CN101728075A - Hollow mutual inductor for high-voltage switch - Google Patents
Hollow mutual inductor for high-voltage switch Download PDFInfo
- Publication number
- CN101728075A CN101728075A CN200810201500A CN200810201500A CN101728075A CN 101728075 A CN101728075 A CN 101728075A CN 200810201500 A CN200810201500 A CN 200810201500A CN 200810201500 A CN200810201500 A CN 200810201500A CN 101728075 A CN101728075 A CN 101728075A
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- induction coil
- hollow
- mutual inductor
- voltage switch
- sampling circuit
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Abstract
The invention provides a hollow mutual inductor for a high-voltage switch. The hollow mutual inductor for high-voltage switch consists of an induction coil, a hollow framework and a sampling circuit, wherein the induction coil is wound on the hollow framework; the sampling circuit is provided with a signal input end and a grounding terminal inside; the periphery of the induction coil is covered by a copper foil shielding layer; an output end of the induction coil is connected with a twisted-pair shielded wire; the copper foil shielding layer is connected with the grounding terminal of the sampling circuit via a lead; a signal wire in the twisted-pair shielded wire is connected with a signal input end of the sampling circuit; and a shielding layer in the twisted-pair shielded wire is connected with the grounding terminal of the sampling circuit. In the hollow mutual inductor, the periphery of the induction hollow coil in the hollow mutual inductor is provided with the shielding layer; a signal is output from the twisted-pair shielded wire; and the shielding layer is connected with the grounding terminal of the sampling circuit. Therefore, the hollow mutual inductor for the high-voltage switch can effectively eliminate differential mode interference caused by high voltage and ensure stable output of the signal sampling circuit so that the high-voltage switch works stably.
Description
Technical field:
The present invention relates to electricity field, relate in particular to mining magnetic starter, particularly mining magnetic starter switch, concrete is a kind of hollow mutual inductor that is used for high-voltage switch gear.
Background technology:
In the prior art, the electronic type hollow coil current transformers that adopt in the mining magnetic starter more, wherein do not contain iron core, overcome that core type current transformer volume is big, the shortcoming of magnetic saturation and ferro resonance, the electronic type hollow coil current transformer uses more in mining low tension switch, but basic not use in the mining high-voltage switch of 6KV, 10KV.Reason be since hollow mutual inductor output be the voltage signal of mV level, in high voltage flame proof switch, very easily be subjected to the interference of high pressure, on transmission line, cause serious differential mode interference, cause the disorder of output signal, directly influence the performance of protective device.
Summary of the invention:
The object of the present invention is to provide a kind of hollow mutual inductor that is used for high-voltage switch gear, the described this hollow mutual inductor that is used for high-voltage switch gear will solve prior art mesohigh signal the output signal of hollow mutual inductor is caused interference, influences the technical problem of protective device job stability.
This hollow mutual inductor of high-voltage switch gear that is used for of the present invention is by induction coil, hollow skeleton and sample circuit constitute, described induction coil is wound on the described hollow skeleton, be provided with signal input part and earth terminal in the described sample circuit, wherein, the periphery of described induction coil is coated with a Copper Foil screen, the output of induction coil is connected with the multiple twin shielding conductor, described Copper Foil screen is connected with the earth terminal of described sample circuit by a lead, holding wire in the described multiple twin shielding conductor is connected with the signal input part of sample circuit, and the screen in the multiple twin shielding conductor is connected with the earth terminal of sample circuit.
Further, the line of described induction coil directly is 0.14mm, and the number of turn is 2700 circles.
Further, described induction coil is an air core solenoid.
Concrete, induction coil described in the present invention, hollow skeleton, sample circuit, Copper Foil screen and multiple twin shielding conductor all adopt known schemes of the prior art, about induction coil, hollow skeleton, sample circuit, Copper Foil screen and multiple twin shielding conductor known schemes in the prior art, those skilled in the art all understands, does not repeat them here.
Operation principle of the present invention is: the screen that induction coil is outer and the screen of multiple twin shielding conductor all are connected with the earth terminal of sample circuit, can effectively eliminate the differential mode interference that high pressure causes when therefore the amplifier in sample circuit amplifies output signal on signal transmssion line.
The present invention compares with prior art, and its effect is actively with tangible.The induction air core coil periphery of the present invention in hollow mutual inductor is provided with screen, utilize multiple twin shielding conductor output signal, screen all links to each other with the earth terminal of sample circuit, can effectively eliminate the differential mode interference that high pressure brings, the output that guarantees signal sample circuit is stable, thereby makes the high-voltage switch gear working stability.
Description of drawings:
Fig. 1 is the schematic diagram of an embodiment of a kind of hollow mutual inductor that is used for high-voltage switch gear of the present invention.
