Substation Grounding: Role of Crushed Rock
Ever wondered why crushed rock is spread over the surface of an electric substation? This article goes through the reasons…
Zero Sequence Impedance of Core and Shell Type Wye Wye Transformer
Sequence impedance for typical winding connections can be found in most text books. These ignore magnetizing impedance branch and is…
Comparison of Core and Shell Type Transformer
Power Transformers can also be classified according to the type of construction: Core Type and Shell Type. Type of construction…
Advantages of Triplex Transformer
Triplex transformer is a three-phase transformer made of three single-phase transformers that are interconnected using bus to form three-phase bank.…
UNDERSTAND SYNCHRO CHECK RELAY FOR SOURCE PARALLELING
Synchro check or sync check relays are used to verify that voltage, phase angle, frequency and phase rotation across two…
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…
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…