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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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ecure reach may be calculated.
One may test, or get the required information from the vendor, as to the maximum allowable reach of a distance element that would not be picked up on transformer inrush current. An example of an impedance estimate during inrush might look like:

Assuming the transformer is very close to the substation, the reach of the distance element should not be higher than some 0.75 of the transformer impedance. If the peak inrush current is K times the transformers rated current, one obtains the following equation for the K, guaranteeing that while set to 75% of the tr..................[:=> 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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ch 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 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..................[:=> 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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y 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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oad shedding The application of t..................[:=> 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.hD lev..................[:=> 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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ross the relay and the generator open circuit [voltage slowly built up to reach the pick-up value of the generator ground relay. The voltage is then brought down and the set shut down.
10) Tests when equipment is in load service:
a)Phase angle measurement:-A phase angle meter is used to check (i) phase
difference between relay currents and a fixed reference potential, say, the bus voltage transformer and (ii) phase difference between relay current and potentials applied to the relay, say, for directional relays.
It is advisable to do the check on all newly commissioned relay circuits and t..................[:=> 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 monitored in the relay. Therefore, complete thermal monitoring of a transformer is possible, e.g. hot-spot calculation of the oil temperature.
The protection relay can be parameterized for use with three-phase and single-phase transformers.
The integrated programmable logic (CFC) allows the users to implement their iown functions, e.g. for the automation of switchgear (interlocking). User-defined messages can be generated as well. The flexible communication interfaces are open for Imodem communication architectures with control system. Alternatively to the conventional overload protectio..................[:=> 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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ecause the net current is lower than the sum of magnitudes of the charging and total load currents.
When a line differential relay uses a traditional characteristic with separate boundaries created by slope and pickup settings, then only the pickup setting can prevent misoperation due to the leaking load current - increasing the slope does not help in single infeed situation. Some relays, however, combine the pickup and slope settings when creating the restraining current (for a given restraint level the higher the slope, the lower the pickup). This gives a chance for better sensitivity even ..................[:=> Show Contents <=:]



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