CN102568802A - Three-phase integrated current transformer - Google Patents
Three-phase integrated current transformer Download PDFInfo
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- CN102568802A CN102568802A CN2012100077057A CN201210007705A CN102568802A CN 102568802 A CN102568802 A CN 102568802A CN 2012100077057 A CN2012100077057 A CN 2012100077057A CN 201210007705 A CN201210007705 A CN 201210007705A CN 102568802 A CN102568802 A CN 102568802A
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- iron core
- hollow bulb
- current transformer
- phase
- secondary winding
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 86
- 238000004804 winding Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000012811 non-conductive material Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 13
- 238000000819 phase cycle Methods 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 7
- 230000009897 systematic effect Effects 0.000 abstract 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- Transformers For Measuring Instruments (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
Disclosed is a three-phase integrated current transformer. An outer casing of the transformer comprises three hollow portions, the hollow portions are arranged along the X-axis of the cross section of the outer casing, an iron core wound with a secondary winding and the annular cross section is arranged outside each hollow portion, the hollow portions are surrounded by the iron cores, another iron core wound with a secondary winding and the annular cross section is arranged in the outer casing, and the iron core in the outer casing surrounds the three iron cores outside the hollow portions. By the three-phase integrated current transformer, the problems that larger mounting space is required and construction difficulty is increased due to the fact that signals for measurement or protection can be generated only on the condition that three phase-sequence current transformers are required to be mounted on a primary cable respectively and one more zero-sequence current transformer is required to be overlapped when three-phase current and zero-sequence current of a conventional feed-through type current transformer are required to be measured in systematic construction of cables are solved.
Description
Technical field
The present invention relates to a kind of electric equipment, relate in particular to a kind of three-phase integrated type current transformer.
Background technology
For a long time, current transformer is very important in an electric power system secondary device, and current transformer and transformer are very alike, and transformer mainly is used for the voltage of conversion line, and current transformer mainly is used for the electric current of conversion line.
Current transformer can also play the effect of insulation blocking except can electric current not of uniform size on the circuit being become a certain size electric current of being convenient to measure, to guarantee the safety of operating personnel and secondary relevant device.
In the construction of cable system transformation, upgrading, increase-volume project, current traditional straight-through current transformer is when installing at the scene; A current transformer (CT) can only pass through 1 cable; When the job site runs into when need measuring three-phase current and zero-sequence current, can only adopt 3 phase sequence CT to be installed on cable respectively and 1 the zero sequence CT that superposes, could realize the generation of measurement or guard signal; Totally 4 CT could solve, and need bigger installing space.
Therefore, the technical scheme of a kind of new current transformer structure of current needs solves the problems referred to above.
Summary of the invention
Technical problem to be solved by this invention provides a kind of three-phase integrated type current transformer; Solved in the construction of cable system transformation, upgrading, increase-volume project; When traditional straight-through current transformer need be measured three-phase current and zero-sequence current, can only adopt 3 phase-sequence current instrument transformers to be installed on cable respectively and 1 zero sequence current mutual inductor that superposes, could realize measuring or the generation of guard signal; Cause bigger installing space, the problem that causes difficulty of construction to increase.
In order to address the above problem; The invention provides a kind of three-phase integrated type current transformer; Comprise shell, said shell also comprises first hollow bulb, second hollow bulb and the 3rd hollow bulb, and first hollow bulb, second hollow bulb and the 3rd hollow bulb are arranged along the cross section X axle of this shell; Wherein first hollow bulb is provided with one outward and twines first iron core of secondary winding; Second hollow bulb is provided with one outward and twines second iron core of secondary winding, and the 3rd hollow bulb is provided with one outward and twines the 3rd iron core of secondary winding, and wherein the cross section of each iron core is that ring-type and iron core surround this hollow bulb; In this shell, also be provided with one and twine the 4th iron core of secondary winding, the cross section of the 4th iron core is that ring-type is while the 4th iron core surrounds first iron core, second iron core and the 3rd iron core.
