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POWER TRANSFORMER DESIGN-PRINCIPLES & INFORMATION




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Current Rank: 58 (Arts & Craft)
URL: http://www.powertransformerdesign.net/
Site Description: POWER TRANSFORMER | DISTRIBUTION TRANSFORMER | TRANSFORMER DESIGN | TRANSFORMER PRINCIPLES | TRANSFORMER THEORY | TRANSFORMER INSTALLATION | TRANSFORMER TUTORIALS
Date Joined: Feb 13, 2012

Tags: Transformer Design, Power Transformer


Latest Blog Posts

TERTIARY-WINDING OVERCURRENT PROTECTION BASIC INFORMATION
on Nov 9, 2012 in Relay Transformer Protection The tertiary winding of an autotransformer, or three-winding transformer, is usually of much smaller kVA rating than the main windings. Therefore, fuses or overcurrent relays set to protect the main windings offer almost no protection to tertiaries.



PROTECTIVE RELAY CURRENTS EXPERIENCED BY POWER TRANSFORMERS DURING FAULT CONDITIONS
on Nov 9, 2012 in Relay Fault Two characteristics of power transformers combine to complicate detection of internal faults with current operated relays a)The change in magnitude of current at the transformer terminals may be very small when a limited number of turns are shorte...



DIFFERENTIAL PROTECTION OF AUTOTRANSFORMERS USING HIGH-IMPEDANCE RELAYS BASIC INFORMATION AND TYPICAL SCHEMATIC DIAGRAM
on Nov 9, 2012 in Autotransformers Differential Relay Some utilities provide protection for large high-voltage and extra-high-voltage autotransformers by using voltage-operated bus-type high-impedance differential relays. Typical connections of this protective system for autotransformers, with the neutr...



TYPES OF POWER TRANSFORMER FAULTS BASIC INFORMATION
on Nov 9, 2012 in Relay Fault Transformer Protection The electrical windings and the magnetic core in a transformer are subject to a number of different forces during operation, for example a)Expansion and contraction due to thermal cycling b)Vibration c)Local heating due to magnetic flux d)Impac...



POWER TRANSFORMER RELAYING PHILOSOPHY AND ECONOMIC CONSIDERATIONS
on Nov 9, 2012 in Relay Power Transformer Transformer Protection Protective relaying is applied to components of a power system for the following reasons: a)Separate the faulted equipment from the remainder of the system so that the system can continue to function b)Limit damage to the faulted equipment c)Min...



PHASE SHIFTING TRANSFORMER RATING DATA REQUIREMENT BASIC INFORMATION
on Nov 5, 2012 in Phase Shifting Transformer In general, rating data for PSTs should be in accordance with the requirements for power transformers as covered in IEEE Std C57.12.00-2000 with the following exceptions or additions. Polarity, angular displacement, and terminal markings Termin...



USUAL SERVICE CONDITION OF PHASE SHIFTING TRANSFORMER
on Nov 5, 2012 in Phase Shifting Transformer Usual service conditions These conditions shall be as stated in IEEE Std C57.12.00-2000, 4.1.1 through 4.1.7, and 4.1.9; 4.1.8 shall not apply. In 4.1.6.1 (a), the word secondary shall mean the L terminals of the PST. a) The purchaser of the PST sh...



PHASE SHIFTING TRANSFORMER CONSTRUCTION
on Nov 5, 2012 in Phase Shifting Transformer In general, construction requirements for PSTs should be in accordance with the requirements for power transformers, as covered in IEEE Std C57.12.00-2000 and other applicable IEEE standards based on kV and kVA ratings, with the following exception...



PHASE SHIFTING TRANSFORMER DESIGN CRITERIA
on Nov 5, 2012 in Phase Shifting Transformer Phase angle The rated phase angle is defined under no-load conditions. However, it should be noted that the unit is unlikely to operate at this phase angle under load in the advanced position due to the effect of the voltage drop in the unit. In t...



PHASE SHIFTING TRANSFORMER SHORT CIRCUIT CHARACTERISTIC
on Nov 5, 2012 in Short Circuit Fault Phase Shifting Transformer Short Circuit Requirements  General PSTs shall comply with the short circuit requirements of IEEE Std C57.12.00-2000, unless otherwise agreed upon by the purchaser and manufacturer. Transformer categories The kVA rating to be considered for deter...



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