Answer / bilal hamad

1- to isolate supply and load in case of faults and power harmonics (to protect the source) and also to protect the load .

2-KWH: the real power (useful) consumption per hour.
KVAH: the total power consumption per hour.
KVA: the total power (real and imaginary)(vectors sum).
KVARH: the imaginary power consumption per hour.

in summary: the power factor will control the amount of real (active)power and reactive power. all real loads are usually inductive loads or resistive, this will reduce the power factor and then increase the reactive power, the solution is to install capacitor banks to increase the power factor and then reduce the reactive power so increase the active power.

3. CT: is a step down current transformer used for current measurement and protection.
PT or VT: is a step down voltage transformer used for voltage measurement.

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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?

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