CN105632630A

CN105632630A - Power cable for high-voltage power transmission

Info

Publication number: CN105632630A
Application number: CN201610164676.3A
Authority: CN
Inventors: 谢明臣
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-12-10
Filing date: 2014-12-10
Publication date: 2016-06-01
Also published as: CN104464934A; CN104464934B

Abstract

The invention discloses a power cable for high-voltage power transmission. The power cable comprises four cable cores, wherein the cross sections of three cable cores just form a circular ring; the cross section of the other one cable core is in a round shape; the cable core with the round cross section is positioned inside a cavity formed by the other three cable cores; an insulation layer and a shielding layer are sequentially arranged outside the cable core with the round cross section from inside to outside; the outer surface of each of the three cable cores of which the cross sections just form the circular ring is provided with an insulation layer; a water blocking layer and a protection layer are sequentially arranged outside each of the three cable cores of which the cross sections just form the circular ring from inside to outside; the power cable comprises a first conducting wire, a second conducting wire and a third conducting wire; the outer diameters of the first conducting wire, the second conducting wire and the third conducting wire are pairwise tangent; the first conducting wire, the second conducting wire and the third conducting wire are arranged in the protection layer; and each of the first conducting wire, the second conducting wire and the third conducting wire is parallel to the cable cores. The power cable has the advantage that the stealing place can be immediately known at the stealing moment of the protection layer of the power cable by a thief.

Description

High pressure transmission of electricity power cable

Point case application of patent application that the application to be the applying date be on December 10th, 2014, application number are 201410755810.8, denomination of invention is " high pressure transmission of electricity power cable ".

Technical field

The present invention relates to a kind of high pressure transmission of electricity power cable, belong to high pressure technical field of electric power transmission.

Background technology

Along with the fast development of national economy, the consumption of power cable and use range as national economy aorta are increasing. Power cable is the cable for transmitting and distribute electric energy. Be usually used in underground, city electrical network, the lead line in power house, the inside of industrial and mining enterprises powers and crosses the submarine transmission line in river, excessively sea. In electric power circuit, the proportion shared by power cable increases just gradually. Power cable is in order to the cable product of transmission and distribution high-power power in the trunk circuit of power system, comprising 1-500KV and above various voltage range, and the power cable of various insulation.

The basic structure of power cable is made up of core (conductor), insulation layer, screen layer and protective layer four part. Core is the conduction part of power cable, is used for transmission of electric energy, is the major portion of power cable. Insulation layer is isolated from each other between core and the earth and out of phase core on electrically, ensures electric energy conveying, is integral part indispensable in power cable structure. Screen layer, because the current ratio that electric power cable passes through is relatively big, can produce magnetic field around electric current, in order to not affect other element, and can be electromagnetic-field-shielded in cable this kind so adding screen layer. The effect of protective layer protects power cable from the intrusion of extraneous impurity and moisture, and prevents external force from directly damaging power cable.

Power cable can be divided into core and protective layer (protective layer refers to insulation layer, screen layer and protective layer) two parts structure; the core being positioned at innermost layer is for electric energy transmitting; the protective layer being rolled in outside core has multilayered structure, realizes the functions such as shielding, insulation, anti-outside destroy respectively. At high pressure and above defeated, distribution network; owing to voltage is higher, theft live electric cable often can cause thief's injures and deaths, therefore; it is not rush the copper material of wire that present robber steals electric power circuit, has occurred a lot of 10kV stolen event of power cable protective layer in this year. Owing to cable running is hidden, and the anti-system of prison is not set, therefore stolen not the causing of cable protective layer has a power failure and short circuit not easily being found of accident, but leaves very big potential safety hazard. After some cable protective layers 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, operation superpotential, thunder and lightning superpotential, harmonic wave superpotential, personnel trample, damaged by rats, all will trigger short circuit, and a certain phase is short-circuit explodes, often cause many feeder lines short circuit simultaneously of laying in one ditch, cause large-area power-cuts, it thus is seen that robber has buried the serious potential safety hazard in many places to power system. Due to many protective layers stolen after cable be imbedded in underground, power department does not have the safe situation of special monitoring of equipment cable so far, cannot learn that the protective layer of power cable is destroyed, thus remedial measures can not be taked in time, make the safety of power system and periphery personnel and environment be subject to serious threat.

By above description, it is possible to find just can find at once when theft power cable protective layer for robber and the place that navigates to theft is the problem highly studied.

Space availability ratio between existing power cable core and core is very low, and comparing of causing that power cable does is thick.

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 protective layer of high pressure transmission of electricity power cable, leave very big potential safety hazard to transmitting line, just can't find theft place at present when robber steals high pressure transmission of electricity power cable protective layer at once. 2nd, the space availability ratio between existing power cable core and core is very low, and comparing of causing that power cable does is thick.

