CN112904110B - Rail vehicle electrical performance measuring method - Google Patents
Rail vehicle electrical performance measuring method Download PDFInfo
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- CN112904110B CN112904110B CN202110062740.8A CN202110062740A CN112904110B CN 112904110 B CN112904110 B CN 112904110B CN 202110062740 A CN202110062740 A CN 202110062740A CN 112904110 B CN112904110 B CN 112904110B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
- G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Abstract
The invention provides a rail vehicle electrical performance measuring method, which comprises the following steps: measuring the impedance of a skin shielding layer of a vehicle body of the railway vehicle; measuring the impedance of a body grounding network of the vehicle body; measuring impedance between a skin shielding layer between adjacent bodies of the rail vehicle and a vehicle body grounding network; measuring stray current on the skin shielding layer; stray currents of busbars in a car body earth network are measured. The parameters of key parts related to the shielding and grounding performance of the railway vehicle can be effectively obtained by measuring the impedance of the skin shielding layer, measuring the impedance of the vehicle body grounding network, measuring the impedance between the skin shielding layer between adjacent vehicles and the vehicle body grounding network, measuring the stray current on the skin shielding layer and measuring the stray current of a bus bar in the vehicle body grounding network. By utilizing the acquired parameters, the shielding and grounding performance of the railway vehicle can be effectively evaluated.
Description
Technical Field
The invention relates to the technical field of rail vehicles, in particular to a method for measuring the electrical performance of a rail vehicle.
Background
For current rail vehicles, there is a technology that utilizes carbon fiber composite materials as rail vehicle machined parts. However, the electrical conductivity of the carbon fiber composite material is lower than that of metal materials such as stainless steel or aluminum alloy by multiple orders of magnitude, and the electromagnetic compatibility of the whole rail vehicle is negatively affected due to the problems that the shielding and grounding functions are weakened and the like caused by the fact that the vehicle body material is changed from metal to the carbon fiber composite material.
Therefore, for the current rail vehicle manufacturing technology, a corresponding measurement method is needed to evaluate the shielding and grounding performance of the rail vehicle made of the carbon fiber composite material.
Disclosure of Invention
The invention provides a method for measuring the electrical performance of a railway vehicle, which is used for solving the defect that the prior art can not carry out related shielding and grounding performance auxiliary evaluation on the railway vehicle made of carbon fiber composite materials.
The invention provides a rail vehicle electrical performance measuring method, which comprises the following steps: measuring the impedance of a skin shielding layer of a vehicle body of the railway vehicle; measuring the impedance of a body grounding network of the body of the rail vehicle; measuring the impedance between a skin shielding layer between adjacent bodies of the railway vehicle and a vehicle body grounding network; measuring stray current on the skin shielding layer; and measuring the stray current of the bus bar in the vehicle body grounding network.
According to the method for measuring the electrical performance of the railway vehicle, the method for measuring the impedance of the skin shielding layer of the vehicle body of the railway vehicle comprises the following steps: and measuring the contact resistance between two adjacent exposed copper meshes in the plurality of exposed copper meshes at the edge of the skin of the single skin.
According to the method for measuring the electrical performance of the rail vehicle, the impedance of the skin shielding layer of the vehicle body of the rail vehicle is measured, and the method further comprises the following steps: and measuring the contact resistance between the adjacent exposed copper meshes on two sides of the abutted seam between the two adjacent skins.
According to the method for measuring the electrical performance of the rail vehicle, the impedance of the skin shielding layer of the vehicle body of the rail vehicle is measured, and the method further comprises the following steps: and measuring contact resistance between the exposed copper mesh at the lower edge parts of the skins at two sides of the vehicle body and a vehicle body chassis of the vehicle body and between the exposed copper mesh and bus bars of the vehicle body grounding network.
