medium voltage ce-b metal clad switchboards · medium voltage ce-b metal clad switchboards...
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CE - B - C - en - REV.02 2011.8
MEDIUM VOLTAGE CE-B METAL CLAD
SWITCHBOARDS
CE - B - C - en - REV.02 2011.8 32
MEDIUM VOLTAGE CE-B METAL CLADSWITCHBOARDS
AP
PLI
CAT
ION
STA
ND
AR
D
CE-B Metal Clad switchboards
are designed for use in public
and industrial distribution system
up to 24kV for the operation and
protection of lines, generators,
transformers, motors, capacitor
banks. The switchboards are
composed combining the various
typical standard cubicles.
CEI 17-6 Italian standard
IEC 62271-200 International standard
IEC 60-298 (replaced by IEC 62271-200)
DPR 547 Italian accident prevention Standard
IEC 60129 Earthing switches
IEC 60694 High voltage switchgear
IEC 62271 Circuit breakers
These switchboards have performed all relevant
tests carried out by qualifi ed laboratories.
Utilities and Power Plants• Power Stations
• Generator switchgear
• Transformer stations
• Main and auxiliary switchboards
Industry• Metallurgy
• Pulp and Paper
• Cement
• Chemical
• Rolling mills
• Automotive
• Petrochemical
• Oil and gas
Marine applications• Drilling platforms
• Off-shore oil rigs
• Ferries and ships
Services• Hospitals
• Infrastructures
• Data center
Transports• Airports
• Ports
• Railways
TY
PIC
AL
US
ES
The company is qualifi ed to supply standard ENEL type units.
MEDIUM VOLTAGE CE-B METAL CLADSWITCHBOARDS
CE - B - C - en - REV.02 2011.8
General CharacteristicsAccording to the international standard IEC 62271-200
the CE-B switchboards are classifi ed for “loss of service
continuity category” as LSC2B with partition class PM
(Metallic Partitions).
The optional version CE-BA is also foreseen fully withstanding
to internal arc fault:
• Internal arc classifi cation (IAC)
• Accessibility type:
A (restricted to authorized personnel only)
F (Front)
L (Lateral)
R ( Rear)
Mechanical characteristicsEnclosure: Under normal operation the degree of protection
is of IP 31 for metal enclosure and IP2X in the LV instrument
compartment.
The individual structures are made of die-bended galvanized
sheet steel elements of no less than 2 mm thickness.
The external coloured panels are realized with carbon steel
painted with electrostatic epoxy powder, the standard
colour is light grey RAL 7035 smooth (all RAL scale colours
or specifi c colours can be realized on request). Standard
painting minimum thickness of 60 +/- 10 microns is
guaranteed.
Structure: all structural parts are solidly fastened together by
special screws ensuring a good electrical contact between
the connected parts.
Nuts and bolts used to assemble structure and enclosure
are galvanized and passivated with minimum thickness of
12 microns.
Earthing Circuit-breaker: earthing of circuit-breaker is ensured on
the whole isolating stroke by means of a sliding jaw type
contact on the copper conductor which is directly connected
with the earthing bus-bar.
Components: all main components such as CTs, VTs, etc.,
are positively earthed.
Doors: are connected to the frame by a 25 mmq. cross
section fl exible braids.
Earthing bus-bar: the earthing bus-bar in copper with a
normal 350 mmq. cross section runs along the length of the
switchboard, thus ensuring maximum safety for personnel
and equipment.
Access and limited overall dimensions: the overall dimensions are particularly restricted if compared
with the high performances achieved for the insulation level,
rated busbars current and short-circuit current.
Optionally only front access could be required for installation
and maintenance.
Versatility and fl exibility: any single line
diagram can be realized to meet the most varied technical
requirements. Special and customized adaptation units allow
easy extension of existing switchboards even from supplied
by other suppliers or not jet in production.
