Advantages and Disadvantages of Different Types of Neutral ...
Advantages and Disadvantages of Different Types of Neutral ...
Advantages and Disadvantages of Different Types of Neutral ...
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HIGH RESISTANCE GROUNDING 2.4KV SYSTEM<br />
CALCULATION OF CHARGING CURRENTS<br />
1. SURGE CAPACITORS<br />
6<br />
3 ICO = 3(2πf CE/10 ) = 3(2π*60*.5X(2400V/3^1/2)= 3X.261= .783 AMPS<br />
10 6<br />
2. MOTORS<br />
HP<br />
3 ICO = [0.005X ( )] REF. ALVIN KNABLE<br />
RPM<br />
450<br />
1765<br />
200<br />
180<br />
100<br />
257<br />
125<br />
585<br />
450 HP MOTOR 0.05 X = .013AMPS<br />
200 HP MOTOR 0.05 X = .06AMPS<br />
100 HP MOTOR 0.05 X = .02AMPS<br />
125 HP MOTOR 0.05 X = .01AMPS<br />
3. ZIG-ZAG TRANSFORMER – APPROXIMATE VALUE .01 TO .001 MICRO FARAD<br />
__10^6 __<br />
XC= = 2.65 X 10^5 TO 2.65 X 10^6 OHMS<br />
377X10^-2<br />
3ICO= = .0156 TO .00156 AMPS. DISREGARD THIS VALUE<br />
2400/3^(1/2)<br />
2.65X10^5<br />
82
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