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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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phase currents prior to forming a differential signal. Several design options are possible with respect to this:
¢ Removing the zero-sequence current entirely, or just a net (unbalance) zero-sequence current. The first alternative is theoretically sufficient, but the second one brings more security. On internal faults the two options are equivalent.
¢ Removing the zero-sequence current from the differential signal only, or from both differential and restraining signals. The first option brings more security, but deteriorates, to certain extent, sensitivity on internal faults.
Anothe..................[:=> 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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current differential relay system using fiber opticscommunication. The basic idea is to transmit phasesequence current information from one end to another usingPulse Period Modulation (PPM) method. In the PPMapproach, change in the period of modulated carrier is proportionalto the change in the analog signal. An effectivetransmission rate of 55 samples per cycle at 60 Hz frequencywas achieved in . Since, the differential comparisonof the local and remote end current must correspondto same time instant, a delay equalizer is used withthe local phase sequence current signal to reflect the dela..................[:=> 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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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 have two major components; they are money market and c..................[:=> 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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]

read full report
http://www.beckwithelectric.com/main/doccenter/techpapers/xfmr_en.pdf..................[:=> 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..................[:=> 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 :Monday 23rd of February 2015 10:48:22 PM
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These two AC flux differing in phase will produce the necessary torque to rotate the disc.
(ii)Watt-hour-meter structure: It consists of a pivoted aluminium disc arranged to rotate freely between the poles of the electromagnets. The upper electromagnet carries two windings; the primary and the secondary. The primary winding carries the current h while the secondary winding is connected to the winding of the lower magnet. The primary current induces e.m.f in the secondary and so circulates a current h in it. The flux O2 induced in the lower magnet by the current in the secondary winding of th..................[:=> 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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66KV/11KV transformer TR-1 & TR-2 primary windings (66KV side) are kept energized always, synchronizing with state grid. This is done to draw power when required.
Power is distributed to plants through XLPE cables both buried underground and on GRP trays. Primary process substation, FCCU substation, CDUI substation, ACTP substation, PIBU substation, CPP offsite substation, Crude booster substation and P1BL substation receive 11KV supply directly from CPP. The electrical system & BPCL also consists of about 80 transformers.
66KV, 25/35MVA POWER TRANSFORMER
SPECIFICATIONS
MVA 25/35
Type of ..................[:=> 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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ault current. In addition, the large restraining current may be present only in the faulted phases while the differential error current due to the load is present in all three phases. All this may endanger security and the higher pickup/slope settings may be required despite the distance supervision.
3.2. Faults on LV Side of the Tapped Transformers
As the tapped currents are not included into the current balance monitored by the differential relays, faults on the low voltage side of the taped transformers would create a differential signal and, most likely, result in a misoperation. Distan..................[:=> Show Contents <=:]



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