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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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here are interconnections between 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..................[:=> 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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ison schemes. Its communication requirementis much larger than the directional or compositephase comparison schemes. However, with such systems,benefit is reaped in terms of higher sensitivity and lowerprobability of false line trips.Phase comparison pilot relaying systems 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 semina..................[:=> 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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s, banks and other intermediaries of the market.
The financial markets 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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ce 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: power plants, industrial plants, transmission substations and distribution substations...................[:=> 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..................[:=> 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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the trouble and damage caused by faults when they do occur. Relays have revolutionized protection control metering and communication in power systems. Relay co-ordination will help to isolate the faulty region in the power system so that the fault at a particular region will not affect the other region in the system. Relay co-ordination can be done by selecting proper PSM and tsm of the relay and co-ordination can be checked graphically . Relay co¬ordination in a power system will help to prevent the great loss and hazards caused due to the faulty conditions. Relays are also used to p..................[:=> 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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em through series fuses instead of circuit breakers. Consequently, no automatic protective relay equipment is required. However, the probability of faults on power transformers is undoubtedly more and hence protection is absolutely necessary.
The transformer is major and very important equipment in power system. It requires highly reliable protective devices. The protective scheme depends on the size of the transformer. The rating of transformers used in transmission and distribution system range from a few kVA to several hundred MVA . For small transformers of medium size ¦over 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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ferential 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 to protect a tapped power line without measuring all the currents in the zone will cost the user in terms of sensitivity and speed of performance.

The following sources of differential error signals need to be addressed to make the application possible:
Total load current of the tapped transformers and lines.
Faults on the low voltage side of the transformers.
Magnetizing..................[:=> Show Contents <=:]



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