Stray current distribution acquisition method of subway car depot
A subway depot, stray current technology, applied in the direction of measuring only current, measuring current/voltage, measuring electrical variables, etc., can solve the problem of depot rails, surrounding buried metal corrosion, lack of depot stray current distribution calculation research , economic losses and safety hazards, etc., to achieve the effects of high model utilization, excellent reference value, and good economic benefits
Active Publication Date: 2020-02-07
SOUTHWEST JIAOTONG UNIV
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AI Technical Summary
Problems solved by technology
Causes a large amount of stray currents in the depot to adversely affect the depot
It is not difficult to predict that over the years, stray currents of this magnitude will cause serious corrosion of the rails in the depot and the surrounding buried metal, which will reduce the service life of the depot and cause serious economic losses and safety hazards
At present, there is still a lack of computational research on the distribution of stray currents in depots
Method used
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[0067] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0068] Such as figure 1 As shown, a method for obtaining stray current distribution in a subway depot includes the following steps:
[0069] Step 1: Obtain the distribution of the traction return structure of the depot, record the relevant electrical parameters of the traction return flow of the depot, and monitor and obtain the traction working conditions to be solved;
[0070] Step 1 process is as follows:
[0071] S11: Treat the depot as a rectangular plane area, and divide it equally into M rows and N columns of square sub-areas Q(m, n), where m and n are the row numbers and column numbers of the square sub-areas; m=1,2,3 , ..., M; n=1, 2, 3, ..., N; the side length of each square sub-area obtained after division is L.
[0072] S12: Use the rail distribution matrix B to represent the distribution of the reflowed rails; if the sub-area Q(...
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The invention discloses a stray current distribution acquisition method of subway car depot. The stray current distribution acquisition method comprises the following steps of 1, acquiring a distribution condition of a car depot traction return-current structure, recording a relevant electrical parameter of a car depot traction return current, and monitoring and acquiring a to-be-solved traction working condition; 2, building a conductance relation model of a car depot return-current circuit; 3, building a current injection relation model, and calculating to obtain a ground potential distribution matrix after assignment; and 4, processing the ground potential distribution matrix according to numerical value gradient calculation function operation, and calculating stray current distributionof the subway car depot. By the method, a basis is provided for stray current protection design, construction and maintenance of the subway DC car depot.
Description
technical field [0001] The invention relates to an urban rail transit DC traction power supply system, in particular to a method for acquiring stray current distribution in a subway depot. Background technique [0002] The power supply system of urban rail transit in my country generally adopts the DC traction power supply method. The locomotive obtains electric energy from the traction substation through the catenary, and the DC traction current returns to the negative pole of the traction substation through the rail. In actual engineering, the rail cannot be completely insulated from the ground, and part of the current leaks to the ground and surrounding conductors during the return process, resulting in a current distributed outside the preset return path, that is, stray current. Stray current not only corrodes the structural facilities of the urban rail transit system itself, but also corrodes nearby buried metal pipelines, thus causing potential safety hazards. [0003...
Claims
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IPC IPC(8): G01R19/00
CPCG01R19/0092
Inventor 林圣皇甫阳周奇王爱民
Owner SOUTHWEST JIAOTONG UNIV