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  • Solid Insulated Switchgear(SIS)

Solid Insulated Switchgear(SIS)

Solid Insulated Switchgear (SIS)

Entec’s Solid Insulated Switchgear(SIS) is designed for the application in substation and power plants for voltage classes of 15kV, 27kV, and 38kV. The product is available with single busbar(CMIS) and double busbar(CSIS) type. CMIS is available with DS(MH), MOF, main feeder(CH), feeder(FH) and spare feeder(AH). CSIS is available with incoming(IH), PT, feeder(BH), tie(TIE) and sectionalizer(SEC).

The operating mechanism uses a permanent magnetic actuator that guarantees high reliability and maintenance-free operation. It uses vacuum interrupters encapsulated in epoxy bushings for arc quenching, eliminating the need for the insulants such as oil and gas.

Main circuit and busbar are HCEP(Hydrophobic Cycloaliphatic Epoxy) molded that provides excellent insulation performance even under harsh climatic environments and polluted areas.

The SIS is supplied with complete microprocessor-based control(ETR500) including metering, monitoring, recording, and communication functions. Protection relays of other brands are also compatible.

The SIS has been fully type tested by accredited laboratories such as KERI according to the international standard IEC 62271-100,101,102,200 and 201.

HECP (Hydrophobic Cycloaliphatic Epoxy)
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  • Advanced outdoor solid dielectric material
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  • Short-circuit incident free by individual phase molding
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  • Environment-friendly, Oil/SF6 gas free
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  • Reliable and enhanced life expectancy
Advanced Reliability of Operation
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  • 10,000 times of operation guaranteed
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  • Magnetic actuator with simple mechanism increases reliability of operation
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  • Minimized moving components allows maintenance free operation
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  • Reduced installation and operating cost
Installation Environment
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  • 70% reduced installation space compared with Metal Clad Switchgear
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  • Maintenance-free due to solid dielectric application
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  • Convenient Extension allows flexible configuration
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  • Operating temperature: -10°C to 40°C
Other Technical Features
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  • Mechanical interlock between CB, DS and ES to ensure operator safety
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  • Dual protection by Earthing switch and disconnector during maintenance
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  • Automatic Load Transfer Switch allows high speed switching within 1 cycle in case of main source shut down, which drastically minimizes outage period.
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  • Voltage loss and recovery monitoring provided
Electrical ratings
Description 27S [D] 38S 29S
Rated maximum voltage [kV] 25.8 40.5 27.5
Rated current [A] 630 / 1250 / 2000
[600 / 2000]		 2500 2500
Operation manual, automatic
Frequency [Hz] 60 50 50/60
Power frequency
withstand voltage [kV]		 Phase to ground,
pole to pole		 50 [70] 95 95
DS pole to pole 50 [77] 118 110
Basic impulse
withstand voltage [kV]		 Phase to ground,
pole to pole		 125 [150] 200
DS pole to pole 140 [165] 220
Short circuit breaking current [kA] 25, 40 31.5
Short time withstand current [kA] peak: 65, rms: 25, 1sec
[peak: 104, rms: 40, 1sec]		 peak: 82, rms: 31.5, 3sec
Short circuit making current [kA] 65, 104 82
Degree of protection IP31 [IP41] IP 3X
Electrical endurance grade E1 [E2] E1 E2
Mechanical endurance grade M2
Control operating voltage 220Vac / 110 [220]Vdc
Operating temperature -10 to 40 °C -5 to 40 °C -25 to 40 °C
Applied standard IEC 62271-1, 100, 102, 200 IEC 62271-200,
IEC 62505-1, 2
Reference project