Analysis of Power Outages and Human errors in the Operation of Equipment in Power Grids

The continuous development of the power systems by implementing new technologies for management and connection of new sources of electricity requires improvement of the power supply security. The present work is dedicated to analysis of the causes of power outages in the medium and high voltage power grids on the territory of the Republic of Bulgaria. The main types and places of occurring power outages in power lines, substations and power transformers have been analyzed and the causes for them are summarized. Indicators for assessment of the power outages related to power lines and substations are presented. Measures to improve the technical condition of high voltage power lines, substations and medium voltage switchgear are proposed. The power outages due to human errors of the service personnel in the power grids have been considered and measures to prevent such accidents depending on their objectivity and subjectivity are proposed.