CN105719753A - Multi-terminal ground cable - Google Patents
Multi-terminal ground cable Download PDFInfo
- Publication number
- CN105719753A CN105719753A CN201610072089.1A CN201610072089A CN105719753A CN 105719753 A CN105719753 A CN 105719753A CN 201610072089 A CN201610072089 A CN 201610072089A CN 105719753 A CN105719753 A CN 105719753A
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- CN
- China
- Prior art keywords
- sheath
- screen layer
- ring
- stripping
- cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/22—Metal wires or tapes, e.g. made of steel
- H01B7/226—Helicoidally wound metal wires or tapes
Abstract
The invention discloses a multi-terminal ground cable, which sequentially comprises a cable sheath, an armor layer, a shielding layer, an insulating filler layer and a wire part from the outside to the inside, wherein the shielding layer is formed by winding a copper strip; the armor layer comprises at least one pair of adjacent spaced armor layer stripping rings; the adjacent spaced armor layer stripping rings are used for stripping the armor layer to expose the shielding layer; and the exposed shielding layer is grounded. According to the multi-terminal ground cable disclosed by the invention, multi-terminal grounding can be carried out on the secondary equipment cable by stripping the cable sheath and manually taking out the armor layer stripping rings and shielding layer stripping rings; the ground point can be flexibly adjusted according to the structure of a ground screen and the direction of an electromagnetic field, so that the ring formed by the ground cable and the ground screen is the smallest; a copper cable with a relatively large section can be paved at a position of an interference source; and the copper cable with a relatively small section is paved at the position far away from the interference source, so that the targets of minimized circulating current and the lowest cost are achieved.
Description
Technical field
The present invention relates to the electromagnetic shielding field of power system, be specifically related to a kind of multiterminal earth cable.
Background technology
In recent years, along with the fast development of power industry technology of transmission of electricity, particularly flexible AC technology at home prevailing, dynamic reactive compensation device SVC has become in power system comparatively important component part.It is relatively near that SVC reactor is liftoff, and electric current is relatively big, belongs to low-voltage, high-current equipment, and its electromagnetic interference is mainly manifested in magnetic field intensity much larger than electric field intensity.Linear quadratic control cable in its vicinity, according to the rules, it is necessary to by two-terminal-grounding so that it is screen layer forms a ring with earth mat.SVC plane graph is as shown in Figure 1a, owing to earth mat grid gap is bigger, reach about 10 meters, the ring that earth mat is formed with cable shield is bigger, specify according to existing industry, cable shield two-terminal-grounding, then the electric current flowing through cable shield is bigger, its measured value is close to 100A, and ground terminal can be burnt by so big electric current；It addition, after ground terminal burns, cause that cable is single-end earthed, now will producing high voltage at the cable other end, voltage magnitude, up to 10.47V, will affect the safe and stable operation of electrical secondary system.
Summary of the invention
Present invention aims to above-mentioned problems of the prior art, a kind of multiterminal earth cable is proposed, the electric current flowing through cable shield produced because of high-intensity magnetic field can being prevented excessive, thus preventing from burning ground terminal, and ensureing the safe and stable operation of electrical secondary system.
For reaching the purpose of foregoing invention, the present invention is achieved through the following technical solutions:
A kind of multiterminal earth cable, ecto-entad is followed successively by cable sheath, sheath, the screen layer of copper strips coiling, insulation fill stratum and wire portion, described sheath includes the sheath stripping ring of at least one pair of adjacent spaces, the sheath stripping ring of this adjacent spaces exposes screen layer in order to the sheath between divesting, the shielding layer grounding exposed.
Further, described sheath stripping ring includes sheath stripping ring ring body and is located at the sheath stripping ring stripping portion of sheath stripping ring ring body open side, and described sheath stripping ring ring body is strip with sheath with layer around on the shielding layer.
Further, screen layer corresponding between two sheath stripping rings of described adjacent spaces is additionally provided with a screen layer in order to screen layer to be divided into two joints and shells ring, the shielding layer grounding of screen layer stripping ring both sides.
Further, each sheathed one in order to the copper ring of ground connection on the screen layer of screen layer stripping ring both sides.
Further, described screen layer stripping ring includes screen layer stripping ring ring body and is located at the screen layer stripping ring stripping portion of screen layer stripping ring ring body open side, and described screen layer stripping ring ring body is that strip is wound on insulation fill stratum with layer with screen layer.
Further, described sheath stripping ring is all steel with sheath.
Further, described sheath stripping ring ring body is one-body molded in connection with sheath, and both junctions are peelable limit.
Further, described screen layer stripping ring is all copper material with screen layer.
Further, described screen layer stripping ring ring body is one-body molded in connection with screen layer, and both junctions are peelable limit.
