Number of wires on ship power system Modem merchant vessels usually use alternating current systems classified as three-phase three-wire insulated neutral systems, of three-phase f... Read more
Another special version is the VDR resistor i.e. (Voltage Dependable Resistor). It is made of sintered silicium carbide, a material with the property that its resistance changes ac... Read more
Besides the ordinary resistors we have been looking at so far there are also resistors with quite special properties. We are not going to bury ourselves in their characteristics bu... Read more
Being an ETO on a super yacht is one of the most exciting jobs in the world. Not only do we get to learn about cutting-edge audio visual, IT, electrical and bridge navigation syste... Read more
What are some general safety tips for working with or near electricity? Inspect portable cord-and-plug connected equipment, extension cords, power bars, and electrical fittings for... Read more
As you will have gathered, maintenance of cage-rotor induction motors tends to mainly involve the stator windings and bearings. Cage-rotors require little or no special care in nor... Read more
Induction motors are fitted with ball and or roller bearings. These bearings are robust and reliable and should give very little trouble provided they are properly fitted, kept abs... Read more
When the 3-phase a.c. supply voltages are connected to the three stator phase windings, the resulting phase currents produce a multi-pole magnetic flux. This flux is physically rot... Read more
LV generator circuit-breakers and other large distribution circuit-breakers (600-6000 A) on board ship are traditionally of the air break type called ACB (air circuit breaker). Thi... Read more
A ship shore-supply is required so that the ship’s generators and their prime-movers can be shut down for major overhaul during a dry-docking period. There must be a suitable... Read more
