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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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nce current is removed from the differential signal the required settings are as follows:
¢ a pickup of 83.2 A or a slope of 16 % 41.6/256.7*100%) for the circuit 1 protection, and
¢ a pickup of 84.5 A or a slope of 16% (42.2/259.8*100%) for the circuit 2 protection.
This example shows that sensitive settings can be preserved if the zero-sequence current is removed from the differential currents.
5. Conclusions
The application of line current differential protection to lines with tapped transformers has been presented. The approach taken does not require measurements at the taps, an..................[:=> 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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vecomparisoncurrent differentialcharge comparisonphase comparisonblockingunblockingtransfer tripcomposite phasecomparisonsegregated phasecomparisonFigure 1: Classification of pilot relayingIn the directional comparison scheme, distance relaysare used to determine the direction of the fault (fault detector)and this information is transmitted to other end of theline. With this additional information, it can be quickly ascertainedwhether the fault lies on the transmission line ornot. While such methods work with low communicationrequirements, they may maloperate on post-fault systemdynamics like ..................[:=> 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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QUIREMENT
FOR
POST GRADUATE PROGRAM IN MANAGEMENT



BY



D.RAVI
EIILM/PGP/08-09/2H023
JULY, 2009



UNDER THE GUIDANCE OF
CHANDRAJYOTI CHAKRABORTY
EIILM, Kolkata

&
SARVASIS SAHA
BRANCH MANAGER in ULTADANGA at
INDIA INFOLINE


INTRODUCTION

Every modern economy is based on a sound financial system .A financial system is a set of institutional arrangements through which financial 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 holding ..................[:=> 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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87T) has been discussed in detail in many other papers and will therefore not be discussed here. Inste..................[:=> 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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kindl..................[:=> 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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racteristics and accuracy.
9. Simplified testing and servicing is possible.
10 Several functions can be accommodated in a static relay.
Disadvantages
l. Auxiliary DC supply is needed constituting a constant loss of
power.
2. Reliability is unpredictable.
3. Susceptible to voltage transients.
i 4- It is not very robust in construction.
5. Easily affected by surrounding interference.
Applications of static relays
Static relays are extensively used in ultra high speed protection schemes rf EHV AC lines utilizing distance protection. Also the main element of the [differential relay in ..................[:=> 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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MODBUS
- DNP 3.0
Service interface for DIGSI 4 (modem)/temperature monitoring (thermo-box)
Time synchronization via IRIG-B/DCF 77
Overall Operation
The numerical differential protection device SIPROTEC® 7UT612 is equipped with a powerful microcomputer system. This provides fully numerical processing of all functions in the device, from the acquisition of the measured values up to the output of commands to the circuit breakers. Figure 1-1 shows the basic structure of the device.
Analog Inputs
The measuring inputs MI transform the currents derived from the instrument transform..................[:=> 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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ts connected to a protected line including tapped transformers and lines. This may create a problem as the tapped connections are meant to provide a cost-effective alternative to actual substations. The taps are made outside the main substations and may not be equipped with proper protection means such a Circuit Breakers (CBs) and Current Transformers (CTs). Also, high-speed communication from the tap site may be a problem. This either limits the application of line current differential relays or makes the tapped connections economically less attractive. This paper discusses application proble..................[:=> Show Contents <=:]



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