DF-DT (G) - SGC - SwitchGear Company

DF-DT (G) - SGC - SwitchGear Company
DF-DT (G)
MEDIUM VOLTAGE SWITCHGEAR
THE MODULAR CONCEPT
User Manual
SGC - SwitchGear Company nv - Moorstraat 24 - B-9850 Nevele - Belgium
 +32 (0)9/321.91.12 - Fax +32 (0)9/321.91.13 - e-mail: [email protected] website: www.switchgearcompany.eu
© 2013 SwitchGear Company nv.
All rights reserved.
The information provided may not be reproduced and/or published in any way and by any means (electronic or
mechanical), without the prior, explicit written authorisation of SwitchGear Company nv
The information provided is based on general data concerning the construction known at the time of publication, material
qualities and working methods, so that the right to make changes is reserved.
The information given is applicable to the standard version of the DF-2 Medium Voltage Switchgear. Therefore
SwitchGear Company nv. cannot be held liable for any damage resulting from specifications that differ from the standard
version of the DF-2 Medium Voltage Switchgear.
The available information has been assembled with the greatest possible care but SwitchGear Company nv. cannot be
held liable for any mistakes in the information or the consequences thereof.
The user names, trade names, trademarks, etc, used by SwitchGear Company nv. in accordance with the legislation
concerning the protection of trademarks cannot be considered to be free.
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User Manual – DF-DT (G)
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CONTENTS
CONTENTS ...................................................................................................iii
PREFACE......................................................................................................iv
This document .........................................................................................................................iv
Pictograms and safety symbols in and on the medium voltage switchgear...............................iv
Pictograms used in this manual ............................................................................................... v
Related documentation ............................................................................................................ v
Service and technical assistance .............................................................................................vi
Identification of the cubicles .....................................................................................................vi
General safety directions and instructions ............................................................................... vii
Intended Use ......................................................................................................................... viii
1 GENERAL DESCRIPTION ................................................................... 1-1
1.1
1.2
1.2.1
1.2.1.1
1.2.1.2
1.2.1.2.1
1.2.1.2.2
1.2.1.3
1.2.2
1.2.3
1.2.3.1
1.2.4
1.2.4.1
1.2.4.2
1.2.4.3
DF-DT (G), the modular concept ......................................................................... 1-1
Compartments..................................................................................................... 1-1
Control and low-voltage compartment ................................................................. 1-2
Synoptic diagram ................................................................................................ 1-3
Drive mechanism ................................................................................................ 1-4
Drive mechanism combination load break switch - earthing switch...................... 1-4
Drive mechanism circuit breaker ......................................................................... 1-4
Options and accessories ..................................................................................... 1-4
Bus bar compartment .......................................................................................... 1-5
Apparatus compartment ...................................................................................... 1-5
Load break switch ............................................................................................... 1-5
Cable compartment ............................................................................................. 1-5
Earthing switch .................................................................................................... 1-5
Circuit breaker ..................................................................................................... 1-6
Provisions for securing the supply cables ............................................................ 1-6
2 INSTALLATION .................................................................................... 2-1
2.1
2.1.1
2.1.2
2.1.2.1
2.1.2.2
2.1.2.3
2.1.2.4
2.1.2.5
2.1.2.6
2.1.2.7
Safety guidelines - installation ............................................................................. 2-1
General ............................................................................................................... 2-1
Recommendations - installation room ................................................................. 2-1
Floor surface ....................................................................................................... 2-1
Environmental Conditions ................................................................................... 2-2
Ventilation ........................................................................................................... 2-2
Free height of the installation area ...................................................................... 2-3
Dimensions of the access doors to the installation area ...................................... 2-3
Free space in front of the cubicles ....................................................................... 2-3
Internal arc resistance ......................................................................................... 2-4
3 MOUNTING........................................................................................... 3-1
3.1
3.2
3.2.1
3.2.2
Anchoring the cubicle .......................................................................................... 3-1
Assembling the cubicles ...................................................................................... 3-3
Coupling cubicles ................................................................................................ 3-3
Assembly of the bus bars .................................................................................... 3-3
4 INITIAL COMMISSIONING ................................................................... 4-1
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iii
PREFACE
This document
This document is intended as a reference for qualified and trained operators to operate the
medium voltage switchgear in a safe and economical way.
