CN111324966B - CDEGS-based urban rail transit stray current simulation calculation method - Google Patents
CDEGS-based urban rail transit stray current simulation calculation method Download PDFInfo
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Abstract
The invention discloses a CDEGS-based simulation calculation method for urban rail transit stray current, which specifically comprises the following steps: according to the topological structure of the urban rail transit line, the structural topology of a simulation model of the urban rail transit leakage current is built by using CDEGS software, and based on parameters such as unit length resistance, rail system parameters, drainage system parameters, locomotive system parameters and traction substation parameters of a contact line, relevant parameters in the simulation model of the urban rail transit leakage circuit are set, and the simulation model of the urban rail transit leakage current is built; and simulating the model by CDEGS software to obtain the leakage current of the steel rail, and calculating the leakage current to obtain the stray current in the urban rail transit system. The method can accurately calculate the stray current in the urban rail transit, provides a basis for designing the protection measures of the stray current, and improves the running reliability of the urban rail transit.
Description
Technical Field
The invention belongs to the field of urban rail transit modeling, and particularly relates to a CDEGS-based urban rail transit stray current simulation calculation method.
Background
With the continuous development of the scale of urban rail transit, the problem of stray current in an urban rail transit system is also gradually emphasized. In an urban rail transit system, a traction substation supplies power to a contact network, a locomotive pantograph receives current from the contact network, a steel rail on which the locomotive runs is generally used as a return rail, and the current finally returns to the negative side of a rectifier unit. Because the resistance exists in the steel rail and the steel rail cannot be completely insulated from the ground, partial current leaks to the ground from the steel rail, and stray current is formed.
With the gradual complexity of urban rail transit operation lines, the dynamic change of power supply current and the gradual aging of steel rail-to-ground insulation, subway stray current also shows the trend of networking, persistence and superposition increase. Can adhere to filth thing on the insulating pad between rail and the insulating fastener and between rail and the railway roadbed, iron fillings that the rail friction can produce, dust and insulating pad can constantly age and so on these factors, can seriously influence the insulation between rail and the ground, lead to the rail to leak into the stray current quantity obvious increase in peripheral metallic conductor and the soil, a large amount of stray current will lead to the fact serious corrosion harm to rail, structural reinforcement, buried metal etc. along the subway station and tunnel. Stray current belongs to electrochemical corrosion to the corruption of structural reinforcement in metal steel rail and the tunnel, and is different with traditional mechanical wear, and electrochemical corrosion can destroy material metal property, and original unstable simple substance state will become more stable chemical combination state, and this process finally can lead to phenomena such as metal material appearance fracture, perforation. However, no effective method and means for measuring stray current in the urban rail transit system exist at present, so that protection against the stray current of the urban rail transit is blind and poor in effect. Therefore, a stray current calculation method is needed to be introduced under the condition that the stray current cannot be measured temporarily, and a guidance basis is provided for the protection of the stray current of the urban rail transit.
Disclosure of Invention
The invention aims to accurately simulate and calculate the stray current of the urban rail transit, can be used for analyzing and evaluating the distribution rule of the stray current in an urban rail transit system, and provides a basis for preventing and treating the corrosion of the underground metal structure of the urban rail transit.
Therefore, the invention provides a CDEGS-based urban rail transit stray current simulation calculation method, which comprises the following specific steps of:
step A: the basic parameters of the urban rail transit system are obtained according to the design drawing, the construction drawing and the operation maintenance test of the rail transit system, and the method specifically comprises the following steps: the method comprises the following steps of (1) determining the length of an urban rail transit line, the resistance of a contact line in unit length, rail system parameters, drainage system parameters, locomotive system parameters, traction substation parameters, the resistivity of soil and the resistivity of concrete;
the track system parameters comprise the cross section area of the steel rail, the unit length resistance of the steel rail, the distance between the steel rails, the transition resistance of the steel rail to the ground, the unit length resistance of the current equalizing line and the distance between two adjacent current equalizing lines; the drainage system parameters comprise the radius of the drainage network conductor, the longitudinal resistivity of the drainage network conductor and the number of the drainage network conductors; locomotive system parameters include the number of locomotives, the location of each locomotive and the amount of tractive current flow for each locomotive; the traction substation parameters comprise the position of the traction substation and the equivalent resistance value of the traction substation.
