The Lean Closed Loop Management of Transformer Operation in Low Voltage Distribution Network

The management of the distribution network transformers' operation (DNTO) has become a popular and efficient way for the power grid companies to enhance the efficiency of operation. However, the current method which is measured by a single index, is impossible to effectively and scientifically measure the DNTO and guide the management of the DNTO. In the management of the DNTO, the lean closed-loop management method is useful, but there are some key issues to be solved. This paper first proposes a multiindex system to define the DNTO to solve the first issue, which is the one-sidedness of a single index. Then the improved fuzzy comprehensive evaluation constructing by the triangular fuzzy number (TFN) and the relative similarity relation (RSR) is proposed to overall measure the DNTO for the second issue, which is the one-sidedness of a single comprehensive method. Besides, the relations among evaluation indexes are mined from related indexes to build the critical reference value (CRE) for the third issue, which is the current method can not find the defects of the DNTO. And, the Six Sigma management strategy is adopted to optimize the management process of the DNTO and form effective closed-loop management. Finally, both case studies are conducted to demonstrate that the proposed methods are effective.