1. Standard : IEC 62271-200 / 1kV ~ 52kV Metal enclosed Switchgear
2. Loss of Service Continuity (LSC)
- the possibility to keep other high-voltage compartments and/or functional units energised
when opening an accessible high-voltage compartment,
A, Category LSC1:
- this form is not intended to provide service continuity during opening of any accessible compartment(s)
and may require complete disconnection of the switchgear and controlgear from the system
and making dead before such opening.
- a circuit-breaker functional unit with cable connections in the same compartment
B. Category LSC 2
- These forms are intended to allow maximum continuity of service of the network
during access to the high-voltage compartments inside the switchgear and controlgear.
- Figure 102
A non-withdrawable circuit-breaker functional unit has two accessible high-voltage compartments
(other than the busbar compartment), and a disconnector in the circuit-breaker compartment.
It is not allowed to open the circuit breaker compartment with the busbar live.
However the high-voltage connection may be earthed via the circuit-breaker.
- Figure 103
A circuit-breaker functional unit with cable connections in the same ompartment as the circuit-breaker,
this compartment being accessible with the busbar live
because it can be isolated and earthed by disconnector and earthing switch placed in the busbar compartment.
- LSC 2A (Figure 104) : similar to Figure 102
The disconnector is located in the busbar compartment,
and there is full partitioning between the busbar and circuit-breaker compartments.
Both the circuit-breaker compartment and the connection compartment may be opened safely
with the busbar live after the disconnector is opened and the earthing switch is closed.
Access to the circuit-breaker compartment requires that the cables are dead and earthed.
- LSC 2B (Figure 105) : similar to Figure 104
For non-withdrawable main switching device designs.
second disconnector and earthing switch are provided in the connection compartment;
there is full partitioning between the circuit-breaker compartment and connection compartment.
This allows the circuit breaker compartment to be opened with both the busbars
and connection compartment live.
- LSC 2B (Figure 106)
For withdrawable designs.
If the main switching device of each LSC 2B functional unit is fitted in its own accessible compartment,
maintenance may be performed on this main switching device without de-energizing the corresponding
connection compartment.
3. Partition Class
A. PM
metal-enclosed switchgear and controlgear providing continuous metallic partitions and/or
shutters (if applicable), intended to be earthed, between opened accessible compartments
and high-voltage live parts.
B. PI
metal-enclosed switchgear and controlgear having one or more non-metallic partitions or shutters
between opened accessible compartments and high-voltage live parts.
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