CN103050957A - Multifunctional combined secondary cable lightening protection and equipotential protection method and device - Google Patents
Multifunctional combined secondary cable lightening protection and equipotential protection method and device Download PDFInfo
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- CN103050957A CN103050957A CN2012105772682A CN201210577268A CN103050957A CN 103050957 A CN103050957 A CN 103050957A CN 2012105772682 A CN2012105772682 A CN 2012105772682A CN 201210577268 A CN201210577268 A CN 201210577268A CN 103050957 A CN103050957 A CN 103050957A
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Abstract
The invention discloses a multifunctional combined secondary cable lightening protection and equipotential protection method and a multifunctional combined secondary cable lightening protection and equipotential protection device. The device consists of an enclosed pipeline consisting of an upper metal shielding material and a lower metal shielding material, flanges, horizontal connecting bolts and nuts, vertical connecting bolts and nuts, equipotential connection grounding and a ratproof fireproof blocking layer, and has functions of preventing lightning current spark from passing through a secondary cable, preventing inductive thunder overvoltage, preventing rats and fire, equipotential connection and the like. The protection device can be vertically disassembled in sections, and is convenient to expand and maintain. The invention has the advantages of good lightening shielding effect, simple structure, wide application range, safety and reliability.
Description
Technical field
The present invention relates generally to secondary cable protection field, refers in particular to and a kind ofly can protect that secondary cable avoids that the sparkover that thunder and lightning causes is passed through, induction overvoltage, equipotential connect and protection against rodents flameproof protection method and device.
Background technology
When lightning current when the down conductor of the lightning protection equipment such as lightning rod, lightning conducter or lightning arrester enters ground, place generation spark-over can entered, if near the sparkover meeting that then produces during the thunder and lightning inflow place when secondary cable such as control, protection or communication is arranged pass through the burn secondary cable, or cause thunder and lightning to disturb to secondary cable; When there is lightening activity the secondary cables such as control, protection or communication top, can produce lightning induced voltage at secondary cable, the lightning induced voltage that produces is invaded control, protection or communication unit along cable line, can cause these systemic-function disorder or device damage, although the secondary cables such as control, protection or communication have a netted metal screen layer, but still there is leak in this metal screen layer to the shield effectiveness of thunder and lightning, still can produce induction overvoltage, particularly can not pass through cable to the lightning current spark and effectively protect; In the power plant, electric substation can cause the ground network local potential to raise when power frequency short circuit current or thunder and lightning inflow place occur, the earth mat potential difference can be coupled into secondary circuit by differential mode interference or common mode disturbances, forms 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 avoided lightning current and is passed through at the protection cable, prevents that connection is connected the aspect that larger actual application value is arranged to thunder and lightning induction voltage with equipotential.Enlarging and maintenance are convenient in the multifunction combined secondary cable lightning protection of invention and equipotential guard method and the upper and lower dismounting of device sectional.The present invention has effective, simple in structure, applied widely, the safe and reliable advantage of lightning protection shielding.
Summary of the invention
The present invention is directed to when lightning current when the down conductor of the lightning protection equipment such as lightning rod, lightning conducter or lightning arrester enters ground; the electric spark that secondary cable may cause is burnt; when having lightening activity, the secondary cable top produces lightning induced voltage at secondary cable, power plant, electric substation can cause the ground network local potential to raise secondary cable formation earth potential interference is invented when power frequency short circuit current or thunder and lightning inflow place occur a kind of multifunction combined secondary cable lightning protection and equipotential guard method and device.
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 comprised of upper and lower two parts metal material, flange, left and right sides connecting bolt and nut, connecting bolt and nut, equipotential connect up and down, protection against rodents fire prevention barrier layer consists of, and have that the thunder-lightning spark passes through, functions such as anti-induction lightning overvoltage, protection against rodents fire prevention and equipotential connection.Enlarging and maintenance are convenient in this guard method and the upper and lower dismounting of device sectional.The present invention has effective, simple in structure, applied widely, the safe and reliable advantage of lightning protection shielding sense.
