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13. Maintenance
Electric shock!
An energized transformer may cause death or serious injury.
►Turn off the high voltage and low voltage ends of the transformer.
►Lock the transformer to prevent accidental restart.
►Ensure that all components are powered off.
►Clearly ground all transformer terminals (ground wire, ground isolation switch)
and short-circuit them.
►Cover or isolate adjacent live parts.
Electric shock!
Operation of energized on-load tap-changers may cause personnel death or serious
injury.
►Disconnect all auxiliary circuits, such as tap change monitoring devices, pressure
relief valves and pressure monitors.
►Ensure that all components are powered off.
Warning!
Risk of explosion!
Explosive gas in the oil compartment of the on-load tap-changer, transformer, piping
system, oil conservator, and the outlet of the moisture absorber may ignite or
explode, causing serious injury or death.
►Ensure that there are no open flames, hot surfaces, or electric sparks (for example,
electric sparks caused by static electricity accumulation) in the environment around
the transformer, and that the above situations will not occur.
►Do not operate any electrical equipment (for example, impact wrenches have the
risk of sparking).
►Only use conductive and grounded hoses, pipes and pump operation equipment
suitable for flammable liquids.
Check the motor drive unit!
Condensation in the MDU protection case can cause damage to MDU.
►Always keep MDU's protection case sealed.
►If the operation is interrupted for more than 2 weeks, connect and operate the anti-
condensation heater in the MDU. If this requirement cannot be met (for example, the heater
cannot be energized during transportation), a sufficient amount of desiccant must be placed
inside the case.
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