epoxy resin impregnated paper bushings - trench group group/trench_bushings/bushings/e3… ·...
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Epoxy Resin ImpregnatedPaper Bushings
17.5 kV to 800 kVup to 31,500 A
BS EN ISO 9001
TRENCH (UK) LTD - The site at Hebburn in the north east of England has pioneered the design and
manufacture of bushings for transformers and switchgear since 1929 and is a worldwide supplier to
equipment manufacturers and utility companies. In the early 1970's we developed Epoxy Resin Impregnated
Paper bushings for use in a wide range of applications and have become the international specialist for this
type of product, which accounts for over 40% of production. Epoxy resin is superior to resin-bonded paper
by offering lower partial discharge activity, a lower power factor and better thermal stability. Our products
are designed and manufactured to BS EN ISO 9001 as well as IEC and ANSI where appropriate.
Facilities Include● Products designed and manufactured to customer requirements.
● All bushings impulse tested as standard.
● Unique high voltage testing.
● Research and development and dielectric type testing to all national and international standards
up to 4MV impulse, 2MV AC, lMV DC in wet and dry conditions.
● Insulation studies and large-scale simulations.
Transformer Bushings● Full range of designs for outdoor or indoor use.
● Oil and SF6 connections.
● Insulation types include ERIP, OIP and RBP.
● OIP condenser bushings (type OTA) for medium/high power transformers
Switchgear Bushings● Solid insulation system for SF6 insulated switchgear giving unrivaled mechanical and electrical
performance up to 550kV.
Insulation Components● Total design and manufacture to customer requirements using epoxy resin, glass fibre and
composites for all types of electrical insulators.
After Sales Service● Comprehensive refurbishment facilities.
● Loan of steel transit frames for 300kV and 420kV bushings.
● Check testing
● Full reporting service
● Re-gasketing.
● Major refurbishment.
● Re-certification included.
● Covers bushings manufactured by other companies including English Electric, Ferranti, Micanite,
Reyrolle and VA Tech.
1
The epoxy resin impregnated paper range provides the very highest standard inbushing technology. Every product is impulse tested as a routine so you can beassured of high reliability and a low cost. With over 30 years experience in the fieldof oil free bushing applications our engineers can support all your through lifeneeds.
TRENCH (UK) LTDis a quality registeredcompany.Its managementsystems have beenassessed and complywith BS EN ISO 9001.
2
CONTENTS
Type HETA Voltage Range 17.5kV to 36kV
High current bushings for transformer to phase
busbar isolated connections
Type ETG Voltage Range 72.5kV to 800kV
Bushings for transformer to gas insulated
switchgear connections
Type EGA Voltage Range 145kV to 525kV
Condenser bushings for direct connection between
metalclad SF6 switchgear and outdoor equipment
3-6
7-8
9-10
Epoxy Resin Impregnated Paper Bushings
17.5kV to 800kV up to 31,500A
Features
● Central aluminium conductor cast in one piece without joints.
● Main insulation : vacuum impregnated epoxy condenser.
● Solid filling available : permits mounting at any angle.
● Thermal stability : excellent.
● Partial discharge : less than 10pC at 1.5Un.
● Freedom from oil leakage from the transformer in the event of porcelain breakage.
● Current transformer accommodation can be provided on request.
● Test tapping : standard.
● Designs available to cover IEC, ANSI and other International Specifications.
● Voltages from 17.5kV to 36kV and current from 6300A to 31500A
The bushing flange dimensions and design ofbushing terminals can be adapted to specificrequirements of the transformermanufacturer or to provide interchangeabilitywith existing bushings.
Type HETA Voltage Range 17.5kV to 36kV
High current bushings for transformer to phasebusbar isolated connections
3
FLA
NG
E PL
AT
E T
HIC
KN
ESS
STRI
NG
LEN
GT
H
MIN
IMU
M C
REEP
AG
E
LIN
E M
ETA
L (T
rans
f. en
d)
LIN
E M
ETA
L (A
ir en
d)
FLA
NG
E LE
NG
TH
PORC
ELA
IN L
ENG
TH
AIR
EN
D L
ENG
TH
TRA
NSF
ORM
ER E
ND
LEN
GT
H
TO
P PL
AT
E D
IAM
ETER
FLA
NG
E BO
LT H
OLE
DIA
MET
ER
NU
MBE
R O
F FL
AN
GE
BOLT
HO
LES
WEI
GH
T (k
g)
MA
X. P
ORC
ELA
IN D
IAM
ETER
FLA
NG
E D
IAM
ETER
FLA
NG
E BO
LT C
IRC
LE D
IAM
ETER
FLA
NG
E G
ASK
ET S
EAT
DIA
MET
ER
TRA
NSF
ORM
ER E
ND
DIA
MET
ER
PRO
TEC
TED
CRE
EPA
GE
CA
NT
ILEV
ER W
ITH
STA
ND
(kN
)
TIG
HT
NES
S T
EST
24
HO
URS
(bar
g)
TO
TA
L LE
NG
TH
PART
IAL
DIS
CH
ARG
E (k
V)(1
0pC
Max
.)
LIG
HT
NIN
G IM
PULS
EW
ITH
STA
ND
(VO
LTS)
POW
ER F
REQ
UEN
CY
WIT
HST
AN
D (k
V) -
1 M
IN.
REFE
REN
CE
CU
RREN
T (A
)
MA
X. P
HA
SE T
O G
ROU
ND
(kV)
RAT
ED V
OLT
AG
E (k
V)
Un17.5
24
36
Up125
150
200
Ir63008000
1000012500160002000063008000
1000012500160002000063008000
100001250016000200002500031500
Uy17.5
24
24
Up50
70
95
26
36
54
1.4
1.4
1.4
4
5
4
5
4
5
L665675
695705
765775
795805
865875
895905
9551135
L1290
310
305
325
320
340
375
L2375385
395
460470
480
545555
565
615760
L3165
250
335
L48090
100
8090
100
8090
100
125
L5130
130
130
180300
REFERENCE PERFORMANCE
Voltage Mechanical PORCELAIN
DIMENSIONS (mm)
L6165
185
165
185
165
185
220
L720
20
20
25
L8205
290
375
430
650
870
160
240
320
D1250290330400460550250290330400460550250290330400460550660820
D2255300340410470560255300340410470560255300340410470560670830
D3290350400450535620290350400450535620290350400450535620720930
D4335400450500590680335400450500590680335400450500590680780980
D5445500545625685780445500545625685780445500545625685780900
1070
D6300350395470535630300350395470535630300350395470535630750920
d1520
22
1520
22
1520
22
n212
16
12
16
12
16
24
6988
10513316820785
107126161192241101126149185230288364502
Minimum Oil Leveln2 holes
D3 D4
5
d
L7
L
L2L1
L6 L4 L3 L520
D6 D5D1D2
L8
90°
Figure 1
Type HETA Voltage Range 17.5kV to 36kV
High current bushings for transformer to phasebusbar isolated connections
4
40
T2
a/2
20
aA1
85A3
A2
20
85
40n4 Holes
t
t/2
T1
T3
n3 Holes
Figure 3
Type HETA Voltage Range 17.5kV to 36kV
High current bushings for transformer to phasebusbar isolated connections
40
a/2 20
aA1
85A3
A220
85
40n4 Holes
t
t/2
T1
T3
n3 Holes
Figure 2
NU
MBE
R O
F H
OLE
S
HO
LE P
ITC
H
TH
ICK
NES
S
SPA
CIN
G
LIG
HT
NIN
G IM
PULS
EW
ITH
STA
ND
VO
LTS
(kVp
)
WID
TH
NU
MBE
R O
F H
OLE
S
HO
LE P
ITC
H
TH
ICK
NES
S
SPA
CIN
G
WID
TH
REFE
REN
CE
CU
RREN
T (A
)
ARR
AN
GEM
ENT
RAT
ED V
OLT
AG
E (k
V)
Un17.5
24
36
Up125
150
200
Ir63008000
1000012500160002000063008000
1000012500160002000063008000
100001250016000200002500031500
Fig23
4
23
4
23
4
A1180120150200120150180120150200120150180120150200120150200240
A2160250290340430530160250290340430530160250290340430530610700
A325
25
25
a60
50
605060
50
605060
50
6050
60
n364684664684664684688
T1150120150200300350150120150200300350150120150200300350400480
T2
75100120140190
75100120140190
75100120140190220250
T33025
3025
3025
30
t506050
506050
506050
60
n46468
12146468
12146468
12141616
REFERENCE TERMINALS (FIGURES 2, 3 & 4)
Air End Transformer End
5
1.2
1.1
1.0
0.9
0.8
0.7
0.60 10
0
10
20304050
20
Tc - To(K)
To - Ta(K)
RA
TIN
G F
AC
TO
R 'R
'
30 40 50
SA
SO
Connections to Bushing - Section SA and SO
