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voltage to another. It can be magnetizes the iron core. As static solid state device which
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on the magnetic induction coil. The change of voltage trouble-free life, as used to
principle. A transformer (voltage ratio) between the transmit the electrical power
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device, which insures under the two coils.
normal operating condi- it’s consider electromagnetic
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WUDQVIRUPHUµ
,W·V FRQVLVWLQJ RI VLPSOHVW IRUP RI WZR RU PRUH FRLOV RI LQVXODWHG ZLUH ZRXQG RQ D ODPLQDW-
ed steel core.
Primary coil:
LWV LQVXODWHG FXSSHU FRLO FRQQHFWHG WR JHQHUDWLRQ VRXUFH
Secondary coil:
its insulated copper coil connected to electrical loads
Iron core:
0DGH RI VLOLFRQ ZURXJKW LURQ LQ WKH IRUP RI WKLQ VWULSV LVR-
lated from each other to reduce the eddy currents.
We can say:
:KHQ YROWDJH LV LQWURGXFHG WR RQH FRLO FDOOHG WKH SULPDU\
LW PDJQHWL]HV WKH LURQ FRUH $ YROWDJH LV WKHQ LQGXFHG LQ WKH
RWKHU FRLO FDOOHG WKH VHFRQGDU\ RU RXWSXW FRLO 7KH FKDQJH RI
YROWDJH RU YROWDJH UDWLR EHWZHHQ WKH SULPDU\ DQG VHFRQGDU\
GHSHQGV RQ WKH WXUQV UDWLR RI WKH WZR FRLOV
We Can Say
:KHQ YROWDJH LV LQWUR-
GXFHG WR RQH FRLO FDOOHG
WKH SULPDU\ LW PDJQHWL]HV
WKH LURQ FRUH $ YROWDJH LV
then induced in the other
FRLO FDOOHG WKH VHFRQGDU\
RU RXWSXW FRLO 7KH FKDQJH
RI YROWDJH RU YROWDJH UDWLR
EHWZHHQ WKH SULPDU\ DQG
secondary depends on the
WXUQV UDWLR RI WKH WZR FRLOV
132
intelligent
TRANSFORMERS
7KH DOWHUQDWLQJ FXUUHQW SDVVHV DW WKH SULPDU\ FRLO
JHQHUDWH YDULHV PDJQHWLF ÀHOG
7KLV PDJQHWLF ÀHOG FXW WKH VHFRQGDU\ FRLO E\ WKDW
JHQHUDWH HOHFWULFDO YROWDJH LQ WKH VHFRQGDU\ FRLO
6R WKH PDJQHWLF ÀHOG JHQHUDWHG E\ SULPDU\ FRLO
FDXVHV WR JHQHUDWH YROWDJH DW VHFRQGDU\ FRLO E\ HOHF-
WURPDJQHWLF LQGXFWLRQ
Types of transformers
Step up transformer ZKHQ WKH QXPEHU RI WXUQV RI WKH SULPDU\ FRLO ´
1Sµ PRUH WKDQ QXPEHU RI WXUQV RI WKH VHFRQG-
DU\ FRLO µ1Vµ LW·V FDOOHG VWHS XS WUDQVIRUPHU WKDW
means the output of the transformer more than its
input
Step down transformer ZKHQ WKH QXPEHU RI WXUQV RI WKH VHFRQGDU\ FRLO
´1Vµ PRUH WKDQ QXPEHU RI WXUQV RI WKH SULPDU\
FRLO µ1Sµ LW·V FDOOHG VWHS GRZQ WUDQVIRUPHU WKDW
means the output of the transformer less than its
input
7KH HIÀFLHQF\ RI WUDQVIRUPHU
,WV UDWLR RI WKH PD[LPXP FDSDFLW\ FDQ EH SXOOHG IURP WKH VHFRQGDU\ FRLO WR WKH SULPD-
ry coil capacity.
