CN219759356U - Current transformer - Google Patents
Current transformer Download PDFInfo
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- CN219759356U CN219759356U CN202320625757.4U CN202320625757U CN219759356U CN 219759356 U CN219759356 U CN 219759356U CN 202320625757 U CN202320625757 U CN 202320625757U CN 219759356 U CN219759356 U CN 219759356U
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- current transformer
- primary winding
- metering
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- 238000004804 winding Methods 0.000 claims abstract description 259
- 230000009466 transformation Effects 0.000 claims abstract description 63
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 3
- 238000012797 qualification Methods 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model belongs to the technical field of transformers, and discloses a current transformer. The current transformer comprises a primary winding and a secondary winding, wherein the primary winding comprises a single-turn primary winding and a multi-turn primary winding, and the single-turn primary winding and the multi-turn primary winding are arranged in series; the secondary winding comprises a large transformation ratio secondary winding and a small transformation ratio secondary winding, and the large transformation ratio secondary winding is arranged on the single-turn primary winding in a penetrating manner; the secondary winding with small transformation ratio is arranged on the multi-turn primary winding in a penetrating way; the large transformation ratio secondary winding comprises one or any combination of a first metering winding, a first measuring winding and a first protection winding; the low transformation ratio secondary winding comprises one or any combination of a second metering winding, a second measuring winding and a second protection winding. The current transformer can realize large transformation ratio span current conversion, and the volume and the weight are not greatly changed; the applicability is strong; the qualification rate is improved; the stable work is facilitated; the method can realize the combination of multiple purposes such as metering, measurement, protection and the like of current conversion under different spans.
Description
Technical Field
The utility model relates to the technical field of transformers, in particular to a current transformer.
Background
At present, current transformers are used for realizing current change by utilizing the electromagnetic induction principle of a closed iron core and a winding, so as to realize current metering, measurement, current protection and the like in the industry.
The current transformer generally comprises a primary winding and a secondary winding, the number of turns of the primary winding is smaller than that of the secondary winding, the primary winding is connected to a tested line, and rated primary current is often required to pass through the primary winding; the secondary winding has relatively more turns, so as to realize the transformation ratio conversion of current, and is generally used for metering, measuring, protecting and the like.
However, in order to realize the requirement of large-span current ratio and meet the requirement of secondary load capacity, the existing current transformer generally needs to increase the number of secondary winding turns to realize the current transformer. A way of increasing the number of secondary windings is generally used. However, in the original current transformer with small span or middle span current ratio, the secondary winding turns need to be increased in equal proportion according to the current transformation ratio relation, so that the volume and the weight of the current transformer are greatly increased, even in the process of realizing the large span current transformation ratio, the secondary winding turns obtained through proportion conversion are increased to 6000 turns or even tens of thousands turns, the secondary winding limit induced potential is further caused to be too high, the product percent of pass is reduced, the long-term stable work of the product is not facilitated, the use experience of a user is reduced, and the multi-purpose combination of the span current conversion with different transformation ratios cannot be realized.
Disclosure of Invention
The utility model aims to provide a current transformer, which has small volume and weight change while realizing large transformation ratio span current conversion; the applicability of the current transformer is improved; the qualification rate of the product is improved; the long-term stable work of the product is maintained, and the user experience is improved; the method can realize the combination of multiple purposes such as metering, measurement, protection and the like of current conversion under different spans.
To achieve the purpose, the utility model adopts the following technical scheme:
the current transformer comprises a primary winding and a secondary winding, wherein the primary winding comprises a single-turn primary winding and a multi-turn primary winding, and the single-turn primary winding and the multi-turn primary winding are arranged in series; the secondary winding comprises a large transformation ratio secondary winding and a small transformation ratio secondary winding, and the large transformation ratio secondary winding penetrates through the single-turn primary winding; the secondary winding with the small transformation ratio is arranged on the multi-turn primary winding in a penetrating way; the large transformation ratio secondary winding comprises one or any combination of a first metering winding, a first measuring winding and a first protection winding; the low transformation ratio secondary winding comprises one or any combination of a second metering winding, a second measuring winding and a second protection winding.
