YOKOGAWA wt3000 User Manual

App-2 IM 760301-01E
WP
WP+
WP–
Measurement Functions
during Normal
Measurement
Watt
hour
[Wh]
N is the number of samples over the integration time. The time unit is h.
WP is the sum of positive and negative watt hours.
WP+ is the sum of positive P (consumed watt hours).
WP– is the sum of negative P (watt hours returned to the power supply).
Integration
Σ
function
q
q+
q–
Integration time
[h:m:s]
Time from integration start to integration stop.
(Table 2/3)
Single-phase,
two-wire 1P3W
Three-phase,
three-wire 3P3W
Three-phase, three-wire (three-voltage,
three-current)
3P3W (3V3A)
Three-phase,
four-wire 3P4W
P1 + P2 + P3
PΣ [W]
P1 + P2
UΣ [V]
IΣ [A]
Wiring system
(U1 + U2) / 2
(I1 + I2) / 2
(U1 + U2 + U3) / 3
(I1 + I2 + I3) / 3
S1 + S2
(S1 + S2 + S3)
3
3
(S1 + S2)
2
3
SΣ [VA]
S1 + S2 + S3
Q1 + Q2
Q1 + Q2
QΣ [var]
Q1 + Q2 + Q3
Q1 + Q2 + Q3
Pc1 + Pc2 + Pc3
Pc1 + Pc2
PcΣ [W]
Ampere hour
[Ah]
Volt-ampere-hour
WS [VAh]
Var-hour
WQ [varh]
RMS,
MEAN,
RMEAN
DC
TYPE1,
TYPE2
TYPE3
TYPE1
TYPE2
TYPE3
I(n) is the n
th
measured current value.
N is the number of data updates.
The time unit is h.
I(n) • Time
n = 1
N
1
N
S(n) is the n
th
measured apparent power value, and N is the number of data updates.
S(n) • Time
n = 1
N
1
N
Q(n) is the n
th
measured reactive power value, and N is the number of data updates.
i(n) • Time
n = 1
N
1
N
i(n) is the n
th
sampled data of the current signal.
N is the number of data samples.
q is the sum of positive and negative ampere hours.
q+ is the sum of positive i(n) (ampere hours).
q- is the sum of negative i(n) (ampere hours).
The time unit is h.
PΣ
2
+ QΣ
2
SΣ
2
- PΣ
2
Method of Determination, Equation
For details on the symbols in the equation, see the Note on page App-3.
u(n) • i(n) • Time
n = 1
N
1
N
Q(n) • Time
n = 1
N
1
N
(Continues to the next page)
Appendix 1 Symbols and Determination of Measurement Functions

YOKOGAWA wt3000 Specifications

General

Brand	YOKOGAWA
Model	wt3000
Category	Measuring Instruments
Language	English