Globalizing know how in multi-turn coils - Voith Hydro

In fact, there are several customers
and machines in Canada and in the
U.S. that already have Micalastic
coils installed and supplied by the
Brazilian location of Voith Hydro in
the past. These Micalastic coils
have performed absolutely flawlessly
since that time.
Design
Computerized design tools allow
modeling of the performance of the
entire generator. Optimization of the
coil design with respect to losses,
heating and overall rating is performed.
Based on extensive test
results on completed projects, the
calibrated calculation allows the
winding performance to be guaranteed.
June 2009 I 18 I HyPower
The range of applicability for multiturn
coil windings is up to 150 MVA
and voltages up to 15.75 kV. Higher
voltages are possible by request.
The new coil manufacturing equipment
in Mississauga was commissioned
in January 2009 and the
impregnation system following in
April. Micalastic coil qualification
trials started in May and coils
will be commercially available by
August 2009.
This indeed is an exciting chapter
for Voith Hydro, as it again demonstrates
its technological leadership
in the supply of multi-turn coils
through its significant investment
in equipment and Micalastic technology
in Mississauga, Canada.
Micalastic Insulation System, the Voith Hydro VPI Technology
Relative dielectric constant, �r , 20 °C, 50 Hz / 60 Hz
Tang � at 0.2 UN , 20 °C, 50 Hz / 60 Hz
1
/2 (Tang � / 0.6 UN – Tang � / 0.2 UN ), 20 °C, 50 Hz / 60 Hz
Max. � Tang � / step 0.2 UN (from 0.2 UN to 1.0 UN )
Breakdown strength, 50 Hz / 60 Hz, slot side
Single stator bars (half coil)
Surge voltage endurance along slot
Test voltage, 50 Hz / 60 Hz, UPRMS , 1 min
Single stator bars (half coil)
Finish winding assembly
Ratio between test DC and AC voltage UpDC / UpAC Test voltage, conductor strands, 50 Hz / 60 Hz
Permissible surge voltage on windings in operation
Maximum permissible temperature IEC 62114 / IEC 60034-18
Flammability: as per model test
Test voltage, 50 Hz / 60 Hz, UPRMS , 1 min – Leads
kV/mm
kV
kV
kV/mm
kV
kV
kV
V
kV
kV
°C
kV
Micalastic records in hydro
Author
William.Malus@voith.com
≈ 4
� 1.5% / � 1.0% – w/o resp. w. ICP
� 0.15% / � 0.10% – w/o resp. w. ICP
� 0.25% / � 0.10% – w/o resp. w. ICP
� 25
Up � 6.0 UN at slot side
Up � 3.0 UN at front side
� 50 (1.2 / 50 �s wave)
Us � (4 UN + 5 kV) at slot side
ELECTRICAL EXPERTISE
We look forward to passing on the
great benefits of this highly engineered
product to our customers
all over the world.
� Insulation system started and
continuously developed since 1957
� More than 55 million accumulated
service hours
� More than 300,000 bars and coils
supplied
� More than 6,300 accumulated service
years
� Applied to approximately 500 hydro units
worldwide over 5 MVA
William Malus
Chief Operating Officer,
Mississauga, Canada
Standard: Up = (2 UN + 6 kV)
(higher values can be applied after request)
Up = (2 UN + 1 kV)
1.7
220
� 3.5 UN at Uphase-core
� 5 UN at Uphase-phase
155, Class F
Self-extinguishing
1.5 x Up
UN = rated (line-to-line) voltage
33