Ormazabal velatia cgm.3 system Instruction manual

LIB
cgm.3-huv system
Fully gas-insulated medium-voltage
switchgear:
General instructions
IG-308-EN, version 01, 03/06/2022

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 notice. These characteristics, as well as the availability of components, are subject to confirmation by
Ormazabal.
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 protective 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 Standard
IEC 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[1].
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.
Warranty
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 Ormazabal.
[1] For example, in Spain the “Regulation on technical conditions and guarantees for safety in high-voltage electrical installations” – Royal Decree
337/2014 is obligatory.

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General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
Contents
Contents
1. General description ...................................................4
1.1. cgm.3-huv models ...........................4
1.2. Standards applied............................4
1.3. Main components ...........................5
1.3.1. Gas tank .....................................6
1.3.2. Driving mechanisms compartment ...........6
1.3.3. Base .........................................7
1.3.4. Name plate ..................................8
1.4. Ratings table.................................9
1.5. Dimensions and weights ....................10
1.6. Operating conditions .......................11
2. Handling and transport...........................................12
2.1. Lifting equipment...........................12
3. Storage......................................................................14
4. Installation ...............................................................15
4.1. Unpacking the equipment ..................15
4.2. Positioning accessories during transport.....16
4.3. Minimum installation distances..............17
4.4. Recommended cable connection trenches...17
4.4.1. Cubicles with internal arc classification
IAC up to 25 kA - 1 s .........................18
4.5. Fixing to floor...............................21
4.5.1. Fixing to floor on profile.....................21
4.5.2. Fixing to floor by anchoring .................21
4.6. Connecting the cubicles.....................24
4.7. Earthing the switchgear .....................24
4.8. Cable connection ...........................25
4.8.1. Bottom front connection ....................26
4.8.2. Top front connection........................28
4.9. Assembling and connecting metering
and auxiliary services transformers in
cgm.3-huv ma ..............................30
5. Recommended sequence of operations.................31
5.1. Checking the gas pressure ..................31
5.2. Voltage presence indicating relay............32
5.3. Phase concordance check ...................33
5.4. Feeder function.............................34
5.4.1. Mimic diagram..............................34
5.4.2. Actuating levers ............................34
5.4.3. Opening operation from earthing position...35
5.4.4. Switch closing operation from isolating
position ....................................36
5.4.5. Opening operation from closed position.....37
5.4.6. Earthing operation from isolating position...38
5.4.7. Cable test...................................39
5.5. Circuit-breaker function with AV/RAV
driving mechanism .........................40
5.5.1. Mimic diagram..............................40
5.5.2. Spring charge and actuating levers ..........41
5.5.3. Opening operation from earthing position...41
5.5.4. Closing operation from isolating position ....43
5.5.5. Opening operation from closed position.....45
5.5.6. Earthing operation from isolating position...47
5.6. -huv-lv and huv-rbv functions ...............49
5.6.1. Mimic diagram..............................49
5.6.2. Feeder function in cgm.3-huv-lv cubicle .....49
5.6.3. Circuit-breaker function in cgm.3-huv-lv
and cgm.3-huv-rbv cubicles .................50
5.6.4. Side incoming earthing function
cgm.3-huv-lv ...............................57
5.6.5. Incoming earthing function
cgm.3-huv-rbv..............................61
6. Safety elements........................................................65
6.1. Acoustic earthing prevention alarm .........65
6.2. Interlocks ...................................65
6.2.1. Padlock interlocking ........................66
6.2.2. Keylock interlocking ........................67
7. Maintenance.............................................................68
7.1. Voltage presence indicating relay test .......68
7.2. Acoustic earthing prevention alarm test .....69
7.3. Preventive maintenance of models
cgm.3-huv-v, cgm.3-huv-lv and
cgm.3-huv-rbv..............................70
8. Spares and accessories ............................................71
9. Environmental information ....................................73

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General description General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
1. General description
[2] Further information at www.ormazabal.com.
Ormazabal's cgm.3-huv system, designed following the
requirements set out in the standards of the International
Electrotechnical Commission (IEC), is made up of dierent
unifunctional and multifunctional switchgear models,
with full SF6gas insulation, which can be used to congure
dierent systems in medium voltage up to 40.5 kV.[2]
1.1. cgm.3-huv models
Unifunctional
switchgear Function
-l Feeder
-v Circuit-breaker
-rc Cable rise
-ma Metering and auxiliary services
Table 1.1. Unifunctional switchgear
Multifunctional
switchgear Functions
-lv 1 feeder function and 1 circuit-breaker function
-rbv 1 rise function in busbars and 1 circuit-breaker
function
Table 1.2. Multifunctional switchgear
1.2. Standards applied
Standard Description
IEC 62271-1 Common specications for high voltage switchgear standards.
IEC 62271-100 High-voltage alternating current circuit-breakers.
IEC 62271-102 Alternating current disconnectors and earthing switches.
IEC 62271-103 High-voltage switches for rated voltages above 1 kV and below 52 kV.
IEC 62271-200 Alternating current metal-enclosed switchgear for rated voltages above 1 kV and up to and including 52 kV.
IEC 62271-206/IEC 61243-5 Voltage presence indicating relay.
IEC 60529 IP ratings for enclosures.
Table 1.3. Standards applied