(1) electric screen principle
Cable is put into described protective device, enter protective device inside with the power line that stops the electric field that extraneous lightning current produces, the protection cable machinery is not subjected to the interference of external electrical field induction.(its schematic diagram as shown in Figure 13)
Disturb the capacitive coupling that exists between field source and the protected cable (to see formula 1., as shown in Figure 14), apply the capacitive coupling that exists between the interference field source and protected cable behind the shield and (see formula 2., as shown in Figure 15) when not adding shield
①
Through type (1), (2) can be found out
Very little, so
Also very little, and for the closed conduit shield,
Substantially be 0, so
Also substantially equal 0, can play the to external world effect that shields fully of electric field lines.
(2) magnetic screen principle
Two parts closed conduit shield made from metal material has low magnetoresistive.
The magnetic field intensity of outer certain point of lightning strike spot:
In the formula: I is amplitude of lightning current, and R is that magnetic field point is to the distance of lightning strike spot.
The magnetic field shielding principle is to suppress between lightning strike spot and the cable machinery because the interference that magnetic Field Coupling produces, magnetic field shielding is that the magnetic line of force is enclosed in the protective device, thereby stop that internal magnetic field enters to outdiffusion or external magnetic field interference, shunts magnetic field for the magnetic field inside and outside the shield provides the path of low magnetic resistance; (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 the effect of converging is consumingly arranged, the closed conduit shield of A for being made by metal material among the figure, because the magnetic permeability μ of described device is more much bigger than air magnetic permeability mu, thus most magnetic field line in the wall of shield, pass through, and in the cavity in the shield, magnetic induction line is seldom, and this has just reached the purpose of magnetic screen.
Screening effectiveness:
In the formula: E
0Unshielded is the electric field strength of space point
H
0Unshielded is the magnetic field intensity of space point
E
1It is the electric field strength of space point that shielding is arranged
H
1It is the magnetic field intensity of space point that shielding is arranged
The present invention has following advantage:
1) equipotential connects
When power frequency short circuit current or thunder and lightning inflow place, can cause the ground network local potential to raise, 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 of taking has lower resistance, and compartment has been forced the potential balance of earth mat at the cable passage each point apart from linking to each other with earth mat.
2) the lightning protection electric current passes through secondary cable
When lightning current entered ground by thunder resisting equipment down conductors such as lightning rod, lightning conducter or lightning arresters, lightning current was entering place formation spark-over.Described protective device is the all-metal obturator, can protect lightning current, and the protection secondary cable is avoided lightning current and passed through and disturb.
3) prevent from producing on the secondary cable induction overvoltage
When there is lightening activity the secondary cable top, can produce lightning induced voltage at secondary cable, then from cable, invade 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 that has produced when effectively having prevented lightening activity.
4) protection against rodents fire-proof function
In described device inside blocking section is set, fills the sand fire proofing, prevent that the toy such as mouse from entering master-control room in described device, cause short trouble, the normal operation of harm converting equipment has improved the equipment Operation safety greatly.
Description of drawings
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)
Junction, Fig. 5 cable turning equipotential protective device three dimensional designs figure
Junction, Fig. 6 cable turning equipotential protective device structure chart (vertical view)
Junction, Fig. 7 cable turning equipotential protective device structure chart (left view)
Junction, Fig. 8 cable turning 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 the protected cable
The metallic shield body circuit diagram of Figure 15 ground connection
Figure 16 magnetic screen schematic diagram.