Further; Above-mentioned three-phase integrated type current transformer also can comprise: said first hollow bulb, second hollow bulb are identical with the shape of the 3rd hollow bulb; And the transverse cross-sectional shape of hollow bulb is circular; Equating near the standoff distance at place of wherein adjacent two hollow bulbs,, identical and transverse cross-sectional shape iron core of the shape of first iron core, second iron core and the 3rd iron core is an annular simultaneously, and adjacent two iron cores also equates near the standoff distance at place in first iron core, second iron core and the 3rd iron core.
Further, above-mentioned three-phase integrated type current transformer also can comprise: said iron core is to mix through epoxy resin to be cast in the said shell.
Further, above-mentioned three-phase integrated type current transformer also can comprise: the material of said shell is that non-conductive material is processed.
Compared with prior art, use the present invention, phase sequence CT and zero sequence CT are integrated; To phase-sequence current and zero sequence current measurement protection demand; The installing space that integral body takies is than using 4 current transformers to reduce more than 30%, and site operation is convenient, has reduced difficulty of construction greatly; Because phase sequence CT and zero sequence CT integrate, and the iron core grounding point has become 1, earth potential is consistent, makes that the magnetic interference signal is effectively shielded simultaneously, and certainty of measurement is stable, and measurement result is reliable.
Description of drawings
Fig. 1 is the cross sectional representation of the structure of three-phase integrated type current transformer of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
As shown in Figure 1; A kind of three-phase integrated type current transformer of the present invention; Comprise shell 10; Said shell 10 also comprises first hollow bulb 11, second hollow bulb 12 and the 3rd hollow bulb 13; First hollow bulb 11, second hollow bulb 12 and the 3rd hollow bulb 13 are arranged along the cross section X axle of this shell, wherein first hollow bulb 11 outer be provided with one twine first iron core, 110, the second hollow bulbs 12 of secondary winding outer be provided with one twine secondary winding second iron core, 120 (not shown)s; The 3rd hollow bulb 13 outer the 3rd iron core 130 (not shown)s that a winding secondary winding is set; Wherein the cross section of each iron core is that ring-type and iron core surround this hollow bulb, in this shell, also be provided with one twine the 4th iron core 14, the four iron cores 14 of secondary winding the cross section be ring-type while the 4th iron core 14 is arranged on the outside of first iron core 110, second iron core 120 and the 3rd iron core 130; From the cross sectional representation of Fig. 1, the ring-type cross section of the 4th iron core 14 is the cross section shape of surrounding first iron core 110, second iron core 120 and the 3rd iron core 130.
Through the straight-through current transformer of three-phase integrated type of the present invention, to phase-sequence current and zero sequence current measurement protection demand, total solution has been proposed, made things convenient for designer's type selecting, site operation is convenient, has shortened construction period greatly.In actual use, three three-phase test cables can pass three hollow bulbs and test, and the Zero-phase current test can be tested by three three-phase test cables of the 4th iron core encirclement.
The present invention simultaneously is owing to integrate phase sequence CT and zero sequence CT, and the iron core grounding point has become 1, and earth potential is consistent, makes that the magnetic interference signal is effectively shielded, and certainty of measurement is stable, and measurement result is reliable.
Said current transformer is made up of iron core and secondary coil; Under the prerequisite that does not influence electric property; Three-phase current and zero sequence current measurement coil are installed concentratedly; And the whole installing space that takies has reduced each other because the measure error that magnetic interference causes than using 4 current transformers to reduce more than 30% simultaneously greatly.
As shown in Figure 1; First hollow bulb, second hollow bulb are identical with the shape of the 3rd hollow bulb; And the transverse cross-sectional shape of hollow bulb is circular; Equating near the standoff distance at place of wherein adjacent two hollow bulbs,, identical and transverse cross-sectional shape iron core of the shape of first iron core, second iron core and the 3rd iron core is an annular simultaneously, and adjacent two iron cores also equates near the standoff distance at place in first iron core, second iron core and the 3rd iron core.
Wherein the standoff distance of first hollow bulb, second hollow bulb and the 3rd hollow bulb equates; The most approaching standoff distance of locating of adjacent two iron cores also equates in first iron core, second iron core and the 3rd iron core simultaneously; The magnetic field that can guarantee to produce between each phase sequence CT is for uniformly; Through actual measurement, make certainty of measurement stability improve 15%.
Since iron core and secondary winding adopt the epoxide resin vacuum mixing be cast in can be fire-retardant plastic casing in, moisture proof, stable performance, Maintenance free.
