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to create any combination of feeders with the required hVpt SUbStAtIonS
protection and control. No pre-build for the future is To date, over 70 HVPT substations have been installed in
needed, as it is only necessary to plan for what is needed Manitoba, in a variety of areas including remote locations,
that day. If additional load is required, another HV padmount large 40,000+ housing developments, and various
transformer can be installed in parallel with the existing manufacturing plants and mines. The stations, both concept
one. In the larger stations, the steel work, the foundations, and in-service, have been installed in as little as six months.
and the yard of the future are often installed at the time If the HVPT substations used a transformer from stock, the
of the initial construction. This measure incurs additional installation could be shortened to as little as a couple of
expenses, along with the associated maintenance costs, months.
for an unknown future – in many cases never realized.
The installations have saved Manitoba Hydro millions of
6. Easy Installation and Minimal Maintenance – The HVPT dollars. These savings are primarily due to reduced property
fits onto a trailer and can be shipped completely assembled costs; the reduction in the civil works of the station yard;
to your site. Installation and removal is easy due to the the elimination of the overhead structures, foundations, and
design, which allows both HV and LV cable terminations fence; and reduced transformer costs.
to be left in place. The only maintenance required is the
periodic cleaning of the HV compartment. There is no on- Manitoba Hydro recognizes HVPT substations as the ideal
load tap changer, regulators are used on the secondary, substation design. The HVPT benefits make it ideally suited
and there is no conservator tank, which eliminates most for the southern hemisphere, with interest being drawn
commons sources for moisture or carbon contamination of from Paraguay and Saudi Arabia. The HVPT works well with
the oil. The HVPT substation does not require an outage for renewable energy projects from 1 MVA to 15 MVA in size.
ongoing maintenance, whereas a conventional substation With the continued cost savings and increased efficiencies,
can require 8-12 hours. the HVPT substations will continue to be used.

7. Run-to-end-of-life – The transformer is designed to be AppLICAtIonS FoR thE CARIbbEAn
easily moved on or off the foundation, and is designed Some of the benefits of the HVPT substation are ideally
to be in place until end-of-life with minimal maintenance. suited for distribution systems in the Caribbean. Its small,
Transformer replacement requires approximately eight compact size can withstand natural disasters such as
hours.
hurricanes. No exposed wire eliminates the potential for
copper theft and its small footprint allows for more efficient
8. A Power Transformer in a Distribution Mindset – The installation locations.
tank and internals of the transformer, including the core
and windings, are designed to the same standard and Gerald H. Geall and Lukas Douglas,
specifications as power transformers. The fact that they Manitoba Hydro International Ltd
were conceived with a distribution mindset results in lower
cost and shorter lead times. The reduced cost allows
Manitoba Hydro to afford a stock of a limited number of AboUt mAnItobA hydRo IntERnAtIonAL Ltd. (mhI)
these transformers, for emergency replacement and/or very For 30 years, MHI has provided utility management, consulting,
and training services to over 75 countries around the world. As a
short lead times.
wholly owned subsidiary of a renowned Canadian energy utility,
MHI assists clients to deliver electricity and natural gas efficiently,
effectively, and in a sustainable manner. Leveraging its international
experience and the parent utility’s methods and technologies, MHI
offers customized services, sustainable results, and true value to
clients.
From owner’s expert consulting to complete project management,
MHI has over a decade of experience in HVPT substation
engineered design, procurement, and installation.

For more information on how to improve substation efficiency,
contact Lukas Douglas at [email protected].

Single hV padmount transformer for Water treatment plant
industry Journal 20