Read more
Power transformer As one of the most expensive and vital elements of the power system, it requires accurate, fast and reliable protection in all transformer operating conditions. The differential protection design is used as the main protection in all transformers. One of the problems in the proper functioning of this protection is the issue of intrusion current. The inrush current often flows when the transformer is initially energized or the transformer returns to the mains after the short-circuit fault in the primary head has been rectified. The amplitude of this current is up to ten times the rated current of the transformer and can be mistaken for fault current by differential relays. Issuing a trip command in this situation will prevent the transformer from starting. Since the attack current gradually dampens over ten cycles and decreases to its nominal value, it does not damage the transformer, so it is necessary to use a design in the differential protection system to prevent this current from other transient currents. Detected and prevent relays from operating. Because inrush currents are perharmonic currents, and especially the second harmonic amplitude is significant in
About the author
Elham Salamatnia wurde in Abadan, Iran, geboren. Sie hat einen Masterabschluss in elektrischer Energietechnik und verfügt über mehr als 17 Jahre Arbeits- und Lehrerfahrung. Sie ist Autorin von 6 Büchern auf dem Gebiet der Elektrizität und Technologie, die in 7 Sprachen übersetzt und der Öffentlichkeit zugänglich gemacht wurden.
