Modular medium-voltage switchgear
NorMax®
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NorMax • MODULAR MEDIUM-VOLTAGE SWITCHGEAR
2
NorMax
Modular medium-voltage switchgear
Contents SubjectPage
Table of contents2
Introduction and main features 2
Technical specification 3
Structure of NorMax
4
Main components5
Load-break switch cubicle MaxLo
6
Fused load-break switch cubicle MaxFu
7
Circuit breaker cubicle MaxBr
8
Measurements cubicle MaxMe
9
Measurements cubicle with earthing switch
MaxMe/E10
Cabling cubicle MaxCa11
Introduction and main features
Versatile and safe technical solutions
Norelco NorMax is modular switchgear for 12 and 24kV voltage levels. NorMax has been type- tested to
provide versatile and safe secondary distribution. NorMax is a perfect choice for secondary substations for
various use, e.g. commercial buildings and CSS. For more heavier use we recommend using Norelco NorMega
12 and 24kV switchgears.
NorMax switchgear consists of different modules.
NorMax MODULES AND DIMENSIONS
Module
Type
Load-break switch
Fused load-break switch
Circuit breaker
Measurement
Measurement with earthing
switch
Cabling
MaxLo
MaxFu
MaxBr
MaxMe
MaxMe/E
MaxCa
Dimensions
Width mm
500
500
750
750
Height mm
1800
1800
1800
1800
Depth mm
1100
1100
1100
1100
Weight kg
225
225
380
355
750
500
1800
1800
1100
1100
370
115
NorMax is an environmentally friendly switchgear with minimized amount of SF6-gas. Thermal-imaging for cable
connections is optionally available. NorMax has top-notch usability and low overall costs for its entire life cycle.
NorMax • MODULAR MEDIUM-VOLTAGE SWITCHGEAR
3
Easy installation with low costs
Installation of NorMax-switchgear is easy thanks to minimum cubicle width of 500mm. NorMax has several
advantages when customer wants to reduce overall costs of medium voltage switchgear:
• no expensive angled cable termination needed, only odinary indoor cable termination is required
• load switch cubicle has room for surge protectors, no need for special cable termination
• components and cubicles are individually replaceable, no need to replace whole switchgear
Quick and secure investment
Norelco has standard NorMax modules on stock and NorMax can be delivered in short notice. Customized
modules are manufactured upon request at Norelco’s factory. Norelco offers extensive product support and
service. Norelco can also take care of installation of NorMax switchgear if needed.
Technical specification
Type-approved switchgear with confidence
NorMax has been tested in conformity with Finnish and international standards. Norelco takes part SGS
Fimko’s quality- auditions to ensure quality in type-tested switchgears and in manufacturing process.
Technical specification of NorMax switchgear:
TECHNICAL SPECS
Type
NorMax 12 / NorMax 24
Rated frequence fr
50 / 60 Hz
Rated voltage Ur
12 / 24 kV
Rated current Ir
630A
Rated power-frequency withstand voltage Ud
28 / 50 kV (1min)
Rated lightning impulse withstand voltage Up
75 /125 kV
Rated short-circuit withstand current Ik
20 kA / 1s
Rated peak withstand current Ip
50kA
Internal arc fault class IAC
AFL 16 kA/ 1s
Protection against electric shock
Protective earthing
Partition class
Metal-Clad / PM
Use category
LSC2
Degree of protection
IP 20 C
Ambient temperature
-25 … +40 C
NorMax • MODULAR MEDIUM-VOLTAGE SWITCHGEAR
Structure of NorMax
Cubicle type switchgear with partitions
NorMax is a cubicle type switchgear that has partitions separated with metal sheets. The partitions are
divided into 4 different types:
1.. Busbar compartment
• air-insulated space in the top part of the switchgear
• busbar stretches to every cubicle
2. Load switch compartment
• SF6-gas insulated load switch that has 3 positions: on, off and earthed
• gas pressure indicator located on the front panel
3. Cabling compartment
• generous space for cable termination
• spare space for accessories e.g. surge protectors
• mechanically locked door when cubicle is energized
• bottom plate with pass-through holes for cables
• cabling compartment and its door form the lower partition
4. Low-voltage compartment
• contains all monitoring relays and auxiliary components
• optionally contains terminals for control and alarm contacts and tripping coil terminals
• low-voltage and busbar compartments form the upper partition
Picture:
switch
NorMax with one fused load switch, two load switches and measuring cubicle with earthing
4
NorMax • MODULAR MEDIUM-VOLTAGE SWITCHGEAR
5
Easy-to-use control panel
NorMax has a control panel that is very easy and intuitive to operate even if
the user is not yet familiar with NorMax. The user operations are done only
with one lever that is used to operate load-break switch and earthing switch. All user
errors and dangerous functions are prevented mechanically. Also the cabling
compartment door is mechanically locked when the live voltage is present.
The locking mechanism itself has a place for a pad-lock to make switchboard
safe during maintenance. On and Off -operations of load-break switch are
done via push buttons. Loadbreak switch and circuit breaker cubicles have fixed
voltage indicators as standard.
Busbars
Control panel is intuitive and prevents
any dangerous actions.
Busbars between load-break switches are made of round aluminium tube to
minimize risk of short circuit. Cable and measuring cubicles have busbars made of copper. Earthing busbar
is always made of copper.
Structural components
Cubicle frame is made of hot-zinc steel plates that have strong coat of zinc (275g/m2). Surface treatment
is made with powder coating paint. Switchgear has detachable bottom plates that can be removed during
cable installation. Optionally NorMax can be ordered with detachable pedestal fronts.
Main components
Load-break switch makes it all
All cubicles are based on load-break switch. It is SF6-gas insulated load-break switch that
has three positions (on, off, earthed). Load-break switch is always equipped with gas
pressure indicator that is located on the front panel.
Fused load-break switch gives protection to equipment and users
Fused load-break switch has holders for medium voltage fuses. Overcurrent blows the fuse
and causes the load-break switch to trip. The fused load-break switch is equipped with two
earthing switches that ground both sides of the fuse. Changing the fuse is therefore always
safe for user.
Circuit breaker enables versatile supervision and protection
NorMax switchgear uses maintenance-free vacuum circuit breaker that is capable of
working at low ambient temperatures (as low as -40 degrees in Celsius). Alternatively also
other circuit breakers (vacuum or SF6) can be fitted into the circuit breaker cubicle. Norelco
uses reliable overcurrent, short circuit and earth fault current relay protection. Alternative
relay according customer needs can be fitted.
Maintenance-free vacuum
circuit breaker is capable
of working at low ambient
temperatures.
NorMax • MODULAR MEDIUM-VOLTAGE SWITCHGEAR
Load-break switch cubicle MaxLo
Load-break switch cubicle is used as an incoming, ring main or branch unit. The
cubicle has SF6-gas insulated load switch with its control device. The main
busbar is air-insulated. To avoid any user error, the switch can only be in one
position: open, closed or earthed. The switch must be in earthed-position in
order to gain access to cabling compartment. All positions are indicated on the
front control panel.
The usage of the load-break switch is simple and all user errors have been prevented mechanically. All control functions are done with a single lever.
The basic structure of the cubicle enables revisions and component change.
Standard equipment
Upper compartment:
• SF6-gas insulated load-break switch with
3 positions
• control device with mechanical position indicators
• metal-enclosed main busbar
• integrated low voltage compartment with door
• locking mechanism
• fixed voltage indicator L1-L3
• SF6-gas pressure indicator
Lower compartment:
• metal-enclosed cabling compartment with
mechanically locked door
• bottom plate with pass-through holes for cables
• earthing busbar
Optional equipment
• auxiliary contacts for open (2no+2nc) and closed
(2no+2nc) position
• arc-pressure release channel
• air insulated surge protectors
• short-circuit indicator with indication
• spring charge motor
• SF6-gas pressure indicator with auxiliary contacts
6
NorMax • MODULAR MEDIUM-VOLTAGE SWITCHGEAR
Fused load-break switch cubicle MaxFu
Fused load-break switch cubicle is used as transformer feeder or protection. The
cubicle has SF6-gas insulated load switch and separate earthing switch with
control device. The main busbar is air-insulated. The fused load-break switch is
equipped with two earthing switches that ground both sides of the fuse.
Changing the fuse is therefore always safe for user. If overcurrent blows one
fuse, it opens all load-break switch contacts (3 phases). To avoid any user error,
the switch can only be in one position: open, closed or earthed. The switch must
be in earthed-position in order to gain access to cabling compartment.
All positions are indicated on the front control panel.
The usage of the load-break switch is simple and all user errors have been
prevented mechanically. All control functions are done with a single lever.
The basic structure of the cubicle enables revisions and component change.
