Page 132 - intelligent encyclopedia ( equipment issue 1 )

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TRANSFORMERS

The characteristic of stage of protection

)RU DQ LQWHUFRQQHFWHG SURWHFWLRQ V\VWHP WKH IROORZLQJ WHFKQLFDO SURSHUWLHV PXVW EH DYDLODEOH

The speed
0XVW WKH SURWHFWLRQ GHYLFH KDYH IDVW UHVSRQVH WR GLVFRQQHFW IDXOW SDUW ZKHQ RFFXUUHG

Simplicity of installation:

7KH VLPSOH LQVWDOODWLRQ RI WKH SURWHFWLRQ UHOD\ LV D NH\ IDFWRU LQ WKH HIÀFLHQF\ UHOLDELOLW\
and maintenance of the relay.

Reliability:

Its mean that device be ready in any
time.
Sensitivity:

6HQVLWLYLW\ RI WKH GHYLFH PHDQV WKH DFFXUDF\
RI WKH GHYLFH LQ WKH ZRUN LQ WHUPV RI PHD-
VXUHPHQW RI HOHFWULFDO TXDQWLWLHV DQG ZRUNLQJ
WLPH VR DQ\ GHYLFH KDYH VHQVLWLYLW\ IDFWRU
LV LR YV YR
,V YV OHVV YDOXH RI YROWH RU OHVV YDOXH RI
short circuit current.
,R 92 OHVV YDOXH RI UHFHQW FXUUHQW RU YROWH

Selectivity:

,WV PHDQ WKH DELOLW\ WR VHOHFW WKH IDXOW SRLQW DQG VHOHFW ZKLFK FLUFXLW EUHDNHU PXVW GLVFRQQHFW
ZKHQ IDXOW RFFXUUHG DQG WKH UHOD\ RI WKLV ]RQH GRQ·W GLVFRQQHFWHG DIWHU VHF DQG LW·V WKH
WLPH RI GLVFRQQHFWHG RI WKH FLUFXLW EUHDNHU ZH ÀQG WKH VHFRQG UHOD\ GR WKH GLVFRQQHFWHG
LQVWHDG RI WKH ÀUVW FLUFXLW EUHDNHU DQG LW KDYH WLPH WR ZRUN LQVWHDG RI WKH ÀUVW UHOD\ VR LW VHW
DIWHU VHF WR GLVFRQQHFW WKH VHFRQG UHOD\ LWV PHDQ WKHUH LV VHF WLPH DYDLODEOH IRU WKH
ÀUVW UHOD\ WR PDNH WKH GLVFRQQHFW
Ex:
5 VHF The electrical protection:

5 VHF
5 VHF Protection of power • 'LIIHUHQWLDO 3URWHFWLRQ
• 2YHUFXUUHQW 3URWHFWLRQ
transformer: • (DUWK )DXOW 3URWHFWLRQ
• 5HVWULFWHG ( ) 3URWHFWLRQ

• &XUUHQW %DODQFH 3URWHFWLRQ
• 2YHU FXUUHQW 3URWHFWLRQ
Capacitor bank: • (DUWK )DXOW 3URWHFWLRQ
• 0D[ 9ROWDJH 3URWHFWLRQ
• /RZ 9ROWDJH 3URWHFWLRQ

• 'LIIHUHQWLDO 3URWHFWLRQ
Reactor protection: • 2YHU &XUUHQW 3URWHFWLRQ
• (DUWK )DXOW 3URWHFWLRQ