CN107609208B - Traction network modeling method considering tunnel section comprehensive grounding system structure - Google Patents
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Abstract
The invention discloses a traction network modeling method considering a tunnel section comprehensive grounding system structure, which comprises the following steps: firstly, drawing a traction backflow network in a tunnel on an SESCAD tool interface of CDEGS software; secondly, simulating and calculating the initial grounding impedance of each grounding electrode unit by using an MALZ engineering module; then, a traction network chain type model is established according to the reality of the direct power supply system with the return line; and finally determining the comprehensive earth electrode impedance of the chain model of the traction network of the tunnel road section by adopting an iteration method by taking the constraint condition that the earth reflux coefficient of the tunnel region obtained by the chain model simulation is almost consistent with the earth reflux coefficient set when the earth electrode impedance is extracted by using CDEGS software, thereby completing the establishment of the simulation model of the traction network of the tunnel road section. The method can effectively model the traction power supply system in the tunnel on the basis of extracting the accurate parameters of the comprehensive grounding system in the tunnel section.
Description
Technical Field
The invention relates to the field of traction network model establishment, in particular to a traction network modeling method based on a MALTAB/Simulink platform and applied to a direct power supply mode with a return line in an electrified railway tunnel.
Background
At present, in view of the problems of over-voltage of trains, lifting of rail potential, electromagnetic interference, harmonic resonance of traction network and the like in the electric railways, the research of basic theories related to the electric railways is urgent and necessary. The accurate description of the mathematical model of the electrified railway traction network and the accurate mastering of the electrical parameters are the prerequisites for developing the research of the traction power supply system.
Many scholars at home and abroad use the multi-conductor transmission theory to research a mathematical model of the traction network, many scholars establish different chain models for the traction networks with different power supply modes, and the problems of voltage distribution along the line, harmonic resonance characteristics of the traction network, steel rail potential distribution, leakage current, common lightning strike of the railway or bow net off-line electric arc, electromagnetic interference caused by vehicle body electrical equipment and the like are analyzed based on the simulation.
The chain model combines the reality that the traction network is a complete complex network structure consisting of a plurality of transmission lines, and considers the inductive and capacitive coupling among the wires without shielding layers in the traction network, such as a contact network, a steel rail, a return line, a through ground wire and the like, so that the electrical distribution characteristic of the traction network can be accurately reflected. The comprehensive grounding system of the traction network is not only a grounding system of weak current equipment such as communication and signals along the railway, but also an important path of traction backflow, and the accurate electrical parameters of the comprehensive grounding system are considered in the chain model to be very necessary for analyzing and avoiding the through ground wire and the potential rise nearby the through ground wire. Different from roadbed engineering, an electrical grounding system of a tunnel section is very complex, and parameter calculation relates to a calculation method of impedance parameters such as steel frame or annular grounding steel bars, a bottom plate grounding electrode and the like.
However, existing traction network electrical models for tunnel segments tend to simplify the processing of their integrated ground topology and parameters. In view of this, it is necessary to consider the complex electrical grounding system of the traction power supply system in the traction network chain model building of the tunnel section.
Disclosure of Invention
The invention aims to solve the technical problem of providing a traction network modeling method considering a tunnel section comprehensive grounding system structure, and obtaining an accurate solution of the impedance of a tunnel section grounding electrode so as to complete the accurate modeling of a traction network.