Fig. 6 identifies the connections made to the bushing; these are the air end SA and the
transformer end SO. The reference conditions for the bushings are based on defined
values of current density in the copper connections as follows:
SA = 1.5 A/mm2
SO = 2.5 A/mm2
Operating the bushing at higher air temperatures will demand some decrease in the
value SA while restricted conductor temperature rises will demand some decrease in
value SO. When requested we can advise on specific values.
Selection Procedure
1. Select voltage class (creepage may influence decision).
2. Determine (TO - TA) and (TC - TO) : bushings to IEC 137 allow (TC - TO) = 30K. Other
specifications may reduce this to 20K or 10K.
3. Refer to fig. 5 for rating factor ‘R’.
4. Divide maximum system current by factor ‘R’. This gives minimum current rating in
terms of the catalogue reference temperatures.
5. Add any overload and proximity effect.
6. Select next highest Ir value from catalogue list.
1. HETA 36/200 class.
2. (TO - TA) = 10, (TC - TO) = 20
3. R= 0.82
4. eg 8650A max, therefore
8650/0.82 = 10550A
5. NOT REQUIRED
6. Therefore Ir = 12500 A
Current Rating- Factor ’R’.
The bushing nominal current rating Ir is based on one set of temperature conditions
typical of those found in power transformers connected via phase isolated bus-duct
systems. These reference conditions are:
Oil temperature TO = 90°C
Air temperature TA = 70°C
Max. conductor temperature TC = 120°C
Therefore TO - TA = 20K
Therefore TO - TO = 30K
Consequently, the rating factor ‘R’ for these conditions is defined as 1.0. For other
temperature conditions refer to fig. 5 for the appropriate value. Use of this factor in
determining the correct bushing is described below.
Example
Figure 5. - Rating factor selection chart.
Figure 6. - Connections to bushing.
Type HETA Voltage Range 17.5kV to 36kV
High current bushings for transformer to phasebusbar isolated connections
Figure 4
40
a/2
20
aA1
85A3
A2
20
85
40n4 Holes
t
t/2
T1
T3T2
n3 Holes
6
Features
● The design is compatible with the requirements of IEC 1639 for the GIS to transformer interface. Other dimensions can be provided on request
● The ETG bushing range is provided for a full range of operating ratings to IECand ANSI Standards
● Epoxy resin impregnated paper insulation. Vacuum impregnation of the condenser core gives excellent partial discharge performance
● Oil free solid insulation provides no fire or explosion risk with the bushing
● Design allows for differential expansion across normal operating temperature range
● lnsulation is gas tight and when combined with an effective sealing ring system will provide <10-5 torr litres per second Ieakage
● Connecting flange is also gas tight and incorporates a self grounding test tapping for through life capacitance and tan delta measurement
● Non-standard CT accommodation and corona shields can be provided on request
● All bushings are electrically tested with a simulation of the service arrangement,preventing oil contamination of the gas side
Description
The epoxy resin impregnated paper range provides the very highest standard inbushing technology. Every product is impulse tested as a routine so you can beassured of high reliability and a low cost. With over 30 years experience in the fieldof oil free bushing applications our engineers can support all your through lifeneeds.
