EC&M’s Electrical Calculations Handbook - Chapter 4 potx

... 90 2 1-2 5 7 0-7 7 1.08 1.05 1. 04 2 6-3 0 7 8-8 6 1 1 1 3 1-3 5 8 7-9 5 0.91 0. 94 0.96 3 6 -4 0 9 6-1 04 0.82 0.88 0.91 4 1 -4 5 10 5-1 13 0.71 0.82 0.87 4 6-5 0 11 4- 1 22 0.58 0.75 0.82 5 1-5 5 12 3-1 31 0 .41 0.67 0.76 5 6-6 0 ... 0.78 6 26. 24 0.051 0.051 0.0 64 0 .49 0 .49 0 .49 4 41. 74 0. 048 0. 048 0.06 0.31 0.31 0.31 3 52.62 0. 047 0. 047 0.05...

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... VECTOR 180 - 37 .4 AMP 20.9 -1 6.6 +j 12.7 (-X, +J) (+X, +J) (-X, -J) (+X, -J) Step 3. Draw the resultant vector. +X +J -J (-X, -J) NEW RESULTANT VECTOR -1 6.6 +j 12.7 180 ° - 37 .4 ° AMP 20.9 (-X, ... scalars together and add angles. V = (0.6 -1 6 .4 ° ) x (0.6 -1 6 .4 ° ) V = (0.6 x 0.6) (-1 6 .4 ° + (-1 6 .4 ° )) units V = 0.36 -3 2.8 ° units Figure 3-...

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... 13.8-kV bus. Fault power is available to flow into this bus from 1. The electrical utility source 2. The 2 4- megawatt (MW), 30-MVA generator 3. The 5000-hp motor 4. The 200-hp motor 5. The 40 -hp ... 30-MVA generator 3. The 5000-hp motor 4. The motors connected to the 48 0-V bus Short-Circuit Calculations 191 Figure 5-1 Electrical power system one-line drawing for short-circuit c...

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... such as a 46 0-volt (V), three-phase, three-wire delta system, an arc- ing fault that repeatedly restrikes can cause voltage “jack- ing” of up to six times the normal system phase-to-neutral voltage. ... enough equipment-grounding conductors, as shown in Fig. 7 -4 . Since system grounding is done at the service-disconnect- ing means, the equipment-grounding conductor and the neu- tral (“gro...

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... must be placed i ᎏᎏ (1 ϩ i) n Ϫ 1 42 0 Chapter Fifteen Figure 1 5-2 3 Solve for the cash-flow diagram of a loan transaction at interest. Figure 1 5-2 4 Solve for the cash-flow diagram of a recurrent savings ... the job site is in Electrical Cost Estimating 40 9 Figure 1 5-7 Aluminum rigid conduit installation personnel hours. 387 40 4 Electrical Cost Estimating Determining...

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... Value of Money 41 1 Chapter 16. Conversion Calculations 42 5 Temperature Conversion Calculations 42 5 Frequently Used Conversion Calculations 42 5 Multiple Conversion Calculations 42 5 Index 43 3 Contents ... Solve for 4- 1 Copper wire characteristics 4- 3 3 Correction factor for more than three current-carrying conductors in raceway 4- 3 8 Cross-sectional areas of most...

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... Volt, 3-phase 4- wire wye Note 5 46 0 Volt, 3-phase 3-wire delta Note 4 600/ 347 Volt, 3-phase, 4- wire wye 240 0 Volt, 3-phase, 3-wire delta 240 0 Coltm 3-phase, 4- wire wye 41 60/ 240 0 Volt, 3-phase, 4- wire ... 4- wire wye 1 247 0/7200 Volt, 3-phase, 4- wire wye Note 6 249 40/ 144 00 Volt, 3-phase, 4- wire wye Note 8 345 00/19920 Volt, 3-phase, 4- wire wye Note 9 46 000 6...

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... power conductors and generator overcurrent pro- 200 Chapter Six Gas-turbine generators arrive at the installation site prepackaged on skids. Figure 6-2 Solve for generator overcurrent protection ... horsepower is limited by the heat content of the fuel. For example, in dual-fuel recipro- cating engines, the engine can produce about 40 percent more power from diesel fuel than it can from...

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... necessary to use the point-by-point method. The Point-by-Point Method How to make point-by-point calculations Later in this chapter, lighting calculations within areas hav- ing reflective surfaces, ... perpendicular to the lamp. 248 Chapter Eight Figure 8-3 Zonal cavity calculation worksheet. 241 Figure 8-2 Common lamps and their characteristics. 2 34 Footcandles ϭ The left s...

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... coil. 272 260 Figure 9-1 0 Table replicating part of NEC Table 45 0-3 (a), overcurrent protec- tion of transformers over 600 V. 2 74 Figure 9-1 2 Table replicating part of NEC Table 45 0-3 (b), overcurrent protec- tion ... Fig. 9-1 5b. Note that the output voltage is either 240 V ϩ 24 V, or 2 64 V, or 240 V Ϫ 24 V, or 216 V, depending on whether the sec- ondary is connected...

Ngày tải lên: 13/08/2014, 02:21