A 50kVA oil distribution transformer is a sealed power conversion device consisting of a high-permeability silicon steel core and multi-layer copper windings. The SGOB (Separated by Obstacles and Obstacles) features a fully enclosed, oil-conservation-free design, permanently isolating the transformer oil from the external environment. A nitrogen blanket covers the oil surface, blocking oxygen and UV intrusion. The insulation system utilizes an oil-paper composite dielectric, and the electric field distribution is computer-optimized. Fasteners feature multiple anti-loosening measures to eliminate the risk of displacement under mechanical vibration.
Replace the silicone sealant in the 50kVA oil distribution transformer when it discolors by more than two-thirds. The new silicone sealant must be vacuum-dehydrated. Unpack and inspect the core ground current every five years, and remove the clamps to measure insulation resistance. Replace the special grease for the oil pump bearings every three years, and clean the oil lines for residual impurities before greasing.
How to verify product seal integrity? Record the expander displacement scale monthly and perform a pressure hold test if abnormal contraction occurs. Scan the flange joints with a halogen leak detector; sudden changes in the detector reading indicate micro-leaks. If an abnormal nitrogen-oxygen ratio is detected in the oil chromatographic analysis, initiate the vacuum decay test procedure.
Immediately perform a DC resistance test to compare the phase-to-phase difference. Check the radial displacement of the windings by suspending the core, and verify the geometric dimensions using a laser rangefinder. Monitor the abnormal vibration spectrum of the 50kVA oil distribution transformer during a no-load test. If the core is grounded at multiple points, disassemble and inspect the insulation clamps.
