Option 3 Insulators strings are extensively used for suspension of overhead transmission line and have provided excellen

[answerhappygod]

Option 3 Insulators Strings Are Extensively Used For Suspension Of Overhead Transmission Line And Have Provided Excellen 1 (136.77 KiB) Viewed 39 times

Option 3 Insulators strings are extensively used for suspension of overhead transmission line and have provided excellent service for decades. However, overhead insulator has crucial problems when dealing with contamination. The deposition of contamination source especially from industrial and coastal areas on the insulator surface becomes a major concern. This will greatly affect the voltage and electric field (e-field) distribution of insulator string from insulator pin to insulator cap. Intense e-field and voltage distribution are believed to easily lead to corona, partial discharge, premature aging and even flashover to happen in and around the insulator. These problems will affect the distribution of electricity throughout the country as well as affecting the operation of transmission lines. Therefore, the calculation of e-field and voltage distribution in and around the insulation against contamination is important to be studied to improve the reliability of the system'. Based on the above scenario, you and your team as the responsible electrical engineers are required to: i. ii. iii. Investigate the electric field and voltage distribution around the pin and cap insulator of high voltage power lines. Investigate how does the design and material used for the insulator will affect the electric field and voltage distribution around the insulator. Suggest the best insulator design and type of material to be used for the insulator so that the voltage and electric field intensity is at their minimum level. The electric field distribution pattern can be calculated and shown using QuickFieldTM software. You may use information given in Table 1 as guidance or else any other values can also be used. Table 1 Material properties of the insulator Types of material Relative permittivity, Glass Cement grout Air Contamination Er 4.2 15 1 81 Electric Conductivity, o (S/m) 0 10-4 0 10-3