Selection of Variable Frequency Drives – Examples
The equations for calculating the power requirement for VFD has been discussed in Selection of Variable Frequency Drives. Using the equation below, we will provide some examples on selecting a …
Variable Frequency Drive Cable Length Resonance Frequency
This is a continuation of the article Effect of Cable length on Variable Frequency Drive. Cable Resonance When dealing with Variable Frequency Drives (VFDs), the cable length between the VFD …
Effect of Cable Length on Variable Frequency Drive
Every cable has, apart from its resistance, certain inductance and capacitance. The inductance and capacitance is roughly equally distributed along the cable length. Inductance L and capacitance C in a …
PEC, NEC and IEC Comparison of Cable sizes
Administrative Order of 1987 The Philippine Electrical Code (PEC) is based on the National Electrical Code (NFPA 70) with a major update on changing the Imperial Units to Metric Units …
Key Differences in Power Transformer Selection According to International Standards
Power transformer sizing standards according to IEEE (Institute of Electrical and Electronics Engineers) and IEC (International Electrotechnical Commission) differ in certain key aspects. Here’s a breakdown of the major differences …
IEC Current Transformer Accuracy Class
Current transformer (CT) accuracy class refers to how precisely a current transformer can replicate the primary current in its secondary winding, within certain tolerances, under defined conditions. CT accuracy is …