RATING OF ELECTRICAL AM< ///.YA*K 



MECHASICAL TESTS 



BEI ) capable of withstanding for five minutes, 



at no load with and 



he maximum speed specif>< 

 nature or method of using the ma. 



ceeding this figure, in which case the excess must be 100 per 

 PRANCE. Generators must be capable of withstanding a morm 

 ae in speed to | ase. according 



not or* n. 



standing, during five minutes, a speed of 20 per cent in excess of the r 

 .,,-, i 



tors must be capable of withstanding, 

 a speed of 3<> in excess of the rated apted. 



Gut" .led to work ,. ally con- 



must be cap * during five minute*, a Speed < 



in excess of the rated speed, first * 



. \r Hkii N 



SWEDEN. Machines must be capable of withstanding a speed of 20 

 per cent in excess of speed. Generators driven by hydraulic 



turbines, unless otherwise specified, must be capable of withstanding a 

 peed of 00 per \cess of the rated speed. 



t MTBD STATES. 



El cT 



*dtttO*S 



BELGIUM. The n determination is to be specified. Unless 



to be ascertained at rated load and under 

 the corresponding conditions as to temperature. 



liower absorbed in the i. .its of a machine is to be included 



as part of the power the machine. In the case of a 



of the machine and that 

 exciter, shall be separately stated. 



PRANCE. The eft. us should be made at. or reduced to. the 



temperature attu: >se of the working test. The efficiency 



shall be state rated load, three-quarters and half load, and is to 



include the ! line ' :y apparatus such as ex -tla- 



tion. :ig pumps, forming an integral portion of the plant. 



GBRV ,-tit as to U. y applies to the rated 



load and the s of serv rs ts to be mentioned. 



The power absorb- a and in ihe rheostats must be consid* 



as losses for of the unless otherwise stated the 



power absorbed in cooling the machine must also be considered as a loss, 



Por which are specially excited, the efficiency of the two 



machines must be stated separat. 



GREAT BRII 



SWEDES. The losses in excitation and in the rheostats are to be in* 



Friction losses are only to be included in the case of machines with 

 automatic lul 



Losses due to an el are to be excluded. 



The cfliv ts are to be made <* mperaturv 



attained by the machine at the close of the rated load test and referred 

 to a surrounding air temperature of 20 deg. cent. 



t'siuj) Si MRS. The test is to be carried out under ordinary work- 

 ing conditions and with the surrounding air at standard temperati: 



In the case of belt-driven machines, the loss of power in belts and the 

 increase of bearing friction, due to the increase of belt tension, is to be 

 excluded. 



