CN201117323Y - Anti-theft cable - Google Patents
Anti-theft cable Download PDFInfo
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- CN201117323Y CN201117323Y CNU2007200563079U CN200720056307U CN201117323Y CN 201117323 Y CN201117323 Y CN 201117323Y CN U2007200563079 U CNU2007200563079 U CN U2007200563079U CN 200720056307 U CN200720056307 U CN 200720056307U CN 201117323 Y CN201117323 Y CN 201117323Y
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Abstract
The utility model discloses a burglar-proof cable, which comprises a cable core, a shielding layer, an external protective layer and a burglar-proof line conductor, which is characterized in that the burglar line conductor is distributed on the outer portion of the cable core in winding form. The burglar-proof cable of the utility model can send out warning signals before burglars try to cut the cable core layer, thereby effectively preventing burglars to steal, and can connect with an alarming device to send out the alarming signals when the protective layer and the shielding layer of the cable in operation are accidentally injured, thereby being convenient for maintaining the cable, and reducing the loss which is caused by the fracture of the cable.
Description
Technical field
The utility model relates to a kind of cable, relates in particular to a kind of antitheft cable.
Background technology
One of them factor that influences electricity net safety stable is the theft of thief to power equipment.According to interrelated data statistics, on the annual stolen cable and wire 100, number and scale are increasing.Find that from relevant case theft cable of 10kV and substation transformer neutral ground cable are especially frequent, the secondary cable of protection usefulness is also often stolen.Therefore, prevent the stolen problem that presses for solution that becomes of cable.
The antitheft cable of prior art; as shown in Figure 1, described antitheft cable comprises external protection 1 and inner protective layer 2, by increase by one group of antitheft lead 5 in many group insulated conductors 3 or optical fiber 3; described antitheft wire 5 is wrapped with metal screen layer 4, reaches antitheft purpose.Yet; present thief is more and more clever; modus operandi is more and more brilliant; show according to related data; thief is normally used the external protection and the inner protective layer of instrument strip off cable earlier; whether test cable heart yearn (being many groups insulated conductor or optical fiber shown in Figure 1) is charged again, whether cuts off cable with decision.
The antitheft cable of prior art, obviously can not prevent the theft of this situation, because it designs antitheft wire in cable core, thief fully can be under the situation that does not touch antitheft wire, with the outer jacket strip off of cable, steal the cable core of most worthy.
Therefore, the shortcoming of prior art antitheft cable is that thief just can be corrupted to antitheft wire after cutting to cable core, can not play substantial antitheft effect.
Summary of the invention
The utility model embodiment technical problem to be solved is, a kind of antitheft cable is provided, and can effectively stop the loss that cable is stolen or the minimizing cable breakage brings.
The utility model embodiment provide a kind of can antitheft effectively cable, comprising: cable core, screen, external protection and antitheft wire, described antitheft wire are and twine shape and be distributed in outside the described cable core.
Wherein, described antitheft wire is embedded in the described external protection or in the screen or be distributed between described screen and the described external protection.
Wherein, described antitheft wire is an optical fiber.
Wherein, describedly be at least two by optical fiber, and per two optical fiber form one group, optical fiber one end of described each group interconnects, and other end device taking alarm is formed the loop.
Wherein, described antitheft wire is copper cash, aluminum steel, iron wire or alloy wire.
Wherein, described antitheft wire is at least two, and per two antitheft wires form one group, and an end of described each group antitheft wire and described screen be ground connection together, other end device taking alarm, composition loop.
Wherein, described antitheft wire is wrapped with metal screen layer, and described metal screen layer is formed by copper cash or silver-coated copper wire braiding; Perhaps be entwined by the aluminium film or the organic membrane of aluminizing.
Wherein, when two described interconnective same group antitheft wires of antitheft cable one end were in off-state, the described warning device that is connected with described antitheft wire then can send alarm signal.
Implement the utility model, have following beneficial effect:
By antitheft wire is set outside cable core, before thief attempt cutting cable core layer, just can send alarm signal, can stop thief to be stolen effectively;
In addition, the cable that is moving is at the protective layer of being accidentally injured outside the cable core, and during screen, the warning device that is connected with antitheft cable also can send alarm signal, so that antitheft cable is safeguarded, reduces the loss that cable thoroughly ruptures and brings.
