1062 results about "Fault indicator" patented technology

A robust alarm system has an alarm controller adapted to input an alarm trigger and to generate at least one alarm drive signal in response. Alarm subsystems input the alarm drive signal and activate one or more of multiple alarms accordingly. A subsystem function signal provides feedback to the alarm controller as to alarm subsystem integrity. A malfunction indicator is output from the alarm controller in response to a failure within the alarm subsystems.

A fault detection mechanism for a LED string comprising a plurality of serially connected LEDs, the fault detection mechanism comprising: a control circuitry; and a voltage measuring means, in communication with the control circuitry, arranged to measure the voltage drop across at least one LED of the LED string, the control circuitry being operable to: measure the voltage drop, via the voltage measuring means, at a plurality of times, compare at least two of the measured voltage drops, and in the event the comparison of the at least two voltage drops is indicative of one of a short circuit LED and an open circuit LED, output a fault indicator.

The present invention includes a fault indicator for an electrical transmission line comprising: a fault indicator circuit; and a remote communicator operatively coupled to the fault indicator circuit to transmit condition data to a remote location, where such condition data includes current load data. The invention also includes a method of monitoring and responding to current faults and load variations across an electrical transmission network, the method comprising: installing two fault indicators in electrical communication with an electrical transmission network and including two-way communication capability; generating, by the two fault indicators, condition data specific to a respective location of each of the two fault indicators, where such condition data includes current load data; transmitting the condition data from the two fault indicators to a remote location; receiving, at the remote location, the condition data transmitted from the two fault indicators; and, monitoring and processing the condition data received.

An integrated controller for controlling a vapor compression based heating and cooling system. The integrated controller includes modules for independently controlling dry bulb temperature, humidity level, and incorporating a fault detection module therewith. The fault detection module being capable of detecting abnormal refrigerant levels using only temperature sensors on the condenser with thermal expansion valve or evaporator with fixed orifice type of expansion valve.

A method and system for early detection of incipient faults in an electric motor are disclosed. First, current and voltage values for one or more phases of the electric motor are measured during motor operations. A set of current predictions is then determined via a neural network-based current predictor based on the measured voltage values and an estimate of motor speed values of the electric motor. Next, a set of residuals is generated by combining the set of current predictions with the measured current values. A set of fault indicators is subsequently computed from the set of residuals and the measured current values. Finally, a determination is made as to whether or not there is an incipient electrical, mechanical, and / or electromechanical fault occurring based on the comparison result of the set of fault indicators and a set of predetermined baseline values.

A fault indicator for indicating the occurrence of a fault in an electrical conductor has a housing, a high capacity battery, a permanent fault display for indicating the occurrence of a permanent fault, a temporary fault display for indicating the occurrence of a temporary fault, a current sensor for sensing the load current in a monitored conductor, a microcontroller for determining when a fault condition occurs and for activating the permanent or temporary fault displays. Preferably, each display includes one or more LEDs. Upon detecting a fault, the microcontroller begins flashing the permanent fault LEDs. After a predetermined interval, the microcontroller again senses the load current. If the current is zero, the fault is permanent and the permanent LEDs continue to flash until a timed reset occurs. If the load current is present, the fault is temporary and the temporary LED is flashed until the timed reset. A light sensor is used to detect nighttime conditions, and microcontroller supplies reduced power to the LEDs at that time. Power to the LEDs is supplied in a repetitive pattern consisting of pulses followed by off time. Related methods are also disclosed.

A fault indicator for indicating the occurrence of a fault in an electrical conductor is automatically configured for an overhead application or for an underground application. The fault indicator has a housing, a battery, a display for indicating the occurrence of a fault, a current sensor for sensing the load current in a monitored conductor, and electromagnetic field sensor to sense the electromagnetic field about the conductor, and a microcontroller for determining whether a fault condition occurred, for determining the magnitude of the electromagnetic field, and for configuring the fault indicator in the overhead configuration if the electromagnetic field is above a predetermined magnitude or configuring the fault indicator for the underground mode if the field is below the predetermined magnitude. In the overhead configuration, voltage inrush restraint is enabled, the fault response time is set within a range of 1 to 50 ms, and the display is operated in bright or dims modes depending upon ambient lighting levels. In the underground configuration, inrush current restraint is enabled, the fault response time is set within a range of 1 to 24 ms, and the display is operated in only the dim mode. Related methods are also disclosed.