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General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
General description
1.3. Main components
1Gas tank
1.1 Left side connection via bushing or bushlink. Side connection
with female bushing, ask Ormazabal.
2Driving mechanisms area
2.1 Circuit-breaker operation area
2.2
Operations area:
• YELLOW: earthing switch
• GREY: switch-disconnector
2.3 Earthing switch
2.4 ekor.vpis/ekor.ivds live voltage detector
3Base
3.1 Cable compartment access cover
3.2 Medium-voltage cable xing bracket
3.3 Gas relief compartment: Representation with gas relief; there is
also the option of gas output to trench.
3.4 Front cable connection bushings
4Generator incoming cable compartment
4.1 Access cover to generator incoming cable compartment
Figure 1.1. Main elements of cgm.3-huv cubicles

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General description General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
1.3.1. Gas tank
Sealed compartment which houses the busbar and the
switching and breaking elements, where the insulating
material is SF6gas.
Each gas tank has a pressure relief device to facilitate gas
relief in the event of internal arc.
Thanks to the hermetically sealed nature of the gas
tank containing all the medium-voltage elements, the
equipment is expected to have a minimum service life of 30
years, without replenishing the gas according to Standard
IEC 62271-1.
Figure 1.2. Gas tank
1.3.2. Driving mechanisms compartment
This is the compartment in which the switch-disconnector,
earthing switch or circuit-breaker is driven, depending on
the type of function.
The mimic diagram for the main medium-voltage circuit is
displayed on the cover of this compartment.
The mimic diagram includes all the position indicating
relays for the driving elements.
The cgm.3-huv system has, in accordance with the
functional unit, the following types of driving mechanism:
BTilting functional units -l, -rc with earthing via selector
switch and -rb with earthing via selector switch
BM Motorised tilting -l functional units
AV Circuit-breaker without reclosing -v functional units
AMV Motorised circuit-breaker without reclosing -v functional units
RAV Circuit-breaker with reclosing option -v functional units
RAMV Motorised circuit-breaker with reclosing option -v functional units
Table 1.4. Types of driving mechanisms
These elements are operated independently, i.e. their
actuation speed does not depend on the speed of the
manual operation.
The B and BM driving mechanisms can be replaced by
upgrading in any of the three possible positions (closed–
open–earthed). While the driving mechanism is withdrawn,
these positions of the switch can be blocked using a
coupling device, whether in service or not.

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General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
General description
1.3.3. Base
Made up of the cable compartment and the gas relief
compartment:
Cable compartment
This is located in the bottom front section of the cubicle
and has a cover interlocked with the earthing switch, thus
allowing front access to the medium-voltage cables.
As standard, it is designed to contain up to:
• Two shielded screw-in cable connectors (reduced) per
phase or one cable connector (reduced) plus surge
arrester (reduced) with space for the corresponding
incoming power cables.
• Cable ties for the power cables.
• Earthing bars.
As an option:
• Two symmetric cable connectors or symmetric cable
connector plus symmetric surge arrester.
Figure 1.3. Cable compartment
Gas relief compartment
Ormazabal's cgm.3-huv system is designed and
constructed to withstand at least the thermal and dynamic
eects of an arc of 25 kA for 1 second should a defect result
in an internal arc in the gas compartment. The system
conducts the gases generated in a fully controlled manner
to avoid any possible injury to people in the equipment
operation area.
Optionally, a relief duct can be tted in the rear of the
cubicle to redirect the gases to the top. Please check
with Ormazabal.

