CN114709025B - 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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- CN114709025B CN114709025B CN202210317974.7A CN202210317974A CN114709025B CN 114709025 B CN114709025 B CN 114709025B CN 202210317974 A CN202210317974 A CN 202210317974A CN 114709025 B CN114709025 B CN 114709025B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000033228 biological regulation Effects 0.000 claims abstract description 78
- 238000012544 monitoring process Methods 0.000 claims abstract description 43
- 230000001105 regulatory effect Effects 0.000 claims abstract description 25
- 239000010410 layer Substances 0.000 claims description 83
- 239000011241 protective layer Substances 0.000 claims description 17
- 230000006698 induction Effects 0.000 claims description 10
- 230000002829 reductive effect Effects 0.000 abstract description 5
- 230000001276 controlling effect Effects 0.000 abstract description 2
- 239000004020 conductor Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
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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
- 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
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
- H01B11/10—Screens specially adapted for reducing interference from external sources
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Abstract
The invention discloses a shielding protection method and system for a track traffic information transmission cable, and belongs to the technical field of track traffic information transmission. Firstly, at least one regulation point is arranged on an information transmission cable, and the monitoring value of the induced longitudinal potential on a core wire at each regulation point of the information transmission cable is obtained; then, respectively determining tuning coefficient target values at all regulating and controlling points based on all the induced longitudinal potential monitoring values; and finally, respectively adjusting the tuning coefficients at each control point of the information transmission cable according to the tuning coefficient target values. According to the invention, the tuning coefficients of the information transmission cable at each regulation point are 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 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 information transmission cable is effectively shielded and protected.
Description
Technical Field
The invention relates to the technical field of rail transit information transmission, in particular to a shielding protection method and system for 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 an information transmission cable laid along the line. Especially when the power supply mode is a direct power supply mode, the induced longitudinal potential hazard generated on the information transmission cable laid along the line is larger, the actual measurement maximum value of the induced longitudinal potential can reach 200 volts or more, the allowable standard of 60 volts is far exceeded, the personal safety and the equipment safety are endangered, the personal safety of system maintenance personnel is endangered, and the normal operation and the service life of the cable are seriously influenced. Accordingly, it is desirable to provide a method and system for shielding a track traffic information transmission cable to reduce the induced longitudinal potential on the information transmission cable by the track traffic traction power supply system.
Disclosure of Invention
The invention aims to provide a shielding protection method and system for a track traffic information transmission cable, which are used for reducing the induced electromotive force generated on the information transmission cable and improving the shielding protection effect on a core wire of the information transmission cable.
In order to achieve the above object, the present invention provides the following solutions:
a method of shielding protection for a rail transit information transmission cable, the method comprising:
at least one regulating point is arranged on the information transmission cable, and the longitudinal induced electromotive force on the core wire at each regulating point of the information transmission cable is obtained to obtain a corresponding induced longitudinal potential monitoring value;
determining tuning coefficient target values at all control points based on all the induced longitudinal potential monitoring values respectively;
and respectively adjusting tuning coefficients at each control point of the information transmission cable according to each 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 lambda is 0,i For the tuning coefficient target value at the ith tuning point,V 1,i is the monitoring value of the induced longitudinal potential at the ith control point, V 2,i And i is a positive integer from 1 to n, and n is the number of the regulating points.
Optionally, the calculation formula of the voltage value to be eliminated is:
V 2,i ＝V 1,i -V 0,i ；
V 0,i ＝γV i ；
wherein V is 2,i To-be-eliminated voltage value at the ith regulation point, V 1,i Is the monitoring value of the induced longitudinal potential at the ith control point, V 0,i Is the induced longitudinal potential regulation target value at the ith regulation point, gamma is the shielding coefficient target value of the information transmission cable, V i The induction voltage of the core wire at the ith regulation point under the shielding layer-free protection state is i being a positive integer from 1 to n, and n being the number of the regulation points.
Optionally, the adjusting the tuning coefficients at each control point of the information transmission cable according to each tuning coefficient target value includes:
respectively adjusting the coil turn ratio of the connecting core wire and the shielding layer at each control point of the information transmission cable until the current tuning coefficient value at each control point of the information transmission cable is respectively equal to the corresponding tuning coefficient target value; 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 tuning coefficient current value is:
wherein lambda is 1,i For the current value of the tuning coefficient at the ith control point, n 1,i For the number of turns of the coil connected with the core wire at the ith control point, n 2,i The number of turns of the coil connected with the shielding layer at the ith regulating point is i, which is a positive integer from 1 to n, and n is the number of regulating points.
