Modular units

DE53507
DE53508
DE53509
DE53510
Generalities Compartments description
SF6 and vacuum lateral type
circuit breaker
Frontal vacuum type
circuit breaker
61007N
61006N
Busbar compartment
The three insulated busbars are parallel-mounted. Connection is made to the upper
pads of the enclosure using a fi eld distributor with integrated captive screws.
Ratings 400 - 630 - 1250 A.
Switch compartment for 24 kV
This compartment is separated from the busbar compartment and the connection
compartment by the enclosure surrounding the switch, the disconnector and
the earthing switch.
Connection and switch compartment
The network cables are connected:
b to the terminals of the switch
b to the lower fuse holders
b or to the connection pads of the circuit breaker.
Cables may have either:
b cold fi tted cable end for dry-type
With basic equipment, the maximum allowable cross-section for cable is:
b 630 mm 2 or 2 x 400 mm 2 for 1250 A incoming or outgoing units
b 240 mm 2 or 2 x 240 mm 2 for incoming or outgoing units 400 - 630 A
b 95 mm 2 for transformer protection cubicles incorporating fuses.
See in fonctional units characteristics chapter for each unit allowable section.
The earthing switch must be closed before the cubicle may be accessed.
The reduced depth of the cubicle makes for easy connection of all phases.
A stud incorporated in the fi eld distributor makes it possible to position and secure
the cable-end lug with a single hand.
26 AMTED398078EN.indd