CBLABLE REPLACEMENT PROJECT AT WOOD PULP MILL

CABLE REPLACEMENT

1. CABLE REPLACEMENT PROJECT

2. BACKGROUND Existing conditions of cables Benefits of proper cabling

3. SCOPE Identifying the problems in the installation and condition of electrical cables in the pulp mill. Finding out suitable solution that can be applied to overcome the problems. Finding more simple and reliable solution ensuring all new installations rely on the standards.

4. PROBLEMS Cables Laying not following standards Main Problems No segregation between power and control cables – Both power and control cables are laying on same ladder/rack support. No segregation between HV and LV cable – High Voltage and Low Voltage cables are found laid in the same rack/ladder.

5. No proper fixing – Cables are found hanging out from the rack/ladder supports. Also, with more twist and crossovers.

6. Cables installed near to heat sources. Cables penetrating through walls without proper sealing by fire stop products. Cables change of direction through sharp edges (racks, ladders and other structures). Cables tied to the rack/ladder supports.

7. SOLUTIONS Distributing MCCs Load By Areas/Levels Load By Process

8. Load By Area/Levels The loads at different levels. Example – From Level 0 (Basement) to Level 7 and also different areas like Refiner floor, Preheater floor, ADI floor. Distributing MCCs depending the loads required at each level and area and running cables from the MCC at each area specifically to that particular area. All the installation done relying AS/NZS standards.

9. BENEFITS Long run of cables can be reduced to an extend. Easier to track cables. Work on particular area doesn’t affect the other areas. DISBENEFITS & RISKS Need of finding suitable places to install MCCs , MDB, DB. Hard to run the new cable trays and cables along with the existing cable rack and ladders. Also, need to make room in between the process pipes. The problem with pulp dust and water.

10. Load By Process The MCC distribution done depending on the loads for different process. Example- chip screening, chip wash 1 and 2 , refining primary and secondary, andrtiz 1 and 2 , Andritz 3 and 4, flash dryer 1, flash dryer 2 etc. Cables run from MCC specifically for primary refining process. Similarly all the other processes.

11. BENEFITS Cables run specifically for each processes and stay separate from each other. Easier to track cables. Work on particular area doesn’t affect the other areas. DISBENEFITS & RISKS Need of finding suitable places to install MCCs , MDB, DB The problem with pulp dust and water. The cables can be long run depending on the areas involved with each process.