CN103050957B - Multifunction combined secondary cable lightning protection and equipotential guard method and device - Google Patents
Multifunction combined secondary cable lightning protection and equipotential guard method and device Download PDFInfo
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- CN103050957B CN103050957B CN201210577268.2A CN201210577268A CN103050957B CN 103050957 B CN103050957 B CN 103050957B CN 201210577268 A CN201210577268 A CN 201210577268A CN 103050957 B CN103050957 B CN 103050957B
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- cable
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- lightning
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- secondary cable
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- 239000002184 metal Substances 0.000 claims abstract description 9
- 241000283984 Rodentia Species 0.000 claims abstract description 8
- 230000002265 prevention Effects 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 4
- 230000001681 protective Effects 0.000 claims description 21
- 230000000903 blocking Effects 0.000 claims description 2
- 238000004079 fireproofing Methods 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 201000006353 filariasis Diseases 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 230000001939 inductive effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000005684 electric field Effects 0.000 description 5
- 230000001808 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000002633 protecting Effects 0.000 description 2
- 206010069870 Device damage Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000004064 dysfunction Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Abstract
The invention discloses a kind of multifunction combined secondary cable lightning protection and equipotential guard method and device; the closed conduit that it is made up of upper and lower two parts metal shield materials, flange, left and right connecting bolt and nut, up and down connecting bolt and nut, equipotential link ground connection, protection against rodents fire prevention barrier layer are formed, and have thunder-lightning filariasis flower and pass through the functions such as secondary cable, anti-induction lightning overvoltage, protection against rodents fire prevention and equipotential link.This guard method and the upper and lower dismounting of device sectional, be convenient to enlarging and maintenance.The present invention has the advantage that lightning protection shielding sense is effective, structure is simple, applied widely, safe and reliable.
Description
Technical field
The present invention relates generally to secondary cable protection field, refers in particular to that a kind of sparkover that secondary cable can be protected to cause from thunder and lightning is passed through, induction overvoltage, equipotential link and protection against rodents flameproof protection method and device.
Background technology
When lightning current enters ground through the down conductor of the lightening protection apparatus such as lightning rod, lightning conducter or lightning arrester, spark-over can be produced entering place, if near when having secondary cables such as control, protection or communication; the sparkover produced when thunder and lightning flows into ground could pass through burn secondary cable, or causes thunder and lightning to disturb to secondary cable; When there being lightening activity above the secondary cables such as control, protection or communication, lightning induced voltage can be produced on secondary cable, the lightning induced voltage produced invades control, protection or communication unit along cable line, these system dysfunction or device damage can be caused, although the secondary cables such as control, protection or communication have a netted metal screen layer, but still there is leak in the shield effectiveness of this metal screen layer to thunder and lightning, still can produce induction overvoltage, particularly can not pass through cable to lightning current spark and carry out available protecting; In power plant, electric substation occurs ground network local potential can be caused to raise when power frequency short circuit current or thunder and lightning flow into ground, and earth mat potential difference can be coupled into secondary circuit by differential mode interference or common mode disturbances, formation earth potential interference.
Based on the weakness of secondary cable on lightning protection such as above-mentioned control, protection or communications, patent of the present invention is passed through from lightning current at protection cable, prevents that there is larger actual application value the aspect such as thunder and lightning induction voltage and equipotential link.Multifunction combined secondary cable lightning protection and the equipotential guard method of invention and the upper and lower dismounting of device sectional, be convenient to enlarging and overhaul.The present invention has the advantage that lightning protection shielding is effective, structure is simple, applied widely, safe and reliable.
Summary of the invention
The present invention is directed to when lightning current enters ground through the down conductor of the lightening protection apparatus such as lightning rod, lightning conducter or lightning arrester; to the electric spark burn that secondary cable may cause; on secondary cable, lightning induced voltage is produced, the multifunction combined secondary cable lightning protection of one that power plant, electric substation occur ground network local potential to be caused to raise when power frequency short circuit current or thunder and lightning flow into ground and form earth potential interference to secondary cable and invent and equipotential guard method and device when there being lightening activity above secondary cable.
Technical scheme of the present invention is: multifunction combined secondary cable lightning protection and equipotential guard method and device; the closed conduit that it is made up of upper and lower two parts metal material, flange, left and right connecting bolt and nut, up and down connecting bolt and nut, equipotential link, protection against rodents fire prevention barrier layer are formed, and have that thunder-lightning spark passes through, anti-induction lightning overvoltage, a function such as protection against rodents fire prevention and equipotential link.This guard method and the upper and lower dismounting of device sectional, be convenient to enlarging and maintenance.The present invention has the advantage that lightning protection shielding sense is effective, structure is simple, applied widely, safe and reliable.
(1) electric screen principle
Cable is put into described protective device, and the power line of the electric field produced to stop extraneous lightning current enters protective device inside, and protection cable machinery is not by the interference of external electrical field induction.(its schematic diagram as shown in Figure 13)
The capacitive coupling existed between field source and protected cable is disturbed (after see formula 1., as shown in Figure 14), applying shield, to disturb the capacitive coupling (see formula 2., as shown in Figure 15) existed between field source and protected cable when not adding shield
①
②
Through type (1), (2) can be found out
very little, so
also very little, and for closed conduit shield,
substantially be 0, so
also substantially equal 0, the effect that shields completely of electric field lines to external world can be played.
