Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2006-11-21
2006-11-21
Patel, Paresh (Department: 2829)
Electricity: measuring and testing
Magnetic
Displacement
C324S207120, C324S511000, C361S078000
Reexamination Certificate
active
07138794
ABSTRACT:
Systems and methods for detecting faults in RVDTs and LVDTs are described. In an exemplary embodiment, a sum of secondary voltages V1 and V2 from a transducer is obtained by adding the secondary voltages together, i.e.; V1+V2. This sum of secondary voltages theoretically should be constant for all LVDT/RVDT positions, since the total length of the secondary transformer is constant. An electrical fault in the primary or secondary windings generates a corresponding change in the sum of secondary voltages. By comparing this shifted value to a reference value which is representative of a no-fault condition, an error value is created which indicates the magnitude of the shift in the sum of the secondary values. Depending upon the magnitude of the error value, certain actions are taken.
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European Search Report, three pages, Jun. 22, 2001.
Cook Kenneth F.
Wittenbach Robert D.
Andes William Scott
Armstrong Teasdale LLP
General Electric Company
Patel Paresh
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