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Transformer High Current BushingsType CFPT & CFCT36kVup to 40kAIEC 60137-2008
Page 2 / 16 40497231_00
High current bushings for transformer
Features
Bushing Type CFPT version Porcelain Insulator
Bushing Type CFCT version Composite Insulator
Trench RIG technology for oil-free, dry type bushings
Experience: More than 10 000 pieces with this insulation in service for more
than 30 years (Generator Bushings with Ir max. 50kA)
Trench RIG technology (Resin Impregnated FiberGlass)
The active part consists of a solid core, made of fiber glass and inserted concentric layers for the electrical field distribution.
The active part is impregnated under vacuum with a special epoxy resin.
Advantages and benefits
Insulation (class F, 155°C) according IEC 60085 Partial discharge <10pC at Um Low dissipation factor (tg ) <0,005 No paper for insulation; limited sensibility to humidity Highest mechanical performance today Higher performance due to cooling system with transformer oil No additional filling between porcelain and active part
Tightness of the bushing is made by means of O-rings No over pressure in the bushing possible Easy Interchangeability with all existing designs Possibility to offer the whole package for GSU transformers Available with porcelain or composite insulator on air side with
same dimensions Bushing can be vertically or horizontally mounted Standard creepage distance: 31mm/kV
Page 2 / 16 40497231_00
High current bushings for transformer
Features
Bushing Type CFPT version Porcelain Insulator
Bushing Type CFCT version Composite Insulator
Trench RIG technology for oil-free, dry type bushings
Experience: More than 10 000 pieces with this insulation in service for more
than 30 years (Generator Bushings with Ir max. 50kA)
Trench RIG technology (Resin Impregnated FiberGlass)
The active part consists of a solid core, made of fiber glass and inserted concentric layers for the electrical field distribution.
The active part is impregnated under vacuum with a special epoxy resin.
Advantages and benefits
Insulation (class F, 155°C) according IEC 60085 Partial discharge <10pC at Um Low dissipation factor (tg ) <0,005 No paper for insulation; limited sensibility to humidity Highest mechanical performance today Higher performance due to cooling system with transformer oil No additional filling between porcelain and active part
Tightness of the bushing is made by means of O-rings No over pressure in the bushing possible Easy Interchangeability with all existing designs Possibility to offer the whole package for GSU transformers Available with porcelain or composite insulator on air side with
same dimensions Bushing can be vertically or horizontally mounted Standard creepage distance: 31mm/kV
Page 3 / 16 40497231_00
High current bushings for transformer
Design
1. Top terminal in aluminum or copper (silver-plated) 2. Conductor in aluminum in standard or copper on request 3. Bottom terminal in aluminum or copper (silver-plated) 4. Active part in resin impregnated fiber glass 5. Insulator porcelain or composite 6. Flange in aluminum 7. Air escape screw 8. Test tap
Standards
Trench RIG high current bushings are specified and tested according to the latest IEC 60137-2008 and IEEE C57.19.00-2004
Current rating
The CFPT and CFCT bushings are designed to connect an oil filled transformer winding to a generator bus in a duct.
The bushing current rating is guaranteed for the following environmental conditions: o Transformer oil temperature = 90°C o Maximum, hot spot, bushing conductor temperature = 135°C o Maximum ambient air temperature in bus duct = 70°C
CFPT and CFCT bushings will operate properly regardless of the surrounding air temperature inside the bus duct
Rated current can be increased when used without a bus duct.
Maintenance free
Maintenance and inspection free The bushings are equipped with a test tap (see page 7 picture 5) on the flange. This enables the
dielectric dissipation factor (tg ) and the capacitance of the bushing to be measured.
1
2
3
4 5
6
7
8
Page 3 / 16 40497231_00
High current bushings for transformer
Design
1. Top terminal in aluminum or copper (silver-plated) 2. Conductor in aluminum in standard or copper on request 3. Bottom terminal in aluminum or copper (silver-plated) 4. Active part in resin impregnated fiber glass 5. Insulator porcelain or composite 6. Flange in aluminum 7. Air escape screw 8. Test tap
Standards
Trench RIG high current bushings are specified and tested according to the latest IEC 60137-2008 and IEEE C57.19.00-2004
Current rating
The CFPT and CFCT bushings are designed to connect an oil filled transformer winding to a generator bus in a duct.
