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High Voltage Switchgears

Beginning in 1978 with the development of a 170 kV gas circuit breaker, Hyosung Heavy Industries has supplied various models with a up to 800kV to more than 40 countries worldwide.

Hyosung’s high voltage switchgears are compact, easy to maintain, and have been certified by international certification organizations such as KERI, CESI, and KEMA, attesting to the quality and reliability of our products on a global scale.

Features and Benefits

We offer specialized solutions based on superior technology.

  • Compact Size

    • Customers can minimize their substation construction costs due to the product's compact size compared to competitors.
    • Easy to install in dense urban areas or underground.

  • High Safety and Reliability

    • There is no risk of electric shock or fire because the live parts are enclosed in a grounded tank filled with SF6 gas.
    • Completely sealed structure prevents salt damage, dust, contamination, lightning, typhoons, and other environmental effects, and properly separated gas compartments prevent the spread of accidents.

  • User-friendly Products

    • Products are designed considering easy operation and maintenance.
    • Digital solutions can be applied including Hyosung’s low-power instrument transformers (LPITs).

  • Diverse Delivery Performance

    • We are renowned for quality as we supply 300 clients in 40 countries worldwide.

  • Technology Innovation continued over 40 years

    • We continue to realize product innovation by operating a circuit breaker R&D center.

  • Green Technology

    • Hyosung offers eco-friendly solutions minimizing carbon footprint using eco-friendly gas mixtures or vacuum technology.

Product Classification and Specifications

Discover custom solutions that meet your needs.

72.5kV GIS

Rated voltage(kV) 72.5kV
Short-circuit current rating(kA) 20kA
Rated current(A) Up to 2,000A
Rated frequency(Hz) 60Hz
Features
  • Excellent reliability with mechanical durability (class M2) and small capacitive current (class C2).
  • Guaranteed gas leakage rate of less than 0.1%/year.
  • We secure and provide two-phase breaking performance specialized for the Korean railway system market.

145kV GIS

Rated voltage(kV) 145kV
Short-circuit current rating(kA) Up to 40kA
Rated current(A) Up to 3,150A
Rated frequency(Hz) 50/60Hz
Features
  • Smallest size in the industry with a bay width of 800mm
  • Excellent reliability with mechanical durability (class M2) and small capacitive current (class C2).
  • Guaranteed gas leakage rate of less than 0.1%/year.
  • Excellent accessibility for operation and maintenance

170kV GIS

Rated voltage(kV) 170kV
Short-circuit current rating(kA) 40kA/50kA/63kA
Rated current(A) Up to 4,000A
Rated frequency(Hz) 50/60Hz
Features
  • The most reliable model in the industry.
  • Secured with large-capacity breaking performance required in domestic and overseas markets.
  • Excellent reliability with mechanical durability (class M2) and small capacitive current (class C2).
  • Guaranteed gas leakage rate of less than 0.1%/year.

Eco-friendly 170kV GIS

Rated voltage(kV) 170kV
Short-circuit current rating(kA) 50kA
Rated current(A) Up to 3,150A
Rated frequency(Hz) 60Hz
Features
  • Using a mixed gas circuit breaker, we provide eco-friendly solutions that reduce greenhouse gas emissions by more than 99%.
  • Insulation medium: Novec™ 4710 + CO2

245/300kV GIS

Rated voltage(kV) 245/300kV
Short-circuit current rating(kA) 50kA/63kA/80kA
Rated current(A) Up to 4,000A
Rated frequency(Hz) 50/60Hz
Features
  • Smallest size in the industry with a bay width of 1,500mm
  • Secured with large-capacity breaking performance.
  • Excellent reliability with mechanical durability (class M2) and small capacitive current (class C2).
  • Guaranteed gas leakage rate of less than 0.1%/year.
  • Excellent accessibility for operation and maintenance

362kV GIS

Rated voltage(kV) 362kV
Short-circuit current rating(kA) 50kA/63kA
Rated current(A) Up to 8,000A
Rated frequency(Hz) 60Hz
Features
  • Excellent reliability with mechanical durability (class M2) and small capacitive current (class C2).
  • Guaranteed gas leakage rate of less than 0.1%/year.

420kV GIS

Rated voltage(kV) 420kV
Short-circuit current rating(kA) 50kA/63kA/80kA
Rated current(A) Up to 6,300A
Rated frequency(Hz) 50/60Hz
Features
  • Ensures stable quality thanks to condenser-free breaking parts.
  • Secured with large-capacity breaking performance.
  • Excellent reliability with mechanical durability (class M2) and small capacitive current (class C2).
  • Guaranteed gas leakage rate of less than 0.1%/year.

550kV GIS

Rated voltage(kV) 550kV
Short-circuit current rating(kA) Up to 63kA
Rated current(A) Up to 6,300A
Rated frequency(Hz) 50/60Hz
Features
  • Single break circuit breaker
  • Excellent reliability with mechanical durability (class M2) and small capacitive current (class C2).
  • Guaranteed gas leakage rate of less than 0.1%/year.

800kV GIS

Rated voltage(kV) 800kV
Short-circuit current rating(kA) Up to 50kA
Rated current(A) Up to 8,000A
Rated frequency(Hz) 50/60Hz
Features
  • Double break circuit breaker
  • Excellent reliability with mechanical durability (class M2) and small capacitive current (class C2).
  • Guaranteed gas leakage rate of less than 0.1%/year.

References

Our track records speak for ourselves.

  • Republic of Korea

    800kV 50kA 8000A GIS

    • Korea Electric Power Corporation
    • Supplied 800 kV GIS
  • Republic of Korea

    170kV 50kA 4000A GIS

    • Samsung Electronics
    • Primary GIS supplier for Samsung Electronics
  • India

    800kV 50kA 4000A GIS

    • PGCIL
    • PGCIL 800 kV GIS No 1
  • Saudi Arabia

    420kV 63kA 4000A GIS

    • SEC
    • Primary supplier of GIS in the Saudi Arabiam market
    • Direct order supplier of 145kV for National Grids #1 & 2
  • Malaysia

    145kV 40kA 3150A GIS

    • TNB
    • We have delivered GIS to Malaysia since the 1980s
  • Singapore

    420kV 63kA 4000A GIS

    • Singapore Power
    • Primary supplier of GIS in the Singaporean market

Certifications

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

View all certifications
  • IEC

    IEC

  • ANSI

    ANSI

  • IEEE

    IEEE

  • NEMA

    NEMA

  • JIS

    JIS

  • DIN

    DIN

  • GOST

    GOST

  • KS

    KS

  • KOLAS

    KOLAS

  • KEMA

    KEMA

  • CESI

    CESI

  • KERI

    KERI

  • FGH

    FGH

  • IPH

    IPH

  • ISO9001

    ISO9001

  • ISO14001

    ISO14001

  • ISO45001

    ISO45001

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