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thE hIgh VoLtAgE pAdmoUnt tRAnSFoRmER grounding designs exceed the requirements of IEEE 80.
An HVPT combines an HV pole mounted switch and HV There are no live exposed parts, ensuring the substation
fuse structure with other padmounted secondary devices is safe from damage from the elements and incidents
in a fully enclosed structure. This innovative design offers involving humans and/or wildlife. With no exposed copper
the ability to re-establish the convenience of the past with wire and the decreased chance of theft, the HVPT is safe
modern technology and equipment, without the costly to the public.
requirements of distribution stations.
3. Small Station Footprint – Without the need for conventional
The HVPT is patented in Canada and the United States. substation material and equipment, the HV padmount
The patents recognize the unique concept of enclosing substation, switching cubicle, circuit reclosers, station
HV equipment above 50 kV, such as a transformer, with an service transformer, and regulator can fit onto a 100 x 100
enclosure to make such equipment suitable to be installed foot lot. This method means that up to 75 per cent less land
without a fence. The HVPT ranges from 1.5 MVA to 12.5 size is required compared to a conventional substation.
MVA with primary voltage from 69 to 145 kV (dual volt ratings
also available) and secondary voltage from 5 to 34.5 kV. 4. Multiple Applications – With its small footprint and short
feeders, the HVPT can be placed almost anywhere, and
The HVPT makes no modifications as to how voltage particularly closer to the load. This method results in applicable
transformation occurs; it only modifies the way a high uses for not only utilities, but residential developments,
voltage transformer connects to the system. In a Delta – commercial buildings (i.e. large manufacturing plants), and
Wye configuration, the low voltage neutral is brought out industrial uses (mining locations).
inside the LV compartment to a fully insulated X0 bushing
with removable ground strip. In a Wye – Wye configuration,
the high voltage neutral is brought out to an H0 bushing
inside the primary compartment. The low voltage neutral is
brought out to an X0 bushing inside the LV compartment.
In a Wye – Delta configuration, the neutral is brought out to
an H0 bushing.

10 mVA, 66 kV hVpt Substation

bEnEFItS oF thE hVpt SUbStAtIon
1. Cost Savings – With no need for a large station
structure, station yard, and fence, cost savings for a HVPT
substation can be up to 50 per cent less than the cost of
a conventional substation. Labour to construct the HVPT Conventional Substation vs. hVpt Substation
substation is approximately 50 per cent less, compared to
a conventional substation. The life cycle cost is lower due 5. Modular Design – The unique size of the HVPT allows
to the minimal maintenance required.
for installation of up to three units in parallel. The distribution
equipment to create the substation (padmount regulators,
2. Safety and Security – The HVPT meets ANSI Standard padmount circuit reclosures, padmounted switching
C57 with its secure and tamperproof enclosure, and the cubicles, and padmounted transformers) is readily available

industry Journal 19