And B: a simulation model of urban rail transit leakage current is built in CDEGS software:
b1: setting soil into upper and lower double layers of soil by using a soil module in an MALZ module in CDEGS software, and defining an upper interface of the upper layer of soil as the ground; setting the thickness of the upper soil to be 0.6m and the resistivity of the upper soil to be the resistivity of the concrete obtained in the step A; and B, the lower soil is arranged below the upper soil, and the resistivity of the lower soil is the resistivity of the soil obtained in the step A.
B2: drawing a contact net system of L meters of round lead equivalent urban rail transit at 0.1 meter below the ground of the upper soil by using SesCAD in an MALZ module in CDEGS software, defining the lead as a contact lead, and arranging a completely insulated coating on the outer layer of the lead; setting the length L of the contact wire as the length of the urban rail transit line obtained in the step A; setting the resistance per unit length of the contact wire conductor as the resistance per unit length of the contact wire obtained in step a.
B3: drawing two L meters of round lead wires which are parallel to a contact wire lead respectively and are equivalent to steel rails of urban rail transit at a position 0.05 meter below the ground of the upper soil by utilizing a SesCAD tool in an MALZ module in CDEGS software, defining the lead wire as a steel rail lead, and arranging a coating with the thickness of 0.01 meter on the outer layer of the lead wire; the distances between the two steel rail conducting wires and the contact wire conducting wire are the same; setting the distance between two steel rail wires as the steel rail distance obtained in the step A, and equally dividing each steel rail wire into m sections; the unit length of the steel rail conductorB, setting the resistance as the resistance per unit length of the steel rail obtained in the step A; setting the radius of the steel rail wire as rTAnd is and
wherein S is the cross-sectional area of the steel rail obtained in the step A; setting the resistivity of the steel rail wire metal coating to ρtAnd is and
wherein R is the transition resistance of the steel rail obtained in the step A to the ground, and h is the thickness of the steel rail wire coating.
B4: drawing a W-meter round lead equivalent urban rail transit current equalizing line between two parallel steel rail leads of B3 at equal intervals by using a SesCAD tool in an MALZ module in CDEGS software, defining the lead as the current equalizing line lead, and arranging a completely insulated coating on the outer layer of the lead; setting the length W of each wire of the current equalizing line as the distance between the steel rails obtained in the step A; setting the resistance per unit length of each current-sharing line wire as the resistance per unit length of the current-sharing line obtained in the step A; and D, setting the distance between every two adjacent flow equalizing line wires as the distance between every two adjacent flow equalizing lines obtained in the step A.
B5: drawing three L-meter drainage nets equivalent to urban rail transit by circular leads which are parallel to steel rail leads respectively in a plane 0.35 meter below the ground of the upper soil by utilizing a SesCAD tool in an MALZ module in CDEGS software, and defining the leads as drainage net leads; every two drainage network conductors are arranged at a distance of 0.3m, and the middle drainage network conductor is arranged right below the steel rail conductor; setting the radius of each drainage network wire as rcRice, and rc＝nrp/6, wherein n, rpRespectively the number and the radius of the drainage network conductors obtained in the step A; setting the resistance per unit length of each drainage network wire to RcAnd is and
where ρ ispThe longitudinal resistivity of the drainage mesh conductor obtained in the step A.
B6: setting a current excitation on a contact wire lead at the position of each locomotive by using a system module in an MALZ module in CDEGS software, and setting the magnitude of the current excitation as the locomotive traction current magnitude obtained in the step A; meanwhile, two current excitations are respectively arranged on two steel rail wires at the position of each locomotive, and the magnitude of the two current excitations is set to be half of the locomotive traction current magnitude obtained in the step A.
B7: drawing two pieces with length of l at the position of each traction substation by using SesCAD tool in MALZ module in CDEGS softwareqThe round wires are respectively connected with two steel rail wires and contact wire wires, the wires are defined as traction substation wires, and a completely insulated coating is arranged on the outer layer of each wire; arranging two traction substation leads on the same plane vertical to the steel rail lead, wherein the connection points on the contact line lead are the same; setting the length l of each traction substation wireqIs composed of
Wherein d is the spacing between the steel rails; setting the resistance per unit length of each traction substation lead to RqAnd R isq＝2Rs/lqWherein R issAnd B, obtaining the equivalent resistance value of the station traction substation obtained in the step A.
And C: simulation calculation of stray current:
operating the simulation model of the urban rail transit leakage current built in the step B, and respectively obtaining the leakage current I of each section of the two steel rails1i、I2i(ii) a Where I is 1, 2, …, m, the stray current I at the ith segment point is calculatedSC,i：
ISC,i＝|I11+I21+I12+I22+…+I1i+I2i| (1)。
Compared with the prior art, the invention has the beneficial effects that:
firstly, a simulation model in the simulation calculation method is built mainly according to a metal conductor topological structure of an urban rail transit system by adopting an object-based modeling method. And simulating the model based on the accurate conductor distribution topology to obtain the leakage current of each section of steel rail lead. The simulation method can accurately reflect the current flow direction and current distribution in each part of the metal conductor structure.
And secondly, simulation model parameters of the simulation calculation method can be obtained through measurement and calculation in actual engineering, and compared with an analytic method, mutual conductance parameters among conductors do not need to be calculated, so that the model parameters are easier to obtain.
Drawings
FIG. 1 is a schematic view of a leakage current simulation model of an urban rail transit system in the method of the invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
The invention is applied to the urban rail transit system, and utilizes CDEGS software to carry out simulation calculation on stray current in the urban rail transit system, wherein a simulation model refers to FIG. 1.
A CDEGS-based urban rail transit stray current simulation calculation method specifically comprises the following steps:
step A: the basic parameters of the urban rail transit system are obtained according to the design drawing, the construction drawing and the operation maintenance test of the rail transit system, and the method specifically comprises the following steps: the method comprises the following steps of (1) determining the length of an urban rail transit line, the resistance of a contact line in unit length, rail system parameters, drainage system parameters, locomotive system parameters, traction substation parameters, the resistivity of soil and the resistivity of concrete;
the track system parameters comprise the cross section area of the steel rail, the unit length resistance of the steel rail, the distance between the steel rails, the transition resistance of the steel rail to the ground, the unit length resistance of the current equalizing line and the distance between two adjacent current equalizing lines; the drainage system parameters comprise the radius of the drainage network conductor, the longitudinal resistivity of the drainage network conductor and the number of the drainage network conductors; locomotive system parameters include the number of locomotives, the location of each locomotive and the amount of tractive current flow for each locomotive; the traction substation parameters comprise the position of the traction substation and the equivalent resistance value of the traction substation.
And B: a simulation model of urban rail transit leakage current is built in CDEGS software:
b1: setting soil into upper and lower double layers of soil by using a soil module in an MALZ module in CDEGS software, and defining an upper interface of the upper layer of soil as the ground; setting the thickness of the upper soil to be 0.6m and the resistivity of the upper soil to be the resistivity of the concrete obtained in the step A; and B, the lower soil is arranged below the upper soil, and the resistivity of the lower soil is the resistivity of the soil obtained in the step A.
B2: drawing a contact net system of L meters of round lead equivalent urban rail transit at 0.1 meter below the ground of the upper soil by using SesCAD in an MALZ module in CDEGS software, defining the lead as a contact lead, and arranging a completely insulated coating on the outer layer of the lead; setting the length L of the contact wire as the length of the urban rail transit line obtained in the step A; setting the resistance per unit length of the contact wire conductor as the resistance per unit length of the contact wire obtained in step a.
B3: drawing two L meters of round lead wires which are parallel to a contact wire lead respectively and are equivalent to steel rails of urban rail transit at a position 0.05 meter below the ground of the upper soil by utilizing a SesCAD tool in an MALZ module in CDEGS software, defining the lead wire as a steel rail lead, and arranging a coating with the thickness of 0.01 meter on the outer layer of the lead wire; the distances between the two steel rail conducting wires and the contact wire conducting wire are the same; setting the distance between two steel rail wires as the steel rail distance obtained in the step A, and equally dividing each steel rail wire into m sections; setting the resistance per unit length of the steel rail lead as the resistance per unit length of the steel rail obtained in the step A; setting the radius of the steel rail wire as rTAnd is and
wherein S is the cross-sectional area of the steel rail obtained in the step A; setting the resistivity of the steel rail wire metal coating to ρtAnd is and
wherein R is the transition resistance of the steel rail obtained in the step A to the ground, and h is the thickness of the steel rail wire coating.
B4: drawing a W-meter round lead equivalent urban rail transit current equalizing line between two parallel steel rail leads of B3 at equal intervals by using a SesCAD tool in an MALZ module in CDEGS software, defining the lead as the current equalizing line lead, and arranging a completely insulated coating on the outer layer of the lead; setting the length W of each wire of the current equalizing line as the distance between the steel rails obtained in the step A; setting the resistance per unit length of each current-sharing line wire as the resistance per unit length of the current-sharing line obtained in the step A; and D, setting the distance between every two adjacent flow equalizing line wires as the distance between every two adjacent flow equalizing lines obtained in the step A.
