HOW TO WIRE POWER FACTOR CONTROLLER?
Power Factor controllers or Power Factor relays are used to switch capacitor bank stages depending on the measured system power…
SYNCHRONOUS CONDENSER FOR REACTIVE POWER SUPPORT
A synchronous condenser is a synchronous machine that runs without a mechanical load and is used to provide reactive power…
HOW TO CONNECT DC POWER SUPPLIES IN SERIES, PARALLEL AND REDUNDANT CONFIGURATION?
DC power supplies may be connected in series, parallel or redundant configuration depending on the application need. When higher voltage…
Difference Between ELV, SELV, PELV and FELV
ELV stands for Extra Low Voltage and is indicative of systems operating under 50VAC or 120VDC (ripple free). ELV systems…
VACUUM BREAKER vs VACUUM CONTACTOR
Vacuum Circuit Breakers (VCB) and Vacuum contactors (VC) uses the insulation properties of vacuum to perform current interruption. Both VCB…
POWER FLOW AND VOLTAGE STABILITY ON AC TRANSMISSION LINES
Transmission line power flow is an integral part of power systems studies and is used to calculate steady state voltage,…
CORNER GROUNDED DELTA TRANSFORMER CONNECTION
Ungrounded delta secondary connected transformers were used extensively in the early era of industrial electrical distribution. Ability to operate machinery…
IMPORTANCE OF TRANSFORMER CORE GROUNDING
Laminated steel core of a power transformer is insulated from ground and is typically referenced to ground (earth) at a…
What is a slash-voltage-rated breaker?
Some circuit breakers have dual voltage ratings stamped on them, such as 240/120V or 480/277V. These breakers are known in…
Nuisance Breaker Trip Due to Voltage Phase Angle Variation: Case Study
Negative sequence overvoltage protection [ANSI 59Q] is used for detecting phase voltage unbalance or reverse phase condition. Variation of individual…