By Greg Stone, Edward A. Boulter, Ian Culbert, Hussein Dhirani
A unmarried accomplished source for the layout, program, trying out, and upkeep of rotating machines
Filling a long-standing hole within the box, electric Insulation for Rotating Machines covers, in a single helpful quantity, all elements of the layout, deterioration, checking out, and service of insulation utilized in cars and turbines. Lucidly written through major specialists, this authoritative reference presents either old history very important to figuring out desktop insulation layout and the main updated details on new machines and the way to pick insulation structures for them. insurance contains such key themes as:
- varieties of rotating machines, windings, and rotor and stator winding construction
- comparing insulation fabrics and systems
- Stator winding and rotor winding insulation structures in present use
- Failure mechanisms and repair
- trying out and monitoring
- upkeep strategies
Detailing over 30 varied rotor and stator winding failure techniques and reviewing nearly 25 various assessments and displays used to evaluate winding insulation , electric Insulation for Rotating Machines may help computer clients steer clear of pointless computing device disasters, decrease upkeep bills, and encourage better self assurance within the layout of destiny machines.
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A unmarried finished source for the layout, program, checking out, and upkeep of rotating machines Filling a long-standing hole within the box, electric Insulation for Rotating Machines covers, in a single valuable quantity, all elements of the layout, deterioration, checking out, and service of insulation utilized in cars and turbines.
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Extra resources for Electrical insulation for rotating machines
2). In addition, if too many shorted turns occur, then much more excitation current will be needed to create the magnetic field for the required output. Although shorted rotor turns in themselves may not be hazardous to the machine, if the number of shorts are increasing over time, then it may be an indicator that there is a greater risk that a rotor ground fault may occur. Wound induction motor rotors experience much the same thermal and mechanical environment as synchronous machine rotors. However, instead of a constant DC current, this type of motor rotor winding sees an initial 50/60 Hz inrush current during motor starting, followed by a gradual reduction in current and current frequency as the motor comes up to speed.
The weight of the copper conductors will tend to compress and/or distort any insulation. Thus, the rotor winding insulation must have very high compression strength and be supported to prevent distortion. An additional mechanical (or more properly thermomechanical) stress occurs whenever the machine is turned on and off. When the rotor winding is excited, the current through the conductors causes the copper temperature to rise, and the copper will experience axial growth due to the thermal coefficient of expansion.
8) where ln is the natural logarithm. This shows that the radius is critical to the maximum electric field. ” In the early days of high-voltage rotating machines, the electric field just outside of the slot was made more uniform by embedding concentric floating metal foils of specific lengths within the volume of the groundwall, in the area where the semiconductive coating ends. 14]. However, when a unique material called silicon carbide became available, it superceded the bushing approach. Silicon carbide is a special material that has an interesting property: as the electric stress increases in this material, its resistance decreases.