CN105655042A - High-voltage transmission power cable - Google Patents
High-voltage transmission power cable Download PDFInfo
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- CN105655042A CN105655042A CN201610152697.3A CN201610152697A CN105655042A CN 105655042 A CN105655042 A CN 105655042A CN 201610152697 A CN201610152697 A CN 201610152697A CN 105655042 A CN105655042 A CN 105655042A
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- resistance
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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
- H01B9/00—Power cables
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
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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
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
Abstract
The invention discloses a high-voltage transmission power cable which comprises a cable core, an insulating layer, a shielding layer, a protection layer and a supporting frame; the insulating layer is arranged outside the cable core, the shielding layer is arranged outside the insulating layer, a cavity is formed between the insulating layer and the shielding layer, and the insulating layer and the shielding layer are fixed through the supporting frame; the protection layer is arranged outside the shielding layer; the outer surface of the insulating layer is provided with temperature sensors at equal intervals in the axial direction. The high-voltage transmission power cable further comprises a first wire, a second wire and a third wire; every two of the first wire, the second wire and the third wire are tangent to each other; the first wire, the second wire and the third wire are arranged in the protection layer; the first wire, the second wire and the third wire are parallel to the cable wire respectively; by means of the high-voltage transmission power cable, the theft place can be known immediately at the moment when a thief steals the protection layer of the power cable.
Description
The divisional application of patent application that the application is the applying date, and to be December in 2014 10 days, application number be 201410752611.1, denomination of invention is " high voltage power transmission power cable ".
Technical field
The present invention relates to a kind of high voltage power transmission power cable, belong to high voltage power transmission technical field.
Background technology
Along with the fast development of national economy, consumption and the scope of use as the aortal power cable of national economy are increasing. Power cable is the cable for transmitting and distribute electric energy. Be usually used in Urban Underground electrical network, the lead line of electric station, industrial and mining establishment in-line power and cross river, excessively sea submarine transmission line. In power circuit, the proportion shared by power cable is just gradually increased. Power cable is in order to transmit and to distribute the cable product of high-power power in the basic routing line of power system, including 1-500KV and any of the above electric pressure, the power cable of various insulation.
The basic structure of power cable is made up of core (conductor), insulating barrier, screen layer and protective layer four part. Core is the current-carrying part of power cable, is used for carrying electric energy, is the major part of power cable. Insulating barrier is will to be electrically isolated from each other between core and the earth and out of phase core, it is ensured that electric energy is carried, and is indispensable ingredient in power cable structure. Screen layer, because the electric current that electric power cable passes through is relatively larger, can produce magnetic field around electric current, in order to not affect other element, and can this electromagnetic-field-shielded in cable so adding screen layer. The effect of protective layer is the intrusion from introduced contaminants and moisture of the protection power cable, and prevents external force from directly damaging power cable.
Power cable can be divided into core and overcoat (overcoat refers to insulating barrier, screen layer and protective layer) two large divisions structure; it is positioned at the core of innermost layer for transmitting electric energy; the overcoat being rolled in outside core has multiple structure, realizes the functions such as shielding, insulation, anti-external force destruction respectively. At high pressure and above defeated, power distribution network; owing to voltage is higher, theft live electric cable often can cause thief's injures and deaths, therefore; it is not the copper material aiming at wire that present robber steals power circuit, occurs in that a lot of 10kV stolen event of power cable overcoat in this year. Owing to cable laying is hidden, and it is not provided with supervising anti-system, therefore cable shield is stolen does not cause power failure and being not easily found of short circuit accident, but leave very big potential safety hazard. After some cable shield are stolen, although temporarily not occurring to have a power failure or personnel casualty accidents, but cable insulation degree of protection declines to a great extent, switching overvoltage, lightning surge, harmonic wave overvoltage, personnel trample, damaged by rats, all will trigger short circuit, and a certain phase short circuit is exploded, often cause a plurality of feeder line short circuit simultaneously of laying in one ditch, cause large-area power-cuts, it can be seen that, robber has buried, to power system, the potential safety hazard that many places are serious. Due to a plurality of overcoat stolen after cable be imbedded in underground, power department does not have the security situation of special monitoring of equipment cable so far, cannot learn that the overcoat of power cable is destroyed, thus can not adopt remedial measures in time, the safety of power system and periphery personnel and environment is made to be subject to serious threat.
Pass through above description, it is possible to find that the place that just can find and navigate to theft for robber when theft power cable overcoat at once is the problem highly studied.
The power cable that existing supertension is such as 1000 kilovolts is very big due to the electric current of heart yearn, so the heat radiation of power cable is always up a problem, and EHV XLPE power cable easily breaks down.
Summary of the invention
The technical problem to be solved in the present invention is: first, robber is difficult to be found when stealing the overcoat of high voltage power transmission power cable, leave very big potential safety hazard to transmission line of electricity, just can't find theft place at present when robber steals high voltage power transmission power cable overcoat at once. Second, the power cable that existing supertension is such as 1000 kilovolts is very big due to the electric current of heart yearn, so the heat radiation of power cable is always up a problem, and EHV XLPE power cable easily breaks down.
In order to realize solving above technical problem, the technical solution adopted in the present invention is: high voltage power transmission power cable, it is characterised in that include core, insulating barrier, screen layer, protective layer, bracing frame; Insulating barrier is arranged on the outside of core, and screen layer is arranged on the outside of insulating barrier and forms cavity between insulating barrier and screen layer, and insulating barrier and screen layer are fixed by bracing frame; Protective layer is arranged on the outside of screen layer;
The axially spaced set temperature sensor of the outer surface of insulating barrier;
Also include the first wire, the second wire, privates; Described the first wire, the second wire, privates external diameter tangent between two; Described the first wire, the second wire, privates are arranged in protective layer; Described the first wire, the second wire, privates are parallel with core respectively;
Also include the first resistance, the second resistance, the 3rd resistance, an AD unit, the 2nd AD unit, the 3rd AD unit, controller, display unit, alarm unit, the first DC source, the second DC source;
The left end of the first described wire electrically connects one end of the first resistance, the other end of the first resistance electrically connects the positive terminals of the first DC source, the negative terminals of the first DC source electrically connect one end of the second resistance, and the other end of the second resistance electrically connects the left end of the second wire;
The negative terminals of the first DC source electrically connect the positive terminals of the second DC source simultaneously; One end of negative terminals electrical connection the 3rd resistance of the second DC source, the left end of the other end electrical connection privates of the 3rd resistance;
Described the first wire, the second wire, privates right-hand member do not contact each other, and be provided with insulation protective jacket;
Temperature sensor is electrically connected with the controller;
The voltage signal at the first resistance two ends is input to controller by the oneth AD unit;
The voltage signal at the second resistance two ends is input to controller by the 2nd AD unit;
The voltage signal at the 3rd resistance two ends is input to controller by the 3rd AD unit;
The input of display unit is connected with the display signal output port of controller;
The input of alarm unit is connected with the alarm signal output ends mouth of controller.
Further, the resistance of described the first resistance, the second resistance and the 3rd resistance is equal.
Further, the resistance of described the first resistance, the second resistance and the 3rd resistance is 1 ohm.
Further, the external diameter of described the first wire, the second wire and privates is equal, and thickness of insulating layer is respectively less than 3mm.
Further, the thickness of insulating layer of described the first wire, the second wire and privates is 1mm.
Further, the first described DC source and the voltage of the second DC source are equal, consequently facilitating analytical calculation theft point.
Further, described controller adopts AT89S52 chip microcontroller.
Further, described display unit adopts LCD1864 display screen, and the theft calculated by controller point shows.
Further, described alarm unit adopts buzzer warning. So can there is robber at theft power cable by sound prompting.
Further, a described AD unit, the 2nd AD unit, the 3rd AD unit all adopt ADC0809 chip.