According to the method for measuring the electrical performance of the railway vehicle, the method for measuring the impedance of the skin shielding layer of the vehicle body of the railway vehicle comprises the following steps: and connecting metal electrodes between two adjacent exposed copper meshes of the single skin and between two adjacent exposed copper meshes on two sides of the abutted seam between two adjacent skins to measure the resistance between the multiple exposed copper meshes of the single skin and the resistance between the multiple exposed copper meshes of the two adjacent skins.
According to the method for measuring the electrical performance of the rail vehicle, the method for measuring the impedance of the body grounding network of the body of the rail vehicle comprises the following steps: and selecting the center of the boundary beam of the vehicle body as a zero potential reference point, and measuring the contact resistance between the zero potential reference point and the intersection node of each bus bar in the vehicle body grounding network.
According to the method for measuring the electrical performance of the rail vehicle provided by the invention, the impedance of the body grounding network of the body of the rail vehicle is measured, and the method further comprises the following steps: and measuring the contact resistance between adjacent cross nodes of the bus bars in the vehicle body grounding network.
According to the method for measuring the electrical performance of the railway vehicle, the impedance between the skin shielding layer between the adjacent vehicle bodies of the railway vehicle and the vehicle body grounding network is measured, and the method comprises the following steps: applying power frequency current and pulse current between the grounding seat of the vehicle body and the connecting bus bar of the adjacent vehicle body; measuring the voltage between the grounding seat of the vehicle body and the connecting bus bar of the adjacent vehicle body; and obtaining power frequency impedance and impulse impedance based on the ratio of the voltage to the power frequency current and the pulse current.
According to the method for measuring the electrical performance of the rail vehicle, provided by the invention, the measurement of the stray current on the skin shielding layer comprises the following steps: measuring the potential difference and the impedance between the rivets on the skin shielding layer and the boundary beam of the vehicle body; and obtaining the current between the rivet on the skin shielding layer and the boundary beam of the vehicle body as the stray current based on the ratio of the potential difference to the impedance.
According to the method for measuring the electrical performance of the rail vehicle provided by the invention, the measurement of the stray current of the bus bar in the vehicle body grounding network comprises the following steps: a metal shielding box is sleeved outside the current sensor to shield a background magnetic field and an electric field; the current sensor and the metal shielding box penetrate through a bus bar in the vehicle body grounding network and are fixed with the vehicle body; measuring stray current of the busbar with the current sensor.
The rail vehicle electrical performance measuring method provided by the invention further comprises the following steps: selecting one or more of the following positions as the measuring point positions of the skin shielding layer: the lower edges of the skins on the two sides of the car body are connected with the edge beam of the car body, and the rivet is arranged at the connecting position of the skins of the car body and the adjacent car body.
The rail vehicle electrical performance measuring method provided by the invention further comprises the following steps: selecting one or more of the following positions as the measuring point positions of the stray current in the vehicle body grounding network: the bus bars are connected with the edge beams of the car body, the bus bars are connected with the adjacent car body, and the path between the car body grounding network and the in-car decoupling resistor is formed.