Maximum service reliability: reinforced
insulation of all live parts minimizes the occurrence of faults
between phases or to earth. The various compartments of
each cubicle are fully segregated and can, besides, be simply
and rapidly inspected. As a matter of fact, equipment such as
circuit-breakers, instrument transformers and terminals are
readily accessible for inspection and maintenance purposes.
Easy inspection and maintenance: through easy access to the equipment in the various
compartments by hinged doors or removable bolted panels
and through the isolation and withdrawal on truck of circuit-
breakers, VT, fuses.
Easy installation and connection: the
cubicles are factory assembled and tested before being
shipped to site, therefore they only need to be secured to
the fl oor, coupled together and connected to the external
circuits.
Personnel safety ensured by:
• positive earthing on the entire switchboard structure
• earthing of circuit-breaker frame throughout racking-in or
withdrawing operations;
• metal shutters automatically operated during circuit
breaker truck movement;
• metal shutters automatically operated during VTs truck
movement;
• insulating protections and coatings are available for live
parts;
• easy access to low voltage apparatus and control wirings
without any risk of accidental contact with medium voltage
parts;
• set of mechanical and electromechanical interlocks;
• various signalling and control devices.
No fi re risk: metal partitions of compartments and use
of self-estinguishing insulating material prevent fi res from
spreading.
Standard routine factory tests:• Visual inspection and check.
• Mechanical sequence operations.
• Cabling check.
• Electrical sequence operations.
• Insulation test.
FEATURES
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MEDIUM VOLTAGE CE-B METAL CLADSWITCHBOARDS
CE - B - C - en - REV.02 2011.8
Rated voltage kV 12 17,5 24
Rated power frequency withstand voltage (1min) kV 28 38 50
Rated lightning impulse withstand voltage kV 75 95 125
Rated frequency Hz 50/60 50/60 50/60
Rated short-time withstand current (3 sec) kA 50 50 40
Peak current kA 125 125 100
Internal arc withstand current IAC-FLR (1sec)* kA 50 50 40
Rated current max. A 3150 3150 2500
Rated current with forced ventilation ** max. A 4000 4000 4000
Rated current with two breakers in parallel ** max. A 5000 5000 4000
Rated voltage 12KV 17,5KV 24KV
Depth (mm) 1625 1860 2060
Height (mm) 2325 2325 2325
Height (mm) - IAC 2780 2780 2780
Width (mm) 600 800 1000 800 1000 800 1000
Rated current up to (A) 630 1600 4000 1600 4000 1600 2500
DIMENSIONS
Note * Internal arc withstanding in option ** Type tested
TECHNICAL DATA
Electrical Data
Maximum ambient temperature C° +40
Minimum ambient temperature C° -5
Height m a.s.l. ≤ 1000
Maximum relative humidity % 95
For different conditions contact our offi ces. Dimensions could be affected by specifi c equipment and confi guration.
Normal Service Conditions
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MEDIUM VOLTAGE CE-B METAL CLADSWITCHBOARDS
CE - B - C - en - REV.02 2011.8
Typical composition:
A Instrument compartmentAll the low voltage equipment can be housed in the instrument
compartment, which is usually placed above the circuit-
breaker compartment
B Circuit-breaker compartmentThis compartment is designed to accommodate the circuit-
breaker, contactor or link complete of its withdrawable truck
and all mechanical parts required for the extraction.
The device is provided with auxiliary switches for signalling
the “connected position” and “disconnected/test position”.
C Feeder compartmentThe feeder compartment, accessible from the rear of the
cubicle by removing the panel or by opening the eventual
door.
CONSTRUCTION SAFETY INTERLOCKS
Earthing switch• Mechanical lock to prevent the earthing switch closing if the
circuit-breaker is in connected position
On the circuit-breaker• Mechanical lock to prevent the connection or disconnection
of the circuit breaker when closed
• Mechanical lock to prevent the circuit breaker connection
when the earthing switch is in closed position
• Mechanical lock to prevent the disconnection of auxiliary
connector with circuit breaker in connected position
• Mechanical lock to prevent the manual opening of the
shutters when the circuit breaker is removed from the
compartment. The shutters can only be operated by the
circuit breaker truck.