The invention also provides a track traffic information transmission cable shielding protection system, which comprises: at least one regulation module; each regulation and control module is respectively arranged at different positions of the information transmission cable, and the arrangement positions of the regulation and control modules are respectively used as different regulation and control points; each regulation and control module comprises:
the monitoring unit is used for acquiring longitudinal induced electromotive force on the core wire at the corresponding regulation 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 is used for determining a tuning coefficient target value at a corresponding regulation and control 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 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 lambda is 0,i For tuning coefficient target value at the ith regulation point, V 1,i Is the monitoring value of the induced longitudinal potential at the ith control point, V 2,i And i is a positive integer from 1 to n, and n is the number of the regulating points.
Optionally, the calculation formula of the voltage value to be eliminated is:
V 2,i ＝V 1,i -V 0,i ；
V 0,i ＝γV i ；
wherein V is 2,i To-be-eliminated voltage value at the ith regulation point, V 1,i Is the monitoring value of the induced longitudinal potential at the ith control point, V 0,i Is the induced longitudinal potential regulation target value at the ith regulation point, gamma is the shielding coefficient target value of the information transmission cable, V i Is the induction voltage of the core wire at the ith regulating point under the protection state of the shielding layer, i is positive from 1 to nAnd n is the number of the control 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 control points, and the taps are used for adjusting the coil turn ratio of the core wires and the shielding layers at the control 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;
the tap control subunit is respectively connected with the monitoring unit, the tuning unit and the tap at the corresponding regulation points 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 point of the information transmission cable to be respectively equal to the corresponding tuning coefficient target value.
Optionally, the calculation formula of the tuning coefficient current value is:
wherein lambda is 1,i For the current value of the tuning coefficient at the ith control point, n 1,i For the number of turns of the coil connected with the core wire at the ith control point, n 2,i The number of turns of the coil connected with the shielding layer at the ith regulating point is i, which is a positive integer from 1 to n, and n is the number of regulating points.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a shielding protection method and a system for a track traffic information transmission cable, wherein at least one regulation point is arranged on the information transmission cable, and longitudinal induced electromotive force on a core wire at each regulation point of the information transmission cable is obtained to obtain a corresponding induced longitudinal potential monitoring value; then, respectively determining tuning coefficient target values at all the regulating and controlling points based on all the induced longitudinal potential monitoring values; and finally, respectively adjusting tuning coefficients at each control point of the information transmission cable according to each tuning coefficient target value so as to reduce the shielding coefficient of the information transmission cable to the shielding coefficient target value. According to the invention, the tuning coefficients of the information transmission cable at each regulation point are 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 point is improved, the induced electromotive force generated on the information transmission cable is reduced, and the shielding coefficient is effectively reduced, thereby reaching 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 of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a shielding protection method for a track traffic information transmission cable provided by the 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 track traffic information transmission cable shielding protection system according to the present invention.
Symbol description: the cable comprises an outer protective layer-1, an armor layer-2, an inner liner-3, a sheath-4, an insulating layer-5, a core wire-6, an insulating single wire-7, a shielding layer-8, a regulating module-9, a monitoring unit-901, a tuning unit-902 and a shielding protection unit-903.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a shielding protection method and system for a track traffic information transmission cable, which are used for reducing the induced electromotive force generated on the information transmission cable and improving the shielding protection effect on a core wire of the information transmission cable.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The specific principle of the technical scheme provided by the invention is as follows:
step 1: the rail transit traction power supply and the reflux system are equivalent to a section of conductor, and the conductor is called a harassment source wire. The information transmission cable core wire which is parallel to the harassment source wire (namely the rail transit traction power supply and reflux system) and is closely laid is called a harassment 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 shielding layers.
Step 2: because mutual inductance (the mutual inductance is represented by M) exists between the harassment source wire and the disturbed wire, the power frequency current on the harassment source wire induces longitudinal induced electromotive force (represented by V) on the disturbed wire under the action of magnetic induction coupling. Specifically, the longitudinal induced electromotive force per unit length of the disturbed wire is:
V＝jωMI 1 (1)
wherein V is longitudinal induced electromotive force of a disturbed wire per unit length under the protection state of an unshielded layer, M is mutual inductance between a disturbance source wire and the disturbed wire, I 1 For the power frequency current on the harassment source lead, j is a complex unit, the current hysteresis voltage is 90 degrees, and ω represents the angular frequency. Since the value of the induced electromotive force is related to the length of the wire, the subsequent longitudinal induced electromotive forces each represent an induced longitudinal potential per unit length for convenience of discussion.
