Selecting a suitable generator for your application- Part 2

05/12/2014 by 3 Comments

Last time,on my post “Selecting a suitable generator for your application – PART 1”,I’m promised to continue discussion about selecting a suitable generator for your application.In this post, I explained details and shared some tips to get a suitable generator for your application.

What’s this THD?

For ensuring smooth and continuous running of generator it is important to measure its THD –total harmonic distortion. When a significant portion of the load on a generator (or any power source for that matter) is non-linear, all the loads fed by the source will see this distortion. read more

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Selecting a suitable generator for your application- Part 1

04/12/2014 by 4 Comments

Ever tried to buy a generator? No? Then, you are saved a potential existential crisis, by God’s grace!! Ask someone who has tried to buy and actually landed with one.

And, he or she would tell you about the trials and tribulations involved in the process. It’s like trying to decode the proverbial riddle: horse before the cart or the cart before the horse!

Do you need a standby generator, single-phase, three-phase, kW, KVA, welder, or motor starting generators? Or, do you need a diesel run or a petrol run generator? read more

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Emergency and standby power system

29/10/2011 by Leave a Comment

When design the electrical installation and electric power for building or factory,the main objective that we need to focus is about emergency and standby electric power systems.The main reason  is the about safety of building occupants following a power outage.

When danger or disaster happened at building or factory such as fire,heavy smoke, chemical hazard,tsunami or earthquake,the emergency procedure backup power system is important and it required for evacuation from the building.

At the very least, emergency and standby power systems should provide lighting to assure the safe evacuation and  panic-free exit of people from the building. read more

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Types of excitation system

05/09/2011 by 5 Comments

On my last post,i already discuss about excitation system for generator.I explain generally about basic operation and application for excitation system.

For more detail about this topic,i want share some information about several types of excitation system that commonly used for generator.

I hope with it can bring up some guide line and basic knowledge about excitation system for generator.I suggest for more detail information and understanding,please contact your local generator supplier.Below are listed types of excitation system for generator :- read more

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Battery systems

10/08/2011 by 2 Comments

Batteries is one of the common thing in our daily application.We used it for domestic and industrial application.It can stored the electricity energy to made our equipment function properly.

We need to choose the suitable type of battery system depend on our application and design to ensure it can operated with maximum capacity.It have in several type such as dry type and wet types with different ampere rating from low to high current capacity.

In the market now we can selected several type of system for battery can suit for our needed and design.Below i listed basic categories for battery system read more

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Low speed protection for A.C generator

29/03/2011 by 1 Comment

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

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Generators in parallel

27/03/2011 by 1 Comment

When generators are operated in parallel condition,it necessary to be arrange for both real power ( kW ) and reactive load ( kVar ) sharing in proportion to their standard rating.Real load output from generator determined by torque applied to the shaft and this can only be controlled by controlling the prime mover driving the generator.

Reactive load is a function of generator excitation.Under parallel operation,adjustment to field excitation does not affect to output voltage.In general,an under-excited machine will generate at a more lagging power factor current.

The three phase sensing regulator operates in similar manner except that the voltage across the reactor carrying a current proportion to one phase current is added to the voltage of that phase. read more

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