This document uses the term “medium voltage switchgear” to denote a random, but in
actual practice, existing combination of DF cubicles that, mutually coupled and connected,
constitute a client-specific transformation or distribution station. See: “General description”.
The chapters and sections are numbered. The page numbers (consisting of the chapter
number and the page number) and the document code can be found at the bottom of
every page.
In the documentation the words “left”, “right”, “front” and “behind” are used to indicate a
specific part of the medium voltage switchgear. The starting point is always the position of
the operator, standing in front of the medium voltage switchgear, facing the switchgear.
Pictograms and safety symbols in and on the medium voltage
switchgear
Depending on the version, the following pictograms are used on the medium voltage
switchgear:
WARNING
High Voltage Danger
Access to this cubicle is only allowed after this cubicle and both the directly
adjacent cubicles (previous and next one) are voltage-free.
WARNING
Drilling prohibited.
Drilling is strictly prohibited on surfaces bearing this pictogram.
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Pictograms used in this manual
The following pictograms apply to the medium voltage switchgear user documents:
CAUTION!
A procedure that can, if not carried out with the proper care, result in damage to
the medium voltage switchgear, the surrounding area or the environment.
WARNING
High Voltage Danger
CAUTION!
Clamping danger
WARNING
Drilling prohibited.
Drilling is strictly prohibited on surfaces bearing this pictogram.
Notes, suggestions and advice.
Render this cubicle, the next one and the previous cubicle, voltage-free, before
carrying out the work described.
Open the load break switch and the earthing switch before carrying out the work
described in the manual.
Consult the indicated information sources first.
Protect the medium voltage switchgear from water or damp.
Related documentation
The following technical documentation for medium voltage switchgear is available:
•
User manual DF-2
•
User manual DF-3
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v
Service and technical assistance
For information concerning specific settings, maintenance or repair work that is not
mentioned here, please contact SGC - SwitchGear Company nv.
• When contacting SGC - SwitchGear Company nv, always provide the following
information:
−
Cubicle type and voltage
−
Serial number of the cubicles
Identification of the cubicles
Every cubicle of the medium-voltage switchgear is equipped with a type plate (Figure 1 A)
and a stamped serial number (Figure 1 B).
Type Plate (Figure 1 A)
The type plate denotes:
• Cubicle type
• Serial number
• Voltage
• Supplementary technical specifications
Serial Number (Figure 1 B)
Next to the type plate, the stamped serial number can also be found on the front side of
the lateral wall or on the horizontal wall, around the front panel. The serial number is
visible after disassembling the front panel.
Figure 1: Identification of the cubicles
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General safety directions and instructions
SGC - SwitchGear Company nv does not accept any liability for damage or injury caused
by not (strictly) following the safety directions and instructions, or by negligence during the
installation, the use, the maintenance, or the repair of the medium voltage switchgear and
its (possibly) additional options.
Depending on any specific user circumstances, or depending on any additional, fitted
options, extra safety instructions may be required. Please contact SGC - SwitchGear
Company nv immediately if you encounter a potential danger during the operation of the
medium voltage switchgear.
The owner/operator of the medium voltage switchgear is fully responsible at all
times for observing the locally applicable safety instructions and guidelines.
User manual
• Anyone who uses or operates the medium voltage switchgear, must be familiar with
the contents of the user manual, and follow the directions contained within very
closely. The owner/operator must educate the users in accordance with the user
manual and he or she must obey all directions and instructions.
• Never change the order of the required actions.
• Always keep the user manual close to the medium voltage switchgear.
Pictograms and safety symbols
The pictograms, symbols and instructions applied to the medium voltage switchgear are a
part of the safety equipment. They may therefore not be covered or removed, and must be
present and clearly readable throughout the entire life cycle of the medium voltage
switchgear.
• Replace or repair unreadable or damaged pictograms, symbols and instruction
immediately. Contact SGC - SwitchGear Company nv for replacements.
Operators
The execution of the work detailed herein (transport, installation, use and maintenance) is
strictly reserved for trained and qualified operators, who are familiar with the dangers that
may arise from operating the material. Temporary employees and personnel in training
cannot operate the medium voltage switchgear under any circumstances.
Technical specifications
• Technical specifications must not be changed.
• Modification of the medium voltage switchgear (or parts thereof) is not permitted.
Transport, storage, installation, operation and maintenance
• See corresponding documents:
−
“Safety guidelines – transport”
−
“Safety guidelines – storage”
−
“Safety guidelines – installation”
−
“Safety guidelines – operation”
−
“Safety guidelines – maintenance”
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vii
Intended Use
The medium voltage switchgear is designed exclusively for use as transformation and
distribution stations, according to the guidelines and conditions provided by SGC SwitchGear Company nv. Every other different or extended use, does comply with the
intended use. 1
SGC - SwitchGear Company nv does not accept any liability for damage(s) or injuries
resulting from deviation(s) of the intended use.
The medium voltage switchgear complies with the current norms and guidelines. See:
Technical Brochure.
•
Operate the medium voltage switchgear strictly in a technically perfect condition, in
accordance with the intended use outlined above.
Leave the sealed connections entirely intact, at all times. Breaking the sealed
connections irrevocably voids any guarantee claims.
1
The “Intended use” as defined in EN 292-1 “is the use for which the technical product is suited as specified
by the manufacturer including his directions in the sales brochure.” In case of doubt, it is the use that can be
deduced from the construction, the model and the function of the technical product that is considered normal
use. Operating the product within the limits of its intended use also involves observing the instructions in the
user manual.
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1
GENERAL DESCRIPTION
1.1
DF-DT (G), the modular concept
SGC - SwitchGear Company’s DF-DT (G) offers the capability to custom assemble
any required transformation or distribution switchgear in a rational and economic way, by
using a number of functional basic modules: DF-2 and DF-3 cubicles.
By correctly combining these basic modules (and their possible options), a customerspecific medium voltage switchgear is created (with a nominal voltage of 12, 17.5 or 24
kV) that offers a high level of operator safety. The technical specifications of your medium
voltage switchgear can be found on the type plates on the cubicles. See “Identification of
the cubicles”.
The modularity of the DF-DT(G) concept is not limited to the ability to build various
configurations with the DF-2 and DF-3 cubicles. Each separate DF-DT(G) cubicle is also
an assembly of modules that – built into the compartments created for this purpose determine the function of that particular cubicle. See “1.2 Compartments”.
1.2
Compartments
DF-DT(G) cubicles consist of 4 compartments. The design of these compartments
determines the functionality of the cubicle.
The respective compartments are:
A. Control and low-voltage compartment
B. Bus bar compartment
C. Apparatus compartment
D. Cable compartment
Figure 2: Medium-voltage switchgear compartments
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1-1
1.2.1
Control and low-voltage compartment
The control and low-voltage compartment is located behind the removable front panel.
Depending on the implementation, inside and on this compartment one of the following
items can be found:
•
•
•
•
•
•
•
Synoptic diagram (on the front panel) with:
o controls and indicators of the load break switch
o controls and indicators of the circuit breaker, the controls can be integrated in
the synoptic diagram, or they can be located behind the front panel (to be
specified when ordering)
Load break switch drive mechanism
Control module circuit breaker
Protection relay
Voltage indicators
Manual trip possibility on circuit breaker
Options and accessories (i.e. auxiliary contacts, closing and under-voltage release,
key interlocks, minimum voltage relays, motor operation, etc. And all required
electrical connection options)
Figure 3: Low-voltage compartment after removing the front panel
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1.2.1.1 Synoptic diagram
The synoptic diagram (Figure 4) on the front panel provides a schematic overview of how
the current flows and of the different positions of the sub components of the particular
cubicle.
Color codes may vary from country to country. Your medium voltage
switchgear is equipped with color codes valid in your country.