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General description General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
1.3.4. Name plate
Each unit includes a name plate:
Figure 1.4. Example of name plate
Name plate
N° Cubicle serial number*
Type Ormazabal switchgear system.
Designation Cubicle model
Standard Standards applied to the equipment
Name Equipment name
UrEquipment rated voltage (kV)
UpLightning impulse withstand voltage (kV)
UdPower frequency withstand voltage (kV)
frEquipment rated frequency (Hz)
IrEquipment rated current (A)
Instructions Manual General Instructions Manual (IG) for the system
Class Switch class according to IEC 62271-103 and circuit-breaker class according to IEC 62271-100
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)
SF6Insulating uid mass (kg)
CO2eEquivalent CO2uid mass (t)
Year Year of manufacture
TC Minimum working temperature
IAC Internal arc classication
* In the event of incident, this number should be reported to Ormazabal.
Table 1.5. Name plate

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General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
General description
1.4. Ratings table
Rated voltage [kV] 36 40.5
Frequency [Hz] 50 60 50 60
Rated current [A]
Busbars and cubicle interconnection 630
Feeder 630
Generator incoming 250
Rated short-time withstand current [kA]
With tk= (x) s 20* (1 s) | 25 (1 s) 20* (1 s) | 25 (1 s)
Peak value 50*/62.5 52*/65 50*/62.5 52*/65
Rated short-time withstand current of the generator incoming earthing circuit [kA]
With tk= (x) s 5 (1 s) 5 (1 s)
Peak value 12.5 13 12.5 13
Rated insulation level [kV]
Power frequency rated withstand voltage (1 min) 70/80 95/118
Lightning impulse rated withstand voltage 170/195 185/215
Internal arc classication according to IEC 62271-200
IAC AF/AFL 20*/25 kA (1 s) 20*/25 kA (1 s)
IAC AFLR 20*/25 kA (1 s) 20*/25 kA (1 s)
IP rating: gas tank IP X8
IP rating: external enclosure IP 2XD**
Standard unit colour [RAL] grey 7035/blue 5005
Category of loss of service continuity [LSC] LSC2
Compartmentalisation class PM
* Tests carried out with current 21 kA/52.5 kA.
** Consult Ormazabal for other IP rating.
Table 1.6. Characteristics
The values set out in this table are general for the
cgm.3-huv system and are only valid when conrmed
by Ormazabal. Some cubicle models can withstand
partial values. For further information, please ask
Ormazabal.

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General description General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
1.5. Dimensions and weights
Figure 1.5. Dimensions cgm.3
Cubicle Width (a)
[mm]
Depth (f)
[mm]
Height (h)
[mm]
Bushings height (g)
[mm]
Cable fastening
height (i)
[mm]
Weight
[kg] Gas output
l 418 860 1305 603 135.5 145
Downwards
through cable
trench
v 595 860 1305 256 0 235
rc 378.5 860 1305 845.5 133 35
ma 595 1152 1800 845.5 453 135
rbv* 595 860 2050 487 110 305
lv* 595 860 2050 487 110 325
l 418 860 1305 603 135.5 145
Upwards through
relief duct
(chimney)**
rc 378.5 1152 1305 845.5 133 45
ma 595 1152 1800 845.5 453 135
rbv* 595 1152 2050 487 110 325
lv* 595 1152 2050 487 110 345
* In the generator incoming cable compartment the gases output is directly upwards.
** Chimney depth: 292 mm.
Table 1.7. Cubicle dimensions and weights

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General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
General description
1.6. Operating conditions
Installation Indoor
Maximum ambient temperature + 40 °C
Minimum ambient temperature - 5 °C /- 30 °C(b)
Maximum mean ambient temperature, measured over a 24-hour period + 35 °C
Maximum mean relative humidity, measured over a 24-hour period < 95 %
Maximum mean relative humidity, measured over a 1-month period < 90 %
Maximum mean vapour pressure, measured over a 24-hour period 2.2 kPa
Maximum mean vapour pressure, measured over a 1-month period 1.8 kPa
Maximum height above sea level 2000 m
Solar radiation Negligible
Ambient air pollution (dust, smoke, corrosive and/or ammable gases, vapours or salt) Insignicant
Vibrations caused by causes external to the switchgear or by seismic movements Insignicant
(b) Storage: - 40 °C.
Table 1.8. Cubicle operating conditions
The specications refer to the section 'Normal service
conditions for indoor cubicles' in the IEC 62271-1
standard 'Common specications for high-voltage
cubicles'.
For special service conditions: ambient temperature
above +40ºC, installation between 2000 and 4000 m
above sea level, signicant pollution level, or others
dierent to those described, check with Ormazabal.

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Handling and transport General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
2. Handling and transport
[3] Position the rear of the cubicle facing the conductor, to avoid damaging the front.
Important: During transport, the switchgear must
be perfectly seated and xed so that it cannot move
about and possibly damage the equipment.
2.1. Lifting equipment
The switchgear must always be kept upright, either directly
on the oor or on a pallet, depending on the type of
handling involved.
Handling should use one of the following methods:
1. Using a forklift truck or pallet truck[3].
Figure 2.1. Lifting a cgm.3-huv modular cubicle using a forklift truck.