Embodiment:
Embodiment 1:
As shown in Figure 1, the hollow mutual inductor of high-voltage switch gear that is used for of the present invention is by induction coil 1, hollow skeleton and sample circuit 2 constitute, described induction coil 1 is wound on the described hollow skeleton, be provided with signal input part and earth terminal in the described sample circuit 2, wherein, the periphery of described induction coil 1 is coated with a Copper Foil screen 11, the output of induction coil 1 is connected with multiple twin shielding conductor 12, described Copper Foil screen 11 is connected with the earth terminal of described sample circuit 2 by a lead, holding wire in the described multiple twin shielding conductor 12 is connected with the signal input part of sample circuit 2, and the screen 13 in the multiple twin shielding conductor 12 is connected with the earth terminal of sample circuit 2.
Further, the line of described induction coil 1 directly is 0.14mm, and the number of turn is 2700 circles.
Further, described induction coil 1 is an air core solenoid.Adopt the Rogowski induction coil in the present embodiment.
Concrete, tested electric current 3 is perpendicular to induction coil 1 plane and be positioned at the center of induction coil 1.
If n is the number of turn on induction coil 1 unit length, S is induction coil 1 sectional area, and then the magnetic linkage on 1 section of the induction coil is:
dφ＝u
0SnH·dl
In the formula: H is the magnetic field intensity at induction coil 1dl section place.
The magnetic linkage of whole induction coil 1 is:
φ＝∫u
0SnH·dl
If the n and the S at induction coil 1 place are even,, have according to circuital law
φ＝∫u
0SnH·dl＝u
0Sn∫H·dl＝u
0Sni
If i is an alternating current, then the induced electromotive force of induction coil 1 is:
By following formula as can be known the induced electromotive force e (t) of Rogowski induction coil 1 be directly proportional with the differential of tested electric current 3, utilize integrated circuit 21 pairs of outputs carrying out integral transformation just can try to achieve tested electric current 3.
Claims (3)
1. hollow mutual inductor that is used for high-voltage switch gear, by induction coil, hollow skeleton and sample circuit constitute, described induction coil is wound on the described hollow skeleton, be provided with signal input part and earth terminal in the described sample circuit, it is characterized in that: the periphery of described induction coil is coated with a Copper Foil screen, the output of induction coil is connected with the multiple twin shielding conductor, described Copper Foil screen is connected with the earth terminal of described sample circuit by a lead, holding wire in the described multiple twin shielding conductor is connected with the signal input part of sample circuit, and the screen in the multiple twin shielding conductor is connected with the earth terminal of sample circuit.
2. a kind of hollow mutual inductor that is used for high-voltage switch gear as claimed in claim 1 is characterized in that: the line of described induction coil directly is 0.14mm, and the number of turn is 2700 circles.
3. a kind of hollow mutual inductor that is used for high-voltage switch gear as claimed in claim 1, it is characterized in that: described induction coil is an air core solenoid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810201500A CN101728075A (en) | 2008-10-21 | 2008-10-21 | Hollow mutual inductor for high-voltage switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810201500A CN101728075A (en) | 2008-10-21 | 2008-10-21 | Hollow mutual inductor for high-voltage switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101728075A true CN101728075A (en) | 2010-06-09 |
Family
ID=42448793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810201500A Pending CN101728075A (en) | 2008-10-21 | 2008-10-21 | Hollow mutual inductor for high-voltage switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101728075A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102148096A (en) * | 2011-01-25 | 2011-08-10 | 中国西电电气股份有限公司 | Implementation method for rapid saturation of electronic type current transformer with super lager diameter |
| CN106574472A (en) * | 2014-09-04 | 2017-04-19 | 博格华纳公司 | Bus configured latching solenoid |
| CN115327218A (en) * | 2022-10-13 | 2022-11-11 | 北京京仪北方仪器仪表有限公司 | Non-invasive power factor measuring device and split type electric power measuring system |
-
2008
- 2008-10-21 CN CN200810201500A patent/CN101728075A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102148096A (en) * | 2011-01-25 | 2011-08-10 | 中国西电电气股份有限公司 | Implementation method for rapid saturation of electronic type current transformer with super lager diameter |
| CN102148096B (en) * | 2011-01-25 | 2013-07-24 | 中国西电电气股份有限公司 | Implementation method for rapid saturation of electronic type current transformer with super lager diameter |
| CN106574472A (en) * | 2014-09-04 | 2017-04-19 | 博格华纳公司 | Bus configured latching solenoid |
| CN115327218A (en) * | 2022-10-13 | 2022-11-11 | 北京京仪北方仪器仪表有限公司 | Non-invasive power factor measuring device and split type electric power measuring system |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100609 |