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High voltage electric motors and generators are essential components of the electrical power systems since their perfect operation determines the quality of power supply. Moreover, faults affecting these machines are usually serious for the electrical facility and the production process in which they are involved. Insulation faults are the most critical breakdown on electrical rotating machines. This reason makes the prevention of insulation faults on the stator windings of rotating machinery an important goal to improve the quality of electrical power systems. To achieve such an improvement two different tasks must be carried out: on the one hand, periodical revision of the insulation systems must be performed. On the other hand, a precise and reliable quality control must be applied to the coils manufacturing process in order to prevent manufacturing defects that could lead to a latter insulation fault. This quality control is carried out by means of tests similar to those ones used in periodical maintenance [1]. This paper presents a study about the effectiveness of some of these test procedures in the detection of manufacturing defects.

Fault detection in the manufacturing process of form-wound coils by means of dissipation factor and hipotesis