CN213092990U - Current limiting device of transformer - Google Patents
Current limiting device of transformer Download PDFInfo
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- CN213092990U CN213092990U CN202021395456.XU CN202021395456U CN213092990U CN 213092990 U CN213092990 U CN 213092990U CN 202021395456 U CN202021395456 U CN 202021395456U CN 213092990 U CN213092990 U CN 213092990U
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Abstract
The utility model provides a transformer current limiting device, among the transformer current limiting device, installation iron core, high voltage winding and low voltage winding in the transformer oil tank, current limiting reactor establishes in the transformer oil tank and establish in series in the high voltage winding end, the both ends of current limiting reactor are drawn forth through the lead wire the transformer oil tank, and constitute transformer high pressure side neutral point with high voltage winding end pin thread connection together, the fuse is established outside the transformer oil tank, the fuse via the lead wire is parallelly connected current limiting reactor.
Description
Technical Field
The utility model relates to a transformer field, in particular to transformer current limiting device.
Background
The transformer is a junction of power transmission of a power grid and is a main device for running of the power grid, the transformer is a device for changing alternating current voltage by utilizing the principle of electromagnetic induction, and when a power transformer winding is in short circuit, especially when a load is in short circuit, the damage of huge electromagnetic force generated by fault current to the transformer winding is great, the normal use of the transformer can be influenced, and even the whole power transmission system can be influenced in serious cases.
In the existing transformer structure, in order to avoid the harm caused by the short circuit of the transformer, measures are taken to improve the short circuit strength of the transformer in the design and manufacturing process, such as keeping ampere-turn balance, strengthening the support between the winding and the core limb, increasing the number of supporting strips, improving the strength and hardness of the winding lead, the lead and the clamping piece, and the like. However, due to the cumulative effect of short-circuit, the short-circuit strength of the winding is reduced after multiple short-circuit current surges, so that short-circuit failure may still occur. And secondly, the short-circuit current is limited by adopting a mode of improving short-circuit impedance or externally connecting a current-limiting reactor, the operation loss of the mode is large, the bus voltage is increased along with the fluctuation of the load, the problem of electric energy quality is caused, and the operation mode of a power grid is limited. Thirdly, a fault current limiter is additionally arranged. At present, fault current limiters are mainly divided into superconducting type, power electronic type and conventional equipment type current limiters. The superconducting and power electronic fault current limiters are high in manufacturing cost and high in operating cost, and conventional equipment type current limiters can be divided into a resonant type, an arc transfer type and a fast switch type according to the principle. The resonant current limiter has the advantages that through-flow occurs in capacitance and inductance elements when the resonant current limiter normally operates, so that the loss is large, the arc transfer current limiter depends on short-circuit fault rapid identification and artificial zero-crossing technologies, the structure is complex, the reliability is low, the rapid switch current limiter limits current after the short-circuit current naturally crosses zero, the first peak value of the short-circuit current cannot be limited, the current limiting effect is poor, all fault current limiters are the same as a current limiting reactor, a large installation position is needed during actual use, and the current limiters are more and more limited under the conditions that the occupied area of a transformer substation is smaller and smaller, and. In summary, under the condition that the installation floor area is limited by the size, a current limiting device which is small in size, convenient to install and maintain, free of increasing operation loss and good in current limiting effect is urgently needed, and no economic and reliable technical measure is provided for limiting the short-circuit current of the transformer at present.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
SUMMERY OF THE UTILITY MODEL
To the not enough or defect that above-mentioned prior art exists, the utility model aims to provide a transformer current limiting device establishes current-limiting reactor in the transformer tank, when short-circuit fault takes place, can be in short-circuit current limit short-circuit current before not reaching the peak value yet, avoid the transformer to suffer big short-circuit current and strike to very big accumulative effect that has alleviateed the short circuit avoids suffering short-circuit impact damage, has improved the life-span of transformer, has reduced the burden of relevant circuit breaker cut-off short-circuit current, and it is convenient to maintain, not increase loss.
The purpose of the utility model is realized by the following technical scheme.
A current limiting device for a transformer comprises a current limiting device,
the transformer oil tank is internally provided with an iron core, a high-voltage winding and a low-voltage winding,
the current-limiting reactor is arranged in the transformer oil tank and is connected in series with the tail end of the high-voltage winding, two ends of the current-limiting reactor are led out of the transformer oil tank through leads and are connected with the leads at the end of the high-voltage winding to form a neutral point at the high-voltage side of the transformer,
and the fuse is arranged outside the transformer oil tank and is connected with the current limiting reactor in parallel through a lead.
In the transformer current limiting device, a medium-voltage winding is also arranged in a transformer oil tank.
In the transformer current limiting device, a zinc oxide arrester is connected with the fuse in parallel.