(2) magnetic screen principle
Two parts closed conduit shield made with metal material has low magnetoresistive.
The magnetic field intensity of lightning strike spot certain point outer:
③
In formula: I is amplitude of lightning current, R is the distance of magnetic field point to lightning strike spot.
Magnetic field shielding principle suppresses between lightning strike spot and cable machinery due to interference that magnetic Field Coupling produces, magnetic field shielding is that the magnetic line of force is enclosed in protective device, thus stop that internal magnetic field enters, for the magnetic field inside and outside shield provides the path of low magnetic resistance to shunt magnetic field to outdiffusion or external magnetic field interference; (as shown in Figure 16) when magnetic induction line enters shield from air, magnetic induction line is very large to departing from of normal, therefore convergence effect is consumingly had, in figure, A is the closed conduit shield made by metal material, because the magnetic permeability μ of described device is more much bigger than air magnetic permeability mu, so most magnetic field line passes through in the wall of shield, and in cavity in shield, magnetic induction line is little, and this just reaches the object of magnetic screen.
Screening effectiveness:
dB④
In formula: E
0unshielded is the electric field strength of space point
H
0unshielded is the magnetic field intensity of space point
E
1shielding is had to be the electric field strength of space point
H
1shielding is had to be the magnetic field intensity of space point
Tool of the present invention has the following advantages:
1) equipotential link
Ground network local potential can be caused to raise when power frequency short circuit current or thunder and lightning flow into ground, and be coupled into secondary circuit by differential mode interference or common mode disturbances, form earth potential interference.In order to prevent earth potential interference, the combined metal pipeline taked has lower resistance, and compartment distance is connected with earth mat, has forced earth mat at the potential balance of cable passage each point.
2) lightning protection electric current passes through secondary cable
When lightning current enters ground by thunder resisting equipment down conductors such as lightning rod, lightning conducter or lightning arresters, lightning current is entering place formation spark-over.Described protective device is all-metal obturator, can protect lightning current, and protection secondary cable passes through from lightning current and disturbs.
3) prevent from secondary cable produces induction overvoltage
When there being lightening activity above secondary cable, can produce lightning induced voltage on secondary cable, then invade from cable and measure and control appliance, the lighter causes computer system functions disorderly, and severe one can cause control or communication apparatus to damage.This method and device have carried out fully closed shielding protection to secondary cable, the lightning induced voltage produced when effectively prevent lightening activity.
4) protection against rodents fire-proof function
Arrange blocking section in described device inside, fill sand fire proofing, prevent the toys such as mouse from described device, entering master-control room, cause short trouble, the normal operation of harm converting equipment, substantially increases the fail safe that equipment runs.
Accompanying drawing explanation
Fig. 1 cable equipotential protective device three dimensional designs figure
Fig. 2 cable equipotential protective device structure chart (vertical view)
Fig. 3 cable equipotential protective device structure chart (left view)
Fig. 4 cable equipotential protective device cutaway view (A-A cuts open)
Fig. 5 cable corner connection equipotential protective device three dimensional designs figure
Fig. 6 cable corner connection equipotential protective device structure chart (vertical view)
Fig. 7 cable corner connection equipotential protective device structure chart (left view)
Fig. 8 cable corner connection equipotential protective device cutaway view (B-B cuts open)
Fig. 9 cable interconnection place equipotential protective device three dimensional designs figure
Figure 10 cable interconnection place equipotential protective device structure chart (vertical view)
Figure 11 cable interconnection place equipotential protective device structure chart (front view)
Figure 12 cable interconnection place equipotential protective device cutaway view (C-C cuts open)
Figure 13 electric screen body principle schematic
Figure 14 disturbs capacitance coupling circuit schematic diagram between field source and protected cable
The metal shield circuit diagram of Figure 15 ground connection
Figure 16 magnetic screen schematic diagram.
Embodiment
A kind of multifunction combined secondary cable lightning protection and equipotential link guard method and device, the enclosed cable pipeline (4) that it be made up of upper and lower two parts metal shield materials, left and right adpting flange (3), left and right connecting bolt and nut (2), upper and lower connecting bolt and nut (1) formation; Protective device is combined by described upper and lower two parts cable duct (4), its device equivalent redius and length television cable actual conditions and determine, and arranges protection against rodents fire prevention barrier layer in enclosed cable pipeline (4) inside; Enclosed cable pipeline (4) two ends are left and right adpting flange (3), and flange (3) has upper and lower bolt and nut (1), are used for fastening upper and lower combined pipe; The circular hole that flange (3) has four angles to become 90 degree, carries out left and right incorporating aspects connection by left and right connecting bolt and nut (2), and as equipotential link; Upper and lower connecting bolt and nut (1) are drawn earth connection and are connected to earth mat (or other earth electrodes).