Description of drawings
Fig. 1 is the schematic diagram of existing antitheft cable;
Fig. 2 a is the structural representation of first embodiment of the antitheft cable that provides of the utility model;
Fig. 2 b is the structural representation of second embodiment of the antitheft cable that provides of the utility model
Fig. 3 a is the structural representation of the 3rd embodiment of the antitheft cable that provides of the utility model;
Fig. 3 b is the structural representation of the 4th embodiment of the antitheft cable that provides of the utility model;
Fig. 4 a is the structural representation of the 5th embodiment of the antitheft cable that provides of the utility model;
Fig. 4 b is the structural representation of the 6th embodiment of the antitheft cable that provides of the utility model;
Fig. 5 a is the structural representation of the 7th embodiment of the antitheft cable that provides of the utility model;
Fig. 5 b is the structural representation of the 8th embodiment of the antitheft cable that provides of the utility model;
Fig. 5 c is the partial schematic diagram of the antitheft wire among Fig. 5 b;
Fig. 6 is the schematic diagram of screen one point earth in the antitheft cable that provides of the utility model embodiment;
Fig. 7 is the equivalent circuit diagram of Fig. 6;
Fig. 8 is the schematic diagram of 2 ground connection of screen in the antitheft cable that provides of the utility model embodiment;
Fig. 9 is the schematic diagram of the flat magnetic field of shielded type cable in the antitheft cable that provides of the utility model embodiment;
Figure 10 is the equivalent circuit diagram of Fig. 8;
Figure 11 a is the schematic diagram of first embodiment that is connected with warning device of antitheft cable that the utility model embodiment provides;
Figure 11 b is the schematic diagram of first embodiment that is connected with warning device of antitheft cable that the utility model embodiment provides.
Embodiment
The utility model is implemented a kind of antitheft cable is provided, and the warning device that is connected with antitheft cable can give the alarm when cable is cut or be damaged, and effectively stops the loss that cable is stolen or the minimizing cable breakage brings.
Referring to Fig. 2 a, the schematic diagram of first embodiment of the antitheft cable that provides for the utility model;
Antitheft cable as shown in the figure; comprise cable core 1, screen 2 and antitheft wire; and external protection 4; described cable core 1 is made up of three cores; the magnetic field induction electric current that each bar cable core of three-core cable as shown in the figure produces is cancelled out each other; and antitheft wire is at least two an optical fiber composition; 30a as shown in the figure, 30b, 31a, 31b; wherein 30a and 30b are one group; 31a and 31b are one group; they are parallel to each other each other, and parallel with cable core, are the winding shape and are distributed in outside the described cable core.In practical application, optical fiber 30a, 30b, 31a, 31b can distinguish with different colors, are convenient to construction and maintenance.At an end of cable, each organizes optical fiber, for example 30a and 30b, and 31a and 31b interconnect by fiber connector 6, and two optical fiber in one group of the other end of cable are devices taking alarm respectively, form a loop.Need to prove that described antitheft wire has only one group also can realize same anti-theft feature, many one group then can be used as standbyly, and in addition, antitheft wire also can be three, and wherein two is one group, and another is as standby.
In specific implementation; in first kind of embodiment; describedly form antitheft wire by optical fiber and be embedded in described 4 external protections; in second kind of embodiment; described optical fiber can be embedded in the screen 2; or at the third embodiment; described optical fiber can be distributed between described screen 2 and the described external protection 4 Anywhere; the diagram that it is pointed out that the utility model embodiment is the general composition schematic diagram of secondary three-core cable, in the secondary three-core cable; described screen 2 is rolled in outside three cable cores; in the composition of a three-core cable, outside described each bar cable core, all be wrapped with screen 2 respectively.In the practical application; cable is made up of following from the inside to surface: cable core 1; generally form by copper cash stranded conductor or aluminum steel stranded conductor; screen 1, inner protective layer, steel-tape armouring, external protection 4 and outmost insulating barrier wait composition, therefore; the antitheft wire that the utility model embodiment provides; can also constitute according to the cable of reality, it is embedded in the external protection 4, in the inner protective layer, perhaps is arranged between any layer between cable core 1 and the external protection 4.
