An apparatus and method for the identification of arcing phenomena in a faulted electrical network. By continually updating a model for the load on an electrical branch, an estimate of the behavior of that load may be calculated. Since electrical arcing faults result in a chaotic behavior that is difficult to describe, when arcing occurs, the model will be unable to adequately describe the arcing behavior and this inability indicates a fault condition, in response to which, power may be removed ...

An ultrasonic signal processing method for improving the signal-to-noise ratio in ultrasonic measurements comprises the transmission of a predefined timed sequence of a number of ultrasonic burst signals at a first transducer, and reception of a signal representing said transmitted sequence of ultrasonic burst signals at a second transducer. This signal is processed by addition of multiple time-shifted copies of the received signal to said original received signal to obtain a sum of the original...

For the purpose of validating fault symptoms appearing at driver outputs, a symptom validation unit is provided, within a final stage, which undertakes a validation or a preliminary validation, as applicable, on the basis of a classification of symptoms. By assigning the item of validation data "invalid" to symptoms which cannot be unambiguously identified, it is possible to suppress the further consideration of the symptoms, or to initiate further diagnoses of the final stage output concerned, ...

A rotational vibratory viscometer-densitometer for in-line process control and similar applications, having an elastic hollow metal tube extending between two clamps, and a relatively rigid transverse yoke secured to the tube at a point midway between the clamps. The yoke has magnetically permeable ends and a magnetically permeable center portion. Electromagnets adjacent one end of the yoke and the center portion thereof interact with the yoke to cause the tube to oscillate simultaneously in tor...

An accurate impedance measurement method for a power system transmission line is disclosed for improving various protection functions, i.e., distance protection and/or fault location estimation. The method is less sensitive to harmonics and other transient problems introduced to power systems by series capacitance and the like, and is easily incorporated into existing protective relays. In the method, a number (n) of current and voltage samples (I.sub.k, V.sub.k) representative of values of curr...

Methods, systems, and articles of manufacture consistent with the present invention provide for determining the location of a short circuit in a branched wiring system. The distance from the short circuit to an impedance measurement point is determined based on a measured impedance of the branched wiring system. The branch in which the short circuit is located is then determined by identifying a calculated high-frequency impedance phase spectrum for the branched wiring system with one of the bra...

A system for pinpointing CDP sources in a two-way HFC CATV network comprises a headend CPD radar unit, a return path switch, and a computer. The radar unit is coupled to a headend combiner. The return path switch is coupled between the nodes of the CATV network and the radar unit. The computer is connected to the radar unit and the return path switch. The computer controls the radar unit and switch and causes them to perform constant sequential CPD monitoring of the nodes of the network. The sys...

One embodiment of the present invention provides a system that dynamically adjusts data resolution during proactive-fault-monitoring in a computer system. During operation, the system temporarily stores high-resolution data for a telemetry signal from the computer system in a buffer. The system then generates low-resolution data for the telemetry signal from the high-resolution data. Next, the system monitors the low-resolution data, and while doing so, determines if an anomaly exists in the low...

An efficient method for identifying potential noise failures in an integrated circuit design by predicting peak noise within a victim circuit of an integrated circuit. Initially, a victim circuit within an integrated circuit is located. An aggressor circuit within the integrated circuit is located which has a physical relationship with the victim circuit, normally proximity. The slope of a signal within the aggressor circuit is analyzed and the coupling currents induced in the victim circuit by ...

An abnormality detection apparatus and an abnormality detection method are provided. In a motor abnormality detection apparatus for detecting an abnormality of a motor, a current measurer measures the current flowing through the motor. A voltage measurer measures the voltage applied to the motor. A motor state detector detects the operation state of the motor. A current estimator estimates the current flowing through the motor based on the measured value of the voltage measurer and the detection...