Functional Description

Introduction

≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡

Measuring Values

• Voltage

Three-phase measurement of the rms values of the phase-to-neutral and

phase-to-phase voltages of two systems (system [A] and [B]; system [B]

only phase-to-phase). This unit can be delivered with the following measuring

voltage ranges (rated values). Selection of type during ordering: 

– 66/115 Vac – 230/400 Vac

• Frequency

Time measurement from the digitally filtered measuring voltages. The

measurement of the frequency is three phased if all voltages are greater

than 15 % of the rated value (100 Vac or 400 Vac). This guarantees a fast

and precise measurement of the frequency. However the frequency is still

measured correctly even if voltage is only applied to one phase.

• Current

Three-phase rms values.

• Real power

Single-phase measuring calculated from apparent power and power factor

cosphi (power factor).

• Re-active power

Single-phase measurement calculated from apparent power and power factor

sinphi.

• Power factor cosphi

Time measurement between the filtered measuring values of the voltage VL12

and the conductor current IL1.