IG-247-EN version 02; 08/12/2020
5
General instructions
cms
.21
Description and main characteristics
1.1.1. Medium voltage switchgear
[2]
Schematic based on a
cgmcosmos
-2lv compact functional unit.
cms
.21 can equip
cgmcosmos
and
cgm
.3 systems from
Ormazabal
. The most usual schematics possible are as
follows:
•
cgmcosmos
-5l,
cgmcosmos
-4l+a,
cgmcosmos
-2lp+a,
cgmcosmos
-3lv+a
[2]
,
cgmcosmos
-2v+p+a,
cgmcosmos
-3l+a,
cgmcosmos
-3lp,
cgmcosmos
-2l2p,
cgmcosmos
-4lv,
cgmcosmos
-2l2v.
•
cgm
.3-4l,
cgm
.3-2l2p,
cgm
.3-3lp,
cgm
.3-3lv.
where:
l
Feeder function
p
fuse protection function
v
circuit-breaker function
a
auxiliary services supply function
Ormazabal
recommends using a reduced height medium
voltage system. Using this on the cubicle is recommended
if automation and/or supervision functions are required
in medium voltage. If exterior low voltage power is not
possible, the auxiliary services power function can be
supplied.
Optionally, this function can be fi tted with a disconnector or
an earthing switch with indicating devices which guarantee
safe indication of the disconnection operation and earthing
of the voltage transformer and its high voltage protection,
thus allowing safe replacement on site.
Ormazabal
recommends following the procedure for replacing
voltage transformers in accordance with local regulations,
legislation and specifi cations of the Electricity Company.
For other types of automation or medium-voltage
schematics, please contact
Ormazabal
.
1.1.2. Prefabricated concrete enclosure
The enclosure is supplied with metal doors, opening handle,
and interlockings in doors and lock.
The switchgear access doors are double, allowing an
eff ective access gap of 1670 mm high by 2000 mm wide in
the front. The doors have an interlocking system in opening
at approximately 90º and 180º.
The right hand door can be supplied with diff erent types
of locks (European barrel,
Ormazabal
lock, etc.), as well as
padlocking with eyebolt of up to Ø 10 mm.
[2]
The door closes at two points: up and down. First open the
right-hand leaf, acting on the lock. The two bolts, one in
the top and the other in the bottom, should be slid back to
release the left-hand leaf.
1
For padlock with eyebolt of up to Ø10 mm
2
European barrel
3
Ormazabal
type
Figure 1.2.
Types of locks available
