Answer / s.karthik

Presuminng that the field excitation is increased,incresed excitation produces more flux and hence more current which the winding may not handle resulting in the production of exessive heat.As a result the the alternator may burn

Answer / jakeer

The output voltage will be high & due to this over voltage
relay will trip the Alternator.

Answer / raul

If the excitation of an alternator is increased, then the
excitation voltage will increase, more flux in the air gap,
more rotor heating. But the excitation increase is governed
by the ROTOR HEATING LIMIT as per the generator capability
curve which over-rides the STATOR HEATING LIMIT. Above the
RHL, the automatic voltage regulator (AVR) takes over
control and starts reducing the excitation by Rotor current
limiter which acts in conjunction with the AVR.

what is the difference in MCB, MCCB, RCCB, ELCB, & MPCB (motor protection circuit bracker)

12 Answers   Afcons, Bhel, CIHSR, DCS, IOCL, L&T, Lupin, Siemens,

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What is SNMP Card Monitoring in UPS???

2 Answers   Emerson, MAA, SNMP,

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How to select the different contactors ( starter combination) for different AC motors? what about fuse cappacity 4 different motors too?

2 Answers   Equate,

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I have a question, I visit 01 site and face a problem, there is 2.5 ton Air Con working, when air con compressor is running at that time rectifier voltages are increasing upto 290-295 v and rectifier is giving main high alarm (rectifier is APC single phase), before starting compressor rectifier voltages was 230v. when air con is going off rectifier voltages are decreasing smoothly at its actual voltages 230v. Load on Genset phases is this: Red-13.5 amp AC (Air Con load), Yellow-1.7 amp AC (BTS lights etc.) and Blew-4 amp AC (telecom system load), Genset phase to phase and neutral to phase voltages are also ok. These are 10 sites having same system and same rectifier APC brand at every site 02 genset are working but the problem is same at all these 10 sites. What will be the reason behind???

1 Answers  

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Why effective AC resistance is more than DC resistance of a transmission line?

9 Answers   HCL, ONGC,

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mounting of bucholz relay engle on transformer

4 Answers  

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While starting a high capacity motor, it takes 6 times the full load current. Why it doesn't trip relay or CB's in that network?

4 Answers  

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Lt motor sfu flashing reasons?

0 Answers   NDFL,

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how to calculate bus-bar sizes? (copper bus-bars)

2 Answers  

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Hi guys! Plz help me to answer the following questions. 1. What are the types of transmission line energy losses? 2. Why are the VLF are used some types of services? 3. What frequencies are used for reliable beyond the horizon terrestrial communication without repeaters? 4. To permit selection of 1 out 16 equi-probable, what is the number of bitis required? 5. What is the most common modulation used for telegraphy? 6. What is the multiplexing is used to increase the capacity of the optic fiber? Thanks

0 Answers  

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In electrical cables what is U and U0 refers?

11 Answers  

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plz tell me about for how many rating (for 500kva)how much current taken?

13 Answers  

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