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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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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 when the relay is set to restraint on the total tap load current. Another solution to the differential error signal caused by the unmonitored load current is to apply distance supervision. The setting requirement is to overreach all the line terminals but avoid picking up on the load current. The overreaching distance elements will, ho..................[:=> 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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rate 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 phase differenceis a signature of the fault. Segregated phase comp..................[:=> 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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t 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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tage (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. Since transformer protection requirements vary depending on the application, users typically want only those functions which are needed for that specific application. To accom..................[:=> 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..................[:=> 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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ter than the pickup value and the beam is attracted to close the trip circuit. This causes the opening of the circuit breaker to isolate the faulty circuit.
INDUCTION RELAYS
Electromagnetic induction relays operate on the principle of induction motor and are widely used for protecting relaying purposes involving AC quantities. They are not used with DC quantities owing to the principle of operation. An induction relay essentially consists of a pivoted aluminum disc placed in two alternating magnetic fields of the same frequency but displaced in time and space. The torque is produced in the d..................[:=> 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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Figure shows the block diagram of a numerical relay. The signals from the CTs and PTs cannot be sampled directly and converted to the digital form. This is to make sure that the signal does not contain frequency components having a frequency greater than one half of the sampling frequency. This limit is enforced by the sampling theorem. Therefore, the signals are first passed through a low-pass filter, which has to be an analogue type of filter because digital pressing can only take place after the frequency spectr..................[:=> 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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ays. One possible solution to the problem of protecting such configurations is to use directional elements on the tapped transformers to send a blocking signal to the line differential protection system. This approach actually combines the differential protection principle yielding good sensitivity but requiring high-bandwidth communications, with the directional blocking scheme that
may be accomplished using more traditional signaling channels. Depending on the availability of the CBs at the tap, the blocking signal should be sent for transformer and downstream faults (when the CBs are insta..................[:=> Show Contents <=:]



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