According to the method for measuring the electrical performance of the railway vehicle, the parameters of key parts related to the shielding and grounding performance of the railway vehicle can be effectively obtained by measuring the impedance of the skin shielding layer, the impedance of the vehicle body grounding network, the impedance between the skin shielding layer between adjacent vehicle bodies and the vehicle body grounding network, the stray current on the skin shielding layer and the stray current of the bus bar in the vehicle body grounding network. By utilizing the acquired parameters, the shielding and grounding performance of the railway vehicle can be effectively evaluated.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for measuring electrical properties of a rail vehicle according to the present invention;
FIG. 2 is a schematic diagram of a skin shield impedance measurement path;
FIG. 3 is a schematic diagram of an impedance measurement path at a splice of adjacent skins;
FIG. 4 is a schematic illustration of an impedance measurement using a metal electrode;
FIG. 5 is a schematic of a skin shield-chassis-bus bar anti-measurement path;
FIG. 6 is a schematic diagram of a vehicle body ground network node impedance measurement path;
FIG. 7 is a schematic diagram of the skin shield-car body ground network power frequency impedance and impulse impedance measurement paths;
FIG. 8 is a schematic illustration of skin potential measurement in a skin shield;
FIG. 9 is a schematic illustration of bus stray current measurement;
FIG. 10 is a schematic diagram of skin potential and the position of each measurement point of the vehicle body ground network;
reference numerals:
100: a rail vehicle electrical performance measuring method; s102 to S110: each step;
200: carbon fiber cloth on the surface layer; 202: exposing the copper mesh;
204: splicing; 206: a vehicle body underframe;
208: a bus bar; 210: a metal electrode;
212: a zero potential reference point; 214: a boundary beam;
216: riveting; 218: a voltage probe;
220: a current sensor; 222: a metal shield case;
224: a decoupling resistor.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
An embodiment of the rail vehicle electrical performance measurement method of the present invention is described below with reference to fig. 1 to 10. It is to be understood that the following description is only exemplary of the present invention and is not intended to limit the present invention in any way.
According to the description of the invention, the electrical conductivity of the carbon fiber composite material is lower than that of a metal material such as stainless steel or aluminum alloy by multiple orders of magnitude, and the electromagnetic compatibility of the whole railway vehicle can be negatively affected due to the problems of weakening of shielding and grounding functions and the like caused by the fact that the vehicle body material is changed from metal to the carbon fiber composite material. Therefore, for the current rail vehicle manufacturing technology, a corresponding measurement method is needed to evaluate the shielding and grounding performance of the rail vehicle made of the carbon fiber composite material.
Firstly, for a shielding system, as a large number of composite member glue riveting and splicing processes are adopted for assembling a composite material vehicle body, the lapping impedance of the composite material-metal/composite material-composite material is obviously increased compared with that of a metal welding line, the electric continuity of a skin shielding layer of a vehicle body outer cover is blocked, and the lapping boundary weakens the capacity of evacuating overvoltage, static electricity and lightning stroke large current; meanwhile, the interference of low-frequency magnetic field, indirect thunder strong electromagnetic pulse and the like of the traction equipment under the vehicle is also easily coupled into the vehicle body through discontinuous boundaries. Therefore, the electrical lap resistance performance of the composite material vehicle body mechanical connection is directly related to the shielding effectiveness of the whole vehicle.
Secondly, for a car body grounding network, the grounding metal network is used for replacing the original metal car body shell, although the grounding network path has designability, the existing metal car body has electric corrosion of a bearing and a carbon brush; interference of overvoltage to sensitive equipment; the problems of vehicle body stray current and the like still exist in a grounding network system, so the impedance characteristic of grounding network topology and the stray current rule directly influence the grounding performance of the whole vehicle.
In summary, according to the embodiments of the present invention, the measurement of the composite shielding grounding system of the vehicle body, such as the carbon fiber composite material, mainly includes the whole outer cover skin lapping, the skin and metal structural member lapping impedance measurement, the shielding layer distribution potential/current online monitoring, the grounding network and its node contact resistance, power frequency and impact impedance measurement, and the stray current online monitoring.
As shown in fig. 1, an embodiment of the invention provides a rail vehicle electrical performance measurement method 100. The rail vehicle electrical performance measurement method 100 may generally include the steps of:
s102: measuring the impedance of a skin shielding layer of a vehicle body of the railway vehicle;
s104: measuring the impedance of a body grounding network of a body of the rail vehicle;
s106: measuring impedance between a skin shielding layer between adjacent bodies of the rail vehicle and a vehicle body grounding network;
s108: measuring stray current on the skin shielding layer;
s110: measuring stray current of a bus bar in a vehicle body grounding network.
