Kikusui KHA3000, Руководство по эксплуатации, Страница: 365 / 392

KHA3000
365
Appx
Basic Terms and Definitions
Basic terms related to the general measurement
L1, L2 and L3 represent the values of the L1 phase, L2 phase and L3 phase.
Zsys4[ohm] Permissible system impedance value calculated after converting the measured value
of Plt with a set impedance
Zmax Calculated value of the maximum permissible system impedance.
Calculated minimum values of Zsys1, Zsys2, Zsys3 and Zsys4.
Maximum permissible system impedance of a power supply to which equipment is
connected (power receiving point). Value to be declared as the condition for
connection.
Voltage

Vrms Single-phase three-wire: (L1 Vrms +L2 Vrms) /2
Three-phase three-wire, Three-phase four-wire: (L1 Vrms +L2 Vrms +L3 Vrms) /3
Current

Arms Single-phase three-wire: (L1 A rms +L2 Arms) /2
Three-phase three-wire, Three-phase four-wire: (L1 Arms +L2 Arms +L3 Arms) /3
Apparent power

VA Single-phase three-wire: L1 VA +L2 VA
Three-phase three-wire:
(L1 VA +L2 VA +L3 VA) × ( /3)
Three-phase four-wire: (L1 VA +L2 VA +L3 VA) /3
Real power

W Single-phase three-wire: L1 W +L2 W
Three-phase three-wire: L1 W +L3 W
Three-phase four-wire: L1 W +L2 W +L3 W
Reactive power

var Single-phase three-wire: L1 var +L2 var
Three-phase three-wire: L1 var +L3 var
Three-phase four-wire: L1 var +L2 var +L3 var
3
Scaling When any external current sensor or external PT (potential transformer) is used to
input current or voltage signals, the associated conversion factor or ratio is set for the
signal to determine the current or voltage range of this product and this operation is
called scaling.
Current scaling Applying scaling to the current signal of an external current sensor.
Voltage scaling Applying scaling to match the voltage ratio of an external PT (potential transformer).
CT Ratio The scaling factor of CT (current transformer)
PT Ratio The scaling factor of PT (potential transformer)