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ENCAPSULATION OF CONVERTER UNITS IN A CABINET

IP.com Disclosure Number: IPCOM000249813D
Publication Date: 2017-Apr-10
Document File: 9 page(s) / 298K

Publishing Venue

The IP.com Prior Art Database

Related People

Rapinoja Hanna: AUTHOR [+3]

Abstract

Novel solutions for dividing a cabinet comprising inverter units or converter units into several sub-compartments are disclosed. The cabinet is provided with a main door and the units are positioned behind hatches behind the main door. Service and/or maintenance of one unit can be done when the other units are operating.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 44% of the total text.

Page 1 of 9  FI-1616001

© Copyright [2017] ABB. All rights reserved.

ENCAPSULATION OF CONVERTER UNITS IN A CABINET

Novel solutions for dividing a cabinet comprising inverter units or converter units into several sub-

compartments are disclosed.

If several inverter units or converter units related to different functions are mounted into a common

apparatus field in a cabinet, the separation requirements of the functions are stated e.g. in

standard IEC 60439-1 Form 1-4 with sub-grades.

The novel solution makes it easier to determine whether the construction fulfills the requirements

stipulated by standards in cases where it is mandatory to meet specified requirements.

Figure 1. A traditional inverter module with one inverter.

Page 2 of 9  FI-1616001

© Copyright [2017] ABB. All rights reserved.

The left hand of figure 1 is a diagrammatic figure of the module and the right hand of

figure 1 shows a typical encapsulation construction.

The DC-bus bar goes through the cabinet. The DC is branched off from the DC-bus bar

via a main switch and fuses to the inverter module. The connections to the AC motor are

at the bottom portion of the module or directly on the inverter unit depending on the power

of the unit.

The lower portion of the door comprises an intake for cooling air provided with a grid

and/or a filter depending on the enclosure class. The door provided with a sealing extends

along the whole area of the cabinet. The exhaust air may be led out through the roof of

the cabinet or it may be led out in a channel. In a one module cabinet there is not normally

a need for a forced ventilation (a fan on the roof).

All the electrical equipment are in the same space in an encapsulation manner when the

door is open. The dangerous points are, however, protected with protections against

contact.

Page 3 of 9  FI-1616001

© Copyright [2017] ABB. All rights reserved.

Figure 2. A traditional inverter module with several inverters.

The figure 2 shows a traditional inverter with several inverter units. The common functions

are in the upper portion of the cabinet and the connections to the AC motors are at the

lower portion of the cabinet. Three inverters are provided one upon the other in the middle

portion of the cabinet.

There may arise problems if one inverter unit is taken out of function in order to do some

maintenance or repair work to said unit. If all three inverter units are in the same space

when the door is open, then maintenance or repair of one unit is considered to form a

major risk.

Page 4 of 9  FI-1616001

© Copyright [2017] ABB. All rights reserved.

This is why the inverter units must be separated from each other with an encapsulation

and also the common functions and the common apparatuses relating to the whole

cabinet must also be separated from the inverter units.

The blue lines in figure 2 show those subareas which has to be well separated from each

other so that it is safe to work in one unit in the cabinet.

Figure 3. A first embodi...