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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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ne side. The neutral current supplied by the transformers will be measured by one terminal of the line only (Figure 5) and will create an unbalance of the differential signal causing a false trip.
In order to ensure security, the differential relays must not respond to the zero-sequence current. As a digital differential relay may be designed to operate on a per-phase basis, they will respond to the neutral current. One solution is to set the mode of operation of the differential to operate either on positive or negative-sequence currents or a combination of thereof. Another solution is to re..................[:=> 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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c-central.org/uploads/tx_ethpublications/pscc2008_613.pdf..................[:=> 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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BY



D.RAVI
EIILM/PGP/08-09/2H023
JULY, 2009



UNDER THE GUIDANCE OF
CHANDRAJYOTI 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 ..................[:=> 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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dustrial plants, transmission substations and distribution substations. Since transformer protection requirements vary depending on the application, users typically want only those functions which are needed for that specific application. To accommodate this customized functionality, the selection of transformer protective functions should be determined by users as opposed to manufacturers” the same as is done with discrete relay applications. This paper discusses user-selectable functionality that tailors the relay to specific applications. In addition, the use of programmable logic ext..................[:=> 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 up to P..................[:=> 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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duced by two pairs of coils wound on four poles. The rotating field induces currents in the cup to provide the necessary driving torque. If i and 2 represent the fluxes produced by the respective pairs of poles, then torque produced is proportional to 0i2 sin a where a is the phase difference between two fluxes. A control spring and the back stop
for closing of the contacts carried on an arm are attached to the spindle of the cup to prevent the continuous rotation.
Induction cup structures are more efficient torque producers than the shaded-pole or the watt-hour-meter structures. 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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and current distribution
L-,
\ H
\
J
Figure 2-18 Example of an earth fault outside :ne protected transformer with a neutral earthing reactor within tie protected zone
Increasing the Ground Fault Sensitivity
Higher earth fault sensitivity in case of an earthed winding can be achieved if the starpoint current is available, i.e. if a current transformer is installed in the starpoint connection to earth and this current is fed to the device (current input 17). Figure 2-19 shows an example of a power transformer the starpoint of which is earthed on the Y-side. In this case, the zero..................[:=> 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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as the tapped connections are meant to provide a cost-effective alternative to actual substations. The taps are made outside the main substations and may not be equipped with proper protection means such a Circuit Breakers (CBs) and Current Transformers (CTs). Also, high-speed communication from the tap site may be a problem. This either limits the application of line current differential relays or makes the tapped connections economically less attractive. This paper discusses application problems and solutions permitting the application of current differential protection to tapped transmissio..................[:=> Show Contents <=:]



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