DELTA CONNECTION OF CURRENT TRANSFORMER
Current transformers [CT] for metering or relaying can be connected in wye or delta fashion. In today’s power system, wye…
Objectionable effects of third harmonic voltage and current
Depending on source grounding, specific transformer winding, and generator connection, third harmonic (zero sequence) current may be suppressed or allowed…
TRANSFORMER CONNECTIONS AND THIRD HARMONIC COMPONENTS
When a power transformer is connected to an AC voltage source, a small primary current known as excitation current will…
REAL POWER LOSS DUE TO POOR POWER FACTOR
Poor power factor can cause large reactive current flow and increased kVA demand, which in turn could lead to utility…
DISPLACEMENT POWER FACTOR vs TRUE POWER FACTOR
Displacement power factor [DPF] is the cosine of the angle difference between fundamental frequency voltage and current waveform. Harmonics are…
WHY IS CORRECTING POWER FACTOR TO UNITY EXPENSIVE?
Power Factor correction is accomplished by adding the required amount of capacitive VARS to the network to compensate for inductive…
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…