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Articles on Trending Technologies
Technical articles with clear explanations and examples
What is Dimensional Modeling?
Dimensional modeling is a logical design method that follows to present the data in a standard structure that is perceptive and enables high-performance access. It is genetically dimensional and observes to a discipline that needs the relational model with several restrictions.Each dimensional model is composed of one table with a multipart key, known as the fact table, and a group of smaller tables known as dimension tables. Each dimension table has an individual element primary key that correlates to one of the elements of the multipart key in the fact table. This distinctive star-like structure is known as star join. ...
Read MoreWhat are the approaches of the Business Dimensional Lifecycle?
There are various approaches of Business Dimensional Lifecycle which are as follows −Project planning − Project planning addresses the description and scoping of the data warehouse project, such as readiness evaluation and business justification. These are the tasks because of the high visibility and costs related to data warehouse projects.Project planning targets resource and skill-level staffing requirements, coupled with project task assignments, continuation, and sequencing. The resulting integrated project plan recognizes all tasks related to the Business Dimensional Lifecycle and the parties included. It can deliver as the foundation for the ongoing administration of the data warehouse project. Project planning ...
Read MoreEconomic Choice of Conductor Size – Kelvin's Law (Economics of Power Transmission)
The cost of conductor material required for designing a transmission line is a very considerable part of the total cost of a transmission line. Therefore, the determination of proper size of the conductor for the transmission line is very important. The proper size of the conductor for transmission line is determined by the Kelvin’s law (given by Lord Kelvin in 1881).The Kelvin’s law states that the most economical area of conductor is that for which the total annual cost of transmission line is minimum.The total annual cost of the transmission line can be divided into two parts viz. −Annual charges ...
Read MoreDiminishing Value Method of Calculating Depreciation
Depreciation of Power Plant EquipmentThe reduction in the value of the equipment and other property of the power station every year is known as depreciation. Therefore, a suitable amount, called depreciation charge, must be set aside annually so that by the time the life span of the power plant is over, the collected amount equals to the cost of the replacement of the power plant.Diminishing Value Method of DepreciationIn the diminishing value method for calculating the depreciation, the depreciation charge is made every year at a fixed rate on the diminished value of the equipment, i.e. the depreciation charge is ...
Read MoreConductor Material Required in Overhead DC Transmission System
Overhead DC Transmission SystemThe overhead transmission system is the one in which the conductors are hanged with the help of pole supports. When the transmission lines carry direct current, then the system is called the DC transmission system.There are three types of overhead DC transmission systems viz. −Two wire DC system with one conductor earthedTwo wire DC system with mid-point earthedThree wire DC systemConductor Material Required in Two-Wire DC System with One Conductor EarthedConsider a two wire DC system with one conductor earthed as shown in Figure-1. Here, one is the positive wire and the other is the negative wire ...
Read MoreConductor Material Required in Overhead Two-Phase AC Transmission System
Two Phase AC Transmission SystemWhen the transmission system consists of two line conductors for the transmission of AC electric power from generating station to the substations for its distribution, it is called the two phase AC transmission system.Depending upon the number of conductors used, the two phase AC transmission system is of two types, viz. −Two Phase Three Wire AC SystemTwo Phase Four Wire AC SystemConductor Material Required in Two Phase Three Wire AC SystemConsider a two-phase three-wire AC system as shown in Figure-1.There are two line conductors and one neutral wire is taken from the junction of two-phase windings ...
Read MoreTypes of Power Plants for Energy Generation
Power Plant or Power StationA power plant or power station or generating station is an industrial facility for the generation of electrical power.A typical generating station or power plant consists of a prime mover (ex. steam turbine, water turbine, etc.) which is coupled to an alternator. The prime mover converts the energy from some source (ex. coal, water, radioactive materials, etc.) into mechanical energy. The alternator converts mechanical energy of the prime mover into electrical energy. The electrical energy produced by the alternator is transmitted and distributed with the help of conductors to the consumers.Apart from the prime mover and ...
Read MoreCreate Three Equal Columns with Bootstrap grid Layout
To create three equal columns layout with Bootstrap Grid Layout, you can try to run the following code −Example Bootstrap Example Bootstrap Grid Column One Column Two Column Three Output
Read MoreWhat are Load Curves?
Load CurvesThe graph which shows the variation of load on the power station with respect to time is called the load curve of the power station.The load on a power station does not remain constant; it changes from time to time. These changes in the load on a power station during whole day (i.e. for 24 hours) are recorded half-hourly or hourly and are plotted with respect to time on the graph. The obtained graph is called the daily load curve of the power plant.The daily load curve shows the variation of load with respect to time during the day. ...
Read MoreThermal Power Station – Definition, Working, Efficiency, Advantages & Disadvantages
The thermal power plant is a generating station which converts the heat energy of coal combustion into electrical energy. The block diagram of a typical thermal power plant is shown in the figure below.The thermal power plant works on the Rankine cycle. In the thermal power plant, the steam is produced in the boiler by burning of coal. This steam runs the steam turbine which converts steam energy into mechanical energy. After the steam is expanded in the turbine, it is condensed in a condenser to be fed into the boiler again. The steam turbine drives the alternator which converts ...
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