In the present embodiment, two optical fiber that are parallel to each other of interconnective same group of antitheft cable one end with disconnect each other after, the warning device that antitheft wire connect of the antitheft cable other end then can be reported to the police.
Referring to Fig. 2 b, the schematic diagram of second embodiment of the antitheft cable that provides for the utility model;
With first shown in Fig. 2 a implement the antitheft cable provide different be that the antitheft wire of the antitheft cable that provides in the present embodiment is made up of copper cash or aluminum steel or iron wire or metal alloy wire.Described antitheft wire is parallel to each other, annular is wrapped in outside the cable core, end at cable, the antitheft wire that each group is made up of copper cash or aluminum steel or iron wire or metal alloy wire, for example 30a and 30b, the end of 31a and 31b and described screen 2 be ground connection together, and two described leads in one group of the other end of cable are devices taking alarm respectively, form a lattice loop.
Wherein, described antitheft wire 30a, 30b, 31a, the 31b that is made up of copper cash or aluminum steel or iron wire or metal alloy wire is that sectional area is 0.05mm
2-1.5mm
2Copper cash, aluminum steel, iron wire or alloy wire, preferably, can be 0.05mm
2Copper cash, aluminum steel, iron wire or alloy wire, perhaps 1.0mm
2Copper cash, aluminum steel, iron wire or alloy wire, perhaps 1.5mm
2Copper cash, aluminum steel, iron wire or alloy wire, these all are those skilled in the art's technique known.Here the scope of copper cash or aluminum steel or iron wire or metal alloy wire just illustrates, and can not limit core concept of the present invention with this.
Need to prove that in the present embodiment, except antitheft wire was made up of copper cash or aluminum steel or iron wire or metal alloy wire, the antitheft cable that provides among the function of other parts of cable and effect and first embodiment was the same, is not giving unnecessary details at this.
Referring to Fig. 3 a, the schematic diagram of the 3rd embodiment of the antitheft cable that provides for the utility model;
Antitheft cable as shown in the figure; comprise cable core 1, screen 2 and antitheft wire; and external protection 4; described cable core 1 is made up of three cores; the magnetic field induction electric current that each bar cable core of three-core cable as shown in the figure produces is cancelled out each other, and antitheft wire is at least two an optical fiber composition, 30a as shown in the figure, 30b, 31a; they are parallel to each other each other, twine shape ringwise and are distributed in outside the described cable core.In practical application, antitheft wire 30a, 30b, 31a can distinguish with different colors, are convenient to construction and maintenance.At an end of cable, each organizes optical fiber, for example 30a and 30b, and 31a and 30b interconnect by fiber connector 6, and two optical fiber in one group of the other end of cable are devices taking alarm respectively, form a loop.Need to prove that described antitheft wire has only one group also can realize same anti-theft feature, many one group then can be used as standbyly, and in addition, antitheft wire also can be three, and wherein two is one group, and another is as standby.
In specific implementation; in first kind of embodiment; describedly form antitheft wire by optical fiber and be embedded in described 4 external protections; in second kind of embodiment; described optical fiber can be embedded in the screen 2; or at the third embodiment; described optical fiber can be distributed between described screen 2 and the described external protection 4 Anywhere; the diagram that it is pointed out that the utility model embodiment is the general composition schematic diagram of secondary three-core cable, in the secondary three-core cable; described screen 2 is rolled in outside three cable cores; in the composition of a three-core cable, outside described each bar cable core, all be wrapped with screen 2 respectively.In the practical application; cable is made up of following from the inside to surface: cable core 1; generally form by copper cash stranded conductor or aluminum steel stranded conductor; screen 1, inner protective layer, steel-tape armouring, external protection 4 and outmost insulating barrier wait composition, therefore; the antitheft wire that the utility model embodiment provides; can also constitute according to the cable of reality, it is embedded in the external protection 4, in the inner protective layer, perhaps is arranged between any layer between cable core 1 and the external protection 4.
In the present embodiment, two optical fiber of interconnective same group of antitheft cable one end and being wrapped on the screen in the mode of ring-type, with disconnect each other after, the warning device that antitheft wire connect of the antitheft cable other end then can be reported to the police.