Figure 4: Synoptic diagram DF-DT(G)
A.
B.
C.
D.
E.
F.
Current flow diagram
Indicator 'position load break switch' (open / closed)
Indicator 'position circuit breaker' (open / closed)
Indicator 'position earthing switch' (open / closed)
Voltage indicators
Control field earthing switch
The arrow on the control field indicates the required turning direction for opening (0)
and closing (I) the earthing switch.
G. Control field load break switch
The arrow on the control field indicates the required turning direction for closing (I)
the load break switch.
H. Manual trip circuit breaker
The manual trip can only be used if the pressure buttons (here located behind the
front panel) do not function as the result of auxiliary voltage dropping off.
I. Protection relay
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1-3
1.2.1.2 Drive mechanism
DF-DT(G) cubicles are equipped with a drive mechanism to control the load break switch
and the circuit breaker. The drive mechanism is located behind the front panel.
1.2.1.2.1 Drive mechanism combination load break switch - earthing switch
Depending on the implementation, the load break switch and/or the earthing switch is
operated manually or by a motor. Manual operation is performed by using the handle.
Operation of the load break switch and the earthing switch is housed in a single drive
mechanism. Both switches have their own, independent operational axis. The operational
axes are mechanically connected (interlocked) to prevent incorrect switching operations.
1.2.1.2.2 Drive mechanism circuit breaker
Depending on the implementation, the circuit breaker is operated locally or remotely.
Local, manual operation is performed by using pressure buttons available behind the front
panel.
Figure 5: Drive mechanism DF-DT(G)
1.2.1.3 Options and accessories
For every cubicle type, different options are available.
Contact SGC - SwitchGear Company nv for more information.
1-4
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1.2.2
Bus bar compartment
The bus bar compartment is located behind the control and low voltage compartment. The
various cubicles of the medium voltage switchgear are electrically connected by means of
a bus bar.
The modular bus bar consists of three bars, made from electrolytic copper F25, which
should be fitted when the medium voltage switchgear is installed.
See 3.2.2 Fitting the bus bars.
1.2.3
Apparatus compartment
The apparatus compartment is between the bus bar compartment and the cable
compartment. This compartment houses the load break switch.
1.2.3.1 Load break switch
The RV 44 load break switch acts as the physical segregation between the bus bar
compartment and the cable compartment. The load break switch is filled with SF6 gas
(sulphur hexafluoride) and sealed for life. The special characteristics of the SF6 gas in the
casing fulfil an isolating as well as an arc extinguishing function. The load break switch is a
double-position switch that connects or interrupts the electrical voltage between the high
voltage cables and the bus bar.
The position of the load break switch is clearly indicated on the synoptic diagram.
Depending on the implementation, the load break switch is operated manually or
electrically. See "1.2.1.2 Drive mechanism".
1.2.4
Cable compartment
The cable compartment is behind the interlocked, removable door. Depending on the
implementation, this compartment contains one or more of the following items:
• EM-98 earthing switch
• Circuit breaker
• Provisions for securing the supply cable(s)
1.2.4.1 Earthing switch
The EM-98 earthing switch is located underneath the RV 44 load break switch, on the right
wall of the cubicle. Switching is done in air (in contrast to that of the load break
switch). The earthing switch is a two-position switch that opens the earthing knife (no
earthing) or closes it (visible earthing).
The position of the earthing switch is clearly indicated on the synoptic diagram.
Depending on the implementation, the load break switch is operated manually or
electrically. The earthing switch is housed with the load break switch in one, mechanically
interlocked drive mechanism. See "1.2.1.2 Drive mechanism".
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1-5
1.2.4.2 Circuit breaker
The circuit breaker, which is fixed into place, acts as protection of the output feeders,
transformers or motors.
DF-DT(G) type cubicles, allow the following components to be integrated in the cable
compartment:
• Current transformers
• Voltage transformers on the rail side
• Voltage transformers on the generator side
• Overvoltage protection (Surge arresters)
• Muffle resistance
1.2.4.3 Provisions for securing the supply cables
The following provisions allow the supply cables to be connected quickly and easily:
• removable floor panels with grommets
• fixed cable supports
• adjustable cable supports (depth)
The connections fitted to your medium voltage switchgear have been adjusted for
your specific operating voltage.
