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APPLICATION OF CURRENT DIFFERENTIAL PROTECTION TO TAPPED TRANSMISSION LINES


Posted by: computer science technology
Created at: Sunday 24th of January 2010 03:45:58 AM
Last Edited Or Replied at :Sunday 24th of January 2010 03:45:58 AM
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ero-sequence removal to cope with external ground faults on the high voltage system...................[:=> Show Contents <=:]



A GPS Synchronized Current Differential Protection of Transmission Lines


Posted by: seminar class
Created at: Tuesday 03rd of May 2011 01:30:16 AM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:22:16 AM
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0 Hz, an uncompensated delay of 1 ms in communicationwill translate into an error of approximately 13 degrees inthe phase computation.The inaccuracies of such a current differential protectionscheme arises primarily due to the following reasons:² Distributed shunt capacitance current of the line.² Approximate delay equalization between local andremote end current.² Series Compensation of transmission line.² Current Transformer (CT) errors due to saturationof the core in presence of decaying dc offset current.

Download full report
http://www.pscc-central.org/uploads/tx_ethpublications/p..................[:=> Show Contents <=:]



COMPARATIVE STUDY OF INDIA INFOLINE WITH OTHER BROKING FIRMS


Posted by: project report helper
Created at: Wednesday 06th of October 2010 04:19:53 AM
Last Edited Or Replied at :Tuesday 07th of June 2011 12:23:03 PM
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TI CHAKRABORTY
EIILM, Kolkata

&
SARVASIS SAHA
BRANCH MANAGER in ULTADANGA at
INDIA INFOLINE


INTRODUCTION

Every modern economy is based on a sound financial system .A financial system is a set of institutional arrangements through which financial surpluses are mobilized from the units generating surplus income and transferring them to the others in need of them. The activities include production, distribution, exchange and holding of financial assets/instruments of different kinds by financial institutions, banks and other intermediaries of the market.
The financial markets hav..................[:=> Show Contents <=:]



DIGITAL TRANSFORMER PROTECTION F ROM POWER PLANTS TO DISTRIBUTION SUBSTATIONS


Posted by: seminar topics
Created at: Monday 22nd of March 2010 12:29:38 PM
Last Edited Or Replied at :Monday 22nd of March 2010 12:29:38 PM
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g at two-bank distribution substations. This paper addresses these types of schemes and their benefits. The following specific areas of transformer protection are addressed in this paper. 1. Power Plant Transformer Protection ¢ overexcitation and differential restraint ¢ generator step-up unit (GSU) transformer ground fault protection ¢ auxiliary / start-up and industrial transformer protection 2. Transmission Substation Transformer Protection ¢ overexcitation (V/Hz) protection ¢ sudden pressure relay (SPR) blocking 3. Distribution Substation Transformer Protection ¢ underfre..................[:=> Show Contents <=:]



Fuzzy Logic Based Differential Relay For Power Transformer Protection reference


Posted by: mutawakkil
Created at: Friday 19th of March 2010 09:02:29 PM
Last Edited Or Replied at :Wednesday 08th of February 2012 01:30:06 AM
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kindly furnished me with what this topic is about i.e steps to achieve the project..................[:=> Show Contents <=:]



RELAY CO-ORDINATION full report


Posted by: project report tiger
Created at: Thursday 04th of March 2010 04:17:24 AM
Last Edited Or Replied at :Thursday 04th of March 2010 04:17:24 AM
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t trigger circuit can be compared to an extremely fast polarized d.c relay and act as a level detector. Transistors are used in common emitter connection giving high input resistance and large current gain. The level detector gives a step output when the input voltage exceeds a specific level.
Output element
This element amplifies the output signal from the ^measuring element, multiplies it, may combine it with certain other signals and also introduce a delay if necessary. Since it has to process only binary signals, this Ineed not be a precision element. It may thus take the form of an auxi..................[:=> Show Contents <=:]



TRANSFORMER PROTECTION USING NUMERICAL RELAY full report


Posted by: project report tiger
Created at: Friday 26th of February 2010 07:25:43 PM
Last Edited Or Replied at :Friday 30th of November 2012 02:01:20 AM
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ploying a more effective device: a spring controlled pressure relief valve. It operates when the pressure exceeds 10 psi but closes automatically when the pressure falls below the critical level. The discharged oil can be ducted to a catchments pit where random discharge of oil is to be avoided. The device is commonly employed for large power transformers of the rating 2MVA and above but it can also be used for distribution transformers of 200kVA and above.
OVERFLUXING PROTECTION
The magnetic flux increases when voltage increases. This results, in increased iron [loss and magnetizing current..................[:=> Show Contents <=:]



APPLICATION OF CURRENT DIFFERENTIAL PROTECTION TO TAPPED TRANSMISSION LINES


Posted by: computer science technology
Created at: Sunday 24th of January 2010 03:45:58 AM
Last Edited Or Replied at :Sunday 24th of January 2010 03:45:58 AM
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the currents only in the main substations. Currents at the taps, either transformers or lines, are not available to the relays. One possible solution to the problem of protecting such configurations is to use directional elements on the tapped transformers to send a blocking signal to the line differential protection system. This approach actually combines the differential protection principle yielding good sensitivity but requiring high-bandwidth communications, with the directional blocking scheme that
may be accomplished using more traditional signaling channels. Depending on the availabil..................[:=> Show Contents <=:]



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