LDGRB-01 3BSE013177R1 ABB I/O module Programmable Logic Controller for Distributed Control System

Description

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ABB uses high-quality insulating oil with a low
expansion coefficient and high compatibility with
other components in the transformer. Because the
transformer is housed in a solid corrosion-proof
tank that cannot expand, even when hot, the oil
is degassed before installation and the tank is
provided with a patented pressure compensating
system, thereby ensuring safe operations.
Once installed on the seabed, the scope for repairs
is limited. ABB has invested in resources to ensure
that its transformers are maintenance-free and all
components are of the highest quality. Rigorous
testing enables these transformers to enjoy a long,
maintenance-free operating life.
ABB’s shells HV mobile transformers for planning
Nowadays, utilities are asked to prepare detailed
contingency plans, to efficiently manage partial
grid unavailability in case of a power transformer
failure. If failure occurs at a critical substation,
with approximately 500 MVA rated power, revenue
losses can reach up to $0.3 million per day, before
consideration of financial losses caused by damage
to reputation. Two main strategies exist to meet
these challenges: replace the failed unit with a
local spare unit within the same substation (ie, the
traditional N+1 spare approach), or use adaptable
transformers that are compact, rapidly deployable
multi-voltage solutions. The latter approach is
dominant today: a single design with outstanding
flexibility that leads to lower investment costs.
The use of HV Mobile transformers →4, can
significantly reduce reaction time – ie, a compact
single phase unit can be transported and put in to
TRANSFORMERS TO MEET SPECIAL NEEDS
operation in just a few days. It would take weeks or
even months to mobilize a large, spare, standard
three-phase transformer.
Ten years ago, ABB manufactured the world’s
first HV mobile transformer using the robust
shell technology to give utilities a flexible and fast
recovery solution. Thanks to research on materials
and winding configurations, this solution has
been recently improved: it is more compact, with
a higher-rated power and a higher number of
voltage ratios; polyvalent transformers can be
easily transported to any desired substation rapidly,
thereby optimizing grid operation.
Multi-voltage configurations must allow rapid
adaptation to different grid voltage levels, to
allow full working capabilities. The latest Shell HV
mobile units solves these challenges. Successfully
tested in its Córdoba, Spain facility in early 2018,
ABB could then design and manufacture a 550 MVA
three-phase bank composed of modular hybrid
single-phase units, with multi-voltage capacity for
different voltage ratio configurations by means of
400-220/220-138-66/33-20 kV rated voltages →5.
These are the world’s first mobile single-phase
transformer units operating at 420 kV with full
voltage range and capacity OLTC in HV. Now,
emergency conditions will not impact the operation
of these mobile units.
Conceived to provide emergency support for up to
fourteen substations spread over an approximate
1000 km2
area, end users can now count on an
optimized spare fleet instead of turning to the
typical N+1 approach. This single adaptable
modular design solution therefore results in a
significant reduction in investment.