Lightning versus Switching Impulse Requirements for Transformers
Lightning impulse and switching impulse repre…
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Surge Arresters at Transformer Terminals: Location Matters
Surge-arrester protective level alone does no…
阅读全文Transformer BIL and LI Ratings: Read the Applicable Terminology
BIL is IEEE terminology for a lightning-impul…
阅读全文Protection Changes after Transformer Uprating
Transformer uprating can change permissible l…
阅读全文Transformer Breaker-Failure Schemes: Define Upstream Trip Dependencies
Breaker-failure protection is a dependency sc…
阅读全文Inrush Restraint in Differential Relays: Why One Harmonic Ratio Is Not Universal
Inrush restraint cannot be reduced to one uni…
阅读全文Buchholz, Pressure Relief and Differential Protection: Different Detection Paths
Buchholz relays, pressure-relief devices and …
阅读全文Overexcitation Protection: Data Needed for a V/Hz Curve
Overexcitation is fundamentally a volts-per-h…
阅读全文Transformer Thermal Protection: Match the Model to the Cooling State
A thermal protection model must follow the tr…
阅读全文Overcurrent Coordination around a Distribution Transformer
Overcurrent coordination around a distributio…
阅读全文Restricted Earth-Fault Protection: Define the Protected Neutral Zone
Restricted earth-fault protection covers a de…
阅读全文CT Saturation in Transformer Differential Schemes
CT saturation can create false differential c…
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