In order to solve the technical problems, the invention adopts the technical scheme that:
a traction network modeling method considering a tunnel section comprehensive grounding system structure comprises the following steps:
step 1: analyzing an electrical structure of a comprehensive grounding system in a tunnel, establishing a traction backflow network model in the tunnel based on current distribution, electromagnetic field, grounding and soil structure analysis software (CDEGS software for English abbreviation) developed by Canada safety engineering technology company according to an electrical topology formed by through ground wires, longitudinal grounding steel bars, circumferential grounding steel bars, a bottom plate grounding network, connecting steel bars, transverse connecting lines and mutual connection according to actual electrical arrangement, and setting an initial amount of a tunnel region earth backflow coefficient;
step 2: setting an excitation source of the traction reflux network model in the tunnel built in the step 1, and extracting the impedance of a grounding electrode of the comprehensive through ground wire by adopting a frequency domain grounding analysis Module (MALZ);
and step 3: carrying out electrical structure analysis on the traction network with the return line direct supply mode of the tunnel section, and building a corresponding chain model by adopting MATLAB/Simulink;
and 4, step 4: extracting the earth electrode impedance at each connecting point by adopting an MALZ engineering module, substituting the extracted earth electrode impedance into the chain model in the step 3, and obtaining the earth reflux coefficient of the tunnel region through simulation;
and 5: calculating relevant electrical parameters of contact networks, steel rails, return lines and through ground wires of the road base section and the tunnel section; the parameters of the roadbed section are calculated by adopting a simplified Carson formula, and the parameters of the tunnel section are calculated by adopting a Tylavsky formula;
step 6: and (3) comparing the earth reflux coefficient of the tunnel region obtained by simulation in the step (4) with the earth reflux coefficient reset by CDEGS software, judging whether the earth reflux coefficient of the tunnel region obtained by simulation of the MATLAB/Simulink chain model approaches the corresponding earth reflux coefficient of the tunnel region set in the step (1), if so, finishing the establishment of the traction reflux network model, otherwise, sequentially executing the step (2), the step (3) and the step (4) to form cycle iteration until the earth reflux coefficient of the tunnel region obtained by simulation of the MATLAB/Simulink chain model approaches the corresponding earth reflux coefficient of the tunnel region set in the step (1), and finally finishing the establishment of the traction reflux network model.
Further, when the excitation source is set in the step 2, if the locomotive is positioned outside the tunnel, setting traction backflow current outside the tunnel opening relatively far away from the traction substation as an input excitation source, and setting traction backflow current at the tunnel opening relatively close to the traction substation as an output excitation source; if the locomotive is positioned in the tunnel, the locomotive load current is set as an input excitation source, and the traction return current relatively close to the tunnel opening of the traction substation is set as an output excitation source.
Further, the analyzing the electrical structure of the comprehensive grounding system in the tunnel in the step 1 specifically includes:
according to the electrical connection structure section of the tunnel comprehensive grounding system with the return line direct supply mode, the up-down through ground wires are respectively connected with a longitudinal grounding steel bar at the corresponding position through a connecting steel bar every 100 meters, and the left longitudinal grounding steel bar and the right longitudinal grounding steel bar at the connecting point are disconnected; every other trolley distance, a grounding network formed by the bottom plate grounding electrode, the annular structural steel bars and other longitudinal grounding steel bars is connected with the longitudinal grounding steel bars at the through ground wire at the same position, and the return lines are connected with the annular structural steel bars at intervals of 35 meters; every 500 m, every reflow wire is connected with every other reflow wire.
Further, the traction net chain model in the step 3 comprises a parallel element and a series element; the series elements as parallel multi-conductor transmission lines are cut at intervals by parallel elements such as equipotential transverse connection lines of a reflux network, a traction substation, a train and the like; the traction network model is divided into a plurality of series sub-network models according to the positions of the parallel elements, and each sub-network model comprises inductive coupling and capacitive coupling of parallel multi-conductor transmission lines.
Compared with the prior art, the invention has the beneficial effects that: the method can effectively model the traction power supply system in the tunnel on the basis of extracting the accurate parameters of the tunnel section comprehensive grounding system. The method provides a relevant model foundation for the refined design of a traction power supply system of a tunnel section, solves the problems of over-voltage of a railway train, potential lifting of a steel rail, electromagnetic interference, harmonic resonance of a traction network and the like, and creates conditions for overcoming and solving the technical problems of prominence or invisibility in the current railway electrification engineering.
Drawings
Fig. 1 is a cross section of an electrical connection structure of a tunnel integrated grounding system with a return line direct supply mode.
Fig. 2 is a tunnel section traction network chain model based on a detailed consideration of a tunnel section integrated grounding system.
Fig. 3 is a traction return network of the intra-tunnel or tunnel entrance to locomotive interval drawn by the scacd tool.
Fig. 4 is an iterative process for accurately determining the comprehensive earth electrode impedance of the tunnel section traction network chain model.
FIG. 5 is a traction network chain model for the short-circuit test verification of a near-river spread substation.
FIG. 6 is a chain model simulation result for the short circuit test verification of the electric substation near the river.
Detailed Description
The present invention will be described in further detail with reference to the drawings and the detailed description.
The invention relates to a traction power supply system with a return line direct power supply mode in an electrified railway applied to a tunnel section, and a traction network modeling method considering a comprehensive grounding system in a tunnel in detail comprises the following steps:
analyzing an electrical structure of the comprehensive grounding system in the tunnel, and establishing a traction backflow network model in the tunnel based on CDEGS software according to an electrical topology formed by a through ground wire, a longitudinal grounding steel bar, an annular grounding steel bar, a bottom plate grounding network, a connecting steel bar, a transverse connecting line and mutual connection according to actual electrical arrangement.