Further, the sheath stripping ring correspondence cable sheath place of each pair of adjacent spaces of described sheath is provided with grounding tag.
A kind of multiterminal earth cable of the present invention, has the advantages that
1, propose the mode of cable multiterminal ground connection, reduce the circulation of cable shield.
2, by shirtsleeve operation, strip cable crust, manually take out sheath stripping ring and screen layer stripping ring, secondary device cable can be carried out multiterminal ground connection；
3, earth point can carry out flexible according to the direction of the structure of earth mat, electromagnetic field, make minimum with the ring that earth mat is formed, and can lay, at position of interference source, the copper cable that cross section is bigger, and the copper cable that cross section is less is laid in the position away from interference source, minimize thus reaching loop current, the purpose that cost is minimum
Accompanying drawing explanation
Fig. 1 a is existing arrangement and the mode of connection schematic diagram of linear quadratic control cable and earth mat.
Fig. 1 b is linear quadratic control cable, cable duct grounding copper bar, the existing arrangement of earth mat and mode of connection schematic diagram.
Fig. 1 c is the multistage earth cable of the embodiment of the present invention, cable duct grounding copper bar, the arrangement of earth mat and mode of connection schematic diagram.
Fig. 2 a is the successively anatomical structure schematic diagram of existing cable.
Fig. 2 b is the cross-sectional structure schematic diagram of existing cable.
Fig. 3 is the structural representation at the sheath stripping ring place of the multiterminal earth cable of the present invention.
Fig. 4 is the structural representation at the screen layer stripping ring place of the multiterminal earth cable of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.
Refer to Fig. 1 a, represent with grid of dashed lines for earth mat 2, cable shield 13 represents for the hollow broken line of A-F-E, and interference source 4 can be the interference sources such as large hollow reactor, spark gap, voltage transformer.If directly cable shield 13 being received on earth mat 2, the ring that then cable shield 13 and earth mat are formed is A-B-C-D-E-F ring, its enclosed area is bigger, and the resistance of earth mat 2 is bigger, bigger at the pressure reduction of two earth terminals A, E of cable shield 13, thus form bigger grounding circulation, its computing formula is as follows:
φ=BS；... ... ... ... (1)
Wherein φ is magnetic flux, and B is magnetic induction, and S is area, and ε is variation rate of magnetic flux, and I is faradic current, and R is resistance.Wherein resistance R includes: the resistance of earth mat 2, the resistance of cable shield 13, the resistance of earth lead, the contact resistance of earth lead and cable shield 13, and the contact resistance of earth lead and earth mat 2.Wherein the contact resistance of the contact resistance of earth lead and cable shield 13, earth lead and earth mat 2 accounts for bigger ratio.
Refer to Fig. 1 b, in order to reduce circulation, the copper cable 3 of 100 squares can be laid along cable duct and form secondary grounded screen, reduce the resistance of cable shield 13 two earth terminals A, E, reduce the pressure reduction at A, E two ends, reduce the area of the ring that cable shield 13 is formed with earth mat 2 (including secondary grounded screen), thus reducing the circulation of cable shield 13 simultaneously.But the area of its formation is still relatively big, the circulation of cable shield 13 is still relatively big, and 100 squares of copper cable costs that cable duct is laid are higher.
Refer to Fig. 1 c, the present invention passes through cable shield multiterminal ground connection, is connected to tn-Tn with t1-T1 ground connection gradually mutually with t2-T2 earthing mode, and wherein t1 to tn is the link on copper cable, and T1 to Tn is the link on the cable shield 13 of multiterminal earth cable.The ring that cable shield 13 and earth mat 2 are formed is divided into multiple little ring, reduce the area of the ring that cable shield 13 is formed with earth mat 2, reduce the circulation of cable shield 13 further, and can lay, in the place near interference source 4, the blister copper cable 31 that area of section is bigger, and lay the less thin copper cable 32 of area of section or galvanized steel plain sheet in the place away from interference source 4, thus reduce cost.
In conjunction with Fig. 2 a and Fig. 2 b, it is the successively sectional view of existing cable and cross-sectional structure figure respectively, existing cable, because being outdoor placement, in order to place pulling of external force, biting of animal, it is generally adopted armored cable, owing to the armour band of sheath is harder, linear quadratic control cable at two-terminal-grounding, never can only be taked in the measure controlling cable middle ground.In order to realize controlling the multiterminal ground connection of cable, a kind of multiterminal earth cable of the present invention, ecto-entad is followed successively by cable sheath 11, sheath 12, the screen layer 13 of copper strips coiling, insulation fill stratum 14 and wire portion 15, described sheath 12 forms for armour band coiling, referring to Fig. 3, it includes the sheath stripping ring 16 of at least one pair of adjacent spaces, the sheath stripping ring 16 of this adjacent spaces exposes screen layer 13 in order to the sheath between divesting, screen layer 13 ground connection exposed, for one section of cable, it is every a segment distance, the sheath stripping ring 16 of a pair adjacent spaces is set, thus realizing the effect of multiterminal ground connection.