Compared with prior art, it is an advantage of the current invention that: high voltage power transmission power cable provided by the invention, when robber steals the place that just can immediately know theft that time of power cable overcoat, be effectively protected the safety of transmission line of electricity; Meanwhile, because robber thinks the words of theft core, it is necessary to first destroy protective layer, so the power cable of the present invention also effectively prevent robber and steals power cable core, and do not consume electric energy when not yet forming closed-loop path. The power cable of the present invention is applicable to supertension such as 1000 kilovolts, dispels the heat very good, and easily finds trouble point. The temperature value utilizing core axial direction can search the short dot of circuit easily, and some place in circuit occurs the problems such as deformation, damage can also be passed through temperature value change and find out simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of high voltage power transmission power cable of the present invention.
Wherein, 1 is core; 2 is insulating barrier; 3 is screen layer; 4 is protective layer; 9 is bracing frame.
Fig. 2 is three tangent schematic diagrams of wire in protective layer.
Wherein, 5 is the first wire; 6 is the second wire; 7 is privates; 8 is protective layer.
Fig. 3 is the real-time observation circuit principle schematic of theft point that the present invention relates to.
Detailed description of the invention
Below in conjunction with accompanying drawing, invention is described in further detail.
With reference to Fig. 1,2,3, high voltage power transmission power cable, including core, insulating barrier, screen layer, protective layer, bracing frame; Insulating barrier is arranged on the outside of core, and screen layer is arranged on the outside of insulating barrier and forms cavity between insulating barrier and screen layer, and insulating barrier and screen layer are fixed by bracing frame; Protective layer is arranged on the outside of screen layer;
The axially spaced set temperature sensor of the outer surface of insulating barrier;
Also include the first wire, the second wire, privates; Described the first wire, the second wire, privates external diameter tangent between two; Described the first wire, the second wire, privates are arranged in protective layer; Described the first wire, the second wire, privates are parallel with core respectively;
Also include the first resistance, the second resistance, the 3rd resistance, an AD unit, the 2nd AD unit, the 3rd AD unit, controller, display unit, alarm unit, the first DC source, the second DC source;
The left end of the first described wire electrically connects one end of the first resistance, the other end of the first resistance electrically connects the positive terminals of the first DC source, the negative terminals of the first DC source electrically connect one end of the second resistance, and the other end of the second resistance electrically connects the left end of the second wire;
The negative terminals of the first DC source electrically connect the positive terminals of the second DC source simultaneously; One end of negative terminals electrical connection the 3rd resistance of the second DC source, the left end of the other end electrical connection privates of the 3rd resistance;
Described the first wire, the second wire, privates right-hand member do not contact each other, and be provided with insulation protective jacket; Temperature sensor is electrically connected with the controller; The voltage signal at the first resistance two ends is input to controller by the oneth AD unit;The voltage signal at the second resistance two ends is input to controller by the 2nd AD unit; The voltage signal at the 3rd resistance two ends is input to controller by the 3rd AD unit; The input of display unit is connected with the display signal output port of controller; The input of alarm unit is connected with the alarm signal output ends mouth of controller.
Wherein, described controller adopts AT89S52 chip microcontroller. Described display unit adopts LCD1864 display screen, and described alarm unit adopts buzzer warning, so can have robber at theft power cable by sound prompting, and be shown by LCD1864 display screen in the theft place calculated. A described AD unit, the 2nd AD unit, the 3rd AD unit all adopt ADC0809 chip.
Wherein, the external diameter of described the first wire, the second wire and privates is 3cm, and wherein the thickness of insulating layer of wire is 1mm.
In the present embodiment, the length of power cable is 2000 meters, then the first wire, the second wire, the length of privates also just respectively 2000 meters, the first wire, the second wire, the resistance of privates respectively 10 ohm, the voltage of the first DC source and the second DC source all selects 30V, the first resistance, second resistance, 3rd resistance is 1 ohm, ensures that the first resistance, the second resistance, the voltage at the 3rd resistance two ends is not over 5V, and such AD unit could normal operation.
