Answer / manuks

I assume that the machine we talk about is synchronized
with some power grid. In this case the machine will run at
the frequency of this grid. Any fluctuation on the part of
this machine will bring the synchronizing torque into play
and pull the machine back to synchronous speed. Now suppose
we are opening the governor valve to increase the machine
speed. The synchronous torque will immediately put more load
on the generator, to prevent it from speeding away. This
will result in an increase in its load. Any effort to
decrease the speed will result in the synch. torque removing
some load from the machine and again its speed wil remain
the same.

Answer / arvind

first we will know why governor is used in power plant is
because to maintain frequency constant, in india it is 50hz
now by opening the turbine governor valve increase the
generator load because as you load increases, the frequency
will drop and it is the most impontant thing to maitain
frequency thats why it is done.

Answer / mitesh

governor valve increase it that time generator load is
deincrease

flush point of transformer?

2 Answers  

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what is stepping motor and where can use in electrical installation.

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in star delta starter current is 1/3times the delta value how?

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how does damper winding produces torque in synchronous motor?

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what is the fullform of mccb

10 Answers   Thermax,

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We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?

0 Answers   Siemens,

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What is difference and reason b/w -48V BTS system and 24 V BTS system. Plzzzzzzzzz tel me.

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What are dependent sources?

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how to handle 2500 kva transformar

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hi frienda We have 750kva cater pillet dg set we are fasing one diffrent proublam in dg we are start dg set after one mint applying load around 450a load but dg was run 3 Or 4 mints after 3 mints dg was shuding down automatic how to face this proublam pls tel any budy

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How to measure 20 hp motor resitance

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What should be the values of settling time, peak time, steady state error, overshoot, rise time, MPOS (Maximum percent over shoot) to keep the system in transient state, to keep the system in steady state ?

0 Answers  

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