From the power system perspective, equipment faults and failures do occur frequently. Many fault and failure events do not even impact system operation – however, some events do cause undesired and sometimes incomprehensible impacts. Especially for multiple faults, the actual root causes, or even the observed events in system operation, are not easily understood. In these cases knowledge of different specialists has to be coordinated, e.g. on protection, insulation coordination, system dynamics, power system operation, equipment of different vendors. It is also necessary to consider post failure conditions, events and operational procedures and to cross check official statements.
Site investigation and measurements
Data verification may include site visits, interviews, analysis of reference events, and measurements on-site or in a laboratory. The analysis is backed and supported by state-of-the-art, calibrated measuring devices.
Modeling and simulation
Based on the theoretical analyses, a draft hypothesis on the disturbance event is developed. By modeling the steady state, dynamic and transient behavior of equipment and of systems in appropriate detail it is possible to verify the root cause and to validate proposed mitigation measures.
A disturbance investigation reveals the causes for undesired or incomprehensible issues in system operation. On this basis suitable mitigation measures are defined which help to prevent future system outages.
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