ELECTRICAL PROJECT CENTER CHENNAI-MAASTECH BEST ELECTRICAL PROJECT CENTER
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ELECTRICAL PROJECT CENTER CHENNAI-MAASTECH BEST ELECTRICAL PROJECT CENTER CHENNAI/BANGALORE/HYDERABAD/KOCHIN/KERALA/SALEM/TRICHY/VIJAYAWADA, ...

ELECTRICAL PROJECT CENTER CHENNAI-MAASTECH BEST ELECTRICAL PROJECT CENTER CHENNAI/BANGALORE/HYDERABAD/KOCHIN/KERALA/SALEM/TRICHY/VIJAYAWADA,


Dear students,

Maastech offer Ieee projects based on embedded systems related any type of applications..

ipt/final year projects full details....

pre/final year project abstract pl download http://www.slideshare.net/maastech

Ieee Based Embedded System Projects(hardware projects)/FIinal Year Projects/Mini Projects/DiplomaProjects

Inplant Training Details, (ece/eee/it/mechatronics/biomedical

automobiles...

Industrial visit ,project details/ipt details/project discussion/idea sharing......dont hesitate, pl call me..........,dont hesitate, pl call me..........,

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Project Cost nclude Report&Ckt Diagram&Software Programming(Cd)

Inplant training/final year projects/ieee projects on embedded systems pl call me---http://www.maastechindia.com

thanks
R.Ashok kumar
MAASTECH
89. Rangarajapuram main road,(Near SBI Bank)
Kodambakkam
Chennai-600024, http://www.maastechindia.com


PH:044-24844676
R.Ashok kumar-098402 34766
B. Mail velan-098841 01622


ipt/projects full details....Pl visit maastechindia.com (projects list,abstract,video,photo gallery)

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ELECTRICAL PROJECT CENTER CHENNAI-MAASTECH BEST ELECTRICAL PROJECT CENTER Document Transcript

  • 1. Fuzzy Logic Based Differential Relay for Power Transformer Protection
  • 2. ABSTRACT:
  • 3. Power Transformers or any CNC Machines or any electrical devices are always subjected to Highvoltage and low voltage transients. Many devices will get failed due to this. Hence we need to monitor the voltage constantly and if goes below or above the range then we need to trip the supply immedieately. One method of protecting power transformers is to use a differential relay. The operation Diff Relay is to trip the equipment if it finds any difference in the primary and secondary current.
  • 4. Two basic requirements that the differential-relay connections must satisfy are: (1) The differential relay must not operate for load or external faults; and (2) The relay must operate for severe enough internal faults. This is because the diff relay can act due to the following other factors also.
  • 5. In the case of power transformer applications, possible sources of false differential currents are:  Mismatch between the CT ratios and the power transformer ratio  Variable ratio of the power transformer caused by a tap changer  Phase shift between the power transformer primary and secondary currents Magnetizing inrush currents  Transformer overexcitation  Current transformer saturation So, There should be an intelligent Mechanism to prevent the diff relay from fault triggering. In this project we have employed fuzzy logic to prevent this fault triggering. Our system when detects a current difference between the primary and the secondary it also checks for other causes using fuzzy logic and operates the relay only when essential. The other factors which induces the fault triggering is given to the controller through switch inputs. About Fuzzy: Fuzzy Logic was initiated in 1965 by lofti A. Zadeh, professor for Computer science at the university of California in Berkeley. Fuzzy logic is a powerful new technology and has emerged as a profitable tool for the controlling of subway systems and complex industrial processes, as well as for household and entertainment electronics, diagnosis systems and other expert systems. Although, fuzzy logic was invented in United states the rapid growth of this technology has started from Japan and has now again reached the USA and Europe also.
  • 6. Fuzzy has become a keyword for marketing. Electronic articles without fuzzy component gradually turn out to be a dead stock. As a gag, that shows the popularity of fuzzy logic, there even exists a toilet paper with ‘Fuzzy Logic’ Printed on it. In japan fuzzy-research is widely supported with a huge budget. In Europe and the USA efforts are being made to catch up with the tremendous Japanese success. For instance, the NASA space agency is engaged in applying fuzzy logic for complex docking-maneuvers. Fuzzy logic is basically a multivalued logic that allows intermediate values to be defined between conventional evaluations like yes/no, true/false, black/white etc. Notions like rather warm or pretty cold can be formulated mathematically and processed by computers Block Diagram: CPU Monitor
  • 7. Rs232 Mismatch between the Magnetizi ng inrush currents CT ratios and the power transformer ratio Variable ratio of the power transformer PIC EMBEDDED Microcontroller IC-PIC16F877 Phase shift between the power transformer primary and secondary currents Current transformer saturation Relay Driver Full Wave Precision Rectifier (SIGNAL SENSING) PT (V) Power Line Transformer overexcitatio n Differential Relay(10A) CT (A) Full Wave Precision Rectifier (SIGNAL SENSING) PT (V) Power Transformer 0-230/0-24V/10AMPS CT (A)