ELEKTROTEHNI KO PODJETJE Leskoπkova cesta 12, 1000 Ljubljana, SLOVENIA

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1 MRO Modularne Razdelilne Omare d.o.o. ELEKTROTEHNI KO PODJETJE Leskoπkova cesta 2, 000 Ljubljana, LOVENIA

2 MC GENERAL When to use? MC - modular switchgear cabinets are type-tested, factory built switchgears, designed for all sorts of low voltage power distribution, e.g.: main low voltage switchboards in transformer stations, diverse power distribution cabinets in industry, low voltage power distribution in transformer stations (for personal use), main distribution cabinets in business facilities. Basic technical features The construction of the MC switchgears is based on factory-built and standardised components and switch modules, which can be assembled into the switchgear of a desired capacity. In this way it is achieved that each configuration of the MC switchgear, which is adapted to the single project, is technically ideal and in accordance with valid regulations and standards. But such an assembling method has also some other benefits: all technical solutions used in MC switchgears are based on experiences from the field of construction, manufacture, assembly and operation in different working conditions; high operating reliability, as only standardised and type-tested elements are being used; guaranteed personnel safety during switch use in all working conditions; easy maintenance and repair without special tools; ideal space utilization on site of operation; possibility of alterations and upgrading of MC switchgears which are already in operation. 2

3 MC TECHNICAL DATA Technical data: Rated operational voltage: 45 V, AC - power circuit 230 V, AC - control circuits Rated frequency: Rated insulation voltage: 50 Hz 690 V, AC Pollution degree: 3 Rated current: Rated short-time withstand current Icw: Rated impulse withstand current Ipk: Conductor material: Cabinet dimensions: 3200 A main busbars 2500 A auxiliary busbars up to 65 ka up to 30 ka copper Height: 2200 mm Depth: 400 mm ( In 630 A) 600 mm (In 2500 A) 800 mm (In 3200 A) Width: 400, 625, 800, 000, 200, 400 mm (basic dimensional unit is 25 mm = E) witchboard cooling: Anti-corrosion protection: natural airing Galvanized sheet steel (supporting frame and metal bearers). (Powder coating in RAL 7032 (casing, doors, outer covers)) Mechanical protection IP (IEC 529): Internal separation (IEC 439-): Operating requirements on site of operation: IP 3 - standard IP 54 - on order FORM 2b (busbar compartment is separated from the switch and cable compartments) FORM 3b (busbar compartment is separated from the switch and cable compartments, each switch compartment is individually separated) FORM 4b (busbar compartment is separated from the switch and cable compartments, each switch compartment and each cable compartment is individually separated) Closed sites, height above sea level 000 m Average 24-hour temperature: +35 C Max. temperature: +40 C Min. temperature: -5 C Relative humidity: up to 50% at 40 C For the prevention of condensation, anti-condensation heaters have to be installed (e.g. tropical climate). tandards: IT EN , DIN VDE 0660 Part 500, IEC 439-3

4 MC CONTRUCTION, FORM Construction MC - switchgears are designed to enable the use of simple and complex switchgear versions on one uniform supporting frame. The switchgear cabinet is divided into three compartments: busbar compartment (at the back, at the top), switch compartment with one or more doors, cable compartment which can either be in the upper or lower part or at the back. switch compartment cable compartment busbar compartment Internal separation The basic version offers the FORM 2b which can be upgraded to FORM 4b. The internal separation of the switchgear cabinet provides the following: metal partition walls which separate main busbars from other functional compartments; they provide reliable protection against direct contacts with live parts and protect the equipment from electric arcs due to short circuits on the main busbars; the separation of each functional compartment even more limits the damage in case of dangerous situations, as the electric arc cannot jump to another compartment; as a result, such kind of switchgear "survives" also critical situations without major damage of vital parts; the separation makes it possible to perform minor works in the switch compartment while the switchgear is in operation, e.g.: the connection of new or replacement of old output cables, protection devices, measuring equipment testing and modification of control circuits; as a result, the emergency shut-downs are reduced to a minimum; 4

5 MC CONTRUCTION, FORM To sum up, the more detailed the separation, the better the operation reliability and fewer emergency shut-downs occur. What is more, the protection and safety of the personnel is in this case the highest! Form 2b Legend: WITCH - ingoing/outgoing connections 2 - main busbars - auxiliary busbars Form 3a Form 3b Form 4a Form 4b 5

6 MC WITCH MODULE Technical description: witch modules are divided into: outgoing modules, ingoing modules, control modules. All switch modules are to be connected directly to the main or auxiliary busbars with a screw joint. When connecting, the switchgear has to be in a voltage free state. In case of replacing switch equipment, there is no need to intervene into the busbar compartment This simplifies the procedure and is extremely time-saving. The size of the modules depends on the rated current of the installed equipment. It is always a multiple value of the basic unit E = 25 mm. In this way, compatibility and easy assembly with simple tools are guaranteed. The module can be equipped with the following: low voltage circuit breaker, protection switch, motor protecting switch with contactor. On demand, the following equipment is attached: current measuring transformers, ammeter, voltmeter, network analyzer, power energy counter, motor drives, positioning lights, 6

7 MC CONTRUCTION, FORM remote control kit, keys, pilot lights, switches. The metal construction frame of switch modules is identical in all versions and can be upgraded depending on the scope of equipment and internal separation. Connecting the cables In the basic version, the output switches are to be connected directly to the switchgear equipment. On request, connecting clamps may be attached. Ingoing modules are always connected via copper busbars, which are adjusted to the cable connection or to the compact busbar system connection. If the cable compartment is located at the side, the outgoing switch modules can be connected from the top, bottom or side. Larger modules are located at the bottom of the switchgear cabinet and smaller modules are located in the upper part. Ingoing switch modules can be connected at the top or bottom. 7

8 EDITION 9/2004 d.o.o. ELEKTROTEHNI KO PODJETJE Leskoπkova cesta 2, 000 Ljubljana, lovenija Tel.: 0 / , Fax: 0 / , GM.: 03/ , 04/ enerprom@siol.net,