Figure 6: Cable compartment of the DF-DT(G) medium voltage switchgear
1-6
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2
INSTALLATION
2.1
Safety guidelines - installation
2.1.1
General
Installation of the medium voltage switchgear is reserved strictly for trained and
authorized operators, who respect the locally applicable safety prescriptions &
guidelines.
The actual connection and first start-up is to be performed by trained and
authorized personnel in service of the power supply company.
•
•
•
See also: "General safety prescriptions and instructions".
Never leave tools or equipment behind in, or on, the medium voltage switchgear.
Install the medium voltage switchgear exclusively in spaces that fully comply with the
following recommendations (according to IEC 60298)
2.1.2
Recommendations - installation room
Recommendations regarding the installation room parameters are subdivided in
recommendations concerning:
•
floor surface
•
environmental conditions
•
air circulation
•
free height of the installation area
•
dimensions of the access doors to the installation area
•
free space in front of the cubicles
•
internal arc resistance
2.1.2.1 Floor surface
The surface fit for the medium voltage switchgear placement, needs to be sufficiently
strong and perfectly flat. The maximum allowed difference in level is 2 mm/m.
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2.1.2.2 Environmental Conditions
DF-DT(G) cubicles have been designed for indoor installation, provided that the following
environmental conditions are met:
description
environmental temperature
relative air humidity (%)
installation altitude (m.a.s.l.)
values
min. -15 °C - max. +45 °C
min. 10% - max. 70% (without condensation)
max. 1.000 m above sea level
Table 1: Environmental conditions
Consequently:
• Avoid installation in dusty areas.
• Avoid installation in areas with a high level of relative air humidity.
• Avoid installation in areas susceptible to possible lightning strikes.
• Avoid installation in areas where cubicles may be exposed to aggressive gases or
fluids.
Contact SGC - SwitchGear Company nv if the cubicles need to be or installed in
places where the required environmental conditions cannot be guaranteed.
2.1.2.3 Ventilation
•
•
Ensure proper air circulation in the installation area.
Secure the air circulation openings to prevent small animals or rodents from gaining
access to the installation area.
Particularly when the medium voltage switchgear contains one or more transformer
cubicles, special attention needs to be placed on air circulation. Consult the table below to
calculate the corresponding values. The table displays capacity losses with regard to the
capacity of the cast resin transformers.
Transformer Capacity
(KVA)
100
160
250
315
400
500
630
800
1.000
1.250
1.600
2.000
P (W)
1.605
2.175
2.850
3.412
4.012
4.837
5.745
6.787
7.875
10.350
12.450
16.125
Table 2: Overview of capacity losses in cast resin transformers
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2.1.2.4 Free height of the installation area
The free height of the installation room has to be at least 2.000 mm. Depending on the
distribution network manager however, a larger minimum free height may be required. An
ideal free height, universally accepted by all distribution network managers, is 2.500 mm.
Dry transformers with a capacity of ≥ 1250 KVA require a minimal height of at
least 2.500 mm.
2.1.2.5 Dimensions of the access doors to the installation area
The provided height and width measurements apply to all doors that offer access to the
installation room. These minimum requirements also apply if the installation room is not
directly accessible from the outside.
description
Height of the access door
Width of the access door
value
min. 2.200 mm
min. 100 mm + width of the widest cubicle
Table 3: Dimensions of the access doors
If the medium voltage switchgear does not contain any transformer cubicle(s), a
minimal door height of 2.000 mm suffices. If a transformer cubicle has been
included, the dimensions of the transformer always need to be taken into
account. For the correct dimensions of the different cubicles, please see:
“Dimensions & weights”.
If the medium voltage switchgear is to be installed in basements or cellars, an
access hatch is required, with a length and width of at least 400 mm larger than
the dimensions of the largest cubicle or transformer.