In the present embodiment, for the sheath stripping ring 16 including two pairs of adjacent spaces, multipair sheath stripping ring 16 it is provided with in the middle part of cable, sheath stripping ring 16 is connected with cable sheath, described sheath stripping ring 16 includes sheath stripping ring ring body 162 and is located at the sheath stripping ring stripping portion 161 of sheath stripping ring ring body 162 open side, described sheath stripping ring ring body 162 is wound on screen layer 13 for strip and sheath 12 with layer, sheath 12 between two sheath stripping rings 16 can lay out by armour band forms, now just exposes screen layer 13 and treats ground connection position.
As another embodiment, after strip off sheath 12, as required cable shield 13 is arranged following structure, referring to Fig. 4, screen layer 13 corresponding between two sheath stripping rings 16 of described adjacent spaces is additionally provided with a screen layer in order to screen layer 13 to be divided into two joints and shells ring 17, after taking out described screen layer stripping ring 17, cable shield 13 can be divided into two sections of positions being not connected with, screen layer stripping ring 17 both sides are in order to ground connection, it is further used as another embodiment, on the screen layer 13 of screen layer stripping ring 17 both sides, each sheathed one in order to the copper ring 181 of ground connection, 182, after cable shield 13 herein disconnects, it is further added by two copper rings, add the thickness of screen layer 13 accordingly, thus the resistance of screen layer 13 will not be increased after peeling off screen layer stripping ring 17, because of without reducing shield effectiveness, and it is beneficial to site operation.
As an embodiment, described screen layer stripping ring 17 includes screen layer stripping ring ring body 172 and is located at the screen layer stripping ring stripping portion 171 of screen layer stripping ring ring body 172 open side, described screen layer stripping ring ring body 172 is wound on insulation fill stratum 14 for strip and screen layer 13 with layer, and screen layer stripping ring stripping portion 171 is divested screen layer stripping ring ring body 172 as force position by simple tool.
As an embodiment, described sheath stripping ring 16 is all steel with sheath 12,.
As an embodiment, described sheath stripping ring ring body 162 is one-body molded in connection with sheath 12, and both junctions are peelable limit, as another embodiment, has gap between sheath stripping ring ring body 162 and sheath 12.
As an embodiment, described screen layer stripping ring 17 is all copper material with screen layer 13.
As an embodiment, described screen layer stripping ring ring body 172 is one-body molded in connection with screen layer 13, and both junctions are peelable limit, as another embodiment, has gap between screen layer stripping ring ring body 172 and screen layer 13.
Corresponding cable sheath 11 place of sheath stripping ring 16 of described 12 each pairs of adjacent spaces of sheath is provided with grounding tag, it is simple to engineering staff's Rational choice cable grounding position.
Above-described embodiment is only in order to illustrate the present invention and and unrestricted technical scheme described in the invention；Therefore, although this specification with reference to each above-mentioned embodiment to present invention has been detailed description, but, it will be understood by those within the art that, still the present invention can be modified or equivalent replace；And all are without departing from the technical scheme of the spirit and scope of the present invention and improvement thereof, it all should be encompassed in the middle of scope of the presently claimed invention.
Claims (10)
1. a multiterminal earth cable, ecto-entad is followed successively by cable sheath (11), sheath (12), the screen layer (13) of copper strips coiling, insulation fill stratum (14) and wire portion (15), it is characterized in that, described sheath (12) includes sheath stripping ring (16) of at least one pair of adjacent spaces, sheath stripping ring (16) of this adjacent spaces exposes screen layer (13) in order to the sheath between divesting, screen layer (13) ground connection exposed.
2. multiterminal earth cable according to claim 1, it is characterized in that, described sheath stripping ring (16) includes sheath stripping ring ring body (162) and is located at sheath stripping ring stripping portion (161) of sheath stripping ring ring body (162) open side, and described sheath stripping ring ring body (162) is wound on screen layer (13) with layer for strip and sheath (12).
3. multiterminal earth cable according to claim 1 and 2, it is characterized in that, screen layer (13) corresponding between two sheath stripping ring (16) of described adjacent spaces is additionally provided with a screen layer in order to screen layer (13) to be divided into two joints and shells ring (17), screen layer (13) ground connection of screen layer stripping ring (17) both sides.