The invention relates to the power distribution net monitoring field and provides a real-time state monitoring recognition method for indicator lights of a power device fault indicator. In the method, digital video signals collected by image collecting equipment of a camera, and the like are processed; video frames are extracted from the video signals; monitoring targets are determined, that is the target region of each indicator light in the video frames, and corresponding numbers are distributed; the pixel color change and the intensity roughness of each indicator light in the target regions of two adjacent frames are used for identifying the flash alarming of the fault indicator; specific conditions of faults are determined according to the identified target numbers of the flash alarming and the combinations thereof; the result is real-timely transmitted to a backstage by a distribution communication network to remind working personnel of the fault happening. The real-time state monitoring recognition method realizes the real-time monitoring recognition alarming for the light state of the fault indicator of the power equipment, ensures the reliability of a system, facilitates the installation and the modification of the system and guarantees the safety of installing and maintaining personnel.

A mechanical splice fiber optic connector installation tool operable for performing splice terminations and verifying an acceptable splice termination includes a power source, a connector holder, an integrated Visual Fault Locater having an optical transmission element and a display for displaying the status of the termination. An adapter configured to receive the connector and align the connector with the optical transmission element, such that the optical transmission element is spaced apart from the connector at a predetermined distance and is in optical communication with the connector for propagating light energy through the adapter and along the stub optical fiber to a termination area of the connector.

A method and system for performing reliability analysis of disk drive failure mechanisms is provided. The information for performing the analysis is obtained in accordance with the invention from a database generated from identification information stored about individual drives, and drive families, that are deployed in the field. An error database stores error codes that are issued by a disk drive upon a particular event. These error codes are reported to a storage system administrator and recorded in the error database. The disk drive information and the error codes are mapped, and error codes are translated into failure mechanisms for a particular drive family. An analysis is performed whereby a hazard rate plot is provided for either all failure indicators or selected failure indicators or subpopulations for a particular drive family over a given time.

A local logic solver operates with a local smart valve controller to control and test a local field-mounted emergency isolation valve device to which provide a local indication of trouble on the device, which is mounted in the field away from the facility's central control panel for the process. Accordingly, the operation of the overall system is simplified by eliminating the need for an external computer to diagnose any problems. A local control panel includes an indicator light substantially adjacent to or in close proximity to the device being monitored to alert personnel of detected faults. Detected faults are time-stamped locally to provide documentation and tracking of elapsed time, starting when the degraded state of the device was detected and first signaled as a problem.

A robust alarm system has an alarm controller adapted to input an alarm trigger and to generate at least one alarm drive signal in response. Alarm subsystems input the alarm drive signal and activate one or more of multiple alarms accordingly. A subsystem function signal provides feedback to the alarm controller as to alarm subsystem integrity. A malfunction indicator is output from the alarm controller in response to a failure within the alarm subsystems.

The invention discloses an electric power system 1:1 voltage class distribution network single-phase ground fault simulation test platform. The electric power system 1:1 voltage class distribution network single-phase ground fault simulation test platform comprises a neutral grounding module, a 10 kV bus, a 10 kV pi-type equivalent model electric transmission line module and a single-phase ground fault module. The electric power system 1:1 voltage class distribution network single-phase ground fault simulation test platform can dynamically simulate a single-phase ground fault of an overhead line of different lengths and a cable line of a distribution network in a 1:1 voltage class. The electric power system 1:1 voltage class distribution network single-phase ground fault simulation test platform can simulate different neutral grounding modes, such as neutral ungrounding, neutral low-resistance grounding and neutral grounding through an arc suppression coil; transmission lines of different lengths and different types can be simulated, such as the overhead line or the cable line; single-phase ground faults of various types can be simulated, such as metallic grounding, arc light grounding, high resistance grounding and the like; meanwhile, the electric power system 1:1 voltage class distribution network single-phase ground fault simulation test platform is provided with a distribution network fault indicator, a line selection and fault positioning device and ports of a DTU / FTU and other distribution network automation terminals, and the requirements for scientific researches, product development, product testing and related personnel operating training in directions of the distribution network single-phase ground fault line selection, traveling wave distance measurement accurate positioning and the like are met.

