Velatia Ormazabal cgm.3 User manual

cgm.3 ENA type
Operation instructions
IG-235-EN, version 02; 17/06/2021
Medium voltage SF6 gas-insulated
switchgears up to 36 kV

CAUTION!
When medium-voltage equipment is operating, certain components are live, other parts may be in movement, and some may reach high
temperatures. Therefore, the use of this equipment poses electrical, mechanical and thermal risks.
In order to ensure an acceptable level of protection for people and property, and in compliance with applicable environmental
recommendations, Ormazabal designs and manufactures its products according to the principle of integrated safety, based on the
following criteria:
· Elimination of hazards wherever possible.
· Where elimination of hazards is neither technically nor economically feasible, appropriate protection functions are
incorporated in the equipment.
· Communication about remaining risks to facilitate the design of operating procedures which prevent such risks, training
for the personnel in charge of the equipment, and the use of suitable personal protection equipment.
· Use of recyclable materials and establishment of procedures for the disposal of equipment and components so that once
the end of their service lives is reached, they are duly processed in accordance, as far as possible, with the
environmental restrictions established by the competent authorities.
Consequently, the equipment to which the present manual refers complies with the requirements of section 11.2 of the
IEC standard 62271-1. It must therefore only be operated by appropriately qualified and supervised personnel, in accordance with the
requirements of standard EN 50110-1 on the safety of electrical installations and standard EN 50110-2 on activities in or near electrical
installations. Personnel must be fully familiar with the instructions and warnings contained in this manual and in other recommendations
of a more general nature which are applicable to the situation according to current legislation.
The above must be carefully observed, as the correct and safe operation of this equipment depends not only on its design but also on
general circumstances which are in general beyond the control and responsibility of the manufacturer. More specifically:
· The equipment must be handled and transported appropriately from the factory to the place of installation.
· All intermediate storage should occur in conditions which do not alter or damage the characteristics of the equipment or
its essential components.
· Service conditions must be compatible with the equipment rating.
· The equipment must be operated strictly in accordance with the instructions given in the manual, and the applicable
operating and safety principles must be clearly understood.
·Maintenance should be performed properly, taking into account the actual service and environmental conditions in the
place of installation.
The manufacturer declines all liability for any significant indirect damages resulting from violation of the guarantee, under any
jurisdiction, including loss of income, stoppages and costs resulting from repair or replacement of parts.
Guarantee
The manufacturer guarantees this product against any defect in materials and operation during the contractual period. In the event that
defects are detected, the manufacturer may opt either to repair or replace the equipment. Improper handling of this equipment and its
repair by the user shall constitute a violation of the guarantee.
Registered Trademarks and Copyrights
All registered trademarks cited in this document are the property of their respective owners. The intellectual property of this manual
belongs to the manufacturer.
In view of the constant evolution in standards and design, the characteristics of the elements contained in this manual are subject to
change without prior notification.
These characteristics, as well as the availability of components, are subject to confirmation by Ormazabal.

