CN114709025A - Rail transit information transmission cable shielding protection method and system - Google Patents
Rail transit information transmission cable shielding protection method and system Download PDFInfo
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- H—ELECTRICITY
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- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
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Abstract
The invention discloses a method and a system for shielding and protecting a track traffic information transmission cable, and belongs to the technical field of track traffic information transmission. Firstly, arranging at least one regulating and controlling point on an information transmission cable, and acquiring an induced longitudinal potential monitoring value on a core wire at each regulating and controlling point of the information transmission cable; then respectively determining the target value of the tuning coefficient at each regulating and controlling point based on each induced longitudinal potential monitoring value; and finally, respectively adjusting the tuning coefficients at the regulating and controlling points of the information transmission cable according to the target values of the tuning coefficients. According to the invention, the tuning coefficient at each regulation and control point of the information transmission cable is flexibly adjusted according to the value of the longitudinal induced electromotive force monitored on the information transmission cable, so that the mutual inductance between the shielding layer and the core wire at each regulation and control point is improved, the induced electromotive force generated on the information transmission cable is reduced, the shielding coefficient is effectively reduced to the set shielding coefficient target value, and the effective shielding protection effect is further achieved on the information transmission cable.
Description
Technical Field
The invention relates to the technical field of rail transit information transmission, in particular to a method and a system for shielding and protecting a rail transit information transmission cable.
Background
When the rail transit line adopts an alternating current traction power supply mode, the traction power supply system is easy to generate electromagnetic interference on information transmission cables laid along the line. Especially when the power supply mode is a direct power supply mode, the induced longitudinal potential generated on the information transmission cable laid along the line is more harmful, the maximum value of the actually measured induced longitudinal potential can reach 200 volts or more and far exceeds the allowable standard of 60 volts, personal safety and equipment safety are harmed, the personal safety of system maintenance personnel is dangerously affected, and the normal operation and the service life of the cable are seriously affected. Therefore, it is desirable to provide a method and a system for shielding and protecting a track traffic information transmission cable, so as to reduce the induced longitudinal potential generated on the information transmission cable by a track traffic traction power supply system.
Disclosure of Invention
The invention aims to provide a method and a system for shielding and protecting a track traffic information transmission cable, which are used for reducing induced electromotive force generated on the information transmission cable and improving the shielding and protecting effect on a core wire of the information transmission cable.
In order to achieve the purpose, the invention provides the following scheme:
a method for shielding and protecting a rail transit information transmission cable, the method comprising:
arranging at least one regulating and controlling point on the information transmission cable, and acquiring longitudinal induced electromotive force on a core wire at each regulating and controlling point of the information transmission cable to obtain a corresponding induced longitudinal potential monitoring value;
respectively determining the target value of the tuning coefficient at each regulation point based on each induced longitudinal potential monitoring value;
and respectively adjusting the tuning coefficients at the regulating and controlling points of the information transmission cable according to the target tuning coefficient values so as to reduce the shielding coefficient of the information transmission cable to the target shielding coefficient value.
Optionally, the calculation formula of the tuning coefficient target value is:
wherein λ is0,iIs a tuning coefficient target value, V, at the ith regulation point1,iThe induced longitudinal potential monitoring value V at the ith regulation point2,iAnd the voltage value to be eliminated at the ith regulation point is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
Optionally, the calculation formula of the voltage value to be eliminated is:
V2,i＝V1,i-V0,i；
V0,i＝γVi；
wherein, V2,iIs the voltage value V to be eliminated at the ith regulation point1,iThe induced longitudinal potential monitoring value V at the ith regulation point0,iA control target value of the induced longitudinal potential at the ith control point, gamma is a target value of the shielding coefficient of the information transmission cable, ViThe induced voltage of the core wire at the ith regulation point under the protection state of the unshielded layer is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
Optionally, the adjusting the tuning coefficients at the control points of the information transmission cable according to the tuning coefficient target values respectively specifically includes:
respectively adjusting the turn ratio of coils of the connecting core wire and the shielding layer at each control point of the information transmission cable until the current value of the tuning coefficient at each control point of the information transmission cable is respectively equal to the corresponding target value of the tuning coefficient; the shielding layer comprises an outer protective layer, a sheath and an armor layer which are wrapped outside the core wire of the information transmission cable.