Wherein, said iron core is cold rolling synthetic by the multi-disc silicon steel sheet, and wherein the thickness of every silicon steel sheet is 20um-25um, and coil is enclosed within on the iron core., when the thickness of every silicon steel sheet is 22um, both had been convenient to processing, and can have made the class of accuracy of iron core reach 0.1 through actual measurement.
Because the thin thickness of silicon steel sheet; Then its iron space factor can reach 0.88 even higher; To get well much than general iron space factor 0.85, helpful for the excitation property that improves iron core, and the excitation property of iron core quality directly influences the certainty of measurement of current transformer.
The material of said shell can be processed for non-conductive material, can be plastic or other material, wherein is preferably the PVC material.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (4)
1. three-phase integrated type current transformer; Comprise shell; It is characterized in that said shell also comprises first hollow bulb, second hollow bulb and the 3rd hollow bulb, first hollow bulb, second hollow bulb and the 3rd hollow bulb are arranged along the cross section X axle of this shell; Wherein first hollow bulb is provided with one outward and twines first iron core of secondary winding; Second hollow bulb is provided with one outward and twines second iron core of secondary winding, and the 3rd hollow bulb is provided with one outward and twines the 3rd iron core of secondary winding, and wherein the cross section of each iron core is that ring-type and iron core surround this hollow bulb; In this shell, also be provided with one and twine the 4th iron core of secondary winding, the cross section of the 4th iron core is that ring-type and the 4th iron core surround first iron core, second iron core and the 3rd iron core.
2. three-phase integrated type current transformer as claimed in claim 1; It is characterized in that; Said first hollow bulb, second hollow bulb are identical with the shape of the 3rd hollow bulb; And the transverse cross-sectional shape of hollow bulb is circular; Equating near the standoff distance at place of wherein adjacent two hollow bulbs,, identical and transverse cross-sectional shape iron core of the shape of first iron core, second iron core and the 3rd iron core is an annular simultaneously, and adjacent two iron cores also equates near the standoff distance at place in first iron core, second iron core and the 3rd iron core.
3. three-phase integrated type current transformer as claimed in claim 1 is characterized in that, said iron core is to mix through epoxy resin to be cast in the said shell.
4. three-phase integrated type current transformer as claimed in claim 1 is characterized in that, the material of said shell is that non-conductive material is processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100077057A CN102568802A (en) | 2012-01-11 | 2012-01-11 | Three-phase integrated current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100077057A CN102568802A (en) | 2012-01-11 | 2012-01-11 | Three-phase integrated current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102568802A true CN102568802A (en) | 2012-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100077057A Pending CN102568802A (en) | 2012-01-11 | 2012-01-11 | Three-phase integrated current transformer |
Country Status (1)
| Country | Link |
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| CN (1) | CN102568802A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201413768Y (en) * | 2009-04-17 | 2010-02-24 | 珠海许继电气有限公司 | Three-phase zero-sequence combined/through type current mutual inductor |
| CN201732673U (en) * | 2010-05-28 | 2011-02-02 | 李德华 | Combined current transformer for branch and division circuit breakers |
| CN201936737U (en) * | 2010-12-15 | 2011-08-17 | 深圳市阿尔派电气有限公司 | Three-phase compact combined-type current transformer |
| CN202084414U (en) * | 2010-12-20 | 2011-12-21 | 江苏美联集团有限公司 | Combined-type zero sequence current mutual inductor |
-
2012
- 2012-01-11 CN CN2012100077057A patent/CN102568802A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201413768Y (en) * | 2009-04-17 | 2010-02-24 | 珠海许继电气有限公司 | Three-phase zero-sequence combined/through type current mutual inductor |
| CN201732673U (en) * | 2010-05-28 | 2011-02-02 | 李德华 | Combined current transformer for branch and division circuit breakers |
| CN201936737U (en) * | 2010-12-15 | 2011-08-17 | 深圳市阿尔派电气有限公司 | Three-phase compact combined-type current transformer |
| CN202084414U (en) * | 2010-12-20 | 2011-12-21 | 江苏美联集团有限公司 | Combined-type zero sequence current mutual inductor |
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Application publication date: 20120711 |