754 ORGANIZATION AND OPERATION 



the first " shot " there will be a delay of from fifteen to twenty 

 seconds in bringing the speed back again, hence it is important 

 that the governor man manipulate the speed properly and be ready 

 to take the first shot when it presents itself. 



Another point is to have the field rheostat in the proper 

 position for normal voltage, so that no time is lost in manipu- 

 lating the voltage. In cases of serious emergency where there 

 have already been interruptions to service or serious fluctuations 

 of voltage, or where the hydro-electric plant has separated from 

 the steam plant, the operator is instructed to parallel without the 

 use of the synchroscope, in order to save time. In this case he 

 opens the field of the incoming generator while closing its oil 

 switch and immediately closes the field afterwards. Under the 

 special conditions of high reactance of the units employed in the 

 plant described, this results in a 5 to 8 per cent fluctuation in 

 voltage in case the incoming unit (of approximately 10,000-kw. 

 capacity) is 20 per cent less than the capacity already tied in on 

 the bus. 



Maintenance. The first task was to get up a machinery index 

 wherein is listed the station apparatus. A letter size sheet, or 

 several of them, are devoted to each piece of apparatus and upon 

 these sheets are noted data or reference directions in regard to the 

 apparatus, also references to a machinery repair log book, where 

 may be obtained detailed information with regard to the repair 

 history of the piece of apparatus. 



In regard to the maintenance of the station, the operating 

 attendants do a large amount of this work and practically all of 

 the inspection. Instructions for cleaning and inspection have 

 been very carefully drawn up and the operating men instructed 

 in the proper care of the apparatus. Every piece of apparatus 

 in the station has been considered individually and it has been 

 determined just how often it needs to be inspected and how 

 thorough an inspection is needed. All the equipment is tabulated 

 on charts, which show the periodicity of the inspections and 

 provide spaces which are to be filled in with the date and initials 

 of the attendant who made the inspection. These charts are 

 posted on the wall in a conspicuous place and make an excellent 

 graphical record of the status of the inspections of the entire 

 station up to date. Any delayed inspections are, naturally, 

 inquired into. 



