Introduction: Electricity has become an essential element of the infrastructure of contemporary society. Planning the strategies to maintain system reliability is a key task for network operators in order to ensure that the frequency and duration of outage experienced by their customers are within the targets imposed by both Energy Regulators (ERs) and Security of Supply (SoS) necessities. But internal inspection and maintenance outages interrupt power supply to the customers and require an alternate transformer to take loads. Failure due to vegetation, ageing, excessive load, lack of maintenance, earthquake or weather conditions, may seriously affect the power networks.

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