Assessment of power grid elements technical condition using the example of a transformer State National Research Polytechnic University of Perm Anastasiia Suslova

Objectives The aim is to develop diagnostic algorithmic support of electrical equipment, which allows: –Follow up the technical condition level of the electrical equipment promptly and accurately; –Predict changes in the technical condition level of electrical equipment; –Influence the technical condition level of electrical equipment to maintain it at a specified value.

Reliability centered maintenance

Algorithm for power equipment diagnosing Start Key factors define Design of experiment (full factorial design, fractional factorial design) 1 Equipment monitoring, parameters measurement in accordance with experiment design Developing a model 2 1 End 2 Acceptable reliability level ? Making decision on equipment repair or replacement No Yes

Factors influencing transformer reliability - oil level in the tank (m), - temperature of the upper layers of oil (° C), - indicator silica gel condition, - heating of contacts (° C), - vibration (Hz), - level of voltage (kV).

Factors levels

Matrix for fractional factorial experiment

Linear model of a transformer

Technical condition level

Results The suggested algorithm allows to solve main tasks of diagnostics assessment of the actual power equipment condition; deciding if the operation and repairs performed are correct; forecasting technical condition; define what repairs should be done; maintaining specified reliability level; reducing maintenance and repair costs.

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