Increasing use of solar renewable resources or farms on weak remote locations are causing significant power quality and voltage notch issues with connecting utilities. High penetration of these resources are increasing the sensitivity of these interconnection issues at the PCC, point of common coupling. There are many sync. close techniques but these are complicated and require single phase closing devices along with complicated expensive controllers. Why are pre-insertion resistors not commonly used?
Mohamed EL-Shimy
https://www.electrotechnik.net/2017/11/pre-insertion-resistors-in-circuit.html
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Srete Nikolovski
Inrush current of transformers is rich with harmonic especially with second harmonic and can be detected by modern digital relays.
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