The protection of the transformer
The main component for protection circuit
3URWHFWHG &LUFXLW %UHDNHU
& 7 9 7
3URWHFWLYH 5HOD\
'LUHFW YROWDJH VRXUFH FRQWDLQ IURP EDWWHU\ DQG 'F FKDUJHU
The main component for protection circuit
3URWHFWHG &LUFXLW %UHDNHU
$X[LOLDU\ 5HOD\
$ODUPV DQG 6LJQDOLQJ (TXLSPHQW
FH FRQWDLQ IURP EDWWHU\ DQG 'F FKDUJHU
How to work the stages of protection
Measure the electrical quantities. Measure the electrical quantities after con-
6HQVH )LQG WKH IDXOW QHFW WKH FLUFXLW EUHDNHU ZKLFK LW GLVFRQQHFW-
6HQG GLVFRQQHFW VLJQDO WR WKH FLUFXLW EUHDNHU ed before
DQG VHQG DODUP VLJQDO
Isolate the fault.
133
intelligent
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
intelligent
TRANSFORMERS
Protection
of public bars:
Frame Leakage
Protection that’s at 33 KV
bars only.
Buchholz relay:
Bu
&RQVLVWV RI WZR FROXPQV WKH ÀUVW LQ WKH WRS DQG VHFRQG LQ
WKH ERWWRP LQ FDVH RI D VKRUW FLUFXLW RFFXUUHG LQVLGH WKH
HOHFWULF WUDQVIRUPHU WKH RLO LV ERLOLQJ DQG WKH JDV LQFUHDVHV
WKHVH JDVHV RYHUWXUQ WKH XSSHU FROXPQV LQ WKH %XFKKRO]
5HOD\ DQG WKHVH IRU DODUP
:KHQ WKH XSSHU FROXPQV FKDQJHV WKH FRQWDFW SRLQWV DUH
closed and the alarm occurs.
In case of disconnected the electrical transformer after
DODUP WKH JDVHV LQFUHDVHG DQG RYHUWXUQ WKH ERWWRP FROXPQV
DQG RFFXU WULS ZKLFK LV WKH SURFHVV RI VHSDUDWLRQ IRU WKH
electric transformer.
The temperature ,W KDV OLPLW IRU WKH WHPSHUDWXUH RI RLO LQ WKH WUDQVIRUPHU ZKHQ EH
PDNH DODUP ZKHQ LW PDNH WULS
$QG LW KDV OLPLW IRU WKH WHPSHUDWXUH RI ZLQGLQJ RI WKH WUDQVIRUPHU ZKHQ
EH PDNH DODUP ZKHQ EH PDNH WULS
Pressure: +HUH LQ WKH FDVH RI GHOD\LQJ WKH RSHUDWLRQ RI WKH %XFKKRO]H 5HOD\ DQG WKH 'LIIHUHQ-
WLDO 5HOD\ WKH SUHVVXUH RI WKH RLO LV LQFUHDVHG E\ D FHUWDLQ YDOXH
3UHVVXUH FDOOHG 3UHVVXUH 5HOLHI WKH RLO LV UHOHDVHG IURP LWV SRVLWLRQ
Transformer testing
The transformers should meet the conditions of the HOHFWURFXWLRQ VWDQGDUG VSHFLÀFDWLRQV ZKLFK DUH UH-
(J\SWLDQ VWDQGDUG VSHFLÀFDWLRQV QXPEHU IHUUHG DQG DW WKH H[SHQVH RI WKH PDQXIDFWXUHU FRPSDQ\
DFFRUGLQJ WR WKH UXQQLQJ UXOHV DQG PHWKRGV LQ WKH
$QG VR WKDW WKH IROORZLQJ URXWLQH WHVWV DUH FDUULHG PRVW PRGHUQ YHUVLRQ RU WKH VWDQGDUG VSHFLÀFDWLRQV DQG
RXW LQ WKH IDFWRU\ DQG DFFRUGLQJ WR WKH LQWHUQDWLRQDO ZKLFK DUH FHUWLÀHG E\ WKH HQJLQHHU