As an alternative to a current transformer, the single-turn primary winding and the multi-turn primary winding are arranged side by side.
As an alternative to a current transformer, when the large transformation ratio secondary winding comprises the first metering winding, the first measuring winding and the first protection winding, the first metering winding, the first measuring winding and the first protection winding are arranged side by side.
As an alternative to a current transformer, the first metering winding employs a 0.2S stage; the first measuring winding adopts 0.5 level; the first protection winding adopts 5P stages.
As an alternative to a current transformer, the first metering winding, the first measuring winding and the first protective winding are fastened by strapping or heat-shrinkable tape.
As an alternative to a current transformer, when the low transformation ratio secondary winding comprises the second metering winding, the second measuring winding and the second protection winding, the second metering winding, the second measuring winding and the second protection winding are arranged side by side and are fastened by strapping or heat-shrinkable tape.
As an alternative to a current transformer, the number of turns of the multi-turn primary winding is at least two.
As an alternative to a current transformer, the single-turn primary winding and the multi-turn primary winding are provided with terminals.
As an alternative to a current transformer, the terminals comprise wiring busbars.
As an alternative scheme of the current transformer, the current transformer further comprises a housing, the primary winding and the secondary winding are arranged on the housing, and a plurality of threaded fasteners are arranged on the housing and used for fixing the current transformer.
The beneficial effects are that:
in the utility model, the primary winding consists of a single-turn primary winding and a multi-turn primary winding, and at the moment, the large transformation ratio secondary winding is correspondingly matched with the single-turn primary winding; the secondary winding with small transformation ratio is correspondingly matched with the multi-turn primary winding; the primary winding is a combination of two windings with different turns, but the single-turn primary winding and the multi-turn primary winding are arranged in series; the current transformer is enabled to finish the conversion of large transformation ratio span current through a single-turn primary winding part, and finish the conversion of small transformation ratio span current through a multi-turn primary winding part; the current transformer can avoid the increase of the winding turns of the high transformation ratio secondary winding by times when switching the large transformation ratio span current conversion, thereby ensuring that the volume and the weight of the current transformer have little change; the current transformer has the function of switching the span currents with different transformation ratios, so that the applicability of the current transformer is improved; meanwhile, the problems that the limit induced potential is too high due to too many winding turns, long-term stable operation of the product is not facilitated, and the user experience is reduced are avoided; in addition, the large transformation ratio secondary winding further comprises one or any combination of a first metering winding, a first measuring winding and a first protection winding; the secondary winding with small transformation ratio also comprises one or any combination of a second metering winding, a second measuring winding and a second protecting winding, so that the current transformer can realize the combination of metering, measuring, protecting and other purposes under the conversion of span currents with different transformation ratios.
Drawings
Fig. 1 is a front view of a current transformer provided by an embodiment of the present utility model;
fig. 2 is a side view of a current transformer provided by an embodiment of the present utility model.
In the figure:
100. a primary winding; 110. a single turn primary winding; 120. a multi-turn primary winding;
200. a secondary winding; 210. a large transformation ratio secondary winding; 220. a small transformation ratio secondary winding;
300. a terminal;
400. a housing; 410. a threaded fastener.
Detailed Description
The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
Referring to fig. 1 and 2, the present embodiment relates to a current transformer, which includes a primary winding 100 and a secondary winding 200, the primary winding 100 includes a single-turn primary winding 110 and a multi-turn primary winding 120, and the single-turn primary winding 110 and the multi-turn primary winding 120 are serially arranged; the secondary winding 200 comprises a large transformation ratio secondary winding 210 and a small transformation ratio secondary winding 220, wherein the large transformation ratio secondary winding 210 is arranged in the single-turn primary winding 110 in a penetrating manner; the secondary winding 220 with small transformation ratio is arranged through the multi-turn primary winding 120; the large transformation ratio secondary winding 210 includes one or any combination of a first metering winding, a first measurement winding, and a first guard winding; the low transformation ratio secondary winding 220 includes one or any combination of a second metering winding, a second measurement winding, and a second protection winding.
