Test probe for electrical devices having low or no wedge...

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters

Reexamination Certificate

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Reexamination Certificate

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06927598

ABSTRACT:
A probe for use in detecting abnormalities in an electrical device having a wedge depression of no more than 100 mils. The probe includes a solid core surrounded by a sense coil. The ends of the core are arranged in a contact-free, spaced relationship between and at least partially above opposed surfaces of adjacent lamination teeth of a stator. Air gaps are maintained between the ends of the probe core and the opposed surfaces. The total of the two air gaps is constant. The probe is supported on a carriage arrangement and moved along the teeth. Variations in leakage flux produced with the stator energized with an energization winding to produce a flux which is a few percent of a normal energization level, are monitored.

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“Experience With Modified Iron Fault Control Technique for the Stator Cores of Electrical Machines,” V.B. Berezhansky, L.I. Chubraeva; Paper STP EM 05-07-0205 accepted for presentation at the IEEE/KTH Stockholm Power Tech. Conference, Stockholm, Sweden, Jun. 18-22, 1993.
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