In the transformer current limiting device, a zinc oxide arrester is arranged outside the transformer oil tank.
In the transformer current limiting device, the current limiting reactor comprises an air core current limiting reactor.
In the transformer current limiting device, the current limiting reactor is fixed by an iron core clamping piece of the transformer, and an insulating piece is arranged between the iron core clamping piece and the current limiting reactor in a cushioning mode.
In the transformer current limiting device, the current limiting reactor is a single-phase current limiting reactor.
In the transformer current limiting device, both ends of the current limiting reactor are led out from the wall of the transformer oil tank through leads.
In the transformer current limiting device, the lead wire passes through the wall of the transformer oil tank through an insulating sleeve and is led out.
The utility model discloses limit transformer short-circuit current, and do not increase the running loss, improve economic benefits. The utility model discloses simple structure, the control technique that does not need to be complicated have quick, automatic current limiting function, and the reliability is high. The utility model discloses compact structure does not need extra installation place, consequently has comparatively extensive application prospect.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the technical means of the present invention is implemented to the extent that those skilled in the art can implement the technical solutions according to the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following description is given by way of example of the embodiments of the present invention.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort. Also, like parts are designated by like reference numerals throughout the drawings.
In the drawings:
fig. 1 is a schematic structural diagram of a current limiting device for a transformer according to an embodiment of the present invention.
The invention is further explained below with reference to the drawings and examples.
Detailed Description
A specific embodiment of the present invention will be described in more detail below with reference to fig. 1. While specific embodiments of the invention are shown in the drawings, it will be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The following description is of the preferred embodiment of the invention, and is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the invention. The protection scope of the present invention is subject to the limitations defined by the appended claims.
In order to facilitate understanding of the embodiments of the present invention, the following description will be given by way of example of several specific embodiments with reference to the accompanying drawings, which do not limit the embodiments of the present invention.
Fig. 1 is a schematic structural diagram of a transformer current limiting device according to an embodiment of the present invention, which will be specifically described with reference to fig. 1.
As shown in fig. 1, a current limiting apparatus for a transformer includes,
a transformer oil tank 6, wherein an iron core 7, a high-voltage winding 1 and a low-voltage winding 5 are arranged in the transformer oil tank,
and the current-limiting reactor 2 is arranged in the transformer oil tank 6 and is connected in series with the tail end of the high-voltage winding 1. Furthermore, two ends of the current-limiting reactor 2 are led out from the wall of the transformer oil tank 6 through leads and are connected with a high-voltage winding end lead to form a transformer high-voltage side neutral point,
and a fuse 3 provided outside the transformer tank 6, the fuse 3 being connected in parallel to the current limiting reactor 2 via the lead wire, wherein the fuse 3 is opened when a short-circuit current is generated in the high-voltage winding 1 and the low-voltage winding 5.
Further, a zinc oxide arrester 4 is arranged outside the transformer oil tank 6, and the zinc oxide arrester 4 is connected with the fuse 3 in parallel.
The utility model discloses compact structure is applicable to the installation and takes up an area of the condition that receives size limitation, and installs and maintain conveniently, does not increase the running loss, has avoided busbar voltage to increase along with the load fluctuation and brings the electric energy quality problem, does not restrict electric wire netting operational mode, and the current-limiting is effectual simultaneously, and is economical and reliable.
In the preferred embodiment of the transformer current limiting device, a medium-voltage winding is further arranged in the transformer oil tank 6.
In the preferred embodiment of the current limiting device for the transformer, the current limiting reactor 2 is a single-phase current limiting reactor 2. For a three-phase transformer, the current-limiting reactors 2 are three single-phase reactors.
In the preferred embodiment of the transformer current limiting device, the current limiting reactor 2 comprises an air core current limiting reactor 2.
In a preferred embodiment of the current limiting device of the transformer, the current limiting reactor 2 is fixed by a core clamp of the transformer, and an insulating member is padded between the core clamp and the current limiting reactor 2.
In a preferred embodiment of the current limiting device for the transformer, the insulating member is made of rubber.
In the preferred embodiment of the transformer current limiting device, the fuse 3 opens within a few milliseconds when short-circuit current is generated in the high-voltage winding 1 and the low-voltage winding 5.
In the preferred embodiment of the transformer current limiting device, when the high-voltage winding 1 and the low-voltage winding 5 generate short-circuit current, before the short-circuit current does not reach the peak value of the first half wave, the fuse 3 is opened to connect the current limiting reactor 2 to the high-voltage winding 1.
In the preferred embodiment of the transformer current limiting device, the lead wire is led out through the wall of the transformer oil tank 6 through an insulating sleeve.
In the preferred embodiment of the transformer current limiting device, the lead wire is led out through the wall of the transformer oil tank 6 through a basin insulator.
