采用tan_表征变频电机绞线对绝缘老化特性的研究.pdfVIP

36 7 2010 7 3 1 H igh V olt ag e Engineering , V ol. 36, N o . 7, Ju ly 3 1, 20 10 1625 tan 吴广宁, 周力任, 郭小霞, 何景彦 ( 西南交通大学电气工程学院, 成都610031) : , JD 117 , , , , , ( SE M ) : , tan, , , , , : : T M 34 T M 855 : A : 1003- 6520 ( 2010) 07- 1625- 05 Aging Characteristics of Inverter- fed Motor Twisted Pair Usi ng tan W U Gu ang- ning , ZH OU L-i ren , GU O Xiao- xia, H E J ing- yan ( School of Elect rical Eng ineer ing, Sout hw est Jiaot ong U niv ersity , Cheng du 610031, China) Abstract: T he f ailure of enam eled w ire u sed in inter- turn in sulatio n of inv erter- f ed moto r w inding is the m ain reason leading to the moto r in sulatio n breakdo w n . T he enam eled w ir e u sed in inter- turn insulation o f J D 117 inver ter- f ed motor w as ex per im entally r esear ched by f ocu sing on tw isted p airs as test o bject . Bipo lar pul se vo ltag e ag ing test w as co ndu cted under variou s frequency and tim e, and dielectric frequ ency and temper ature sp ectra of sp ecim en w er e m easured and analy zed . M o reov er, co mbining w ith scanning electr ical m icroscop e ( SE M ) , the influence of diff erent aging co ndit ion s on sur f ace mor pholog y w as researched. T he exp erim ent result s reveal t hat w ith the deep ening o f aging deg ree, thr ough analyzing frequ ency sp ect rum o f tan, it s peak v alu e can be u sed to ju dg e the insulat ion co ndi- tion . A g ing w ill ch ang e the str ucture of m at erial inter nal , f or long- ch ain s ar e fractured leading to the f orm at ion o f po lar molecules w ith low molecular w eight , ther ef or e, relaxat ion po lar ization is mo re easy to be established. T