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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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the well-known requirements of high-speed communication and sampling synchronization, a microprocessor-based differential relay requires Å’ as per principle of differential protection Å’ that the currents are monitored on all the circuits connected to a protected line including tapped transformers and lines. This may create a problem 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 ..................[:=> 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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nce relaysare used to determine the direction of the fault (fault detector)and this information is transmitted to other end of theline. With this additional information, it can be quickly ascertainedwhether the fault lies on the transmission line ornot. While such methods work with low communicationrequirements, they may maloperate on post-fault systemdynamics like electrical center created by power swing(primary and backup).In the phase angle comparison schemes, phase anglecomparison is made between the current phasor of twoends of the transmission line. For this purpose, usuallya square wave..................[:=> 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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/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 by financial institutions, banks and othe..................[:=> 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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pplication, 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 extends the benefit of digital multifunction transformer protection especially for distribution transformer applications. Logic schemes have..................[:=> 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 step..................[:=> 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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lashback (back fire)
L-load limiting Z-special application ZS-zero sequence
Fourth letter: M-special variations
First number: indicates the number of units in the relay essential to its operation-not including seal-in auxiliary units. Second number indicates a particular character of one of a group of similar relay.eg: CDE 11, CDG 12, similar character but different curve.
MAIN AND BACKUP PROTECTION
I Primary protection is essential protection provided for protecting an
¦equivalent machine. As a precautionary measure an additional protection is [generally provided and is called ..................[:=> 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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th 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 sequence current is not eliminated. Instead of this, 1/3 of the starpoint current ISP is added for each phase.
1-1 ¢
-e..................[:=> 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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ween the low voltage sides of the transformers, then detailed short circuit studies are required to set the distance supervising functions as well as a means of disconnecting any positive sequence source In most cases, the tapped transformer is delta on the high side and grounded wye on the low side. This configuration provides a natural differentiation for internal versus external ground faults as transformer low side ground faults will not present any zero sequence current to the differential relay. As such, a ground overcurrent element in the differential can be used to enable differential ..................[:=> Show Contents <=:]



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