3
ÍndexOperation instructions
cgm.3 ENA type
IG-235-EN version 02
ÍNDEX
1 Description and main characteristics 4
1.1 Switchgear elements . . . . . . . . . . . . . . . . . . . . 4
1.1.1 Voltage presence indicator . . . . . . . . . . . . . . . 7
1.1.2 Name plate . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.2 Mechanical characteristics . . . . . . . . . . . . . . . 8
2 Recommended sequence of operations 10
2.1 Checking voltage presence and
phase balance . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.1 ekor.spc phase comparator . . . . . . . . . . . . . . 10
2.2 Mechanism operating handles . . . . . . . . . . . 11
2.2.1 Switch - disconnector driving
mechanism handle (B) . . . . . . . . . . . . . . . . . 11
2.2.2 Spring charging handle for circuit
breaker driving mechanisms . . . . . . . . . . . . . 11
2.3 cgm.3-l switchgear . . . . . . . . . . . . . . . . . . . . 12
2.3.1 Opening operation from
the earthing position . . . . . . . . . . . . . . . . . . . 12
2.3.2 Switch closing operation from
the open position . . . . . . . . . . . . . . . . . . . . . . 12
2.3.3 Opening operation from the switch -
disconnector closed position . . . . . . . . . . . . . 12
2.3.4 Earthing operation from the open position . . 12
2.3.5 Cable test . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.4 cgm.3-p switchgear . . . . . . . . . . . . . . . . . . . . 13
2.4.1 Opening operation from
the earthing position . . . . . . . . . . . . . . . . . . . 13
2.4.2 Switch - disconnector closing operation
from the open position (using the BR-A
driving mechanism) . . . . . . . . . . . . . . . . . . . . 13
2.4.3 Opening operation from the switch -
disconnector closed position . . . . . . . . . . . . . 13
2.4.4 Earthing operation from the open position . . 13
2.4.5 Selection of recommended fuses . . . . . . . . . 14
2.4.6 Fuse replacement sequence . . . . . . . . . . . . . 15
2.5 cgm.3-rb switchgear with earthing . . . . . . . . . 17
2.5.1 Opening operation from
the earthing position . . . . . . . . . . . . . . . . . . . 17
2.5.2 Earthing operation from
the open position . . . . . . . . . . . . . . . . . . . . . . 17
2.6 cgm.3-v switchgear with driving mechanism
A(M)V-EF and RA(M)V-EF (3G) . . . . . . . . . . 17
2.6.1 Opening operation from
the earthing position . . . . . . . . . . . . . . . . . . . 17
2.6.2 Closing operation from the open position . . . 18
2.6.3 Opening operation from
the closed position . . . . . . . . . . . . . . . . . . . . 19
2.6.4 Earthing operation from the open position . . 20
2.7 cgm.3-v switchgear with driving
mechanism A(M)V and RA(M)V (3G) . . . . . . 21
2.7.1 Opening operation from
the earthing position . . . . . . . . . . . . . . . . . . . 21
2.7.2 Closing operation from the open position . . . 22
2.7.3 Opening operation from
the closed position . . . . . . . . . . . . . . . . . . . . 23
2.7.4 Earthing operation from the open position . . 24
3 Safety locking facilities and
interlocking 26
3.1 Mechanical interlocking . . . . . . . . . . . . . . . . . 26
3.2 Safety locking facilities . . . . . . . . . . . . . . . . .26
3.2.1 Locking with a padlock . . . . . . . . . . . . . . . . .26
3.2.2 Locking with a key lock (optional) . . . . . . . . . 26
4 Maintenance 27
4.1 Voltage presence indicator test . . . . . . . . . . . 27
4.2 Specific maintenance for the
cgm.3-v switchgear . . . . . . . . . . . . . . . . . . . .27
5 Additional information 28
5.1 Current transformers arrangements . . . . . . . 28
5.2 Spares and accessories . . . . . . . . . . . . . . . . 28
5.3 Environmental information . . . . . . . . . . . . . . . 29
The instructions for the transport, storage and
installation of the cgm.3 ENA type switchgears are
included in the Ormazabal's MO-091 document.

