Mine's power grid electric leakage identification method based on the real component of the fault instantaneous positive sequence current

Abstract

The invention discloses a mine's power grid electric leakage identification method based on the real component of the fault instantaneous positive sequence current. The method comprises the following steps: 1) obtaining, saving and synchronously updating the electric leakage signals; 2) receiving, analyzing and processing the electric leakage signals; 3) determining whether a power grid electric leakage occurs or not; 4) determining whether a power grid trunk electric leakage occurs or not; 5) protecting the power grid trunk electric leakage and outputting a power grid trunk electric leakage result; and 6) identifying the power grid electric leakage branch line, outputting the result, and protecting the power grid electric leakage branch lines. The invention is novel in design, and the phase sum mode value of the zero sequence current is used to determine the power leakage faults in trunk or branch line, which can overcome the problem that in the traditional leakage detection method, trunk fault can not be separated from the branch line fault. Through the amplitude of the real component of the fault instantaneous positive sequence current to tell a power grid electric leakage branch line, an obvious effect can be achieved for line selecting. In addition, the line selecting method is also very self-adaptive.

Description

technical field [0001] The invention belongs to the technical field of mine low-voltage power grid leakage protection, and in particular relates to a mine power grid leakage identification method based on real component components of fault instantaneous positive sequence current. Background technique [0002] Currently, leakage faults are one of the most common leakage faults in mine low-voltage power grids (380V, 660V, 1140V), accounting for about 70% of the total leakage faults. Electricity leakage will generate electric sparks, if not dealt with in time, it will cause gas and coal dust explosion, causing immeasurable consequences to personal and production safety. "Coal Mine Safety Regulations" stipulates: "A leak detection protection device with a leakage lock should be installed on the low-voltage feeder of the mine. When the leakage detection device shows that a leakage occurs or the insulation level of the system is lowered, the power supply must be cut off immediatel...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a mine power grid leakage identification method based on the real component of fault instantaneous positive sequence current, which is novel and reasonable in design, and adopts the phasor sum of zero sequence current. The modulus judges the leakage fault of the main line or the branch line, which overcomes the problem that the traditional leakage selection method cannot distinguish the fault of the main line and the branch line, and identifies the leakage branch line of the power grid through the amplitude of the real part of the instantaneous positive sequence current of the branch line leakage fault, and the line selection effect is obvious, and The line selection method is highly adaptive

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