A simulation test method for quick-disconnection setting of high-voltage power grid in mixed structure mine
An inspection method and technology for high-voltage power grids, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as skipping trips
Inactive Publication Date: 2019-01-11
HENAN POLYTECHNIC UNIV
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[0003] Under normal circumstances, in the mine high-voltage power grid, the adjacent outgoing line switches are drawn from the busbar behind the incoming line switch, but this wiring method will lead to a large number of power supply stages in the coal mine, and it is easy to lead to skipping when a short circuit fault occurs Tripping phenomenon, in order to reduce the number of power supply stages of the high-voltage power supply system in coal mines, a mixed-structure coal mine high-voltage power supply system including T-shaped structure and general structure is adopted in some coal mines, so as to effectively limit the number of power supply stages of the high-voltage power supply system in coal mines
[0004] The literature "Simulation and inspection method of quick-disconnection setting of mine high-voltage power grid based on correlation matrix" is aimed at completing the simulation inspection of quick-disconnection setting for high-voltage power supply systems in coal mines under normal circumstances. No report
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[0057] attached figure 1 And attached figure 2 The branch nodes filled in black are in the open state, and the unfilled branch nodes are in the closed state; figure 1 And attached figure 2 In the mine high-voltage power supply system, the power supply branch nodes are (1), (2), (3) and (4).
[0058] against attached figure 1 The mine high-voltage power supply system generates correlation matrix A, correlation matrix B, correlation matrix D, correlation matrix E and correlation matrix TE; the specific steps are as follows:
[0059] (1) Generate an incidence matrix A, ;
[0060] (2) Generate an incidence matrix B, ;
[0061] (3) Generate an incidence matrix D, ;
[0062] (4) Generate an incidence matrix E, ;
[0063] (5) Generate an incidence matrix TE, .
[0064] Calculate the final power supply correlation matrix of the main road node and the branch road node according to the correlation matrix A and B , the specific calculation steps are as follows:
[...
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The invention discloses a quick-break setting simulation verification method for a mixed-structure mine high-voltage power grid, and the method comprises the steps: calculating an incidence matrix TH, an incidence matrix NH and an incidence matrix G according to the connectivity of a single-direction graph; obtaining a branch node set T with the instantaneous quick-break fixed value being less than a fault current according to the incidence matrix NH and the incidence matrix G; obtaining a set X of all switches which need to be switched off because of a short-circuit fault according to the node set T, and switching off the corresponding switch according to the obtained set X, and carrying out the tripping operation. According to the characteristics of a power supply system of the mixed-structure mine high-voltage power grid, a corresponding network topology model is built, and the topology recognition of the mixed-structure mine high-voltage power grid can be completed conveniently. Based on the above, the set of switches which need to be switched off because of the short-circuit fault is obtained, so as to verify whether the current quick-break setting meet the requirements of reliability and selectivity or not, and achieve the purpose of quick-break setting simulation verification.
Description
technical field [0001] The invention discloses a simulation test method for quick-break setting of a high-voltage power grid in a mixed structure mine, and belongs to the field of simulation test of relay protection of a high-voltage power grid in coal mines. Background technique [0002] There are multiple power sources in the power grid above 35kV, which belongs to the complex closed power grid, and the fault calculation and simulation test for the quick-break setting are relatively complicated; while the mine high-voltage power grid is 6kV or 10kV, the two power sources should be operated separately, or One way is used and one way is reserved, which belongs to the single power supply open grid. [0003] Under normal circumstances, in the mine high-voltage power grid, the adjacent outgoing line switches are drawn from the busbar behind the incoming line switch, but this wiring method will lead to a large number of power supply stages in the coal mine, and it is easy to lea...
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 王新良石峰刘志怀吴君黄青改张博梁策
Owner HENAN POLYTECHNIC UNIV