The bushing current rating is guaranteed for the following environmental conditions: o Transformer oil temperature = 90°C o Maximum, hot spot, bushing conductor temperature = 135°C o Maximum ambient air temperature in bus duct = 70°C
CFPT and CFCT bushings will operate properly regardless of the surrounding air temperature inside the bus duct
Rated current can be increased when used without a bus duct.
Maintenance free
Maintenance and inspection free The bushings are equipped with a test tap (see page 7 picture 5) on the flange. This enables the
dielectric dissipation factor (tg ) and the capacitance of the bushing to be measured.
1
2
3
4 5
6
7
8
Page
4 /
16
40
4972
31_0
0 Ty
pe C
FPT
& CF
CT 3
6kV
Com
men
ts re
late
d to
col
umns
: 03
: Bus
hing
s te
st v
olta
ge a
t 50H
z 60
sec
. 07
: Oth
er e
xten
sion
cur
rent
tran
sfor
mer
on
requ
est
08,0
9: B
rown
gla
zed
porc
elai
n, G
ray
colo
r on
requ
est
09: 3
1mm
/kV
in s
tand
ard
12,1
3: L
1 dep
ends
on
L 4. T
he v
alue
s in
the
tabl
e ar
e va
lid fo
r L4=
0m
m. I
f L4>
0mm
add
L4 t
o L 1
and
L.
0102
0304
0506
0708
0910
1112
1314
1516
1718
1920
2122
2324
2526
2728
Highest voltage (Um)
Maximum phase to earth voltageBushing Dry Power frequency voltage withstand (AC)Transformer Power frequency voltage withstand (AC)Lightning Impulse withstand voltage (BIL)
Rated current (Ir)
CT Space L4
AD Arcing distance (min.)
Standard creepage distance 31mm/kV
Mass Approx.
Cantilever test load (min)
LL 1
L 2L 4
D1
D2
D3
D4
D5
øtn
e
Number of upper connection pads
Number of lower connection pads
Top terminal
Bottom terminal
See connection page
kVkV
kVkV
kVA
mm
mm
mm
kgN
3621
7770
170
7800
340
1130
7331
5085
532
053
50
220
290
335
265
390
1512
224
12x
Ø18
4xØ
18pa
ge 6
1200
011
8010
631
5085
532
053
50
300
400
450
345
490
2012
226
22x
Ø18
4xØ
18pa
ge 7
1600
012
3515
031
5085
532
053
50
400
535
590
445
590
2216
2210
22x
Ø18
6xØ
18pa
ge 8
2000
013
1020
831
5085
532
053
50
525
620
680
570
730
2216
2214
22x
Ø18
8xØ
18pa
ge 9
2500
013
6628
631
5085
532
053
50
625
720
780
670
830
2216
2216
22x
Ø18
12xØ
18pa
ge 1
0
3150
014
8843
031
5011
3532
076
00
820
930
980
890
1050
2224
2522
22x
Ø18
16xØ
18pa
ge 1
1
Standard: 0, 300
mm
mm
Page 4 / 16 40497231_00
Type CFPT & CFCT 36kV
Comments related to columns : 03: Bushings test voltage at 50Hz 60 sec. 07: Other extension current transformer on request 08,09: Brown glazed porcelain, Gray color on request 09: 31mm/kV in standard 12,13: L1 depends on L4. The values in the table are valid for L4= 0mm. If L4>0mm add L4 to L1 and L.
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
High
est v
olta
ge (U
m)
Max
imum
pha
se to
ear
th v
olta
geBu
shin
g Dr
y Po
wer f
requ
ency
vol
tage
wi
thst
and
(AC)
Tran
sfor
mer
Pow
er fr
eque
ncy
volta
ge
with
stan
d (A
C)Li
ghtn
ing
Impu
lse
with
stan
d vo
ltage
(B
IL)
Rate
d cu
rrent
(Ir)
CT S
pace
L4
AD A
rcin
g di
stan
ce (m
in.)
