Low speed protection for A.C generator

For a given excitation,if speed of an A.C. generator is reduced then the output voltage would reduce also.In practice,this reduction in output voltage is sensed by the AVR ( Automatic voltage regulator ) which increases the excitation current to compensate.

However,the field forcing capabilities of the AVR which are necessary to maintain output voltage during rapid load changes,will permit an “over-excitation” condition to exist.

As the regulator is not speed ( or frequency) sensitive,field forcing would occur damage field windings and rotating diode.In order to safeguard the machine against this condition,particularly where low speed duty or idling is anticipated a LSP ( low speed protection ) unit is available to sense prolonged over-excitation and automatically insert current limiting resistance in the field circuit. read more

Generator Rating

Usually the generator is designed to capable to delivery the power supply required due to time basic ( hour ) to ensure reliable operation and prevent serious breakdown.

Typically a given set can deliver more power for fewer hours per year, or less power continuously. That is a standby set is only expected to give its peak output for a few hours per year, whereas a continuously running set, would be expected to give a somewhat lower output, but literally continuously, and both to have reasonable maintenance and reliability. read more

Diesel Generator

This equipment is very common use in power generator industry or backup power supply system.We can found it at many places likes hotel,construction site,factory,hospital,engineering sites,oil and gas industry,on ship and many more.

It is the combination of mechanical power source with electrical generator or in others name it call an “alternator” to generated the electricity.For the mechanical power source,it use the engine powered by fuel.Normally it use diesel due to price and capability of performance.

Diesel generator is completely design with control panel,base,canopy,diesel tank,engine compartment,distribution box,circuit breaker and starting system in one compact package unit. read more