And secondly, setting an excitation source of the established model. Considering unknown current leaked to the ground by the return conductors at two ends of the model, extracting the earth electrode impedance at the connection part of the up-down through ground wire and the connecting steel bar at every 100 meters and the earth electrode impedance at the connection part of the up-down return wire and the annular earth steel bar at every 35 meters in the tunnel under the premise of setting the input excitation source and the output excitation source to be equal.
And thirdly, carrying out electrical structure analysis on the traction network with the return line direct supply mode considering the tunnel section, and building a corresponding chain model by utilizing MATLAB/Simulink. And respectively carrying out electric parameter calculation on the guide lines of the road bed section and the tunnel section except the tunnel comprehensive grounding system. And the relevant parameters of the roadbed road section are calculated by adopting a simplified Carson formula, and the relevant parameters of the tunnel road section are calculated by adopting a Tylavsky formula.
And fourthly, substituting the earth electrode impedance extracted in the second step into the chain model in the third step, obtaining the earth reflux coefficient of the tunnel region through simulation, if the simulation result is different from the earth reflux coefficient assumed in the third step, adjusting the input and output excitation source in the third step according to the MATLAB/Simulink simulation result, repeating the third step and the process of substituting the corresponding extraction result into the chain model for simulation to obtain new traction reflux current, comparing the new traction reflux current with the earth reflux coefficient reset by CDEGS software again, and thus forming cycle iteration until the earth reflux coefficient of the tunnel region obtained through the MATLAB/Simulink chain model simulation approaches the earth reflux coefficient of the tunnel region set in the corresponding second step, and further finally determining the comprehensive earth electrode impedance of the chain model of the traction network of the tunnel road section.
In the first step, according to the electrical connection structure section of the tunnel integrated grounding system with the return line direct supply mode shown in fig. 1, the up-down through ground wires are respectively connected with a longitudinal grounding steel bar at a corresponding position through a connecting steel bar every 100 meters, and the left longitudinal grounding steel bar and the right longitudinal grounding steel bar at the connecting point are disconnected; every other trolley distance, a grounding network formed by the bottom plate grounding electrode, the annular structural steel bars and other longitudinal grounding steel bars is connected with the longitudinal grounding steel bars at the through ground wire at the same position, and the return lines are connected with the annular structural steel bars at intervals of 35 meters; every 500 m, every reflow wire is connected with every other reflow wire. In view of this, if the ground electrode impedance at the connection between the up-down through ground wire and the connection steel bar (such as 1,2, 7, and 8 in fig. 1) and the ground electrode impedance at the connection between the return wire and the circumferential ground steel bar (such as 3, 4, 5, and 6 in fig. 1) at intervals of 35 meters can be determined by taking 100 meters between two adjacent connections between the through ground wire and the longitudinal ground steel bar as a unit, the detailed structure of the comprehensive grounding system of the tunnel section at the power frequency can be reflected.
In combination with the electrical structure of the tunnel integrated grounding system shown in fig. 1, an sescd tool is adopted to establish a traction return network model in a tunnel or between a tunnel entrance and a locomotive, and for a traction return conductor, actual parameters such as resistivity, radius, coating, size and position of the traction return conductor are defined; and defining the soil resistivity and the soil shape and structure parameters of the soil where the through ground wire and the grounding steel bar are located. The established traction return network is shown in fig. 3.
In the second step, if the locomotive is positioned outside the tunnel, setting traction reflux current outside a tunnel entrance relatively far away from a traction substation as an input excitation source, and setting traction reflux current at the tunnel entrance relatively close to the traction substation as an output excitation source (a return electrode); if the locomotive is positioned in the tunnel, the locomotive load current is set as an input excitation source, and the traction return current relatively close to the tunnel opening of the traction substation is set as an output excitation source. Considering that the current leakage from the return conductor to earth ground in the tunnel is small and unknown, the current leakage from the return conductor to earth ground is assumed to be zero by setting the input and output excitation sources equal.
A series of measuring points are arranged between the grounding grid and the far-end return electrode, and the measuring points are arranged at the connecting points between the through ground wire and the connecting steel bars at intervals of 100 meters and the connecting points between the return wire and the connecting steel bars at intervals of 35 meters in the whole traction grid of the tunnel section. The current of the connecting steel bar is tested through an ammeter, the potential of a measuring point is tested through a voltmeter, and the ratio of the voltage to the current is the initial grounding electrode impedance of the corresponding position based on simulation calculation of a frequency grounding analysis Module (MALZ) engineering module.
In a third step, the traction network chain model comprises parallel elements and series elements. Series elements as parallel multi-conductor transmission lines are cut at intervals by parallel elements such as equipotential transverse connection lines of a return network, traction substations, trains, etc. Depending on the location of the parallel elements, the traction network model can be divided into a number of series connected sub-network models. Each sub-network comprises inductive coupling and capacitive coupling of parallel multi-conductor transmission lines. As the through ground wire is buried underground, the direct compound line power supply system chain model with the return line considers the uplink and downlink contact lines, the carrier cable, the return line and 10 leads of two steel rails. In order to reduce the calculation amount, the equivalent combination is carried out on the multiple conductors, which is specifically as follows:
assuming that the voltage drop per unit length of the return line, the two steel rails, the catenary, the contact line and the descending catenary, the contact line, the two steel rails and the return line in the ascending order is U1、U2、…、U10The current flowing is sequentially I1、I2、…、I10Self-impedance per unit length of Zi( i 1,2, …,10) and a mutual impedance per unit length of Zij(i, j is 1,2, …,10), the relationship of voltage drop, current and impedance matrix of 10 wires is shown in formula (1).
Transforming the formula (1) to obtain:
the contact lines and the carrier cables at the positions of the upper line and the lower line are combined into a contact net, and the two steel rails are combined into one equivalent steel rail. Considering that the current of the contact net is equal to the sum of the current of the catenary and the current of the contact line, the contact net, the catenary and the contact line are equal to the ground potential, the sum of two steel rails at each position of the upper row and the lower row is equal to the current of the combined steel rails, the ground potential of the two steel rails is equal to the ground potential of the combined steel rails, and the combined impedance matrix can be obtained through a transformation formula (2) and is shown as a formula (3), namely a 6 x 6 order matrix.
Supposing that the charges per unit length of the upward return line, the two steel rails, the catenary cable, the contact line, the downward catenary cable, the contact line, the two steel rails and the return line are q in turn1、q2、…、q10The coefficient of self-potential per unit length is Zi( i 1,2, …,10) and a mutual potential coefficient per unit length of Zij(i, j is 1,2, …,10), and the relational expression of the 10 wires to the ground potential, the potential coefficient matrix and the charge matrix is shown in formula (4).
Inverting the potential coefficient matrix shown in the formula (4) to obtain:
considering that the charge of the contact net is equal to the sum of the charge of the carrier cable and the charge of the contact line, the contact net, the carrier cable and the contact line are equal to the ground potential, the sum of the two steel rails at each position of the upper row and the lower row is equal to the current of the combined steel rail, the ground potential of the two steel rails is equal to the ground potential of the combined steel rail, and the combined capacitance matrix can be obtained through a transformation formula (5) and is shown as a formula (6), namely a 6 x 6 order matrix.
In summary, the chain model of the traction network built by using MATLAB/Simulink is shown in FIG. 3, and the relevant parameters are calculated as:
and calculating the traction network lead parameters of the roadbed section by adopting a commonly used simplified Carson formula. Self-impedance Z of wire i in formula (3)iiAnd the mutual impedance Z of the wire i and the wire jijThe self-potential coefficient P of the wire i in the formula (6)iiThe mutual potential coefficient P of the wire i and the wire jijThe calculation expressions are shown in formula (7) and formula (8), respectively.
In formulae (7) and (8): mu.s0Is the magnetic permeability of vacuum (4 pi x 10)-7H/m); omega is angular frequency; ri is the radius of wire i; rεiIs the equivalent radius of wire i, and Rεi＝rie-μ/4(μ is the permeability of wire i); dijIs a conductive wire i and a conductive wireThe distance between j; dgFor the equivalent depth of the earth, the calculation formula is
(ρ is the earth resistivity; f is the frequency).
And for the traction network wire parameters of the tunnel section, calculating by adopting a Tylavsky formula based on a round tunnel model with infinite periphery. Self-impedance Z of wire i in formula (3)iiAnd the mutual impedance Z of the wire i and the wire jijThe self-potential coefficient P of the wire i in the formula (6)iiThe mutual potential coefficient P of the wire i and the wire jijThe calculation expressions are shown in formula (9) and formula (10), respectively.
In formulae (9) and (10): p is the complex depth in the ground,
(ω is angular frequency); r is the equivalent radius of the tunnel; biThe distance between the wire i and the equivalent circle center of the tunnel model is shown; bjThe distance between the wire j and the equivalent circle of the tunnel model is shown; theta is an included angle between the equivalent circle center of the tunnel model and the lead i and the lead j; r isiIs the radius of wire i; dijIs the distance between the conducting line i and the conducting line j.
The equivalent resistance per unit length, equivalent inductance and ground leakage conductance of the through ground line are calculated as equation (11).
In the formula, l is the length of the through ground wire; a is the radius of the conductor; ρ is the through ground resistivity; ρ' is the soil resistivity; h is the depth of the comprehensive through ground wire buried in the ground.
In addition, the feedthrough and return ground impedances shown in fig. 3 are set by modeling simulation of CDEGS software, and the initial results of the second extraction step are temporarily selected.
In the fourth step, on the premise of substituting the through ground wire grounding impedance and the return wire grounding electrode impedance extracted in the second step into the MATLAB/Simulink traction network chain model shown in FIG. 1, the earth return coefficient of the tunnel region is obtained through MATLAB/Simulink simulation, if the simulation result is different from the assumed earth return coefficient, the input and output excitation sources in the second step are adjusted according to the MATLAB/Simulink simulation result, the through ground wire grounding impedance and the return wire grounding impedance are recalculated through the MALZ engineering module, then the result recalculated by the MALZ engineering module is substituted into the MATLAB/Simulink chain model again, if the simulation result is still not matched with the excitation source set by CDEGS software, the above steps are repeated again, and the cycle iteration process is shown in FIG. 4. When the tunnel region earth reflux coefficient obtained by MATLAB/Simulink chain model simulation approaches the tunnel region earth reflux coefficient set in the corresponding second step, the through ground wire grounding impedance and the return wire grounding impedance corresponding to the chain model are considered as finally determined comprehensive grounding electrode impedance, and the detailed structure of the tunnel section comprehensive grounding system under power frequency can be accurately reflected.
The method and technical effects of the present invention are verified in detail by the following specific examples.
A short circuit test of the near-river spread substation is selected to carry out example research, the contact line is selected to be short-circuited to the steel rail in the test, the short circuit point is 14.51km away from the near-river spread substation, and the middle of the short circuit point passes through a hairiness hill tunnel of 6.711 km. Wherein the contact wire has a cross section of 150mm2The silver-copper alloy contact wire and the carrier cable have a cross section of 120mm2The copper alloy carrier cable adopts LBGLJ-185 type, tunnel IV level surrounding rock. The feeder voltage measured in the test is 12.61kV, the feeder current is 2425.37A, and the line impedance angle is 252.10 degrees, namely the short-circuit impedance amplitude and the phase angle are 5.1042 omega and 252.10 omega respectively。。
When the method is adopted to carry out example verification, the through ground wire and return wire ground electrode impedance of one comprehensive ground unit in the feather tunnel is only extracted by considering the factors that the feather tunnel relates to more comprehensive ground units, the limitation to the number of reinforcing steel bars in the modeling by utilizing an SESCAD tool, the time consumption of CDEGS software operation, almost the same resistance of the through ground wire and the return wire ground electrode of each comprehensive ground unit in the tunnel and the like. Then, with reference to the iterative flow of fig. 4, a traction network chain model is established that takes into account the line between the near-river spread substation and the short-circuit point, as shown in fig. 5. As the length of the hairiness mountain tunnel is 6.711km, the traction network chain model of the tunnel section is divided into 67 sub-modules, each sub-module is the traction network chain model corresponding to the unit comprehensive grounding unit, and the traction network chain model of the roadbed section adopts centralized parameter equivalence. Through iteration, finally determined through ground wire grounding electrode impedance and return wire grounding electrode impedance are substituted into the chain model, the waveforms of the feeder line voltage and the feeder line current are obtained through simulating the short circuit of the contact network to the steel rail, as shown in fig. 6, the amplitude and the phase angle of the short circuit impedance are 4.9716 omega and 254.03 degrees respectively, and the amplitude and the phase angle are close to the experimental test result.
Claims (4)
1. A traction network modeling method considering a tunnel section comprehensive grounding system structure is characterized by comprising the following steps:
step 1: analyzing an electrical structure of a comprehensive grounding system in a tunnel, establishing a tunnel internal traction reflux network model based on current distribution, an electromagnetic field, grounding and soil structure analysis software developed by Canada safety engineering technology company, namely CDEGS software according to an electrical topology formed by a through ground wire, a longitudinal grounding steel bar, an annular grounding steel bar, a bottom plate grounding network, a connecting steel bar, a transverse connecting line and mutual connection according to actual electrical arrangement, and setting an initial amount of tunnel region earth reflux coefficients;
step 2: setting an excitation source of the traction backflow network model in the tunnel built in the step 1, setting an input excitation source equal to an output excitation source, and extracting the earth electrode impedance at the connection part of the up-down through ground wire and the connecting reinforcing steel bar at every 100 meters in the tunnel and the earth electrode impedance at the connection part of the up-down backflow wire and the annular earthing reinforcing steel bar at every 35 meters in the tunnel; extracting the impedance of the grounding electrode of the comprehensive through ground wire by adopting a frequency domain grounding analysis module, namely an MALZ engineering module;
and step 3: carrying out electrical structure analysis on the traction network with the return line direct supply mode of the tunnel section, and building a corresponding chain model by adopting MATLAB/Simulink;
and 4, step 4: extracting the earth electrode impedance at each connecting point by adopting an MALZ engineering module, substituting the extracted earth electrode impedance into the chain model in the step 3, and obtaining the earth reflux coefficient of the tunnel region through simulation;
and 5: calculating relevant electrical parameters of contact networks, steel rails, return lines and through ground wires of the road base section and the tunnel section; the parameters of the roadbed section are calculated by adopting a simplified Carson formula, and the parameters of the tunnel section are calculated by adopting a Tylavsky formula;
step 6: and (3) comparing the earth reflux coefficient of the tunnel region obtained by simulation in the step (4) with the earth reflux coefficient reset by CDEGS software, judging whether the earth reflux coefficient of the tunnel region obtained by simulation of the MATLAB/Simulink chain model approaches the corresponding earth reflux coefficient of the tunnel region set in the step (1), if so, finishing the establishment of the traction reflux network model, otherwise, sequentially executing the step (2), the step (3) and the step (4) to form cycle iteration until the earth reflux coefficient of the tunnel region obtained by simulation of the MATLAB/Simulink chain model approaches the corresponding earth reflux coefficient of the tunnel region set in the step (1), and finally finishing the establishment of the traction reflux network model.
2. The traction network modeling method considering the tunnel section comprehensive grounding system structure according to claim 1, characterized in that when the excitation source is set in step 2, if the locomotive is located outside the tunnel, the traction return current outside the tunnel mouth relatively far away from the traction substation is set as an input excitation source, and the traction return current at the tunnel mouth relatively close to the location of the traction substation is set as an output excitation source; if the locomotive is positioned in the tunnel, the locomotive load current is set as an input excitation source, and the traction return current relatively close to the tunnel opening of the traction substation is set as an output excitation source.
3. The traction network modeling method considering the tunnel section comprehensive grounding system structure as claimed in claim 1, wherein the analyzing of the electrical structure of the tunnel comprehensive grounding system in step 1 specifically comprises:
according to the electrical connection structure section of the tunnel comprehensive grounding system with the return line direct supply mode, the up-down through ground wires are respectively connected with a longitudinal grounding steel bar at the corresponding position through a connecting steel bar every 100 meters, and the left longitudinal grounding steel bar and the right longitudinal grounding steel bar at the connecting point are disconnected; every other trolley distance, a grounding network formed by the bottom plate grounding electrode, the annular structural steel bars and other longitudinal grounding steel bars is connected with the longitudinal grounding steel bars at the through ground wire at the same position, and the return lines are connected with the annular structural steel bars at intervals of 35 meters; every 500 m, every reflow wire is connected with every other reflow wire.
4. The method as claimed in claim 1, wherein the traction network modeling method for the tunnel section comprehensive grounding system structure is applied,
the traction net chain model in the step 3 comprises parallel elements and series elements: the series elements as the parallel multi-conductor transmission lines are cut by the equipotential transverse connecting lines of the return network, the traction substation and the train parallel elements at intervals; the traction network model is divided into a plurality of series sub-network models according to the positions of the parallel elements, and each sub-network model comprises inductive coupling and capacitive coupling of parallel multi-conductor transmission lines.
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| CN109842092B (en) * | 2019-01-29 | 2020-04-21 | 中铁第四勘察设计院集团有限公司 | Power frequency short circuit safety evaluation method after traction substation interconnection comprehensive grounding system |
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