In summary, in the method 100 for measuring the electrical performance of the rail vehicle provided by the present invention, by measuring the impedance of the skin shielding layer, measuring the impedance of the vehicle body grounding network, measuring the impedance between the skin shielding layer and the vehicle body grounding network between adjacent vehicle bodies, measuring the stray current on the skin shielding layer, and measuring the stray current of the bus bar in the vehicle body grounding network, parameters of key parts related to the shielding and grounding performance of the rail vehicle can be effectively obtained. By utilizing the acquired parameters, the shielding and grounding performance of the railway vehicle can be effectively evaluated.
Specifically, the rail vehicle electrical performance measurement method 100 of the present invention can be applied to a rail vehicle with a composite shield grounding system. The composite shielding grounding system comprises a carbon fiber skin outer cover containing a copper mesh-nickel-plated carbon fiber cloth shielding layer, a metal busbar grounding network and an electric connection structure among the skin, the busbar and the skin, the grounding network, the boundary beam and the metal vehicle body underframe. The carbon fiber skin outer cover and the metal bus bar network form a composite shielding grounding system through an electric connection structure. The system is connected with the underframe under the vehicle, then is connected with the decoupling resistor in series, the grounding device is grounded through the shaft end, and the tail part of the grounding network is connected with the metal vehicle body of the rear vehicle through the bus bar.
First, as shown in fig. 2 and 3, in the embodiment of the present invention, the step of measuring the impedance of the skin shielding layer of the car body of the railway car may include the following aspects:
measuring contact resistance between two adjacent exposed copper meshes in a plurality of exposed copper meshes at the edge of the skin of the single skin;
measuring the contact resistance between adjacent exposed copper meshes on two sides of the abutted seam between two adjacent skins;
and measuring contact resistance between the exposed copper mesh at the lower edges of the skins at two sides of the vehicle body and a vehicle body underframe of the vehicle body and between the exposed copper mesh and a bus bar of a vehicle body grounding network.
It should be understood that the rail vehicle electrical performance measurement method 100 of the present invention may include only one of the measurement steps described above, may include several of the measurement steps, or may include all of the measurement steps. This may be the case and need, and the invention is not limited to a particular situation.
In a specific measurement process, for impedance measurement of the skin shielding layer, as shown in fig. 2, in a skin forming process, a certain number of exposed copper meshes 202 are reserved at a surface carbon fiber cloth 200 at the edge of the skin, and contact resistance between the exposed copper meshes 202 at the edge of a single skin can be measured. As shown in fig. 3, when two adjacent skins are spliced, the joint 204 is filled with conductive adhesive, so that the contact resistance between the exposed copper meshes 202 on two sides of the joint 204 can be measured. In addition, as shown in fig. 5, the contact resistance between the bare copper mesh 202 covering the lower skin edge of the vehicle body on both sides and the vehicle body chassis 206 and the bus bar 208 can also be measured.
As shown in fig. 4, the step of measuring the impedance of the skin shield of the body of the rail vehicle may further include:
and connecting metal electrodes between two adjacent exposed copper meshes of the single skin and between two adjacent exposed copper meshes on two sides of the abutted seam between two adjacent skins to measure the resistance between the multiple exposed copper meshes of the single skin and the resistance between the multiple exposed copper meshes of the two adjacent skins.
In other words, in the actual measurement process, the resistances between a plurality of exposed copper meshes of one skin and the copper meshes of the adjacent skin can be measured at one time through the elongated metal electrode 210 according to the requirement.
As further shown in fig. 6, the step of measuring the impedance of the body ground network of the body of the rail vehicle may include:
selecting the center of a boundary beam of the vehicle body as a zero potential reference point, and measuring the contact resistance between the zero potential reference point and the cross node of each bus bar in the vehicle body grounding network;
and measuring the contact resistance between adjacent crossed nodes of the busbars in the vehicle body grounding network.
It should be understood that the rail vehicle electrical performance measurement method 100 of the present invention may include only one of the measurement steps described above, may include several of the measurement steps, or may include all of the measurement steps. This may be the case and need, and the invention is not limited to a particular situation.
Specifically, as shown in fig. 6, for the impedance measurement of the vehicle body ground network, the center of the side sill may be taken as a zero potential reference point 212, and then the contact resistance between the zero potential reference point 212 and the node (i.e., the cross node) of each bus bar 208, the contact resistance between two adjacent cross nodes, and the high frequency impedance thereof may be measured. After data measurement, these impedance parameters are important basis for establishing a grounding network model and analyzing the transient voltage propagation characteristics.
As further shown in fig. 7, in one embodiment of the present invention, the step of measuring the impedance between the skin shield and the vehicle body grounding network between adjacent vehicle bodies of the rail vehicle may comprise:
applying power frequency current and pulse current between a grounding seat of the vehicle body and a connecting bus bar of an adjacent vehicle body;
measuring the voltage between a grounding seat of the vehicle body and a connecting bus bar of an adjacent vehicle body;
and obtaining the power frequency impedance and the impulse impedance based on the ratio of the voltage to the power frequency current to the pulse current.
Specifically, for the ground path of the shield-grounded system: under the vehicle, the skin shielding layer and the grounding network are connected with the vehicle body underframe 206 through the aluminum alloy boundary beam 214, and after the grounding seat of the vehicle body underframe 206 is connected with the decoupling resistor in series, the grounding device is grounded through the shaft end. Between two adjacent workshops, the grounding network is electrically connected with the rear metal car body through the bus bar 208. As shown in fig. 7, the power frequency impedance and the impulse impedance can be obtained by applying the power frequency current and the pulse current between the vehicle body grounding seat and the bus bars 208 connected with the two vehicles, and then measuring the voltage between the grounding seat and the bus bars 208 connected with the two vehicles, and the ratio of the power frequency current to the pulse current.
As shown in fig. 8, in an embodiment of the present invention, the step of measuring the stray current on the skin shielding layer may include:
measuring the potential difference and impedance between the rivets on the skin shielding layer and the boundary beam of the vehicle body;
based on the ratio of the potential difference to the impedance, the current between the rivet on the skin shielding layer and the side beam of the vehicle body is obtained as the stray current.
Specifically, for skin shield measurements, when over-voltage, static, or lightning high current is coupled to the vehicle body, the skin has a large overlap impedance with the aluminum alloy boundary beam 214 and skin patchwork, and a large potential difference may exist at the impedance discontinuity boundary. As shown in fig. 8, the electrical continuity between the lap rivet 216 and the skin shield is used to monitor the potential difference between the rivet 216 and the grounded side beam 214 via the voltage probe 218, and since the voltage probe 218 has a high input impedance, the impedance of the rivet 216 is negligible. Then, based on the ratio of the potential difference and the impedance, the current between the rivet 216 on the skin shield layer and the side sill 214 of the vehicle body can be obtained as a stray current. Further, the impedance between the rivets 216 may be measured first, and the surface current flowing between the rivets 216 on the shield layer may be approximated by the difference in potential between them and the impedance ratio.
Referring now to fig. 9, in an embodiment of the present invention, the step of measuring the stray current of the busbar in the vehicle body grounding network may include:
a metal shielding box is sleeved outside the current sensor to shield a background magnetic field and an electric field;
the current sensor and the metal shielding box penetrate through a bus bar in a vehicle body grounding network and are fixed with a vehicle body;
the stray current of the busbar is measured with a current sensor.
Specifically, for the stray current measurement of the grounding network metal bus bar 208, static and alternating magnetic field noise is distributed in the whole space of the vehicle, wherein the direct current magnetic field is up to a few milli-tess, and the noise of the magnetic field in the vehicle is large and unevenly distributed due to the large interference of the background magnetic field. Therefore, in order to improve the magnetic field environment adaptability of current sensors of different types and different installation positions, the magnetic field is shielded before the stray current of the aluminum bar is measured.
