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Eyeball Indicator
Eyeball Indicator

... operating state of a device and indication of the fault position in addition to the ON and OFF positions. Eyeball indicators are particularly suitable for monitoring bus bars and line disconnectors in complex transformer substations which are represented in the form of a mimic diagram of relatively ...
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... reactive power required by the inductive characteristics of electrical equipment. These inductive characteristics are more pronounced in motors and transformers, and therefore, can be quite significant in industrial facilities. The flow of vars, or reactive power, through a watthour meter will not a ...
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NVT2001, NVT2002 - NXP Semiconductors
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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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