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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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. A SLG fault has been considered at the ALPHA busbar. Current differential protection on both the circuits is analyzed for this sample fault.
4.1. Simplified Model of the Current Differential Relay
A generic approach to the line current differential protection has been adopted. The differential signal is formed internally as a vector sum of the local and remote currents:

The restraining signal is created internally as an average of the magnitudes:


Pickup and slope are the settings.
4.2. An External AG Fault at ALPHA
The following phasors are measured by the relays (from the sh..................[:=> 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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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 in phase with the line current is generatedand transmitted to the other end on the pilot wire. If theshunt charging current is negligible, then in the absenceof a fault, phase angles of line currents at the two ends ofthe line will be equal. Conversely, a large phase differenceis a signature of the fault. Segreg..................[:=> 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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178]

COMPARATIVE STUDY OF INDIA INFOLINE WITH OTHER BROKING FIRMS

REPORT SUBMITTED IN PARTIAL FULFILLMENT OF REQUIREMENT
FOR
POST GRADUATE PROGRAM IN MANAGEMENT



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..................[:=> 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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c.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 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 :Monday 23rd of February 2015 10:48:22 PM
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e results recorded-relay current is also measured by an ammeter
b) Directional ground relays:-Fuse on the A phase voltage transformer is removed and primary links shorted. C phase C.T. is shorted and disconnected. When the feeder is taken in, service current phases in the relay and a residual voltage gets applied. Depending on the phase angle of the load circuit, the directional relay will operate or restrain. For this test, a phase angle meter is also required so that the actual vector position of load current cold be obtained. In this case the directional relay will operate for load current..................[:=> 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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program which periodically performs a self diagnostic test and issues an alarm signal if any discrepancy is noticed. Other features like a watch-doze timer can also be implemented, which issues an alarm if the [microprocessor does not reset it, periodically within a stipulated time and a few milliseconds. This gives an increased user confidence and improves the reliability and the relay.
Relay Setting Types
The relay requires three types of settings. The settings, described below, determine how the relay recognizes and responds to adverse operating conditions to protect your power apparatus..................[:=> 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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tion to the line and any other load transformers on the line. Automatic reclosing can be coordinated to allow the near circuit breaker to reclose after the distribution fault is cleared and return the line to full service. Typically, however, the tapped transformers are of relatively small power rating and the reach setting that meets the above requirements is often possible. If the considered line is a parallel line and/or has more than one tap and/or there are interconnections between the low voltage sides of the transformers, then detailed short circuit studies are required to set the dista..................[:=> Show Contents <=:]



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