Ormazabal cgm.3-rc User Manual

IG-183-EN version 06; 31/03/2020
8
Description and main characteristics General instructions
cgm.3 system: medium voltage SF
6
gas-insulated
cubicles up to 38 kV according to IEEE and CSA standards
Switch-disconnector and grounding switch: This has
three positions: closed, open or grounded.
This switch is operated using driving mechanisms with two
dierent shafts: one for the switch (switching between the
closed and open positions); and the other for the grounding
switch (which switches between the open and grounded
positions) on the feeder cables, and in the case of fused
protection cubicles, on the six fuse holder clamps.
These elements are operated independently so that their
actuation speed does not depend on the speed of the
manual operation.
Vacuum circuit-breaker: The cgm.3-v cubicle’s circuit-
breaker uses vacuum switching technology.
The circuit-breaker is actuated by means of the push-
button on the front of the cubicle. For manual operation,
springs must be charged with the corresponding lever.
To ensure that the isolating distance is adequate, the
cgm.3-v cubicle’s circuit-breaker comes standard with a
switch-disconnector and a grounding switch. This element
is operated using a specic lever.
The cgm.3-v circuit-breaker cubicles can be equipped with
an electromechanical safety device called an undervoltage
coil. Its function is to ensure that the cubicle switch opens
in the event of an unexpected drop of more than 30% in the
auxiliary voltage.
2. Driving mechanism compartment: this is the
compartment in which the switch-disconnector,
grounding switch or the circuit-breaker is actuated,
depending on the type of cubicle. The mimic diagram
for the main medium voltage circuit is displayed on the
cover of this compartment.
The mimic diagram includes all the position indicators
for the actuators.
Elements in the driving mechanism area of modular
cubicles:
cgm.3-l
a
ekor.sas, acoustic grounding prevention alarm
b
Manometer window
c
Voltage presence indicator ekor.vpis / ekor.ivds
d
Operation area:
• GREY for switch-disconnector
• YELLOW for grounding switch
e
Status indicators:
• GREEN open
• RED closed
f
Actuation shaft access handle
Figure 1.7. Mimic diagram of cgm.3-l cubicle

Ormazabal cgm.3-rc Specifications

General

Brand	Ormazabal
Model	cgm.3-rc
Category	Power distribution unit
Language	English