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  1. Haroon Baloch

    Secondary Voltage of Broken Delta VT for 67N Protection of a Grounded Wye System

    I'm working on a 4.16kV, 40kA-3sec, 4000A Switchboard. We need Directional Earth Fault (67N) protection on the Generators. The relay manual (Siemens 7SR2..) mentions that the polarizing quantity for the directional protection can be "calculated from the 3 phase voltage inputs or the 3Vo input"...
  2. Haroon Baloch

    What does "Neutral Protection of 50%, or 100%, of the phase setting" in ABB MCCBs mean?

    In all 4-pole ABB MCCBs, above a certain range, it is mentioned that that there is an option to choose 50% or 100% Neutral protection. Specifically, it says "The four-pole circuit-breakers are always supplied with the neutral protected by the trip unit and with protection of the neutral at 100%...

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