Answer / shonali

there is no CW and CCW synchronization it depends on the
speed difference

synchronization is connecting our generator to grid by
matching with the grid frequency.
a synchroscope is used if our generator speed is less than
grid speed (frequency) the synchroscope rotates counter
clock wise (lag).
if our speed is high the scope needle rotates CW (lead)
if it is equal the needle stops

Answer / jock

To ensure the incoming generator takes up load as soon as
the generator circuit breaker is closed.
If synchronism was achieved with the synchroscope
indicating an anti-clockwise rotation the generator would
not take up load and instead would driven by the bus, ie.
reverse powered. If the reverse power is large enough
tripping of the generator is likely to occur.
When manually synchronising a generator to the bus it is
normal to give a quick 'increase' command on the controls
just after the breaker closes to ensure positive power
loading takes place.

Answer / amritpal singh sidhu

I think this is due to the phase sequence, because we use
the sine wave in electrical generation so the sine wave
produced is according to quadrants(In which sine wave is
plotted CLOCKWISE ).

Answer / vikas wadhwa

In my point of view; in modern turbo-generators there is
already provision of about 5% automatic load command as
soon as gen. breaker is closed thus leaving no chances of
gen. tripping on reverse power. Hence, it will not make any
difference technically whether syncronization is done in
cloclwise or anticloclwise direction.

Answer / anees ur rehman

I hope that answer 2 and 4 are v.good.Normally
synchronisation done at 1/10 frequency of incoming
generator kept higher thans the exisisting source.why.yes
when it is synchronised as generator take load its speed
decreases due to low frequency it will trip so its
frequency is kept 1/10 times more than source

Answer / rajas

Synchronization should be done in CW direction , to avoid reverse power trip , because CW means your alternator speed and voltage is slight greater then grid ,after immediate synchronizing load will delivered to grid , other wise there is change of reverse power trip.

Answer / sheena mahany

i didnt get anything . be a little bit more clear....

Answer / manav

There are five conditions that must be met before the
synchronization process takes place. The source (generator
or sub-network) must have equal
line voltage, frequency, phase sequence, phase angle, and
waveform to that of the system to which it is being
synchronized.
(source:----wikipedia)

Clockwise mode of operation is a standard.It has been set to
ensure that phase sequence is not reversed while
synchronizing the generators. Otherwise, same thing might
happen as explained in Answer #7.

Answer / mukul

synchronisation is done in CW direction coz generator should have voltage slightly more than tha system .. because at tha time of synch system start taking load from generator instantly. to avoid generator speed lower than the rated one this needs to do.

Answer / p.anandsah

It doesn't matter if you synchronise TG with Grid in cw or anti cw . Just after synchronisation increase the power as soon as possible.

Is current shock due to voltage or current? pls answer

2 Answers   ABB,

we all know that in transformer, voltage and current are inversely related i.e. Vp/Vs= Is/Ip....so in standard CT..we have a ratio of 200/5...that means our voltage should increase by ratio of 40..althoug that is not the case...because that requires high insulation level.and pratically not feasible......can anybody clarify my ques.......thanx

2 Answers  

what is diff b/w electrical & electronics ?

6 Answers   Bhel, UltraTech,

What is the diff btw Conventional & Addressable Fire Alarm System???

5 Answers   Emerson,

which INDIAN STANDERD in Mention the earth test value?

1 Answers  

Which of the following are the important limitations of rod gap surge arresters? 1. They are not capable of selling off power frequency follow up current. 2. After a discharge, the rods are destroyed completely. 3. Performance is affected by climatic conditions. Use the following codes for selecting the correct answer. Codes: (a)1, 2 and 3 (b)1 and 2 (c)2 and 3 (d)1 and 3

1 Answers  

How to increase the specific gravity of DG batteries?

3 Answers   SCS,

Which motor is suitable for mixer grinders.

12 Answers  

I have 30 kw motor load & i have selected 10 kvar capacitor bank for power factor improvement.my existing p.f is 0.85 & proposed p.f is 0.99 so ,is it right selection? 2 nd question how to connect c.bank whether in delta or star connection & how to decide it?

1 Answers  

when power transformer is flashed which gas is produce in side?

5 Answers  

we have 3*1 MW generator one NGR is common for all it will be selected during paralle our problem is two generator ca be paralled but when slecting third one we need to close NGR selection on third one other wise voltage not matching why?

1 Answers  

If the capacitor bank is installed in switchyard say 132/22kv then on LT side say 22kv/0.433kv is it necessary to install capacitor bank for maintaining power factor. if pf is maintained on HT side then will that be maintained on LT side as well.if not then how&why??????/ please explain...........

3 Answers   MacLellan,