Non conventional sources of Energy : Basics, Advantages, Disadvantages and challenges

On Mar 10, 2014 by Sunil Saharan At 4:03 PM | , | 1 comments »
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SCR : Construction, Working and V-I characterstics

On Oct 18, 2013 by Sunil Saharan At 8:35 AM | , | 2 comments »

Series and Parallel Electric Circuits : A Comparison

On Mar 26, 2013 by Sunil Saharan At 7:09 PM | , | 1 comments »
We have already discussed Resistance calculation in series and parallel electric circuits and we have derived two formula from that discussion :
In Series Electric Circuit

REq=R1+R2+R3+....+Rn
In Parallel Electric Circuit

1/R=1/R1+1/R2+....+1/Rn
In current article we will compare these series and parallel circuits.

Series and Parallel Circuits : Comparison


  • Current Path : In series circuit there is only one path for current to flow in the circuit and that is through all the resistances but in parallel circuits the number of total oaths is equal to the number of resistances.
  • Equivalent Resistances :This is already given above as :
    In Series Electric Circuit

    REq=R1+R2+R3+....+Rn
    In Parallel Electric Circuit
  • Magnitude of Current : In series circuit same current will flow through all resistances while in parallel circuit the magnitude of current through any individual resistance will depend upon the resistance of that resistance and other resistances.
  • Electrical Quantity Division : In series electric circuit voltage is divided while in parallel circuit current is divided across varies resistances.
  • Magnitude of Electric Quantity :More the resistance more will be voltage drop in series circuit and less the resistance more will be the current through the resistance in parallel circuit.
  • Total Resistance : In series electric circuit total resistance is always greater that that of all individual resistances while in parallel electric circuit total resistance is smaller the sum of all resistances.
This was the comparison of series and parallel electric circuits, I hope this will help you to differentiate series and parallel electric circuits.

Series v/s Parallel Electric Circuit : Resistance Calculation

Role of Transformer in Transmission System : Technical Aspects

On Mar 2, 2013 by Sunil Saharan At 11:48 AM | , | 0 comments »

Need of Transmission of Electric Power - Technical Aspects

Differences Between Indoor and Outdoor Electric Sub Stations

On Feb 28, 2013 by Sunil Saharan At 11:35 AM | , | 0 comments »
In Basics of Electric Sub Station, we discussed basics of Electric sub station and need of electric sub station and different types of electric sub stations. In current article we'll discuss the differences between Indoor and Outdoor sub stations.

Differences Between Indoor and Outdoor Sub Station

  • Capital Cost : The Capital required to install indoor substation is very high because a lot of buildings are to be manufactured in case of Indoor substation while the capital required for outdoor sub station is small as compare to Indoor sub station.
  • Civil Work : In case of Indoor substation, first we have to prepare building to host larger electrical equipments like Transformers and have to make cut outs for power cables that are bringing power to the sub station. these requires a lot of civil work and hence increasing time required to install the sub station in opposition to this only a small construction work is required in outdoor sub stations.
  • Fault Location : Indoor substations are very compact in arrangement and hence if there is any fault then the location of fault become very difficult while in outdoor sub stations the equipments are placed at different locations so the fault can be sensed easily.
  • Future Expansion : In Indoor sub stations the buildings are constructed according to the size of present transformer so if in future we want to increase the rating of sub station then we have to demolish or make some civil works in the building to host new transformer while in outdoor substations transformers are placed outside so they may be replaced by just increasing the area of fencing.
  • Safety : Indoor substations are more safe as they restrict the entry of animals or any unauthorized person near the transformer while outdoor substations are not much safe.
  • Appearance : Indoor sub stations looks good because there is not and electrical equipment that is visible from outside while in outdoor sub stations appearance is not very good.
  • Maintenance : Maintenance of Indoor substation is not easy. It require both time and specialized labor so it is costly while maintenance of outdoor substation is cheap.

Electric Sub Station : Definition and Indoor v/s Outdoor Sub Station

Electric substations are the heart of a basic power transmission and a distribution system. The power you consume at your home in Lighting, Running various motors like water pump, fans or other domestic motor comes via a wide network and Electric substation is the essential part of that network. In current article We'll discuss What is a sub station and Types of a sub station.

Electric Sub Station : Definition


Electric sub station is a arrangement of various power controlling and power distributive equipments. It includes A transformer, Circuit breakers, power cables, power factor improvement arrangement etc.
A sub station is normally a system that converts very high level electric power ( Power coming at a very high voltage level) to a voltage level that may be used at domestic applications.

Electric Sub Station : Classifications

Electric sub stations are classified into many categories depending upon the nature of mounting of transformer, installation method etc. Below are the types of electric sub stations based on different classifications :

Sub Station Based on Transformer Mounting

Based on How the transformer is mounted to be used in a sub station the substations are of two types :
  1. Pole Mounted : This configuration is used for small rating transformers. Basically there are two pole mounting structures used in Power system.
    These are :
    a) Single Pole Mounting : In this configuration the transformer is mounted on single pole with the help of angles and other metallic structures collectively called transformer platform.

    b) H-Pole Mounting : This arrangement is used for relatively high rating transformers. Two poles are installed so that to provide a base for the transformer. This arrangement is used because the weight of the transformer is more.
  2. Plinth Mounted Sub Station : In this arrangement a foundation is prepared and the transformer is installed on that foundation. This is used for very heavy transformers. A fencing is provided around the transformer to protect it from animals and unauthorized access.
    The foundations serves two basic purposes :
    a) It provide the base to the transformer and
    b) It absorbs the vibrations, if any, in the transformer during the operation.

Indoor Sub Station v/s Outdoor Substation

Indoor Sub Stations : The sub stations that are installed in a building are called Indoor sub stations. In such kind of sub stations transformers are also installed in buildings.
Outdoor Sub Stations : In these type of sub stations the transformers and other heavy and large equipments are installed in outer space and only control equipments are installed in the building.

Classification of Underground Cables

On Feb 19, 2013 by Sunil Saharan At 1:53 PM | , | 0 comments »

Underground Cable : Definition and Basics Terms