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General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
Handling and transport
2. Lifting using slings or chains xed to the lifting brackets
on the sides of the top of the cubicle. The angle of pull
should be as vertical as possible (with an angle greater
than 60º from the horizontal).
Figure 2.2. Lifting a cgm.3-huv-l modular cubicle with chains. Figure 2.3. Lifting a cgm.3-huv-lv compact cubicle with chains.
3. If it is not possible to use the aforementioned methods,
rollers may be used underneath the switchgear. Another
option is to slide the cubicles over rods (these same
rods can be used to help get over the cable trench).
Once the corresponding operations have been
completed, remove the two lifting angles from the
cubicle unscrewing the three M8 screws of each lifting
angle.
Figure 2.4. Removing the lifting angles
With the lifting angles of the cgm.3.huv-lv or cgm.3-rbv,
an additional functional unit can be lifted.

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Storage General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
3. Storage
If it needs to be stored, the equipment must be placed on
dry ground or on top of damp-proof insulating material, still
in its original packing.
After prolonged storage, clean all the insulating parts
carefully before commissioning the equipment. The
enclosure should be cleaned with a clean, dry lint-free cloth.
Figure 3.1. Storage conditions
Storage must always be INDOORS, with the following
conditions recommended:
1. Ambient air temperature should not exceed 40 ºC
and its mean value, measured in a period of 24 hours,
should not exceed 35 ºC.
2. The ambient air temperature must not drop below
- 5 °C. There are also cubicles with storage temperature
up to - 40 °C.
3. The switchgear must be protected from direct solar
radiation.
4. Altitude, both in transport and in storage, must not
exceed 2000 m.
5. The environmental air must not have any signicant
contamination from dust, smoke, corrosive and/or
inammable gases, vapours or salt.
6. The switchgear must be protected from the rain, and
the humidity conditions must be as follows:
a. the average relative humidity value, measured over
a period of 24 hours, must not exceed 95 %.
b. the average water vapour pressure value, measured
over a period of 24 hours, must not exceed 2.2 kPa.
c. the average relative humidity value, measured over
a period of one month, must not exceed 90 %.
d. the average water vapour pressure value, measured
over a period of one month, must not exceed
1.8 kPa.
7. During transport, vibrations caused by external factors
or seismic movements must be insignicant.
Any other conditions must be notied beforehand,
since the equipment must be factory-adjusted to
atmospheric pressure at the destination.
If this is not the case, the pressure gauge needle may
indicate an incorrect value, even if the equipment's
internal pressure is correct.

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General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
Installation
4. Installation
[4] It is advisable to cut the cellophane at the rear of the cubicle or at the corner to avoid scratching the surface.
Tightening torques:
- M8: 20 Nm
- M10: 40 Nm
4.1. Unpacking the equipment
The cgm.3-huv system switchgear is supplied protected by
plastic packing as standard.
On receiving the equipment, check that the goods supplied
match the order and associated documentation. If this is
not the case, contact Ormazabal immediately.
The disassembly process for the equipment is as follows:
1. Use a blade, cutter or similar tool to cut the cellophane
the cubicle is wrapped in[4].
2. Completely remove the cellophane.
3. Detach the white polystyrene corner pieces.
4. Unscrew the xings between the base and the pallet.
5. Remove the pallet, handling the cubicle as indicated in
section 2.1.
6. Unpack the accessory box located at the rear or on top
of the cubicle.
7. Remove the self-adhesive protective plastic from the
cable compartment cover.
The self-adhesive plastic must be removed from the
cable compartment cover so that the equipment
enclosure's earth connection may have the proper
electrical continuity.
8. Dispose of any waste in an environmentally friendly
manner.
It is advisable to make a visual inspection of the equipment
to check whether it has suered any damage in transit. If
damaged, contact Ormazabal immediately.

