Operate Alternators, Generators. Test 13

Name the three conditions which must prevail to parallel one alternator with another?

When taking over the engine room watch, what should you verify on the electrical main switch board ?

The alternator on load, voltage, amperage, power supply, frequency.
The setting of the non-essential consumer trip system, the setting of the overload system, the actual power as percentage of total capacity available.
Power Generation, power distribution inclusive secondary circuit, any unusual power consumer switched on/off, earth faults main and secondary systems.
The voltage and amperage delivered to the power consumers, the condition of the transformers, the non-essential consumers.

When taking over the engine room watch, what should you check in the first place concerning the auxiliary diesels and electric power supply ?

That the load, Hertz and Voltage are normal, any other power requirements are in Chief Engineer's standing orders, number of of generators on load.
That the voltage, the kVA, the kVAR, the amperage and the excitation load are acceptable.
That none of the diesels is running at more than 70 % of the load, if so, an additional diesel to be put in parallel.
That the diesels are exactly sharing 50 % of the total load if two are running in parallel or 1/3 of the load with three in parallel.

It is said sometimes that alternators are operating as a load, i.e. as a motor. What are the circumstances for this to occur ?

What information would you find on the name plate of any electric motor ?

Review Answers