Unipak 2 CACA/CACW High Voltage A C Induction …

1 Vertical UNIPAK2 motor Unipak 2 CACA/CACW . high Voltage A C. Induction Motors A Regal Brand Unipak2. One of India's most modern motor MARATHON Electric has over IP 55 enclosure protection as factories, incorporating extensive CAD 2500 MW installed world-wide. standard on enclosed machines. facilities with over 50 years' experience Upto 4000 KW range capability. Factory fixed Air Gap. in the design and application of Induction motors, enables MARATHON All speeds available. Compliance with National and Electric to offer the benefits of proven International Standards. Highest available efficiency - rapid solutions : pay-back. Built to type N requirements. high Power Factor - Low Power Upto 11 kV, 50 or 60 Hz. supply. Cost. Low Starting Current design 20 years' expected design life at available.

2 1000 starts per year Variable speed drive compatibility. Resivac VPI Insulation System for Horizontal mounting. total winding reliability. Rolling or Plain Bearings. Highest quality - lowest maintenance costs. Environmentally friendly motors to meet all drives. Low Noise Level - Better performance than IS:12065. Type e version available on request. Low vibration level - conforms to IS:12075. Slipring version available. 2. Standards and Specifications Compliance with the International Standard IEC 34 ensures that motors POWER OUTPUT. also meet the requirements of other 4000. aligned National Standards 3600. including : 3200. 2800. IS:325 INDIA. 2400. NBN 7 : 1963 BELGIUM 2000. NF C 51-111 FRANCE. KW. 1600. VDE 05301 GERMANY 1200. CEI 2-3, N. 355 ITALY 800. NEN 3173 NETHERLANDS 400.

3 NEN NORWAY. SEN 2601 01 SWEDEN. SEV 3009 SWITZERLAND Voltage 3300 6600 3300 6600 3300 6600 3300 6600 3300 6600 3300 6600. B5 4999 & 5000 UNITED POLES 2(3000) 4(1500) 6(1000) 8(750) 10(600) 12(500). KINGDOM (REV/MIN). Compliance with other specifications NOTE : FOR 11 KV , PLEASE REFER TO WORKS. and standards such as NEMA-MG1. and API 541 can be offered, and met, together with machines for ventilation using shaft mounted steel further major user specifications can variable speed drive systems. Proven fans to circulate the internal cooling be met on request. Please check with designs exist for most driven equipment air. CACA (TEAAC) motors are fitted our sales department of the address needs ( compressors, pumps, fans, as standard with high efficiency, uni- given on the back of this publication crushers and mills).

4 Directional low noise level, shaft for more detailed information. mounted steel fans. Electrical Supply Many company and project All National and International supply Noise Level specifications use IEC as a basis or reference and thus compliance may voltages and frequencies are catered Particular attention has been given to be asured. for by the Unipak range. all sources of noise generation and Unipak standard designs meet the most Cooling Methods Insulation stringent modern requirements, ( Air-cooled CACA (TEAAC) IC 0161, Unipack Class F Resivac Vacuum and typically 85 dB (A) at 1 metre). Water-cooled CACW (TEWAC) IC Pressure Impregnation Insulation OA1W7, Open Ventilated (OVDP) IC systems comply with IEC 85. After Vibration 01, and NEMA II enclosures are impregnation the stator windings are Unipak motors comply with the available as standard options.

5 Subjected to the Voltage tests specified requirements of API 541, and in IEC All machines are subject IS:12075. Rotors are dynamically Mounting Arrangements to loss tangent tests. balanced prior to assembly in two Horizontal Foot Mounting to IM 1001 planes. Vibration is then checked on Degree of Protection by test before and after overspeed tests & Vertical Mounting to IM 3011. Enclosure to prove stability. Dimensions IP 55 as standard for totally enclosed Shaft and fixing dimensions are in water or air cooled machines. Efficiency accordance with the requirements of Protection and enclosure types are as Typically, full load efficiencies greater IEC 72 and 72A together with recommended by IEC 34-5 & IS:4691. than 96% are achieved as standard BS 4999 part 141 & IS:8223. ensuring low operating costs.