The invention discloses a power distribution network line fault on-line monitoring and alarming system. The system includes a fault positioning software system and a power distribution line fault indicator. The fault positioning software system and the power distribution line fault indicator cooperate. The fault positioning software system includes an intrastation grounding line selection apparatus, a communication front-end processor, an injection signal source and an aerial conductor line fault positioning main station monitoring system. The grounding line selection apparatus and the injection signal source serve to perform single phase grounding fault positioning. The power distribution line fault indicator and a data acquisition concentrator are outrastation apparatuses. The data acquisition concentrator and the power distribution fault indicator form a subnetwork. Among the subnetworks, a monitoring system for a line via the intrastation communication front-end processor is constituted. The fault positioning software system and the power distribution line fault indicator communicate by using cascade via radio frequency. According to the invention, with the cooperation between the fault position software system on a fault line selection host computer and the power distribution fault indicator which has communication function on the line, information which indicates the position and time of the fault can be displayed within minutes of the occurrence of the fault on a geographic information system map of a monitoring center, which facilitates maintenance personnel to head to the site of the fault, eliminate the fault and increase reliability of power supply.

Devices and methods for determining image quality using full-reference and non-reference techniques. Full reference image quality may be determined prior to output of an image or video frame from an image sensor processor by temporarily retaining image data from the image sensor and comparing processed image data of the image to the retained, non-processed image data of the same image. Full reference image quality determination may be assisted by a heuristic-based fault indicator. Image quality may also be determined by a non-reference technique of matching the image to one of various scenarios that are associated with sets of heuristics and applying the heuristics of the particular scenario to the image. Instead of relying on a nominal frame rate, video timing quality may be determined by comparing the capture time interval between successive video frames to the presentation time interval of the same video frames.

A fault detection mechanism for a LED string comprising a plurality of serially connected LEDs, the fault detection mechanism comprising: a control circuitry; and a voltage measuring means, in communication with the control circuitry, arranged to measure the voltage drop across at least one LED of the LED string, the control circuitry being operable to: measure the voltage drop, via the voltage measuring means, at a plurality of times, compare at least two of the measured voltage drops, and in the event the comparison of the at least two voltage drops is indicative of one of a short circuit LED and an open circuit LED, output a fault indicator.

A computer-server rack enclosure fault light diagnostic system and a method for providing an overall rack level fault indicator of a fault incurred by a unit of electronic equipment housed in the rack. The rack may be an EIA standard rack holding constituent components complying with EIA standards.

The invention provides a power distribution network overhead line single-phase grounding fault recognition positioning method and a fault indicator. The power distribution network overhead line single-phase grounding fault recognition positioning method includes the following steps that 1, after a circuit operates normally, the electric field intensity or voltage of the circuit is detected, and if it is detected that the brake variable of the electric field intensity of a certain phase of the circuit or the voltage or the brake variable of the voltage exceeds the set grounding fault threshold value and lasts more than a period of time, a fault early-warning signal is sent out; 2, the current waveforms of the three phases of the circuit are collected synchronously, zero-sequence current synthesis is conducted, and if the circuit zero-sequence current or zero-sequence current brake variable is larger than the set threshold valve, it is judged that the single-phase grounding fault exists in the circuit. By means of the method, the power distribution network overhead line single-phase grounding fault can be recognized and positioned quickly.

A pump monitoring device is configured to be connected to a case drain of a pump. The device includes a manifold having an inlet for connection to the case drain. A flow rate sensor generates a signal indicative of a flow rate of fluid in a fluid path. The flow rate sensor includes a temperature sensor, a heater, and a sensor barrel. The heater heats the sensor barrel while in fluid communication with the fluid. A pressure sensor generates a signal indicative of a pressure of the fluid. There is at least one fault indicator operatively coupled to at least one of the flow rate sensor, the temperature sensor, and the pressure sensor. The fault indicator provides a human perceptible indication that at least one of a sensed flow rate, a sensed temperature, or a sensed pressure of the fluid flowing in the fluid path exceeds a predetermined threshold value.