Referring to Fig. 3 b, the schematic diagram of the 4th embodiment of the antitheft cable that provides for the utility model;
With first shown in Fig. 3 a implement the antitheft cable provide different be that the antitheft wire of the antitheft cable that provides in the present embodiment is made up of copper cash or aluminum steel or iron wire or metal alloy wire.Described antitheft wire is parallel to each other, annular is wrapped in outside the cable core, end at cable, the antitheft wire that each group is made up of copper cash or aluminum steel or iron wire or metal alloy wire, for example 30a and 30b, the end of 31a and 31b and described screen 2 be ground connection together, and two described leads in one group of the other end of cable are devices taking alarm respectively, form a loop.
Wherein, described antitheft wire 30a, 30b, 31a, the 31b that is made up of copper cash or aluminum steel or iron wire or metal alloy wire is that sectional area is 0.05mm
2-1.5mm
2Copper cash, aluminum steel, iron wire or alloy wire, preferably, can be 0.05mm
2Copper cash, aluminum steel, iron wire or alloy wire, perhaps 1.0mm
2Copper cash, aluminum steel, iron wire or alloy wire, perhaps 1.5mm
2Copper cash, aluminum steel, iron wire or alloy wire, these all are those skilled in the art's technique known.Here the scope of copper cash or aluminum steel or iron wire or metal alloy wire just illustrates, and can not limit core concept of the present invention with this.
Need to prove that in the present embodiment, except antitheft wire was made up of copper cash or aluminum steel or iron wire or metal alloy wire, the antitheft cable that provides among the function of other parts of cable and effect and the 3rd embodiment was the same, is not giving unnecessary details at this.
Referring to Fig. 4 a, the schematic diagram of the 5th embodiment of the antitheft cable that provides for the utility model;
Antitheft cable as shown in the figure; comprise cable core 1, screen 2 and antitheft wire; and external protection 4; described cable core 1 is made up of three cores; the magnetic field induction electric current that each bar cable core of three-core cable as shown in the figure produces is cancelled out each other, and antitheft wire is at least two an optical fiber composition, 30a as shown in the figure, 30b, 31a; they are interlaced each other, twine to be distributed in outside the described cable core.In practical application, antitheft wire 30a, 30b, 31a can distinguish with different colors, are convenient to construction and maintenance.At an end of cable, each organizes optical fiber, for example 30a and 30b, and 31a and 30b interconnect by fiber connector 6, and two optical fiber in one group of the other end of cable are devices taking alarm respectively, form a loop.Need to prove that described antitheft wire has only one group also can realize same anti-theft feature, many one group then can be used as standbyly, and in addition, antitheft wire also can be three, and wherein two is one group, and another is as standby.
In specific implementation; in first kind of embodiment; describedly form antitheft wire by optical fiber and be embedded in described 4 external protections; in second kind of embodiment; described optical fiber can be embedded in the screen 2; or at the third embodiment; described optical fiber can be distributed between described screen 2 and the described external protection 4 Anywhere; the diagram that it is pointed out that the utility model embodiment is the general composition schematic diagram of secondary three-core cable, in the secondary three-core cable; described screen 2 is rolled in outside three cable cores; in the composition of a three-core cable, outside described each bar cable core 1, all be wrapped with screen 2 respectively.In the practical application; cable is made up of following from the inside to surface: cable core 1; generally form by copper cash stranded conductor or aluminum steel stranded conductor; screen 1, inner protective layer, steel-tape armouring, external protection 4 and outmost insulating barrier; Deng composition; therefore; what the utility model embodiment provided forms antitheft wire by optical fiber; can also constitute according to the cable of reality; it is embedded in the external protection 4, in the inner protective layer, perhaps is arranged between any layer between cable core 1 and the external protection 4.
In the present embodiment, interconnective same group optical fiber of antitheft cable one end with disconnect each other after, the warning device that antitheft wire connect of the antitheft cable other end then can be reported to the police.The advantage of present embodiment is, no matter how the thief cuts cable, all can touch optical fiber, thereby improve antitheft effect.
