By Greg C. Stone
A unmarried accomplished source for the layout, program, checking out, and upkeep of rotating machines
Filling a long-standing hole within the box, Electrical Insulation for Rotating Machines covers, in a single valuable quantity, all points of the layout, deterioration, checking out, and service of insulation utilized in automobiles and turbines. Lucidly written through top specialists, this authoritative reference offers either historic historical past vital to figuring out desktop insulation layout and the main updated details on new machines and the way to choose insulation structures for them.
insurance contains such key subject matters as:
- varieties of rotating machines, windings, and rotor and stator winding development
- comparing insulation fabrics and structures
- Stator winding and rotor winding insulation structures in present use
- Failure mechanisms and service
- trying out and tracking
- upkeep concepts
Detailing over 30 assorted rotor and stator winding failure techniques and reviewing virtually 25 diversified exams and displays used to evaluate winding insulation , Electrical Insulation for Rotating Machines can help computer clients stay away from pointless computer disasters, decrease upkeep bills, and encourage larger self assurance within the layout of destiny machines.Content:
Chapter 1 Rotating computer Insulation structures (pages 1–41):
Chapter 2 comparing Insulation fabrics and platforms (pages 43–71):
Chapter three historic improvement of Insulation fabrics and platforms (pages 73–94):
Chapter four Stator Winding Insulation platforms in present Use (pages 95–111):
Chapter five Rotor Winding Insulation platforms (pages 113–118):
Chapter 6 center Laminations and Their Insulation (pages 119–127):
Chapter 7 normal rules of Winding Failure, fix, and Rewinding (pages 129–136):
Chapter eight Stator Failure Mechanisms and service (pages 137–180):
Chapter nine Rotor Winding Failure Mechanisms and service (pages 181–209):
Chapter 10 middle Lamination Insulation Failure and service (pages 211–225):
Chapter eleven normal rules of trying out and tracking (pages 227–233):
Chapter 12 Off?Line Rotor and Stator Winding exams (pages 235–283):
Chapter thirteen In?Service tracking of Stator and Rotor Windings (pages 285–320):
Chapter 14 center checking out (pages 321–332):
Chapter 15 popularity and location checking out of latest Windings (pages 333–350):
Chapter sixteen upkeep suggestions (pages 351–364):
Read or Download Electrical Insulation for Rotating Machines: Design, Evaluation, Aging, Testing, and Repair PDF
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A unmarried finished source for the layout, software, checking out, and upkeep of rotating machines Filling a long-standing hole within the box, electric Insulation for Rotating Machines covers, in a single beneficial quantity, all features of the layout, deterioration, checking out, and service of insulation utilized in automobiles and turbines.
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Extra resources for Electrical Insulation for Rotating Machines: Design, Evaluation, Aging, Testing, and Repair
In addition to deteriorating the insulation, surface PD in air-cooled machines creates ozone. The ozone combines with nitrogen to create acids that pose a health hazard, and which can weaken rubber materials and corrode metal; for example in heat exchangers. To prevent PD on the coil or bar surfaces, manufacturers have long been coating the coil/bar in the slot area with a partly conductive coating. The coating is usually a carbonblack-loaded paint or tape. This coating, often called a semiconductive coating (although this has nothing to do with semiconductors in the transistor sense), is likely to be in contact with the grounded stator core at many places along the length of the slot.
2 for more comprehensive explanations. , furthest from the rotor). Consequently, if the strands in a Roebel coil were always in the same position within the bar, throughout the length of the bar, the strands closer to the rotor would have a greater induced voltage on them than strands furthest from the rotor. In a Roebel bar arrangement, all the strands are normally braised together at each end of the bar. qxd 6/22/2004 32 4:26 PM Page 32 ROTATING MACHINE INSULATING SYSTEMS ferent flux levels, then, by Ohm’s Law, an axial current will be forced to flow up and down the bar.
96. The force is expressed in kN of force acting per meter length of coil/bar in the slot. If the current in a stator bar is I = A sin t where is 2f, f is the 50 or 60 Hz power frequency, and t is time. 3) becomes kA2(1 – cos 2t) F = ᎏᎏ (2d) Thus, there is a net force to the bottom of the slot. , 100 Hz or 120 Hz. There is also a 100 or 120 Hz force in the circumferential direction caused by the rotor’s magnetic field interacting with the current in the stator coil/bar. 12]. The groundwall insulation must also help to prevent the copper conductors from vibrating in response to the magnetic forces.