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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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e 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 such, the biased characteristic does not help. One solution to the problem is to raise the pickup setting above the sum of the maximum total load current and the line charging current. It should be noted that the penalty for raising the pickup setting is loss of sensitivity.
As far as the charging current is concerned, the following should be taken into account. For long lines, the compensating reactors may be used, therefore ..................[:=> 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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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 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 Mod..................[:=> 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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ncial surpluses are mobilized from the units generating surplus income and transferring them to the others in need of them. The activities include production, distribution, exchange and ..................[:=> 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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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 accommodate this customized functionality, the selection of transformer protective functions should be determined by users as opposed to manufacturers” the same as is done with discrete relay ap..................[:=> 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 th..................[:=> 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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r a plunger being drawn into a solenoid. Such relays may be actuated by DC or AC quantities. The important types of electromagnetic attraction relays are:
(i) Attracted armature type relay: It consists of a laminated electromagnet M carrying a coil C and a pivoted laminated armature. The armature is balanced by a counterweight and carries a pair of spring contact fingers at its free end. Under normal operating conditions, the current through the relay coil C is counterweight
(ii) Solenoid type relay: It consists of a solenoid and movable iron plunger.
Under normal operating conditions, the ..................[:=> 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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ations of microprocessor-based applications of microprocessor-based relays for the protection modem complex power network.
TECHNOLOGY COMPARISON FOR PROTECTIVE RELAYS
SI.
No SUBJECT ELECTRO MECHANICAL STATIC/ ELECTRONIC NUMERICAL
1 Measuring
elements/
Hardware Induction disc, Electromagnets, Induction cup, Balance Beam Discrete R, L, C Transistors, Analogue ICs comparators Microprocessor s, Digital ICs, Digital signal
processors
2 Measuring method Electrical Qtys converted into mechanical force, torque Level detectors, comparison with reference value in analogue comparator A/D conversi..................[:=> 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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pickup setting based on the connection status of the shunt reactors. Alternatively, the shunt reactor current can be input directly to the relay and digitally subtracted from the total current. Digital relays can also directly compensate for the charging current by virtually calculating the charging current on-line using the terminal voltage and line parameters. Such compensation can attenuate the differential error current due to capacitive charging by a factor of ten. The charging current that is seen by the differential relay Å’ regardless of the compensation by the shunt reactor..................[:=> Show Contents <=:]



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