Step 3: and a third wire is introduced between the harassment source wire and the harassment wire by using the magnetic induction principle, the third wire is called a shielding wire, the shielding wire is close to the harassment wire and is laid in parallel with the harassment wire, and two ends of the shielding wire are grounded. According to the law of electromagnetic induction, the power frequency current I on a harassment source wire 1 Will be generated on the shielding wireTo opposite currents, i.e. induced currents on the shielded conductors, called I 2 The impedance of the shielded conductor is referred to as Z 2 The method is specifically expressed as follows:wherein Z is 2 For 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. In the case of power frequency, the impedance Z of the shielded conductor 2 About equal to the DC resistance R of the shielded conductor 2 Thus, there are:
I 2 ＝jωM 1 I 1 /R 2 (2)
wherein I is 2 To shield the induced current on the wire, M 1 To disturb the mutual inductance between the source wire and the shielding wire, I 1 R is the power frequency current on the harassment source wire 2 To shield the direct current resistance of the wire.
Step 4: according to the principle of electromagnetic induction, an induced current I 2 A new longitudinal induced electromotive force is generated on the disturbed wire, which is opposite to the longitudinal induced electromotive force V generated on the disturbed wire by the harassment source wire, thus being capable of counteracting the longitudinal induced electromotive force generated on the disturbed wire by the harassment source wire, and playing a role of shielding and protecting the core wire, which is called V Shielding V is then Shielding The values of (2) are:
V shielding ＝jωM 2 I 2 (3)
Wherein V is Shielding To induce a longitudinal induced electromotive force, M, on the disturbed conductor by an induced current 2 To shield the mutual inductance between the conductor and the disturbed conductor, I 2 To shield the induced current on the wire.
Step 5: bringing formula (2) into formula (3) to obtain V Shielding ＝(jωM 2 *jωMI 1 )/R 2 Thus, the remaining longitudinal induced electromotive force on the core of the information transmission cable (i.e., the actual monitored value of the induced longitudinal potential on the core) can be obtained as follows:
V residual of ＝V-V Shielding ＝jωMI 1 (1-(jωM 2 /R 2 ) In the formula V Residual of Representing the actual monitored value of the induced longitudinal potential on the core wire, which is related to the mutual inductance M between the shielded conductor and the disturbed conductor 2 Is inversely related to M 2 The larger the V Residual of The smaller the shielding coefficient is, the smaller the shielding effect is. It follows that the mutual inductance M between the shielded and disturbed conductors 2 The larger the shielding effect is, the better.
Therefore, the shielding protection method and system for the track traffic information transmission cable provided by the invention take the shielding layer of the information transmission cable as a third conductor, namely a shielding wire, and achieve the purposes of reducing the shielding coefficient of the information transmission cable and inhibiting the generation of excessive longitudinal induced electromotive force on the interfered wire by increasing the mutual inductance between the shielding layer and the interfered wire (core wire). The specific implementation mode is as follows:
example 1
The invention provides a shielding protection method for a track traffic information transmission cable, and fig. 1 is a schematic flow diagram of the shielding protection method for the track traffic information transmission cable, as shown in fig. 1, the method comprises the following steps:
step S1: and arranging at least one regulation and control point on the information transmission cable, and obtaining longitudinal induced electromotive force on a core wire at each regulation and control point of the information transmission cable to obtain a corresponding induced longitudinal potential monitoring value.
Step S2: and respectively determining tuning coefficient target values at each regulation point based on each induced longitudinal potential monitoring value.
Step S3: and respectively adjusting tuning coefficients at each control point of the information transmission cable according to each tuning coefficient target value so as to reduce the shielding coefficient of the information transmission cable to the shielding coefficient target value.
The steps described above are discussed in detail below:
in step S2, a calculation formula for determining the tuning coefficient target value at each regulation point is:
wherein lambda is 0,i For tuning coefficient target value at the ith regulation point, V 1,i Is the monitoring value of the induced longitudinal potential at the ith control point, V 2,i And i is a positive integer from 1 to n, and n is the number of the regulating points.
