MEASUREMENT OF SYNCHRONOUS GENERATOR DATA FROM DIGITAL FAULT RECORDERS FOR TRACKING OF PARAMETERS AND FIELD DEGRADATION DETECTION

This paper presents a description of advanced instrumentation technolo gy developed at Arizona Public Service (APS) for on-line monitoring of large turbogenerators. These signals include three-phase generator vo ltages and currents, generator held winding voltages and currents, gen erator power angle and turbine front standard speed deviation. The dat a is collected by a 16 analog channel 10 bit digital fault recorder (D FR) for several operating conditions including steady state, transient events due to transmission line faults, etc., and staged tests. The p aper also discusses the methodology behind the use of these measured s ignals for on-line tracking of the stability parameters of a synchrono us generator. In this context, a procedure for the on-line estimation of machine parameters and turns ratios will be developed. Continuous m onitoring of the machine parameters and turns ratios in real time may then be used for incipient failure detection. (C) 1996 Elsevier Scienc e S.A.