Overhead Line

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  • Epoxy Fault Interrupter (EFI)

Epoxy Fault Interrupter (EFI)

Epoxy Fault Interrupter (EFI)

Entec's Epoxy Insulated Fault Interrupter is a one-shot circuit breaker used in the overhead line of 25.8kV. It protects the upstream lines by interrupting the fault currents up to 12.5kA and provides sectionalizing functions by isolating the faulted area.

The EFI uses spring charged mechanism, and it uses vacuum interrupters encapsulated in the epoxy bushing to arc quenching.

The bushings are made of HCEP(Hydrophobic Cycloaliphatic Epoxy) that provides excellent insulation performance even under harsh climatic environments and polluted areas. The EFI tank and control cubicle are made of stainless steel, which have strong endurance against hot, humid, dusty, or corrosive environment.

Two types of microprocessor-based controls can be applied for the operation: ETMFC101-N2, which the communication functions are available and ETMFC50, which has sectionalizing functions without communication.

The EFI has been fully type tested by KERI, an accredited laboratory, according to the specification of KEPCO(Korea Electric Power Corp.) of Polymer-insulated fault interrupters for 25.8kV overhead line. It can also fully comply with the international standard IEC 602271-111, ANSI 37.60

HCEP(Hydrophobic Cycloaliphatic Epoxy) Bushings
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  • Advanced outdoor solid dielectric material
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  • Proven performance in heavily polluted area
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  • Environment-friendly, Oil/SF6 gas free
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  • Reliable and enhanced life expectancy
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  • Superior surface arc tracking resistance
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  • UV Protection, resistant to vandalism
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  • Complied with ANSI standard requirements for creepage / leakage distance
Advanced Reliability of Operation
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  • Fully comply with the international standard IEC 602271-111, ANSI 37.60
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  • 10,000 times maintenance-free mechanical operations
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  • Manual / Automatic operations available with digital control
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  • 50 times or 24 hours operation at fully charged battery without AC supply input
One-shot Circuit Breaking
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  • Overcurrent trip (50P, 50G, 51P, 51G : IEC, ANSI/IEEE, 37Non-standard Curves Provision)
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  • Inrush current restraint
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  • Line current and live voltage indication display
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  • Battery over discharge protection
Electrical ratings
Rated maximum voltage [kV] 25.8
Rated current [A] 400
Operation manual, automatic
Frequency [Hz] 50 / 60
Short time withstand current, 1sec [kA] 12.5
Short circuit making current [kA peak] 32.5
Basic impulse withstand voltage [kV crest] 150
Power frequency withstand voltage, dry [kV] 60
Power frequency withstand voltage, wet [kV] 50
Control and operation function RTU built-in or separate digital control
Control Operating voltage 110-220Vac / 24Vdc
Ambient temperature -25 to 70 °C
Power frequency withstand voltage [kV] 2
Basic impulse withstand voltage [kV crest] 6
International standard IEC 602271-111, ANSI C37.60

* Other ratings are available upon request.
* ENTEC reserves the right to change the design and specification without notice

Reference project