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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 magnetizing inrush current:

Assuming a 10% short circuit voltage for the transformer, one would get K = 57.7. This means that as long as the maximum peak inrush current is less than some 57 times the rated current, the considered distance relay set to reach up to 75% of the transformer impedance will not pickup during the inrush conditions. This is a pretty good security margin, as a typical magnetizing current will be significantly lower than 50 times rated. It must be kept in mind that this example is valid for the assumed distance characteristic of (1).
Another factor to consider ..................[:=> 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
differential protection of transmission line seminar, protection of transmission system by gps , microcontroller based fire fighting robot ppt, differential protection for transmission lines , synchronized differential protection, current differential protection image , synchronized current differential protection, current differential relay with gps synchronization , advantages of gps synchronised current differential protection of transmission lines,
ract
The current differential protection scheme isone of the most sensitive method for protection of transmissionlines. However, its sensitivity can be compromisedby distributed shunt capacitance of the line, presence of seriescapacitor, current transformer inaccuracies and communicationlatency as well as asymmetries in communication.This paper proposes a novel sensitive current differentialprotection scheme for transmission line protection. Ituses Global Positioning System (GPS) for time synchronizedmeasurements while fibre optic is preferred for communication.The fictitious current Ise..................[:=> 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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rkets have two major components; they are money market and capital market.

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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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functions that can be incorporated into the transformer protection package to enhance value to the user. Other protective functions include overexcitation protection (24), neutral overvoltage (59G), ground differential (87GD) and underfrequency (81U)/undervoltage (27) load shedding. Presently, many of these functions are handled via separate discrete relays or not applied at all because of economic considerations. Transformer protection requirements also vary depending on the location of the transformer on the power system. This paper discusses transformer protection at various locations: pow..................[:=> 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 t..................[:=> 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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pple. Through setting network consisting of fixed and variable resistors, clipping diodes, etc. the measured value of the quantity is fed into a harmonic filter since the subsequent measuring element deals only with d.c variables. Sometimes smoothing filters are used to eliminate ripples, but in high speed relays such filters cannot be used.
Measuring element
This is an analogue-binary signal converter with measuring functions. In the simplest form it consists of the Schmitt trigger circuit as the basic circuit. The Schmitt trigger circuit can be compared to an extremely fast polarized d.c r..................[:=> 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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ration.
Independent of the conditioning of the starpoint.
Differential Protection for Mini-Busbars and Short Lines
Current restraint tripping characteristic.
Short tripping time.
Insensitive against DC offset currents and current transformer saturation.
> High stability also for different current transformer saturation.
> Monitoring of the current connections with operation currents
Bus-Bar Protection
*> Single-phase differential protection for up to seven feeders of a busbar.
Either one relay per phase or one relay connected via interposed summation current transformers.
Curre..................[:=> 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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to provide sufficient protection for the transformer, a direct transfer trip must be actually sent by the transformer protection to the relays in the main substations. In any case, reliable communication is required from the tap (-s) to the main substations. This paper presents a solution that assumes that high-speed communication from the taps facilitating digital current differential protection is not available. It is assumed that the protection zone must cover the entire line including taps and a portion of the high voltage windings of the transformers. It is to be noted that the ability t..................[:=> Show Contents <=:]



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