No load tests
The load is raised on the sides of the low voltage in the transformer with keeping the sides of the medium
voltage open, the following parameters are measured:
• 0HDVXULQJ WKH FXUUHQW DW QR ORDG
• 0HDVXULQJ WKH ORVV RI SRZHU DW QR ORDG QR ORDG ORVVHV
• 0HDVXULQJ WKH ZLQGLQJ UHVLVWDQFH DQG WKH UDQJH RI WKHLU HTXDOLW\ DW WKH SKDVHV
• 0HDVXULQJ WKH YROWDJH DQG FRQYHUVLRQ UDWH UDWLR ^9 9 1 1 ` DQG WKLV SHUFHQWDJH LV PHDVXUHG DW HDFK
VWHS RI WKH WDS FKDQJHU VWHSV WR PDNH VXUH RI WKH ORZHVW YDOXH DQG WKH KLJKHVW YDOXH DQG WR FRPSDUH LW ZLWK
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DFFHSWHG WDEOHV RI JXDUDQWHH
• ,GHQWLI\LQJ WKH YHFWRU JURXS WR HQVXUH PHHWLQJ WKH UHTXLUHG VWDQGDUG VSHFLÀFDWLRQV
Short circuit test
7KLV LV FDUULHG RXW E\ LQMHFWLQJ WKH VKRUW FLUFXLW FXUUHQW ,VF EDVHG RQ WKH WUDQVIRUPHU V YROWDJH RQ WKH KLJK
YROWDJH FRLOV ZLWK PDNLQJ D VKRUW FLUFXLW RQ WKH ORZ YROWDJH FRLOV ,Q WKLV WHVW WKH IROORZLQJ SDUDPHWHUV DUH
PHDVXUHG
intelligent
TRANSFORMERS
1. /RDG FXUUHQW
2. 0HDVXULQJ WKH LPSHGDQFH YROWDJH ZKLFK LV NQRZQ DV = RU RI VKRUW FLUFXLW
YROWDJH
3. 0HDVXULQJ WKH ORVV RI FRSSHU &RSSHU ORVVHV DW WKH FRPSOHWH ORDG FXUUHQW
7KHVH YDOXHV DUH FRPSDUHG WR WKDW ZKLFK DOORZHG DFFRUGLQJ WR WKH WHFKQLFDO VSHF-
LÀFDWLRQV RI WKH WUDQVIRUPHU DQG WKH WDEOHV RI JXDUDQWHH SUHVHQWHG E\ WKH LPSRUWHU
ZLWK VWDQGDUGL]LQJ WKH PHDVXUHG YDOXHV DW &R IRU WKH RLO WUDQVIRUPHUV DQG
&R IRU WKH GU\ WUDQVIRUPHUV
• Other tests
,QGXFHG RYHU YROWDJH ZLWKVWDQG WHVW DQG SDUWLDO GLVFKDUJH WHVW PHDVXUHPHQW
7KLV WHVW LV FDUULHG RXW DW D YROWDJH RI YROWV DQG D IUHTXHQF\ RI KHUW] D WHVW YROWDJH
RI WZLFH WKH QHW YROWDJH DQG D IUHTXHQF\ RI WKUHH WLPHV WKH QHW IUHTXHQF\ LV SXW RQ WKH VLGHV
RI WKH ORZ YROWDJH RI WKH WUDQVIRUPHU ZLWK NHHSLQJ WKH VLGHV RI WKH PHGLXP YROWDJH RSHQ IRU
D PLQXWH RU WKLV WHVW LV FDUULHG RXW DW D YROWDJH RI YROWV DQG D IUHTXHQF\ RI KHUW] IRU
VHFRQGV DQG WKH UHVXOWV VKRXOG EH ZLWKVWDQGLQJ WKH WHVW ZLWKRXW FROODSVLQJ RI WKH LVRODWLRQ
1. 6HSDUDWH ² VRXUFH SRZHU IUHTXHQF\ ZLWKVWDQG WHVW
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1. 7KH WHVW LV FDUULHG RXW DW D YROWDJH RI . 9 IRU WKH WUDQVIRUPHUV ZLWK PHGLXP YROW-
DJH FRLOV RU . Y DQG DW D YROWDJH RI . Y IRU WKH WUDQVIRUPHUV ZLWK PHGL-
