Synchronous Generator AMG End Shield Bearing Bearing Construction
1 AMG 0710, 0900, 1120 2.11.1998 ABB Industry Oy
Type Designation Code AMG 0710MM06 ABB Industry Synchronous Machine G = generator Z = motor
Standard shaft height in millimeters Designation letter for frame length Designation letter for core length Number of poles
2 AMG 0710, 0900, 1120 2.11.1998 ABB Industry Oy
Main Components Transformers
Neutral Point
Line Terminals
Stator Core
Air Filters Stator Windings Shaft End Shield D-end Bearing Exciter
Fan Rotor Poles Diode Bridge 3 AMG 0710, 0900, 1120 2.11.1998 ABB Industry Oy
Detachable Feet
Rotor Windings
Stator Core and Frame • Stator core is made of punched, stacked, high-grade, low-loss silicon steel sheets • Sheet thickness is 0.5 mm (insulated on both sides)
• Frame and end shields are made of fabricated steel • Stator frame end parts and the middle part with the core are welded together • Bearing housings are bolted to the end shields
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Rotor • Rotor is designed to withstand the vibration caused by the prime mover and stresses appearing up to 120 % of rated speed • Critical rotational speed is at least 1.5 times the nomin al speed • Shaft is made of forged steel • Poles are constructed of punched and stacked steel plates • Salient poles are bolted to the rotor • Poles are provided with damper winding • Cooling and supporting of windings by aluminum profiles • Diode bridge is mounted on the exciter rotor hub that is shrink fitted on to the shaft
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Windings and Insulation • MICADUR�-Compact Industry (MCI) Insulation System based on VacuumPressure Impregnation (VPI) • VPI-method has been used 20 years and it is well known for its high reliability - no primary insulation failures on almost 15 000 machines delivered • Winding insulation exceeds Class F requirements (temperature limit 155°C) • Both stator and rotor windings withstand the influence of humidity, moisture and chemically aggressive substances. • Windings are made of form wound copper coils • The complete winding and its supporting structures are vacuum pressure impregnated with epoxy resin which ensures a very robust, solid and moisture resistant insulation. • Support rings on the winding ends are impregnated together with the winding • Excellent mechanical strength of the winding • Rotor winding are made of insulated enameled rectangular copper as a multi-layer winding
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Terminals • The stator line terminals and neutral terminals are situated in the top box on the top of the generator • Excitation transformers are installed in the terminal box • The terminals for excitation and control equipment are in auxiliary terminal box Main Terminals
Voltage Transformer
Neutral Point
Differential Protection Transformers Current Transformer for Parallel Operation 7 AMG 0710, 0900, 1120 2.11.1998 ABB Industry Oy
Short Circuit Current Transformers
Direction of Rotation • The generator ends are designed D (drive-end) and N (non - drive-end) in accordance with IEC 34-7 • The generator rotates counter-clockwise, when viewed from the D-end to N-end, the generator terminals U, V and W being connected to the network phases L3, L2 and L1 respectively • The direction of rotation is indicated on the generator rating plate.
CW
U
V
CCW
W
L1 L2 L3
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U
V
W
L1 L2 L3
Cooling • The generator is cooled with a shaft mounted fan • On standard arrangement the cooling air is drawn in through air filters, and blown out to the environment
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Mounting • Frame number 0710 in the machine type designation indicates the shaft height on IM 1001 mounting IEC-Code II / I IM 1001 IM B3 IM 1101 IM B20 IM 1305
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Figure
Explanation Bearings
Frame
2 end shields with feet
Shaft extension 1 cylindrical shaft extension
2 end shields with feet appr. 1 cylindrical level with shaft shaft extension 1 end shields with feet appr. flanged level with shaft
Protection by Enclosure • The standard degree of protection is IP 23 or IP 20 (protection against ingress of foreign bodies with diameter of 12 mm and above and harmful effects of spraying water)
• In cases where a higher degree of protection is needed, the generator can be provided with an air-to-water heat exchanger which is mounted on the top of the generator (the degree of protection is IP 44, protection against ingress of foreign bodies with diameter of 1 mm and above and harmful effects of splashing water)
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Balancing and Vibration • Dynamic balancing on two planes • Balancing is carried out with a half key • Balancing grade G6.3 • Vibration level of a fully assembled generator mounted on rigid foundation is below 2.8 mm/s (RMS) with nominal speed and excitation • Max.allowed vibration level is 20 mm/s (RMS) according to ISO 8528-9 (DIN 6280 Teil 11) • Reference measurement is always taken in three directions on the bearings (vertical, transversal and longitudinal)
12 AMG 0710, 0900, 1120 2.11.1998 ABB Industry Oy
Bearings and Lubrication • The generator is provided with split-type sleeve bearings as standard • Non-drive end bearing is insulated • Bearings are spherically seated to facilitate assembling and maintenance • The D-end bearing is designed to carry the loads produced by a coupling misalignment and the rotor weight
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Protection Against Corrosion • Screws washers and all surfaces made of steel sheet, aluminum alloy or cast iron are treated with a method appropriate to each material • Reliable anti-corrosion protection under the most severe environmental conditions • The standard painting is a two-pack epoxy paint which is moisture and tropic-proof in accordance with DIN 50016 • Suitable for outdoor installations, including chemical plants • Bearings are treated with an anti corrosion oil film • Shaft extension is protected with anti corrosion material that must be taken away before mounting the coupling
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Standards •
Rating and performance
IEC 34-1
•
Determination of efficiency
IEC 34-2
•
IP enclosures
IEC 34-5
•
IC methods of cooling
IEC 34-6
•
IM mounting arrangements
IEC 34-7
•
Terminal marks and direction of rotation
IEC 34-8
•
Noise limits
IEC 34-9
•
Vibration severity
IEC 34-1
•
Classification of insulating materials
IEC 85
•
Quality
ISO 9001
•
Environment
ISO 14001
On request •
Lloyd's Register of Shipping (LRS)
•
Det Norske Veritas (DVN)
•
Bureau Veritas (BV)
•
Germanischer Lloyd (GL)
•
American Bureau of Shipping (ABS)
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