As shown in FIG. 9, the current sensor 220 is externally shielded from the background magnetic field and the electric field by a metal shielding box 222, the metal shielding box 222 is composed of three layers of 0.3mm magnetic metal sheet and one layer of 0.3mm copper sheet, the layers are sequentially silicon steel-permalloy or amorphous alloy-silicon steel-copper from outside to inside, and the magnetic permeability of the magnetic material is between 103 and 104. And insulating glue is coated between each layer of metal material. The current sensor 220 and the metal shielding box 222 penetrate through the bus bar 208 to be fixed with a vehicle body structural member, and the bus bar 208 can be replaced by flexible connection in a narrow space, so that the installation is more convenient.
It should be noted here that the current sensor 220 may include a shunt resistor type, a current transformer, a rogowski coil, a hall, a giant magnetoresistance, a fiber optic current sensor, and the like. The shunt resistance type measurement is invasive measurement, and the integrity of an original structural part can be damaged; the current transformer and the Rogowski coil have large volumes and cannot measure direct current; fiber optic current sensors, open-loop non-contact hall and giant magnetoresistive sensors may be subject to strong magnetic field interference in the vehicle. Therefore, closed loop hall or giant magnetoresistance current sensors with a flux-concentrating core that can measure both dc and ac are preferred.
With further reference to FIG. 10, in an embodiment of the invention, one or more of the following positions may be chosen as the station positions for the skin shield: the lower edges of the skin on two sides of the vehicle body and the boundary beam of the vehicle body, and the rivet at the connecting position of the skin of the vehicle body and the adjacent vehicle body. Furthermore, in other embodiments, one or more of the following positions may be chosen as the station positions for stray currents in the vehicle body ground network: the bus bars connected with the edge beams of the car body, the bus bars connected with the adjacent car body and the passages between the car body grounding network and the lower coupling resistor of the car.
In particular, the connection locations of the vehicle body cover and ground network with the vehicle body underframe and the rear vehicle body are the main electromagnetic coupling paths between the vehicle bodies, and the potential and stray current at these locations should be monitored primarily in a distributed manner. As shown in fig. 10, the skin shielding layer measuring point positions are mainly arranged on the rivets at the connecting positions of the skin lower edges and the side beams 214 on the two sides and the skin and the rear vehicle body, and are marked by circle symbols in fig. 10; ground network stray current measurement points are primarily disposed in the path between the ground network and the side rails 214, the bus bars 208 attached to the rear metal car body, and the in-car decoupling resistors 224, which are marked with triangular symbols in fig. 10.
In summary, the embodiments of the present invention provide a measurement method related to a carbon fiber car body shielding grounding system. According to the structural characteristics of the composite material vehicle body shielding grounding system and the measurement method provided by the operation working condition, the measurement result can be used as the basis for evaluating the performance of the carbon fiber composite material railway vehicle shielding grounding system, and technical reserve is provided for the composite material vehicle body shielding grounding system and the electromagnetic compatibility design.
It should also be noted that in some embodiments, the rail vehicles involved in embodiments of the present invention may be any suitable type of vehicle, such as subways, metro trains, express trains, railcars, etc., and embodiments of the present invention are not limited to a particular rail vehicle type or types. This can be selected according to the actual application needs. Similarly, in other embodiments, the rail vehicle body may be a body of an intermediate car or a cab car, and may be selected according to actual application needs.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A rail vehicle electrical performance measurement method is characterized by comprising the following steps:
measuring the impedance of a skin shielding layer of a vehicle body of the railway vehicle;
measuring the impedance of a body grounding network of a body of the rail vehicle, wherein the center of a side beam of the body is selected as a zero potential reference point, and the contact resistance between the zero potential reference point and the intersection node of each bus bar in the body grounding network is measured;
measuring impedance between a skin shielding layer between adjacent bodies of the rail vehicle and a vehicle body grounding network;
measuring stray current on the skin shielding layer;
and measuring the stray current of the bus bar in the vehicle body grounding network.