Embodiment
A kind of multifunction combined secondary cable lightning protection is connected guard method and device with equipotential, the enclosed cable pipeline (4) that it is comprised of upper and lower two parts metal shield materials, left and right sides adpting flange (3), left and right sides connecting bolt and nut (2), connecting bolt and nut (1) consist of up and down; Protective device is combined by described upper and lower two parts cable duct (4), and its device equivalent redius and length television cable actual conditions and decide arrange the protection against rodents barrier layer of preventing fires in enclosed cable pipeline (4) inside; Enclosed cable pipeline (4) two ends are left and right sides adpting flange (3), and flange (3) has upper and lower bolt and nut (1), are used for fastening upper and lower combined pipe; There are four angles to become the circular hole of 90 degree on the flange (3), carry out left and right part by left and right sides connecting bolt and nut (2) and be connected, and connect as equipotential; Connecting bolt and nut (1) are drawn earth connection and are connected to earth mat (or other earth electrodes) up and down.
In order to be applicable to the various interface of cable, as a further improvement on the present invention:
In junction, cable turning, adopt the combined enclosed cable pipe design of a kind of turning formula (three-dimensional effect diagram, vertical view, front view, cutaway view are seen respectively accompanying drawing 5,6,7,8).
In cable interconnection place, adopt a kind of special threeway, the combined enclosed cable pipe design of four-way type (three-dimensional effect diagram, vertical view, front view, cutaway view are seen respectively accompanying drawing 9,10,11,12).
The above only is preferred implementation of the present invention, and protection scope of the present invention also not only is confined to above-described embodiment, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be understood that; for those skilled in the art; in the some improvements and modifications that do not break away under the principle of the invention prerequisite; such as alteration of form or the increase of the shield of any tabular, box-like, tubular, column, link or reduce the quantity etc. that equipotential connects the utmost point, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a multifunction combined secondary cable lightning protection is connected guard method and device with equipotential, and the enclosed cable pipeline (4) that it is comprised of upper and lower two parts metal shield materials, left and right sides adpting flange (3), left and right sides connecting bolt and nut (2), connecting bolt and nut (1) consist of up and down; Protective device is combined by described upper and lower two parts cable duct (4), and its device equivalent redius and length television cable actual conditions and decide arrange the protection against rodents barrier layer of preventing fires in enclosed cable pipeline (4) inside; Enclosed cable pipeline (4) two ends are left and right sides adpting flange (3), and flange (3) has upper and lower bolt and nut (1), are used for fastening upper and lower combined pipe; There are four angles to become the circular hole of 90 degree on the flange (3), carry out left and right part by left and right sides connecting bolt and nut (2) and be connected, and connect as equipotential; Connecting bolt and nut (1) are drawn earth connection and are connected to earth mat (or other earth electrodes) up and down.
2. multifunction combined secondary cable lightning protection according to claim 1 is connected guard method and device with equipotential, it is characterized in that: the enclosed cable pipeline that this device adopts upper and lower two parts metal shield materials to form interlocks and combines with bolt and nut connection.
3. multifunction combined secondary cable lightning protection according to claim 1 is connected guard method and device with equipotential, and it is characterized in that: this device inside arranges blocking section, fills the sand fire proofing.
4. multifunction combined secondary cable lightning protection according to claim 2 is connected guard method and device with equipotential, it is characterized in that: in secondary cable corner, adopt the combined enclosed cable pipeline of a kind of turning formula.
5. multifunction combined secondary cable lightning protection according to claim 2 is connected guard method and device with equipotential, it is characterized in that: adopt a kind of threeway, the combined enclosed cable pipeline of four-way 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 true CN103050957A (en) | 2013-04-17 |
| CN103050957B CN103050957B (en) | 2015-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109802345A (en) * | 2019-03-11 | 2019-05-24 | 江南造船(集团)有限责任公司 | Detachable pipe structure, cable tube 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109802345A (en) * | 2019-03-11 | 2019-05-24 | 江南造船(集团)有限责任公司 | Detachable pipe structure, cable tube and air-tightness detection method |
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| Publication number | Publication date |
|---|---|
| CN103050957B (en) | 2015-11-11 |
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