In this embodiment, the primary winding 100 is composed of a single-turn primary winding 110 and a multi-turn primary winding 120, and at this time, the large transformation ratio secondary winding 210 is correspondingly matched with the single-turn primary winding 110; the small transformation ratio secondary winding 220 is correspondingly matched with the multi-turn primary winding 120; meanwhile, although the primary winding 100 is a combination of two windings with different turns, the single-turn primary winding 110 and the multi-turn primary winding 120 are arranged in series; the current transformer partially completes the conversion of the large transformation ratio span current through the single-turn primary winding 110, and partially completes the conversion of the small transformation ratio span current through the multi-turn primary winding 120; the current transformer can avoid the number of windings of the secondary winding multiplied when switching the large transformation ratio span current conversion, so that the volume and the weight of the current transformer are not greatly changed; the current transformer has different transformation ratio span current conversion, and the applicability of the current transformer is improved; meanwhile, too high limiting potential caused by too many winding turns is avoided, so that the product is difficult to keep stable work for a long time, and the experience of a user is reduced; in addition, in the present embodiment, the large transformation ratio secondary winding 210 further includes one or any combination of the first metering winding, the first measuring winding, and the first protection winding; the secondary winding 220 with small transformation ratio further comprises one or any combination of a second metering winding, a second measuring winding and a second protecting winding, so that multiple purposes of metering, measuring, protecting and the like of current conversion under different transformation ratio spans can be realized.
Alternatively, the single turn primary winding 110 and the multi-turn primary winding 120 are arranged side by side. In this embodiment, the primary winding 100 is led out from one end, and a certain number of turns is wound according to the design to form a multi-turn primary winding 120, and a single-turn primary winding 110 with one turn is led out in parallel from the leading-out end of the multi-turn primary winding 120, and is led out from the other end of the single-turn primary winding 110, so that the arrangement space in the product can be maximally utilized by side arrangement.
Further, when the large transformation ratio secondary winding 210 includes a first metering winding, a first measuring winding, and a first protection winding, the first metering winding, the first measuring winding, and the first protection winding are disposed side by side. The current transformer has the functions of metering, measuring, protecting and the like in large transformation ratio span current by arranging the first metering winding, the first measuring winding and the first protecting winding; further through making the three set up side by side, can make the current transformer whole compacter, the volume is littleer under the condition of guaranteeing that the three fully insulates each other.
Preferably, the first metering winding is of the 0.2S class; the first measuring winding adopts 0.5 level; the first protection winding adopts 5P stages. The first metering winding adopts 0.2S level, so that the testing range can be ensured to be wider; the first measuring winding adopts 0.5 level, so that the measuring precision is higher; the first protection winding adopts 5P level, which can make the electric induction error smaller and realize the tripping response of the short signal driving circuit breaker.
Optionally, the first metering winding, the first measuring winding and the first protection winding are fastened by strapping or heat-shrinkable tape. In order to stabilize the overall function of the large transformation ratio secondary winding 210, the first metering winding, the first measuring winding and the first protection winding can be fastened together by adopting a strapping tape or a heat-shrinkable cloth tape, wherein the strapping tape is suitable for the test stage and is easy to disassemble and assemble; the heat shrinkage cloth tape mode is more suitable for continuous production of products, so that the fixation of the large transformation ratio secondary winding 210 is firmer, and the heat shrinkage cloth tape mode is selected by a person skilled in the art according to the situation.
Alternatively, when the low transformation ratio secondary winding 220 includes a second metering winding, a second measuring winding, and a second protection winding, the second metering winding, the second measuring winding, and the second protection winding are disposed side by side and are fastened by strapping or heat-shrinkable tape. The current transformer has the functions of metering, measuring, protecting and the like in the small transformation ratio span current by arranging the second metering winding, the second measuring winding and the second protecting winding; the three parts are further arranged side by side and fastened, so that the whole current transformer is more compact, smaller in size and more stable in fixation under the condition that the three parts are fully insulated from each other.
