Download 3. Corrosive atmosphere features

Specification for Tender
565323971
General Specifications for High-Power
Distribution and Motor Control LV
Switchboard
1. Requirements for the design of an installation system
2. Seismic features
3. Corrosive atmosphere features
4. Internal arc features
5. Marine features
6. Project-specific requirements
Last update : 2017-06-29
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Specification for Tender
565323971
Table of contents:
1. Requirements for the design of an installation system ……………………………….........
p. 3
1.1 General………………………………………………………………………………………..
p. 3
1.2 Enclosures……………………………………………………………………........................
p. 3
1.3 Busbars……………………………………………………………………….........................
p. 4
1.4 Functional units ……………………………………………………………………...............
p. 4
1.5 Installation, maintenance and upgradeability ……………………………..............................
p. 4
2. Seismic features …………………………………………………………………...................
p. 5
3. Corrosive atmosphere features …………………………………..........................................
p. 5
4. Internal arc features ……………………………………………………………………..... ..
p. 5
5. Marine features ………………………………………………………………......................
p. 5
6. Project-specific requirements …………………………………………………………........
p. 5
6.1 Environmental conditions ……………………………………………………………..........
p. 5
6.2 Network electrical data ……………………………………………………………...............
p. 6
6.3 Switchboard electrical data …………………………………………………….....................
p. 6
6.4 Connections……………………………………………….....................................................
p. 6
6.5 Cross-section of auxiliary cables ………………………………………………....................
p. 6
6.6 Switchgear assembly ……………………………………………………………..................
p.7
Last update : 2017-06-29
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Specification for Tender
565323971
1. Requirements for the design of an installation system
1.1 General
The LV switchboard(s) will conform to IEC 60439-1 and be subjected to the 10 tests defined by this
international switchboard design standard.
Seven type tests performed by the manufacturer:
No. 1 – temperature-rise limits
No. 2 – dielectric properties
No. 3 – short-circuit withstand strength
No. 4 – electrical continuity of the protective circuit
No. 5 – clearance and creepage distances
No. 6 – mechanical operation
No. 7 – degree of protection
Three separate tests performed by the supplier:
No. 8 – wiring, electrical operation
No. 9 – insulation
No. 10 – protective measures
The batch contractor must provide the certificate numbers or the certificates of conformity for the seven type
tests performed by the manufacturer, in addition to a copy of the first pages of these test certificates.
A conformity sheet signed by the installer confirming that these three routine tests have been carried out will
be provided with the switchboard.
It will satisfy EMC conformity requirements. It will be designed for use in a type A environment in
accordance with IEC 60439-1. In particular, the design of the functional volumes will ensure that the
sensitive circuits are isolated from the power conductors.
To guarantee consistency of installed equipments, the switchboard system and the switchgear will be
supplied by the same manufacturer.
1.2 Enclosures
To ensure the reliability, the influence of the ambient temperature and switchboard IP will be taken into
account in the design of the switchboard. Where necessary, the switchgear assembly will be derated. The
manufacturer will use special software or tables to justify such derating.
The switchgear design will include a degree of protection to IP31, 42 or 54 as specified by IEC 60529. In the
event of the doors of the functional units being open in the test position or removed, its degree of protection
will be IP2X or IPXXB. The degree of mechanical protection will be IK10.
Last update : 2017-06-29
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Specification for Tender
565323971
1.3 Busbars
To facilitate the connections, the main busbar will be installed at the top of the columns, with the design
allowing for cables or busbar trunking systems to be connected via the top, bottom, front or back, without
changing the position of the busbar or the height of the switchboard.
Upgrading will be facilitated by the use of a main busbar with a constant cross-section consisting of 10 mm
x 40 mm rectangular copper bars varying in number according to the rated current. The quality of the copper
will be Cu-ETP R240.
Harmful thermal effects and electromagnetic radiations will be minimized by arranging the different phases
in a rectangular pattern and the neutral and phase busbars running in the same functional volume.
The main busbar fishplating will be made using preinstalled sliding fishplates arranged to enable all the
operations to be performed without hindrance from the power cables. For maintenance purposes, it will be
possible to remove a column from the centre of the switchboard and reinsert it without affecting the adjacent
columns.
To make it easier to upgrade the facility, the distribution busbar will be installed in an IP2x or IPxxb
compartment and allow functional units with an output of up to 630 A to be added without interrupting the
power supply on these busbars by connecting them with plugs instead of screws.
