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What are the typical values of field voltage (maximum, minimum and rated) of brushless excitation system for a hydro-generator of 22 MVA capacity? What is meant by DC gain of excitation loop?
manojbaral,
Generator designers and manufacturers each have their own criteria which result in various voltages being used for excitation of generators with exactly the same rating (kW; KVA). And many hydro turbine-driven generators are used for voltage- and VAr support, so the excitation systems are many times more powerful than for a similarly rated generator driven by a steam turbine or a reciprocating engine.
There are also many types of exciters, including brushless, brushed, static, and rotating. The type of exciter used for a particular generator (driven by any type of prime mover) will definitely affect the exciter output (voltage and/or current).
The "DC" part of an exciter usually refers to the "Manual" control loop--the loop that regulates the DC voltage (or current) being applied to the generator (either through brushes or to a brushless exciter stationary field).
There are just too many variables to answer with any certainty. I would suggest you consult the nameplate of the generator you are working with for the rated field voltage/current/resistance and make some calculations of your own.
Or, you could use your preferred World Wide Web search engine to find generators of the rating you're interested in and see of the manufacturers or sellers of them provide any exciter/rotor information--such as Watts, and then try to make some calculations.
IN GENERAL, most synchronous generators are rated for a particular generator terminal voltage at some excitation voltage/current, and the exciters are chosen such that the generator terminal voltage does not exceed more than 5% of the generator terminal voltage nameplate rating nor less than 5% below the generator terminal voltage nameplate rating. But, many generators are NOT designed for being operated at much less than rated generator nameplate terminal voltage. This is because of the heat which can be generated because of leading reactive current flowing in the generator stator (armature) windings and a fear of generator pole slipping--which is extremely destructive.
Hope this helps!
Generator designers and manufacturers each have their own criteria which result in various voltages being used for excitation of generators with exactly the same rating (kW; KVA). And many hydro turbine-driven generators are used for voltage- and VAr support, so the excitation systems are many times more powerful than for a similarly rated generator driven by a steam turbine or a reciprocating engine.
There are also many types of exciters, including brushless, brushed, static, and rotating. The type of exciter used for a particular generator (driven by any type of prime mover) will definitely affect the exciter output (voltage and/or current).
The "DC" part of an exciter usually refers to the "Manual" control loop--the loop that regulates the DC voltage (or current) being applied to the generator (either through brushes or to a brushless exciter stationary field).
There are just too many variables to answer with any certainty. I would suggest you consult the nameplate of the generator you are working with for the rated field voltage/current/resistance and make some calculations of your own.
Or, you could use your preferred World Wide Web search engine to find generators of the rating you're interested in and see of the manufacturers or sellers of them provide any exciter/rotor information--such as Watts, and then try to make some calculations.
IN GENERAL, most synchronous generators are rated for a particular generator terminal voltage at some excitation voltage/current, and the exciters are chosen such that the generator terminal voltage does not exceed more than 5% of the generator terminal voltage nameplate rating nor less than 5% below the generator terminal voltage nameplate rating. But, many generators are NOT designed for being operated at much less than rated generator nameplate terminal voltage. This is because of the heat which can be generated because of leading reactive current flowing in the generator stator (armature) windings and a fear of generator pole slipping--which is extremely destructive.
Hope this helps!
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