Re-Design of the Transmission System of the Edison Electric Company of Southern California
Re-Design of the Transmission System of the Edison Electric Company of Southern California
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Smaller 9 25 Cycles* 60 Cycles* charging current • Induction motors have "better power factor.
Mixed load can be han- dled better.
25 cycles was selected as the best frequency for this case. It was also decided to use rotary coinrertors for getting 600 volt, direct current for railway purposes f and synchronous motor-generator sets for carrying the lighting load. 62^2 cycles was selected instead of 60 for the lighting circuits "because of the greater varie- ty of possible motor-generator speeds.... With 25 to 60 cycle motor generator sets the only possible speeds are the sub-multiples of 300 while, if 62^2 cycles is used the available speeds are the sub -multiples of 750.
Standard 60 cycle apparatus can be used on the 62^2 cy- cle circuits since, at the slightly higher frequency the core loss and magnetizing current of transformers, etc. will be less, and the increase in frequency is not enough to interfere with such small motors as might be operated from the lighting circuits.
Before considering the question of voltage it 10 will be necessary to decide upon the scheme of trans- former connections to be used, since the cost of trans- formers depends upon their voltage, which in turn de- pends upon whether star or delta connection of the high- tension windings is to he used* The scheme decided up- on was star connection on the high-tension side and del- ta on the low, with the high-tension neutral grounded* It has many advantages over other combinations of star and delta connections.
What to read after Re-Design of the Transmission System of the Edison Electric Company of Southern California?
You can find similar books in the "Read Also" column, or choose other free books by Frank K Brainard to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Smaller 9 25 Cycles* 60 Cycles* charging current • Induction motors have "better power factor.
Mixed load can be han- dled better.
25 cycles was selected as the best frequency for this case. It was also decided to use rotary coinrertors for getting 600 volt, direct current for railway purposes f and synchronous motor-generator sets for carrying the lighting load. 62^2 cycles was selected instead of 60 for the lighting circuits "because of the greater varie- ty of possible motor-generator speeds.... With 25 to 60 cycle motor generator sets the only possible speeds are the sub-multiples of 300 while, if 62^2 cycles is used the available speeds are the sub -multiples of 750.
Standard 60 cycle apparatus can be used on the 62^2 cy- cle circuits since, at the slightly higher frequency the core loss and magnetizing current of transformers, etc. will be less, and the increase in frequency is not enough to interfere with such small motors as might be operated from the lighting circuits.
Before considering the question of voltage it 10 will be necessary to decide upon the scheme of trans- former connections to be used, since the cost of trans- formers depends upon their voltage, which in turn de- pends upon whether star or delta connection of the high- tension windings is to he used* The scheme decided up- on was star connection on the high-tension side and del- ta on the low, with the high-tension neutral grounded* It has many advantages over other combinations of star and delta connections.
What to read after Re-Design of the Transmission System of the Edison Electric Company of Southern California?
You can find similar books in the "Read Also" column, or choose other free books by Frank K Brainard to read onlineMoreLess
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