Optionally, the calculation formula of the current value of the tuning coefficient is:
wherein λ is1,iIs the current value of the tuning coefficient at the ith regulation point, n1,iNumber of turns of coil, n, connecting core wire at i-th regulation point2,iThe number of turns of the coil connected with the shielding layer at the ith regulation point is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
The invention also provides a shielding protection system for the track traffic information transmission cable, which comprises: at least one regulatory module; the regulating modules are respectively arranged at different positions of the information transmission cable, and the arrangement positions of the regulating modules are respectively used as different regulating points; each of the regulatory modules comprises:
the monitoring unit is used for acquiring longitudinal induced electromotive force on a core wire at a corresponding regulation and control point of the information transmission cable to obtain a corresponding induced longitudinal potential monitoring value;
the tuning unit is connected with the monitoring unit and used for determining a tuning coefficient target value at a corresponding regulation point based on the induced longitudinal potential monitoring value;
and the shielding protection unit is respectively connected with the monitoring unit and the tuning unit and is used for adjusting the tuning coefficient at the corresponding regulation and control point of the information transmission cable according to the tuning coefficient target value so as to reduce the shielding coefficient of the information transmission cable to the shielding coefficient target value.
Optionally, the calculation formula of the tuning coefficient target value is:
wherein λ is0,iIs a tuning coefficient target value, V, at the ith regulation point1,iThe induced longitudinal potential monitoring value V at the ith regulation point2,iIs the voltage value to be eliminated at the ith regulation point, i is a positive integer from 1 to n, and n is regulationThe number of control points.
Optionally, the calculation formula of the voltage value to be eliminated is:
V2,i＝V1,i-V0,i；
V0,i＝γVi；
wherein, V2,iIs the voltage value V to be eliminated at the ith regulation point1,iThe induced longitudinal potential monitoring value V at the ith regulation point0,iA control target value of the induced longitudinal potential at the ith control point, gamma is a target value of the shielding coefficient of the information transmission cable, ViThe induced voltage of the core wire at the ith regulation point under the protection state of the unshielded layer is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
Optionally, each of the shielding protection units includes: a tap and tap control subunit;
the taps of the shielding protection units are respectively connected with the core wires and the shielding layers at the corresponding regulating and controlling points, and the taps are used for regulating the coil turn ratio of the core wires and the shielding layers at the regulating and controlling points of the information transmission cable; the shielding layer comprises an outer protective layer, a sheath and an armor layer which are wrapped outside the core wire of the information transmission cable;
and the tap control subunit is respectively connected with the monitoring unit, the tuning unit and the tap at the corresponding regulation and control point, and is used for adjusting the position of the tap according to the tuning coefficient target value so as to enable the current value of the tuning coefficient at each regulation and control point of the information transmission cable to be respectively equal to the corresponding tuning coefficient target value.
Optionally, the calculation formula of the current value of the tuning coefficient is:
wherein λ is1,iIs the current value of the tuning coefficient at the ith control point, n1,iNumber of turns of coil, n, connecting core wire at i-th regulation point2,iThe number of turns of the coil connected with the shielding layer at the ith regulation point is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a method and a system for shielding and protecting a rail transit information transmission cable, which comprises the steps of firstly, arranging at least one regulating and controlling point on the information transmission cable, and acquiring longitudinal induced electromotive force on a core wire at each regulating and controlling point of the information transmission cable to obtain a corresponding induced longitudinal potential monitoring value; then respectively determining the target value of the tuning coefficient at each regulation point based on each induced longitudinal potential monitoring value; and finally, respectively adjusting the tuning coefficients at the regulating and controlling points of the information transmission cable according to the target values of the tuning coefficients so as to reduce the shielding coefficients of the information transmission cable to the target values of the shielding coefficients. According to the invention, the tuning coefficient at each regulation and control point of the information transmission cable is flexibly adjusted according to the value of the longitudinal induced electromotive force monitored on the information transmission cable, so that the mutual inductance between the shielding layer and the core wire at each regulation and control point is improved, the induced electromotive force generated on the information transmission cable is reduced, and the shielding coefficient is effectively reduced, thereby achieving the set target value of the shielding coefficient and playing an effective shielding protection role on the information transmission cable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for shielding and protecting a track traffic information transmission cable according to the present invention;
fig. 2 is a cross-sectional structural view of an information transmission cable employed in the present invention;
fig. 3 is a block diagram of a shielding protection system for rail transit information transmission cables according to the present invention.
