Registers – Transfer mechanism – Traveling pawl
Patent
1974-01-21
1976-01-06
Morrison, Malcolm A.
Registers
Transfer mechanism
Traveling pawl
317 36D, 324 52, G01r 3108, G06r 1520
Patent
active
039315029
ABSTRACT:
At a measuring point serving at least one adjacent line segment instantaneous values of current and voltage are measured in sequential pairs, either continuously or at intervals by delaying these values by discrete amounts of delay corresponding to twice the wave propagation time on the line from the measuring point to a number of selected reference (appraisal) points along the line segment, and then combining the delayed value pairs corresponding to each appraisal point with a real time value pair. A voltage value at each appraisal point at the mid-point of the delay period is determined by use of delayed measured values that take account of line propagation characteristics such as damping. In one form of processing, the appraisal point voltage thus obtained is then squared or otherwise processed to provide a unimodal function, and then further processed by an average function generator to yield an evaluation function for the appraisal point which can effectively be compared with one or more limit values for control of warning and cut-off devices designed to be activated in case of a failure. In a second form of processing, the gradients of the appraisal point voltage at the two ends of the line segment in question are continually or sequentially calculated and their respective signs are compared in such a way as to activate warning and cut-out systems when the presence of a voltage minimum within the line segment is detected. The system operates without circuits of the kind that require measured voltages and currents to be resolved into sinusoidal components or proper evaluation of transients.
REFERENCES:
patent: 3277343 (1966-10-01), Seeley
patent: 3590368 (1971-06-01), Esclangon
patent: 3612989 (1971-10-01), Souillard et al.
patent: 3723864 (1973-03-01), Ricard
patent: 3735204 (1973-05-01), Maenicke
patent: 3800215 (1974-03-01), Souillard
BBC Brown Boveri & Company Ltd.
Morrison Malcolm A.
Smith Jerry
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