RAWA
The RAWA switchgears are designed for supply and distribution of three-phase alternative current electric energy at rated voltage up to 12 kV and frequency of 50 Hz in mine power networks. RAWA is also a special application switchgear, designed for operation in dusty and gassy environments.
Advantages of the RAWA switchgear:
- Unique and innovative constructional solutions,
- High resistance to electric arc,
- Various switchgear system configurations possible,
- High operational safety,
- High operating reliability,
- High resistance to corrosion,
- Ease of cable termination and connection,
- Compact overall dimensions.
The RAWA switchgear units can be operated as:
- Main distribution switchboards in underground mines,
- Sub-main switchboards in underground mines.
The RAWA switchgear units are approved by the Supreme Mining Authority (WUG) for application in underground mines with headings free of explosion hazards, including methane explosion hazards, and qualified for coal dust explosion hazard class A.
Application and features of the system
The RAWA switchgear units can be applied in underground mines with headings free of explosion hazards, including methane explosion hazards, and qualified for coal dust explosion hazard class A.
The RAWA switchgear are:
- Especially for mining industry and polluted areas
- Indoor
- With air insulation
- Metal-clad
- Internal decompression of arc gases
- Blow-out of gases limited to decompression chamber only
- Truck-mounted design with drwa-out circuit breaker
- Free standing
- Compartments separated with metallic partitions
- With single bus-bar system
- Degree of protection IP 54
- Arc-proof
- Operational safety for staff
- Modern
- Equipped with modern switching apparatus
- Type tested and approved for use in underground of mines (certificate issued by the Polish State Mining Authority)
System features:
- Each switchgear panel is provided with modern switching gear, metering, and control devices;
- Each switchgear panel equipment configuration depends on the panel function;
- The diversity of panel configurations enables the design of any system of switchgear panels;
- Each panel is compartmentalized with metal divisions;
- The structure is made of steel sheets finished by galvanizing or aluzinc coating;
- The outer guards and doors are powder-coated in project-specified colours;
- The design of switchgear fields is reinforced to provide a high internal arc discharge withstand strength.
Technical data and certificates
Technical data of RAWA switchgears
| RAWA | RAWA PRO | ||
| Rated insulation voltage | kV | 12 | 12 |
| Rated lightning impulse withstand voltage (1,2/50µ) | kV | 75/85 | 75/85 |
| Rated power frequency withstand voltage | kV | 28/32 | 28/32 |
| Rated frequency | Hz | 50 | 50 |
| Rated continuous current of busbars | A | up to 1600 | up to 1250 |
| Rated short time withstand current (3s) | kA | up to 31,5/3s | up to 25/3s |
| Rated peak withstand current | kA | up to 80 | up to 63 |
| Arc resistance | kA | 25/1s | 25/1s |
| Degree of protection | IP 54 | IP 54 | |
| IAC classification (class of resistance to internal arc) | AFLR | AFLR | |
| PM/PI classification (class of partitions) | PM | PM | |
| LSC classification (class of compartment accessibility) | LSC2B | LSC2B | |
| Busbar system | single | single | |
| Weight of single switchgear panel | kg | 350 - 900 | 350 - 850 |
| Overall dimensions (width)* | mm | 600 - 750 | 600 |
| Overall dimensions (depth)* | mm | 1300 - 1400 | 1300 |
| Overall dimensions (height)* | mm | 1800 - 1875 | 1800 |
* - without external guards, covers, doors
Certificates
- The RAWA/RAWA PRO switchgear have been approved by the Polish State Mining Authority to be used underground in mines.
- Medium voltage special application switchgear system RAWA/RAWA PRO have been approved by Electrotechnical Institute in Warsaw.
Download
Latest catalogue of RAWA MV switchgear system: