Method for searching for 10kV power grid grounding based on six-sigma tool

Abstract

The invention relates to a method for searching for 10kV power grid grounding based on a six-sigma tool and belongs to the field of power grid running. The method comprises the following steps of: establishing a line database, namely, listing and arraying all branches on a bus bar of an independent 10kV power grid, surveying and filling performance data; establishing a causality matrix, assessing and rating, and sorting; and performing grounding searching operation. According to the method provided by the invention, the six-sigma tool is adopted; a switching sequence table is established on the basis of the data; the hit rate of searching grounding can be increased by using the switching sequence table; the searching time is shortened; the safety running of a power supply system is recovered as soon as possible; and the normal production is ensured.

Description

technical field [0001] The invention belongs to the field of power grid operation, and relates to the technology and operation method of power grid dispatching to find grounding faults, and relates to the quality improvement and analysis method of Six Sigma management and the application of related tools. Background technique [0002] The 10kV electric power supply system of large and medium-sized iron and steel complexes is the main power supply network, and the small current grounding system grounded by the arc suppression coil also occupies a certain proportion. The neutral point is grounded through the arc suppressing coil, which compensates the capacitive current at the grounding point, reduces the residual current, achieves arc extinguishing, and prevents the expansion of accidents. This grounding method cannot achieve zero-sequence protection tripping to cut off the faulty line, and allows two hours of grounding operation. Usually, a small current grounding line selec...