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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 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, however, pickup on close external faults on the HV system. Under such conditions, however, the differential system would see increased restraint current due to the through fault current. In add..................[:=> 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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ase computation.The inaccuracies of such a current differential protectionscheme arises primarily due t..................[:=> 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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ING FIRMS

REPORT SUBMITTED IN PARTIAL FULFILLMENT OF REQUIREMENT
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 acti..................[:=> 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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distribution transformer applications. Logic schemes have been developed to provide distribution bus fault protection, digital feeder relay backup protection and load shedding at two-bank 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 Sub..................[:=> 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 i.e steps to achieve the project u..................[:=> 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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closes its contacts, the auxiliary element connected across the secondary winding on the electromagnet operates, one normally open contact of the auxiliary element reinforces the disc contact. Two other contacts of the auxiliary element are brought out to the terminals of the relay
The relay operating time can be adjusted by movement of the disc backstop which is controlled by rotating a knurled moulded disc at the base of the graduated time multiplier scale.
A high-set instantaneous over current / earth fault unit, type CAG 17 can be fitted in the same case to provide instantaneous protect..................[:=> 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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nt transformers, into the protection device. Once the vector group has been entered, the protection is capable of performing the current comparison according to fixed formulae. Conversion of the currents is performed by programmed coefficient matrices which simulate the difference currents in the transformer windings. All conceivable vector groups (including phase exchange) are possible. In this aspect, the conditioning of the starpoint(s) of the power transformer is essential, too.
Isolated Starpoint
Figure 2-15 illustrates an example for a power transformer Yd5 (wye-delta with 150 ÂÂ..................[:=> 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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itudes:


Pickup and slope are the settings.
4.2. An External AG Fault at ALPHA
The following phasors are measured by the relays (from the short-circuit studies):

The differential currents calculated by a traditional phase-segregated current differential relay are:

If, however, the zero-sequence currents are removed from the differential signal then the spurious differential error signals are significantly reduced:


As seen from the example, removal of the zero-sequence current brings the currents almost to a perfect balance on this external fault. The remaining spurious d..................[:=> Show Contents <=:]



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