XP YROWDJH FRLOV . Y 7KLV LV IRU MXVW D RQH PLQXWH IRU WKH KLJK YROWDJH FRLOV ZLWK
JURXQGLQJ WKH ORZ YROWDJH FRLOV
2. 7KH ORZ YROWDJH FRLOV DUH WHVWHG DW D YROWDJH RI . Y IRU D RQH PLQXWH ZLWK
JURXQGLQJ WKH KLJK YROWDJH FRLOV
1. 7HVWLQJ WKH WUDQVIRUPHU V RLO
2. 2EVHUYLQJ DQ\ OHDNDJH RI WKH RLO
136
intelligent
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• Type test
1. 7KH WHVW RI WHPSHUDWXUH LQFUHDVH DW WKH UDWHG FXUUHQW XVLQJ WKH PHWKRG RI VKRUW
circuit.
2. ,PSXOVH ZLWKVWDQG WHVW ZLWK D QXPEHU RI WKUHH UXVKLQJ ZDYHV IRU HDFK SKDVH E\
D ZDYH PLFURVHFRQG DQG ZLWK DQ LPSXOVH YROWDJH DFFRUGLQJ WR WKH UDWHG
FXUUHQW RI WKH WUDQVIRUPHU DQG DFFRUGLQJ WR WKH VWDQGDUG VSHFLÀFDWLRQV
3. 6KRUW FLUFXLW WHVW WKH WUDQVIRUPHU LV WHVWHG WLPHV ZLWK D QXPEHU RI WKUHH
FXUUHQW LPSXOVH ZDYHV IRU HDFK SKDVH LQ D ZRUNLQJ SHULRG RI VHFRQG $QG
VR WKDW WKH LPSXOVH ZDYH FXUUHQW HTXDOV WLPHV WKH UDWHG FXUUHQW 7KHVH W\SH
WHVWV DUH RQO\ FDUULHG RXW ZKHQ VHULRXVO\ DIÀUPHG WR EH FDUULHG RXW LQ WKH GRF-
XPHQWV RI WKH VSHFLÀFDWLRQV DQG WKH FRVW LV WKH UHVSRQVLELOLW\ RI WKH SURMHFW·V
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ÀHG DQDO\VLV ODERUDWRULHV RQ WKH WUDQVIRUPHU ZKLFK KDV WKH VDPH FDSDFLW\ DQG
VSHFLÀFDWLRQV
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YROWV 7KH WHVW LV FDUULHG RXW DW WKUHH SRVLWLRQV
1. 2Q WKH KLJK YROWDJH FRLOV ZKLOH WKH ORZ YROWDJH FRLOV DQG WKH EUHDN RXW SRLQW DUH
JURXQGHG
2. 2Q WKH ORZ YROWDJH FRLOV ZKLOH WKH KLJK YROWDJH FRLOV DV ZHOO DV WKH EUHDN RXW SRLQW
DUH JURXQGHG
3. %HWZHHQ WKH ORZ YROWDJH FRLOV DQG KLJK YROWDJH FRLOV
7KH UHVLVWDQFH LV PHDVXUHG LQ RKP GLUHFWO\ DIWHU VSHQGLQJ VHFRQGV DQG DIWHU
seconds. The resistance value in ohms after 60 seconds should achieve the resistance
YDOXH DIWHU VHFRQGV LQ RKPV 7KH YDOXH LV
• Replacing the refused equipment or tools:
In case of the presence of any problems in the materials or equipment of the trans-
IRUPHU GXULQJ WKH FDOLEUDWLRQ RU WKH WHVW WKH PDQXIDFWXUHU FRPSDQ\ LV KDV WKH UHVSRQ-
sibility to replace them by other appropriate and accepted materials and equipment
DQG WKH UHVSRQVLELOLW\ LV RQ WKH PDQXIDFWXUHU RU WKH FRQWUDFWRU DQG VR WKDW WKH URXWLQH
tests are carried out another time if these materials are related to the types of these
tests.
