A 25 kVA transformer is an important part of your electrical system. To make it last longer, follow a few simple steps. First, keep it clean and dry. Dust and moisture can damage it. Second, check the oil level and quality regularly if it’s an oil-filled transformer. Third, avoid overloading it. Too much load can cause overheating. Fourth, make sure all connections are tight and in good condition. Loose wires can lead to faults. Lastly, get it inspected by a professional from time to time.