A sensor apparatus for monitoring voltage and/or current in an electric circuit and a system for monitoring voltages and currents in a system wherein electricity is distributed in a plurality of circuits. A sensor apparatus is associated with each phase conductor in each of the circuits. The sensor apparatus senses the electricity in the phase conductor and provides a digital output that is representative of the sensed electricity in the phase conductor. The digital output preferably includes phasor data for the sensed phase conductor. The monitoring system includes a plurality of such sensor apparatuses. The plurality of sensor apparatuses are coupled to a digital data network that provides for the exchange of sensed data among nodes on the digital data network. On a node of the network, phasor data from some of the plurality of sensor apparatuses are summed or otherwise processed to obtain phasor data representative of a plurality of the circuits.

Digital sensor apparatus and system for protection, control, and management of electricity distribution systems

The present invention relates to fault detection in a large population of motors of a common motor type. Initially, a plurality of motors of a common motor type is tested to obtain a first residual based on selected measured operating parameters. A second residual is then developed for each individual motor comprising the plurality of motors. If the difference between the first and second residuals exceeds a selected threshold, the motor generating the second residual is defective and removed from the plurality of motors and the threshold is adjusted to reflect the removal of the defective motor from the plurality of motors. The first residual may be used to monitor the operation of motors not included in the original plurality of motors to detect impending failure.

Model-based fault detection system for electric motors

A motor performance analyzer senses currents and voltages applied to the motor, converts the sensed signals to digital data signals, and stores the digital data signals. The analyzer includes a processor for evaluating the digital data and a display for alerting a user or technician to potential motor problems, or to developing problems, including winding faults and broken rotor bars. Advanced signal processing techniques are used to further evaluate stored data and to provide trending information.

Motor condition and performance analyzer

A leak detection system (300) is described for detecting a leak through a closed valve disposed between an upstream pipe and a downstream pipe of an industrial process. An insertable plate (302) is coupled to the valve in the pipe in-line with the fluid flow. A sensor (316) couples to the flow and provides a signature output. A leak detector (324) is coupled to the sensor (16) and adapted to detect a leak through the valve based upon the signature output.

Leak detector for process valve

A fiber optic telecommunications device includes a frame and a fiber optic module including a rack mount portion, a center portion, and a main housing portion. The rack mount portion is stationarily coupled to the frame, the center portion is slidably coupled to the rack mount portion along a sliding direction, and the main housing portion is slidably coupled to the center portion along the sliding direction. The main housing portion of the fiber optic module includes fiber optic connection locations for connecting cables to be routed through the frame. The center portion of the fiber optic module includes a radius limiter for guiding cables between the main housing portion and the frame, the center portion also including a latch for unlatching the center portion for slidable movement. Slidable movement of the center portion with respect to the rack mount portion moves the main housing portion with respect to the frame along the sliding direction.

Slidable Fiber Optic Connection Module with Cable Slack Management

A method for determining at least one operating parameter to determine the operating condition of a polyphase electric motor system comprises sensing the instantaneous current signal and the instantaneous voltage signal as a function of time for more than one electrical phase of the motor. The sensed current signals and the sensed voltage signals are both amplitude demodulated and phase demodulated to provide amplitude demodulated current and voltage signals as a function of time and phase demodulated current and voltage signals as a function of time. The resulting amplitude and phase demodulated signals are used to determine one or more of the following electrical parameters as a function of time: total real power, real power per phase, total reactive power, reactive power per phase, total apparent power, apparent power per phase, overall power factor, power factor per phase, electrical impedance per phase, and electrical balance.

Method and apparatus for analysis of polyphase electrical motor systems

A method and apparatus for on-line detection of leaky emergency shut down or other valves (10) in a fluid transport system having an upstream pipe, a downstream pipe and the valve (10) connected between the upstream pipe and the downstream pipe for controlling fluid flow through the system.

Method and apparatus for on-line detection of leaky emergency shut down or other valves

A method is disclosed for approximating the stem thrust during the operation of a motor operated valve combination including a valve having a valve stem, a valve disk, a valve seat, and a motor operator having a motor drive means interconnecting the motor to the valve stem for movement of the valve stem disk toward and into engagement with the valve seat to close the valve and a control switch for deactivating the motor. The method comprises the steps of sensing the stem thrust of the motor operated valve combination as a function of time during valve closing at a first time and establishing a thrust trace; sensing the real electrical power of the motor as a function of time during valve closing at a second time which is subsequent to the first time and establishing a power trace; relating corresponding points of the thrust trace and the power trace starting at a point on each trace corresponding to the onset of wedging of the valve disk and extending to a point of the power trace at which the control switch deactivates the motor; determining from the power trace the value of the power at the zero thrust point; determining a best fit analytical function that takes into account the zero thrust power point and the changing thrust vs change in power relationship described by the corresponding time points of the two traces from the onset of wedging to deactivation of the motor by the control switch; and approximating from the best fit analytical function a thrust value associated with a point on the power trace at the second time.

Method for remotely approximating the stem thurst of motor operated valves

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Papers

Method and apparatus for analysis of polyphase electrical motor systems

Method and apparatus for on-line detection of leaky emergency shut down or other valves

Method for remotely approximating the stem thurst of motor operated valves