Transcription of Power Transformer Protection - ABB
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Power Transformer Protection - ABB
A GO3-5005 EMarch 1988 Power Transformer ProtectionApplication GuideAuthorR NylenSenior application engineer)ABB RelaysPower Transformer protectionAGO3-5005 EPage 2 List of contents)1. INTRODUCTION2. CONDITlONS LEADING TO FAUL Insulation Aging of Overheating due to Oil contamination and Reduced cooling3. FAULT Ground faults in a solidly groundedstar-connected secondary Ground faults in a high impedancegrounded star-connectedsecondary Ground faults in a Turn-to-turn Phase-to-phase faults4. PROTECTIVE RELA Differential Differential relays for fully Differential relays for Overcurrent Protection andimpedance Time-overcurrent Under-impedance Distance Grou~d fault Low irrnpedance residualovercurrent Harmonic restraint High impedance restricted Low impedance restricted Tank Residual voltage Overexcitation Flashover and ground faultprotections for low voltage Systems without rectifiers orfrequency Systems with rectifiers andfrequency converters withoutpulse' Systems with rectifiers and pulse-width-modulated frequencyconverters5.
Ground fault current in a solidly grounded Y-connected winding. Ground fault current in a high impedance grounded Y-connected winding. Theoretical inrush currentlm. Recorded inrush current for a 60 MV A transformer 140/40/6.6 kV. connected YNyd. Operating time. Through faun restraint. Magnetizing current at overexitation.
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