The embodiment of the invention discloses an insulated gate bipolar transistor-driven protective circuit which comprises a signal transmission circuit, a gate pole driving circuit, a voltage detecting circuit and a blocking time setting circuit, wherein the signal transmission circuit is used for transmitting a driving signal to the gate pole driving circuit; the gate pole driving circuit is used for amplifying the driving signal from the signal transmission circuit, and then driving an insulated gate bipolar transistor to act through the amplified driving signal; the voltage detecting circuit is used for transmitting a fault indicator signal to the blocking time setting circuit once the voltage between a collecting electrode and an emitting electrode of the insulated gate bipolar transistor is detected over a set voltage threshold, wherein the voltage threshold is more than the driving voltage of the insulated gate bipolar transistor; the blocking time setting circuit is used for transmitting a locking signal to the signal transmission circuit after receiving the fault indicator signal from the voltage detecting circuit; and the signal transmission circuit also can be used for blocking and outputting the driving signal to the gate pole driving circuit after receiving the locking signal from the blocking time setting circuit. With adoption of the insulated gate bipolar transistor-driven protective circuit, misinformation of a short circuit fault can be avoided.

The present invention belongs to the power system power distribution network single-phase grounding fault detection technical field and relates to a small-current grounding fault line selection device-based power distribution network grounding fault location method. The method specifically includes the following steps that: (1) a small-current grounding fault line selection device acquires bus-bar zero-sequence voltage and the zero-sequence current of the head end of each line at a fault time point; (2) a fault indicator acquires fault current peak signals and zero-sequence current signals at the fault time point; (3) the small-current grounding fault line selection device selects a fault line; (4) the small-current grounding fault line selection device collects characteristic signals acquired by the fault indicator on the fault line; and (5) and single-phase grounding fault location judgment is performed. With the method of the invention adopted, the single-phase grounding fault of a power distribution network can be accurately located; and the small-current grounding fault line selection device applies transient signal characteristic frequency band line selection theory, and therefore, the line selection accuracy of the small-current grounding fault line selection device can be higher than 98%, and transient signals can be accurately captured, fault analysis and traceability can be realized, and load on-line measurement, statistics and analysis are supported.

The invention discloses a DC injection type route selection positioning system and a method thereof, which makes use of neutral-point voltage to ground to provide power supply for the generation of DC signal and inject DC to a fault system, and realizes faulty route selection and position by the detection of circulation of the DC signals. The structure of the invention comprises a grounding transformer, a DC generator, a control device and a fault indicator FD, wherein, the grounding transformer is connected with a system bus and injects the DC to the fault system by the primary coil of the grounding transformer; the DC generator is arranged between the primary-side neutral-point N of the grounding transformer and the ground; the control device is connected with the secondary side of bus-bar potential transformer to monitor whether a power distribution system has single-phase earth fault, control the switching of the DC, measure the injected DC at the same time and adjust the injected DC according to the measured injected DC; the fault indicator FD is positioned at the outlet of each feeder, and the fault indicator FD is also arranged at the feeder at intervals to detect the injected DC and select faulty line and locate the fault.

A faulted circuit indicator utilizes digitized fault indication curves to determine if a fault has occurred in a monitored conductor. Fault indication curves are intended to be similar to trip curves of common power protection devices, and consist of a plurality of associated fault current levels and fault times. The faulted circuit indicator only displays a fault when the current within the monitored conductor exceeds one of the fault current levels for its associated fault time. This results in more accurate fault detection through the ability to distinguish between small and large amplitude faults coupled with the flexability of a fault indicator suitable for use on many different power systems.

In order to avoid an operator forgetting to actuate locking mechanism interposed between two elements, such as the pod cowls (12, 14) of an aircraft engine, when said elements are in the closed position, use is made of a closure fault indicator. Said indicator comprises retractable abutment members (42, 44) automatically maintaining the two elements spaced from one another in a visible manner, when said elements are moved from their open position into their closed position.

