YOKOGAWA WT500, Руководство пользователя

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App-2
IM 760201-01E
WP
WP+
WP–
Measurement Functions
Used in Normal
Measurement
Watt hours
[Wh]
{
u(n)
•
i(n)
}
]
•
Time
n = 1
N
q
q+
q–
Integration time
[h:m:s] Time
Time from integration start to integration stop.
(Table 2/3)
Single-phase,
three-wire
1P3W
Three-phase,
three-wire
3P3W
Three-phase, three-wire
with three-voltage,
three-current method.
3P3W(3V3A)
Three-phase,
four-wire
3P4W
P1 + P2 + P3 P
S
[W] P1 + P2
Wiring system
S1 + S2
(S1 + S2 + S3)
3
3
(S1 + S2)
2
3
S
S
[VA]
S1 + S2 + S3
Q1 + Q2
Q1 + Q2
Q
S
[var]
Q1 + Q2 + Q3
Q1 + Q2 + Q3
Ampere
hours
[Ah]
Volt-ampere hours
WS[VAh]
Var hours
WQ[varh]
RMS,
MEAN,
RMEAN,
AC
DC
TYPE1,
TYPE2
TYPE3
TYPE1
TYPE2
TYPE3
I(n) is the nth measured current value.
N is the number of data updates.
The unit of time is hours.
I(n) • Time
n = 1
N
1
N
1
N
S(n) is the nth measured apparent power value, and N is the number of data updates.
The unit of Time is hours.
S(n) • Time
n = 1
N
1
N
Q(n) is the nth measured reactive power value, and N is the number of data updates.
The unit of Time is hours.
Q(n) • Time
n = 1
N
1
N
i(n) • Time
n = 1
N
1
N
i(n) is the nth 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 the values when i(n) in the above equation is positive.
q- is the sum of the values when i(n) in the above equation is negative.
The unit of time is hours.
P
S
2
+ Q
S
2
S
S
2
- P
S
2
U
S
[V]
I S [A]
(U1 + U2) / 2
(I1 + I2) / 2 (U1 + U2 + U3) / 3
(I1 + I2 + I3) / 3
Integration
S
functions
When the watt-hour integration method for each polarity is Charge/Discharge
[
When the watt-hour integration method for each polarity is Sold/Bought
{
u(n)
•
i(n)
}
]
•
Time
n = 1
N
1
N
[
N is the integration time sampling count. The unit of Time is hours.
WP is the sum of positive and negative watt hours.
WP+ is the sum of the positive power values at each data update interval.
WP- is the sum of the negative power values at each data update interval.
Methods of Computation and Determination
For information about the symbols in the equations,
see the notes at the end of page 3.
N is the integration time sampling count. The unit of Time is hours.
WP is the sum of positive and negative watt hours.
WP+ is the sum of the values when u(n)
•
i(n) in the above equation is positive.
WP– is the sum of the values when u(n)
•
i(n) in the above equation is negative.
Appendix 1 Symbols and Determination of Measurement Functions