The fuse is a piece of wire which can carry a stated current; if the current rises above this value it will melt. If the fuse melts (blows) then there is an open circuit and no cur... Read more
Occasionally a transformer winding becomes completely shorted. In most cases, this activates the overcurrent-protective device (circuit breaker or fuse) and de-energizes the circui... Read more
Sometimes a few turns in the secondary winding of a transformer experience a partial short, which in turn causes a voltage drop across the secondary. The usual symptom of this cond... Read more
Dry-type transformers are a part of most electrical installations. They range in size from small doorbell transformers to three-phase 25-kVA units installed in electrical closets t... Read more
The performance of a 3-phase generator at the terminals is based on the 3-phase power fundamentals. The generator typically supplies power to more than one load, some of which may... Read more
Lockout/tagout energy sources When electrical systems are de-energized to perform maintenance work safely, precautions must be taken to insure that circuits are not accidentally tu... Read more
When ship electrical equipment is regularly monitored and tested. Then monitoring indicates that a breakdown is imminent, the equipment is repaired or replaced and any other specif... Read more
When equipment is regularly inspected and maintained according to a manufacturer’s timetable and described procedures that specify the actual work to be done to prevent equipment f... Read more
This is when equipment is left untouched until a breakdown occurs. At this time, the equipment is repaired or replaced and any other specified maintenance procedure carried out. Th... Read more
Power currents (AC) can be measured simply by using a clampmeter that acts as a current transformer. The instrument’s tongs are clipped round a single insulated conductor and the c... Read more
