A Novel Control Strategy to Reduce Transformer Inrush Currents by Series Compensator

Abstract

-Inrush currents generated by unloaded power characteristics of circuit breaker also have a strong influence transformer often reduce power quality on the system. To to determine the correct instant of mechanical closing time. produced by the power transformer. As a result, the inrush current is well suppressed with such a new control approach.

Investigation and Mitigation of Transformer Inrush Current during Black Start of an Independent Power Producer Plant

“…Many researchers have worked on calculation and mitigation of transformer inrush currents [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Authors in [7], proposed an analytical formula to estimate the maximum inrush current.…”

“…While the first two factors are internal and depend on the transformer design and the core material, the other factors are related to the supplying grid characteristics. The solutions based on changing the design of the transformer such as changing the core material or adding an auxiliary winding on the core [9], may be costly and not suitable for all the operation conditions [10]. Using series compensators as inrush current reduction methods, described in [10,11], is complex and expensive to implement.…”

“…The solutions based on changing the design of the transformer such as changing the core material or adding an auxiliary winding on the core [9], may be costly and not suitable for all the operation conditions [10]. Using series compensators as inrush current reduction methods, described in [10,11], is complex and expensive to implement. A number of other techniques have been proposed to reduce the core flux prior to circuit energization [12][13][14][15].…”