Calculating Phase Difference Between Two Waves
Often we will have two sinusoidal or other periodic waveforms having the same frequency, but is phase shifted. To calculate…
Troubleshooting VFD Problems – How to Measure DC Bus Voltage and DC Ripple
Introduction: Some of the frequent and troublesome VFD faults are related to the DC bus voltage. The VFD control circuit…
Troubleshooting VFD Problems – Overvoltage Fault
Drive (VFD) overvoltage protection for common low HP drives is based on the measured voltage on the DC bus of…
Line Reactor vs DC Choke
Line Reactor Line reactor as used in VFD/VSD application is an inductive component used in the line side or supply…
DC Choke for VFD
A DC choke (DC Link Choke) is used between the rectifier section and the bus capacitor section of a variable…
Medium Voltage Cable Construction
A power cable could appear as a simple electrical device, a conductor wrapped in an insulation. However, as you can…
Why Use an Isolation Transformer?
Isolation transformers are used in drive (VFD / VSD) as well as many other applications to provide any of the…
LINE REACTOR FOR VFD
What is a Line Reactor? Line reactor as used in VFD/VSD application is an inductive component used at the line…
Ferroresonant Transformer
What is a Ferroresonant transformer? Ferroresonant transformer also known as Constant Voltage Transformer (CVT) is used to provide: Voltage sag…
Voltage Sag due to Induction motor starting
Motor Starting Current: Induction motor starting on full voltage (also known as across the line starting or direct on-line starting)…