This ABB repair manual provides safety guidelines, fault analysis, and step‑by‑step procedures for servicing the UZE/UZF load tap switch with BUF3 motor…
The manual outlines the safety precautions that must be observed before any repair work, including de‑energising the transformer, grounding, and obtaining a signed work permit. It also details the handling of oil, required protective equipment, and the importance of using only ABB‑approved spare parts.
Detailed fault analysis sections cover the load tap switch, pressure relay, and motor mechanism, followed by repair and commissioning procedures such as seal‑gasket replacement, front‑cover gasket change, limit‑adjustment, contact replacement, and pressure‑relay replacement. Torque specifications, required tools, and material lists are provided to ensure correct re‑assembly. This manual is written in Chinese.
The transformer must be de‑energised, reliably grounded, and a work permit signed by a supervising engineer must be obtained.
Clean the sealing surfaces, alternate tightening the radial bolts with a low initial torque, then tighten to the final torque specified in section 1.6.
At least three hours at atmospheric pressure to allow gas bubbles to dissipate.
Protective gloves should be worn to avoid direct contact with the oil.