Further, the calculation formula of the voltage value to be eliminated is as follows:
V 2,i ＝V 1,i -V 0,i ；
V 0,i ＝γV i ；
wherein V is 2,i To-be-eliminated voltage value at the ith regulation point, V 1,i Is the monitoring value of the induced longitudinal potential at the ith control point, V 0,i Is the induced longitudinal potential regulation target value at the ith regulation point, gamma is the shielding coefficient target value of the information transmission cable, V i The induction voltage of the core wire at the ith regulation point under the shielding layer-free protection state is i being a positive integer from 1 to n, and n being the number of the regulation points.
In step S3, the tuning coefficients at each regulation point of the information transmission cable are respectively adjusted according to each tuning coefficient target value, which specifically includes:
respectively adjusting the coil turn ratio of the connecting core wire and the shielding layer at each control point of the information transmission cable until the current tuning coefficient value at each control point of the information transmission cable is respectively equal to the corresponding tuning coefficient target value; 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.
Further, the calculation formula of the tuning coefficient current value is as follows:
wherein lambda is 1,i For the current value of the tuning coefficient at the ith control point, n 1,i For the number of turns of the coil connected with the core wire at the ith control point, n 2,i I is the number of turns of the coil connected with the shielding layer at the ith control pointN is the number of control points and is a positive integer from 1 to n.
Example 2
Fig. 2 is a cross-sectional structural view of an information transmission cable (e.g., railway digital signal cable) used in the present invention, and as shown in fig. 2, the information transmission cable includes: the cable comprises an outer protective layer 1, an armor layer 2, an inner liner 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 at the outermost layer and is made of PE material, and the diameter of the outer protective layer is 17.6mm; the armor layer 2 is positioned on the inner layer of the outer protective layer 1, specifically steel tape armor, and the thickness is 0.2mm; the lining layer 3 is positioned at the inner layer of the armor layer 2 and is made of PE material, and the diameter of the lining layer is 13.3mm; the sheath 4 is positioned at the inner layer of the inner liner 3, in particular to an aluminum sheath; the plurality of core wires 6 are copper core wires with the diameter of 1.53mm, the plurality of core wires 6 are divided into four groups, and the core wires 6 of each group are intertwined into a strand of columnar structure and are positioned at the innermost layer of the information transmission cable together; the outer layers of the columnar structures are wrapped with an insulating layer 5, the insulating layer 5 is made of PE, and the diameter of the insulating layer is 3.5mm; the insulating element wire 7 is specifically a copper insulating element wire with a diameter of 0.8mm, and is located between the insulating layer 5 and the sheath 4. The outer sheath 1, the armor layer 2 and the sheath 4 together form a shielding layer 8 according to the invention.
The invention also provides a track traffic information transmission cable shielding protection system, fig. 3 is a block diagram of the track traffic information transmission cable shielding protection system provided by the invention, as shown in fig. 3, the system comprises: at least one regulation module 9; each regulation and control module 9 is respectively arranged at different positions of the information transmission cable, and the arrangement positions of the regulation and control modules 9 are respectively used as different regulation and control points; each of the regulation modules 9 includes: 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 regulation point of the information transmission cable, so as to obtain a corresponding induced longitudinal potential monitoring value; the tuning unit 902 is connected with the monitoring unit 901 and is used for determining 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 adjusting 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 regulation and control module 9 is connected in series in the information transmission cable, and is arranged at two ends, the middle section or the equal section positions of the cable laying section according to the induction influence degree of the line.
Specifically, the calculation formula of the tuning coefficient target value is:
wherein lambda is 0,i For tuning coefficient target value at the ith regulation point, V 1,i Is the monitoring value of the induced longitudinal potential at the ith control point, V 2,i And i is a positive integer from 1 to n, and n is the number of the regulating points.
