11216results about "Testing dielectric strength" patented technology

A system and method for detecting the potential of non-cathode arcing in a plasma generation apparatus, such as a physical vapor deposition chamber. The system and method involve computing a statistical parameter of cathode-arcing event data in the chamber and performing a pattern recognition technique to a moving average of the statistical parameter.

A method and apparatus for managing DC arc faults. At least a portion of the method is performed by a controller comprising at least one processor. In one embodiment, the method comprises analyzing a signature of a signal of a power converter and determining, based on analysis of the signature, whether an arc fault exists.

The invention is directed to a method and a device for detecting fault current arcing in electric circuits for consumers with relatively constant power consumption, particularly in onboard aircraft power supplies. The object of the invention is to find a novel possibility for detecting arc faults in electric lines of consumers with a relatively constant power consumption which appreciably reduces erroneous triggering of safeguards without compromising the reliability of switching off in the event that arcing actually occurs. This object is met, according to the invention, in that a voltage value is measured simultaneous with the current measurement, a ratio is formed of the current measurement values and voltage measurement values that are detected in parallel, and an indicator signal is generated for detected arcing when changes in the ratio of current measurement values and voltage measurement values exceed a predetermined threshold value.

A method and apparatus for managing DC arc faults. At least a portion of the method is performed by a controller comprising at least one processor. In one embodiment, the method comprises analyzing a signature of a signal of a power converter and determining, based on analysis of the signature, whether an arc fault exists.

Method and apparatus for detecting or suppressing electrical arcing or other abnormal change in the electrical impedance of a load connected to a power source. Preferably the load is a plasma chamber used for manufacturing electronic components such as semiconductors and flat panel displays. Arcing is detected by monitoring one or more sensors. Each sensor either responds to a characteristic of the electrical power being supplied by an electrical power source to the plasma or is coupled to the plasma chamber so as to respond to an electromagnetic condition within the chamber. Arcing is suppressed by reducing the power output for a brief period. Then the power source increases its power output, preferably to its original value. If the arcing resumes, the power source repeats the steps of reducing and then restoring the power output.

A method and device for predicting defects of a capacitor, the method including determining the ripple voltage (Udc), the temperature (TP), and the current (Ic) of the capacitor, determining the value of an equivalent series resistance (ESR) of the capacitor, and the capacitance value (C) of the capacitor using a digital filter, determining information representative of the state of aging of the capacitor according to the temperature of the capacitor, and displaying that information and information representative of the value of the capacitance (C) and / or information representative of a cause associated with the state of aging according to the capacitance value. The device may include a converter and an uninterruptible power supply.

System for monitoring an electrical system of a facility includes one or more local sensing devices, each of which is adapted to be connected to the electrical system of the facility in proximity to a respective load that receives power from the electrical system so as to make local measurements of a voltage across the load continuity measurements of electrical-power presence at one or more points in the electrical system of said facility. A processing unit is adapted to receive and compare the local measurements to reference measurements of the voltage supplied to the facility, in order to detect a fault in the electrical system.

A method and system for performing continuous (real-time) physics based prognostics analysis as a function of actual engine usage and changing operating environment. A rule-based mission profile analysis is conducted to determine the mission variability which yields variability in the type of thermal-mechanical loads that an engine is subjected to during use. This is followed by combustor modeling to predict combustion liner temperatures and combustion nozzle plane temperature distributions as a function of engine usage which is followed by off-design engine modeling to determine the pitch-line temperatures in hot gas path components and thermodynamic modeling to compute the component temperature profiles of the components for different stages of the turbine. This is automatically followed by finite element(FE) based non-linear stress-strain analysis using an real-time FE solver and physics based damage accumulation, life consumption and residual life prediction analyses using microstructural modeling based damage and fracture analysis techniques.

The invention discloses an unmanned helicopter system for patrolling trolly wire routes and towers and a method thereof. The unmanned helicopter system adopts an unmanned helicopter carrying a detection device, a control device and a communication device, and patrols the trolly wire routes and the towers along a trolly wire route passage. The method can cope with complex and changeable surface features to finish detecting the defects of the devices of the trolly wire routes and the towers. The structure of the unmanned helicopter system comprises an unmanned helicopter, a remote controller and a ground control car, wherein, the unmanned helicopter is provided with a flight control system and a patrolling detection system; the two systems are both wirelessly communicated with the ground control car; the ground control car remotely carries out remote control for the unmanned helicopter and analyzes and processes patrolling detection results.

The invention relates to a local discharge electroacoustic united detection positioning system and a positioning method thereof in the technical field of electric power systems. The local discharge electroacoustic united detection positioning system comprises a plurality of sensing and amplifying modules, a front end detection module and an industrial control module, wherein the sensing and amplifying modules are arranged on a GIS casing cavity body to be tested and are connected with the front end detection module for outputting amplifying signals, the front end detection module carries out synchronous signal collection on a plurality of paths of input amplifying signals and outputs the amplifying signals to the industrial control module, and the industrial control module outputs a control command to the front end detection module. The invention concentrates the advantages of an ultrahigh frequency detection method and an ultrasonic detection method, discovers the defects of insulation matching and the like possibly existing in the installation process of the GIS in time, enhances the acceptance check accuracy and ensures the safe and reliable power supply of an electric power system.