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Installation General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
4.2. Positioning accessories during transport
A number of accessories are supplied with the cubicles,
located as indicated in the gures below:
Depending on the cubicle model, the accessory box
contains some of the following items:
• Ormazabal General Instructions document IG-308
• Actuating lever
• Spring charge lever
• Cubicle connecting kit:
- ormalink
- Springs
- Syntheso grease
- Earthing bar
• End plug kit:
- Cubicle end assembly
- Nylon thread
- Plastic plugs
- Side cover
• Fixing to oor assembly
• Phase separators for cgm.3-huv-lv and cgm.3-huv-rbv
Figure 4.1. Location of accessories in cgm.3-huv-l and cgm.3-huv-v
cubicles

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General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
Installation
4.3. Minimum installation distances
[5] For any questions, please ask Ormazabal.
[6] In each case, bear in mind which cable is to be used in the particular installation.
The minimum distances to the walls and roof which must
be maintained in the facility are as follows:
Figure 4.2. Minimum installation distances
Minimum distances [mm]
Side wall (a) 100
Roof (b) 1050
Front clearance (c) 500*
Function Rear wall (d)**
-l/-v/-rc/-ma/-lv/-rbv 100
* An operating clearance of 1000 mm is recommended.
** 800 in the case of AFLR
Table 4.1. Minimum distances
The measurements indicated in the table have been
obtained in accordance with the dimensions of the
test room for the gas-lled modules, according to
Annex A of Standard IEC 62271-200.
The space required to extend the assembly with an
additional cubicle is 250 mm plus the width of the new
cubicle[5].
4.4. Recommended cable connection trenches
Minimum recommended dimensions based on the trench
dimensions used in the tests in accordance with Standard
IEC 62271-200. These dimensions may vary in accordance
with the radius of curvature of the cables used[6].

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Installation General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
4.4.1. Cubicles with internal arc classification IAC up to 25 kA - 1 s
[7] In each case, bear in mind which cable is to be used in the installation.
Feeder and cable rise function
Front and rear cable input or output (D1)
Side cable input or output (D2)
Figure 4.3. Dimensions [mm] of the cable trench for cgm.3-huv-l and
cgm.3-huv-rc
Trench necessary for the feeder and cable rise function
Cable details Approximate
radius of
curvature*
[mm]
Minimum depth
Cable insulation Cable type
Cable
section
[mm2]
Cable
diameter
[mm]
D1 [mm] D2 [mm]
Height
1400 mm***
Dry insulation
One-core 18/30 kV
< 150** 41 555 500 800
185 43 590 550 900
240 45.2 640
300 47.5 685 650 1000
400 48 745
Three-core 18/30
kV < 150 92.7 805 950 950
Height
1745 mm
Dry insulation
One-core 18/30 kV
< 150** 41 555 370 500
185 43 590 370 550
240 45.2 640
300 47.5 685 370 660
400 48 745
Three-core 18/30
kV < 150 92.7 805 650 650
* Check against the data of the manufacturer of the cable used.
** 150 mm2cable valid up to 21 kA.
*** Exclusively for -l cubicles.
Table 4.2. Trench necessary for the feeder and cable rise function

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General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
Installation
Circuit-breaker function with AV/RAV driving mechanism
Front and rear cable input or output (D1)
Side cable input or output (D2)
Figure 4.4. Dimensions [mm] of the cable trench for cgm.3-huv-v with
AV/RAV driving mechanism.
Trench necessary for the circuit-breaker with AV/RAV driving mechanism function
Cable details Approximate
radius of
curvature*
[mm]
Minimum depth
Cable insulation Cable type
Cable
section
[mm2]
Cable
diameter
[mm]
D1
[mm]
D2
[mm]
Height
1400 mm***
Dry insulation One-core 18/30 kV
< 150** 41 555 750 750
185 43 590 800 800
240 45.2 640
300 47.5 685 850 900
400 48 745
Three-core 18/30 kV < 150 92.7 805 1200 1200
Height
1745 mm
Dry insulation One-core 18/30 kV
< 150** 41 555 400 400
185 43 590 400 500
240 45.2 640
300 47.5 685 500 600
400 48 745
Three-core 18/30 kV < 150 92.7 805 850 850
* Check against the data of the manufacturer of the cable used.
** 150 mm2cable valid up to 21 kA.
*** Exclusively for -v cubicles.
Table 4.3. Trench necessary for the circuit-breaker with AV/RAV driving mechanism function

IG-308-EN version 01; 03/06/2022
20
Installation General instructions
cgm.3-huv system: Fully gas-insulated
medium-voltage switchgear
Metering function and auxiliary services
Figure 4.5. Dimensions [mm] of the cable trench for cgm.3-huv ma
Trench necessary for the metering function and auxiliary services
Cable insulation Cable type
Cable
section
[mm2]
Cable
diameter
[mm]
Approximate
radius of
curvature*
[mm]
Minimum depth
D2
Dry insulation One-core 18/30 kV
< 150 41 555 600
185 43 590 650
240 45.2 640 700
300 47.5 685 750
400 48 745 800
< 150 92.7 805 850
* Check against the data of the manufacturer of the cable used.
Table 4.4. Trench necessary for the metering function and auxiliary services