Stan
dard
cre
epag
e di
stan
ce 3
1mm
/kV
Mas
s Ap
prox
.
Cant
ileve
r tes
t loa
d (m
in)
L L1 L2 L4 D1 D2 D3 D4 D5 øt n e Num
ber o
f upp
er c
onne
ctio
n pa
ds
Num
ber o
f low
er c
onne
ctio
n pa
ds
Top
term
inal
Botto
m te
rmin
al
See
conn
ectio
n pa
ge
kV kV kV kV kV A mm mm mm kg N
36 21 77 70 170 7800 340 1130 73 3150 855 320 535 0 220 290 335 265 390 15 12 22 4 1 2xØ18 4xØ18 page 6
12000 1180 106 3150 855 320 535 0 300 400 450 345 490 20 12 22 6 2 2xØ18 4xØ18 page 7
16000 1235 150 3150 855 320 535 0 400 535 590 445 590 22 16 22 10 2 2xØ18 6xØ18 page 8
20000 1310 208 3150 855 320 535 0 525 620 680 570 730 22 16 22 14 2 2xØ18 8xØ18 page 9
25000 1366 286 3150 855 320 535 0 625 720 780 670 830 22 16 22 16 2 2xØ18 12xØ18 page 10
31500 1488 430 3150 1135 320 760 0 820 930 980 890 1050 22 24 25 22 2 2xØ18 16xØ18 page 11Stan
dard
: 0, 3
00
mm mm
Page 5 / 16 40497231_00
Dimensional Drawing
D4
D1
L4
L1
L
L2
n x øt
e
D5
D2
D3
3x45
°
Page 5 / 16 40497231_00
Dimensional Drawing
D4
D1
L4
L1
L
L2
n x øt
e
D5
D2
D3
3x45
°
Page 6 / 16 40497231_00
Standard Aluminum Connection 7800A
30
Air side 4 connections pads Thickness 25mm
Oil side
55
90
40
20
120
60
90
40
20
2 x
ø18
4 x
ø18
150 on pads
Page 6 / 16 40497231_00
Standard Aluminum Connection 7800A
30
Air side 4 connections pads Thickness 25mm
Oil side
55
90
40
20
120
60
90
40
20
2 x
ø18
4 x
ø18
150 on pads
Page 7 / 16 40497231_00
Standard Aluminum Connection 12000A
55
90
40
20
120
60
90
40
20
25
90
Air side 6 connections pads Thickness 25mm
4 x
ø18
2 x
ø18
235 on pads
Oil side
Page 7 / 16 40497231_00
Standard Aluminum Connection 12000A
55
90
40
20
120
60
90
40
20
25
90
Air side 6 connections pads Thickness 25mm
4 x
ø18
2 x
ø18
235 on pads
Oil side
Page 8 / 16 40497231_00
Standard Aluminum Connection 16000A
55
90
40
20
150
50
90
40
20
25
120
50
Air side 10 connections pads
Thickness 25mm 2
x ø1
8
335 on pads
6 x
ø18
Oil side
Page 8 / 16 40497231_00
Standard Aluminum Connection 16000A
55
90
40
20
150
50
90
40
20
25
120
50
Air side 10 connections pads
Thickness 25mm
2 x
ø18
335 on pads
6 x
ø18
Oil side
Page 9 / 16 40497231_00
Standard Aluminum Connection 20000A
55
90
40
20
200
50
90
40
20
50
25
120
50
460 on pads
2 x
ø18
Air side 14 connections pads
Thickness 25mm
8 x
ø18
Oil side
Page 9 / 16 40497231_00
Standard Aluminum Connection 20000A
55
90
40
20
200
50
90
40
20
50
25
120
50
460 on pads
2 x
ø18
Air side 14 connections pads
Thickness 25mm
8 x
ø18
Oil side
Page 10 / 16 40497231_00
Standard Aluminum Connection 25000A
Air side 16 connections pads
Thickness 25mm 55
90
40
20
300
50
90
40
20 50 50
25
140
50 50
12 x
ø18
560 on pads
2 x
ø18
Oil side
Page 10 / 16 40497231_00
Standard Aluminum Connection 25000A
Air side 16 connections pads
Thickness 25mm 55
90
40
20
300
50
90
40
20 50 50
25
140
50 50
12 x
ø18
560 on pads
2 x
ø18
Oil side
Page 11 / 16 40497231_00
Standard Aluminum Connection 31500A
250
30
55
90 40
20
480
60
90
40
20
60 60 60 60 60 60
670 on pads 2
x ø1
8
12 x
ø18
22 connections pads Thickness 25mm
Oil side
Air side
Page 11 / 16 40497231_00
Standard Aluminum Connection 31500A
250
30
55
90 40
20
480
60
90
40
20
60 60 60 60 60 60
670 on pads
2 x
ø18
12 x
ø18
22 connections pads Thickness 25mm
Oil side
Air side
Page 12 / 16 40497231_00
