298
Measurement of main circuit voltages,
currents and powers
6.2 Measurement of main circuit voltages, currents and powers
6.2.1 Measurement of voltages and currents
b.$,5&0"5&4(70#/5-&#$9&,)++5$0-&($&0"5&.$45+05+&8(C5+&-)887'&#$9&()08)0&-.95-&.$,7)95&"#+?($.,-B&?5#-)+5?5$0
9#0#&9585$9-&($&0"5&.$-0+)?5$0-&)-59&#$9&,.+,).0-&?5#-)+596
P"5$& .$-0+)?5$0-& *(+& ,(??5+,.#7& *+5K)5$,'& #+5& )-59& *(+& ?5#-)+5?5$0B& ?5#-)+5& 0"5& *(77(C.$/& ,.+,).0-& C.0"& 0"5
.$-0+)?5$0-&/.45$&($&0"5&$5@0&8#/56
z P"5$&.$-0#77.$/&?505+-&50,6&($&0"5&.$45+05+&()08)0&-.95
P"5$&0"5&.$45+05+<0(<?(0(+&C.+.$/&75$/0"&.-&7#+/5B&5-85,.#77'&.$&0"5&`>>a&,7#--B&-?#77<,#8#,.0'&?(957-B&0"5&?505+-
#$9& S!-& ?#'& /5$5+#05& "5#0& 9)5& 0(& 7.$5<0(<7.$5& 75#%#/5& ,)++5$06& !"5+5*(+5B& ,"((-5& 0"5& 5K).8?5$0& C".,"& "#-
5$()/"M(C#$,5&*(+&0"5&,)++5$0&+#0.$/6
P"5$&?5#-)+.$/&#$9&.$9.,#0.$/&0"5&()08)0&4(70#/5&#$9&()08)0&,)++5$0&(*&0"5&.$45+05+B&.0&.-&+5,(??5$959&0(&)0.7.V5
0"5&L1<^&#$9&SL<^&05+?.$#7&()08)0&*)$,0.($&(*&0"5&.$45+05+6
$]<B?%&=#-@#O&<=7)*1L#/-*1(=#<1;#51=()7B&1(=
+-
Ar
As
At
Vr
Vs
Vt
W11
W12
W13
Au
Av
Aw
Vu
Vv
Vw
W21
W22
V
U
V
W
Inverter
Three
phase
power
supply
To the motor
Instrument
types
Input voltage
Input current
Output voltage
Output current
: Moving-iron type
: Electrodynamometer type
: Moving-coil type
: Rectifier type
R/L1
S/L2
T/L3
P/+
N/-