Online monitoring plays an important role in intelligent electrical appliances. This paper describes the online measurement of arc voltage and current when the circuit breaker interrupts the fault current, and the optical online detection technology of temperature parameters of electrical equipment such as high-voltage switchgear and transformers. Keywords: arc voltage; current; high voltage switchgear; transformer; optically thin silicon temperature sensor; absorption type optical fiber temperature sensor; distributed optical fiber temperature sensing system Abstract: On-line monitoring is of very important statu s in the intelligent electrical apparatus. The paper describes arc voltage of the circuit breakers at breaking fault, circuit on-line monitoring and and on-line detect ing technology of options of the temperature parameters of high voltage switch cubicles and t ran sfo rm ers and so on.Key words: arc voltage; current; HV switch cub icle; t ran sfo rm er; option icalm icro- th in silicon temperatn re; t ran sm it ter; absorben t-type fi br - op t ical temperatat n re; dist ributed fi br - op t ical temperat u re; sensing system
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