Title :
Condition assessment and fault diagnosis of two load tap changers using dissolved gas analysis
Author :
Molavi, Hoda ; Zahiri, Alireza ; Anvarizadeh, Katayoun
Author_Institution :
Niroo Res. Inst., Tehran, Iran
Abstract :
Considering the objectives of "condition based preventative maintenance strategy", condition assessment was performed over two load tap changers of 125 MVA power transformers in 230/63 substations using dissolved gas analysis (DGA). The selected load tap changers were: (1) an MR M-type load tap changer and (2) an Elin load tap changer. Choosing load tap changers of 230/63 kV power transformers are quite reasonable since the mentioned power transformers are the most frequently being used power transformers in Iran. The oil samplings were performed according to ASTM D 3613 standard, in two stages and in a three-month interval. Furthermore, samples were analyzed for dissolved gases considering ASTM D 3612 standard.
Keywords :
fault diagnosis; on load tap changers; power transformer insulation; preventive maintenance; transformer oil; transformer substations; ASTM D 3612 standard; ASTM D 3613 standard; DGA; Elin load tap changer; MR M-type load tap changer; apparent power 125 MVA; condition assessment; condition based preventative maintenance strategy; dissolved gas analysis; fault diagnosis; oil samplings; power transformers; substations; voltage 230 kV; voltage 63 kV;
Conference_Titel :
Electricity Distribution (CIRED 2013), 22nd International Conference and Exhibition on
Conference_Location :
Stockholm
Electronic_ISBN :
978-1-84919-732-8
DOI :
10.1049/cp.2013.0689