In order to realize solving above technical problem, the technical solution adopted in the present invention is: high pressure transmission of electricity power cable, comprises four cores; Wherein the cross section of three cores forms an annulus just; Another root core cross section is circular; The rounded core in cross section is positioned at the inside cavity of other three cores composition; The outside of the core that cross section is rounded arranges insulation layer, screen layer from inside to outside successively;

The outside surface of three cores that cross section forms an annulus just is provided with insulation layer; The outside that cross section forms three cores of an annulus just arranges water blocking layer, protective layer from inside to outside successively;

Also comprise the first wire, the 2nd wire, privates; The external diameter of described the first wire, the 2nd wire, privates is tangent between two; Described the first wire, the 2nd wire, privates are arranged in protective layer; Described the first wire, the 2nd wire, privates are parallel with core respectively;

Also comprise the first resistance, the 2nd resistance, the 3rd resistance, an AD unit, the 2nd AD unit, the 3rd AD unit, controller, display unit, warning unit, the first direct supply, the 2nd direct supply;

The left end of the first described wire is electrically connected one end of the first resistance, the other end of the first resistance is electrically connected the positive wiring end of the first direct supply, one end of negative wiring end electrical connection the 2nd resistance of the first direct supply, the left end of the other end electrical connection the 2nd wire of the 2nd resistance;

The negative wiring end of the first direct supply is electrically connected the positive wiring end of the 2nd direct supply simultaneously; One end of negative wiring end electrical connection the 3rd resistance of the 2nd direct supply, the left end of the other end electrical connection privates of the 3rd resistance;

The right-hand member of described the first wire, the 2nd wire, privates does not contact each other, and is provided with insulation protective jacket;

The voltage signal at the first resistance two ends is input to controller by the one AD unit;

The voltage signal at the 2nd 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 terminus of display unit is connected with the display output port of controller;

The input terminus of warning unit is connected with the alarm signal output ends mouth of controller.

Further, the resistance of described the first resistance, the 2nd resistance and the 3rd resistance is equal.

Further, the resistance of described the first resistance, the 2nd resistance and the 3rd resistance is 1 ohm.

Further, the external diameter of described the first wire, the 2nd wire and privates is equal, and thickness of insulating layer is all less than 3mm.

Further, the thickness of insulating layer of described the first wire, the 2nd wire and privates is 1mm.

Further, the first described direct supply is equal with the voltage of the 2nd direct supply, thus is convenient to 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 warning unit adopts hummer to report to the police. Robber can be had at theft power cable like this 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 pressure provided by the invention transmission of electricity power cable, when robber steals the place that just can immediately know theft that time of power cable protective layer, effectively protects the safety of transmitting line; Meanwhile, because robber wants to steal the words of core, it is necessary to first destroy protective layer, so the power cable of the present invention also effectively prevent robber steals power cable core, and do not consume electric energy when not yet forming loop line. Meanwhile, the space availability ratio between the power cable core of the present invention and core is very high, and it is thinner that power cable does.

Accompanying drawing explanation

Fig. 1 is the structural representation of high pressure of the present invention transmission of electricity power cable.

Wherein, 1 is core; 2 is insulation layer; 3 is screen layer; 4 is protective layer; 9 is water blocking layer.

Fig. 2 is three tangent schematic diagram of wire in protective layer.

Wherein, 5 is the first wire; 6 is the 2nd wire; 7 is privates; 8 is protective layer.

Fig. 3 is the theft point Real-Time Monitoring circuit principle schematic that the present invention relates to.

Embodiment

Below in conjunction with accompanying drawing, invention is described in further detail.