B5: drawing three L-meter drainage nets equivalent to urban rail transit by circular leads which are parallel to steel rail leads respectively in a plane 0.35 meter below the ground of the upper soil by utilizing a SesCAD tool in an MALZ module in CDEGS software, and defining the leads as drainage net leads; every two drainage network conductors are arranged at a distance of 0.3m, and the middle drainage network conductor is arranged right below the steel rail conductor; setting the radius of each drainage network wire as rcRice, and rc＝nrp/6, wherein n, rpRespectively the number and the radius of the drainage network conductors obtained in the step A; setting the resistance per unit length of each drainage network wire to RcAnd is and
where ρ ispThe longitudinal resistivity of the drainage mesh conductor obtained in the step A.
B6: setting a current excitation on a contact wire lead at the position of each locomotive by using a system module in an MALZ module in CDEGS software, and setting the magnitude of the current excitation as the locomotive traction current magnitude obtained in the step A; meanwhile, two current excitations are respectively arranged on two steel rail wires at the position of each locomotive, and the magnitude of the two current excitations is set to be half of the locomotive traction current magnitude obtained in the step A.
B7: drawing two pieces with length of l at the position of each traction substation by using SesCAD tool in MALZ module in CDEGS softwareqRound wire respectively connected with two steel rail wires and contact wireDefining the lead as a traction substation lead, and arranging a completely insulated coating on the outer layer of the lead; arranging two traction substation leads on the same plane vertical to the steel rail lead, wherein the connection points on the contact line lead are the same; setting the length l of each traction substation wireqIs composed of
Wherein d is the spacing between the steel rails; setting the resistance per unit length of each traction substation lead to RqAnd R isq＝2Rs/lqWherein R issAnd B, obtaining the equivalent resistance value of the station traction substation obtained in the step A.
And C: simulation calculation of stray current:
operating the simulation model of the urban rail transit leakage current built in the step B, and respectively obtaining the leakage current I of each section of the two steel rails1i、I2i(ii) a Where I is 1, 2, …, m, the stray current I at the ith segment point is calculatedSC,i：
ISC,i＝|I11+I21+I12+I22+…+I1i+I2i| (1)。
Claims (1)
1. CDEGS-based urban rail transit stray current simulation calculation method is characterized by comprising the following steps:
step A: the basic parameters of the urban rail transit system are obtained according to the design drawing, the construction drawing and the operation maintenance test of the rail transit system, and the method specifically comprises the following steps: the method comprises the following steps of (1) determining the length of an urban rail transit line, the resistance of a contact line in unit length, rail system parameters, drainage system parameters, locomotive system parameters, traction substation parameters, the resistivity of soil and the resistivity of concrete;
the track system parameters comprise the cross section area of the steel rail, the unit length resistance of the steel rail, the distance between the steel rails, the transition resistance of the steel rail to the ground, the unit length resistance of the current equalizing line and the distance between two adjacent current equalizing lines;
the drainage system parameters comprise the radius of the drainage network conductor, the longitudinal resistivity of the drainage network conductor and the number of the drainage network conductors;
the locomotive system parameters include a number of locomotives, a location of each locomotive, and an amount of tractive current for each locomotive;
the traction substation parameters comprise the position of the traction substation and the equivalent resistance value of the traction substation;
and B: a simulation model of urban rail transit leakage current is built in CDEGS software:
b1: setting soil into upper and lower double layers of soil by using a soil module in an MALZ module in CDEGS software, and defining an upper interface of the upper layer of soil as the ground; setting the thickness of the upper soil to be 0.6m and the resistivity of the upper soil to be the resistivity of the concrete obtained in the step A; b, the lower layer soil is arranged below the upper layer soil, and the resistivity of the lower layer soil is the resistivity of the soil obtained in the step A;
b2: drawing a contact net system of L meters of round lead equivalent urban rail transit at 0.1 meter below the ground of the upper soil by using SesCAD in an MALZ module in CDEGS software, defining the lead as a contact lead, and arranging a completely insulated coating on the outer layer of the lead; setting the length L of the contact wire as the length of the urban rail transit line obtained in the step A; setting the resistance per unit length of the contact wire and the lead as the resistance per unit length of the contact wire obtained in the step A;
