By Greg C. Stone
A unmarried entire source for the layout, program, trying out, and upkeep of rotating machines
Filling a long-standing hole within the box, Electrical Insulation for Rotating Machines covers, in a single helpful quantity, all points of the layout, deterioration, checking out, and service of insulation utilized in automobiles and turbines. Lucidly written via prime specialists, this authoritative reference offers either old history vital to realizing laptop insulation layout and the main up to date details on new machines and the way to choose insulation platforms for them.
assurance comprises such key themes as:
- different types of rotating machines, windings, and rotor and stator winding development
- comparing insulation fabrics and platforms
- Stator winding and rotor winding insulation structures in present use
- Failure mechanisms and service
- trying out and tracking
- upkeep techniques
Detailing over 30 various rotor and stator winding failure procedures and reviewing virtually 25 varied assessments and screens used to evaluate winding insulation , Electrical Insulation for Rotating Machines may also help laptop clients stay away from pointless desktop mess ups, lessen upkeep expenditures, and encourage better self belief within the layout of destiny machines.Content:
Chapter 1 Rotating computer Insulation platforms (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 structures (pages 113–118):
Chapter 6 middle Laminations and Their Insulation (pages 119–127):
Chapter 7 basic 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 basic rules of checking out and tracking (pages 227–233):
Chapter 12 Off?Line Rotor and Stator Winding checks (pages 235–283):
Chapter thirteen In?Service tracking of Stator and Rotor Windings (pages 285–320):
Chapter 14 middle trying out (pages 321–332):
Chapter 15 popularity and location checking out of latest Windings (pages 333–350):
Chapter sixteen upkeep innovations (pages 351–364):
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Extra info for Electrical Insulation for Rotating Machines: Design, Evaluation, Aging, Testing, and Repair
Rotor turn insulation faults in synchronous machines are much less important than similar turn faults in the stator winding. 2, which induce a large current to flow around the shorted turn. The main impact of a rotor turn short is to reduce the magnetic field strength from the affected rotor pole. This creates an unsymmetrical magnetic field around the rotor periphery, which tends to increase rotor vibration. Vibration can also occur due to nonuniform heating of the rotor surface, since unfaulted turns in slots will have a higher current and, consequently, a higher local temperature, than slots containing shorted turns.
By reducing the size of the conductors, there is a reduction in stray magnetic field losses, improving efficiency. The electrical reasons for stranding require the strands to be insulated from one another. The voltage across the strands is less than a few tens of volts; therefore, the strand insulation can be very thin. The strand insulation is subject to damage during the coil manufacturing process, so it must have good mechanical properties. 9. Cross sections of slots containing (a) form-wound multiturn coils; (b) directly cooled Roebel bars.
It has a low resistance state), while being fully insulating during normal operating voltage of a transmission line. When applied to stator coils and bars, the silicon carbide has a very low resistance in the high-stress region at the end of the slot semiconductive coating, and gradually increases its resistance further along the end-winding from the core. This varying resistance makes the electric field at the end of the semiconductive coating more uniform. Usually, the stress is reduced to below the critical 3 kV/mm (in air) that would initiate PD.