Important: Use custom search function to get better results from our thousands of pages

Use " " for compulsory search eg:"electronics seminar" , use -" " for filter something eg: "electronics seminar" -"/tag/" (used for exclude results from tag pages)


 
 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
EARTHING TRANSFORMERS FOR POWER PPT
Post: #1

EARTHING TRANSFORMERS FOR POWER SYSTEM



.pptx  EARTHING TRANSFORMERS.PPTX (Size: 421.06 KB / Downloads: 35)

ABSTRACT:-

Normally power systems and net works are operated under variable complex stresses. In power systems the faults are not avodable even after taking utmost care at every stage-from planning to maintainance. The grounding of a circuit reduces potential stresses under fault condition. Power feeding from delta delta or if there is no accessibility for star connected transformers occasionally shorted to ground is very common-un-intentional grounding occurs any where from the feeding system to utilization equipment The main objective of grounding neutral is to make a short circuit current sufficient in magnitude for the relay action. This article restricted to zig-zag type with oil filled transformers. The neutral point is usually available at every voltage level from generator to transformers. In the absence of a power transformer of suitable capacity, connection and design a separate grounding transformer can be used . They are inductive devices intended primarily to provide a neutral point for grounding purpose. The main purpose of this paper is to discuss about the difference between Earthing transformer and Power transformer and to discuss about the designing of earth transformers.

COMPARISION BETWEEN EARTHING AND POWER TRANSFORMERS:-

The selection any transformer mainly by two factors-namely, primary voltage and load .For an earthing transformer load is short time or short duty ( only at the time of fault) ,normally from a few seconds to one minute

Significance of zero sequence parameters

In symmetrical components the positive sequence is one having normal phase sequence; the second is of negative sequence with reversed phase sequence; and the third that has no sequence and is called zero sequence - are important parameters. An earth fault is one that part of the current in the faulty phase returns to the supply through the earth. This is due to a symmetrical component consisting of three single phase currents - one in each line, and all being in phase.

Why inter-connected star winding is preferred?

The purpose to establish a suitable ground path can be achieved with the help of three pairs of concentric coils connected to oppose ampere turns. As the fluxes oppose, the transformer takes a very small magnetizing current during normal condition. Lines of force enclosing both coils on one limb are therefore impossible. The earth fault current finds little impedance. This connection has unique characteristics, and is preferred to other types of neutral deriving transformers.
 

Marked Categories : neutral earthing transformer, zig zag trafo ppt, ppt of seminar topic on earthing transformer of power transformer, ppt of earthing power transformer, sizing impedance of zigzag earthing transformer, earthing transformers for power systems seminar, report on neutral grounding oe transformer, two transformers with one neutral point ppt, project report of grounding transformer design, ppts on earthing transformers of power system, earthing transformer for power system ppt, ppt for earthing transformers for power systems, ppt on earthing transformers for power system, earthing transformer for power system, earthing trasformers for power system seminar report,

[-]
Quick Reply
Message
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
  engine overheating alarm ppt Guest 0 0 14-09-2018 03:55 PM
Last Post: Guest
  download full seminar report and ppt on quadrics interconnection network Guest 0 0 10-08-2018 07:30 PM
Last Post: Guest
  vein viewer seminar ppt Guest 0 0 08-08-2018 12:51 AM
Last Post: Guest
  vein viewer seminar ppt Guest 0 0 08-08-2018 12:51 AM
Last Post: Guest
  vein viewer seminar ppt Guest 0 0 08-08-2018 12:51 AM
Last Post: Guest
  quadrics interconnection network ppt Guest 0 0 30-07-2018 03:12 PM
Last Post: Guest
  telluric currents ppt Guest 1 530 16-06-2018 03:19 PM
Last Post: Guest
  i3s technology ppt Guest 0 0 06-05-2018 09:09 PM
Last Post: Guest
  full seminar report and ppt on eyering Guest 0 0 23-04-2018 07:59 PM
Last Post: Guest
Smile gearless power transmission system pdf Guest 6 1,594 16-04-2018 08:28 AM
Last Post: Guest
This Page May Contain What is EARTHING TRANSFORMERS FOR POWER PPT And Latest Information/News About EARTHING TRANSFORMERS FOR POWER PPT,If Not ...Use Search to get more info about EARTHING TRANSFORMERS FOR POWER PPT Or Ask Here

Options: