G - Physics – 01 – R
Patent
G - Physics
01
R
324/17
G01R 31/00 (2006.01) G01R 15/00 (2006.01) H02K 5/00 (2006.01)
Patent
CA 1249024
ABSTRACT OF THE DISCLOSURE INTERNAL ARMATURE CURRENT MONITORING IN LARGE THREE-PHASE GENERATOR A three- phase generator includes an internal neutral junction to which one end of each of the windings of the generator is connected thereby forming a wye-connected generator. An air-core current transformer is disposed over each of the three conductors leading to the internal neutral junction for monitoring neutral current therein. A corresponding air-core current transformer is disposed over high-voltage terminals connected to the other ends of the generator windings. A shielded differential amplifier on the output of each air-core current transformer produces a signal corresponding to the difference between two bifilar half windings in its associated air-core current transformer. The difference currents from the neutral and high-voltage ends of each generator winding are compared, and, if their difference exceeds a predetermined threshold, a threshold circuit produces a trigger signal which is latched by a latching relay to produce s trip signal for use by the generator control system. Connectors are provided for isolating two of the three generator windings from the internal neutral junction to enable isolated testing of the three windings.
526231
Rink Frederick J. Jr.
Stephens Charles M.
Company General Electric
Eckersley Raymond A.
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