Medium Voltage technical guide - Schneider Electric

PE57700
DE59017
DE59016
PE57703
Presentation Prefabricated metal-enclosed
switchgear
AMTED300014EN.indd
Example 1:
Here is a GIS solution with in (D) what is said to be “Base section
with cable connection area” (AREVA WI). There is no connection
compartment, and the only HV compartments are gas filled.
Then, there is no accessible compartment to be considered for LSC
classification.
LSC is not relevant in that case, and service continuity during normal
operation and maintenance is expected to be total.
Example 2:
Here is a GIS solution (Schneider Electric CGset) with an air insulated
connection (and possibly VT) compartment.
This compartment is accessible (with tools).
The other HV compartments are not accessible.
Access to the connection compartment is possible with the busbar(s) live,
meaning all other functional units can be kept operating.
The LSC classification applies, and such solution is LSC2.
Example 3:
Here is a GIS solution (Schneider Electric GMset) with an air insulated
connection (and possibly VT) compartment. This compartment is
accessible and interlocked with the earthing function.
The circuit breaker can be extracted (tool access compartment), even if
that is not considered as normal operation nor normal maintenance.
Access to one functional unit within a switchboard does not require any
other functional unit to be switched off. Such solution is LSC2A.
Example 4:
A mixed technology (Schneider Electric GenieEvo) with an air insulated
connection compartment, and an air insulated main switching device
which can be extracted with the busbar live, thanks to the disconnector.
Single line diagram is similar to example 2.
If both the connection compartment and the circuit breaker compartment
are accessible, and access to any of them means the cables are first
switched off and earthed. Category is LSC2A.
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