Description of the symbols: the cable comprises an outer protective layer-1, an armor layer-2, an inner lining layer-3, a sheath-4, an insulating layer-5, a core wire-6, an insulating single wire-7, a shielding layer-8, a regulation and control module-9, a monitoring unit-901, a tuning unit-902 and a shielding and protection unit-903.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method and a system for shielding and protecting a track traffic information transmission cable, which are used for reducing induced electromotive force generated on the information transmission cable and improving the shielding and protecting effect on a core wire of the information transmission cable.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The specific principle of the technical scheme provided by the invention is as follows:
step 1: the rail transit traction power supply and return system is equivalent to a section of conductor, and the conductor is called a disturbance source wire. The information transmission cable core wire laid close to the disturbance source wire (namely the rail transit traction power supply and return system) in parallel is called a disturbed wire. The shielding layer structure for wrapping the information transmission cable core wire comprises an outer protective layer, a sheath and an armor layer which are collectively called as a shielding layer.
Step 2: because mutual inductance (mutual inductance quantity is expressed by M) exists between the disturbance source lead and the disturbed lead, under the action of magnetic induction coupling, longitudinal induced electromotive force (expressed by V) is induced on the disturbed lead by the power frequency current on the disturbance source lead. Specifically, the longitudinal induced electromotive force per unit length of the disturbed wire is:
V＝jωMI1 (1)
wherein V is longitudinal induced electromotive force per unit length of the disturbed conductor under the protection state of no shielding layer, and M is the disturbance source conductor and the disturbed conductorMutual inductance between wires, I1To perturb the power frequency current on the source conductor, j is a complex unit representing the current lag voltage 90 ° and ω represents the angular frequency. Since the value of the induced electromotive force is related to the length of the wire, for ease of discussion, the subsequent longitudinal induced electromotive force represents the induced longitudinal potential per unit length.
And step 3: a third wire is introduced between a disturbance source wire and a disturbed wire by applying the magnetic induction principle, the third wire is called a shielding wire, the shielding wire is close to the disturbed wire and is laid in parallel with the disturbed wire, and meanwhile, two ends of the shielding wire are grounded. According to the law of electromagnetic induction, disturbing the power frequency current I on the source conductor1The current opposite to the direction of the shielding wire, i.e. the induced current on the shielding wire, is called I2The impedance of the shielded conductor is referred to as Z2Specifically, it is represented as:
wherein Z2For the impedance of the shielding wire, R is the direct current resistance of the shielding wire, L is the inductance of the shielding wire, G is the distributed conductance of the shielding wire, and C is the distributed capacitance of the shielding wire. At power frequency, the impedance Z of the shielded conductor2Approximately equal to the direct current resistance R of the shielded conductor2Thus, there are:
I2＝jωM1I1/R2 (2)
wherein, I2For shielding induced currents on the conductors, M1For disturbing mutual inductance between source and shield conductors, I1For disturbing the mains-frequency current on the source conductor, R2To shield the dc resistance of the wire.
And 4, step 4: according to the principle of electromagnetic induction, an electric current I is induced2A new longitudinal induced electromotive force is generated on the disturbed lead, the direction of the longitudinal induced electromotive force is opposite to that of the longitudinal induced electromotive force V generated on the disturbed lead by the disturbance source lead, so that the longitudinal induced electromotive force can be offset from the longitudinal induced electromotive force generated on the disturbed lead by the disturbance source lead, the core wire can be shielded and protected, and the longitudinal induced electromotive force is called VShieldingThen V isShieldingThe values of (A) are:
Vshielding＝jωM2I2 (3)
Wherein, VShieldingFor inducing a longitudinal induced electromotive force generated on the disturbed conductor, M2For mutual inductance between the shield conductor and the disturbed conductor, I2To shield the induced current on the wire.
