CN205039036U - Wide -range current transformer - Google Patents
Wide -range current transformer Download PDFInfo
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- CN205039036U CN205039036U CN201520755041.1U CN201520755041U CN205039036U CN 205039036 U CN205039036 U CN 205039036U CN 201520755041 U CN201520755041 U CN 201520755041U CN 205039036 U CN205039036 U CN 205039036U
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- iron core
- current transformer
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000004804 winding Methods 0.000 claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000005415 magnetization Effects 0.000 abstract description 2
- 239000011162 core material Substances 0.000 description 25
- 238000004458 analytical method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Abstract
The utility model provides a wide -range current transformer, wherein the mutual -inductor structure includes primary winding, secondary winding and iron core, the iron core comprises fixed iron core and movable iron core, movable iron core takes out from forming the air gap from the mutual -inductor, simple structure is convenient for realize, when current transformer primary current was great, the gas length is adjusted to the accessible makeed the magnetization curve of iron core be located the linearity region, has effectively solved because the core saturation leads to the problem of error increase, has reduced the iron core loss.
Description
Technical field
The utility model belongs to current transformer field, particularly relates to a kind of structure widening current transformer range by changing iron core air gap length.
Background technology
Current transformer is widely used in electric power system generating, transmission of electricity, power transformation, joins in the electric energy metrical of each link, and the big current of primary side is converted into unified secondary side small area analysis, and the quality of its performance greatly affects the accuracy of metering and observing and controlling.Due to the size of current great disparity, from a few peace to a little Wan An not etc. of electrical network different location, different time sections; for the ease of measuring, protect and controlling; current transformer often needs the primary current scope difference according to measuring to formulate different no-load voltage ratios, thus makes secondary current within prescribed limit.
If do not consider core sataration, ratio and first and second umber of turn of primary side current and secondary side current are inversely proportional to.Therefore, traditional current transformer often arranges multiple tap at secondary winding diverse location place, so that select different no-load voltage ratios for different measuring object.But in practice, be subject to the restriction of the factors such as core material, when the current transformer of secured core structure is often difficult to ensure big current no-load voltage ratio and small area analysis no-load voltage ratio simultaneously, its measurement tasks point is all in the close linear zone of iron core magnetic, thus causes measurement result inaccurate, affects certainty of measurement.Research and analyse known, when iron core magnetic is close too small or close to time saturated, the working point of current transformer all may enter iron core nonlinear characteristic region, not only make secondary current waveform distort, and current amplitude also can be affected, produce comparatively big error.
Utility model content
The utility model is in order to solve the above-mentioned defect and deficiency that exist in prior art, provide a kind of wide-range current transformer, when ensureing that primary current is maximum by regulating gas length, iron core magnetic flux density is still no more than saturation value, and core characteristics is positioned at the range of linearity all the time.
For solving the problems of the technologies described above, the utility model provides a kind of wide-range current transformer, and comprise winding, secondary winding and an iron core, described iron core is made up of secured core and movable core, and described movable core detaches formation air gap from instrument transformer.
Preferably, described movable core comprises at least 1 piece of movable core unit, and described movable core unit detaches formation air gap from instrument transformer.
Preferably, described movable core unit number is that current transformer range number subtracts 1, and wherein current transformer range number is at least 2.
The Advantageous Effects that the utility model reaches: the current transformer of a kind of wide-range that the utility model proposes, structure is simple, be convenient to realize, when primary current is larger, the magnetization curve of iron core is made to be positioned at the range of linearity by regulating gas length, efficiently solve the problem because core sataration causes error to increase, decrease core loss.
Accompanying drawing explanation
Fig. 1 the utility model current transformer structure schematic diagram;
Fig. 2 the utility model specific embodiment air-gap-free current transformer and the secondary current, the primary current curve comparison figure that have air gap current transformer.
Embodiment
In order to the technique effect can better understanding technical characteristic of the present utility model, technology contents and reach, now accompanying drawing of the present utility model is described in detail in conjunction with the embodiments.
Below in conjunction with drawings and Examples, the utility model patent is further illustrated.