b3: drawing two L meters of round lead wires which are parallel to a contact wire lead respectively and are equivalent to steel rails of urban rail transit at a position 0.05 meter below the ground of the upper soil by utilizing a SesCAD tool in an MALZ module in CDEGS software, defining the lead wire as a steel rail lead, and arranging a coating with the thickness of 0.01 meter on the outer layer of the lead wire; the distances between the two steel rail conducting wires and the contact wire conducting wire are the same; setting the distance between two steel rail wires as the steel rail distance obtained in the step A, and equally dividing each steel rail wire into m sections; setting the resistance per unit length of the steel rail lead as the resistance per unit length of the steel rail obtained in the step A; setting the radius of the steel rail wire as rTAnd is and
wherein S is the cross-sectional area of the steel rail obtained in the step A; setting the resistivity of the steel rail wire metal coating to ρtAnd is and
wherein R is the transition resistance of the steel rail obtained in the step A to the ground, and h is the thickness of the steel rail wire coating;
b4: drawing a W-meter round lead equivalent urban rail transit current equalizing line between two parallel steel rail leads of B3 at equal intervals by using a SesCAD tool in an MALZ module in CDEGS software, defining the lead as the current equalizing line lead, and arranging a completely insulated coating on the outer layer of the lead; setting the length W of each wire of the current equalizing line as the distance between the steel rails obtained in the step A; setting the resistance per unit length of each current-sharing line wire as the resistance per unit length of the current-sharing line obtained in the step A; setting the distance between two adjacent wire equalizing lines as the distance between two adjacent wire equalizing lines obtained in the step A;
b5: drawing three L-meter drainage nets equivalent to urban rail transit by circular leads which are parallel to steel rail leads respectively in a plane 0.35 meter below the ground of the upper soil by utilizing a SesCAD tool in an MALZ module in CDEGS software, and defining the leads as drainage net leads; every two drainage network conductors are arranged at a distance of 0.3m, and the middle drainage network conductor is arranged right below the steel rail conductor; setting the radius of each drainage network wire as rcRice, and rc＝nrp/6, wherein n, rpRespectively the number and the radius of the drainage network conductors obtained in the step A; setting the resistance per unit length of each drainage network wire to RcAnd is and
where ρ ispThe longitudinal resistivity of the drainage mesh conductor obtained in the step A is obtained;
b6: setting a current excitation on a contact wire lead at the position of each locomotive by using a system module in an MALZ module in CDEGS software, and setting the magnitude of the current excitation as the locomotive traction current magnitude obtained in the step A; simultaneously, respectively setting a current excitation on two steel rail wires at the position of each locomotive, and setting the magnitude of the two current excitations as half of the locomotive traction current magnitude obtained in the step A;
b7: drawing two pieces with length of l at the position of each traction substation by using SesCAD tool in MALZ module in CDEGS softwareqThe round wires are respectively connected with two steel rail wires and contact wire wires, the wires are defined as traction substation wires, and a completely insulated coating is arranged on the outer layer of each wire; arranging two traction substation leads on the same plane vertical to the steel rail lead, wherein the connection points on the contact line lead are the same; setting the length l of each traction substation wireqIs composed of
Wherein d is the spacing between the steel rails; setting the resistance per unit length of each traction substation lead to RqAnd R isq＝2Rs/lqWherein R issB, obtaining an equivalent resistance value of the station traction substation obtained in the step A;
and C: simulation calculation of stray current:
operating the simulation model of the urban rail transit leakage current built in the step B, and respectively obtaining the leakage current I of each section of the two steel rails1i、I2iWhere I is 1, 2, …, m, the stray current I at the ith segment point is calculatedSC,i：
ISC,i＝|I11+I21+I12+I22+…+I1i+I2i| (1)。
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| CN112632740B (en) * | 2020-09-30 | 2024-02-13 | 南方电网科学研究院有限责任公司 | Surface potential measurement method based on stray current model |
| CN112329211A (en) * | 2020-10-19 | 2021-02-05 | 南方电网科学研究院有限责任公司 | Urban railway conductor section leakage current simulation measurement method based on CDEGS |
| CN112836364B (en) * | 2021-01-27 | 2022-08-19 | 西南交通大学 | Unified calculation method for stray current of urban rail transit |
| CN112960015B (en) * | 2021-02-05 | 2022-05-06 | 北京交通大学 | Steel rail potential limiting method and device based on digital twinning technology |
| CN114707351B (en) * | 2022-04-25 | 2023-03-14 | 西南交通大学 | Subway transfer station grounding grid equivalent method suitable for CDEGS simulation |
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