الإعداد
موقع الرصد : 1-المرحلة 2 سلك, 100الدائرة الخامسة
مشكلة
Equipment has malfunctioned
تحليل
68 “Wave (voltage waveform distortion)” events were recorded during an 18-day measurement period using the following settings. All events are of the same type.
التالي, the waveform of each “wave” event was checked, و 2 types of events were found.
نوع 1: Not switched to a sine wave after the waveform noise
نوع 2: Switched to a sine wave after the waveform noise
We can assume that the events classified as “switched to a sine wave after the waveform noise” were due to the switching to the UPS output (stand-by system).
It appears that Type 1 has a higher noise level and should be switched to the UPS output. لكن, نوع 2 shows a bigger difference in the current waveform when the voltage waveform shows the noise. لذلك, we can assume that a transient overvoltage occurs simultaneously when this event occurs. للأسف, the transient overvoltage is not detected, because its threshold is set at 0.480kV (480في). It is recommended that the threshold be set at 0.07kV (equivalent to 1/2 of the wave peak value) for a 100Vrms circuit
مصدر : دليل للقياس جودة الطاقة, HIOKI E.E. شركة