GeekInterview.com
Series: Subject:
Question: 450 of 453

why the suply frequency in INDIA is 50HZ

Asked by: Interview Candidate | Asked on: May 25th, 2006
Showing Answers 1 - 24 of 24 Answers
Karan

Answered On : Jun 21st, 2006

Hi, The frequency of the generated voltage basically depends on:

1). The speed of the Rotor (Field Winding) of the generator/alternator

2). No. of Poles of the  alternator.

By increasing both factors we can increase the generated frequency of the system but in increasing the frequency cost also increasees thats why both factors are limited by the other physical factors and cost. As explained:

1). The speed of the Rotor is limited by the capacity of the 'Prime Mover' which is revolving it and by the strength of the material by which Rotor is made of (otherwise it may bent at high speeds)

2). The no. of Poles are limited by the growing size of the machine.

But simulteneously we can't take very low frequency also as the AC has quite large advantages over DC system.

So, The conclusion is that the frequency band of Around 50-60 Hz is an optimized value of the frequency in both respects i.e. Cost of generation and advantage of frequency. 

If still not clear ->get in touch directely -> karan.sorout@gmail.com/  9313696291

Yes  3 Users have rated as useful.
  
Login to rate this answer.
VIJAY KULKARNI

Answered On : Jun 25th, 2006

hi

There is a condition that in india the electrical power generation is only by natural process such as running water from falls,hydel energy ,bio fuels etc.

But in USA the power gen is nuclear so they have 110v,60Hz.

  
Login to rate this answer.
Akshaya vikram .K

Answered On : Jul 2nd, 2006

The supply in India is 50HZ due to the following factors:

1. Due to cost efficiency

2.Practicaldifficulties in using 60HZsupply as in USA

  
Login to rate this answer.
dayakar jogu

Answered On : Jul 27th, 2006

hi

    The reasons for power supply frequency in India to be 50 Hz and in US to be 60 HZ are:

    1.ENVIRONMENTAL FACTORS

                  The average annual temperature of India is greater than US

     2.POWER GENERATION REASONS

                   To generate power of that frequency it costs alot and the size of the alternator is huge and it costs an incredible amount which we cant afford

      3.EDDY CURRENT LOSSES

                    As frequency increases eddy current and hysteriss losses increasesand hence power loss also increases.

     

Yes  1 User has rated as useful.
  
Login to rate this answer.
Marichamy

Answered On : Jul 14th, 2007

The Formula of that Questions is depend on N=120F/P


N=Speed of the Rotor
P=No of Poles
F=frequency range
120=constant value



By:Marichamy

Yes  2 Users have rated as useful.
  
Login to rate this answer.
Anand modakwar

Answered On : Aug 13th, 2007

because British people established first power plant in India that is of 50 Hzand India then follows the same practice

Yes  2 Users have rated as useful.
  
Login to rate this answer.
abhishek katkar,latur

Answered On : Sep 3rd, 2007

hi,

the first power plant was established by British in india.they ruled us about 150yrs
therefore we r using their principles. also i think the value 50Hz is the optimum value which can be achieved in india on the basis of sources available in india
there r so many factors considered selecting value of frequency which u know
very well

  
Login to rate this answer.
A K SINGH

Answered On : Jun 28th, 2009

View all answers by A K SINGH

In US the frequency is 60hz and 110v supply. In India it is about 240v, 50hz supply. For a particular load say 100kw, the current will be 0.416A, but in US the same load will consume about 0.9A. Here the thing is, the heat produced in the cable bcoz of the flow of current will be large in US compared to India. Since US is a cold country they can use this level but not by India.

Yes  3 Users have rated as useful.
  
Login to rate this answer.
ermanisha

Answered On : Jul 18th, 2009

View all answers by ermanisha

As the N=120f/p
therefore f=NP/120
N= speed of the rotor
p= No of poles
120 is the constant value

  
Login to rate this answer.
Rhombus

Answered On : Jun 11th, 2011

View all answers by Rhombus

This is nothing but a standardisation... u know.. in most of the countries across the world the frequency is 50Hz.....b,coz of this the manufacturer doesn't have to bother much about the consumer particular needs..all consumers will have the same needs..!! suppose now a days u go to purchase a fan u need not to mention the frequency but if it would have not been standardised then u will also have to mention the frequency..!!

Yes  1 User has rated as useful.
  
Login to rate this answer.

in US the frequency is 60hz and 110v supply. but in India is about 240v,50hz supply. for a particular load say 100kw the current will be 0.416A. but in US the same load will consume about 0.9A. here the thing is the heat produced in the cable bcoz of the flow of current will be large in US compare to India. since US is a cold country they can use this level but not by India.