The bushings detailed show our product range which is suitable for connecting oilfilled transformers directly to SF6 metalclad switchgear or ducting.
for detailssee opposite
Type ETG Voltage Range 72.5kV to 800kV
Bushings for transformer to gas insulatedswitchgear connections
7
d3
L3 L2
L4
n2xm2
n1xm1t1
d4
S2sealing surfaceRmax
enclosureflange
contact areaon bushing side
bushingflange
6.3
S1 d9
t2d8
L7
d2
L
TRANSFORMER ENDSF6 END
L4 L1
E
L5
D1
D3 D4 L6n3xm3
D2
INT
ERN
AL
DIA
MET
ER O
FG
AS
SID
E SE
ALI
NG
FA
CE
INT
ERN
AL
DIA
MET
ER O
FG
AS
SID
E EN
CLO
SURE
FLA
NG
E
INT
ERN
AL
DIA
MET
ER O
FG
AS
SID
E EN
CLO
SURE
OU
TER
DIA
MET
ER O
FG
AS
SID
E T
ERM
INA
L
NO
. OF
HO
LES
x D
IAM
ETER
GA
S SI
DE
TER
MIN
AL
PCD
GA
S SI
DE
LEN
GT
H
GA
S SI
DE
TER
MIN
AL
TH
REA
D D
EPT
H
GA
S SI
DE
TER
MIN
AL
TH
ICK
NES
S
OVE
RALL
LEN
GT
H
MA
XIM
UM
PH
ASE
TO
GRO
UN
DVO
LTA
GE
(kV)
LIG
HT
NIN
G IM
PULS
EW
ITH
STA
ND
VO
LTA
GE
(kVp
)
POW
ER F
REQ
UEN
CY
WIT
HST
AN
D V
OLT
AG
E (k
V) 1
Min
.
SWIT
CH
ING
IMPU
LSE
WIT
HST
AN
D V
OLT
AG
E (k
Vp)
RAT
ED C
URR
ENT
(A)
RAT
ED V
OLT
AG
E (k
V)
Ur
72.5
72.5
123
123
145
145
170
170
245
245
420
525
800
Up
325
325
550
550
650
650
750
750
1050
1050
1425
1550
2050
Us
*
*
*
*
*
*
*
*
*
*
1050
1175
1500
Ir
1250
2000
1250
2000
1250
2000
1250
2000
1250
2000
2000
2000
2000
Up
140
140
230
230
275
275
325
325
460
460
630
680
800
Uy
42
42
71
71
84
84
98
98
142
142
243
303
462
L
740
1010
1050
1120
1190
1560
2410
2560
3595
L4
330
520
770
1050
1340
L2min
30
125
L3min
20
25
*
t1
70
110
*
n1x m1
4xM12
*
d2
99
139
60
d3min
250
300
450
540
630
S1max
200
220
450
540
500
S2min
260
280
510
600
630
t2
285
305
535
640
720
d8
315
335
565
690
764
d9
16
20
23
n2xm2
8xM12
16xM12
16xM16
28xM20
L7
25
30
30
33
33
L5
150
220
200
355
L1
260
340
380
450
570
1160
1210
1900
E
30
300
600
D1
90
110
145
200
329
487
D3
250
290
400
500
600
D4
290
335
450
560
660
n3xm3
8x15
12x15
12x20
12x24
16x24
L6
18
22
25
D2
90
110
175
200
d4
200
220
450
540
500
REFERENCE RATING GAS SIDE DIMENSIONS AND TERMINOLOGY AS IEC61639 TRANSFORMER SIDE
GA
S SI
DE
FLA
NG
E PC
D
EXT
ERN
AL
DIA
MET
ER O
FG
AS
SID
E FL
AN
GE
EXT
ERN
AL
DIA
MET
ER O
FG
AS
SID
E SE
ALI
NG
FA
CE
GA
S SI
DE
FLA
NG
E FI
XIN
GH
OLE
DIA
MET
ER
GA
S SI
DE
FLA
NG
E T
HIC
KN
ESS
MO
UN
TIN
G F
LAN
GE
HEI
GH
T
TRA
NSF
ORM
ER S
IDE
LEN
GT
H
MIN
IMU
