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ziv_wprc2013 analysis of oltc of parallel transformers
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... This mechanism has some drawbacks. If the master’s and followers’ tap positions are not the same, or at least harmonized, from the beginning, this undesired situation will remain as long as all these AVR keep working together in the parallel control. And in the case that one AVR disconnects temporar ...
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Opto-isolator



In electronics, an opto-isolator, also called an optocoupler, photocoupler, or optical isolator, is a component that transfers electrical signals between two isolated circuits by using light. Opto-isolators prevent high voltages from affecting the system receiving the signal. Commercially available opto-isolators withstand input-to-output voltages up to 10 kV and voltage transients with speeds up to 10 kV/μs.A common type of opto-isolator consists of an LED and a phototransistor in the same opaque package. Other types of source-sensor combinations include LED-photodiode, LED-LASCR, and lamp-photoresistor pairs. Usually opto-isolators transfer digital (on-off) signals, but some techniques allow them to be used with analog signals.
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