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IEEE PC57.109 DRAFT
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IEEE PC57.109 DRAFT 2018 Edition, March 1, 2018 Draft Guide for Liquid-Immersed Transformer Through-Fault-Current Duration
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Description / Abstract:
This guide applies to transformers referenced in IEEE Std C57.12.00 [B3] as Categories I, II, III, and IV. It sets forth recommendations essential for the application of overcurrent protective devices applied to limit the exposure time of transformers to short-circuit currents (see IEEE Std C37.91 [B2]).1 This guide is not intended to imply overload capability.
Purpose
Protective devices such as relays and fuses have well-defined operating characteristics that relate fault magnitude to operating time. These characteristic curves should be coordinated with a comparable curve(s) applicable to transformers that relate duration and fault magnitude to withstand capability.
Purpose
Protective devices such as relays and fuses have well-defined operating characteristics that relate fault magnitude to operating time. These characteristic curves should be coordinated with a comparable curve(s) applicable to transformers that relate duration and fault magnitude to withstand capability.