M E
ART
H B
AN
D
TRA
NSF
ORM
ER S
IDE
DIA
MET
ER
TRA
NSF
ORM
ER S
IDE
FLA
NG
E PC
D
EXT
ERN
AL
DIA
MET
ER O
FT
RAN
SFO
RMER
SID
E FL
AN
GE
TRA
NSF
ORM
ER S
IDE
FIX
ING
HO
LES
NO
. x D
IAM
ETER
TRA
NSF
ORM
ER S
IDE
FLA
NG
E T
HIC
KN
ESS
TRA
NSF
ORM
ER S
IDE
TER
MIN
AL
DIA
MET
ER
GA
S SI
DE
FIX
ING
SC
REW
SN
O. x
DIA
MET
ER
Type ETG Voltage Range 72.5kV to 800kV
Bushings for transformer to gas insulatedswitchgear connections
8
Type EGA Voltage Range 145kV to 525kV
Direct connection between metalclad SF6 switchgear and outdoor equipment
The bushings in the EGA range are suitable for connecting outdoor equipment to
SF6 metalclad switchgear or ducting and may be mounted vertically, horizontally or
at any angle between.
The primary insulation used in this range of bushings is condenser graded, epoxy
resin impregnated paper - ERIP. The bushings are intended as alternatives to
conventional gas- filled porcelain. Use of ERIP provides a compact bushing design
which is completely free of oil. The lack of oil or pressurised gas in the bushing
greatly minimises the risk of fire or explosion.
Used extensively for many years, ERIP has a proven reliability record in many
applications and is virtually free of partial discharges at test voltages.
The cast epoxy insulation has inherent gas tight properties and combined with an
effective sealing ring system provides security for the gas environment and a gas
leakage rate of <10-5 torr litres per second is guaranteed. The design caters for the
effect of differential expansion across the normal operating temperature range.
The connecting flange is impervious to gas and incorporates a self grounding test
tapping for capacitance and tan delta measurement during periodical maintenance.
The bushing flange dimensions and design of the SF6 terminal can be adapted to
suit the specific requirements of the SF6 equipment. The design of the outdoor
terminal can also be adjusted to suit connections to the outdoor equipment or
overhead lines.
Condenser bushings for direct connection between metalcladSF6 switchgear and outdoor equipment
9
L
L1 L2
L5100
d1
ZxiD3 D2 D1
d2
L4 L3
OU
TD
OO
R EN
D T
ERM
INA
L D
IAM
ETER
SF6
END
TER
MIN
AL
DIA
MET
ER
FLA
NG
E FI
XIN
GN
o. O
F H
OLE
S x
DIA
MET
ER
FIX
ING
FLA
NG
E O
UT
SID
E D
IAM
ETER
FIX
ING
FLA
NG
E P.
C.D
.
