— INSULATION AND COMPONENTS MICAFIL RIS Transformer Bushings EasyDry / DMB-OA 24–170 kV — MICAFIL RIS Transformer Bushings EasyDry / DMB-OA 24–170 kV • MICAFIL EasyDry bushings feature a moisture resistant construction which is oil- and paper-free. That ensures the long lifetime, safety and reliability essential to maximize the availability of transformer assets. • Building on over 100 years experience in bushings, ABB has focused on creating an innovative technology for fast delivery to suit a wide range of customer applications.
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INSULATION AND COMPONENTS MICAFIL RIS …...The EasyDry transformer bushing is a resin molded polymeric fiber RIS technology bushing with a silicone rubber insulator. This means that
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• MICAFIL EasyDry bushings feature a moisture resistant construction which is oil- and paper-free. That ensures the long lifetime, safety and reliability essential to maximize the availability of transformer assets.
• Building on over 100 years experience in bushings, ABB has focused on creating an innovative technology for fast delivery to suit a wide range of customer applications.
ABB manufacturing locations for bushings: Alamo, TN, USA | OIP, RIS Guarulhos, Brazil | OIP Hefei, China | OIP, RIP Khotkovo, Russia | RIP Ludvika, Sweden | OIP, RIP Vadodara, India | OIP Zurich, Switzerland | RIP, RIS OIP = Oil Impregnated Paper bushings
RIP = Resin Impregnated Paper bushings
RIS = Resin Impregnated Synthetics bushings
R&D centers: Baden-Dättwil, Switzerland Bangalore, India Beijing, China Krakow, Poland Ladenburg, Germany Raleigh, USA Västerås, Sweden
—ABB, the world leader in high voltage bushing technologyGlobal experience and resources
The first MICAFIL Resin Impregnated Paper (RIP) bushings were developed in the 1960s, and since then the factory in Zurich, Switzerland has specialized in dry type bushing technologies. For more than 40 years we have successfully produced tailor-made, high quality dry bushings. ABB is characterized by its outstanding technical performance and experience. During the long history of developing and producing dry bushings, ABB has always been well known for its innovation by setting new standards for dry bushings.
ABB is continuously striving for new, innovative solutions to meet our customers’ application needs. The continuous and determined work on research and development, involving the profound knowledge of the unique ABB R&D global network, enables us to provide you with state-of-the-art
dry bushing technology: EasyDry high voltage transformer oil-air bushings. This modern RIS (Resin Impregnated Synthetics) bushing technology sets new standards regarding quality, reliability, safety and lead time.
The EasyDry bushing family ideally fits into ABB’s product portfolio of environmental friendly and high quality components for the transmission and distribution of electrical energy. In general, the aim of electric utilities is to continuously increase efficiency and performance of their assets in addition to the ambitious targets of improved availability, higher safety standards and cost reduction. ABB’s EasyDry bushing provides a valuable contribution to achieving better overall performance figures.
The EasyDry standard line will be the right choice when equipping your next transformer. In this brochure we will tell you why.
The ABB group has more than 100 years of experience in different bushing technologies. This experience includes comprehensive Research and Development (R&D) and testing resources, especially in the areas of high voltage, engineering, materials research and applied physics. We produce quality bushings in seven locations all over the world.
—State of the art bushing technologyCompact and reliable design
The EasyDry transformer bushing is a resin molded polymeric fiber RIS technology bushing with a silicone rubber insulator. This means that the condenser core is molded in its final shape (picture 1) and the silicone rubber insulator is directly molded as one piece on the core (picture 2). In this way, the insulator and the condenser core become tightly bound to one another. The optimized process and high quality materials make the bushing partial-discharge free and ensure low dielectric losses. The bushing design is completely oil- and paper-free and does not contain water-absorbent materials.
—EasyDry common specifications
EasyDry bushing cross-section
Copper terminal (air side)
Clamp
Silicone insulator
Condenser core
Mounting flange
Current transformer extensions, if required
Terminal shield (oil side)
Measuring tap
—01 Molding of condenser core—02 Molding of silicone insulator—03 New 245 kV high voltage test laboratory
—01
—02
—03
The EasyDry bushing consists of a resin molded condenser core, main flange and silicone rubber insulator. The condenser core is manufactured using aluminium tube or copper conductor and then wound with a fiber condenser core utilizing aluminum foils for electrical field control. The condenser core is then molded under vacuum with a high temperature epoxy resin into its final shape. Therefore the condenser core needs no machining. The molding is performed under vacuum, in a controlled and hermetically sealed environment. The aluminium flange is directly assembled on the
condenser core with a multiple O-ring system creating an oil- and gas-tight sealing system. In contrast to some traditional designs, the bushing’s terminals are made of one piece. Both, the cable bolt and removable solid rod conductor, are fitted with a clamp at the top of the bushing. We are proud of our leading position in high voltage bushings by providing our customers with pro-found expertise in this state-of-the-art technology. This new bushing technology combines the best advantages of both OIP and RIP technologies.
