Introduction8 KW2M-A/X User's Manual・DemandItem Unit Display data rangePresent demand *1Active W0.000k to 999.9M Present valueMax. demandReactive varApparent VAActive (export) WReactive (export) varCurrent ANote: Please use this demand function as your standard. The demand value calculated with this functionis not guaranteed.The following term definitions apply:THD(total harmonicdistortion)Ratio of harmonic distortion (voltage or current) to the fundamental frequency. Thelower the value, the less distortion.HarmonicsSinusoidal wave other than the fundamental frequency. Its frequency is awhole-number multiple of the fundamental frequency. The frequency that has 2times frequency (half wavelength) is called 2nd-order harmonics.VoltageunbalancingThe difference between all phases minus voltage due to the load unbalancing.It is calculated as shown below.|Max. (Min.) voltage of all phases－average voltage| x 100 (%)Average voltageCurrentunbalancingThe difference between all phases minus current due to the load unbalancing.It is calculated as shown below.|Max. (Min.) current of all phase－average current| x 100 (%)Average currentPowerinterruption Voltage under 5% of rating is kept for min. 5ms.Under voltage Set the ratio for the rated voltage and it is used for threshold.Voltage under the set ratio is kept for min. 5ms and will be judged as under voltage.Under current Set the ratio for the rated current and it is used for threshold.Current under the set ratio is kept for min. 5ms and will be judged as under current.Over current Set the ratio for the rated current and it is used for threshold.Current over the set ratio is kept for min. 5ms and will be judged over current.Demand byIEC61557-12Based on IEC61557-12 Performance measuring and monitoring devices (PMD)Sliding block intervaldemandThe device calculates by measured power via CT for the interval you haveset. The interval can be set from 1 to 60 (min.) in 1-minute increments (theincrement is defined in “power demand interval 2”). The device calculatesthe demand during the latest finished interval and displays the value.Fixed block intervaldemandThe device calculates by measured power via CT for the interval you haveset. The interval can be set from 1 to 60 (min.) The device calculates thedemand during the latest finished interval and displays the value. After oneinterval finishes, the next interval starts.Current demandThe device calculates the current demand based on a thermal demandmeter. It measures an average current (current demand) within the settinginterval and the max. value is considered as the max. current demand.
