Power, Energy, and Frequency
Instantaneous Power and Power Factor
The MicroLogic P trip unit offers a number of different measurements.
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Total power measurements:
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Instantaneous active power P in kW
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Instantaneous reactive power Q in kvar
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Instantaneous apparent power S in kVA
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Measurement of the power factor PF
To ensure reliable power and power-factor measurements, the Power sign and Sign convention parameters must be set.
Demand Power
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Display of the demand values for the active power P, reactive power Q and apparent power S
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Selection of the demand calculation method
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Display of the interval over which the value is calculated
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The maximum demand values are displayed and stored in memory.
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The stored maximums can be reset at any time.
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The calculation method, the type of calculation window (fixed or sliding) and its duration may be set in the Metering setup menu under History, maintenance and setup.
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The synchronisation function (Synchro.Com) is available only with the COM communication option. With this function, the demand power is determined on the basis of a signal synchronized by the communication module.
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These settings apply to all demand powers (active power P, reactive power Q and apparent power S). If the settings are modified, the demand values are systematically recalculated.
Energy
The MicroLogic P trip unit offers a number of different measurements.
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Total energy:
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Total active energy E.P in kWh
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Total reactive energy E.Q in kvarh
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Total apparent energy E.S in kVAh
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Energy consumed (Energy in), positively incremented:
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Active energy E.P in kWh
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Reactive energy E.Q in kvarh
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Energy supplied (Energy out), negatively incremented:
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Active energy E.P in kWh
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Reactive energy E.Q in kvarh
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Energy values can be reset.
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The Energy in and Energy out values are incremented according to the power sign set in the Metering setup menu under History, maintenance and setup.
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As standard, the total calculated energy values are absolute total values. They represent the sum of the energy in and out values:
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E.P = Σ E.P in + Σ E.P out
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E.Q = Σ E.Q in + Σ E.Q out
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As an option (access exclusively via the COM communications option), energy can be calculated algebraically:
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E.P = Σ E.P in - Σ E.P out
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E.Q = Σ E.Q in - Σ E.Q out
These values are called signed energies.
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Frequency
The frequency of the distribution system is displayed in Hz.