Single-phase generator The early generators for those single-phase traction networks are single-phase generators. Even with newer three-phase motors which were introduced to some modern trains, the single-phases transmission for traction networks survive their time and are still in use in many railways today. However, many traction power stations have replaced their generators over time to use three-phase generators and convert into single-phase for transmission. In the early development of hydroelectricity, single-phase generators played an important role in demonstrating the benefits of alternating current. In 1891, a 3,000 volts and 133 Hz single-phase generator of 100 horsepower was installed at Ames Hydroelectric Generating
History and use of the single transferable vote constituencies, while local elections currently use constituencies of between five and seven seats. For European elections Northern Ireland serves as a single three-seat constituency. Local elections in Scotland use constituencies of three or four seats. All official STV elections in the UK use the Gregory method of counting votes. STV is also used by many private organisations. For example, it is used in many British university students' unions (and promoted by the National Union of Students as the fairest way of running elections), for all elections within the University of Cambridge and for electing board members in The Co-operative Group.