Referring to Fig. 4 b, the schematic diagram of the 6th embodiment of the antitheft cable that provides for the utility model;
With first shown in Fig. 4 a implement the antitheft cable provide different be that the antitheft wire of the antitheft cable that provides in the present embodiment is made up of copper cash or aluminum steel or iron wire or metal alloy wire.Described antitheft wire is interlaced to be wrapped in outside the cable core 1, end at cable, the antitheft wire that each group is made up of copper cash or aluminum steel or iron wire or metal alloy wire, for example 30a and 30b, the end of 31a and 31b and described screen 2 be ground connection together, two described leads in one group of the other end of cable are devices taking alarm respectively, form a loop.
Wherein, described antitheft wire 30a, 30b, 31a, the 31b that is made up of copper cash or aluminum steel or iron wire or metal alloy wire is that sectional area is 0.05mm
2-1.5mm
2Copper cash, aluminum steel, iron wire or alloy wire, preferably, can be 0.05mm
2Copper cash, aluminum steel, iron wire or alloy wire, perhaps 1.0mm
2Copper cash, aluminum steel, iron wire or alloy wire, perhaps 1.5mm
2Copper cash, aluminum steel, iron wire or alloy wire, these all are those skilled in the art's technique known.Here the scope of copper cash or aluminum steel or iron wire or metal alloy wire just illustrates, and can not limit core concept of the present invention with this.
Need to prove that in the present embodiment, except antitheft wire was made up of copper cash or aluminum steel or iron wire or metal alloy wire, the antitheft cable that provides among the function of other parts of cable and effect and the 5th embodiment was the same, is not giving unnecessary details at this.
Referring to Fig. 5 a, the schematic diagram of the 7th embodiment of the antitheft cable that provides for the utility model;
Antitheft cable as shown in the figure; comprise cable core 1, screen 2 and antitheft wire; and external protection 4; described cable core 1 is a core cable; and antitheft wire is at least two; 30a as shown in the figure, 30b, 31a, they are parallel each other, twine shape ringwise and are distributed in outside the described cable core 1.Need to prove that it is also passable to twine shape as above-mentioned form, is most preferred embodiment here.
In practical application, antitheft wire 30a, 30b, 31a can distinguish with different colors, are convenient to construction and maintenance.At an end of cable, each organizes optical fiber, for example 30a and 30b, and 31a and 30b interconnect by fiber connector 6, and two optical fiber in one group of the other end of cable are devices taking alarm respectively, form a loop.Need to prove that described antitheft wire has only one group also can realize same anti-theft feature, many one group then can be used as standbyly, and in addition, antitheft wire also can be three, and wherein two is one group, and another is as standby.
In specific implementation; in first kind of embodiment; describedly form antitheft wire by optical fiber and be embedded in described 4 external protections; in second kind of embodiment; described optical fiber can be embedded in the screen 2; or at the third embodiment; described optical fiber can be distributed between described screen 2 and the described external protection 4 Anywhere; the diagram that it is pointed out that the utility model embodiment is the general composition schematic diagram of secondary three-core cable, in the secondary three-core cable; described screen 2 is rolled in outside three cable cores; in the composition of a three-core cable, outside described each bar cable core, all be wrapped with screen 2 respectively.In the practical application; cable is made up of following from the inside to surface: cable core 1; generally form by copper cash stranded conductor or aluminum steel stranded conductor; screen 1, inner protective layer, steel-tape armouring, external protection 4 and outmost insulating barrier; Deng composition; therefore; the antitheft wire of forming by optical fiber that the utility model embodiment provides; can also constitute according to the cable of reality; it is embedded in the external protection 4, in the inner protective layer, perhaps is arranged between any layer between cable core 1 and the external protection 4.
Referring to Fig. 5 b, the schematic diagram of the 8th embodiment of the antitheft cable that provides for the utility model;
With first shown in Fig. 5 a implement the antitheft cable provide different be that the antitheft wire of the antitheft cable that provides in the present embodiment is made up of copper cash or aluminum steel or iron wire or metal alloy wire.Described antitheft wire is interlaced to be wrapped in outside the cable core 1, end at cable, the antitheft wire that each group is made up of copper cash or aluminum steel or iron wire or metal alloy wire, for example 30a and 30b, the end of 31a and 31b and described screen 2 be ground connection together, two described leads in one group of the other end of cable are devices taking alarm respectively, form a loop.
