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Modular medium-voltage switchgear

NorMax®

NorMax • MODULAR MEDIUM-VOLTAGE SWITCHGEAR 2

Contents

Subject PageTable of contents 2Introduction and main features 2Technical specification 3Structure of NorMax 4Main components 5Load-break switch cubicle MaxLo 6Fused load-break switch cubicle MaxFu 7Circuit breaker cubicle MaxBr 8Measurements cubicle MaxMe 9Measurements cubicle with earthing switchMaxMe/E 10Cabling cubicle MaxCa 11

NorMaxModular medium-voltage switchgear

Versatile and safe technical solutionsNorelco 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.

Introduction and main features

NorMax MODULES AND DIMENSIONS

Module Type Dimensions

Width mm Height mm Depth mm Weight kg

Load-break switch MaxLo 500 1800 1100 225

Fused load-break switch MaxFu 500 1800 1100 225

Circuit breaker MaxBr 750 1800 1100 380

Measurement MaxMe 750 1800 1100 355

Measurement with earthing switch MaxMe/E 750 1800 1100 370

Cabling MaxCa 500 1800 1100 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.


Technical specificationType-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

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 investmentNorelco 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.


Structure of NorMax

Cubicle type switchgear with partitionsNorMax 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: NorMax with one fused load switch, two load switches and measuring cubicle with earthing switch


Easy-to-use control panelNorMax 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 usererrors and dangerous functions are prevented mechanically. Also the cablingcompartment door is mechanically locked when the live voltage is present.

The locking mechanism itself has a place for a pad-lock to make switchboardsafe 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.

BusbarsBusbars 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 componentsLoad-break switch makes it allAll 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 usersFused 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 protectionNorMax switchgear uses maintenance-free vacuum circuit breaker that is capable ofworking 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.

Control panel is intuitive and prevents any dangerous actions.

Maintenance-free vacuum circuit breaker is capable of working at low ambient temperatures.


Load-break switch cubicle MaxLoLoad-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 pre-vented mechanically. All control functions are done with a single lever.

The basic structure of the cubicle enables revisions and component change.

Standard equipmentUpper 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


Fused load-break switch cubicle MaxFuFused load-break switch cubicle is used as transformer feeder or protection. Thecubicle 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.



• 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



(2no+2nc) position• auxiliary contacts for blown fuse (1no+1nc)• arc-pressure release channel• SF6-gas pressure indicator with auxiliary contacts


Circuit breaker cubicle MaxBrCircuit breaker cubicle is used for switching and protection in distribution, and formotors, 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 load-break 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 .



• 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

Standard equipmentLower compartment:

• circuit breaker• cable current transformer• earthing switch• metal-enclosed cabling compartment with



(2no+2nc) position• arc-pressure release channel• spring charge motor• SF6-gas pressure indicator with auxiliary contacts


Measuring cubicle MaxMeMeasuring 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 measure-

ment• 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


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 measure-

ment• 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


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.


• 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

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