  
Login to rate this answer.
DEVESH

Answered On : Oct 23rd, 2011

in late India when British electrical engineers modifies and make use of uses the 50HZ frequency . After that we Indians manufacturing and marketing in huge amount of our devices and electrical appliances on the basis of that frequency

  
Login to rate this answer.

@A K SINGH,
I believe, what you answered is justifying low(110v) voltage of US, not high frequency.

  
Login to rate this answer.

@Rhombus,

You are right, its all bout standardisation. Once standardisation is fixed for Indian (50Hz) by British, so its continuing and In America its 60 Hz according to their standardisation.

But real question is "why standardization is 50-60Hz only, why not 150Hz or 10Hz?"

Its only because, too low value will create fluctuation in apparatus like Bulb starts blinking(persistence of eye is 15 Hz) and too high value will lead more hysteresis and eddy current losses in many machines.

  
Login to rate this answer.
Anand

Answered On : Nov 9th, 2011

Ok. In the generators the whether the speed (RPM) is constant, or if it is variable how the frequency is maintained constant and how that frequency is formed?

  
Login to rate this answer.
SOURABH JAISWAL

Answered On : Nov 20th, 2011

In India the supply frequency is of 50HZ.
Reasons:

1.For parallel operation In Power station the ratings of all alternators must be same. For this reasons the nos. of poles and prime mover power given to all alternators are same. Hence frequency is constant.
As frequency depends upon speed and nos. of poles.
f=(N*p/120)
where n= syn. speed
p= no. of poles.

2. According to I.S rules all electronic devices uses in India is operated on Freq. range between 50-60HZ.

  
Login to rate this answer.

In the early years when generation of electricity just starts in India , it was on 50 Hz. More and more generators are connected through grid continuously over the years and so the 50 Hz frequency is adopted in India.

  
Login to rate this answer.
madhu y

Answered On : Aug 25th, 2012

View all answers by madhu y

The turbine which is used in generating stations runs at reasonable efficieny in 3000-3600 rpm.

If N=3000 rpm
f=PN/120

If p=2 (generally we take 2)
f=50hz
if N=3600rpm
then f=60 hz

so we take 50 hz as standard frequency for the standard supply of power to the consumers.

  
Login to rate this answer.
shivani shivhare

Answered On : Sep 3rd, 2012

because all the equipments,machines are designed in 50hz in india ,if we change the frequency then all the equipments are not working on that frequency . we use the all the frequencies just as 60hz,65hz,70hz. it depends on the use only.

  
Login to rate this answer.
naveen

Answered On : Sep 8th, 2012

There is no hard and fast rule of 50Hz to be selected as supply frequency. Its just one has to standardize the frequency so that all the equipment are to be designed in this way for maximum utilization. USA is having supply frequency of 60Hz

  
Login to rate this answer.
VAMSI KRISHNA

Answered On : Sep 16th, 2012

I completely agree to the above answers saying the 50Hz frequency is put for a common operating frequency for all electrical equipments to work at.

Also our steam turbines which are major part of Indian electrical power generation are mechanically stable when they run max speed 3000rpm. So this is also a reason behind the standardized 50 Hz operating electrical power supply frequency.

  
Login to rate this answer.
prasad

Answered On : Oct 27th, 2012

Actually 1.) India depends 50hz,becaz Britishers designed as per there country standards.
2) In our market major electric/electronics all are works in funda.
3) Economy of generation,transportation's of power like cables,insulators,devices physical structure,protection relays etc.
4) India power generation depends major on thermal plants so,these boilers are effected by steam pressure.

  
Login to rate this answer.
indira

Answered On : Aug 9th, 2013

bcoz of environmental conditions

  
Login to rate this answer.
Rabindra raut

Answered On : Nov 19th, 2013

The frequency in india is 50 hrz becuase the british designer give this standard acconding to environment condintion the avaibility of euipment and we follows that till now

  
Login to rate this answer.
gowthamreddy

Answered On : Dec 4th, 2013

in steam power plant the speed of turbine should be in b/w 3000-3600 for economical purpose in India we choose 3000 rpm and in US 3600rpm.So, ur freq is 50 hz

  
Login to rate this answer.

Give your answer:

If you think the above answer is not correct, Please select a reason and add your answer below.

Related Open Questions

Ads

Connect

twitter fb Linkedin GPlus RSS

Ads

Interview Question

 Ask Interview Question?

 

Latest Questions

Interview & Career Tips

Get invaluable Interview and Career Tips delivered directly to your inbox. Get your news alert set up today, Once you confirm your Email subscription, you will be able to download Job Inteview Questions Ebook . Please contact me if you there is any issue with the download.