S Of THR A./.R.R. 



1) kl-: ILLATION. 

 (I) DEFINITIONS. 



187 The .- .fa machine or apparatus in refard to some 

 cha: v (such as terminal voltage, current or speed) 



of thai quantity from its normal value at rated 



load to that normal value. The term " regulation." therefore, has the 

 same meaning as th< r emulation." occasionally used. 



188 - SM charactenstic quantity is intended to re- 

 mum constant (.f.. constant voltage, constant speed, etc.) between rated 

 load and no load, the regi the ratio of the maximum variation 



. the rated-load \ he no-load value. 



189 tic quantity it intended to vary 

 in .. t*tween rated load and no load, the regulai: 



thr the maximum variation from the specified condition to the 



rated-load va! 



190 the variation (in voltage, current, speed, etc.) 

 1 load and no load is not sp< hould be assumed to be 



a simple linear relation; i.r.. one undergoing uniform variation between 

 rated load and no load. 



191 IK. The regulation of an apparatus may. therefore differ ac- 

 cording to its qu. for use. Thus, the regulation of a compound- 

 wound generator specified as a constant-potential generator, will be dif- 



it jM>ssesses when specified as an over -compounded 

 generator. 



192 i KM i AL ! s. the regulation is the ratio of the 

 maximum difference of terminal voltage from the rated-load value (occur- 

 ring within the range from rated load to open circuit) to the rated load 



193 Ii. MINES, the regulation is the ratio of the 

 maximum difference of current from the rated-load value (occurring 



he range from rated-load to short-circuit, or minimum limit of 

 op< -ad current. 



194 It >WBK APPARATUS, the regulation is the ratio of maxi- 

 mum difference of power from the rated load value (occurring within the 

 range of operation specified) to the rated power. 



196 I: i ti> DIKK i CURRENT MOTORS and INDUCTION MOTORS 

 the of the maximum variation of speed from its 

 rated load value (occurring within the range from rated load to no-load) 

 to the rated load speed. 



198 The regulation of an induction motor re. not identical with 



which is the ratio of the drop in speed from syn- 

 ch r ronous speed. 



197 I: SSFORMERS. the regulation is the ratio of 

 the rise of secon<: voltage from rated non-inductive load to 

 no-load (at constant primary impressed terminal voltage) to the secondary 

 ten; .ige at rated load. 



198 In OvER-Court' USES, the regulation is the ratio of the 

 maximum difference in voltage from a straight line connecting the no-load 

 and rated-load values of terminal voltage as function of the Toad current, 

 to the rated-load terminal voltage. 



199 . i-kv !>, N \\IOTORS. MOTOR-GENERATORS AND FREQO 

 CONVERTERS, the regulation is the ratio of the maximum difference 

 minal voltage at the output side from the rated-load voltage, to the rated- 

 load voltage on the output side. 



200 In TRANSMISSION LINES. FEEDERS. ETC.. the regulation is the ratio of 

 the maximum voltage difference at the receiving end. between rated non- 

 inductive load and no load to the rated-load voltage at the receiving end 

 (with constant voltage impressed upon the sending end). 



201 In STEAM ENGINES, the regulation is the ratio of the maximum varia- 

 tion of speed in passing slowly from rated-load to no-load (with constant 

 steam pressure at the throttle) to the rated-load speed. For variation 

 and pulsation see Sees. 59-64. 