2. The rail vehicle electrical performance measurement method according to claim 1, wherein the measuring the impedance of the skin shielding layer of the body of the rail vehicle comprises:
and measuring the contact resistance between two adjacent exposed copper meshes in the plurality of exposed copper meshes at the edge of the skin of the single skin.
3. The rail vehicle electrical performance measurement method according to claim 2, wherein the measuring the impedance of the skin shielding layer of the vehicle body of the rail vehicle further comprises:
and measuring the contact resistance between the adjacent exposed copper meshes on two sides of the abutted seam between the two adjacent skins.
4. The rail vehicle electrical performance measurement method according to claim 3, wherein the measuring the impedance of the skin shielding layer of the vehicle body of the rail vehicle further comprises:
and measuring contact resistance between the exposed copper mesh at the lower edge parts of the skins at two sides of the vehicle body and a vehicle body chassis of the vehicle body and between the exposed copper mesh and bus bars of the vehicle body grounding network.
5. The rail vehicle electrical performance measurement method according to claim 1, wherein the measuring the impedance of the skin shielding layer of the body of the rail vehicle comprises:
and connecting metal electrodes between two adjacent exposed copper meshes of the single skin and between two adjacent exposed copper meshes on two sides of the abutted seam between two adjacent skins to measure the resistance between the multiple exposed copper meshes of the single skin and the resistance between the multiple exposed copper meshes of the two adjacent skins.
6. The rail vehicle electrical performance measurement method according to claim 1, wherein the measuring the impedance of a body ground network of a body of the rail vehicle further comprises:
and measuring the contact resistance between adjacent crossed nodes of the busbars in the vehicle body grounding network.
7. The rail vehicle electrical performance measurement method according to claim 1, wherein the measuring impedance between a skin shielding layer between adjacent bodies of the rail vehicle and a body grounding network comprises:
applying power frequency current and pulse current between the grounding seat of the vehicle body and the connecting bus bar of the adjacent vehicle body;
measuring the voltage between the grounding seat of the vehicle body and the connecting bus bar of the adjacent vehicle body;
and obtaining power frequency impedance and impulse impedance based on the ratio of the voltage to the power frequency current and the pulse current.
8. The rail vehicle electrical performance measurement method of claim 1, wherein the measuring stray currents on the skin shield layer comprises:
measuring the potential difference and the impedance between the rivets on the skin shielding layer and the boundary beam of the vehicle body;
and obtaining the current between the rivet on the skin shielding layer and the boundary beam of the vehicle body as the stray current based on the ratio of the potential difference to the impedance.
9. The rail vehicle electrical performance measurement method of claim 1, wherein the measuring stray currents of busbars in the vehicle body grounding network comprises:
a metal shielding box is sleeved outside the current sensor to shield a background magnetic field and an electric field;
enabling the current sensor and the metal shielding box to penetrate through a bus bar in the vehicle body grounding network and be fixed with the vehicle body;
measuring stray current of the busbar with the current sensor.
10. The rail vehicle electrical performance measurement method according to any one of claims 1 to 9, characterized by further comprising:
selecting one or more of the following positions as the measuring point positions of the skin shielding layer: the lower edges of the skins on the two sides of the car body are connected with the edge beam of the car body, and the rivet is arranged at the connecting position of the skins of the car body and the adjacent car body.
11. The rail vehicle electrical performance measurement method according to any one of claims 1 to 9, characterized by further comprising:
selecting one or more of the following positions as the measuring point positions of the stray current in the vehicle body grounding network: the bus bars are connected with the edge beams of the car body, the bus bars are connected with the adjacent car body, and the path between the car body grounding network and the in-car decoupling resistor is formed.
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