Q:What is Automatic Voltage regulator(AVR)?
A:AVR
is an abbreviation for Automatic Voltage Regulator.It is important part
in Synchronous Generators, it controls theoutput voltage of the
generator by controlling its excitation current. Thus it can control the
output Reactive Power of the Generator.
Q:What is an exciter and how does it work?
Q:What is an exciter and how does it work?
A:There
are two types of exciters, static exciter and rotory exciter.purpose of
excitor is to supply the excitation dc voltage to the fixed poles of
generator.Rotory excitor is an additional small generator mounted on the
shaft of main generator. if it is dc generator, it will supply dc to
the rotory poles through slip ring and brushes( conventional
alternator). if it is an ac excitor, out put of ac excitor is rectified
by rotating diodes and supply dc to main fixed poles.ac excitor is the
ac generator whose field winding are stationary and armature rotates.
initial voltage is built up by residual magnetism.It gives the starting
torque to the generator.
Q:Difference between a four point starter and three point starter?
A:The
shunt connection in four point stater is provided separately form the
line where as in three point stater it is connected with line which is
the drawback in three point stater
Q:Why use the VCB at High Transmission System ? Why can't use ACB?
Q:Why use the VCB at High Transmission System ? Why can't use ACB?
A:Actually
the thing is vacuum has high arc queching property compare to air
because in VCB ,the die electric strengths equal to 8 times of air .
That y always vaccum used as inHT breaker and air used as in LT .
Q:What is the difference between surge arrestor and lightning arrestor?
Q:What is the difference between surge arrestor and lightning arrestor?
A:LA
is installed outside and the effect of lightning is grounded,where as
surge arrestor installed inside panels comprising of resistors which
consumes the energy and nullify the effect of surge.
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