Page 140 - intelligent encyclopedia ( equipment issue 1 )

intelligent
TRANSFORMERS

• 7UDQVIRUPHU FODVVLÀFDWLRQ

7KH VXLWDEOH WUDQVIRUPHU IRU WKH RSHUDWLQJ FRQGLWLRQV LV FKRVHQ LQ VRPH sites VXFK DV KLJK WRZHUV KXJH PDOOV
KRVSLWDOV DQG WKH VWDWLRQV LQVWDOOHG XQGHU WKH JURXQG V OHYHO DQG LQ PLQHV DQG IDFWRULHV RI FKHPLFDOV 7KH WUDQV-
IRUPHU LV FODVVLÀHG DFFRUGLQJ WR DOO RI WKH IROORZLQJ FRQVLGHUDWLRQV

The windings covering
7KH WUDQVIRUPHU·V ZLQGLQJV PD\ QRW EH FRYHUHG ZLWK D FDVW UHVLQ EXW LV VXUURXQGHG E\ DLU
7KH WUDQVIRUPHU·V ZLQGLQJV PD\ EH VXUURXQGHG ZLWK D FDVW UHVLQ

• The transformer's tank and method of ventilation

• ,I WKH WUDQVIRUPHU LV QRW FRYHUHG DQG LV QRW VXUURXQGHG ZLWK D SURWHFWLYH FRQWDLQHU WKHQ FRROLQJ the trans-
IRUPHU V FRUH DQG LWV GLHOHFWULF ZLQGLQJV LV GRQH XVLQJ H[WHUQDO DLU
• ,I WKH WUDQVIRUPHU LV FRYHUHG DQG VXUURXQGHG ZLWK D SURWHFWLYH FRQWDLQHU LW VKRXOG EH GHVLJQHG VR WKDW WKH
WUDQVIRUPHU V ZLQGLQJV FRUH FRROLQJ GHSHQGV RQ H[WHUQDO DLU DQG LQ WKLV FDVH LW LV QHFHVVDU\ WR UHIUHVK RU
UHQHZ WKH DLU RI WKH SODFH WR ZKLFK WKH KRW DLU LV UHOHDVHG IURP WKH WUDQVIRUPHU V FRUH 7KH FRQWDLQHU V SUR-
WHFWLRQ GHJUHH LV RIWHQ ,3 ,3 DQG ,3 EDVHG RQ WKH DPELHQW DWPRVSKHUH DURXQG WKH WUDQVIRUPHU
• ,I WKH WUDQVIRUPHU LV FRYHUHG WLJKWHQ DQG VXUURXQGHG ZLWK D FRQWDLQHU WKLV FRQWDLQHU VKRXOG EH SURYLGHG
ZLWK LQWHUORFNLQJ PDUJLQV ZKLFK SUHYHQWV H[FKDQJLQJ WKH H[WHUQDO DPELHQW DLU RU WKH DLU RU JDV LQVLGH LW LI
WKH WUDQVIRUPHU LV RI WKH *DV ÀOOHG GU\ W\SH

• Cooling medium

1. 7KH FRROLQJ PHGLXP around the transformer may be the natural air around the container.
2. 7KH FRROLQJ PHGLXP PD\ EH D VWDEOH JDV VXFK DV QLWURJHQ WKDW·V LQ FDVH RI FRPSOHWHO\ FORVHG WUDQVIRUPHU
ZLWK SURYLGLQJ WKH FRQWDLQHU ZLWK PHDQV WR IDFH WKH FKDQJH RI WKH JDV YROXPH LQVLGH WKH FRQWDLQHU

• Cooling method

1. 7KH FRROLQJ PD\ EH HLWKHU
2. 1DWXUDO FRROLQJ RU
3. 1DWXUDO IRUFHG IRU WKH IRUFHG FRROLQJ IDQV DUH XVHG ZKLFK ZRUN ZKHQ WKH WUDQVIRUPHU·V ORDGLQJ UHDFKHV
near the complete load.
)RUFHG E\ PRYLQJ WKH FRROLQJ PHGLXP DORQJ WKH WUDQVIRUPHU·V FRQWLQXRXV ORDGLQJ UDQJH XVLQJ IDQV LQ-
VWDOOHG RQ WKH FRQWDLQHU·V VXUIDFH ZLWK WKH SUHVHQFH RI DLU LQOHW KROHV ZLWK ÀOWHUV

Transforming percentage /LNH ZKDW KDSSHQV LQ FDVH RI RLO WUDQVIRUPHUV

Method of connecting the /LNH WKH RLO WUDQVIRUPHUV
phases windings

The regulated (rate) power /LNH WKH RLO WUDQVIRUPHUV
for the transformer