The invention relates to an evaluation system of transformer state based on multisource information integration and an evaluation method thereof, wherein, the evaluation system in the invention is composed of an oil chromatographic analysis subsystem, a partial discharge ultrahigh frequency signal detection subsystem, a winding deformation vibration signal detection subsystem, a current transformer detection subsystem and a computer; the technical point of the evaluation method in the invention lies in evaluating the running state of a detected transformer by fusing the detection results obtained by the detection methods utilized by the four detection subsystems by utilizing a D-S evidence theory fusion evaluation algorithm. The beneficial effects of the invention lie in being capable of timely discovering and accurately judging the malfunction of transformer and comprehensively reflecting the running state of a transformer.

The invention is directed to a method and a device for detecting fault current arcing in electric circuits for consumers with relatively constant power consumption, particularly in onboard aircraft power supplies. The object of the invention is to find a novel possibility for detecting arc faults in electric lines of consumers with a relatively constant power consumption which appreciably reduces erroneous triggering of safeguards without compromising the reliability of switching off in the event that arcing actually occurs. This object is met, according to the invention, in that a voltage value is measured simultaneous with the current measurement, a ratio is formed of the current measurement values and voltage measurement values that are detected in parallel, and an indicator signal is generated for detected arcing when changes in the ratio of current measurement values and voltage measurement values exceed a predetermined threshold value.

Some embodiments can concern an apparatus configured to detect an electrical state of one or more electrical devices. The one or more electrical devices are coupled to an electrical power infrastructure and generate one or more high-frequency electrical signals on the electrical power infrastructure. The apparatus can include: (a) a processing module configured to run on a processor of a computational unit; and (b) a sensing device configured to be coupled to an electrical outlet. The sensing device can have: (a) a data acquisition receiver configured to receive the one or more high-frequency electrical signals via the electrical outlet and convert the one or more high-frequency electrical signals into one or more first data signals when the sensing device is coupled to the electrical outlet. The electrical outlet can be electrically coupled to the electrical power infrastructure. The sensing device is in communication with the computational unit. The processing module is further configured to identify the electrical state of the one or more electrical devices at least in part using the one or more first data signals. The high-frequency electrical signals comprise electrical signals in the ten kilohertz to three megahertz range. Other embodiments are disclosed.

In the inverter device of the invention, when a power source connected to an electrolytic capacitor 5 is interrupted, a switching control circuit 6a controls switching elements of an inverter main circuit 7a to operate to supply a current to a load, thereby discharging charges of the electrolytic capacitor 5, and an electrolytic capacitor electrostatic capacitance calculator 10a calculates the electrostatic capacitance of the electrolytic capacitor, on the basis of: a discharged charge amount which is obtained from an outflow current Ic from the electrolytic capacitor 5, and a discharge time; and a discharge voltage ΔV which is a voltage drop from beginning of discharging of the electrolytic capacitor 5.

The invention provides an integrated testing device used in local discharge detection for oil immersion power transformer paper oil insulation electric heating ageing study, comprising an electric heating ageing oven, a test object electrode system and a high-voltage alternating current power supply system. The test object electrode system is arranged in the electric heating ageing oven and connected with the high-voltage alternating current power supply system. The testing device also comprises a local discharge signal acquisition system which comprises a local discharge signal transducer, a signal transmission cable and a data acquisition processing device. The input end of the signal transducer is connected with the test object electrode system, the output end is connected with the data acquisition processing device through the signal transmission cable; the testing device can acquire the local discharge parameter in the electric heating ageing process of paper oil insulation, provides data for the electric heating ageing study and can further realize the on-line monitoring of transformer paper oil insulation electric heating ageing state on the basis of the study.

The present invention relates to an apparatus capable of diagnosing the aging state of a power conversion system at ordinary times and its diagnosing method to ensure the reliability of a power conversion system. The apparatus includes a current sensing means for detecting the output current of a inverter switching module or an electrolytic capacitor, and measurement and diagnosis means for extracting elements related to the aging status of the power conversion system by receiving the output current waveform of the inverter switching module and magnitude of each harmonic or an impedance voltage signal of the electrolytic capacitor. Furthermore, it is preferable that the apparatus further includes a measurement current generation means for generating measurement current to be supplied to the electrolytic capacitor. By analyzing an average value or the magnitude of harmonics by FFT analysis of the output current waveform of the inverter switching module and measuring an ESR value or a loss angle tan δ of a DC bus of the power conversion system, the present invention is able to monitor and diagnose the abnormal state attributable to the aging or degradation of the power conversion system in advance.

