Why substation battery room is coulered black?

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When we connect the large capacitor bank in series ?

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what is earthing transformer? draw the winding dia.of earthing transformer.

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what is the physical connection of a analog i/p to a analog i/p module (ab plc)and through a analog o/p module(ab plc) to a analog o/p . and how all the process control by scada

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why dc is used in control circuit for mv & hv switchgear instead of ac

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How can you measure battery AH?

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How to decide whether A / B / C / D curve type MCB should be used?

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In CT,which terminal(s1,s2) need to be grounded?

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What are all the problems occured while ac generator running in leading power factor at full load condition?

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We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?

0 Answers   Siemens,

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difference between turns ratio and transformation ratio?

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how is reactive power controlled on the transmission system

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