4 Description and main characteristics Operation instructions
cgm.3 ENA type
IG-235-EN version 02
1 Description and main characteristics
cgm.3 ENA type range is made up of a range of fully gas
insulated modular switchgears, which allow the
configuration of different medium voltage (MV) secondary
electrical distribution diagrams up to 36 kV.
This switchgear range has been designed to meet the
requirements of the following standards:
1.1 Switchgear elements
Each switchgear is made up of a series of independent
compartments:
Fig. 1.1: Main components of modular cgm.3ENA type
switchgears
Gas tank: sealed compartment which houses the busbar
and the switching and breaking elements, where the
insulating medium is gas.
The gas tank has a membrane to allow gases to escape in
the event of an internal arc.
Fig. 1.2: Gas tank
Units
cgm.3-l Switch - disconnector switchgear
cgm.3-p Fuse protection switchgear
cgm.3-v Circuit breaker switchgear
cgm.3-rb Busbar rise switchgear
Standard Description
IEC 62271-1
Common specifications for high-
voltage switchgear and controlgear
standards.
IEC 62271-200
Alternating current metal-enclosed
switchgear and controlgear for rated
voltages above 1 kV and up to and
including 52 kV.
IEC 62271-102 Alternating current disconnectors and
earthing switches.
IEC 62271-103
High voltage switches for rated
voltages above 1 kV up to and
including 52 kV.
IEC 62271-105 Alternating current switch-fuse
combinations.
IEC 62271-100 High voltage alternating current
circuit breakers.
IEC 60529 Degrees of protection provided by
enclosures.
IEC 62271-206 /
IEC 61243-5 Voltage presence indicating systems.
ENATS 41-36
Distribution switchgear for service up
to 36 kV (cable and overhead
conductor connected).
1Gas tank
2Driving mechanism compartment
3Base:
3a Cable compartment
3b Gas relief compartment

5
Description and main characteristicsOperation instructions
cgm.3 ENA type
IG-235-EN version 02
Each gas tank has a manometer for checking the gas
pressure, which can easily be seen from outside the
switchgear. The manometer scale is divided into different
colours: red, grey (shows low gas pressure for other
temperature bands than 20 ºC) and green. For safe
operation, the manometer needle must be in the green
zone of the corresponding temperature band.
Fig. 1.3: Manometer
Includes a padlockable coupling device which allows the
driving mechanism to be replaced regardless of the
position of the switch-disconnector: closed, open or
earthed.
Fig. 1.4: Device for coupling the switch
Switch-disconnector and earthing switch: This has
three positions: closed, opened or earthed.
This switch is operated using driving mechanisms with two
different manual actuation shafts: one for the switch
(switching between the Closed and Open Positions); and
the other for the earthing switch (which switches between
the Open and Earthing positions) on the feeder cables, and
in the case of fuse protection switchgears, on the 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 switchgear's circuit
breaker uses vacuum switching technology.
The circuit breaker is manually actuated by means of the
push-button on the front of the switchgear. For manual
operation, springs must be charged with the corresponding
mechanism operation handle.
The cgm.3-v circuit breaker switchgear comes standard
equipped with a switch-disconnector and an earthing
switch for ensuring the isolating distance.
This element is operated using a specific handle.
1) Driving mechanism compartment: This is the
compartment in which the switch-disconnector or
the circuit breaker is actuated, depending on the
type of switchgear. The mimic diagram for the
Medium Voltage main 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
switchgears:
cgm.3-l
Fig. 1.5: Mimic diagram of cgm.3-l type switchgear
AEarthing switch actuation shaft
BSwitch-disconnector actuation shaft (B and BM driving
mechanisms)
CSwitch and earthing switch position indicator
DActuation shaft access lever
Fekor.vpis voltage indicator

6 Description and main characteristics Operation instructions
cgm.3 ENA type
IG-235-EN version 02
cgm.3-p
Fig. 1.6: Mimic diagram of cgm.3-p type switchgear
cgm.3-v
Fig. 1.7: Mimic diagram of cgm.3-v A(M)V/RA(M)V (3G)
type switchgear
cgm.3-rb
Fig. 1.8: Mimic diagram of cgm.3-rb type switchgear with
earthing
AEarthing switch actuation shaft
BSimultaneous switch - closing and spring
charging actuation shaft (BR-A driving mechanism)
CSwitch and earthing switch position indicator
DActuation shaft access lever
Fekor.vpis voltage indicator
GSwitch opening button (BR-A driving mechanism)
HFuse status indicator
NSpring loading indicator
AEarthing switch actuation shaft
BSwitch-disconnector actuation shaft (B and BM driving
mechanisms)
CSwitch and earthing switch position indicator
DActuation shaft access lever
Fekor.vpis voltage indicator
IOperation counter
JSpring charging shaft
KCircuit breaker opening
LCircuit breaker closing
MCircuit breaker position indicator
NSpring loading indicator
AEarthing switch actuation shaft
CEarthing switch position indicator
DActuation shaft access lever
Fekor.vpis voltage indicator