And 5: bringing formula (2) into formula (3) to obtain VShielding＝(jωM2*jωMI1)/R2Thus, it is possible to obtain a residual longitudinal induced electromotive force on the core wire of the information transmission cable (i.e., an actual monitored value of the induced longitudinal potential on the core wire) as:
Vremainder of＝V-VShielding＝jωMI1(1-(jωM2/R2) In the formula, VRemainder ofRepresenting the actual monitored value of the induced longitudinal potential on the core wire, the mutual inductance M between the shielded conductor and the disturbed conductor2Is in negative correlation, M2The larger, the VRemainder ofThe smaller the shielding coefficient, the better the shielding effect. It follows that the mutual inductance M between the shield conductor and the victim conductor2The larger the shielding effect, the better.
Therefore, the method and the system for shielding and protecting the rail transit information transmission cable provided by the invention take the shielding layer of the information transmission cable as a third conductor, namely a shielding lead, and achieve the purposes of reducing the shielding coefficient of the information transmission cable and inhibiting the generation of overhigh longitudinal induced electromotive force on the disturbed lead by increasing the mutual inductance between the shielding layer and the disturbed lead (core wire). The specific implementation mode is as follows:
example 1
The invention provides a method for shielding and protecting a track traffic information transmission cable, and fig. 1 is a schematic flow chart of the method for shielding and protecting the track traffic information transmission cable, as shown in fig. 1, the method comprises the following steps:
step S1: at least one regulating and controlling point is arranged on the information transmission cable, and longitudinal induced electromotive force on a core wire at each regulating and controlling point of the information transmission cable is obtained to obtain a corresponding induced longitudinal potential monitoring value.
Step S2: and respectively determining the target value of the tuning coefficient at each regulating and controlling point based on each induced longitudinal potential monitoring value.
Step S3: and respectively adjusting the tuning coefficients at the regulating and controlling points of the information transmission cable according to the target tuning coefficient values so as to reduce the shielding coefficient of the information transmission cable to the target shielding coefficient value.
The above steps are discussed in detail below:
in step S2, the calculation formula for determining the tuning coefficient target value at each control point is:
wherein λ is0,iIs a tuning coefficient target value, V, at the ith regulation point1,iThe induced longitudinal potential monitoring value V at the ith regulation point2,iAnd the voltage value to be eliminated at the ith regulation point is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
Further, the calculation formula of the voltage value to be eliminated is as follows:
V2,i＝V1,i-V0,i；
V0,i＝γVi；
wherein, V2,iIs the voltage value V to be eliminated at the ith regulation point1,iThe induced longitudinal potential monitoring value V at the ith regulation point0,iA control target value of the induced longitudinal potential at the ith control point, gamma is a target value of the shielding coefficient of the information transmission cable, ViThe induced voltage of the core wire at the ith regulation point under the protection state of the unshielded layer is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
In step S3, the adjusting the tuning coefficients at the control points of the information transmission cable according to the target tuning coefficient values respectively specifically includes:
respectively adjusting the turn ratio of coils of the connecting core wire and the shielding layer at each control point of the information transmission cable until the current value of the tuning coefficient at each control point of the information transmission cable is respectively equal to the corresponding target value of the tuning coefficient; the shielding layer comprises an outer protection layer, a sheath and an armor layer which are wrapped outside the core wire of the information transmission cable.
Further, the calculation formula of the current value of the tuning coefficient is as follows:
wherein λ is1,iIs the current value of the tuning coefficient at the ith regulation point, n1,iNumber of turns of coil, n, connecting core wire at i-th regulation point2,iThe number of turns of the coil connected with the shielding layer at the ith regulation point is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
Example 2
Fig. 2 is a cross-sectional structural view of an information transmission cable (e.g., a railway digital signal cable) employed in the present invention, as shown in fig. 2, the information transmission cable including: the cable comprises an outer protective layer 1, an armor layer 2, an inner liner layer 3, a sheath 4, an insulating layer 5, a core wire 6 and an insulating single wire 7. Wherein, the outer protective layer 1 is positioned on the outermost layer and is made of PE material, and the diameter is 17.6 mm; the armor layer 2 is positioned on the inner layer of the outer protective layer 1, is specifically a steel tape armor and has the thickness of 0.2 mm; the inner liner layer 3 is positioned in the inner layer of the armor layer 2, is made of PE and has the diameter of 13.3 mm; the sheath 4 is positioned on the inner layer of the lining layer 3, and is specifically an aluminum sheath; the core wires 6 are multiple, each core wire is a copper core wire with the diameter of 1.53mm, the multiple core wires 6 are divided into four groups, and the core wires 6 of each group are wound into a columnar structure in a crossed manner and are positioned on the innermost layer of the information transmission cable together; the outer layer of each columnar structure is wrapped with an insulating layer 5, and the insulating layer 5 is made of PE and has the diameter of 3.5 mm; the insulated single wire 7 is specifically a copper insulated single wire with the diameter of 0.8mm, and is positioned between the insulating layer 5 and the sheath 4. The outer sheath 1, the armor layer 2 and the sheath 4 together form the shielding layer 8.
The invention also provides a shielding protection system for a rail transit information transmission cable, fig. 3 is a block diagram of the shielding protection system for a rail transit information transmission cable provided by the invention, as shown in fig. 3, the system comprises: at least one regulatory module 9; the regulating modules 9 are respectively arranged at different positions of the information transmission cable, and the arrangement positions of the regulating modules 9 are respectively used as different regulating points; each of the regulatory modules 9 comprises: a monitoring unit 901, a tuning unit 902 and a shielding protection unit 903.
Specifically, the monitoring unit 901 is configured to obtain a longitudinal induced electromotive force on the core wire 6 at a corresponding control point of the information transmission cable, so as to obtain a corresponding induced longitudinal potential monitoring value; the tuning unit 902 is connected to the monitoring unit 901, and is configured to determine a tuning coefficient target value at a corresponding regulation point based on the induced longitudinal potential monitoring value; the shielding protection unit 903 is connected to the monitoring unit 901 and the tuning unit 902, and is configured to adjust a tuning coefficient at a corresponding control point of the information transmission cable according to the tuning coefficient target value, so that the shielding coefficient of the information transmission cable is reduced to the shielding coefficient target value.
As a specific implementation manner, each of the control modules 9 is serially connected to the information transmission cable, and is disposed at two ends, a middle section, or an even section of the cable laying area according to the degree of the line being affected by the induction.
Specifically, the calculation formula of the tuning coefficient target value is as follows:
wherein λ is0,iIs a tuning coefficient target value, V, at the ith regulation point1,iThe induced longitudinal potential monitoring value V at the ith regulation point2,iAnd the voltage value to be eliminated at the ith regulation point is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
Further, the calculation formula of the voltage value to be eliminated is as follows:
V2,i＝V1,i-V0,i；
V0,i＝γVi；
wherein, V2,iIs the voltage value V to be eliminated at the ith regulation point1,iThe induced longitudinal potential monitoring value V at the ith regulation point0,iA control target value of the induced longitudinal potential at the ith control point, gamma is a target value of the shielding coefficient of the information transmission cable, ViAnd the induction voltage of the core wire at the ith regulation point under the protection state of the unshielded layer, wherein i is a positive integer from 1 to n, and n is the number of the regulation points.
Preferably, each of the shielding protection units 903 includes: a tap and a tap control subunit. The taps of the shielding protection units 903 are respectively connected with the core wires 6 and the shielding layers 8 at the corresponding control points, and the taps are used for adjusting the coil turn ratio of the core wires 6 and the shielding layers 8 at the control points of the information transmission cable; the shielding layer 8 comprises an outer protective layer 1, a sheath 4 and an armor layer 2 which are wrapped outside the information transmission cable core 6. The tap control subunit is connected to the monitoring unit 901, the tuning unit 902 and the tap at the corresponding control point, respectively, and is configured to adjust the position of the tap according to the tuning coefficient target value, so that the current value of the tuning coefficient at each control point of the information transmission cable is equal to the corresponding tuning coefficient target value, respectively.
Further, each tuning unit 902 includes: the device comprises a primary coil, a secondary coil, an iron core and a tuning coefficient calculation subunit. The core wires 6 at each control point respectively form a primary coil corresponding to the tuning unit 902, the shielding layers 8 at each control point respectively form a secondary coil corresponding to the tuning unit 902, and the primary coil and the secondary coil are respectively wound on an iron core corresponding to the tuning unit 902; the taps of the shield protection units 903 are connected to the primary coil and the secondary coil of the corresponding tuner unit 902, respectively. The tuning coefficient calculation subunit is respectively connected to the monitoring unit 901 and the tap control subunit at the corresponding control point, and is configured to determine a tuning coefficient target value at the corresponding control point based on the induced longitudinal potential monitoring value, and send the tuning coefficient target value to the corresponding tap control subunit.
Specifically, the calculation formula of the current value of the tuning coefficient is as follows:
wherein λ is1,iIs the current value of the tuning coefficient at the ith regulation point, n1,iNumber of turns of coil, n, connecting core wire at i-th regulation point2,iThe number of turns of the coil connected with the shielding layer at the ith regulation point is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
In the prior art, due to the effect of electromagnetic coupling, a contact wire and a return wire system (i.e. a disturbance source wire) of a rail transit traction power supply system can generate an induced longitudinal potential on an information transmission cable core wire (i.e. a disturbed wire) which is close to the contact wire and the return wire system in parallel, and the induced longitudinal potential can interfere with information transmission, so that the problems of system information mistransmission, missed transmission and the like can be caused.
The method and the system for shielding and protecting the track traffic information transmission cable increase the induction effect of the shielding wire on the disturbed wire by improving the mutual inductance between the shielding wire (namely, the shielding layer wrapped outside the core wire) and the disturbed wire (namely, the core wire), thereby achieving the purpose of reducing the overhigh induction longitudinal potential generated on the core wire of the information transmission cable. The method can inhibit the influence of interference and danger generated when the information transmission cable is subjected to the electromagnetic induction of the traction power supply system, and can effectively reduce the longitudinal induced electromotive force and the static induced voltage generated by induction on the information transmission cable. By carrying out indoor test and field actual test on the rail transit information transmission cable shielding protection system provided by the invention, the shielding effect can reach 0.1, and the shielding protection system can play an effective shielding protection role on the information transmission cable core wire.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A method for shielding and protecting a rail transit information transmission cable is characterized by comprising the following steps:
arranging at least one regulating and controlling point on the information transmission cable, and acquiring longitudinal induced electromotive force on a core wire at each regulating and controlling point of the information transmission cable to obtain a corresponding induced longitudinal potential monitoring value;
respectively determining the target value of the tuning coefficient at each regulation and control point based on each induced longitudinal potential monitoring value;
and respectively adjusting the tuning coefficients at the regulating and controlling points of the information transmission cable according to the target tuning coefficient values so as to reduce the shielding coefficient of the information transmission cable to the target shielding coefficient value.
2. The method for shielding and protecting the rail transit information transmission cable according to claim 1, wherein the target tuning coefficient value is calculated by the formula:
wherein λ is0,iIs a tuning coefficient target value, V, at the ith regulation point1,iThe induced longitudinal potential monitoring value V at the ith regulation point2,iAnd the voltage value to be eliminated at the ith regulation point is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
3. The method for shielding and protecting the rail transit information transmission cable according to claim 2, wherein the voltage value to be eliminated is calculated by the formula:
V2,i＝V1,i-V0,i；
V0,i＝γVi；
wherein, V2,iIs the voltage value V to be eliminated at the ith regulation point1,iThe induced longitudinal potential monitoring value V at the ith regulation point0,iA control target value of the induced longitudinal potential at the ith control point, gamma is a target value of the shielding coefficient of the information transmission cable, ViThe induced voltage of the core wire at the ith regulation point under the protection state of the unshielded layer is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
4. The method for shielding and protecting a track traffic information transmission cable according to claim 1, wherein the adjusting the tuning coefficients at the control points of the information transmission cable according to the target values of the tuning coefficients respectively comprises:
respectively adjusting the turn ratio of coils of the connecting core wire and the shielding layer at each control point of the information transmission cable until the current value of the tuning coefficient at each control point of the information transmission cable is respectively equal to the corresponding target value of the tuning coefficient; the shielding layer comprises an outer protective layer, a sheath and an armor layer which are wrapped outside the core wire of the information transmission cable.