• General
1. 7KH WUDQVIRUPHUV DUH HYDOXDWHG SURGXFHG DQG WHVWHG DFFRUGLQJ WR WKH ODVW
YHUVLRQ RI WKH LQWHUQDWLRQDO HOHFWURFXWLRQ VSHFLÀFDWLRQV ,(& SDUW WR
SDUW
2. 7KH WKUHH SKDVH SRZHU WUDQVIRUPHUV DUH LPPHUVHG LQ RLO E\ QDWXUDO FRROLQJ
DQG D QDWXUDO FRROLQJ DLU 2LO LPPHUVHG 1DWXUDO $LU 1DWXUDO &RROHG 2161
3. 7KH WUDQVIRUPHUV DUH GHFLGHG ZKHWKHU WKH\ ZLOO EH LQVWDOOHG LQGRRU RU RXWGRRU
DQG DOVR WKH DOWLWXGH DERYH VHD OHYHO WKH DPELHQW WHPSHUDWXUH WKH UHODWLYH
KXPLGLW\ DQG WKH DLU SROOXWHUV RI GXVW VDQG RU DQ\ RWKHU SROOXWHUV DUH GHWHU-
mined.
137
intelligent
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• 7HFKQLFDO HOHFWULFDO VSHFLÀFDWLRQV
1. 7KH IROORZLQJ GDWD VKRXOG E\ GHWHUPLQH N Y D
2. 0D[LPXP FRQWLQXRXV RXWSXW SRZHU ZKLFK GHWHUPLQHV
DQG N Y D
3. 3ULPDU\ YROWDJH DFFRUGLQJ WR WKH DYDLODEOH PHGLXP YROWDJH QHWV
0DQXDO YROWDJH FKDQJHU LQ WKH VLGH RI SULPDU\ YROWDJH ZLWKRXW D ORDG 2II ORDG WDS FKDQJHU
6. &KRRVHV [ ]HUR [ ÀYH VWHSV RU [ ]HUR [ VHYHQ
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8. &RQQHFWLRQ JURXS WUDQVIRUPHU·V FRLOV FRQQHFWLQJ V\VWHPV YHFWRU JURXS '\QO O
)UHTXHQF\ KHUW]
10. ,PSHGDQFH YROWDJH SHUFHQWDJH LPSHGDQFH RU WKH SHUFHQWDJH RI VKRUW FLUFXLW YROWDJH VKRXOGQ·W
EH OHVV WKDQ DQG WKH PD[LPXP H[WUD WROHUDQFH LV GHWHUPLQHG WR EH
11. 7HPSHUDWXUH ULVH LQ WKH DPELHQW WHPSHUDWXUH DFFRUGLQJ WR ZKDW LV PHQWLRQHG LQ WKH LQWHUQDWLRQDO
HOHFWURFXWLRQ VSHFLÀFDWLRQV QXPEHU ,(&
• 7RS RI RLO &R PHDVXUHG E\ WKH WKHUPRPHWHU
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• Isolation level
Isolation level For a primary voltage of 24 k. v. For a primary voltage of 12 k. v.
