17-2
IM DL850E-01EN
• Configuration Example of Wiring System and Wiring Unit
Single-phase two-wire
Three-phase three-wire
Σ
Wiring system
Wiring unit
Souece
Channel 1
Voltage input
CH1
CH2
Source
Channel 2
CH3
CH4
Source
Channel 3
720210
(HS100M12)
example
CH5
CH6
Current input
(using current probes)
Delta Math
Measurement function ΔU and ΔI can be determined based on the sum and difference of the instantaneous
voltage and current (sampling data) of the source channels assigned to the wiring unit set as the delta math
source. This calculation is called
delta math
.
3P4W→3V3A
• Using the data of a three-phase four-wire system, delta connection data can be calculated from star
connection data (star-delta transformation).
R
S
T
R
S
T
3V3A→3P4W
• Using the data of a three-phase three-wire system (three-voltage, three-current method), star connection
data can be calculated from delta connection data (delta-star transformation). This is useful when you want to
observe the phase voltage of a measurement source without a neutral line.
R
S
T
R
S
T
Measurement Function Types
• Source channel measurement functions
The following 32 measurement functions are available.
U (voltage): Urms (rms value),* Umn (rectified mean value calibrated to the rms value),* Udc (simple
average), Uac (AC component)
I (current): Irms (rms value),* Imn (rectified mean value calibrated to the rms value),* Idc (simple average), Iac
(AC component)
P (active power), S (apparent power), Q (reactive power), λ (power factor), φ (phase difference), fU (voltage
frequency),
fI (current frequency), U+pk (maximum voltage), U-pk (minimum voltage), I+pk (maximum current), I-pk
(minimum current), P+pk (maximum power), P-pk (minimum power), WP (integrated power), WP+ (positive
integrated power),
WP- (negative integrated power)
q (integrated ampere-hour), q+ (positive integrated ampere-hour), q- (negative integrated ampere-hour), WS
(volt-ampere hours), WQ (var hours),
Z (impedance), RS (series resistance), XS (series reactance), RP (parallel resistance), XP (parallel reactance)
* You can select either the rms value or the rectified mean value calibrated to the rms value (but not both). In
either case, the value is displayed as rms.
17 Power Math