Interested to Buy Any Domain ? << Click Here >> for more details...
Why capacitor bank does not require in DG Set?
- 21 Answers
- 68302 Views
- IBM, I also Faced
- E-Mail Answers
Answer Posted / saeed
The field excitation current requirement for a loaded generator depends very much
on the power factor of the load current and in the usual case of lagging power factor
the field current increases as the power factor reduces. On the other hand, with
leading power factor loads the effect is the opposite and as the power factor reduces,the field current requirement for a given output will go down. If the leading power factor of the load circuit is reduced sufficiently, a condition may be reached in which the field current requirement becomes zero and this is known as self-excitation. At this critical point the AVR sensing the generator output voltage would lose control, and any further reduction of the leading power factor would cause overexcitation and the voltage would rise without any corrective action from the AVR. Such a condition is obviously most undesirable and could cause damage to the connected load.
Because self-excitation depends on armature reaction effects from the stator
winding, modern a.c. generators which have high synchronous reactance will reach
this point of voltage instability at a lower level of reactive load than older type
machines which tended to have lower synchronous reactance values. Circuits which have any risk of self-excitation should be carefully examined before arranging to feed them from a generating set supply and in doubtful cases it may be necessary to adjust the values of the power factor correction capacitors.
To prevent voltage instability and voltage transients it is recommended that
power factor correction capacapacitor banks should be disabled when only the standby generation is running.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
What is the function of the generator exciter?
What is magneto on a gas generator. how it functions. its out put is d.c or a.c. how it can be checked for correct functioning
HOW TO CALCULATE EARTHING SIZING?
What are the properties of a resistor?
a governer in an Ic engine controls the
How generator NPS(NEGATIVE PHASE SEQUENCE TEST)TEST WAS DONE? PROCEDURE WITH DETAILS?
what is the formula for calculating the phase clerance between two phases and phase to earth how to calculate the cable for a motor
how u measure/calculate renge of capacitor,capacitor has no any rating tag.what is the theory of measure of capacitons.
how many single tension hardware are required on a double circuit transmission tower?
What is the difference between single core 2 wire and single core 3 wire system? Which application we are using this? and for What purpose we are using this?
In a large office how do we calculate required number of light fittings, assuming fittings are 4x18W or 2x36W fluorescent fitting ?
diff b/w normal grounding and resistance grounding
Minimum IR value of 1.1 kv grade 3.5c (300, 240,185,150,120,95,70,50,35,25) sqmm Aluminium XLPE cable and 4c (16, 10,6 & 4) sqmm cu arm cable between RY,YB,BR,RN,YN,BN,RE,YE,BE & NE.
what happens if dc supply is given and the remedies for it.
What do you mean by Frame 5 Gas Turbine as well as Mark II.