On Request
Every connection and interchangeability configuration can be done
Page 12 / 16 40497231_00
On Request
Every connection and interchangeability configuration can be done
Page 13 / 16 40497231_00
G1/4 Air Outlet
Test Tap
Springs Lock System
Page 13 / 16 40497231_00
G1/4 Air Outlet
Test Tap
Springs Lock System
Page 14 / 16 40497231_00
Technical data request Mark the requested value…
Um 24kV 36kV 52kV Other
………………………………………………………………………………………………………………………………………………... Up Transfo 50kV 70kV 95kV Other
………………………………………………………………………………………………………………………………………………... BIL 125kV 170kV 250kV Other
………………………………………………………………………………………………………………………………………………... Rated Current 7800A 12000A 16000A
20000A 25000A 31500A
Other
………………………………………………………………………………………………………………………………………………... CT Space 0mm 300mm Other
………………………………………………………………………………………………………………………………………………... Terminals Material Aluminum Copper Other
………………………………………………………………………………………………………………………………………………... Maximum Oil Temperature 90°
70° 80° 100°
Other
………………………………………………………………………………………………………………………………………………... Bus Duct 60° 70° 80° Other
………………………………………………………………………………………………………………………………………………... Mounting Vertical Horizontal Other
Page 14 / 16 40497231_00
Technical data request Mark the requested value…
Um 24kV 36kV 52kV Other
………………………………………………………………………………………………………………………………………………... Up Transfo 50kV 70kV 95kV Other
………………………………………………………………………………………………………………………………………………... BIL 125kV 170kV 250kV Other
………………………………………………………………………………………………………………………………………………... Rated Current 7800A 12000A 16000A
20000A 25000A 31500A
Other
………………………………………………………………………………………………………………………………………………... CT Space 0mm 300mm Other
………………………………………………………………………………………………………………………………………………... Terminals Material Aluminum Copper Other
………………………………………………………………………………………………………………………………………………... Maximum Oil Temperature 90°
70° 80° 100°
Other
………………………………………………………………………………………………………………………………………………... Bus Duct 60° 70° 80° Other
………………………………………………………………………………………………………………………………………………... Mounting Vertical Horizontal Other
Page 15 / 16 40497231_00
Notes:
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Trench® France SAS16, rue du Général CassagnouB.P. 80070 F-68302 Saint-Louis Cedex France Phone : +33 3 89 70 23 23Fax : +33 3 89 70 23 59
40497231_00
Product Range
Bushings for
• Power Transformers up to 550 kV, 5000A
• High Current Application up to 52 kV, 40kA
• Transformer to SF6 connection up to 550kV
• Gas-insulated Switchgear (GIS) up to 800 kV, 6000A
• Generators up to 36 kV, 50kA
• Railways
• Buildings , Wall up to 245 kV, 5000A
• Bushings according Standard IEC 60137
• Bushings according to customer’s special specification
Quality
At Trench quality is a way of life. Trench quality assurancecomplies with the most stringent standard of ISO 9001.
Certified by AFAQ since 1994
imprimerie de saint-louis troendlé bieler
All rights reserved.Brands and trademarks used in this documentare the property of Trench®Subject to change without prior notice.The information in this document contains general descriptions of the technical options which are not necessarily available in every single case. The required features must therefore be defined in each individual case when concluding the contract.
