General instructions
Installation
IG-136-EN version 10; 23/06/2016
30
cgm.3 system
Fully SF6 gas insulated medium voltage switchgear up to 40.5 kV in accordance with IEC Standards
4.8 Cable connections
The medium voltage incoming and outgoing feeders are
linked to the transformer or, occasionally, other cubicles
via cables. The joints of these cables to the corresponding
female bushing in the cubicles of the cgm.3 system can
be either using simple connection terminals (plug-in) or
reinforced terminals (screw-in), type IEC or IEEE-386
compliant
[*]
.
The cable compartment contains the connecting cable
bushings for the incoming and outgoing feeders, as well
as for the outgoing feeders to the transformer.
The cable compartment is sized to allow the use of both
insulated and partially insulated terminals
[9]
.
Never touch live connectors, not even screened
connectors. Screening does not constitute a
protection against direct contact.
When the equipment is in service and a reserve
cubicle is left with voltage in the upper busbar
and without the cables in the lower bushings,
insulating plugs must be placed in the bushings
(EUROMOLD type) or close the earthing switch
and lock that position with a padlock.
The terminals recommended for networks with U
r
= 36 kV are detailed below.
Cable
Type
Rated current
[A]
Manufacturer Connector
36 kV
Connector type Section [mm
2
]
Insulation
dry
400
EUROMOLD(*) Screened
M400LR 35-240
630 M400TB 35-240
630 M400TB 18-630
(*) Connectors recommended for the cgm.3 system by Ormazabal.
Apart from the list above, CENELEC terminals are also
valid. For other values, consult Ormazabal.
4.8.1 Horizontal front connection
1. Close the earthing switch.
2. Remove the cover to access the cable compartment.
Figure 4.23 Cable compartment detail
[9]
It is advisable to use fully insulated connectors for voltages of 36 and 40.5 kV, according to HD 629
.
[*]
In accordance with figure 13 of Standard IEEE 386: “600 A Dead-break interface No. 1, 21.1 kV”
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