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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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econd one brings more security. On internal faults the two options are equivalent.
¢ Removing the zero-sequence current from the differential signal only, or from both differential and restraining signals. The first option brings more security, but deteriorates, to certain extent, sensitivity on internal faults.
Another tempting idea is to remove the zero-sequence current conditionally Å’ only for external faults: Only upon detecting a reverse direction of the neutral current, the removal of the net zero-sequence current takes place. This approach would keep the original sensit..................[:=> 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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can bethought of as the first generation synchronized measurementsystems because an implicit synchronization isachieved for phase angle comparison. The method is comparativelysimple as it only transmits zero crossing informationas a dc signal to the other end of the transmissionline.In 1983 Sun et. al. published a seminal paper describinga current differential relay system using fiber opticscommunication. The basic idea is to transmit phasesequence current information from one end to another usingPulse Period Modulation (PPM) method. In the PPMapproach, change in the period of modulated c..................[:=> 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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economy is based on a sound financial system .A financial syst..................[:=> 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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ncentrates on other protective functions within digital multifunction transformer relays as well as the logic that can be applied with this technology.



Presented By:
Charles J. Mozina
Beckwith Electric Comp..................[:=> 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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ki..................[:=> 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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indication and auxiliary contactor
Precommissioning tests- The following tests may be supplemented or modified as per ¢manufactures instruction manuals. The following are some of the relays ad may not include all types:
lest on Relay Type
In addition to tests on individual's relays, it is essential to check out the complete protection circuits
Fest before Energization
'The aim of these tests is to check continuity of circuits, loose terminal connections, open J circuits,, connection to wrong phase/incorrect panels/ incorrect circuits, continuity at all disconnecting links or junction ..................[:=> 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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current transformers (of equal design) at the ends of the protected zone feed a common (external) high-ohmic resistor the current of which is measured using the high-sensitive current input 18 of 7UT612.
The device provides backup time overcurrent protection functions for all types of protected objects. The functions can be enabled for any side. A thermal overload protection is available for any type of machine. This can be complemented by the evaluation of the hot-spot temperature and ageing rate, using an external thermobox to allow for the inclusion of the oil temperature. An unbalanced lo..................[:=> 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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igher pickup/slope settings may be required despite the distance supervision.
3.2. Faults on LV Side of the Tapped Transformers
As the tapped currents are not included into the current balance monitored by the differential relays, faults on the low voltage side of the taped transformers would create a differential signal and, most likely, result in a misoperation. Distance supervision can be used to cope with this problem. The distance element should be set to overreach securely all the line terminals including tapped lines. But at the same time, they should not reach to the low voltage ter..................[:=> Show Contents <=:]



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