected in series.
When the power grid has slight faults, the conduction angle of the bidirectional thyristor KS1 and the equivalent impedance of the current limiting reactor L are adjusted, so that the power grid can normally operate for a period of time when the power grid has slight faults, and a certain time is provided for solving the faults.
When the power grid has short-circuit fault, the fuse FU1 fuses, the main short-circuit bypass is disconnected, and at the moment, the current limiting reactor L can effectively limit the short-circuit current intensity, so that the impact of the short-circuit current on electrical equipment is reduced. When the short-circuit fault is solved, the high-speed vortex switch KO1 is driven to be closed, at the moment, the current limiting reactor L immediately discharges the current limiting damper to release internal electric energy so as to be capable of inputting the next short-circuit fault; the isolating switches QS3 and QS4 are driven to be closed, and the high-speed vortex switch KO1, the isolating switches QS1 and QS2 are driven to be opened so as to cope with the next short-circuit fault.
When the electrical components in the main short circuit bypass need to be overhauled/replaced, the isolating switch QS1 and the isolating switch QS2 can be disconnected to carry out overhauling/replacing work of the electrical components. Similarly, when the electrical components in the sub-shorting bypass need to be overhauled/replaced, the disconnecting switches QS3 and QS4 can be turned off to perform overhauling/replacement of the electrical components.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (5)
1. A zero-loss current limiting device is characterized in that: the current limiting reactor L is connected with the current limiting damper in series, and the main short circuit bypass and the auxiliary short circuit bypass are connected with the current limiting reactor L and a current limiting damper serial branch in parallel through isolating switches;
the main short circuit bypass and the auxiliary short circuit bypass are used for shorting the current limiting reactor L and the current limiting damper serial branch before a short circuit fault occurs and are disconnected when the short circuit fault occurs.
2. The zero-loss current limiting device of claim 1, wherein: the main short circuit bypass comprises a fuse FU1 and a bidirectional thyristor KS1, wherein an incoming line end of the fuse FU1 is connected with a disconnecting switch QS1, an outgoing line end of the fuse FU1 is connected with a first main electrode T1 of the bidirectional thyristor KS1, and a second main electrode T2 of the bidirectional thyristor KS1 is connected with a disconnecting switch QS2.
3. The zero-loss current limiting device of claim 2, wherein: the main short circuit bypass further comprises a high-speed vortex switch KO1, and the high-speed vortex switch KO1 is connected to the fuse FU1 and the bidirectional thyristor KS1 in parallel.
4. The zero-loss current limiting device of claim 1, wherein: the auxiliary short circuit bypass comprises a fuse FU2 and a bidirectional thyristor KS2, wherein an incoming line end of the fuse FU2 is connected with a disconnecting switch QS3, an outgoing line end of the fuse FU2 is connected with a first main electrode T3 of the bidirectional thyristor KS2, and a second main electrode T4 of the bidirectional thyristor KS2 is connected with a disconnecting switch QS4.
5. The zero-loss current limiting device of claim 1, wherein: the current limiting damper comprises a resistor R and an inductor L1, wherein the resistor R is connected with the inductor L1 in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320547442.2U CN219875078U (en) | 2023-03-20 | 2023-03-20 | Zero-loss current limiting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320547442.2U CN219875078U (en) | 2023-03-20 | 2023-03-20 | Zero-loss current limiting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219875078U true CN219875078U (en) | 2023-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320547442.2U Active CN219875078U (en) | 2023-03-20 | 2023-03-20 | Zero-loss current limiting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219875078U (en) |
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2023
- 2023-03-20 CN CN202320547442.2U patent/CN219875078U/en active Active
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