2.1.2.6 Free space in front of the cubicles
The free space in front of the cubicles depends on the assembly of the medium voltage
switchgear.
If the medium voltage switchgear does not contain any transformer cubicle(s),
the minimum free passage is 800 mm. Medium voltage switchgear with a
transformer cubicle with a capacity of ≥ 1.000 KVA requires a free passage of at
least 2.000 mm.
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2-3
2.1.2.7 Internal arc resistance
To prevent major material damage, serious physical injury or electrocution in the (unlikely)
event of an internal arc, the following installation guidelines apply:
• Between the rear side of the cubicles and the wall of the installation room, ample free
space needs to be provided, as displayed in Figure 7. This layout corresponds with an
assembly where the side plates of the cubicles reach the rear side of the installation
room. As a result, the free space behind the cubicles is entirely closed off. Consequently,
a possible internal arc will trigger the overpressure system of the rear plates.
Figure 7: Top view of installed cubicles
A transformer cubicle can always be placed with its rear side against the wall.
Figure 8: Minimal free height
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•
•
Anchor each cubicle of the medium voltage switchgear to the floor using 4 bolts. See
3.1 Anchoring the cubicle.
Connect each cubicle mutually using the provided fixing materials. See 3.2 Assembly
of the cubicles.
Medium voltage cubicles installed according to the aforementioned guidelines always
restrict an internal arc to its compartment of origin.
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2-5
3
MOUNTING
3.1
Anchoring the cubicle
Figure 9: Coupling DF-3 field to DF-2
Consult the installation plans, the electrical schematics, and the floor plans
before starting with the actual positioning of the medium voltage switchgear.
For horizontal dimensions, please refer to the corresponding cubicle’s general
user manual since they are cubicle-specific.
Leave the indicated free space between the rear side of the cubicle and the wall
of the installation room to allow the overpressure system of the rear plates to
function properly. A transformer cubicle can be placed with its rear side against
the wall.
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3-1
•
Position the first cubicle level, in its definitive place in the installation area.
•
Anchor the first cubicle to the floor by using four bolts. Use the provided openings as
illustrated in figure Figure 10.
Figure 10: Mounting: Anchoring DF-DT(G) cubicle
•
Disassemble the front panel (Figure
11): Unscrew the 4 hexagonal tap
bolts (C). Remove the 4 spring
washers (B). Remove the front panel
(A). The control and low-voltage
compartment is now accessible.
•
Position the second cubicle against
the first one.
Figure 11: Disassembling front panel of DFDT(G)
Ensure that the cubicles remain exactly aligned and perfectly level to enable a
torque-free assembly of the frame, the earthing copper connection pieces, and
the bus bar.
Possibly included cubicle bases are factory-included and are provided
individually. Install the cubicles in the correct order according to the installation
plans and the electrical schematics.
•
•
3-2
Install each remaining cubicle accordingly and ensure that all front panels have been
removed.
Remove the lifting lugs on the cubicles (where available), by unscrewing the bolts. The
cubicles are now ready to be a assembled. See 3.2 Assembling the cubicles.
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3.2
Assembling the cubicles
When assembling the cubicles, the following important steps apply:
•
Coupling the cubicles
•
Assembling the bus bars
•
Securing coupling piece DF-3 / DF-2 (if applicable)
3.2.1
Coupling cubicles
If the DF-DT(G) is coupled to medium voltage of the following type:
• DF-2/DF-2+ please refer to the corresponding user/installation manual
• DF-3/DF-3+ please refer to the corresponding user/installation manual
3.2.2
Assembly of the bus bars
If the DF-DT(G) is coupled to medium voltage of the following type:
• DF-2/DF-2+ please refer to the corresponding user/installation manual
• DF-3/DF-3+ please refer to the corresponding user/installation manual
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4
INITIAL COMMISSIONING
The actual connection to the distribution grid and the first commissioning of the medium
voltage switchgear can only be carried out by authorized and trained personnel in service
of the power supply company, and by strictly obeying the locally applicable safety
guidelines.
Notes:
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©2013 SGC n.v.
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