SF6
END
INSU
LAT
ION
DIA
MET
ER
OU
TD
OO
R PO
RCEL
AIN
CLE
ARA
NC
E
FLA
NG
E H
EIG
HT
SF6
END
LEN
GT
H
SF6
END
INSU
LAT
ION
LEN
GT
H
OU
TD
OO
R LE
NG
TH
TO
TA
L LE
NG
TH
MA
XIM
UM
PH
ASE
TO
GRO
UN
DVO
LTS
(kV)
LIG
HT
NIN
G IM
PULS
EW
ITH
STA
ND
(VO
LTS)
POW
ER F
REQ
UEN
CY
WIT
HST
AN
D (k
V)
SWIT
CH
ING
IMPU
LSE
WIT
HST
AN
D (V
OLT
S)
RAT
ED C
URR
ENT
(A)
RAT
ED V
OLT
AG
E (k
V)
Un
145
170
245
300
420
420
525
525
Up
650
750
1050
1050
1425
1425
1675
1800
Us
-
-
-
850
1050
1050
1175
1300
In
2000
2000
2000
2000
2000
4000
4000
2000
Up
275
325
460
460
630
630
740
860
Uy
84
98
142
173
243
243
303
303
L
2040
2280
3195
3405
4465
4465
5090
5610
L1
1670
1870
2690
2900
3860
3860
4400
4810
L2
370
410
505
505
605
605
690
800
L3
290
330
400
400
500
500
585
660
L4
200
200
300
350
400
400
400
400
L5
1250
1450
2150
2320
3200
3200
3740
4150
D1
140
160
220
270
329
375
375
375
D2
290
290
400
532
532
532
532
532
D3
335
335
450
570
570
570
570
570
d1
40
40
40
60
60
80
80
80
d2
160
160
160
170
203
220
220
203
Zx diam i
12x16
12x16
12x23
16x18
16x18
16x18
16x18
16x18
REFERENCE RATING DIMENSIONS
Terminal and flange dimensions may vary to suitrequirements of both SF6 and outdoor equipment.
Type EGA Voltage Range 145kV to 525kV
Condenser bushings for direct connection between metalcladSF6 switchgear and outdoor equipment
10
Trench® Austria GmbHPaschinger Strasse 49Postfach 13A-4060 Linz-LeondingAustriaPhone: 43-732-6793-0Fax: 43-732-671341
Trench® Brasil LtdaVia Expressa de Contagem, 2685Contagem, Minas GeraisCEP 32370-485BrazilPhone: 55-31-3391-5959Fax: 55-31-3391-1828
Trench® ChinaMWB (Shanghai) Co., Ltd.No. 3658, Jiancheng RoadMinhang, ShanghaiPeoples Republic of China200245Phone: 86-21-54720088Fax: 86-21-54723118
Trench® High Voltage Products Ltd., ShenyangNo. 2 Zhengliang Er. RoadJing Shen Xi San StreetDao Yi Economic Development ZoneShenyang 110136 P.R. ChinaPhone: 86-24-89722688Fax: 86-24-89737200
Trench® LimitedBushing Division432 Monarch AvenueAjax, OntarioCanada L1S 2G7Phone: 905-426-2665Fax: 905-426-2671
Trench® LimitedCoil Product Division71 Maybrook DriveScarborough, OntarioCanada M1V 4B6Phone: 416-298-8108Fax: 416-298-2209
Trench® LimitedInstrument Transformer Division390 Midwest RoadScarborough, OntarioCanada M1P 3B5Phone: 416-751-8570Fax: 416-751-6952
Trench® LimitedPower Line Carrier Division815 Middlefield Road, Unit 6AScarborough, OntarioCanada M1V 2P9Phone: 416-291-8544Fax: 416-291-5581
Trench® France S.A.16, Rue du Général CassagnouB.P. 70 F-68 302St. Louis, CedexFrancePhone: 33-3 89-70-2323Fax: 33-3 89-67-2663
Trench® Germany GmbHNürnberger Strasse 199D-96050 BambergGermanyPhone: 49-951-1803-0Fax: 49-951-1803-224
Trench® Switzerland AGLehenmattstrasse 353CH-4028BaselSwitzerlandPhone: 41-61-315-51-11Fax: 41-61-315-59-00
Trench® (UK) LimitedSouth DriveHebburnTyne & WearNE 31 1 UWPhone: 44-191-483-4711Fax: 44-191-430-0633
Trench Facilities
www.trenchgroup.com
The Trench Group is your
partner of choice for electrical
power transmission and
distribution solutions today;
and for the development of
your new technology solutions
of tomorrow.
E 322.30Subject to change without notice (05.2006)Printed in Canada.