7
Description and main characteristicsOperation instructions
cgm.3 ENA type
IG-235-EN version 02
Fig. 1.9: Mimic diagram of cgm.3-rb type switchgear
without earthing
2) Base: Made up of the cable compartment (3a) and
the gas relief compartment (3b), see Fig. 1.1: Main
components of modular cgm.3 ENA type
switchgears. The first is located in the lower front
part of the switchgear and has a cover interlocked
with the unit's earth connection, which allows front
access to the medium voltage cables.
The gas relief compartment is located in the lower rear
section of the switchgear. In the event of an internal arc,
the gases produced are deflected downwards and to the
rear.
Alternativelly, the gases could be diverted upwards through
a rear gas relief duct.
Fig. 1.10: Cable compartment
1.1.1 Voltage presence indicator
Ormazabal offers two options for the voltage presence
indicator:
►ekor.vpis unit for indicating the presence of voltage
has been designed in accordance with the
IEC 62271-206 standard. Therefore, the “presence
of voltage” indication appears when the phase-earth
voltage is greater or equal to 45% of the rated
voltage and does not appear when the phase-earth
voltage is less than 10% of the rated voltage.
This unit provide a clear visual indication to the user, and
do not require an auxiliary power supply to operate.
For each of the three phases, the presence of voltage is
indicated by intermittent flashing of the indicators.
The voltage detection unit has the following indicators:
Fig. 1.11: Unit to indicate the presence of voltage
The purpose of the test points for the three phases and
earth is to make it easier to check the phase balance
between switchgears. Ormazabal's specific phase
comparator ekor.spc can be used to do this.
Fekor.vpis voltage indicator
1L1, L2 L3
Display each of the indicator phases
The numbering corresponds to the order of the phases,
from left to right, seen from the front of the switchgear.
Each phase has a test point for checking the phase
balance between switchgears.
2Voltage presence indicator
A flashing light indicates the presence of voltage in that
phase.
3Phase test points
Each phase has a test point for checking the phase
balance between switchgears.
4Earth test point
This is only used for comparing the phases.
See section 2.1 Checking voltage presence and
phase balance.
CAUTION
Alternative methods should be used to check for the
absence of voltage.

8 Description and main characteristics Operation instructions
cgm.3 ENA type
IG-235-EN version 02
1.1.2 Name plate
Every switchgear includes a name plate, with some of the
following values:
Fig. 1.12: Name plate in cgm.3-l switchgear
(*) In the event of a problem or non-conformity, please
give this number to Ormazabal.
1.2 Mechanical characteristics
The dimensions and weights of the cgm.3 switchgear
system are represented in the following table.
Fig. 1.13: cgm.3dimensions
Name plate
No. Switchgear serial number(*)
Type Ormazabal switchgear system
Identifier Switchgear model
Standard Regulations applied to the equipment
Denom. Equipment name
UrEquipment rated voltage (kV)
UpLightning impulse withstand voltage (kV)
UdPower frequency withstand voltage (kV)
frEquipment rated frequency (Hz)
IrEquipment rated current (A)
Manual of
instructions
Manual of General Instructions (IG)
corresponding to the system
Class Driving mechanism class according to
IEC 62272-103
NNumber of mainly active load breaking
operations
Ik / IpShort-time withstand current/Short-time
withstand peak value
tkShort-time withstand current time
Pre Gas pressure inside the gas tank (MPa)
Pme Minimum operating gas pressure (MPa)
SF6Weight of insulating fluid (g)
Year Year of manufacture
TC Thermal class
IAC Internal Arc Classification

