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Note for Basic Electrical Engineering - BEE by Ritesh kumar singh

  • Basic Electrical Engineering - BEE
  • Note
  • Jharkhand Technical University, Ranchi - JTU
  • Computer Science Engineering
  • B.Tech
  • Uploaded 5 months ago
Ritesh Kumar Singh
Ritesh Kumar Singh
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Text from page-3

cables feature more than one conductor, each of which is insulated individually. In addition, an outer insulation layer is added for extra security. Different varieties are used in industries, like the audio multicore ‘snake cable’ used in the music industry. Electrical Earthing Definition: The process of transferring the immediate discharge of the electrical energy directly to the earth by the help of the low resistance wire is known as the electrical earthing. The electrical earthing is done by connecting the non-current carrying part of the equipment or neutral of supply system to the ground. Mostly, the galvanised iron is used for the earthing. The earthing provides the simple path to the leakage current. The shortcircuit current of the equipment passes to the earth which has zero potential. Thus, protects the system and equipment from damage. Types of Electrical Earthing The electrical equipment mainly consists of two non-current carrying parts. These parts are neutral of the system or frame of the electrical equipment. From the earthing of these two noncurrent carrying parts of the electrical system earthing can be classified into two types.   Neutral Earthing Equipment Earthing. Neutral Earthing In neutral earthing, the neutral of the system is directly connected to earth by the help of the GI wire. The neutral earthing is also called the system earthing. Such type of earthing is mostly provided to the system which has star winding. For example, the neutral earthing is provided in the generator, transformer, motor etc. Equipment Earthing Such type of earthing is provided to the electrical equipment. The non-current carrying part of the equipment like their metallic frame is connected to the earth by the help of the conducting wire. If any fault occurs in the apparatus, the short-circuit current to pass the earth by the help of wire. Thus, protect the system from damage.

Text from page-4

Importance of Earthing The earthing is essential because of the following reasons    The earthing protects the personnel from the shortcircuit current. The earthing provides the easiest path to the flow of shortcircuit current even after the failure of the insulation. The earthing protects the apparatus and personnel from the high voltage surges and lightning discharge. Earthing can be done by electrically connecting the respective parts in the installation to some system of electrical conductors or electrodes placed near the soil or below the ground level. The earthing mat or electrode under the ground level have flat iron riser through which all the noncurrent-carrying metallic parts of the equipment are connected.

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