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innovativevalue

proactivevalue

responsiblevalue

activate value

adaptablevalue

resourceful value

communicative value

intelligent value

MDY Busduct System

A reliable and safe solution for power transmissionfrom the transformer to switchgear andbetween switchgear sections

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MDY Busduct Application Versatility

The MDY busduct system is the ABB solution for power transmission from the transformerto low-voltage switchgear and between switchgear sections.

From the point of view of the transmission reliability, a busduct is the safest solution forconducting current from a distribution transformer to a main switchgear and motor control board.

The MDY busduct is manufactured from insulated conducting bars, which can be made ofaluminium or copper. Thanks to its construction, the busduct is rigid and its short-circuitresistance is in a class of its own from the transformer terminals up to the main switchingdevice terminals of the switchgear. In addition to full phase separation, the MDY busduct canalso be protected from rain and mechanical damage using an additional enclosure. Even with itsopen construction, the insulated busduct can be used in demanding environments.

The MDY busduct is manufactured in transport units which enable quick and easy installationand connecting even in narrow places. It can be connected to existing switchgear, and also

joined to different manufacturers busducts. Each MDY busduct system is designed individuallyon order to ensure an optimal solution for our customers.

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Busbar material

The MDY busbar material is aluminium orcopper, but can also be tin-coated copper.

The insulating plastic coating is extruded ontothe bars. The insulation fastens tightly ontothe busbar surface, which guarantees anexcellent current-carrying capacity of thebusduct. The insulation allows the busbarsto be bent.

Busbar bushings and

mechanical protection

(wall, roof and floor bushings)

The fire insulation between compartmentsis implemented using bushings, which fulfilfire separation class EI-M 60 or EI-M 120according to the fire-safety regulations forproduction and storage buildings.

The fire-insulation bushings can also bemade gas-proof.

Flexible busduct connections

The busduct is connected to a transformerusing flexible connections which negate theeffects of thermal expansion and vibrations.Long busducts (>20 m) are provided withlongitudinal expanding connections toattenuate the thermal expansion.

The connections are pre-installed onthe busduct at the factory.

Other equipment

- busbar sectionalizer switch- electromagnetic screening- current transformer housing- mechanical protection of busbar- protection against insects- gas-proof fire-insulation bushings

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MDY Technical Data

Rated voltage Ue.................................................. 400 ... 690 V

(tested 1000 V AC / 1500 V DC, 3/N/PE)

Rated current Ie...................................................1200 ... 5500 A

Short-circuit withstand current

- short-time withstand current Icw

.........max. 100 kA, 1s

- peak withstand current Ipk

..................max. 235 kA

Enclosure class .....................................................IP 30, IP 54, (IP 65)

Frame sizes

A busbar width of 400 mm is also possible up to a rating of 2150 A using aluminium bars and up to 2700 A

using copper bars. The number of phase bars is determined by the rated current and service conditions.

Bushing sizes

Current values

Ambient temperature +35 C, IP 30

Al

1300

2500

2800

3500

4000

Cu

1900

3200

3500

4300

4900

6000

mm

600

600

600

800

800

1000

Current Width Weight, kg

Al

30

40

50

70

100

Cu

55

80

105

125

150

180

Framesize

400

600

800

1000

Wall, roof and floorbushings

Wall bushing Roof bushing Floor bushing

Distance of bushing center point of openingmm

fromthe switchgear

roof

300

300

380

380

from the centerof switchgear

front edge

300

300

300

300

from the centerof switchgear

front edge

300

300

300

300

Widthmm

500

700

900

1100

Heightmm

260

260

260

260

400 600

800

1000

163

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MCS Standard Boards

Area lighting and multi-meter boards, capacitor banks, starters, boxes and site boards.

Low voltage products and services everything from the same company!

MNS

Modular LV switchgear system solution for power distribution in industry, power plants,

buildings and offshore applications.

ServicesLow Voltage Systems Overall Tailor-Made Service for Your Needs.

INSUM

Switchgear control and monitoring system.

MDY

Reliable and safe busduct system between the transformer and the switchgear

or between the switchgears.

LV switchgear for marine applications

Versatile, well designed and fast onshore and offshore.

MCR

Compensation and harmonic filters.

Standard boards

Nps, MCS-boxes, MCS-starters, MCS-area lighting.

MCS

Overall solution for changing needs of power distribution, control and automation.

Modular Cabinet System

Npsplus

1TFC9

02003B0

201

ABB OyLow Voltage SystemsP.O.Box 600, FIN-65101 VAASA

Tel. +358 10 22 11Fax +358 10 22 41097www.abb.com