5. The method for shielding and protecting the track traffic information transmission cable according to claim 4, wherein the calculation formula of the current value of the tuning coefficient is as follows:
wherein λ is1,iIs the current value of the tuning coefficient at the ith regulation point, n1,iNumber of turns of coil, n, connecting core wire at i-th regulation point2,iThe number of turns of the coil connected with the shielding layer at the ith regulation point is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
6. A rail transit information transmission cable shielding protection system, the system comprising: at least one regulatory module; the regulating modules are respectively arranged at different positions of the information transmission cable, and the arrangement positions of the regulating modules are respectively used as different regulating points; each of the regulatory modules comprises:
the monitoring unit is used for acquiring longitudinal induced electromotive force on a core wire at a corresponding regulation and control point of the information transmission cable to obtain a corresponding induced longitudinal potential monitoring value;
the tuning unit is connected with the monitoring unit and used for determining a tuning coefficient target value at a corresponding regulation point based on the induced longitudinal potential monitoring value;
and the shielding protection unit is respectively connected with the monitoring unit and the tuning unit and is used for adjusting the tuning coefficient at the corresponding regulation and control point of the information transmission cable according to the tuning coefficient target value so as to reduce the shielding coefficient of the information transmission cable to the shielding coefficient target value.
7. The rail transit information transmission cable shielding protection system of claim 6, wherein the target tuning coefficient value is calculated by the formula:
wherein λ is0,iIs a tuning coefficient target value, V, at the ith control point1,iThe induced longitudinal potential monitoring value V at the ith regulation point2,iAnd the voltage value to be eliminated at the ith regulation point is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
8. The rail transit information transmission cable shielding protection system of claim 7, wherein the voltage value to be eliminated is calculated by the formula:
V2,i＝V1,i-V0,i；
V0,i＝γVi；
wherein, V2,iIs the treatment at the ith regulation pointEliminating the voltage value, V1,iThe induced longitudinal potential monitoring value V at the ith regulation point0,iA control target value of the induced longitudinal potential at the ith control point, gamma is a target value of the shielding coefficient of the information transmission cable, ViThe induced voltage of the core wire at the ith regulation point under the protection state of the unshielded layer is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
9. The rail transit information transmission cable shielding protection system of claim 6, wherein each of the shielding protection units comprises: a tap and tap control subunit;
the taps of the shielding protection units are respectively connected with the core wires and the shielding layers at the corresponding regulating and controlling points, and the taps are used for regulating the coil turn ratio of the core wires and the shielding layers at the regulating and controlling points of the information transmission cable; the shielding layer comprises an outer protective layer, a sheath and an armor layer which are wrapped outside the core wire of the information transmission cable;
and the tap control subunit is respectively connected with the monitoring unit, the tuning unit and the tap at the corresponding regulation and control point, and is used for adjusting the position of the tap according to the tuning coefficient target value so as to enable the current value of the tuning coefficient at each regulation and control point of the information transmission cable to be respectively equal to the corresponding tuning coefficient target value.
10. The rail transit information transmission cable shielding protection system of claim 9, wherein the current value of the tuning coefficient is calculated by the formula:
wherein λ is1,iIs the current value of the tuning coefficient at the ith regulation point, n1,iNumber of turns of coil, n, connecting core wire at i-th regulation point2,iThe number of turns of the coil connected with the shielding layer at the ith regulation point is shown, i is a positive integer from 1 to n, and n is the number of the regulation points.
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| CN202210317974.7A CN114709025B (en) | 2022-03-29 | 2022-03-29 | Rail transit information transmission cable shielding protection method and system |
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| CN202210317974.7A CN114709025B (en) | 2022-03-29 | 2022-03-29 | Rail transit information transmission cable shielding protection method and system |
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| CN114709025B (en) | 2024-03-22 |
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