A circuit breaker includes a test circuit having one or two indicators, an arc fault signal generator, and first and second test switches. A first indicator is electrically connected in series with the first test switch. This series combination provides a first alternating current signal to the arc fault signal generator, which provides an arc fault signal to an arc fault trip circuit, in order to trip open separable contacts in response to closure of the first test switch. The series combination of the second test switch and the second indicator provides a second alternating current signal to a ground fault trip circuit, in order to trip in response to closure of the second test switch. The indicators provide a visual indication of failure of the arc fault or ground fault trip circuits to trip in response to closure of the first or second test switches, respectively.

A method and system for early detection of incipient faults in an electric motor are disclosed. First, current and voltage values for one or more phases of the electric motor are measured during motor operations. A set of current predictions is then determined via a neural network-based current predictor based on the measured voltage values and an estimate of motor speed values of the electric motor. Next, a set of residuals is generated by combining the set of current predictions with the measured current values. A set of fault indicators is subsequently computed from the set of residuals and the measured current values. Finally, a determination is made as to whether or not there is an incipient electrical, mechanical, and / or electromechanical fault occurring based on the comparison result of the set of fault indicators and a set of predetermined baseline values.

The invention discloses a fault diagnosis comprehensive positioning method for an intelligent distribution network, and belongs to the field of fault monitoring. Based on a fault indicator, a wirelesscommunication technology and a ground fault line selection technology, the method comprises the following steps: monitoring zero-sequence voltage of a transformer neutral point in real time, startingzero-sequence fault diagnosis when detecting that a zero-sequence voltage change value exceeds a preset value, and identifying whether the zero-sequence voltage change value is a single-phase grounding fault; if the zero-sequence voltage change value is single-phase grounding fault, performing grounding line selection through a fault diagnosis device in a station, and positioning the grounding fault on a certain phase of a certain line; when the single-phase earth fault is judged to be a stable fault, recalling the real-time current data of the fault indicators on the fault phase line, comparing the signals collected by the fault indicators, comparing the difference of the real-time current data before and after a fault point, judging the two fault indicators with abrupt changes, and thendetermining the specific section of the fault. The method can be widely applied to the field of power distribution network operation fault monitoring and positioning.

A local logic solver that operates with a local smart valve controller to control, test and monitor performance characteristics of a local field-mounted emergency isolation valve device, outputting a local indication of trouble on the device, which is mounted in the field away from the facility's central control panel for the process. The local logic solver includes a recording function and memory for retrieval of detected faults that are time-stamped and recorded locally to generate documentation and to track the elapsed time, starting when the degraded state of the device was detected and first signaled as a problem; other performance data is also recorded. Accordingly, the operation of the overall system is simplified by eliminating the need for an external computer to diagnose any problems. A local control panel preferably includes pushbuttons and lights used during routine operations of the valve and a fault indicator light substantially adjacent to or in close proximity to the device being monitored to alert personnel of detected faults.

A non-volatile status indicator switch is provided. In one embodiment, the invention relates to an aircraft electrical system including a fault detection circuit coupled to a relay, and a fault indicator circuit coupled to the fault detection circuit and to a control input of the relay, wherein the fault indicator circuit includes a nonvolatile memory element, wherein the fault detection circuit is configured to detect a fault and to provide a signal indicative of the fault to the fault indicator circuit, and wherein the fault indicator circuit is configured to respond to the signal indicative of the fault by providing a predetermined control signal to the relay and by storing information indicative of the detection of the fault in the nonvolatile memory element.

The invention provides a fault-tolerance and distributed power supply contained power distribution network fault locating method. According to the invention, based on the fault current information uploaded by an FTU (power distribution network feed line terminal) or a fault indicator, the switch fault current information and the line state information are encoded, the line state information is converted into corresponding switch fault current information by defining the switch functions, the advantage and disadvantage degrees of each solution are evaluated by means of target functions, and the optimal solution, namely, the fault position corresponding to the information of the FTU or the fault indicator, is searched by means of a harmony search algorithm. In order to improve the fault positioning speed, the power distribution network is divided into an active branch and a passive branch, and the passive branch having no fault current is not considered during the positioning, the dimension of the solution in the algorithm is shortened, and the positioning efficiency is improved. The method is suitable for the distribution automated power distribution network.