What is Anti Pump Relay?
Anti-Pump relay is used in medium voltage power circuit breaker closing circuit to ensure that if breaker receives simultaneous open…
Voltage Swell due to Line-Ground Fault
Voltage Swell is defined by IEEE as increase in RMS voltage from 110% to 180% of nominal voltage at power…
Double Line to Ground Fault Waveform
Characteristics of a Double Line to Ground Fault or Phase to Phase to Ground fault Double line to ground fault…
Transformer Open Circuit Test
Open circuit test is performed on a transformer to measure the no-load losses and to obtain the transformer core electrical…
Transformer Excitation Current
What is transformer excitation current? When normal voltage is applied to the terminals of a transformer with the secondary circuit…
Overcompensation of reactive power for induction motors
When excessive amounts of reactive power compensation (PF Correction) is applied to terminals of induction motor, it can result in…
Single Phase Motor Starting
Basics of single-phase motor starting: A single phase motor connected to a single-phase supply will not rotate as the windings…
Autotransformer Starter: A reduced voltage motor starting method
Autotransformer starting of motors is used widely in starting large industrial motors due to its advantage of providing the highest…
MOTOR DIFFERENTIAL PROTECTION
Differential protection of induction motors provides very sensitive protection against internal phase -phase and internal phase-ground faults. Motor needs to…
Harmonic Resonance in Power Systems
Harmonic currents produced by non-linear electronic loads are injected in to the power system grid. The effect of injecting large…