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Medium voltage productsUnisec
Modular air-insulated switchgear for all applications in secondary power distribution up to 24 kV
UniSec is an indoor air-insulated switchgear for medium voltage secondary distribution up to 24 kV. It offers a broad portfolio of functional units and technical features and is suitable for a wide range of applications including industry, renewable energy plants, distribution and transformer substations, data centers, small generation systems, buildings and infrastructure, and smart grids.
UniSec also offers a sulfur hexafluoride (SF6) free variant called UniSec Air. The new switchgear includes the load break switch (LBS) and disconnector GSec Air. This new component has a shunt vacuum interrupter for breaking capacity as the insulation medium with a global warming potential (GWP) of zero. The switchgear also contains a vacuum circuit breaker and is fully compliant with IEC standards and the EU F-gas regulation (EU) 2024/573.
UniSec features a modular design and is tested according to the latest IEC 62271-200 standard and GB specifications. The switchgear, with corrosive and pollution-resistant materials, is certified for installation in the most severe conditions like marine, areas with high seismic hazards, and low temperature environments.
- Removable and withdrawable SF6 and vacuum circuit breakers
- Suitable and certified for installation in the most severe conditions like marine, areas with high seismic hazards, and low temperature environments
Interlocks
• Another important issue to bear in mind is how the medium voltage compartments can be accessed during normal operation, for maintenance work or any other reason. IEC 62271-200 defines three methods for controlling the way an accessible compartment is opened:
– The first involves the use of interlocks to ensure that all live parts inside the switchgear are dead and earthed before the compartment is opened
– The second is based on the user’s procedure and on a locking device to ensure safety. In this case, the compartment is equipped with padlocks, keys, locking magnets or some other equivalent device
– The third method does not provide for any integrated devices to ensure electrical safety prior to opening, but tools are required to open the compartments; even commonly used objects, like screwdrivers or pliers, are considered tool
| Application | Acronym | 190 mm | 375 mm | 500 mm | 600 mm | 750 mm |
|---|---|---|---|---|---|---|
| Feeder with load break switch | SDC, Load break switch | * | * | * | ||
| Coupler with load break switch | SDS, Load break switch | * | * | * | ||
| Feeder with double load break switch | SDD, Load break switch | * | ||||
| Coupler with load break switch for measurement | SDM, Load Break Switch | * | ||||
| Universal metering unit | UMP, Universal Metering Panel | * | ||||
| Direct feeder with measurement and busbar earthing | DRC, Direct Riser | * | * | |||
| Riser with measurement | DRS, Direct Riser Sectionalizing | * | * | |||
| Measurement with fused load break switch | SFV, Switch Fused Voltage | * | * | |||
| Feeder with fused load break switch | SFC, Switch Fused Cables | * | * | * | ||
| Coupler with fused load break switch | SFS, Load break switch with fuses | * | * | |||
| Feeder with circuit-breaker and load break switch | SBC, Switch Breaker Cables | * | ||||
| Feeder with circuit-breaker and air disconnector | SBC-AirD, Air disconnector Breaker Cable | * | ||||
| Feeder with withdrawable circuit-breaker and load break switch | SBC-W, Switch Breaker Cables withdrawable | * | * | * | * | |
| Coupler with circuit-breaker and load break switch | SBS, Switch Breaker Sectionalizing | * | * | * | * | |
| Coupler with circuit-breaker and air disconnector | SBS-AirD, Air disconnector Breaker Sectionalizing | * | * | * | * | |
| Coupler with withdrawable circuit-breaker and load break switch | SBS-W, Switch Breaker Sectionalizing withdrawable | * | * | * | * | |
| Coupler with circuit-breaker and double load break switch for measurement | SBM, Switch Breaker Measurement | * | * | * | * | |
| Coupler with withdrawable circuit-breaker and double load break switch for measurement | SBM-W, Switch Breaker Measurement withdrawable | * | * | * | * | |
| Reversed feeder with circuit-breaker and load break switch | SBR, Switch Breaker reversed | * | * | * | ||
| Feeder with integrated circuit-breaker and disconnector | HBC, Hybrid Breaker Cables | * | * | * | ||
| Feeder with contactor and load break switch | SCC, Switch Contactor Cables | * | ||||
| Coupler with integrated circuit-breaker and disconnector | HBS, Hybrid Breaker Sectionalizing | * | ||||
| Left or right lateral cable riser | RLC/RRC, Riser Left/Right Cables | * | ||||
| Feeder with withdrawable frontal circuit-breaker | WBC, Withdrawable Breaker Cables | * | * | |||
| Coupler with withdrawable frontal circuit-breaker | WBS, Withdrawable Breaker Sectionalizing | * | * | |||
| Direct feeder with measurement and busbar earthing | BME, Busbars Measurement Earthing | * |