9
Description and main characteristicsOperation instructions
cgm.3 ENA type
IG-235-EN version 02
Module Width (A)
[mm]
Depth (F)
[mm]
Height[6] (H)
[mm]
Height
bushing (G)
[mm]
Weight[4]
[kg]
l
Internal arc up to
16 kA - 1 s [2] 418 850 [1] 1745 1042
142
Internal arc [5] up to
21 kA - 1 s [3] 162
p
Internal arc up to
16 kA - 1 s [2] 480 1010 1745 525
220
Internal arc [5] up to
21 kA - 1 s [3] 230
v
Internal arc up to
16 kA - 1 s [2] 600 850 1745 695
250
Internal arc [5] up to
21 kA - 1 s [3] 255
rb
rb with earthing
Internal arc up to
16 kA - 1 s [2] 418 850 [1] 1745 1042
138
Internal arc up to
21 kA - 1 s [3] 158
[1] Switchgear with double cable: 930 mm.
[2] 16 kA - 1 s in gas tank and 5 kA - 1 s in cable compartment.
[3] 21 kA - 1 s AFL/AFLR upwards exhaust with rear channel.
[4] Weights with rear gas relief duct:
* l+v configuration: 554 kg
* l+l+v configuration: 729 kg
[5] The IAC category means that all the medium voltage switchgear compartments are protected against internal arcs.
[6] Height with rear gas relief duct: 2043 mm

10 Recommended sequence of operations Operation instructions
cgm.3 ENA type
IG-235-EN version 02
2 Recommended sequence of operations
2.1 Checking voltage presence and
phase balance
2.1.1 ekor.spc phase comparator
Ormazabal offer the ekor.spc unit for this purpose.
Firstly, connect the red cables of the ekor.spc unit to the
corresponding phase test points on the voltage indication
units, and the black cable to the earth test point. This
operation should be repeated for all the phases: L1, L2 and
L3
Fig. 2.1: ekor.spc unit
Fig. 2.2: Connecting the ekor.spc unit
Comparison of balanced phases
Fig. 2.3: There is NO indication on the comparator
Comparison of unbalanced phases
Fig. 2.4: YES, there is indication on the comparator
CAUTION
Before carrying out any operation when the
switchgear is energised, we recommend checking
the gas pressure, using the manometer.
In case of low gas pressure, contact to nearest
Ormazabal office.
Checking that the medium voltage cables are
correctly connected to the feeder switchgears must
be done. Comparison devices which comply with
the IEC 62271-206 standard may be used.
See section 1.1.1 Voltage presence indicator of
this operation instructions manual.

11
Recommended sequence of operationsOperation instructions
cgm.3 ENA type
IG-235-EN version 02
2.2 Mechanism operating handles
cgm.3 ENA type system switchgears are operated with
three different types of handle, depending on the type of
driving mechanism used.
2.2.1 Switch - disconnector driving mechanism
handle (B)
It is an antireflex handle system with two different handles
for performing operations on the switch - disconnector -
earthing switch located in the switchgears.
Using the “grey” one, it goes from closed position, or vice
versa.
Using the "yellow" one, it goes from open position to
earthing position, or vice versa.
Fig. 2.5: Switch - disconnector driving mechanism handle
This type of handle prevents the opposite operation being
carried out immediately after opening or closing the switch.
2.2.2 Spring charging handle for circuit
breaker driving mechanisms
The spring charging handle is used to manually charge the
springs in the circuit breaker driving mechanism.
Fig. 2.6: Spring charging handle
CAUTION
For safety reasons, maintenance operations
performed directly on the driving mechanism must be
performed WITHOUT any operating handle inserted.
CAUTION
Under improper operation, deformation on arm could
be observed which is as designed to provide strain
relief for the main mechanism.
AGrey: Operation of disconnector
BYellow: Operation of earthing switch
1cgm.3-v spring charging actuation shaft