6 Cooling Method Frame Sizes Methods of cooling are as Starting Current Shaft centre heights from 400 to 710 recommended by IEC 34-6 (complete Standard designs are within BS 4999. mm are covered. system) & IS:6362. Part 112 design D limits. Lower starting current designs can be tailored to suit Speeds Ventilation specific supply system limitations where All fixed speed requirements can be The designs employ radial ducted required. 3. Construction Rotor Cage Windings Rotor bars are designed and manufactured to maintain a tight fit throughout the slot length and depth, and are connected to the end-rings by means of a specially developed one- shot brazing process ensuring total reliability throughout the life of the motor . Cage designs are optimised to ensure a minimum starting capability of 1000 starts per year over a 20-year period.

7 Frames Unipak motor frames are of box configuration, manufactured from cast iron or Fabricated Steel, thus ensuring an extremely robust and rigid support structure. The top of the frame has a rectangular opening to allow fitment of the air/air or air/water heat exchanger, or alternative ventilation arrangements. Stator and Rotor Cores Stator core packs are built on expanding mondrels using packets of insualted, low-loss laminated electrical steel, interspersed with I-beam spacer sections which form radial cooling ducts. Cores are hydraulically compressed between substantial steel end-plates and the entire assembly is secured by sequentially welding langitudinal steel core-bars to the back of the laminations and the end-plates to maintain the pressure. The core bars extend beyond the end plates to form rigid anchorages for bracing of the end windings.

8 Rotor cores are built against a compression plate utilising packets of insulated laminations in a similar manner to the stator cores. These are then shrunk onto the shaft assembly and retained by circumferential keys. 4. Stator Coils All Unipak stator Coils are manufactured from annealed copper strip, insulated with mica-paper tape. Loops are formed withthe appropriate number of turns, and the coil is then pulled into the required shape in a forming machine. Layers of mica tape insulation are then added, followed by the application of corona shield or semi-conducting tape as appropriate to the supply Voltage . The coils are inserted into their slots in the stator core pack and fixed firmly in position with slot wedges. Endwindings are securely braced, thus ensuring the prevention of movement during starting and service.

9 high Voltage tests are carried out both before and after connection, and again after impregnation in order to check insulation integrity. On completion of the winding process, resistances and impedances are checked for balance and design conformly. End Winding Bracing The end winding bracing system is designed to match the rotor capability of a minimum 1000 starts per year for 20 years and to withstand the stresses involved in 180 degrees out-of-phase reswitching. Winding Impregnation The RESIVAC Vacuum Pressure Impregnation System (VPI) is employed on all Unipak Motors. This system ensures global impregnation of the entire wound stator core assembly using a specially developed solventless epoxy resin. The process guarantees that all air and moisture is extracted under vacuum from the winding before pressure then forces resin into every void within the assembly.

10 Curring of the resin is carried out whilst constantly rotating the assembly in on oven to ensure even distribution. The entire impregnation operation is microprocessor controlled and data logged to ensure total reliability of the windings during ser vice life. 5. Unipak 2 CACA TYPICAL SECTION. TERMINAL RAIL CACW Cooler FRAME POCKET. TERMINALS. COOLER ENDBRACKET. GASKET. COVER PLATE. GASKET GLAND PLATE. TYPICAL TERMINAL ASSEMBLY. INLET MESH. FAN INLET EYE. SATOR FRAME. FAN COWL. BEARING. INNER CAP EXTERNAL FAN. ENDBRACKET. COPPER ENDRING. FLINGER COPPER BAR. LAMINATIONS. COVER PLATE. HEATER. CORE END-PLATE. GASKET INTERNAL FAN. FAN BAFFLE. TERMINAL BOX. LAMINATIONS. FRAME BASE. ROTOR SHAFT. GASKET. COVER PLATE SHAFT SEAL. CORE-BAR. SPREADING CHAMBER. HEATER LOCATION AT EACH END OF FRAME STATOR COREPACK PRIOR TO WINDING.