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As global leader of transmission and distribution equipment, we realize reliable and resilient power grids around the world.

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Mobile Substations

Hyosung Heavy Industries provides various products as mobile solutions.

As a total solution provider that manufactures major substations, we offer an array of mobile solutions, such as mobile transformers, GIS, e-houses, ESS, and STATCOM. After completing design, production, and assembly in the factory, the product is delivered to the customer for testing and easy plug-and-play.

Available options range from models for emergency substation recovery to complete substation replacements.

Features and Benefits

We offer specialized solutions based on superior technology.

  • Short Term Emergency Type

    • Used for emergency recovery in case of an accident.
    • Mounted on vehicles.
    • Designed with a focus on mobility to comply with general road regulations.
  • Intermediate Type

    • Provided in the form of vehicles or e-houses for temporary energy supply.
    • Serves as a bypass during substation expansion, maintenance, and repair, provides a short-term grid connection for PV ESS, and can be relocated when resources such as oil and gas are depleted due to mining.
  • Semi-stationary Type

    • A complete replacement of substations.
    • Supplied in the form of an e-house.
    • Suitable for locations where security and environment make performance challenging.


Discover custom solutions that meet your needs.

  • 01

    Emergency Recovery

    • When a blackout occurs due to the failure of a major facility, the mobile substation is swiftly relocated at the time the customer desires to restore the failed substation and improve system stability.
  • 02

    Renewable energy generation
    grid connection

    • In many instances, even if new and renewable energy power generators are constructed, they cannot be directly connected to the grids. As a solution, a mobile substation connects power generators to the grid even before the completion of substation construction.
  • 03

    Strengthening power grid resilience

    • Power systems are being reconstructed by connecting renewable energy power grids; if the grids become unstable as a result, mobile STATCOM can increase the systems' stability. The advantage of mobile STATCOM is that it can be reused for other power grids as power grid conditions change.
  • 04

    Mine and oilfield substations

    • Because the operating period of mines and oilfields is relatively short, the effect of facility investment can be maximized by moving to a new location using a mobile substation. In addition, it can avoid exposure to harsh environments by connecting the transformer and the circuit breaker (GIS) with a GIB or cable.

Product Classification and Specifications

Discover custom solutions that meet your needs.

Mobile Substations

Classification(Unit) HMS-145 HMS-245 HMS-420
Rated voltage(kV) 145 245 420
Max # of bays per trailer 6 Bay 4 Bay (3 Φ Common)
2 Bay (1 Φ Separate)
1 Bay
Max capacity of transformer (MVA)

Large capacity available upon request

67 40 3 X 100
High-voltage switchboard Up to 36kV 40kA, 40,00A


Classification(Unit) HMS-S30 HMS-S60-1 HMS-S60-2
Capacity(Mvar) Up to +/-30 Up to +/-60 Up to +/-60
Nominal voltage (kV) 8 16.7 12
BIL(kV) 95 145 145
Rated current (A) 1,500 1,500 2,000

Mobile ESS

Classification(Unit) BSU-M-PCS BSU-M-H
Capacity(kWh) 2,332.8 4,422.6
Continuous C-rate(C) ≤ 1 ≤ 1
Max DC voltage (V) 1,095.6 1,186.9
Min DC voltage (V) 844.8 915.2
Classification BSU-M-PCS BSU-M-H
Type Modular, Indoor Type Modular, Outdoor + SKID Type
Capacity 2.5MW M1 PCS 3.8MW M2 PCS


Our track records speak for ourselves.

  • Republic of Korea

    154kV Mobile Transformers (154/23/6.6kV, 3ph 30MVA) for Korea Electric Power Corporation in Gangwon-do

    • Korea Electric Power Corporation
    • Gangwon-do
  • Republic of Korea

    154kV Mobile Transformers (154/23/6.6kV, 3ph 30MVA) for Korea Electric Power Corporation in Jeollabuk-do

    • Korea Electric Power Corporation
    • Jeollabuk-do
  • United States

    Pinto Substation 38kV, 40kA, 2500A CGIS E-House

    • Rochester Gas & Electric
    • New York, US
  • United States

    North Alexandria 38kV, 40kA, 2,500A CGIS E-House

    • Dominion Energy
    • Virginia, US
  • United States

    Bremo-Cartersville rebuild project 230/115kV, 1ph 52MVA

    • Dominion Energy
    • Virginia, US
  • Philippines

    SM200 Coal-fired Power Plant, MV Switchboard, Generator E-House

    • CONAL Holdings Corporation


We adhere to global standards and maintain an environment of the highest quality.

View all certifications
  • IEC


  • ANSI


  • IEEE


  • NEMA


  • ISO9001


  • ISO14001


  • ISO45001