World Of Electrical

Types Of Electric Drive Types of Electric Drive Electric drive can be classified into following categories: (i) Group drive (ii) Individual drive (iii) Multi motor drive. 1. Group Drive: This  is also known as line shaft drive. A big size motor(main motor)drives  a common shaft. Diagram of Group Drive To this shaft, numbers of small machines are connected. Thus a common shaft drives the small machines.The small machines are connected the common shaft by means of multi stepped pulleys as shown in below Figure. Advantages of group drive   ✓ Single motor of big capacity is used so there is considerable saving in cost. ✓ Maintenance is less. ✓ Efficiency and power factor is better if the motor operates near rated capacity. ✓ If machines are overloaded, the group drive is advantageous because the overload occurring for main motor is very less. Disadvantages of group drive  ✓ Any fault on main motors causes stop...

Introduction to Arduino | Pin Function of Arduino | Working Process of Arduino Introduction to Arduino | Pin Function of Arduino | Working Process of Arduino Introduction To Arduino Arduino is an Italian company that designs and manufactures Open Source Hardware (Microcontroller) and Open Source software or IDE (Integrated Development Environment). Arduino hardware is such a programmable computerized platform, by working on which the user can combine the hardware and software and prepare the electronic brain according to his own and can control the electronic devices from that electronic brain. What is arduino? If you want to understand more easily, then we can say that Arduino microcontroller is an empty brain, in which you can upload memory by coding or programming through arduino software, so these are called open source. Arduino works like a CPU of a board computer. Right now the microcontroller of the arduino of this time that we can take up is lik...

Specifications Of 3 Phase Induction Motor Specifications Of 3 Phase Induction Motor Following specifications are required to start the design of 3 phase induction motor:  ✓ Rated output in H.P. or K.W. ✓ Three phases ✓ Frequency in Hz = f ✓ Voltage in volts = V ✓ Connections, star or Delta, Y or ∆ ✓ Speed in RPM = N ✓ Type Squirrel cage rotor or wound rotor ✓ Type of Duty (Continuous, intermittent etc.) ✓ Power factor ✓ Efficiency ✓ Class of Insulation ✓ Temperature rise ✓ Full load current ✓ Pull out Torque Following symbols will be used for design: Q = KVA rating of machine P = Rating of machine in kW Eph = Induced emf per phase in volts (Generally applied voltage per phase = Induced emf per phase) Iph = Current per phase in Amp Tph = Turns per phase D = Diameter of stator core in m. L = Length of stator core in m Ba = Average value of flux density over the air gap Wb/m2 ac = Ampere...

Design of Submersible Motor Design of Submersible Motor Submersible motor is used to drive the submersible pump. Submersible motor is also a squirrel cage type induction motor. Its principle and the general construction is similar to the squirrel cage type induction motor. It means there is laminated stator core and three phase winding in it and there is squirrel cage rotor. But as the whole motor is under water, special type of construction has to be employed. Mainly all the parts are made of the corrosion resistance type materials. Its diameter is less and the axial length is more. Instead of using the ordinary bearings the thrust bearings are used. There are two types of construction of the submersible motor. (1) Wet type submersible motor: This type of motor is completely filled with clean water or oil or emulsion of water and oil. (2) Dry type submersible motor: In this type of motor the stator winding is dry and...

Classification of Hydro Electric Power Plant | Advantages and Disadvantages of Hydro Electric Power Plant Classification of Hydro Electric Power Plant | Advantages and Disadvantages of Hydro Electric Power Plant Classification of Hydro Electric Power Plant is mentioned below: (1) Based on availability of head: These are further classified as: (a) Low head plants (b) Medium head plants (c) High head plants (2)Based on nature of load: These are further classified as: (a) Base load plants (b) Peak load plants (3) Based on quantity of water available: These are further classified as: (a) Run-off river plants without pondage (b) Run-off river plants with pondage (c) Storage type plants. (d) Pumped storage peak load plants. (e) Mini and micro-hydel plants Advantages of Hydro Electric Power Plant ✓ Though its capital cost is comparatively high but it's operation cost is much less. Due to this the cost of power genera...

Schematic Layout of Hydro Electric Power Plant | Working Of Hydro Electric Power Plant A schematic layout of hydro-electric:power plant is shown in below figure. Schematic Layout of Hydro Electric Power Plant A large amount of water is collected during rainy season in a reservoir behind a dam. In case the rainfall is low in a particular year the low head of the reservoir will not be able to meet the maximum load. Therefore, the present trend is to use hydro-electric power plant with steam power plant in an interconnected system. The main components of the hydro-electric power plant and their functions are as follows: (1)Reservoir: A reservoir is used to provided to store water during rainy season and supplies the same in dry season.  The water which comes from the reservoir is used to run the hydraulic turbine. (2) Dam: A dam is define as a structure of considerable height built across the river. The function of d...