• Mechanical protection (IP20) form live parts even with door
open is always maintained with circuit breaker in connected
and disconnected position.
On the VT’s compartment (if present)• Mechanical lock to prevent opening of the door when VTs
are in connected position.
• Mechanical lock to prevent the manual opening of the
shutters when the VTs are removed from the compartment.
The shutters can only be operated by the VTs truck.
D Busbar compartmentThis compartment contains the main bus-bars which are
directly supported by the lower fi xed isolating contacts of the
circuit-breakers and isolator supports fi xed on the structure.
E Wiring duct for interconnectionsOn the cubicle roof front side, a wiring duct is provided to hold the
auxiliary connections between the various cubicles and towards
the external installation.
F Voltage transformer compartment (VT compartment)This compartment can contains the fi xed or draw-out version
voltage transformers and the related fuses
The draw-out version allows VTs and fuses replacement in
safe conditions even with switchbord on voltage.
This compartment can be located in incoming or outgoing
feeder cubicles as well as in bus tie cubicles.
The device could be provided with auxiliary switches for
signalling the “racking-in” and “racked-out position.
G Earthing switchThe unit can be equipped with Casagrande Elettrocostruzioni
“CE-SEZ” earthing switch. The switch is activated with an high
speed rotating snap, sized to conduct the rated short circuit
making current when close to under load. The speed of the
snap action closing operation is independent of controls.
A manual switch operating lever is provided on the front of the
switchbord.
The device is provided with auxiliary switches for signalling the
open and closed positions.
H Gas exhaust duct (Optional)The gas exhaust duct, positioned on the top of the cubicles,
collects and ejects outside the safety area the gas resulting by
the eventual internal arc fault.
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MEDIUM VOLTAGE CE-B METAL CLADSWITCHBOARDS
CE - B - C - en - REV.02 2011.8
VERSIONS AND CONFIGURATIONS
TYPICAL UNITS
Special VersionsEnvironment
• For special environments and temperature
• For indoor use with protection degree up to IP54
• For outdoor use in metal box up to IP56 or NEMA 4X
Connection
• Incoming/outgoing by cables form the TOP
• Incoming/outgoing by bus duct form the TOP
Options and accessoriesAvailable Locks
• Key locks permitting the key to be released with Circuit
Breaker locked in open positions
• Key locks permitting the key to be released with Circuit
Breaker locked in disconnected position
• Key locks permitting the key to be released with circuit
breaker door closed
• Key lock permitting the key to be released with earthing
switch closed and locked in closed position
• Key lock permitting the key to be released with earthing
switch open and locked in open position
• Electromechanical lock to prevent closing of earthing switch
• Mechanical lock to allow door opening only if circuit breaker
is in disconnected position
• Padlock facility on circuit breaker shutters in closed position
• Padlock facility to prevent circuit breaker connecting or
disconnecting movement
• Padlock facility to prevent opening or closing of earthing
switch
• Padlock facility on circuit breaker door
Command
• Motorized command for draw-out / draw-in circuit breaker
trolley
• Motorized command for earthing switch
Accessories
• Light or pressure device to limit internal arc fault duration
• Circuit breaker trolley for handling when removed from the
compartment
• Contactor trolley for handling when removed from the
compartment
• Handle for circuit breaker / contactor connecting or
disconnecting movement
• Handle for earthng switch command
Eart
hing
Eart
hing
Eart
hing
Optional
Example of confi guration
1110
MEDIUM VOLTAGE CE-B METAL CLADSWITCHBOARDS
Headquarters and Factory:
via G. Rossini, 24
37060 Castel d’Azzano
(Verona) Italy
Tel. +39 045 8546511
Fax +39 045 8520214
E-mail: [email protected]
Production Branch:
Contrada Piana Z.I.
86019 Vinchiaturo
(Campobasso) Italy
Tel. +39 0874 340225
Faz +39 0874 340227
www.casagrande.vr.it