In order to further understand the utility model discloses, in an embodiment, except placing transformer winding and unshakable in one's determination in transformer tank 6, will satisfy current-limiting requirement's current-limiting reactor 2 and place high-voltage fuse 3 and zinc oxide subassembly outside oil tank 6 in oil tank 6. The current limiting reactor 2, the high-voltage fuse 3 and the zinc oxide component are electrically connected in parallel. Structurally, two ends of the current limiting reactor 2 are led out through a lead and a sleeve and are connected with the high-voltage fuse 3 and the zinc oxide component. The utility model discloses utilize the reactance of current-limiting reactor 2 to reduce the short-circuit current under the short-circuit fault, utilize high-voltage fuse 3's quick breaking capacity, timely input current-limiting reactor 2 when breaking down, normal during operation, current-limiting reactor 2 is by 3 short circuits of high-voltage fuse, and the loss of transformer does not increase, the utility model is suitable for a counterwork short-circuit capacity has higher requirement or has the manufacturing of the transformer of restriction requirement to installation site short-circuit current.
In one embodiment, the transformer current limiting device comprises a transformer oil tank 6, an iron core 7, a high-voltage winding 1 and a low-voltage winding 6 are arranged in the transformer oil tank 6, and the technology also comprises a medium-voltage winding and a current limiting reactor 2 when the technology is used for a three-winding transformer. The fuse 3 and the zinc oxide arrester 4 are arranged outside the transformer oil tank 6. The current-limiting reactor 2 is connected with the tail end of the transformer high-voltage winding 1, and both ends of the current-limiting reactor are led out from the wall of the transformer oil tank 6 through leads. The fuse 3 is connected with the zinc oxide arrester 4 in parallel, and two ends of the fuse are connected with the lead of the current limiting reactor 2. The current limiting reactor 2 is a hollow current limiting reactor and is arranged in the transformer oil tank 6.
In one embodiment, the current limiting reactor 2, the fuse 3 and the zinc oxide arrester 4 are electrically connected in parallel.
In one embodiment, when the external short-circuit fault occurs to the low-voltage winding 5 during the operation of the transformer, the low-voltage winding 5 and the high-voltage winding 1 of the corresponding phase generate short-circuit current, and the fuse 3 is switched on and off within a few millimeters due to the extremely steep current rising rate and the extremely high current density of the short-circuit current, so that the current-limiting reactor 2 is connected to the high-voltage winding 1 when the short-circuit current does not reach the first half-wave peak value, and the short-circuit current is limited.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments and application fields, and the above-described embodiments are illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.
Claims (9)
1. A current limiting device of a transformer is characterized by comprising a current limiting device,
the transformer oil tank is internally provided with an iron core, a high-voltage winding and a low-voltage winding,
the current-limiting reactor is arranged in the transformer oil tank and is connected in series with the tail end of the high-voltage winding, two ends of the current-limiting reactor are led out of the transformer oil tank through leads and are connected with the leads at the end of the high-voltage winding to form a neutral point at the high-voltage side of the transformer,
and the fuse is arranged outside the transformer oil tank and is connected with the current limiting reactor in parallel through a lead.
2. The transformer current limiting device according to claim 1, wherein: and a medium-voltage winding is also arranged in the transformer oil tank.
3. The transformer current limiting device according to claim 1, wherein: the zinc oxide arrester is connected with the fuse in parallel.
4. The transformer current limiting device according to claim 3, wherein: the zinc oxide arrester is arranged outside the transformer oil tank.
5. The transformer current limiting device according to claim 1, wherein: the current limiting reactor comprises an air core current limiting reactor.
6. The transformer current limiting device according to claim 1, wherein: the current-limiting reactor is fixed by an iron core clamping piece of the transformer, and an insulating piece is arranged between the iron core clamping piece and the current-limiting reactor in a cushioning mode.
7. The transformer current limiting device according to claim 1, wherein: the current limiting reactor is a single-phase current limiting reactor.
8. The transformer current limiting device according to claim 1, wherein: and two ends of the current-limiting reactor are led out from the wall of the transformer oil tank through leads.
9. The transformer current limiting device according to claim 8, wherein: the lead is led out through the wall of the transformer oil tank through an insulating sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021395456.XU CN213092990U (en) | 2020-07-15 | 2020-07-15 | Current limiting device of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021395456.XU CN213092990U (en) | 2020-07-15 | 2020-07-15 | Current limiting device of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213092990U true CN213092990U (en) | 2021-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021395456.XU Active CN213092990U (en) | 2020-07-15 | 2020-07-15 | Current limiting device of transformer |
Country Status (1)
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|---|---|
| CN (1) | CN213092990U (en) |
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2020
- 2020-07-15 CN CN202021395456.XU patent/CN213092990U/en active Active
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