4. multiterminal earth cable according to claim 3, it is characterised in that the screen layer (13) upper each sheathed of described screen layer stripping ring (17) both sides is in order to the copper ring (181,182) of ground connection.
5. multiterminal earth cable according to claim 4, it is characterized in that, described screen layer stripping ring (17) includes screen layer stripping ring ring body (172) and is located at screen layer stripping ring stripping portion (171) of screen layer stripping ring ring body (172) open side, and described screen layer stripping ring ring body (172) is wound on insulation fill stratum (14) with layer for strip and screen layer (13).
6. multiterminal earth cable according to claim 1 and 2, it is characterised in that described sheath stripping ring (16) and sheath (12) are all steel.
7. multiterminal earth cable according to claim 1 and 2, it is characterised in that described sheath stripping ring ring body (162) is one-body molded in connection with sheath (12), and both junctions are peelable limit.
8. multiterminal earth cable according to claim 4, it is characterised in that described screen layer stripping ring (17) and screen layer (13) are all copper material.
9. multiterminal earth cable according to claim 7, it is characterised in that described screen layer stripping ring ring body (172) is one-body molded in connection with screen layer (13), and both junctions are peelable limit.
10. multiterminal earth cable according to claim 8, it is characterised in that corresponding cable sheath (11) place of sheath stripping ring (16) of described sheath (12) each pair of adjacent spaces is provided with grounding tag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610072089.1A CN105719753A (en) | 2016-02-02 | 2016-02-02 | Multi-terminal ground cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610072089.1A CN105719753A (en) | 2016-02-02 | 2016-02-02 | Multi-terminal ground cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105719753A true CN105719753A (en) | 2016-06-29 |
Family
ID=56155484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610072089.1A Pending CN105719753A (en) | 2016-02-02 | 2016-02-02 | Multi-terminal ground cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105719753A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106297977A (en) * | 2016-10-12 | 2017-01-04 | 江苏亨通电子线缆科技有限公司 | A kind of shielding line of multiway ground connection |
| CN109346231A (en) * | 2018-10-08 | 2019-02-15 | 郑州云海信息技术有限公司 | A kind of cable for eliminating electromagnetic interference |
| CN110491583A (en) * | 2019-09-10 | 2019-11-22 | 武汉新天地电工科技有限公司 | Minerals halide-free low-smoke fireproof cable |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004207085A (en) * | 2002-12-26 | 2004-07-22 | Yazaki Corp | Electromagnetic shield cable and electromagnetic shield type single core twisted cable |
| CN202034091U (en) * | 2011-03-28 | 2011-11-09 | 安徽省繁昌县裕鑫线缆有限公司 | Special cable |
| CN105047274A (en) * | 2015-06-28 | 2015-11-11 | 中航光电科技股份有限公司 | Prefabricated cable and cable assembly using prefabricated cable |
| CN105185433A (en) * | 2015-06-28 | 2015-12-23 | 中航光电科技股份有限公司 | Armored cable and cable assembly using same |
| CN205621478U (en) * | 2016-02-02 | 2016-10-05 | 中国南方电网有限责任公司超高压输电公司梧州局 | Multiple ends earthing cable |
-
2016
- 2016-02-02 CN CN201610072089.1A patent/CN105719753A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004207085A (en) * | 2002-12-26 | 2004-07-22 | Yazaki Corp | Electromagnetic shield cable and electromagnetic shield type single core twisted cable |
| CN202034091U (en) * | 2011-03-28 | 2011-11-09 | 安徽省繁昌县裕鑫线缆有限公司 | Special cable |
| CN105047274A (en) * | 2015-06-28 | 2015-11-11 | 中航光电科技股份有限公司 | Prefabricated cable and cable assembly using prefabricated cable |
| CN105185433A (en) * | 2015-06-28 | 2015-12-23 | 中航光电科技股份有限公司 | Armored cable and cable assembly using same |
| CN205621478U (en) * | 2016-02-02 | 2016-10-05 | 中国南方电网有限责任公司超高压输电公司梧州局 | Multiple ends earthing cable |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106297977A (en) * | 2016-10-12 | 2017-01-04 | 江苏亨通电子线缆科技有限公司 | A kind of shielding line of multiway ground connection |
| CN109346231A (en) * | 2018-10-08 | 2019-02-15 | 郑州云海信息技术有限公司 | A kind of cable for eliminating electromagnetic interference |
| CN110491583A (en) * | 2019-09-10 | 2019-11-22 | 武汉新天地电工科技有限公司 | Minerals halide-free low-smoke fireproof cable |
| CN110491583B (en) * | 2019-09-10 | 2021-02-09 | 武汉新天地电工科技有限公司 | Mineral halogen-free low-smoke flame-retardant cable |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160629 |