In order to be applicable to the various interfaces of cable, as a further improvement on the present invention:
At cable corner connection, adopt the combined enclosed cable pipe design of a kind of turning formula (three-dimensional effect diagram, vertical view, front view, cutaway view are shown in accompanying drawing 5,6,7,8 respectively).
In cable interconnection place, adopt a kind of special threeway, the combined enclosed cable pipe design of four flow-throughs (three-dimensional effect diagram, vertical view, front view, cutaway view are shown in accompanying drawing 9,10,11,12 respectively).
The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.Should be understood that; for those skilled in the art; some improvements and modifications without departing from the principles of the present invention; such as any tabular, box-like, the shield of tubular, column, the alteration of form of link or increase or reduce the quantity etc. of equipotential link pole, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. multifunction combined secondary cable lightning protection and an equipotential link protective device, the enclosed cable pipeline (4) that it is made up of upper and lower two parts metal shield materials, left and right adpting flange (3), left and right connecting bolt and nut (2), up and down connecting bolt and nut (1) are formed; Protective device is combined by described upper and lower two parts enclosed cable pipeline, its device equivalent redius and length television cable actual conditions and determine, and arranges protection against rodents fire prevention barrier layer in enclosed cable pipeline (4) inside; Enclosed cable pipeline (4) two ends are left and right adpting flange (3), and flange (3) has upper and lower bolt and nut (1), are used for fastening upper and lower enclosed cable pipeline; The circular hole that flange (3) has four angles to become 90 degree, carries out left and right incorporating aspects connection by left and right connecting bolt and nut (2), and as equipotential link; Upper and lower connecting bolt and nut (1) are drawn earth connection and are connected to earth mat or other earth electrodes, it is characterized in that: the upper and lower dismounting of device sectional, are convenient to enlarging and maintenance.
2. the multifunction combined secondary cable lightning protection of one according to claim 1 and equipotential link protective device, is characterized in that: the enclosed cable pipeline that this device adopts upper and lower two parts metal shield materials to form interlocks and connects with bolt and nut and combines.
3. the multifunction combined secondary cable lightning protection of one according to claim 1 and equipotential link protective device, is characterized in that: this device inside arranges blocking section, fills sand fire proofing; In secondary cable corner, adopt the combined enclosed cable pipeline of a kind of turning formula; A kind of threeway, the combined enclosed cable pipeline of four-way is adopted in cable interconnection place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210577268.2A CN103050957B (en) | 2012-12-27 | 2012-12-27 | Multifunction combined secondary cable lightning protection and equipotential guard method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210577268.2A CN103050957B (en) | 2012-12-27 | 2012-12-27 | Multifunction combined secondary cable lightning protection and equipotential guard method and device |
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| Publication Number | Publication Date |
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| CN103050957A CN103050957A (en) | 2013-04-17 |
| CN103050957B true CN103050957B (en) | 2015-11-11 |
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| CN201210577268.2A Active CN103050957B (en) | 2012-12-27 | 2012-12-27 | Multifunction combined secondary cable lightning protection and equipotential guard method and device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107086378A (en) * | 2017-06-12 | 2017-08-22 | 国电联合动力技术有限公司 | A kind of cable clamping apparatus and the Wind turbines including the device |
| CN109802345B (en) * | 2019-03-11 | 2020-12-15 | 江南造船(集团)有限责任公司 | Detachable pipe structure, cable pipe and air tightness detection method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003021294A (en) * | 2001-07-06 | 2003-01-24 | Takada Seisakusho:Kk | Built-up pipe |
| CN1853326A (en) * | 2003-09-16 | 2006-10-25 | 泰科电子雷伊化学有限公司 | Improvements in or relating to a protective casing component and an element for forming a protective casing component |
| CN201146328Y (en) * | 2007-11-30 | 2008-11-05 | 王如璋 | New type insulated bus connecting pipe |
| CN201656413U (en) * | 2010-01-19 | 2010-11-24 | 许伟 | Connecting device for middle heads of undersea power cable |
| CN102176549A (en) * | 2010-12-30 | 2011-09-07 | 蔡彭博 | Transparent security box of cable intermediate head |
-
2012
- 2012-12-27 CN CN201210577268.2A patent/CN103050957B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003021294A (en) * | 2001-07-06 | 2003-01-24 | Takada Seisakusho:Kk | Built-up pipe |
| CN1853326A (en) * | 2003-09-16 | 2006-10-25 | 泰科电子雷伊化学有限公司 | Improvements in or relating to a protective casing component and an element for forming a protective casing component |
| CN201146328Y (en) * | 2007-11-30 | 2008-11-05 | 王如璋 | New type insulated bus connecting pipe |
| CN201656413U (en) * | 2010-01-19 | 2010-11-24 | 许伟 | Connecting device for middle heads of undersea power cable |
| CN102176549A (en) * | 2010-12-30 | 2011-09-07 | 蔡彭博 | Transparent security box of cable intermediate head |
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| CN103050957A (en) | 2013-04-17 |
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