Satel SENNET DL150, Manual

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Dataloggers SenNet DL150 / DL151 / DL170 / DL171 / DL172. Technical manual
Version 1.01 Satel Spain 17
Rogowski coils: for currents from 100A to 5000A
3.6.5. Precision
1%
3.6.6. Indicators
SenNet dataloggers are equipped with pulse outputs that indicate the evolution of the active / reactive
and apparent power in real time via LED diodes.
3.6.7. Calculation of the active and the reactive power
The SenNet dataloggers with internal electricity meters (DL151, DL171 and DL172) use an advanced
method for calculating the active and reactive power (and consequently, for calculating the active and
reactive energy). They use a DSP (Digital Signal Processor) that makes the calculations for the entire
range of fundamentals and harmonics.
Calculation of the active power:
∑ 𝑉
𝑘
𝑉
𝑘
cos(𝜑
𝑘
− 𝑌
𝑘
)
∞
𝑘=1
Calculation of the reactive power:
∑ 𝑉
𝑘
𝑉
𝑘
sin(𝜑
𝑘
− 𝑌
𝑘
)
∞
𝑘=1
Where
k goes from 1 (fundamental value) through all the harmonics (2, 3...).
3.6.8. Power Quality
The internal electricity meters included in the models DL151, DL171 and DL172 incorporate the
function
Power Quality . This function, automatically detects voltage drops, interruptions or surges;
identifying and reporting the phase in which they occurred.
High-resolution measurement of the mains frequency (0.0195%). [mains frequency is also called power
line frequency]