High voltage impulse withstand
voltage (BIL) (regulated impulse 125 k. v. 75 k. v.
voltage)
Power frequency withstand volt-
age (isolation level) (direction of 50 k. v. 28 k. v.
medium voltage)
Low voltage power frequency
withstand voltage (secondary 3 k. v. 3 k. v.
voltage)
• /RVV PRVW GLVWULEXWLRQ FRPSDQLHV GHPDQG WKDW WKH WUDQVIRUPHUV DUH RI WKH ORZ ORVV W\SH QRW QRU-
mal loss type.
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• 2YHU ORDG WR WKH WUDQVIRUPHU WKH WUDQVIRUPHU VKRXOG EH DEOH WR IHHG WKH ORDGV ZKLFK UHDFKHV WKH
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FRLOV ZLQGLQJV FRQVLGHULQJ ZKDW LV PHQWLRQHG LQ WKH WDEOH QXPEHU
•
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138
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LQJ WKH LURQ KHDUW VLQJOH FKLSV DQG DOO WKH QDLOV DQG FODPSLQJ SODWHV VKRXOG EH FRQQHFWHG WR WKH
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be sculpted on the its cover in clear letters if they are necessary and demanded.
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isolators.
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• Cooling medium
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near the complete load.
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phases windings
The regulated (rate) power /LNH WKH RLO WUDQVIRUPHUV
for the transformer
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Windings (coils)
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Penetration isolators
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Percentage of the transformer's impedance
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er's components.
Table (5/ 5- 6): the maximum allowed values for the temperature increase
for the transformer's parts above the ambient temperature 40 Co
Degree of the windings Temperature of the di- The maximum allowed
parts of the transformer
isolation electric system (Co) temp. increase (Co)
Class A 105 Co 60 Co
Class E 120 Co 75 Co
Class B 130 Co 80 Co
windings
Class F 155 Co 100 Co
Class G 180 Co 125 Co
Class C 220 Co 150 Co
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and the nearby parts
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part of the transformer
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•Note: windings' temperature increase is measured by the resistance (dielectric) method.
- The transformer should be provided with two groups of temp. indicators, one of them also
sends an audible or visible alarm of the temperature increase when the temp. is near the maxi-
mum allowed limit.
- The second indicator group disconnects the transformer from the feeding source when the
temperature increase continues
• The transformer’s attach- • The transformer’s data board
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A comparison between oil Disadvantages of the dry
and dry transformers: transformers:
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than oil transformer because the dust's accumulation of the EURNHQ ZLQGLQJV HVSHFLDOO\ LI WKH WUDQV-
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transformers. the isolator.
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IRUPHU DERXW pared to the oil transformer.
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TAREK EL SEHELLY ELECTRIC COMPANY ALPHA GROUP
Address: MEHALLA EL-KOBRA ELABASY ST., Address: 11 Emad El Din StCairo, Egypt
Tell: +20 106 664 6034 Tell: +20 122 282 1583
[email protected] e-mail: [email protected]
Electronic Meter
Integrated Protection Monitoring Equipment
Electronic Meter
Medium voltage
Low voltage
intelligent
CAST RESIN TRANSFORMER
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essary to satisfy customer needs.
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and turn to turn insulation.
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encountered in heavy traction applications.
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ture.
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ture absorption is required. Due to the smooth coil
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tine maintenance is an occasional visual inspection.
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intelligent
Ratings
Rated voltage
+9 &2,/ XS WR N9
/9 &2,/ XS WR 9
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Standard Tapping range: ±2.5%, ±5%
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Power capacity
6LQJOH SKDVH a N9$
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Frequency: 50Hz, 60Hz
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% Impedance voltage
$16, 67'
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Connections
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Temperature class (According to IEC 726)
+9 &2,/ DQG /9 &2,/ ) &/$66 +
class coils are available by request.
Conductor
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Noise Level (according to NEMA Std.)
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intelligent
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STANDARD SPECIFICATION
intelligent
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residential industries.
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done before.
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