12 Recommended sequence of operations Operation instructions
cgm.3 ENA type
IG-235-EN version 02
2.3 cgm.3-l switchgear
2.3.1 Opening operation from the earthing
position
1) Move and hold the actuation shaft access lever in
the yellow actuation area to its lower position.
2) Insert the handle in the earthing switch actuation
shaft and turn anticlockwise.
3) Remove the handle. The lever returns to its original
position.
4) Verify that the switchgear is in open position.
Fig. 2.7: Opening operation from earthing position in
cgm.3-l
2.3.2 Switch closing operation from the open
position
1) Move and hold the actuation shaft access lever in
the grey actuation area to its lower position.
2) Insert the handle in the switch-disconnector
actuation shaft and turn clockwise.
3) Remove the handle. The lever returns to its original
position.
4) Verify that the switchgear is in closed position.
Fig. 2.8: Closing operation from open position in cgm.3-l
2.3.3 Opening operation from the switch -
disconnector closed position
1) Move and hold the actuation shaft access lever in
the grey actuation area to its lower position.
2) Insert the handle in the switch-disconnector
actuation shaft and turn anticlockwise.
3) Remove the handle. The lever returns to its original
position.
4) Verify that the switchgear is in open position.
Fig. 2.9: Opening operation from switch closed position
in cgm.3-l
2.3.4 Earthing operation from the open
position
1) Move and hold the actuation shaft access lever in
the yellow actuation area to its lower position.
2) Insert the handle in the earthing switch actuation
shaft and turn clockwise.
3) Remove the handle. The lever returns to its original
position.
4) Verify that the switchgear is in earthing position.
Fig. 2.10: Earthing from open position cgm.3-l

13
Recommended sequence of operationsOperation instructions
cgm.3 ENA type
IG-235-EN version 02
2.3.5 Cable test
To test the cables in cgm.3-l feeder switchgears, B/BM
driving mechanisms with this feature must be ordered.
These driving mechanisms allow the operation of going
from earthing switch closed to switch-disconnector open,
even when the cable compartment cover is open. Thus, the
switch-disconnector cannot be changed to the closed
position until this cover has been put back.
2.4 cgm.3-p switchgear
2.4.1 Opening operation from the earthing
position
1) Move and hold the actuation shaft access lever in
the yellow actuation area to its lower position.
2) Insert the handle in the earthing switch actuation
shaft and turn anticlockwise.
3) Remove the handle. The lever returns to its original
position.
4) Verify that the switchgear is in open position.
Fig. 2.11: Opening operation from earthing position in
cgm.3-p
2.4.2 Switch - disconnector closing operation
from the open position (using the BR-A
driving mechanism)
1) Move and hold the actuation shaft access lever in
the grey actuation area to its lower position.
2) Insert the handle in the switch-disconnector
actuation shaft and turn clockwise. In the same turn,
the switch-disconnector is closed and the retaining
springs are charged.
3) Remove the handle. The lever returns to its original
position.
4) Verify that the switchgear is in closed position.
Fig. 2.12: Closing operation from open position
in cgm.3-p
2.4.3 Opening operation from the switch -
disconnector closed position
1) The switch can be opened manually, using the
push-button on the front of the switchgear, an
opening coil release, or due to action by the fuses.
2) Verify that the switchgear is in open position.
Fig. 2.13: Opening operation from switch closed position
in cgm.3-p
2.4.4 Earthing operation from the open
position
1) Move and hold the actuation shaft access lever in
the yellow actuation area to its lower position.
2) Insert the handle in the earthing switch actuation
shaft and turn clockwise.
3) Remove the handle. The lever returns to its original
position.
4) Verify that the switchgear is in earthing position.

14 Recommended sequence of operations Operation instructions
cgm.3 ENA type
IG-235-EN version 02
Fig. 2.14: Earthing operation from open position
in cgm.3-p
2.4.5 Selection of recommended fuses
The fuses recommended for use in the fuse protection
functional unit are defined according to tests carried out by
the manufacturers. The following table shows the
recommended fuse ratings according to the Ur/Ptransf. ratio:
Remarks:
►General operating conditions: Without overload,
and temperature < 40 °C.
►The values marked with an (*) correspond to SSK-
type fuses.
►Maximum permitted power loss for a fuse: < 75 W.
►Recommended fuses: SIBA 20/36 kV, type HH,
medium type striker, for functional units up to 36 kV
and SIBA HHD TB 36 kV, medium type striker, for
functional units up to 36 kV (conforming to
IEC 60282-1).
►For other brands of fuses and for protection with
overload, consult Ormazabal.
►Temperature-rise testing of the fuse switch
assembly, according to IEC 62271-105.
Transfer current according to IEC 62271-105:
The transfer current has been tested according to the
following parameters:
Ur [kV] Transformer rated power [kVA]
Rated fuse current (A) IEC 60282-1
Line switch-
gear 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000
25 36 6,3 10 16 16 16 20 20 31.5 31.5 40 40 50 63 80*
30 36 6,3 6,3 10 16 16 16 20 20 31.5 31.5 40 40 63 63
Ur Fuse
[kV]
Ur switchgear
[kV]
Ir Fuse
[A]
Itransfer
[A]
36 36 SSK type
80 820

15
Recommended sequence of operationsOperation instructions
cgm.3 ENA type
IG-235-EN version 02
2.4.6 Fuse replacement sequence
If any of the three fuses blows, the switch-disconnector (A)
will open automatically; this is indicated by the red fuse
status indicator (B) located on the front of the driving
mechanism compartment.
Fig. 2.15: Fuse tripping indication in cgm.3-p
In order to replace the fuses, the following procedures
must be followed:
1) Close the earthing switch (C).
2) Remove the cable and fuse compartment access
cover by pulling the handle (D) up.
Fig. 2.16: Opening the cable compartment cover
3) Pull up the handle on the fuse holder cover until the
locking clip is unhooked and then pull sharply
outwards to open the fuse holder.
Fig. 2.17: Opening the fuse holder
4) Remove the fuse holder carriage by pulling it
outward.
Fig. 2.18: Removing the fuse holder carriage
As an option, an auxiliary blown fuse indication for
any of the three fuses is also available.
More precisely, it consists of a normally open
contact plus a normally closed contact
(1NO + 1NC) for auxiliary circuits such as an
illuminated indication showing that any
of the fuses has blown.

16 Recommended sequence of operations Operation instructions
cgm.3 ENA type
IG-235-EN version 02
5) Replace the blown fuse, taking special care with the
striker as shown in the figure.
Fig. 2.19: Changing the medium voltage fuse
6) Insert the fuse holder carriage in its compartment by
pulling it inward.
Fig. 2.20: Inserting the fuse holder carriage
7) Reset the fuse striker by pressing downward with
the thumb.
Fig. 2.21: Resetting the striker in the fuse holder cover
8) Close the cover and check that all the strikers have
been reset.
Fig. 2.22: Closing the fuse holder
9) Place the fuse and cable compartment access
cover (A) by pushing it downward and ensuring it is
interlocked on the cgm.3-p switchgear, taking into
account that the fuse status indicator (B) is green.
1Fuse striker
CAUTION
Make sure that the end of the new fuse with the fuse
striker faces the carriage insulator end. It is advisable
to change all three fuses, even if only one of them
appears to be damaged.
CAUTION
Before inserting the fuse holder carriage in the fuse-
protection switchgear, ensure that both the carriage
as well as the inside of the fuse holder are properly
cleaned.

