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SEPTEMBER 5 - 7, 2018
High Voltage Pad-mount Transformer
SEPTEMBER 5 - 7, 2018
What is the High Voltage PadmountTransformer(HVPT) Substation?
Traditional substation vs. HVPT
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HVPT History• In order to reduce its outlay in distribution, Manitoba
Hydro investigated alternative solutions that would save in capital costs and land use while increasing reliability and safety.
• Manitoba Hydro was also facing the need to replace/refurbish many substations reaching their End of Life.
• The idea to make a High Voltage “Distribution Style” transformer was explored.
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HVPT History• Working with Partner Technologies Inc., Manitoba Hydro
researched and created the HVPT to realize their objectives.
Transformer Sizes Different Primary Voltages
Different SecondaryVoltage
1.5 MVA to 20 MVA Up to 138 kV 5 to 34.5 kV
• Can be larger, however loses some of the benefits • In Research: 230 kV Primary Voltage. Can be done but
hasn’t been yet.
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HVPT Details
• A HVPT has no energized external parts.
• No fencing required.• Suitable for any climate;
environmentally friendly.• Utility, residential, commercial and
industrial applications.• All station components separate – i.e.
regulators, switch gear, capacitors, and station service transformers.
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Benefits – Land Savings• Up to 75% in land savings. No need for a large station
structure, station yard and fencing.• In an industrial setting, the HVPT transformer can be
installed in spaces as small as 20 sq. meters.
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Benefits - Reliability• Smaller than your conventional substation, HVPT stations can
be installed closer to your site. • Shorter feeders, minimize voltage drops and losses and increase
reliability.• Lack of External Bushings and Parts reduces Wildlife Outages
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Benefits - Safety• The transformer comes with a tamper resistant enclosure
to ANSI C57.12.18 standards. This ensures the transformer is safe from damage from elements, humans, and wildlife.
• The public is also protected without the need for fencing.• The grounding designs exceed
the requirements of IEEE 80 toensure public safety.
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Benefits - TheftManitoba Hydro has seen a decrease in
copper theft at HVPT Substations.
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Benefits – Weather• Storm resistant - covered in dry
nitrogen, no on-load tap changer, no conservator, sealed tank, no fans.
• Operating Temperature Range (for MH) is -40C to +40C(-40F to 104F)
• Can be operated outside of this range
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Benefits – Installation &Maintenance
• The HVPT station fits onto a trailer and can be shipped completely assembled to your site.
• No on site ‘dressing’ of transformer required.• The transformer can then be
simply removed and transferredto different locations.
• Only routine condition monitoringis required.
• Transformers can be “swapped out” and in operation in 24 hours
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Benefits - Timeframe• An HVPT Substation’s Design is very simple (7 – 12
drawings vs 50)• Construction can take less than 2 weeks (including
verification testing• ~26 to 30 weeks from inception to
install• Long lead items
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Benefits - Cost• Installation costs up to 50% less than a conventional
substation while providing full functionality.• Cost savings include:
• Less land procurement• Less additional materials
(no fencing, ancillary parts)• Quicker installation• Defer Capital costs• Avoid stranded assets
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Disadvantages
• Data – Switchgears, ACRs, Regulators• Lack of Fans (ONAN/ONAF)• Onboard tap changer - Regulators
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Innovative Supply Options • Use of the HV Padmounts provides a cost effective
solution able to accommodate the quickly changing demands of the developer/customer
• Flexibility and short lead times avoids stranded assets
• Incorporating automation eliminates concerns regarding multiple smaller supply sites allowing for the distributed station concept to be viable
• “Building Block Approach”
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Innovative Supply Options
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Innovative Supply Options • Waverley West subdivision is
approximately 2600 acres
• Expected to accommodate 40,000 residents in 13,000 homes
• Expected to be completely developed in 10 to 30 years
• Load estimates vary between 70 and 110 MVA
• High level of uncertainty as to load growth rate and horizon load
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Case Study – Modular Employment
• Instead of two 60-MVA substations taking up 8 acres of land, Manitoba Hydro installed ten 10-MVA HVPT stations surrounding the new 13,000 lot Waverley West development.
• Drastically increased the utilization rate (N-1). (60% to 90%)
• Initial savings per station amounted up to $1 million with total net present value savings between $13 and $15 million.
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10 MVA Site
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2x 10 MVA Site
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Installation of an HVPT
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Dead-Front TerminationsSolid Dielectric Primary Connections
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Thank you!
Q & A
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