RELAY CONTACT ARCING WAVEFORM
When current flow through inductive circuit is interrupted, voltage proportional to V= L (di/dt) is produced. This voltage can be…
Current Transformer Failure Due to Capacitor Bank Discharge Current
Current Transformer (CT) failure can be due to many reasons some of which are contamination, open circuit secondary, incorrect application…
Rogowski Coil Flexible Current Transformer
Flexible current transformer is also known as Rogowski coil. What is a Rogowski Coil? Rogowski coil is an electric current…
Isolated Ground Receptacle
When interference from electromagnetic sources needs to be managed on the ground circuit of a particular load or sensitive electronic…
Open Neutral: Voltage Fluctuation and Stray Voltage
Open neutral or broken neutral on a service transformer or service cable into a facility can result in serious overvoltage…
Current Transformer DC Saturation and Time to Saturate
Saturation of current transformers (CT) when carrying high magnitude current is a well-known phenomenon. Usually symmetrical fault current is used…
PARAMETERS THAT DETERMINE TRANSFORMER INRUSH CURRENT
High magnitude current lasting few power cycles during switching on a power transformer is known as transformer inrush current. Magnitude…
How Does Power Transformer Saturate?
Power transformer can saturate when voltage to frequency ratio for the particular transformer design is violated. Transformer is said to…
High Impedance Bus Differential Protection
High impedance bus differential is a method of differential bus protection using parallel set of current transformers (CT) from each…
Auto Recloser and Power Quality
What is a recloser? Recloser is an automatic self-controlled and self-contained device used by electric utility companies to disconnect power…