Further, the calculation formula of the voltage value to be eliminated is as follows:
V 2,i ＝V 1,i -V 0,i ；
V 0,i ＝γV i ；
wherein V is 2,i To-be-eliminated voltage value at the ith regulation point, V 1,i Is the monitoring value of the induced longitudinal potential at the ith control point, V 0,i Is the induced longitudinal potential regulation target value at the ith regulation point, gamma is the shielding coefficient target value of the information transmission cable, V i The induction voltage of the core wire at the ith regulation point under the shielding layer-free protection state is i being a positive integer from 1 to n, and n being 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 each shielding protection unit 903 are respectively connected with the core wire 6 and the shielding layer 8 at the corresponding regulation points, and the taps are used for adjusting the coil turn ratio of the core wire 6 and the shielding layer 8 at each regulation point 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 wire 6. The tap control subunit is respectively connected with the monitoring unit 901, the tuning unit 902 and the tap at the corresponding control points, and is used for adjusting 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 respectively equal to the corresponding tuning coefficient target value.
Further, each tuning unit 902 includes: primary coil, secondary coil, iron core and tuning coefficient calculating subunit. Wherein, the core wires 6 at each control point respectively form a primary coil of the corresponding tuning unit 902, the shielding layers 8 at each control point respectively form a secondary coil of the corresponding tuning unit 902, and the primary coil and the secondary coil are respectively wound on the iron cores of the corresponding tuning units 902; taps of the shielding protection units 903 are connected to the primary coil and the secondary coil of the corresponding tuning unit 902, respectively. The tuning coefficient calculating subunit is respectively connected with the monitoring unit 901 and the tap control subunit at the corresponding regulation point, and is configured to determine a tuning coefficient target value at the corresponding regulation 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 tuning coefficient current value is:
wherein lambda is 1,i For the current value of the tuning coefficient at the ith control point, n 1,i For the number of turns of the coil connected with the core wire at the ith control point, n 2,i The number of turns of the coil connected with the shielding layer at the ith regulating point is i, which is a positive integer from 1 to n, and n is the number of regulating points.
In the prior art, due to the electromagnetic coupling effect, a contact wire and a return wire system (namely a harassment source wire) of a rail transit traction power supply system can generate induced longitudinal potential on an information transmission cable core wire (namely a harassment wire) which is close to the contact wire in parallel, and the induced longitudinal potential can cause interference to information transmission and can cause the problems of mistransmission, missed transmission and the like of system information.
The method and the system for shielding and protecting the track traffic information transmission cable provided by the invention can achieve the purpose of reducing the excessively high induced longitudinal potential generated on the core wire of the information transmission cable by increasing the induction of the shielded wire to the interfered wire through increasing the mutual inductance between the shielded wire (namely the shielding layer wrapped outside the core wire) and the interfered wire (namely the core wire). The method can inhibit the influence of interference and danger generated when the information transmission cable is subjected to electromagnetic induction of the traction power supply system, and can effectively reduce longitudinal induced electromotive force and electrostatic induced voltage induced on the information transmission cable. Through indoor test and field actual test on the track traffic information transmission cable shielding protection system provided by the invention, the shielding effect can reach 0.1, and the effective shielding protection effect can be achieved on the information transmission cable core wire.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the core concept of the invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (8)
1. A method for shielding and protecting a track traffic information transmission cable, the method comprising:
at least one regulating point is arranged on the information transmission cable, and the longitudinal induced electromotive force on the core wire at each regulating point of the information transmission cable is obtained to obtain a corresponding induced longitudinal potential monitoring value;
determining tuning coefficient target values at all control points based on all the induced longitudinal potential monitoring values respectively;
respectively adjusting tuning coefficients at each control point of the information transmission cable according to each tuning coefficient target value so as to reduce the shielding coefficient of the information transmission cable to the shielding coefficient target value;
the information transmission cable includes: the cable comprises an outer protective layer, an armor layer, an inner liner layer, a sheath, an insulating layer, a core wire and an insulating single wire; the outer protective layer is positioned on the outermost layer; the armor layer is positioned on the inner layer of the outer protective layer; the inner lining layer is positioned on the inner layer of the armor layer; the sheath is positioned on the inner layer of the inner liner; the plurality of core wires are divided into four groups, and the core wires of each group are intertwined into a columnar structure and are positioned at the innermost layer of the information transmission cable together; the outer layer of each columnar structure is wrapped with an insulating layer; the insulating single wire is positioned between the insulating layer and the sheath;
tuning coefficients at each control point of the information transmission cable are respectively adjusted according to each tuning coefficient target value, and the method specifically comprises the following steps:
respectively adjusting the coil turn ratio of the connecting core wire and the shielding layer at each control point of the information transmission cable until the current tuning coefficient value at each control point of the information transmission cable is respectively equal to the corresponding tuning coefficient target value; 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.