Wherein, described antitheft wire 30a, 30b, 31a, the 31b that is made up of copper cash or aluminum steel or iron wire or metal alloy wire is that sectional area is 0.05mm
2-1.5mm
2Copper cash, aluminum steel, iron wire or alloy wire, preferably, can be 0.05mm
2Copper cash, aluminum steel, iron wire or alloy wire, perhaps 1.0mm
2Copper cash, aluminum steel, iron wire or alloy wire, perhaps 1.5mm
2Copper cash, aluminum steel, iron wire or alloy wire, these all are those skilled in the art's technique known.Here the scope of copper cash or aluminum steel or iron wire or metal alloy wire just illustrates, and can not limit core concept of the present invention with this.
Described cable core 1 is a core cable, the magnetic field induction electric current of an antitheft wire and a cable core generation can not be offset mutually, referring to Fig. 5 c, it is the partial schematic diagram of the antitheft wire of forming by copper cash or aluminum steel or iron wire or metal alloy wire among Fig. 5 b, described antitheft wire also is wrapped with metal screen layer 5, described metal screen layer 5 can be the copper cash of 0.07mm-0.35mm by diameter, and the silver-coated copper wire braiding forms; For example by the copper cash of 0.07mm, 0.20mm, 0.35mm, the silver-coated copper wire braiding forms, and can be that 0.05mm-0.30mm aluminium film, the organic membrane of aluminizing are entwined by diameter also, for example is entwined by 0.05mm, 0.10mm, 0.30mm aluminium film, the organic membrane of aluminizing.These all are those skilled in the art's technique known.
Need to prove, in the present embodiment, except antitheft wire is made up of copper cash or aluminum steel or iron wire or metal alloy wire, and its outside also is enclosed with outside the metal screen layer 5, the function of other parts of cable is the same with the antitheft cable that provides among the 5th embodiment with effect, is not giving unnecessary details at this.
In the present embodiment, interconnective same group antitheft wire of antitheft cable one end with disconnect each other after, the warning device that antitheft wire connect of the antitheft cable other end then can be reported to the police.The advantage of present embodiment is, no matter how the thief cuts cable, all can touch antitheft wire, thereby improve antitheft effect, and by wrap up in metal screen layer outside antitheft wire, shield induced current, has avoided producing the danger of high pressure.
Antitheft cable shown in above-mentioned Fig. 2 a, Fig. 2 b, Fig. 3 a, Fig. 3 b, Fig. 4 a, Fig. 4 b and Fig. 5 a, Fig. 5 b has just been enumerated the winding shape of 3 kinds of antitheft wires, but can not have been limited embodiment of the present utility model with this.In addition, cable can not be limited on a core and two kinds of cables of three cores, and the cable core of other quantity is suitable equally; And antitheft wire can be wrapped up in metal screen layer in addition, also can not wrap up in metal screen layer, and this can decide on actual conditions fully.When connecing metal screen layer, can ground connection, to guarantee together when detecting antitheft wire, not receiving extraneous interference, in the communication cable of weak signal, can save this metal screen layer, to reduce cost.
In actual applications, 10kV cable and substation transformer neutral ground cable all have external protection, and insulating material has the screen two ends all to want ground connection with interior.Therefore it is designed to antitheft cable does not influence normal operation.
In addition, to be designed to the anti-theft type cable design be that antitheft cable does not influence normal operation yet to the secondary cable of protection usefulness.
Below protection is designed to the anti-theft cable with secondary cable and analyzes.
Referring to Fig. 6 is the schematic diagram of screen one point earth in the antitheft cable that provides of the utility model embodiment;
Owing to have coupling capacitance between two parallel wires, also there are coupling capacitance in screen and cable core, field coupled can produce the series connection interference like this, as shown in Figure 6, wherein dotted line is represented shielding layer grounding, in conjunction with the equivalent circuit diagram of Fig. 7, suppose that one is desirable shielded type cable, places interfered circuit.Do not consider the coupling of interference source lead to cable core, then the interference voltage U1 of source lead returns by C12 and is coupled on the screen, is coupled on the heart yearn by C23 again.
