Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Post: #1

This paper is an overview of the sources and nature of various transient over voltages and the problems that may result in a low voltage ac distribution system. Voltage transients may be repeatable transients or random impulses and they have got remarkable effects on semiconductors, electrochemical contacts, insulation etc. Switching parallel loads on the same branch of distribution system as well as lighting are responsible for these transient overvoltages. Low voltage ac mains system should be protected from these transient overvoltages. For this we have got various surge suppression techniques such as MOVs, SADs, gas tubes, filters and transformers. For the transient overvotlage protection to be effective the impulse energy should be dissipated in the suppressor and the voltage should be held low enough to ensure the survival of the circuit components. The above surge suppression technologies differ in their current handling, energy dissipating and surge transient capabilities and hence they also differ in their efficiency. Comparing the performance of these devices it can be seen that a combination of gas tube surge arrester and metal oxide varistor is more efficient. We have seen that, transients are of two types, repeatable transients and random transients; random transients being more severe. The adverse effects of these transients on semiconductors, electromechanical contacts and insulation also have been discussed. Inorder to suppress the voltage transients we have got various surge suppression technologies. An ideal surge arrester should have the ability to overcome the current handling and energy diverting of the crowbar type device with the speed of the clamping device. Filters usually require require a series resistor to reduce undesirable effects. Isolation transformer blocks common mode voltage efficiently, but it fails to attenuate different mode voltages. In spark gap technology, the carbon block surface may get pitted and also control of breakdown characteristics is difficult.In dc applications,gas tubes are seem to be more advantageous.When used in ac applications, they require a current limiting device in series between the gas tube and the source of follow-on current. SAD has improved VI characteristics, but poor peak current handling capability. MOVs seem to be ideal in low voltage ac power lines.

Important Note..!

If you are not satisfied with above reply ,..Please


So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Popular Searches: adaptive blind noise suppression pdf, distribution abbreviation, transient overvoltage in electrical distribution system and suppression technique, piling techniques, pdf file free download on causes of over voltages, midwestern electrical, slackware distribution,

Quick Reply
Type your reply to this message here.

Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Electrical Engineering Projects? shakir_ali 3 1,298 10-03-2016 02:56 PM
Last Post: seminar report asees
  Electrical best project bilalmalikuet 2 1,051 05-10-2015 10:47 PM
Last Post: aniruddhachavan7
  Automated Distribution System computer science crazy 12 8,875 04-04-2015 10:57 AM
Last Post: seminar report asees
  Electrical Seminar lists3 computer science crazy 401 157,630 27-01-2015 02:35 PM
Last Post: Guest
  artificial intelligence techniques in power systems full report computer science technology 3 4,538 08-08-2014 10:39 PM
Last Post: seminar report asees
Bug Electrical impedance tomography seminar projects crazy 3 4,313 27-05-2013 11:28 PM
Last Post: Guest
  Distribution System Relaying computer science crazy 3 3,945 08-03-2013 10:12 PM
Last Post: Guest
  Comparison Of Different Electrical Machines For Hybrid Electrical Vehicles Wifi 2 2,125 26-11-2012 08:33 PM
Last Post: Guest
  ELECTRICAL HEATING METHODS seminar surveyer 2 3,030 26-11-2012 03:43 PM
Last Post: seminar details
  Image Authentication Techniques computer science crazy 2 3,435 15-11-2012 12:24 PM
Last Post: seminar details