Optionally, the number of turns of the multi-turn primary winding 120 is at least two, and under the small-span transformation ratio current, the multi-turn primary winding 120 with two or more turns can basically meet the current conversion requirement of the small-span transformation ratio, meanwhile, the current transformer can be ensured to have moderate ultimate induced potential when in use, and the service life of the product is prolonged.
Optionally, the single turn primary winding 110 and the multi-turn primary winding 120 are provided with terminals 300.
Further, the terminal 300 includes a terminal busbar.
Specifically, one of the terminals 300 of the single-turn primary winding 110 and the multi-turn primary winding 120 is an input terminal, and the other is an output terminal; in the present embodiment, the primary winding 100 is a wound copper bar, and the terminal 300 is externally connected to a circuit to be tested in a bus-bar manner.
In this embodiment, the current transformer further includes a housing 400, where the primary winding 100 and the secondary winding 200 are disposed on the housing 400, and a plurality of threaded fasteners 410 are disposed on the housing 400 to fix the current transformer. In this embodiment, the housing 400 is formed by casting epoxy resin; four threaded fasteners 410 are provided at the bottom of the housing 400 for externally connecting to a stationary table or a stationary fixture.
It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.
Claims (10)
1. The current transformer comprises a primary winding (100) and a secondary winding (200), and is characterized in that the primary winding (100) comprises a single-turn primary winding (110) and a multi-turn primary winding (120), and the single-turn primary winding (110) and the multi-turn primary winding (120) are arranged in series; the secondary winding (200) comprises a large transformation ratio secondary winding (210) and a small transformation ratio secondary winding (220), and the large transformation ratio secondary winding (210) is arranged in the single-turn primary winding (110) in a penetrating mode; the small transformation ratio secondary winding (220) is arranged on the multi-turn primary winding (120) in a penetrating way; the large transformation ratio secondary winding (210) comprises one or any combination of a first metering winding, a first measuring winding and a first protection winding; the low transformation ratio secondary winding (220) includes one or any combination of a second metering winding, a second measurement winding, and a second protection winding.
2. The current transformer of claim 1, wherein the single turn primary winding (110) and the multi-turn primary winding (120) are disposed side-by-side.
3. The current transformer of claim 2, wherein when the large transformation ratio secondary winding (210) comprises the first metering winding, a first measurement winding, and a first protection winding, the first metering winding, the first measurement winding, and the first protection winding are disposed side-by-side.
4. A current transformer according to claim 3, wherein the first metering winding is of the 0.2S order; the first measuring winding adopts 0.5 level; the first protection winding adopts 5P stages.
5. A current transformer according to claim 3, wherein the first metering winding, the first measuring winding and the first protection winding are fastened by strapping or heat-shrink tape.
6. The current transformer of claim 1, wherein when the low transformation ratio secondary winding (220) comprises the second metering winding, the second measurement winding, and the second protection winding, the second metering winding, the second measurement winding, and the second protection winding are disposed side-by-side and are fastened by strapping or heat shrink strapping.
7. The current transformer of claim 1, wherein the number of turns of the multi-turn primary winding (120) is at least two.
8. The current transformer according to claim 1, characterized in that the single turn primary winding (110) and the multi turn primary winding (120) are provided with terminals (300).
9. The current transformer of claim 8, wherein the terminals (300) comprise a wiring busbar.
10. The current transformer according to any one of claims 1-9, further comprising a housing (400), wherein the primary winding (100) and the secondary winding (200) are provided in the housing (400), and wherein a plurality of threaded fasteners (410) are provided on the housing (400) for securing the current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320625757.4U CN219759356U (en) | 2023-03-27 | 2023-03-27 | Current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320625757.4U CN219759356U (en) | 2023-03-27 | 2023-03-27 | Current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219759356U true CN219759356U (en) | 2023-09-26 |
Family
ID=88090370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320625757.4U Active CN219759356U (en) | 2023-03-27 | 2023-03-27 | Current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219759356U (en) |
-
2023
- 2023-03-27 CN CN202320625757.4U patent/CN219759356U/en active Active
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