Coupled voltages is U2=C12/C12+C3 (1-1/j ω C23+1) U1 on the heart yearn
If shielding layer grounding, C3 be by short circuit, C3 is infinitely great, U2=0 then, and promptly U1 has cut off the path of being coupled on the heart yearn, thereby has played the effect of electric field shielding by C23 conductively-closed layer short circuit ground connection.If screen is earth-free, according to document, C12=(π ε 0)/[1n (2h/r)], h is two wire pitch, r is the lead radius.Because shielded type cable r value is bigger than common cable, coupling capacitance C12 value is higher, and is also higher at the coupled voltages U2 that produces according to formula, consequently not only can not reduce the electric field interference level, and will disturb than adopting common cable to produce bigger electric field.
Concerning suppressing the electric field interference, screen must ground connection as can be seen.
Referring to Fig. 8 is the schematic diagram of 2 ground connection of screen in the antitheft cable that provides of the utility model embodiment;
At first analyze the how conductively-closed layer shielding of magnetic interference that the cable internal core wire produces.
If US is an interference source, the disturbance current I1 of its generation, as shown in Figure 8.
Shielded type cable can be thought a parallel plane magnetic field, as shown in Figure 9.The length of DISTRIBUTION OF MAGNETIC FIELD and cable is irrelevant.Cable is round, and the magnetic field that it produced is symmetrical in the axis of cable, according to pressing training loop law
∮B·dl＝μ0I
2 π rB=μ 0I are promptly arranged, and in the formula: I=(I1-I2): r is that cable is outer a bit to cable center's distance; B is outer some magnetic field intensitys of cable.
Then the outer magnetic induction of cable should be
B＝μ0/2πr(I1-I2)
If shielded type cable is earth-free or single-end earthed.Then disturbance current returns from ground, and no current passes through on the screen, i.e. I2=0, and screen is inoperative.
Referring to equivalent circuit diagram shown in Figure 10, when the screen two-terminal-grounding, can equivalence be a mutual inductice coupled circuit between the heart yearn of shielded type cable and the screen then, establishing mutual inductance is M, as shown in figure 10, earth point is E1 point and E2 point, and I1 will be divided into I2 and IC flows back to source point through E1 at E2, and the electric current in the screen is I2=j ω MI1/j ω LS+rS, I2=j ω I1/j ω+ω 0, in the formula, ω 0=Rs/ZS promptly has I2＜I1.In the ideal case, ω " ω 0, I2 ≈ I1, substitution formula 2, B ≈ 0 as can be known.Even be not perfect condition, also can obviously reduce shielded type cable external magnetic field interference level.
In like manner, under the condition of 2 ground connection of screen, when the magnetic flux that is produced by the external disturbance electric current when cable surrounds, induce opposite electric current of direction and magnetic flux, will offset the influence of interference magnetic flux that the external disturbance electric current produces cable core at cable shield.Perfect condition B ≈ 0.
To sum up above-mentioned, 2 reliable types of ground connection are higher than one point earth, because one point earth must guarantee the intact of screen, and screen draws cage by 2 ground connection to one of the magnetic interference formation that magnetic flux surrounds the shielded type cable generation, makes its internal core significantly reduced by annoyance level.
Through above-mentioned protection is designed to the anti-theft cable with secondary cable shielding, if can not influence the operation of protection by the requirement construction of strictness.
Referring to Figure 11 a, be the schematic diagram of first embodiment that is connected with warning device of antitheft cable that the utility model embodiment provides.
Antitheft cable in the present embodiment; comprise cable core 1, screen 2 and antitheft wire; and the external protection 4 of insulating material composition; described cable core 1 is three cores; and described antitheft wire is that optical fiber is formed, and is wrapped in the concrete application that the outer antitheft cable of screen is an example explanation antitheft cable with annular.
In the time of concrete enforcement, terminal at antitheft cable interconnects one group of optical fiber by fiber connector 6, optical fiber 30a as shown in the figure is connected by light connector 6 with 30b, optical fiber 31a is then as standby, and leaning on transformer station or entering an indoor end, optical fiber 30a and 30b are inserted warning device, form a loop, when the people steals the light of firm damage cable, but when not damaging the cable core 1 of inside, device can add camera in the application of transformer station neutral point place and take pictures signal toward transformer station's transmission with regard to report to the police (or sending the alarm signal letter), above-mentioned signal all can be in central station (control centre) centralized displaying, and is processed into distinguishable signal.