Standard equipment
Upper compartment:
• SF6-gas insulated fused load-break switch with 3
positions
• control device with mechanical position indicators
• metal-enclosed main busbar
• integrated low voltage compartment with door
• Locking mechanism
• fixed voltage indicator L1-L3
• SF6-gas pressure indicator
Lower compartment:
• earthing switch
• metal enclosed cabling compartment with
mechanically locked door
• bottom plate with pass-through holes for cables
• earthing busbar
Optional equipment
• auxiliary contacts for open (2no+2nc) and closed
(2no+2nc) position
• auxiliary contacts for blown fuse (1no+1nc)
• arc-pressure release channel
• SF6-gas pressure indicator with auxiliary contacts
7
NorMax • MODULAR MEDIUM-VOLTAGE SWITCHGEAR
Circuit breaker cubicle MaxBr
Circuit breaker cubicle is used for switching and protection in distribution, and for
motors, transformers and capasitors. Cubicle is equipped with a fixed vacuum or SF6-gas
insulated circuit breaker with its protection relay. The cubicle has also SF6-gas insulated
load switch and separate earthing switch with control device. The load-break switch is
between main busbar and the circuit breaker. The main busbar is air-insulated. To avoid
any error, the switch can only be in one position: open, closed or earthed. The loadbreak switch must be in earthed-position in order to gain access to circuit breaker
compartment. All positions are indicated on the front control panel.
The usage of the load-break switch and the circuit breaker is simple and all user errors
have been prevented mechanically. All control functions are done with a single lever .
The basic structure of the cubicle enables revisions and component change.
Standard equipment
Standard equipment
Upper compartment:
• SF6-insulated load-break switch with 3 positions
• control device with mechanical position indicators
• metal-enclosed main busbar
• integrated low voltage compartment with door
• locking mechanism
• fixed voltage indicator L1-L3
• SF6-gas pressure indicator
• protection relay
Lower compartment:
• circuit breaker
• cable current transformer
• earthing switch
• metal-enclosed cabling compartment with
mechanically locked door
• bottom plate with pass-through holes for cables
• earthing busbar
Optional equipment
• auxiliary contacts for open (2no+2nc) and closed
(2no+2nc) position
• arc-pressure release channel
• spring charge motor
• SF6-gas pressure indicator with auxiliary contacts
8
NorMax • MODULAR MEDIUM-VOLTAGE SWITCHGEAR
Measuring cubicle MaxMe
Measuring cubicle is used for medium-voltage measurement. The cubicle has
very versatile construction that can be adapted to customer’s needs. MaxMe is the
basic model for measuring without earthing switch.
The MaxMe cubicle can be equipped with voltage and current transformers.
The main busbar for measuring cubicle is customized for every order. The basic
structure of the cubicle enables revisions and component change. User actions
and maintenance tasks are easily taken care of in spacious measuring cubicle.
Standard equipment
• main busbar
• lower compartment with pad-lockable door
• integrated low voltage compartment with door
• pass-through holes for busbar
• earthing points
• terminal blocks and fuses for secondary measurement
• space for transformers
• earthing busbar
Optional equipment
• fixed voltage indicator L1-L3
• arc-pressure release channel
• current transformers
• voltage transformers with ferro-resonance damping
resistance
9
NorMax • MODULAR MEDIUM-VOLTAGE SWITCHGEAR
Measuring cubicle MaxMe/E
Measuring cubicle is used for medium-voltage measurement. The cubicle has
very versatile construction that can be adapted to customer’s needs. MaxMe/E is
always equipped with earthing switch.
The MaxMe/E cubicle can be equipped with voltage and current transformers.
The main busbar for measuring cubicle is customized for every order. The basic
structure of the cubicle enables revisions and component change. User actions
and maintenance tasks are easily taken care of in spacious measuring cubicle.
Standard equipment
• main busbar
• air-insulated earthing switch
• lower compartment with pad-lockable door
• integrated low voltage compartment with door
• pass-through holes for busbar
• terminal blocks and fuses for secondary measurement
• space for transformers
• earthing busbar
Optional equipment
• fixed voltage indicator L1-L3
• arc-pressure release channel
• current transformers
• voltage transformers with ferro-resonance damping
resistance
10
NorMax • MODULAR MEDIUM-VOLTAGE SWITCHGEAR
Cabling cubicle MaxCa
Cabling cubicle is used when the direct cable connection to the main busbar
is needed. The MaxCa cubicle is placed as the first or the last cubicle of the
switchgear. The cubicle has connection point for incoming cabling.
The cabling compartment door can only be opened with a tool. The cubicle has
also connection point for earthing. The MaxCa has space for accessories like
surge protectors.
Standard equipment
Upper compartment:
• main busbar
• integrated low voltage compartment with door
• pass-through holes for busbar
• earthing points
Lower compartment:
• metal-enclosed cabling compartment with
mechanically locked door
• option to connect parallel incoming cables
• bottom plate with pass-through holes for cables
• earthing busbar
Optional equipment
• fixed voltage indicator L1-L3
• arc-pressure release channel
• air-insulated surge protectors
• short-circuit indicator with visual indication
11
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Norelco Oy, PO.Box 28, FI-57201 SAVONLINNA, Finland | tel. +358 (0) 15 57 67 70, fax. +358 (0) 15 57 67 710
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