WHY AC SYSTEM ARE PREFERRED OVER DC

We (Usually all over the world), In all the countries, We use AC voltage for consuming and for use electricity. Why not DC voltages?
It may ask you in an interview so it's better to know it first.
There are some factors for using AC rather than DC.

• From powerhouse/power plant, we produce AC voltages so it's better to use AC rather than convert it from AC to DC (because there is extra no benefit to using DC). We need to change transformers, breakers and other devices that we are using at the powerhouse.
• It is easy to maintain AC voltages and step up & step down AC voltages as compared to DC.
• The cost of power-plant is much lower than the DC generation plant (transformers, circuit breakers etc).

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WHAT IS THE FREQUENCY OF DC VOLTAGE.

What is the frequency of DC voltage?
   > Due to the graphically straight line, DC voltage has 'NO' frequency but if this voltage is pure DC.
      Unpure frequency has 1.2Hz frequency.

What we do to do DC voltage pure?
   >We use Capacitor for filter the dc voltages for pure dc voltage with 'NO' frequency.

Your answer will be below. Comment below what you think about this.

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WHY THE SUPPLY FREQUENCY ON PAKISTAN IS 50HZ

The Frequency of the generated Voltage basically depends on these points:

1. No. of poles of the Alternator.
2. The speed of generator's rotor (Field Winding).
3. So, by increasing these above both factors, we can increase the generated frequency of the System but keep it in mind that Increase in frequency Cost will also increase so that is why both factors are limited.

The Conclusion is that the frequency band of around 50 Hz to 60 Hz is an optimised value of the frequency in both respects. i.e. Cost of generator and advantages of frequency. We can say that the Supply of Pakistan or India is 50 Hz due to these following factors:

• Due to the Cost efficiency.
• Practical difficulties in using 60Hz supply.

If there is anything else, Comment below your answer for our knowledge and visitor's guidlines.

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ELECTRICAL SWITCHBOARDS STANDARD TESTING PROCEDURE

Electrical Switchgear or Switchboard standard testing procedures step by step guide. These standard testing procedures are applying at Siemens Pakistan Co. as our knowledge (not confirm) also these are according to International Electromechanical Commission IEC and ISO standard too.

All are not in details here but just names were given, for hints just. After this, you have to research it on the Internet for more details and for your knowledge on YouTube or Google. You will find more details easily when you search it by names.
Find the testing procedure names from above header pages of How Electrical blog where new beginners learn easily. Or you can direct go to Electrical switchboard testing page where you will get all these testing procedures easily by Click here and Watch this video #Siemens Switchgear.

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