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Category: Power Systems

  • Features and Classification of Substations

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    John Mulindi
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    A substation can be defined as an assembly of apparatus used to change some characteristics like voltage, AC, DC, frequency, power factor, etc., of electric supply. Substations play a key role in power systems. The continuity of supply depends largely upon the successful operation of substations. Thus, it is imperative to exercise utmost care while…

  • How to calculate the Power Factor Correction

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    John Mulindi
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    Let us consider an inductive load taking a lagging current I at a power factor cosΦ1. For us to improve the power factor of such a circuit, the solution is to connect equipment in parallel with the load which takes a leading reactive component and partly cancels the lagging reactive component of the load. Figure…

  • Power System Protection

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    John Mulindi
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    Electrical equipment has to be designed and constructed in such a way as to withstand the foreseeable loading during its lifetime under normal and emergency conditions. It is therefore necessary to install devices for the protection of equipment which limit the effects of unforeseeable faults and loading on the equipment and protect it against cascading…

  • How does diesel engine generate electricity?

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    John Mulindi
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    What is power plant? A power plant is a facility that converts the energy of fuels into electricity. The term power plant is often used to refer to a coal-fired, nuclear, natural gas, or oil-fired electric generating station. Power plants are typically large industrial facilities that provide enough electricity to supply an industrial town or…

  • Data Acquisition and Telemetering in Power Systems

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    John Mulindi
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    To be able to manage and control a power system, the network engineer requires reliable and current information about the state of the network. He obtains this information from power flows, bus voltages, frequency and load levels along with the position of circuit breakers and isolators, the source of these data being in the power…

  • Supervisory Control and Data Acquisition in Power Systems

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    John Mulindi
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    The term supervisory control and data acquisition (SCADA) refers to the network of computer processors that provide control and monitoring of remote electrical or mechanical operation e.g. management of power distribution grid or the control of mechanical processes in a manufacturing plant. Typical the old SCADA systems would encompass computers and network links that manage…

  • A Detailed Note on the Benefits and Working of Automatic Voltage Controllers

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    John Mulindi
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    Automatic voltage Controllers hold a regular voltage level to electrical tools loads that require a steady, dependable voltage supply. With a range of voltage regulation equipment to select from, it can be difficult to pick the excellent one for your tool loads. It is indispensable to be aware of what to look for in an…

  • Types of Busbar Arrangements in Grid Stations and Substations

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    John Mulindi
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    The arrangement and connection of incoming and outgoing feeders in grid stations and substations and the number of busbars have a significant influence on the supply reliability of the power system. Grid stations and substations, and the topology of the power systems must be designed in a similar way and must therefore be included in…

  • Key Factors to Consider In Substation Design

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    John Mulindi
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    Substations are the points in the power network where transmission lines and distribution feeders are connected together through circuit breakers or switches via busbars and transformers. This permits the control of power flows in the network and the normal switching operations for maintenance purposes. We discuss the key factors to consider when designing substations as…

  • Types of Insulators used in Power Systems

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    John Mulindi
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    We have various types of overhead line and substation insulators. Generally they can be classified as: Post Insulators The post insulators comprise of pedestal posts and solid core cylindrical types. Pedestal post insulators The pedestal post insulator stacks employed in substations are available as single units with a range of lighting impulses withstand ratings (LIW)…