| Based on the emperor Lake Zone in Anji County, three long-term by voltage sag produced by the electric companies, the sensitive equipment to conduct investigation and analysis, and by the power plant receiving end bus voltage voltage monitoring year, compared to fault information data control centers, analyzes major causes county grid voltage sags, draw a line fault causes of the county Department of 10kV outlet grid voltage sag at higher frequencies occur frequently, causing the voltage on the bus occurred many times temporarily drop, and such is the magnitude of the voltage sag is generally less than 40%. By combining the power company rural power grids project, carried out qualifying 10kV substation transformation insulated, insulated wires bare wires alternative to improve the insulation level line, reducing the chance of short-circuit faults. Three plants in the electricity sector under the recommendation of the low voltage power system has been modified, with a DVR device to sensitive equipment protected manner, so as to achieve the purpose of voltage sags governance by real events sag test, verification governance program completely to meet the requirements. |
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