The distribution busbar will consist of 10 mm thick rectangular copper bars that will vary in width
(40 to 120 mm), depending on the rated current. The quality of the copper will be Cu-ETP R240.
1.4 Functional units
To make them easier to operate and maintain, all functional units of the same type and rating will be
interchangeable, unless a foolproofing system is installed.
To facilitate upgrading, it will be possible to add a functional distribution and motor control unit of up to 630
A in the same column, without interrupting the power supply.
To satisfy operating and maintenance requirements, the installation system will accept FFF, WFD, WFW
and WWW functional units.
The system used to connect the functional units must not cause any wear and tear on the distribution busbars
during plugging-in/drawing out.
In the case of withdrawable functional units, changing from one position to another must be mechanically
latched. The position of the drawers should be indicated by an indicator and also by the position of the front
plate of the drawer.
The spare unit will not be equipped, as the switchboard will be designed to allow it to be upgraded easily and
therefore does not require spare feeders to be pre-fitted.
1.5 Installation, maintenance and upgradeability
The panelbuider will be located near enough to be able to supply the personnel and parts required for any
operation. The manufacturer will provide appropriate procedures and, if applicable, logistical assistance.
The manufacturer undertakes to provide spare parts with a service life of 10 years from the end-of-marketing
date.
Last update : 2017-06-29
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Specification for Tender
565323971
2. Seismic features
If the switchboard is to be used in a seismic area, the supplier will be informed of the specific acceleration
levels required. The supplier will determine the switchboard configuration that is appropriate to the stresses
involved. The test certificates will be supplied with the switchboard and refer to IEC, IBC or Nuclear
HN20E53 standards.
3. Corrosive atmosphere features
The supplier will be informed of any pollutants (e.g. SO2, H2S) that may be present on the site and must
provide appropriate coating for the conductors (busbars, connections) and metal elements (mechanisms,
frames, casing).The supplier will specify the deratings to be made, depending on the types of coatings used
on the conductive parts.
The surface of the copper parts will be treated to guard against the effects of corrosion.
The bolted connections will be coated with 30 microns of tin. All friction contact connections will be coated
with 20 microns of nickel, to prevent wear and tear due to friction.
The level of protection of the switchboard will be in conformance with IEC 721-3-3.
4. Internal arc features
The switchboard will be designed to minimize the risks associated with the propagation of an "internal
arcing" fault. It will be in conformance with the requirements of the IEC1641 technical report and AS3439-1
relative to the protection of operators and equipment.
5. Marine features
The switchboard will conform to the DNV (DET Norsk Veritas) Marine specifications. Vibration withstand
test certificates will be provided. The switchboard will be fitted with the safety accessories recommended for
embedded devices and will have a degree of protection of at least IP22. It will satisfy the main standards
relative to electrical installations in ships (IEC 92 series).
The derating tables to be applied will be those intended for an ambient temperature of 45°C.
6. Project-specific requirements
6.1 Environmental conditions
Altitude:
 =< 2000 m
 > 2000 m
Average ambient temperature around the switchboard over a period of 24 h:
Relative humidity: 80% at 35°C
Column heating:
 with
 without
Climatic environment:
T1: temperate climate
T2: all climates
T3: corrosive atmosphere
Last update : 2017-06-29
35°C
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Specification for Tender
565323971
6.2 Network electrical data
Rated voltage:
Rated power:
Rated current:
Rated frequency:
Number of sources:
Short-circuit current:
V
KVA
A
Hz
parallel yes/no
KA RMS 1S
Neutral system:
directly earthed neutral
isolated neutral
connection to neutral
TT
IT
TNC
TNS
distributed neutral
non-distributed neutral






6.3 Switchboard electrical data
Rated current In of the main busbar:
Rated short-circuit current Icw :
 50 KA
 85 KA
 100 KA
Switchboard mechanical data:
Degree of protection IP:
 22  31  42  54
Degree of protection against mechanical impact Ik:
10
Service rating IS (111, 211, 223, 231, 232, 331, 332)
Incomer =
Or type of FU electrical connection (F, D, W):
Incomer =
Forms:
2b


3b


4b


Feeder =
Feeder =
6.4 Connections
Incomer connections:
Feeder connections:
top
bottom
top
bottom
Access to the connections:




 Front
 Rear
6.5 Cross-section of auxiliary cables
Black wire without isolated end-piece 1000 V and cross-section:
1mm² for control and signalling circuits
1.5 mm² for voltage circuits
2.5 mm² for current circuits
Last update : 2017-06-29
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Specification for Tender
565323971
6.6 Switchgear assembly
Number and rating of incomers:
Number and rating of feeders:
Or refer to the single-line diagram ref.:
Last update : 2017-06-29
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