List the methods of improving power factor? Static capacitors Synchronous condenser Phase advancers Static capacitors: The power factor can be improved by connecting capacitors in parallel with the equipment operating at lagging power factor....
Explain the three methods of Cable laying of Underground cable with necessary sketches? There are three main methods used for laying underground cables. 1. Direct laying: A trench of about 1.5 meter deep and...
Insulators used in Underground Cables The commonly used materials for insulation are impregnated paper, VIR, PVC, varnished cambric or rubber mineral compound. RUBBER: It is the most commonly used insulating material. Natural rubber is produced from...
Explain different causes of failure occurs in insulators An insulator must be properly designed so as to withstand mechanical as well as electrical stresses.Electrical stress on insulator depends on the line voltage, and hence,...
Construction of Under Ground Cable: The general construction of under ground cable is shown in below. The various parts of the cable are, Cores or Conductors: A cable may have one or more than...
Pressure cables For voltages beyond 66 kV, the electrostatic stresses in the cables exceed the acceptable values and solid cables become unreliable. This occurs mainly because voids are created when voltages exceed 66 kV....
Screened cables These cables are used up to 33kv, but some particular cases it may be extended to operating voltages up to 66kv. It is further classified into two, H type and SL type...
Classification of Cables according to their Construction: Electrical cable classification can be done on the basis of their construction as under: Belted cables — up to 22 kV Screened cables — from 22 kV...
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