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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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ero-sequence compensating factor for the ground distance elements should be approached carefully. On both internal and external faults the tapped transformers would feed the zero sequence currents. These currents are not measured by the relays, but they will cause extra zero-sequence voltage drops along certain segments of the line (Figure 4). In other words, the zero-sequence impedances of the transformers would appear as shunt elements in the zero-sequence equivalent network thereby decreasing the zero-sequence impedance as seen from the fault location. Again, detailed short circuit studies ..................[:=> 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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arison 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. Segregated phase comparisonis considered to be the most accurate implementationof the phase comparison schemes. Its communication requirementis much larger than the directiona..................[:=> 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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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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distribution substations. This paper addresses these types of schemes and their benefits. The following specific areas of transformer protection are addressed in this paper. 1. Power Plant Transformer Protection ¢ overexcitation and differential restraint ¢ generator step-up unit (GSU) transformer ground fault protection ¢ auxiliary / start-up and industrial transformer protection 2. Transmission Substation Transformer Protection ¢ overexcitation (V/Hz) protection ¢ sudden pressure relay (SPR) blocking 3. Distribution Substation Transformer Protection ¢ underfrequency / unde..................[:=> 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 ..................[:=> 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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ers and allied chemicals, this division adds to FACT'S product mix, a versatile petrochemical, Caprolactum.
Marketting Division
FACT has been a pace-setter in marketting, evolving a continuous and comprehensive package of communication and promotional programmers to increase the fertiliser consciousness among our fanners.
FEDO
FACT Engineering & Design Organisation (FEDO) was established in 1965 to meet the emerging need for indigenous capabilities in vital areas of engineering, design and consultancy for establishing large, modern fertiliser plants.
FEDO has the unique advantage of havin..................[:=> 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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The maximum safe over loading is that it does not over heat the winding. The maximum allowed temperature is about 95 degree Celsius. Thus the protection against over load depends on the winding temperature which is usually measured by thermal image technique.
In the thermal image technique, the temperature sensing device is placed in the transformer oil near the top of the transformer tank. A CT is employed on LV side to supply current to a small heater. Both the temperature sensing device and the heater are
placed in a small pocket. The heater produces a local temperature rise similar to th..................[:=> 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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ervising distance functions.
Another alternative to prevent differential operation during line energization is the use of
harmonic restraint. Harmonic restraint can be provided either internally if a given current differential relay provides it or externally by means of a separate relay. This approach must be approached with caution as the harmonic content may be too low to inhibit the protection during magnetizing inrush conditions. In addition, a harmonic restraint jeopardizes depenability on internal faults accompanied by CT saturation.
3.4. External Faults on HV System
The distance sup..................[:=> Show Contents <=:]



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