Advantages and Disadvantages of Different Types of Neutral ...

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HIGH RESISTANCE GROUNDING 2.4KV SYSTEM CALCULATION OF CHARGING CURRENTS 1. SURGE CAPACITORS 6 3 ICO = 3(2πf CE/10 ) = 3(2π*60*.5X(2400V/3^1/2)= 3X.261= .783 AMPS 10 6 2. MOTORS HP 3 ICO = [0.005X ( )] REF. ALVIN KNABLE RPM 450 1765 200 180 100 257 125 585 450 HP MOTOR 0.05 X = .013AMPS 200 HP MOTOR 0.05 X = .06AMPS 100 HP MOTOR 0.05 X = .02AMPS 125 HP MOTOR 0.05 X = .01AMPS 3. ZIG-ZAG TRANSFORMER – APPROXIMATE VALUE .01 TO .001 MICRO FARAD __10^6 __ XC= = 2.65 X 10^5 TO 2.65 X 10^6 OHMS 377X10^-2 3ICO= = .0156 TO .00156 AMPS. DISREGARD THIS VALUE 2400/3^(1/2) 2.65X10^5 82
HIGH RESISTANCE GROUNDING 2.4KV SYSTEM CALCULATION OF SYSTEM CHARGING CURRENT 4. CABLE CAPACITANCE C= 0.00735(SIC) _mfd_ WHERE SIG= SPECIFIC INDUCTIVE CAPACITANCE =3 LOG (D/d) 100 ft. D= DIAMETER OVER INSULATION d=DIAMETER OF CONDUCTOR AVERAGE LENGTH OF CABLE RUNS = 75 FT, #2 5KV UNSHIELDED. C= _0.00735*3_ LOG (.56.34) _75 f_ 1000 ft _____10^6_____ 377 X 7.63x10^-3 C= .1017 X = 7.63X10^-3 ufd Xc= =3.47x10^5 OHMS. 3Ico= = .0119AMPS = .012AMPS PER FEEDER __2400/ 3^(1/2)__ 3.47X10^5 OHMS 83
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Advantages and Disadvantages of Dif
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POWER SYSTEM GROUNDING Power system
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Are You at Risk? Do you use electri
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POWER SYSTEM GROUNDING SYSTEM FAILU
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Bolted Faults Result from a solid c
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Arc Fault Usually caused by insulat
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Arcing Ground Faults Intermittent o
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Industry Recommendations IEEE Std 2
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THE UNGROUNDEDED POWER SYSTEM 18
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UNGROUNDED SYSTEM NORMAL CONDITIONS
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UNGROUNDED SYSTEM GROUND FAULT ON P
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THE UNGROUNDED POWER SYSTEM GROUND
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THE UNGROUNDED POWER SYSTEM ADVANTA
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THE SOLIDLY GROUNDED POWER SYSTEM 2
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SOLIDLY GROUNDED SYSTEM THREE PHASE
Page 32 and 33: SOLIDLY GROUNDED SYSTEM LINE - GROU
Page 34 and 35: SOLIDLY GROUNDED SYSTEM LINE-LINE S
Page 36 and 37: Industry Recommendations IEEE Std 1
Page 38 and 39: THE SOLIDLY GROUNDED POWER SYSTEM D
Page 40 and 41: Reactive Grounding Uses reactor not
Page 42 and 43: LOW RESISTANCE GROUNDING OF POWER S
Page 44 and 45: LOW RESISTANCE GROUNDED ZERO SEQUEN
Page 46 and 47: HIGH RESISTANCE GROUNDING OF POWER
Page 48 and 49: No Single Phase Loads No line-to-ne
Page 50 and 51: HIGH RESISTANCE GROUNDING - GROUND
Page 52 and 53: HIGH RESISTANCE GROUNDED SYSTEM LIN
Page 54 and 55: HIGH RESISTANCE GROUNDING 54
Page 56 and 57: THE HIGH RESISTANCE GROUNDED POWER
Page 58 and 59: THE HIGH RESISTANCE GROUNDED POWER
Page 60 and 61: HOW DO YOU FIND GROUND FAULTS? Ungr
Page 62 and 63: PROCEDURE FOR LOCATING GROUND FAULT
Page 64 and 65: Fault Location Method to quickly lo
Page 66 and 67: Per IEEE… TO HRG OR NOT TO HRG? I
Page 68 and 69: Per IEEE… TO HRG OR NOT TO HRG? I
Page 70 and 71: Duty Ratings for NGR’s IEEE Std 3
Page 72 and 73: HIGH RESISTANCE GROUNDING OF A 2400
Page 74 and 75: THE HIGH RESISTANCE GROUNDING OF PO
Page 76 and 77: Resolve NEC requirement Add small 1
Page 78 and 79: Minimum Specifications 120 Volt Con
Page 80 and 81: HIGH RESISTANCE GROUNDING - 2.4KV S
Page 84 and 85: HIGH RESISTANCE GROUNDING - 2.4KV S
Page 86: GENERATOR APPLICATONS OF NEUTRAL GR
Page 89 and 90: Generator Grounding - IEEE IEEE Std
Page 91 and 92: AIC Rating (Amps Interrupting Curre
Page 93 and 94: HYBRID SYSTEM 93
Page 95: Common options Enclosure rating Enc
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