With reference to Fig. 1,2,3, high pressure transmission of electricity power cable, comprises four cores; Wherein the cross section of three cores forms an annulus just; Another root core cross section is circular; The rounded core in cross section is positioned at the inside cavity of other three cores composition; The outside of the core that cross section is rounded arranges insulation layer, screen layer from inside to outside successively; The outside surface of three cores that cross section forms an annulus just is provided with insulation layer; The outside that cross section forms three cores of an annulus just arranges water blocking layer, protective layer from inside to outside successively; Also comprise the first wire, the 2nd wire, privates; The external diameter of described the first wire, the 2nd wire, privates is tangent between two; Described the first wire, the 2nd wire, privates are arranged in protective layer; Described the first wire, the 2nd wire, privates are parallel with core respectively; Also comprise the first resistance, the 2nd resistance, the 3rd resistance, an AD unit, the 2nd AD unit, the 3rd AD unit, controller, display unit, warning unit, the first direct supply, the 2nd direct supply; The left end of the first described wire is electrically connected one end of the first resistance, the other end of the first resistance is electrically connected the positive wiring end of the first direct supply, one end of negative wiring end electrical connection the 2nd resistance of the first direct supply, the left end of the other end electrical connection the 2nd wire of the 2nd resistance; The negative wiring end of the first direct supply is electrically connected the positive wiring end of the 2nd direct supply simultaneously; One end of negative wiring end electrical connection the 3rd resistance of the 2nd direct supply, the left end of the other end electrical connection privates of the 3rd resistance; The right-hand member of described the first wire, the 2nd wire, privates does not contact each other, and is provided with insulation protective jacket; The voltage signal at the first resistance two ends is input to controller by the one AD unit; The voltage signal at the 2nd 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 terminus of display unit is connected with the display output port of controller; The input terminus of warning 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 warning unit adopts hummer to report to the police, and can have robber at theft power cable by sound prompting like this, 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 2nd 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, so the first wire, the 2nd wire, the length of privates is also just respectively 2000 meters, the first wire, the 2nd wire, the resistance of privates is respectively 10 ohm, and the voltage of the first direct supply and the 2nd direct supply all selects 30V, the first resistance, 2nd resistance, 3rd resistance is 1 ohm, so that it is guaranteed that the first resistance, the 2nd resistance, the voltage at the 3rd resistance two ends can not more than 5V, and such AD unit could normal operation.

The present invention can realize the principle stealing some Real-Time Monitoring: no matter robber steals the core of power cable, or (protective layer comprises insulation layer to the protective layer of theft power cable, screen layer and protective layer), so all need first to destroy protective layer, owing to protective layer is durable, generally it is not easy to destroy, therefore robber must adopt metal clipper to cut off protective layer, and inside protective layer, it is provided with the first wire, 2nd wire, privates, due to the first wire, 2nd wire, the external diameter of privates is tangent between two and the insulation layer of wire is all very thin, in time adopting scissors to cut off protective layer, necessarily can by the first wire, 2nd wire, privates is also cut off, exactly at scissors by the first wire, 2nd wire, privates is cut off at that moment, first wire, 2nd wire, the conductor of privates inside is connected to one piece by metal clipper, the conductor at least having two wires can be electrically connected by metal clipper, also the conductor of possibility three wires all can be electrically connected by metal clipper.

At this time, the circuit in the present invention just defines loop line, it is possible to be that the first wire and the 2nd wire form loop line, it is also possible to be that the 2nd wire and privates form loop line, it is also possible to form two loop lines simultaneously. Once controller detects the first resistance, the 2nd resistance or the 3rd resistance two ends have voltage just can judge to have robber stealing power cable.

If, just the first wire and the 2nd wire define loop line;

First, by the resistance of the voltage at the first resistance two ends divided by the first resistance, obtain the electric current of loop line;

Secondly, the voltage of the first direct supply, divided by the electric current of loop line, has calculated the total electrical resistance of loop line, and total electrical resistance subtracts the first resistance and the resistance of the 2nd resistance, namely obtains the first wire and the total resistance value of the 2nd wire;

Finally, by formula R=�� L/S, thus calculate theft place. (�� and S is known parameters).

Claims

1. high pressure transmission of electricity power cable, it is characterised in that, comprise four cores; Wherein the cross section of three cores forms an annulus just; Another root core cross section is circular; The rounded core in cross section is positioned at the inside cavity of other three cores composition; The outside of the core that cross section is rounded arranges insulation layer, screen layer from inside to outside successively;

The outside surface of three cores that cross section forms an annulus just is provided with insulation layer;

The outside that cross section forms three cores of an annulus just arranges water blocking layer, protective layer from inside to outside successively;

The resistance of described the first resistance, the 2nd resistance and the 3rd resistance is equal; The resistance of described the first resistance, the 2nd resistance and the 3rd resistance is 1 ohm;

The external diameter of described the first wire, the 2nd wire and privates is equal is 3cm, and the thickness of insulating layer of described the first wire, the 2nd wire and privates is 1mm;

The first described direct supply is equal with the voltage of the 2nd direct supply, is 30V.

2. high pressure according to claim 1 transmission of electricity power cable, it is characterised in that, the length of power cable is 2000 meters, first wire, the 2nd wire, the length of privates is also just respectively 2000 meters, first wire, the 2nd wire, the resistance of privates is respectively 10 ohm, first resistance, the 2nd resistance, the 3rd resistance is 1 ohm, so that it is guaranteed that first resistance, 2nd resistance, the voltage at the 3rd resistance two ends can not more than 5V, and such AD unit could normal operation.

3. high pressure according to claim 1 transmission of electricity power cable, it is characterised in that, when just the first wire and the 2nd wire define loop line;

Finally, by formula R=�� L/S, thus calculate theft place; Wherein, �� and S is known parameters.