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  • Users: SSKLC
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  1. SSKLC

    Sensitivity of High impedance busbar differential protection

    We have 6.6kV, 2500Amp, 40kA Switchgear fed through 33/6.9kV, 22/27.5MVA, ONAN/ONAF Transformer. The transformer neutral is earthed through 400Amp, 30 sec. NER. The 6.6kV Switchgear has Bus differential protection vide ABB REF615_N for each bus section. We have checked sensitivity of Bus...
  2. SSKLC

    Motor Hot withstand time

    Motor Specification from one of the reputed consultant in India states following : For motors with starting time upto 20 secs at minimum permissible voltage during starting, the locked rotor withstand time under hot condition at highest voltage limit shall be at least 2.5 sec more than starting...
  3. SSKLC

    Cable Sizing Calculation for Star Delta Starter

    Hi, I am trying to size cables from Star Delta Starter to Motor During Star connection, Load Current in Cable from SWGR – Motor Term. U1, V1, W1 = 1/3 (33%) of actual FLC Load Current in Cable from SWGR – Motor Term. U2, V2, W2 = 1/3 (33%) of actual FLC Starting Current in Cable from SWGR –...
  4. SSKLC

    Contactor Economizing Module

    Hi, We are experiencing peculiar problem at site, which is causing our process plant to trip. Our plant has 2.3kV MCC where motor feeders uses the GE Limitamp Contactor (CR193V), which were retrofitted with Vacuum bottle in past. During retrofitting, Contactor Economizing Module (CEM) were...
  5. SSKLC

    Cable Ampacity Adjustment for touching Multiconductor cables

    Hi Guys, I have following query regarding NEC code requirements for cable ampacity derating. We have following situation for calculation of motor cable sizes for cables leaving from one of the MCC in Substation. Cable Laying Condition: Uncovered Cable Tray Nos. of Power Cables in tray...

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