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 Overexcitatio
Transformer differential relay for autotransformer. Differential relay RADHA or RADSG for autotransformer. ASS Relays Power transformer protection AGO3-5005 E Page 3 1. INTRODUCTION To prevent faults and to minimize the damage in case ot a fault, transformers are equipped with both protective relays and monitors. ...
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