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•0"B®K]@ raO^KlG] tDDSK] Luong Thanh Tong cong ty Truyen tai dien Quoc gia Tom tSt: Bdi bdo nghiin ciili di xuat gidi phap ap dung m6t cong nghe mdi Hiiu qud cOa viec dp dung n6 mdt cdng ty diin lUc thUc te Khd nang dp dung cdng nghi mdi ndy Id v6 cCing hieu qud I.DATVAND£ Hien tren t h i gidi cP r l t nhieu hang sin xult t h i l t bi chuan doan v l phan tich phdt hien phdng dien egc bd mIy bien dp nhQ Electrical diagnostic, Ipec, GE, Omieron, Hathaw/ay Hi$n tren the gidi co nhilu phpcfng phdp c h l tao t h i l t bj kiem tra phPng dien cue bo MBA, dya vao d e phydng phdp Cd b i n sau: a SQ dgng d e sen so PD d i i n cd truyen (Electrical PD Sensors) lap CO i^nh vao d e chan sQ MBA b SQ dgng d e sen so PD I m tan (Acoustic PD Sensors) lap dat ben ngoli vd thung MBA hoac kieu dng van lap qua cac van liin thong vdi dau c SQ dung d c sen sO PD tan so sieu cao ap UHF l i p dat qua d e cQa so thInh MBA hole kieu ong lap dat qua d c van lien thong vdi dau Trong s6 d c nhd sdn xuat v l cung cap t h i l t bj t r i n eo hang Powder PD la ed sin pham va p h i n mem Qng dyng co nang tQOng ddi holn chinh, thdn thiin v l trQc quan cho ngQPi sQ dung Ngoli d l sii dung nd MBA khdng can phdi thay ddi lai ket cau hay d i tao lai cac cCfa van cua thiing MBA Trong d c hang tim d c h phat hien sy x u l t hien cac ham lypng chay cd dau Dissolved Gas Analysis (DAG) cda may b i l n I p thi Power PD chl cho ngydi sQ dgng b i l t v l CQdng dp va vi trf cda d i l m phIt sinh phong d i i n cue bd Partial Discharge (PD) MBA Phdng dien cue bp PD I I d e d i l m eua each dien bj b l g l y d i i n , khPng cP d u noi va d i i n cQc.Trong thdi gian xuat hiin PD nang iQpng t i i u t i n tai chd v l thay ddi kieu loai d e tin hieu cung n h Q d c x u n g d d n g d i e n D i e n a p r d i q u a c d c i ^ i n c y c , xuat hiin d c bQc xa dien tQ, d e tin hieu quang, nang iQpng I m GldFl THlEU CdNG NGHE C O A POWER PD Chung ta deu biet sQ co chly nd m I y b i l n dp (MBA) bao gid cung I I mdt sy cd tram trpng nhat ve tinh chat sy co va thiet hai ve kinh t l Trong d e MBA thi sy cd MBA mang dien dp cang cao thi I n h hQdng cua nd cang tram trpng Qua phan tich va thQe te chQng minh hau het cac MBA bj chly d i u nguyin nhin phat sinh cdc phong dien egc bd PD hinh va phdt trien mot thdi gian khong nhd b i n npi bp MBA ma ngQdi qudn !y khdng ed du phQOng tien va t h i l t bi de phdt hien v l k i l m soat no VPi t h i l t bi cua Power PD chung ta co the phan ndo hilu ro dupe ben cle MBA dang van hanh co phIt sinh phdng dien cue bP hay khong VPi he thdng d e sensor AE v l d e bien ddng cao tan HFCT cdc tin hieu thu dQpc dQpc truyen tdi bp xQ ly trung tam PD-TM 1800, qua dQPng t r u y i n RS-422 tdi mIy ti'nh PC iQu giQ lieu vd t h i h i i n d e dang sdng tren mdn hinh sensor va mdn hinh HFCT Viec d i l u chinh d e sensor xung quanh vd cua MBA cd the djnh vj dQdc tQOng doi chinh xac diem ngudn phdt sinh phdng d i i n cue bp b i n MBA Hinh 1: Chdy MBA Hinh 2: Stf d6 khoi h§ thong PD testing Sensor Id loai thiet bi thu tin hieu I m tan cd dP nhay 20pC, MBA phdt sinh d c phdng dien eye bo hay p h I t nhiet, hay cle b i l n dang khuylt tat Cd chung phIt sinh sdng cao t i n cd d l i t i n sd phd hpp vdi sdng I m tan Nha c h l tao da c h l tao d e sensor chl thu tin hiiu dm tan ddi tQ 20500kHz, mdi sensor se dQpc mac djnh bang mot m l u ed djnh tQong Qng vdi m l u cua dQdng bieu thj dang sdng ma nP thu dQdc Dion & P-^s 11 E] KHOA HpC - CONG NGHE Hinh 5: BP xQly trung t i m JlOlpf Po|cAUBfWTW is Hinh 3: Hinh dang sensor c III |L