Originally the advantage that is implemented in is, uses optical fiber as antitheft wire, can prevent to produce induced current, and before the thief does not also cut to cable core, just can report to the police, and has reduced loss effectively.
Referring to Figure 11 b, be the schematic diagram of second embodiment that is connected with warning device of antitheft cable that the utility model embodiment provides.
Antitheft cable in the present embodiment; comprise cable core 1, screen 2 and antitheft wire; and the external protection 4 of insulating material composition; described cable core 1 is three cores; and described antitheft wire is made up of copper cash or aluminum steel or iron wire or metal alloy wire, is wrapped in the concrete application that the outer antitheft cable of screen is an example explanation antitheft cable with annular.
In the time of concrete enforcement, in the terminal of antitheft cable with one group of antitheft wire together with screen ground connection, antitheft cable 30a as shown in the figure and 30b are together with screen 2 ground connection, and antitheft wire 31a six foldings are standby, and leaning on transformer station or entering an indoor end, antitheft wire 30a and 30b are inserted warning device, form a loop.When the people steals the antitheft wire of firm damage cable, but when not damaging inner cable core 1, just warning of device (or sending the alarm signal letter), can add camera in the application of transformer station neutral point place takes pictures signal toward transformer station's transmission, above-mentioned signal all can be in central station (control centre) centralized displaying, and is processed into distinguishable signal.
Need to prove, more than the warning device that provides among two kinds of embodiment, be a kind of execution mode, be used for the auxiliary effect of understanding the antitheft cable that the utility model provides, can not limit the scope of the antitheft cable that the utility model provides with this.
The above-mentioned various forms of antitheft cables that the utility model embodiment provides have the following advantages:
By antitheft wire is set outside cable core, before thief attempt cutting cable core layer, just can send alarm signal, can stop thief to be stolen effectively;
In addition, the cable that is moving is when being accidentally injured protective layer outside the cable core or screen, and connected warning device just can send alarm signal, so that it is safeguarded, reduces the thoroughly loss that brings of fracture of cable.
Above disclosed only is a kind of preferred embodiment of the utility model, can not limit the interest field of the utility model certainly with this, and therefore the equivalent variations of being done according to the utility model claim still belongs to the scope that the utility model is contained.
Claims (8)
1, a kind of antitheft cable comprises cable core, screen, external protection and antitheft wire, it is characterized in that, described antitheft wire is the winding shape and is distributed in outside the described cable core.
2, a kind of antitheft cable as claimed in claim 1 is characterized in that, described antitheft wire is embedded in the described external protection or in the screen or be distributed between described screen and the described external protection.
3, antitheft cable as claimed in claim 2 is characterized in that, described antitheft wire is an optical fiber.
4, antitheft cable as claimed in claim 3 is characterized in that, the described antitheft wire of being made up of optical fiber is at least two, and per two optical fiber form one group, and optical fiber one end of described each group interconnects, and other end device taking alarm is formed the loop.
5, antitheft cable as claimed in claim 2 is characterized in that, described antitheft wire is copper cash, aluminum steel, iron wire or metal alloy wire.
6, antitheft cable as claimed in claim 5 is characterized in that, described antitheft wire is at least two, and per two antitheft wires are formed one group, one end of described each group antitheft wire and described screen be ground connection together, and other end device taking alarm is formed the loop.
7, the antitheft cable described in claim 6 is characterized in that, described antitheft wire is wrapped with metal screen layer, and described metal screen layer is formed by copper cash or silver-coated copper wire braiding; Perhaps be entwined by the aluminium film or the organic membrane of aluminizing.
As claim 4 or 7 described antitheft cables, it is characterized in that 8, when two described interconnective same group antitheft wires of antitheft cable one end were in off-state, the described warning device that is connected with described antitheft wire then can send alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200563079U CN201117323Y (en) | 2007-08-29 | 2007-08-29 | Anti-theft cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200563079U CN201117323Y (en) | 2007-08-29 | 2007-08-29 | Anti-theft cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201117323Y true CN201117323Y (en) | 2008-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200563079U Expired - Fee Related CN201117323Y (en) | 2007-08-29 | 2007-08-29 | Anti-theft cable |
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| CN (1) | CN201117323Y (en) |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080917 |