Common specifications Application Oil-air transformer bushing for mineral oil, other oils on request Classification Dry, fine capacitive graded, resin molded bushing Min. ambient temperature – 40 °C Altitude of installation <1000m, higher level of altitude on request Pollution level Very heavy Mounting angle Vertical to horizontal Measuring tap 3 kV Standards IEC 60137 (2017) and IEEE C57.19.00 (2004) and C57.19.01 (2000)
The EasyDry transformer bushing combines the benefits of RIP and OIP bushings into one compact product. The EasyDry bushings share the OIP performance having an excellent resistance to moisture absorption during storage and transportation, and at the same time provide the same excellent overload characteristics and thermal values and reliability you expect from an RIP bushing. Furthermore, the bushings are constructed of fire-resistant materials. This makes the bushing extremely safe for both personnel and systems.
Easy to use, maintenance-free• No maintenance or constant monitoring
necessary• Installation, storage and transportation is
possible at any angle
Excellent electrical and thermal properties• Partial-discharge free up to double service
voltage• High thermal endurance (class E, 120 °C)• Low dielectric losses (tan δ ≤ 0.40 %)
Superb design, reliable performance• EasyDry bushings utilize only materials which are
moisture resistant, making bushing storage and transportation much easier and practical
• Easy handling and installation of the bushing thanks to the reduced number of components
• Single-piece terminal without joints guarantees low resistance current path
• One-piece, direct-molded silicone insulator provides superior moisture and contamination resistance
Oil- and paper-free bushing, highest operational safety• The EasyDry design effectively prevents
explosions since they are oil- and pressure-free• The EasyDry bushing’s core material makes it
Environmental friendly• The materials are selected to provide the lowest
possible environmental impact over the whole product life cycle
• Lower carbon footprint than other bushing technologies
Standard bushing with better than standard performanceEasyDry transformer bushings are specified and tested according to the IEC 60137 (2017) and IEEE C57.19.00 (2004) and C57.19.01 (2000) Standards. The bushings not only meet, but exceed the requirements in the relevant standards due to the low dielectric dissipation factor (tanδ) and partial discharge performance. The minimum allowed ambient temperature of – 40 °C enables EasyDry to perform even in the most demanding conditions.
Please consult ABB Switzerland for conditions that are outside of the standard specification above.
—01 Rain on the way to storage – no problem—02 Preparation for temperature rise test—03 EasyDry transformer bushing. Standard bushing with best benefits—04 Factory acceptance test with customers
Recommendation for bushing installation The distance from the bushing’s lower part to the earthed parts depends on the shape of the surrounding parts as well as on the quality and condition of the transformer oil. The recommended minimum distances A (mm) to be used under standard conditions are shown in Fig. 16 and the table below.
DMB-OA d6 (mm) Up (kV)* A (mm)
24, 36, 52 109 50 – 105 80
72.5 109 140 90
160 100
123 134 185 115
255 145
180 185 140
255 170
145 134 275 170
310 210
180 275 195
310 225
170 134 325 210
365 230
180 325 235
365 255*transformer test voltage
Fig. 21
—Dimensions and installation
Bushing dimensions
∅D4
∅D3
1
3
2
30°
6×60°30°
Fig. 10 Fig. 11
1
3
2
∅D4
∅D3
15°
12×30°
Fig. 12
Flange detail
∅D8
∅D2
n×∅16
4
18
Rated Voltage CT Extension Fig L9
24 0–100 24 85
200–600 25 20
36 0–100 24 85
200–600 25 20
52 0–100 24 65
200–600 25 20
72.5 0–100 24 30
200–600 25 20
Split solid rod conductor for 24–72 kV The removable conductors for 24, 36, 52 and 72 kV are split. The divided point of the rod conductor have the following characteristics:
L9 110
Fig. 24
One-piece solid rod conductor for 123–170 kVFor 123–170kV the solid rod conductor are unseparated by standard. Split conductors are available on request.
Type designationNotes1 Current conductor C = Cable bolt (C1: current refers to 665mm² copper cable, C2: current refers to 400mm² copper cable) R = Removable solid rod conductor F = Fixed conductor
2 The dimensions L and L16 in the table are valid for L6 = 0 mm. For L6 > 0 mm, add L6 to L respectively L16.
3 The weights in the table are valid for L6 = 0 and 600 mm. The bushing weight for other values of L6 are in the outline drawing.
Technical data for bushing selection
Type and drawing Electrical characteristics Insulator data Mechanical design
Weight DimensionsIEC 60137 (2017) Current IEEE C57.19.01 (2000) Current Total Oil side Air side Flange Oil side terminal Shield
Out
line
dra
win
g n
umb
er
Bus
hin
g d
imen
sio
ns
Rat
ed c
urre
nt
Cur
rent
co
nd
ucto
r N
ote
1
Rat
ed v
olt
age
Pha
se t
o g
roun
d
AC
tes
t vo
ltag
e d
ry/w
et
Lig
htni
ng
imp
ulse
vo
ltag
e, 1
.2/5
0 μ
s
Max
imum
op
erat
ing
cur
rent
in
resp
ect
to C
T ex
tens
ion
(mm
)
No
min
al s
yste
m v
olt
age
Rat
ed m
ax. l
ine-
to-g
roun
d v
olt
age
AC
tes
t vo
ltag
e d
ry /
wet
Lig
htni
ng
imp
ulse
vo
ltag
e, 1
.2/5
0 μ
s
Max
imum
op
erat
ing
cur
rent
in
resp
ect
to C
T ex
tens
ion
(mm
)
Th
erm
al s
hort
-tim
e cu
rren
t
Cre
epag
e d
ista
nce
Arc
ing
dis
tan
ce
Can
tile
ver
test
load
, 1 m
in.
Can
tile
ver
op
erat
ing
load
Wei
ght
wit
h C
T =
0 m
m N
ote
3
Wei
ght
wit
h C
T =
60
0 m
m N
ote
3
Bus
hin
g le
ng
th w
ith
term
inal
an
d sh
ield
Not
e 2
Cur
rent
tra
nsfo
rmer
ext
ensi
on
Low
er c
ore
len
gth
No
te 2
Co
re d
iam
eter
Insi
de
tub
e d
iam
eter
Term
inal
: d
ista
nce
fro
m t
he
flan
ge
pla
te
Cab
le b
olt
: d
ista
nce
fro
m t
he
flan
ge
pla
te
Hei
ght
of
hea
d (m
axim
um)
Hea
d d
iam
eter
Max
. sh
ed d
iam
eter
Term
inal
dia
met
er
Top
det
ail
Pit
ch c
ircl
e d
iam
eter
Out
sid
e fl
ang
e d
iam
eter
Sea
ling
are
a: m
in. d
iam
eter
Sea
ling
are
a: m
ax. d
iam
eter
Flan
ge
dim
ensi
ons
Co
nd
ucto
r d
iam
eter
Max
imum
dia
met
er o
f d
rill
hole
Thi
ckn
ess
of
flat
ter
min
al
Op
enin
g
Shi
eld
dia
met
er
Shi
eld
len
gth
Shi
eld
len
gth
bel
ow
L16
Bo
tto
m d
etai
l No
te 5
Um Um/√3 AC BIL Ir at CT 0 100 200 300 400 500 600 Usys UL-G AC BIL Ir at CT 0 100 200 300 400 500 600 Ith 2sec Lt L6 L16 D1 d3 L2 L4 L5 D5 D6 d2 D3 D4 D2 D8 d4 d8 a1 d5 d6 c6 c7
Fig. A kV kV kV kV A A A A A A A kV kV kV kV A A A A A A A A mm mm N N kg kg mm mm mm mm mm mm mm mm mm mm mm Fig. mm mm mm mm Fig. mm mm mm mm mm mm mm Fig.
When making your enquiry please specify he following:
Type:
Drawing no: 1ZCD
Quantity:
Voltage Current
24 kV 800 A
36 kV 1,000 A
52 kV 1,250 A
72.5 kV 1,600 A
123 kV 2,000 A
145 kV 2,500 A
170 kV
Company name
Name / First name
Phone
Email
Country of Installation
End customer name
Project name
Our order confirmation includes drawings of the bushing and a detailed bushing data sheet. Custom modificationsOn request, ABB can make custom modificationsin areas such as flange dimensions, terminal variants, other lower part lenghts and applications for other oils than mineraloil. We are happy to provide information on feasibility, price and delivery time of such custom modifications.
— Note
We reserve the right to make technical changes or modify the contents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail. ABB Switzerland Ltd does not accept any responsibility whatsoever for potential errors or possible lack of information in this document. We reserve all rights in this document and in the subject matter and illustrations contained therein. Any reproduc- tion, disclosure to third parties or utilization of its contents – in whole or in parts – is forbidden without prior written consent of ABB Switzerland Ltd.