CAT C32 - 3.2. Features; 3.3. Random Wound Stator Winding before Impregnation; 3.4. Rotor construction

Technical CATERPILLAR – 1000 kVA Page 9
Description UTILITY POWER MODULE
Revision 1.0 1 May 2006
3.2. Features
The Caterpillar
®
Series generators are the worldwide industry leaders. Features include:
• Superior harsh environment performance.
• Class H rotor and stator insulation.
• Suitable for continuing or prime power operation in harsh environments.
• Random wound/VPI stators provide superior handling of high switching loads &
harmonics.
• Built-in paralleling capability with adjustable voltage droop.
• 4-Pole terminal strip for convenient customer load connection.
• Least total harmonic distortion 0.7222 winding pitch.
• Standard voltages: 480V, 60Hz, 380V to 415V at 50 Hz.
• Standards: meets or exceeds the requirements of IEC 34-1, NEMA MG 1-22,
BS4999, BS5000, VDE0530, UTE5100, CSA22.2, ISO8528-3
Permanent Magnet Excited Generator:
The Caterpillar
®
SR4B
®
Permanent magnet exciter provides power isolation to voltage
regulator, which eliminates the need for series boost. The permanent magnet provides circuit
current sustaining for 300% rated current for 10 seconds. An additional feature is improved
performance with non-linear loads.
Marine certified by ABS, LR, DNV, BV, and others.
Radio frequency noise suppression meets industry standards MIL-STD-461,
82/449/EEC, VDE875/10.84.
3.3. Random Wound Stator Winding before Impregnation
 Coils fit precisely into slots, without voids, giving better mechanical and electrical
strength.
 Crimped and soldered lead connections.
 Large spaces between symmetrical coils:
o Improves winding cooling
o Reduces moisture retention
 Lacing, double surge ropes, and blocking of coil end turns minimizes coil movement
during surges.
 Insulation – Each stator is vacuum pressure impregnated (VPI) with class H polyester
insulation material. Each stator is then sealed with a class H epoxy material for
excellent abrasion protection.
3.4. Rotor construction
The exciter rotor is machine wound and receives two dips and bakes of a fungus-resisting
resin. The main rotor uses a precision “wet” layer wound process, with epoxy painted on the
bare rotor and on each layer. This ensures bonding of all the wire layers together, bonding of
the coils to the rotor laminations, and a sealed insulation system. The rotor epoxy is then
oven-cured.