First, the insulation of the rotating electrical machine
    The insulation of a rotating electrical machine can generally be divided into main insulation, inter-turn insulation, inter-strand insulation and interlayer insulation. The main insulation refers to the insulation between the winding and the other windings, also called the grounding insulation; the inter-turn insulation refers to the insulation between the turns of the same winding; the inter-strand insulation refers to the insulation between the strands of the parallel wires. Interlayer insulation refers to the insulation between the upper and lower layers of the winding.
Second, the rotating motor winding insulation structure type
    1. Fixed, rotor winding insulation
    The structure of the rotating electrical machine is mainly divided into two parts: the stator and the rotor. The stator and the rotor are respectively composed of a core and a winding. The stator winding is formed by a plurality of coils (or bars), each of which is wound by a copper wire and insulated. The straight section is placed in the core slot and the end is fixed by the winding bracket. The rotor winding is insulated with a wide wire and wound around the rotor core slot. Figures 1-3 and 1-4 show the slot insulation structure of the stator windings of the external cooling motor and the water internal cooling motor, respectively, and Figure 1-5 shows the slot insulation structure of the rotor winding.
    Figure 1-6 and Figure 1-7 show the end-sound insulation structure of the stator and rotor windings of the rotating machine.
    For a hydro-generator, the stator winding insulation is similar to that of a gas-cooled motor. However, the rotor winding is different from the rotor winding of the turbo generator. It belongs to the salient-pole rotor and consists of magnetic poles, field windings, damper windings, magnetic coils, rotor brackets, shafts, etc., as shown in Figure 1-8.
    In order to give the reader a concept of quantity, Table 1-2 lists the insulation thickness of the stator windings of the motor commonly used in China.
    2. Anticorona measures for stator windings
    There is a certain air gap between the winding of the stator groove portion of the rotating electrical machine and the wall of the groove, and corona discharge is likely to occur between the wire having a high potential and the core having a zero potential. The electric field distribution at the motor outlet is more uneven, so the corona at the end notch is more severe than in the groove. To this end, the following anti-corona measures should be taken:
    (1) Improve materials and processes to minimize air gaps inside the insulation.
    (2) The semiconductor glass ribbon is wrapped on the outer layer of the winding, and the inner wall of the stator slot is sprayed with a semiconductor paint before the lower line to reduce the voltage on the air gap and suppress the occurrence of corona.
    (3) After the lower wire, the gap between the winding and the groove wall is plugged with a semiconductor compliant material or a semiconductor glass wire plate.
    (4) The above-mentioned semiconductor material is required to have a surface resistivity in the range of 103 - 10 5 Ω·cm. Can not be too low, otherwise it may short-circuit the iron core silicon steel sheet.
    (5) The end surface of the slot of the stator winding of the motor is coated with a semiconductor lacquer, and the first or second constant resistivity semiconductor antihalation layer, the silicon carbide antihalation layer or the inner shield antihalation layer is used.
    See Table 1-3 for the anti-corona structure at the end of the stator winding.
Note: Sleeve type insulation means that the connection between the straight part and the end of the motor winding is reverse-tapered; continuous insulation means that the same insulation tape is used to wrap several layers around the winding to achieve the required thickness. Its preferred part and end are the same kind of insulation.
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