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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 line differential system as an error signal. Typically, the amount of load drawn from tapped connections is low as compared with the power transferred between the main substations. This provides the opportunity to restrain the differential relay by the bias current. However, as the number of taps increases (as high as five), the total load current leaking from the differential zone may become quite high. Also, when the line is initially energized, the entire load current is supplied from a single terminal and the differential error current will be equal to the restraining current and, as s..................[:=> 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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the period of modulated carrier is proportionalto the change in the analog signal. An effectivetransmission rate of 55 samples per cycle at 60 Hz frequencywas achieved in . Since, the differential comparisonof the local and remote end current must correspondto same time instant, a delay equalizer is used withthe local phase sequence current signal to reflect the delayof the modem process of remote quantity. For example, at50 Hz, an uncompensated delay of 1 ms in communicationwill translate into an error of approximately 13 degrees inthe phase computation.The inaccuracies of such a current ..................[:=> 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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gements through which financial surpluses are mobilized from the units generating surplus income and transferring them to the others in need of them. The activi..................[:=> 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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ckage 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: power plants, industrial plants, transmission substations and distributio..................[:=> 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..................[:=> 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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peration of the relevant circuit breakers, alarms etc. Some of the tests are to be repeated at periodic intervals to ensure continued and proper functioning of relays and circuits.
*
Preliminary Examinations and Checks
Relays should be examined for the following:
a) Damage like dents, broken glass covers, loose parts, etc.
b) Iron filings in the air gaps of magnets.
c) Moving parts getting jammed, etc.
d) Rating, range, auxiliary supply voltages as per drawings or specifications.
e) Mounting as per manufacturers specifications.
f) Contact surfaces of output relay contacts should not b..................[:=> 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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Duncan Brothers of Calcutta.
The formation agreement provided for the construction of a petroleum refinery in South India Petroleum and for continuing technical collaboration with Philips during a number of years. Government was to see to the marketing of all domestic products and exercise control over the company.
MILESTONES OF GROWTH
YEAR DEVELOPMENT
* 1966 Unit commissioned with Crude Oil Refining capacity
of 2.5 MMPTA
* 1973 Capacity expanded from 2.5 to 3.3 MMPTA
* 1984 Capacity expanded from 3.3 to 4.5 MMPTA
* 1989 Aromatic production commenced
* 1990 Captive power plant (26.3 ..................[:=> 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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sure security, the differential relays must not respond to the zero-sequence current. As a digital differential relay may be designed to operate on a per-phase basis, they will respond to the neutral current. One solution is to set the mode of operation of the differential to operate either on positive or negative-sequence currents or a combination of thereof. Another solution is to remove the zero-sequence current from the phase currents prior to forming a differential signal. Several design options are possible with respect to this:
¢ Removing the zero-sequence current entirely, or just..................[:=> Show Contents <=:]



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