What type of maintenance is typically performed on transformers in substations?

Preventive maintenance is essential for transformers in substations because it focuses on routine checks, tests, and inspections conducted at regular intervals to prevent potential failures before they occur. This type of maintenance includes activities such as thermal imaging, insulation resistance tests, and connections checks, which help identify any underlying issues that could lead to problems if left unaddressed.

By engaging in preventive maintenance, technicians ensure the reliability and longevity of the transformer. It helps in maintaining optimal performance and compliance with safety standards. The proactive approach of preventive maintenance ultimately reduces the risk of unexpected failures, ensures consistent operation, and minimizes downtime, leading to greater operational efficiency in the substation.

The other methods of maintenance may address certain aspects of transformer care but do not focus as effectively on the prevention of issues through routine practices. Reactive maintenance is dependent on immediate repairs and may lead to downtime; predictive maintenance, while valuable, requires advanced tools and techniques that may not be applicable in all scenarios; and corrective maintenance occurs only after a failure, which can be disruptive and costly.