As shown in Figure 1, the utility model provides a kind of wide-range current transformer, comprise winding 1, secondary winding 2 and an iron core, described iron core is made up of secured core 3 and movable core 4, the length of movable core 4 and number can be arranged according to actual needs, and therefore, it is also changed that described movable core 4 detaches from instrument transformer the length forming air gap 5, when ensure that primary current is maximum, iron core magnetic flux density is still no more than saturation value, and core characteristics is positioned at the range of linearity all the time.Preferably, described movable core 4 comprises at least 1 piece of movable core unit 40, and like this, when the movable core unit 40 detaching varying number can obtain different gas lengths, structure is simple, handled easily.
Specific embodiment:
In order to verify the effect of a kind of wide-range current transformer that the utility model provides, what utilize Finite Element Method to carry an air-gap-free core structure current transformer and the utility model carries out modeling and simulation containing certain air-gap iron core structure current transformer, wherein containing air-gap iron core structure current transformer by detaching the gas length of movable core unit acquisition is 5mm, comparing result as shown in Figure 2, compared to air-gap-free iron core current transformer, the core structure containing certain air gap utilizing the utility model to propose, secondary current can be made to become wider with the range of linearity of the ratio of primary current, avoid the current transformer nonlinear characteristic that core sataration brings when primary current is larger.
Below disclose the utility model with preferred embodiment, so itself and be not used to limit the utility model, allly take equivalent replacement or technical scheme that the scheme of equivalent transformation obtains, all drop in protection range of the present utility model.
Claims (3)
1. a wide-range current transformer, is characterized in that: comprise winding, secondary winding and an iron core, described iron core is made up of secured core and movable core, and described movable core detaches formation air gap from instrument transformer.
2. wide-range current transformer according to claim 1, is characterized in that: described movable core comprises at least 1 piece of movable core unit, and described movable core unit detaches formation air gap from instrument transformer.
3. wide-range current transformer according to claim 2, is characterized in that: described movable core unit number is that current transformer range number subtracts 1, and wherein current transformer range number is at least 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520755041.1U CN205039036U (en) | 2015-09-25 | 2015-09-25 | Wide -range current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520755041.1U CN205039036U (en) | 2015-09-25 | 2015-09-25 | Wide -range current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205039036U true CN205039036U (en) | 2016-02-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520755041.1U Active CN205039036U (en) | 2015-09-25 | 2015-09-25 | Wide -range current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205039036U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105161258A (en) * | 2015-09-25 | 2015-12-16 | 国家电网公司 | Wide-range current transformer and gas gap length calculation method |
| CN106443154A (en) * | 2016-09-23 | 2017-02-22 | 国网江西省电力公司电力科学研究院 | Current and voltage ratio transformation and sampling device |
| CN106910596A (en) * | 2017-02-28 | 2017-06-30 | 南通壹选工业设计有限公司 | One kind prevents oversaturated current transformer |
| CN107741518A (en) * | 2017-11-15 | 2018-02-27 | 国网辽宁省电力有限公司鞍山供电公司 | A kind of cable shaft earth current test device of more opening joint testing currents |
-
2015
- 2015-09-25 CN CN201520755041.1U patent/CN205039036U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105161258A (en) * | 2015-09-25 | 2015-12-16 | 国家电网公司 | Wide-range current transformer and gas gap length calculation method |
| CN106443154A (en) * | 2016-09-23 | 2017-02-22 | 国网江西省电力公司电力科学研究院 | Current and voltage ratio transformation and sampling device |
| CN106443154B (en) * | 2016-09-23 | 2020-02-28 | 国网江西省电力公司电力科学研究院 | Current and voltage proportional transformation and sampling device |
| CN106910596A (en) * | 2017-02-28 | 2017-06-30 | 南通壹选工业设计有限公司 | One kind prevents oversaturated current transformer |
| CN107741518A (en) * | 2017-11-15 | 2018-02-27 | 国网辽宁省电力有限公司鞍山供电公司 | A kind of cable shaft earth current test device of more opening joint testing currents |
| CN107741518B (en) * | 2017-11-15 | 2023-12-19 | 国网辽宁省电力有限公司鞍山供电公司 | Cable well grounding current testing device for multi-opening combined current testing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |