Power Differential Protection
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
puneet_mat
Active In SP
**

Posts: 1
Joined: Mar 2010
#1
09-03-2010, 03:30 PM


[/font]
Reply
seminar-avatar
Active In SP
**

Posts: 549
Joined: Mar 2010
#2
10-03-2010, 09:47 PM

System for power transformer differential protection
In this invention, Current transformer (CT) secondary currents for the windings of a power transformer are used to produce a differential current and An operating current value is obtained from the differential current value. A restraining current value is obtained from processed winding current values.

TECHNICAL FIELD:

It pertains to the transformer internal fault protection for electric power transformers

BACKGROUND

In the occurrence of internal faults in a power transformer, rapid disconnection of the faulty transformer from the power system is necessary to avoid possible extensive damage to the transformer and also to preserve power system stability and power quality. phase overcurrent protection, differential protection using differential currents, and gas accumulator/rate of pressure rise protective techniques etc were used earlier for this purpose. Differential protection is currently widely used as protection against relay internal faults

DISCLOSURE OF THE INVENTION
This apparatus contains:
-A means for developing a differential current value from processed current values,which being the representative of transformer (CT) secondary current values obtained from the windings of a power transformer.
-a method for developing an operating current value from said differential current value;
-means for obtaining even harmonic values of said differential current value
-and a method for comparing the sum of the restraining current values and the even harmonic values with the operating current value and for producing an output signal which in turn is useful in producing a trip signal when the operating current value is larger than said sum.

Current transformer (CT) secondary currents for the windings of a power transformer are used to produce a differential current. An operating current value is obtained from the differential current value. And A restraining current value is obtained from processed winding current values. The Second and fourth harmonic values of the differential current are obtained and they are summed with a restraining current quantity which is a result of the restraining current multiplied by a slope characteristic factor.an output signal is produced which may be used as a trip signal If the operating current value is greater than the sum of the restraining current quantity and the second and fourth harmonic values. This tripping action can be blocked by selected blocking signals generated by another portion of the system.

For more visit:
patentstorm.us/patents/6356421/fulltext.html
Use Search at http://topicideas.net/search.php wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion
Reply

Important Note..!

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

ASK HERE

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

Quick Reply
Message
Type your reply to this message here.


Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  project for fabrication of domestic hydro power plant for houses Guest 1 102 31-10-2016, 03:32 PM
Last Post: jaseela123
  detect power grid synchronisation failure out of range frequency or voltage pdf Guest 1 86 31-10-2016, 03:20 PM
Last Post: jaseela123
  download matlab power system projects Guest 1 60 31-10-2016, 11:41 AM
Last Post: anusree
Sad a project topic for consumer protection act Guest 1 70 31-10-2016, 11:39 AM
Last Post: amrutha735
  m phil maths projects in differential equation pdf Guest 1 73 31-10-2016, 11:21 AM
Last Post: amrutha735
  mhd power generation seminar report pdf download Guest 1 103 31-10-2016, 10:51 AM
Last Post: jaseela123
  abstract large scale power generation using fuel cell ppt Guest 1 134 31-10-2016, 10:37 AM
Last Post: amrutha735
  solar power transmission without medium hypothetical ppt Guest 1 95 31-10-2016, 10:31 AM
Last Post: amrutha735
  howrah bridge power point of 5 pages Guest 1 73 31-10-2016, 09:50 AM
Last Post: jaseela123
  power electronics application seminar topics Guest 1 77 31-10-2016, 09:43 AM
Last Post: anusree