CN102646948A - Direct-current cable laying method capable of screening alternating-current electromagnetic interference - Google Patents
Direct-current cable laying method capable of screening alternating-current electromagnetic interference Download PDFInfo
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- CN102646948A CN102646948A CN2012101043611A CN201210104361A CN102646948A CN 102646948 A CN102646948 A CN 102646948A CN 2012101043611 A CN2012101043611 A CN 2012101043611A CN 201210104361 A CN201210104361 A CN 201210104361A CN 102646948 A CN102646948 A CN 102646948A
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Abstract
The invention relates to a direct-current cable laying method capable of screening alternating-current electromagnetic interference, which is characterized in that when bipolar direct-current cables are laid, transposition is conducted to the bipolar direct-current cables at certain distance, the times of transposition is enabled to be odd and the distance among transposition sections is required to be equal. By adopting the method provided by the invention, when the bipolar direct-current cables are laid, since the transposition is conducted to the bipolar direct-current cables at certain distance, the electromotive force induced by an external alternating-current line is enabled to generate induced current with magnitude being equal and directions being opposite within two adjacent transposition sections, and the goal of screening the electromagnetic interference of the external alternating-current line is achieved. Proved by practice, if the transposition is reasonably conducted, the effect of screening the electromagnetic interference of the alternating-current line can reach more than 95 percent or even 99 percent.
Description
Technical field
The present invention relates to a kind of laying method of direct current cables, particularly a kind of direct current cables laying method that shields the alternating electromagnetic interference belongs to power cable laying method technical field.
Background technology
At present a lot of documents are all pointed out; During normal the operation; There is inductive coupled electromagnetic interference in the alternating current circuit to DC line; On DC line, produce induced potential, and then produce power current component and the converter valve through the circuit two ends and in the change of current becomes, produce DC component and make it bear D.C. magnetic biasing for a long time.Excessive magnetic bias make the change of current become unshakable in one's determination asymmetric saturated, increase that loss, heating, audible noise increase, performance reduces, the lost of life.This kind electromagnetic interference not only exists on the direct current overhead transmission line, also on the direct current cables circuit, exists.The method that suppresses this kind electromagnetic interference at present mainly is through making each the cross streams circuit and the distance of DC line equate as much as possible to realize.But feasible on this kind theoretical method, in fact be limited by the actual operating state that has the alternating current circuit, effect is unsatisfactory.
Summary of the invention
The objective of the invention is: under the prerequisite of the system of laying that does not change existing alternating current circuit,, reach the extraneous alternating current circuit of shielding produces electromagnetic interference to direct current cables purpose through improvement to bipolar DC cable laying method.
Technical scheme of the present invention is: a kind of direct current cables laying method that shields the alternating electromagnetic interference; It is characterized in that; When the bipolar DC cable laying; Whenever all the bipolar DC cable is carried out coordinated transposition at a distance from a segment distance, and to make the number of times of coordinated transposition be odd number, the distance of every section transposition should equate.
The direct current cables laying method that aforesaid shielding alternating electromagnetic disturbs is characterized in that, and is preferred, when the distance of direct current cables is 1km when following, every at a distance from the 50m transposition once.
The direct current cables laying method that aforesaid shielding alternating electromagnetic disturbs is characterized in that, and is preferred, when the distance of direct current cables is 1km during to 10km, every at a distance from the 100m transposition once.
The direct current cables laying method that aforesaid shielding alternating electromagnetic disturbs is characterized in that, and is preferred, when the distance of direct current cables during greater than 10km, every at a distance from the 200m transposition once.
The direct current cables laying method that aforesaid shielding alternating electromagnetic disturbs is characterized in that, the bipolar DC cable is taked the directly grounded earthing mode in interconnected back, two ends.
The invention has the beneficial effects as follows: when adopting method of the present invention the bipolar DC cable laying; Because whenever all the bipolar DC cable being carried out coordinated transposition at a distance from a segment distance lays; Make the electromotive force of extraneous alternating current circuit induction in two adjacent coordinated transposition sections, produce the induced current of opposite sign but equal magnitude, thereby reach the purpose of the extraneous alternating current circuit of shielding electromagnetic interference.
Adopt method of the present invention, can effectively shield the electromagnetic interference of extraneous alternating current circuit, facts have proved, if coordinated transposition is laid rationally, its shield effectiveness to the alternating current circuit electromagnetic interference can reach more than 95%, even 99%.
Description of drawings
Fig. 1 is the schematic diagram of the direct current cables laying method of the embodiment of the invention.
Fig. 2 is the actual sketch map that lays of the direct current cables laying method of the embodiment of the invention.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to following embodiment.Those skilled in the art can do various changes or modification to the present invention, and these equivalent form of values are equally within the listed claims limited range of the application.
Principle of the present invention is: suppose sometime; The flow direction that passes each section coordinated transposition direct current cables is by interior outwards vertical; As shown in Figure 1 by the faradic direction of the right-hand rule, in the two neighboring sections coordinated transposition cable, induce equal and opposite in direction; Electric current in the opposite direction, then the induced current in the loop is 0 in theory.
The technical scheme that the embodiment of the invention provides is: avoid the electromagnetic interference of extraneous alternating current circuit to its generation when making the bipolar DC cable laying; We take following scheme: whenever all the bipolar DC cable is carried out coordinated transposition at a distance from a segment distance during bipolar DC cable laying; And the number of times that makes coordinated transposition is an odd number; The distance of every section transposition should equate that the bipolar DC cable is taked the directly grounded earthing mode in interconnected back, two ends.
The distance of transposition is recommended as follows:
When the distance of direct current cables is 1km when following, recommend every at a distance from the 50m transposition once.
When the distance of direct current cables is 1km during to 10km, recommend every at a distance from the 100m transposition once.
When the distance of direct current cables during greater than 10km, recommend every at a distance from the 200m transposition once.
The content of not doing in this specification to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (5)
1. one kind shields the direct current cables laying method that alternating electromagnetic disturbs; It is characterized in that, when the bipolar DC cable laying, whenever all the bipolar DC cable is carried out coordinated transposition at a distance from a segment distance; And the number of times that makes coordinated transposition is odd number time, and the distance of every section transposition should equate.
2. the direct current cables laying method that shielding alternating electromagnetic according to claim 1 disturbs is characterized in that, and is preferred, when the distance of direct current cables is 1km when following, every at a distance from the 50m transposition once.
3. the direct current cables laying method that shielding alternating electromagnetic according to claim 1 disturbs is characterized in that, and is preferred, when the distance of direct current cables is 1km during to 10km, every at a distance from the 100m transposition once.
4. the direct current cables laying method that shielding alternating electromagnetic according to claim 1 disturbs is characterized in that, and is preferred, when the distance of direct current cables during greater than 10km, every at a distance from the 200m transposition once.
5. the direct current cables laying method that shielding alternating electromagnetic according to claim 1 disturbs is characterized in that, the bipolar DC cable is taked the directly grounded earthing mode in interconnected back, two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101043611A CN102646948A (en) | 2012-04-11 | 2012-04-11 | Direct-current cable laying method capable of screening alternating-current electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101043611A CN102646948A (en) | 2012-04-11 | 2012-04-11 | Direct-current cable laying method capable of screening alternating-current electromagnetic interference |
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| CN102646948A true CN102646948A (en) | 2012-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012101043611A Pending CN102646948A (en) | 2012-04-11 | 2012-04-11 | Direct-current cable laying method capable of screening alternating-current electromagnetic interference |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711786A (en) * | 2018-05-29 | 2018-10-26 | 国家电网公司 | A kind of laying method convenient for electric compartment inner cable circuit reversing of position |
| CN109659865A (en) * | 2019-01-04 | 2019-04-19 | 中国电力科学研究院有限公司 | A kind of method and system for laying bipolar DC cable |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907651A (en) * | 2010-06-25 | 2010-12-08 | 中国电力科学研究院 | Main circuit current measuring device for high-voltage DC transmission converter valve |
-
2012
- 2012-04-11 CN CN2012101043611A patent/CN102646948A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907651A (en) * | 2010-06-25 | 2010-12-08 | 中国电力科学研究院 | Main circuit current measuring device for high-voltage DC transmission converter valve |
Non-Patent Citations (3)
| Title |
|---|
| 丁辉: "《华北电力大学博士学位论文》", 1 June 2010 * |
| 李新年等: "交流线路对平行架设特高压直流线路的影响及限制措施", 《电网技术》 * |
| 邵方殷: "交流线路对平行接近的直流线路的工频电磁感应", 《电网技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711786A (en) * | 2018-05-29 | 2018-10-26 | 国家电网公司 | A kind of laying method convenient for electric compartment inner cable circuit reversing of position |
| CN109659865A (en) * | 2019-01-04 | 2019-04-19 | 中国电力科学研究院有限公司 | A kind of method and system for laying bipolar DC cable |
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Application publication date: 20120822 |