The present invention is capable of the principle of theft point monitoring in real time: no matter robber steals the core of power cable, or (overcoat includes insulating barrier to the overcoat of theft power cable, screen layer and protective layer), so it is required for first destroying protective layer, owing to protective layer is durable, generally it is not easy to destroy, therefore robber must adopt metal shear to cut off protective layer, and inside protective layer, it is provided with the first wire, second wire, privates, due to the first wire, second wire, tangent between two and wire the insulating barrier of the external diameter of privates is all very thin, in time adopting shears to cut off protective layer, it is bound to the first wire, second wire, privates is also cut off, exactly at shears by the first wire, second wire, privates is cut off at that moment, first wire, second wire, conductor within privates is connected to one piece by metal shear, the conductor at least having two wires can be electrically connected by metal shear, the conductor being likely to three wires all can be electrically connected by metal shear.
At this time, the circuit in the present invention is the formation of closed-loop path, it may be possible to the first wire and the second wire form closed-loop path, it is also possible to be that the second wire forms closed-loop path with privates, it is also possible to concurrently form two closed-loop paths. Once controller detects the first resistance, there is voltage at the second resistance or the 3rd resistance two ends it may determine that there is robber stealing power cable.
If, simply the first wire and the second wire define closed-loop path;
First, by the voltage at the first resistance two ends resistance divided by the first resistance, the electric current of closed-loop path is obtained;
Secondly, the voltage of the first DC source, divided by the electric current of closed-loop path, has calculated the all-in resistance of closed-loop path, and all-in resistance deducts the first resistance and the resistance of the second resistance, namely obtains the first wire and the total resistance value of the second wire;
Finally, by formula R=�� L/S, thus calculating theft place.(�� and S is known parameters).
Claims (3)
1. high voltage power transmission power cable, it is characterised in that include core, insulating barrier, screen layer, protective layer, bracing frame; Insulating barrier is arranged on the outside of core, and screen layer is arranged on the outside of insulating barrier and forms cavity between insulating barrier and screen layer, and insulating barrier and screen layer are fixed by bracing frame; Protective layer is arranged on the outside of screen layer;
The axially spaced set temperature sensor of the outer surface of insulating barrier;
Also include the first wire, the second wire, privates; Described the first wire, the second wire, privates external diameter tangent between two; Described the first wire, the second wire, privates are arranged in protective layer; Described the first wire, the second wire, privates are parallel with core respectively;
Also include the first resistance, the second resistance, the 3rd resistance, an AD unit, the 2nd AD unit, the 3rd AD unit, controller, display unit, alarm unit, the first DC source, the second DC source;
The left end of the first described wire electrically connects one end of the first resistance, the other end of the first resistance electrically connects the positive terminals of the first DC source, the negative terminals of the first DC source electrically connect one end of the second resistance, and the other end of the second resistance electrically connects the left end of the second wire;
The negative terminals of the first DC source electrically connect the positive terminals of the second DC source simultaneously; One end of negative terminals electrical connection the 3rd resistance of the second DC source, the left end of the other end electrical connection privates of the 3rd resistance;
Described the first wire, the second wire, privates right-hand member do not contact each other, and be provided with insulation protective jacket;
Temperature sensor is electrically connected with the controller;
The voltage signal at the first resistance two ends is input to controller by the oneth AD unit;
The voltage signal at the second resistance two ends is input to controller by the 2nd AD unit;
The voltage signal at the 3rd resistance two ends is input to controller by the 3rd AD unit;
The input of display unit is connected with the display signal output port of controller;
The input of alarm unit is connected with the alarm signal output ends mouth of controller;
The resistance of described the first resistance, the second resistance and the 3rd resistance is equal; The resistance of described the first resistance, the second resistance and the 3rd resistance is 1 ohm;
The external diameter of described the first wire, the second wire and privates is equal to 3cm, and the thickness of insulating layer of described the first wire, the second wire and privates is 1mm;
The first described DC source and the voltage of the second DC source are equal, are 30V;
Described controller adopts AT89S52 chip microcontroller; Described display unit adopts LCD1864 display screen; Described alarm unit adopts buzzer warning.
