Download Electrical insulation for rotating machines by Greg Stone, Edward A. Boulter, Ian Culbert, Hussein Dhirani PDF

Download Electrical insulation for rotating machines by Greg Stone, Edward A. Boulter, Ian Culbert, Hussein Dhirani PDF

By Greg Stone, Edward A. Boulter, Ian Culbert, Hussein Dhirani

A unmarried complete 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 facets of the layout, deterioration, checking out, and service of insulation utilized in vehicles and turbines. Lucidly written by means of prime specialists, this authoritative reference offers either ancient heritage vital to knowing laptop insulation layout and the main updated details on new machines and the way to pick insulation platforms for them. assurance comprises such key issues 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
- checking out and monitoring
- upkeep strategies
Detailing over 30 diversified rotor and stator winding failure tactics and reviewing virtually 25 assorted exams and displays used to evaluate winding insulation situation, electric Insulation for Rotating Machines may help computer clients stay away from pointless computing device disasters, lessen upkeep expenses, and encourage higher self belief within the layout of destiny machines.

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Electrical Insulation for Rotating Machines: Design, Evaluation, Aging, Testing, and Repair

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 worthy quantity, all points of the layout, deterioration, checking out, and service of insulation utilized in automobiles and turbines.

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Additional resources for Electrical insulation for rotating machines

Example text

Since the breakdown strength of typical solid groundwall insulation materials is in excess of 300 kV/mm, there is practically no possibility of the groundwall insulation itself experiencing electrical breakdown. Rather, PD will occur only when there are gas-filled voids within the groundwall. These discharges are harmful to the groundwall, because repeat PD will eventually degrade the solid insulation by breaking the chemical bonds. The spark contains electrons and ions that bombard the insulation surfaces of the void.

Roebel bars (half-turn coils) always have a transposition. Usually, extra insulation is needed in the vicinity of the transposition to ensure that strand shorts do not occur. The need for transpositions of the copper strands will be briefly explained first for Roebel bars. 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.

6. (a) Photograph of a form-wound motor stator winding. ) (b) A single form-wound coil being inserted into two slots. 12 ROTATING MACHINE INSULATING SYSTEMS plied over the coil loops. 4. Careful design and manufacture are used to ensure that each turn in a coil is adjacent to another turn with the smallest possible voltage difference. By minimizing the voltage between adjacent turns, thinner insulation can be used to separate the turns. For example, in a 4160 volt stator winding (2400 V line-to-ground), the winding may have 10 coils connected in series, with each coil consisting of 10 turns, yielding 100 turns between the phase terminal and neutral.

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