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| WEPWI005 |
Novel Approach to Variable Voltage Substation Protection |
3496 |
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- M.Y. Mehtabuddin, C. Jach, S. Olek
SLAC, Menlo Park, California, USA
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Conventional electrical system protection of variable voltage substations(medium voltage rated) of using fuses and phase overcurrent and/or phase time overcurrent protection is not adequate. This was evident from the recent variable voltage substation (VVS) electrical fire at SLAC. Using information obtained from the fire investigation, ETAP simulations, and event reports of the faults which led to the fire, SLAC put into action a fast, feasible, and economical relay protection plan into adequately protecting VVS until long term plan of replacements is implemented. The plan utilizes the existing microprocessor protection relays on the upstream vacuum breakers and included the following adjustments: Adjusting the long time overcurrent according to the de-rated cable ampacities, dual-fed arc flash fault protection, adding negative sequence settings and relay control logic to allow for two sets of settings for inrush mode and normal mode.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWI005
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