2. high voltage power transmission power cable according to claim 1, it is characterised in that the length of power cable is 2000 meters, first wire, the second wire, the length of privates also just respectively 2000 meters, first wire, the second wire, the resistance of privates respectively 10 ohm, first resistance, the second resistance, the 3rd resistance is 1 ohm, ensure that the first resistance, second resistance, the voltage at the 3rd resistance two ends is not over 5V, and such AD unit could normal operation.
3. high voltage power transmission power cable according to claim 1, it is characterised in that when simply the first wire and the second wire define closed-loop path;
First, by the voltage at the first resistance two ends resistance divided by the first resistance, the electric current of closed-loop path is obtained;
Secondly, the voltage of the first DC source, divided by the electric current of closed-loop path, has calculated the all-in resistance of closed-loop path, and all-in resistance deducts the first resistance and the resistance of the second resistance, namely obtains the first wire and the total resistance value of the second wire;
Finally, by formula R=�� L/S, thus calculating theft place; Wherein, �� and S is known parameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610152697.3A CN105655042A (en) | 2014-12-10 | 2014-12-10 | High-voltage transmission power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610152697.3A CN105655042A (en) | 2014-12-10 | 2014-12-10 | High-voltage transmission power cable |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410752611.1A Division CN104392797B (en) | 2014-12-10 | 2014-12-10 | High voltage power transmission power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105655042A true CN105655042A (en) | 2016-06-08 |
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ID=56493942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610152697.3A Pending CN105655042A (en) | 2014-12-10 | 2014-12-10 | High-voltage transmission power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105655042A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2258525Y (en) * | 1994-09-30 | 1997-07-30 | 吕杰 | Alarm rope lock |
| CN1624812A (en) * | 2003-12-03 | 2005-06-08 | Lg电线有限公司 | Optical fiber composite electrical power cable |
| CN1801403A (en) * | 2005-01-09 | 2006-07-12 | 谢志浩 | Anti-theft cable |
| JP2007042400A (en) * | 2005-08-02 | 2007-02-15 | Fujikura Ltd | Coaxial cable |
| CN200979583Y (en) * | 2006-10-20 | 2007-11-21 | 成都科鑫电气有限公司 | An intelligent positioning device for the breakpoint and of the cable and the mix line |
| CN201117323Y (en) * | 2007-08-29 | 2008-09-17 | 王世祥 | Anti-theft cable |
| US20120105230A1 (en) * | 2010-10-27 | 2012-05-03 | Thomas Bockstoce | Anti-theft sensor system |
| CN202373364U (en) * | 2011-11-14 | 2012-08-08 | 常州市亚达铜业有限公司 | Conducting wire scattered cable |
-
2014
- 2014-12-10 CN CN201610152697.3A patent/CN105655042A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2258525Y (en) * | 1994-09-30 | 1997-07-30 | 吕杰 | Alarm rope lock |
| CN1624812A (en) * | 2003-12-03 | 2005-06-08 | Lg电线有限公司 | Optical fiber composite electrical power cable |
| CN1801403A (en) * | 2005-01-09 | 2006-07-12 | 谢志浩 | Anti-theft cable |
| JP2007042400A (en) * | 2005-08-02 | 2007-02-15 | Fujikura Ltd | Coaxial cable |
| CN200979583Y (en) * | 2006-10-20 | 2007-11-21 | 成都科鑫电气有限公司 | An intelligent positioning device for the breakpoint and of the cable and the mix line |
| CN201117323Y (en) * | 2007-08-29 | 2008-09-17 | 王世祥 | Anti-theft cable |
| US20120105230A1 (en) * | 2010-10-27 | 2012-05-03 | Thomas Bockstoce | Anti-theft sensor system |
| CN202373364U (en) * | 2011-11-14 | 2012-08-08 | 常州市亚达铜业有限公司 | Conducting wire scattered cable |
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Application publication date: 20160608 |
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| WD01 | Invention patent application deemed withdrawn after publication |