Performance assessment of aged HV equipment and substations in Thailand transmission network for renovation planning

Nowadays, a large number of high voltage substations is now reaching end of lifetime. To renovate these aged substations, it requires a high capital investment from the utility. Then, the performance assessment of aged high voltage substations in Thailand transmission network is proposed. The performance assessment procedure has been firstly setup based on technical and economic considerations of aged high voltage equipment such as power circuit breaker, disconnecting switch, instrument transformer, and surge arrester. To evaluate the equipment performance, six criteria have been defined consisting of age, electrical stress, symptom or sign of failure, failed type, obsolescence as well as environmental and safety impacts. The equipment performance evaluation is developed by applying the…