2. The method for shielding protection of a track traffic information transmission cable according to claim 1, wherein the calculation formula of the tuning coefficient target value is:
wherein lambda is 0,i For tuning coefficient target value at the ith regulation point, V 1,i At the ith regulatory pointIs a sensed longitudinal potential monitor value of V 2,i And i is a positive integer from 1 to n, and n is the number of the regulating points.
3. The method for shielding and protecting a track traffic information transmission cable according to claim 2, wherein the calculation formula of the voltage value to be eliminated is:
V 2,i ＝V 1,i -V 0,i ；
V 0,i ＝γV i ；
wherein V is 2,i To-be-eliminated voltage value at the ith regulation point, V 1,i Is the monitoring value of the induced longitudinal potential at the ith control point, V 0,i Is the induced longitudinal potential regulation target value at the ith regulation point, gamma is the shielding coefficient target value of the information transmission cable, V i The induction voltage of the core wire at the ith regulation point under the shielding layer-free protection state is i being a positive integer from 1 to n, and n being 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 calculation formula of the current value of the tuning coefficient is:
wherein lambda is 1,i For the current value of the tuning coefficient at the ith control point, n 1,i For the number of turns of the coil connected with the core wire at the ith control point, n 2,i The number of turns of the coil connected with the shielding layer at the ith regulating point is i, which is a positive integer from 1 to n, and n is the number of regulating points.
5. A track traffic information transmission cable shielding protection system, the system comprising: at least one regulation module; each regulation and control module is respectively arranged at different positions of the information transmission cable, and the arrangement positions of the regulation and control modules are respectively used as different regulation and control points; each regulation and control module comprises:
the monitoring unit is used for acquiring longitudinal induced electromotive force on the core wire at the corresponding regulation 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 is used for determining a tuning coefficient target value at a corresponding regulation and control point based on the induced longitudinal potential monitoring value;
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 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;
the information transmission cable includes: the cable comprises an outer protective layer, an armor layer, an inner liner layer, a sheath, an insulating layer, a core wire and an insulating single wire; the outer protective layer is positioned on the outermost layer; the armor layer is positioned on the inner layer of the outer protective layer; the inner lining layer is positioned on the inner layer of the armor layer; the sheath is positioned on the inner layer of the inner liner; the plurality of core wires are divided into four groups, and the core wires of each group are intertwined into a columnar structure and are positioned at the innermost layer of the information transmission cable together; the outer layer of each columnar structure is wrapped with an insulating layer; the insulating single wire is positioned between the insulating layer and the sheath;
each shielding protection unit 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 control points, and the taps are used for adjusting the coil turn ratio of the core wires and the shielding layers at the control 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;
the tap control subunit is respectively connected with the monitoring unit, the tuning unit and the tap at the corresponding regulation points 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 point of the information transmission cable to be respectively equal to the corresponding tuning coefficient target value.
6. The shielding protection system for a track traffic information transmission cable of claim 5, wherein the tuning coefficient target value has a calculation formula:
wherein lambda is 0,i For tuning coefficient target value at the ith regulation point, V 1,i Is the monitoring value of the induced longitudinal potential at the ith control point, V 2,i And i is a positive integer from 1 to n, and n is the number of the regulating points.
7. The shielding protection system for a track traffic information transmission cable according to claim 6, wherein the calculation formula of the voltage value to be eliminated is:
V 2,i ＝V 1,i -V 0,i ；
V 0,i ＝γV i ；
wherein V is 2,i To-be-eliminated voltage value at the ith regulation point, V 1,i Is the monitoring value of the induced longitudinal potential at the ith control point, V 0,i Is the induced longitudinal potential regulation target value at the ith regulation point, gamma is the shielding coefficient target value of the information transmission cable, V i The induction voltage of the core wire at the ith regulation point under the shielding layer-free protection state is i being a positive integer from 1 to n, and n being the number of the regulation points.
8. The shielding protection system for a track traffic information transmission cable of claim 5, wherein the current tuning coefficient value is calculated by the formula:
wherein lambda is 1,i For the current value of the tuning coefficient at the ith control point, n 1,i For the ith adjustmentThe number of turns of the coil connected with the core wire at the control point, n 2,i The number of turns of the coil connected with the shielding layer at the ith regulating point is i, which is a positive integer from 1 to n, and n is the number of regulating 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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| CN114709025A (en) | 2022-07-05 |
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