Alstom iSTAT M232 - Instrumentation; Measurements

User Manual M2x2/EN M/F
iSTAT M2x2 Page 15
Connection Type
TABLE 8-2 : BASIC
Parameter Unit
MEASUREMENTS
1b 3b 3u 4b 4u
MD current I
1
I1 A
    
MD current I
2
I2 A ×
   
MD current I
3
I3 A ×
   
MD active power P (positive) P+ W
    
MD active power P (negative) P− W
    
MD reactive power Q−L Q var
    
MD reactive power Q−C Q var
    
Max. values MD
MD apparent power S S VA
    
Key  –measured,  − calculated, × − not supported
NOTE: For 3b and 3u connection mode, only phase−to−phase voltages are
measured. Because of that, factor 3 is applied to calculation of
quality considering nominal phase voltage.
For 4u connection mode measurements support is same as for 1b.
7.2 Power mode
The po
wer mode is used for the signing of power measurements. The user cannot set the
M2x2 power mode. It is defined as follows:
 When displaying active power, a positive sign indicates export power
(a consumer) whilst a negative sign indicates import power (a generator).
 When displaying reactive power, a coil symbol indicates an inductive load
(a consumer) whilst a capacitor symbol indicates a capacitive load
(a generator).
7.3 Operating energy quadrants
The
operating energy quadrants are used to determine which types of energy are added to
the energy counters. The user may modify the operating energy quadrants via the remote
communications interface or by using the front menu and buttons.