handbook for electrical engineers (17)

... used for r in Eq. (18-2). r ϭ 0.528 for 7 strands, r ϭ 0.5585 for 19 strands, r ϭ 0.5675 for 37 strands, where r ϭ equivalent radius, in, and A ϭ area of metal, in 2 . Frequency is 60 Hz for the ... in ohms per 1000 ft for com- mon sizes of wire and cable. The values can be expressed in the form ˜ Z ϭ R ϩ jX, which can be converted to the form Z if desired. The latter form is con...

Ngày tải lên: 21/03/2014, 12:12

... case. 3.1.8 Instrument Transformers The material that follows is a brief summary of information on instrument transformers as measure- ment elements. For more extensive information, consult American ... C57.13, Requirement for Instrument Transformers; American National Standards Institute; American National Standard C12, Code for Electricity Metering; Electrical Meterman’s Handbook,...

Ngày tải lên: 21/03/2014, 12:12

... Designation. America uses, for sizes up to 4/0, mil, decimals of an inch, or AWG numbers for solid conductors and AWG numbers or circular mils for stranded conductors; for sizes larger than 4/0, ... elastic deformation and permanent deformation. When a material is subjected to stress and undergoes deformation but resumes its original shape and dimensions when the stress is removed, th...

Ngày tải lên: 21/03/2014, 12:12

... therefore make more effi- cient use of coal. Postcombustion control processes are widely used for the capture of sulfur and particulate. Lime- based scrubbers for SO 2 removal and equipment for ... reserved. Any use is subject to the Terms of Use as given at the website. Source: STANDARD HANDBOOK FOR ELECTRICAL ENGINEERS 5-20 SECTION FIVE where F ϭ fuel nuclide, mass number m n...

Ngày tải lên: 21/03/2014, 12:12

... Standard Handbook of Powerplant Engineering. New York: McGraw-Hill. Kiameh, Philip. 2003. Power Generation Handbook. New York: McGraw-Hill. 2003. Marks’ Electronic Standard Handbook for Mechanical Engineers. ... reserved. Any use is subject to the Terms of Use as given at the website. Source: STANDARD HANDBOOK FOR ELECTRICAL ENGINEERS TABLE 6-3 Heat-Rate Variation with Heater...

Ngày tải lên: 21/03/2014, 12:12

... constant K is 234.5°C for copper, 242°C for silver-alloyed copper used for hollow conductors, and 225°C for electrical conductivity aluminum. Discharge coolant method. For directly cooled armature ... number of slots per pole per phase g ϭ electrical angle between slots q s ϭ electrical angle of skew Here, the relevant angles are stated in electrical terms. The electrical...

Ngày tải lên: 21/03/2014, 12:12

... armature-core length, in K 1 ϭ 18.5 for noncommutating-pole machines ϭ 0 for machines with commutating-pole length ϭ L r K 2 ϭ 1.0 for machines using nonmagnetic bands ϭ 1.7 for machines using magnetic ... reserved. Any use is subject to the Terms of Use as given at the website. Source: STANDARD HANDBOOK FOR ELECTRICAL ENGINEERS 8-20 SECTION EIGHT Direct-current motor speeds...

Ngày tải lên: 21/03/2014, 12:12

... main step-up transformer. Smaller plants may only have provision for switching via a switchyard breaker on the high voltage side of the step-up transformer, the generator and transformer being connected ... NINE Transformers associated with hydroelectric generation may differ somewhat from those used in transmission and distribution applications. For example, it is not uncommon for a si...

Ngày tải lên: 21/03/2014, 12:12

... extensively for grounding transformers, the sole purpose of which is to establish a neutral point for grounding purposes; therefore no other windings are required. 10.1.3 Power Transformers Power transformers ... at the website. Source: STANDARD HANDBOOK FOR ELECTRICAL ENGINEERS through the oil ducts of the coil. For such cases, E is best evaluated by comparison with performanc...

Ngày tải lên: 21/03/2014, 12:12

... examined. Market forecasts are provided for capacity, new projects, and annual revenue for the 2002 to 2008 time frame. The fore- casts cover national, regional, and world markets for both single-site ... Fig. 11-6. By finding the TSR for maximum C p , we can calculate the rotor speed for a given wind speed that will give best performance for this machine. It will therefore mark t...

Ngày tải lên: 21/03/2014, 12:12