17
Recommended sequence of operationsOperation instructions
cgm.3 ENA type
IG-235-EN version 02
Fig. 2.23: Closing the cable compartment cover in
cgm.3-p
10) Commission the switchgear, following the
instructions in section 2.4 cgm.3-p switchgear of
this document, which correspond to the opening
operation in the cgm.3-p switchgear.
2.5 cgm.3-rb switchgear with earthing
2.5.1 Opening operation from the earthing
position
1) Move and hold the actuation shaft access lever in
the yellow actuation area to its lower position.
2) Insert the handle in the earthing switch actuation
shaft and turn anticlockwise.
3) Remove the handle. The lever returns to its original
position.
4) Verify that the switchgear is in open position.
Fig. 2.24: Opening operation from earthing position in
cgm.3-rb with earthing
2.5.2 Earthing operation from the open
position
1) Move and hold the actuation shaft access lever in
the yellow actuation area to its lower position.
2) Insert the handle in the earthing switch actuation
shaft and turn clockwise.
3) Remove the handle. The lever returns to its original
position.
4) Verify that the switchgear is in earthing position.
Fig. 2.25: Earthing from open position in cgm.3-rb with
earthing
2.6 cgm.3-v switchgear with driving
mechanism A(M)V-EF and
RA(M)V-EF (3G)
2.6.1 Opening operation from the earthing
position
Initial conditions: Earthing switch closed, circuit breaker
closed and springs charged.
1) Open the circuit breaker by pressing the “0” opening
button on the front push-button and check the
status indicator.
2) Check that no voltage is present using the
ekor.vpis unit.
3) Move and hold the access lever in the yellow
actuation area to its lower position.
4) Insert the handle in the earthing switch actuation
shaft and turn anticlockwise.
5) Remove the handle. The lever returns to its original
position.

18 Recommended sequence of operations Operation instructions
cgm.3 ENA type
IG-235-EN version 02
Fig. 2.26: Opening from earth for AV-EF and RAV-EF (3G)
mechanisms
2.6.2 Closing operation from the open position
Initial conditions: Earthing switch open, circuit breaker
open.
1) Move and hold the access lever in the grey
actuation area to its lower position.
2) Insert the handle in the switch-disconnector
actuation shaft and turn clockwise.
3) Remove the handle. The lever returns to its original
position.
4) Close the circuit breaker by pressing button "I", and
check the status indicator.
Manual Driving Mechanism AV-EF/RAV-EF (3G):
Charge springs, operating the charge handle (see section
2.2.2 Spring charging handle for circuit breaker driving
mechanisms), until the spring loading indicator reads
"CHARGED". Once the spring has been charged, close the
switch by pressing the close button; then check the status
indicator and whether voltage is present in the ekor.vpis
unit.
Motorised Driving Mechanism AMV-EF/RAMV-EF (3G):
Close the switch by pressing the closing button; then check
the status indicator and whether voltage is present in the
ekor.vpis unit.

19
Recommended sequence of operationsOperation instructions
cgm.3 ENA type
IG-235-EN version 02
Fig. 2.27: Connection from Open Position for AV-EF and
RAV-EF (3G) mechanisms
2.6.3 Opening operation from the closed
position
Initial conditions: Circuit breaker closed, earthing switch
open and springs charged.
1) Open the circuit breaker by pressing the “0” opening
button on the front push-button and check the
status indicator.
2) Check that no voltage is present using the
ekor.vpis unit.
3) Move and hold the access lever in the grey
actuation area to its lower position.
4) Insert the handle in the switch-disconnector
actuation shaft and turn anticlockwise.
5) Remove the handle. The lever returns to its original
position.

20 Recommended sequence of operations Operation instructions
cgm.3 ENA type
IG-235-EN version 02
Fig. 2.28: Disconnection from closed position for AV-EF
and RAV-EF (3G) mechanisms
2.6.4 Earthing operation from the open
position
Initial conditions: Circuit breaker open and earthing
switch open with springs charged.
1) Move the access lever in the yellow actuation area
to its lower position.
2) Insert the handle in the earthing switch actuation
shaft and turn clockwise.
3) Remove the handle. The lever returns to its original
position.
4) Close the circuit breaker by pressing the “I” close
button and check the status indicator.