This invention relates to gas insulation combination electric apparatus partial discharge online detecting and position equipment and its position method. It belongs to electric equipment insulation detecting technique field. This invention includes sensor array consisted by microtrip patch antenna, two groups multiple intelligence selecting switch; two amplify filter, high speed digital collector, computer and control module. The array in this invention is made up by the microtrip patch antennas fixed at GIS basin type insulator, its antenna is made up by rectangular metal patch, medium board, metal platter, coaxial probe type feed line and antenna shielding case. This invention is computer program control, it can online, actual time, quickly, actually poison of GIS inner discharging. This invention can be widely used to electric generator plant booster station and electric network GIS electric substation, it can auto detecting GIS inner partial discharge, and actually poison of partial discharging defect, also it can interconnection run with electric substation and electric generator plant auto monitoring system.

A pressure transmitter having a capacitance-to-digital modulator produces an output as a function of sensor capacitance and a reference capacitance. Transmitter also includes a sensor failure mode detector produces an output signal and identifies failure modes of the sensor capacitance and reference capacitance.

The invention discloses a method for evaluating the aging degree of main insulation of a transformer. The method comprises the following steps of: firstly measuring a complex capacitance frequency domain spectrum C*(ohm) and an oil conductivity sigma of the main insulation of the transformer on the scene, collecting structure parameters of the main insulation of the transformer and transmitting the structure parameters to a data processing device; subsequently calculating the complex capacitance frequency domain spectrum so as to obtain a medium loss factor frequency domain spectrum of a main insulation paper board of the transformer; and finally evaluating the state of the main insulation of the transformer by adopting frequency domain-based dielectric characteristic parameters. The method considers the influence of multiple factors such as measuring temperature, a main insulation structure, and oil conductivity, and has wide applicability to an oil-immersed transformer; the defects in a traditional chemical and electric method are compensated; the moisture content of the main insulation of the transformer can be diagnosed, and meanwhile the aging state of the insulation can be evaluated; and moreover the method can be used for on-site diagnosis directly, and has the advantages of lossless, convenience, transplantation and the like.

Disclosed is a UHF partial discharge and its location measuring device for high-voltage power devices. The measuring device includes a partial discharge sensor, an external noise sensor, an analogue-digital converter, a peak detector, a partial discharge signal processor, an arrival time detector, a discharge location processor, and a display unit.

The simulating experiment equipment for local discharge in gas insulated combined electric appliance consists of inducing pressure regulator, no-corona experiment transformer, no-local discharge protecting resistor, standard capacity voltage divider, GIS simulating experimental device, internal UHF antenna sensor and external UHF antenna sensor, microstrip line filtering amplifier, intelligent UHF multiplexer, wide band high speed ultrahigh capacirty digital storage oscilloscope and microcomputer. The simulating experiment equipment and method for local discharge in gas insulated combined electric appliance may be used for simulating various defaults inside GIS to obtain PD experiment data reflecting various kinds of insulation defaults and distinguish the PD modes of the insulation defaults in GIS, so that the present invention may be used widely in relevant theoretical analysis and application research.

There is here disclosed a method and apparatus for detecting the occurrence of arcing of a conductor by monitoring the current on an AC power line. The signal detected is split and directed along four separate paths to generate four signals having separate characteristics which represent the current in the line. A first path is for a signal representative of the current flowing in the line. A second path is for a signal having a pulse for each occurrence of a positive step change in current that is significant and has a di / dt value above a predetermined value. A third path is for a signal having a pulse for each occurrence of a negative step change in current that is significant and has a di / dt value above a predetermined value. A fourth path is for a signal having a voltage level representative of the broadband noise signal on the line. Using at least one of five different methods in combination with one of three input signals, a reference signal designated as "SINE" is generated. The SINE signal generated in combination with a CURRENT input is used to produce a control waveform "DELTA". DELTA can be represented as a relative value or as an absolute difference between the SINE and the CURRENT. Each occurring half cycle of the DELTA signal is analyzed by, for example, a micro-controller for specific identifiable characteristics found to indicate the presence of arcing. Upon the detection of arcing, an output signal can be generated to activate a circuit interrupting mechanism, sound an audio alarm and / or alert a central monitoring station.

The invention relates to a self-walking underground cable failure detection intelligent instrument which comprises an underground cable hot failure infrared detector 1. an underground cable partial discharge ultraviolet detector 2. an underground cable insulation aging electric field distribution detector 3. an underground cable self-walking patrolling robot 4 and an underground cable failure predication system 5. The self-walking underground cable failure detection intelligent instrument realizes the comprehensive detection and prediction on the underground cable failure based on the multi-sensor detection, multi-information amalgamation, and movable intelligent patrolling mode, has high degree of automation as well as full-size, intuitive and reliable information, and greatly lightens the working load and working intensity of personnel.

A method and apparatuses detect arc faults. The apparatus according to one embodiment comprises: a master node (111) for digitally detecting a current signal and a voltage signal at a first point in a wiring system (131); a slave node (122) for digitally detecting a current signal and a voltage signal at a second point in the wiring system (131); and a detection unit for detecting an arc fault in the wiring system (131) by comparing the current signals from the master node (111) and from the slave node (122), and comparing the voltage signals from the master node (111) and from the slave node (122).

The invention relates to a large multifunctional environmental simulator for electrical tests, which comprises an environmental stimulation chamber and is characterized in that an air heat-exchange circulation system and an ice-melting system are arranged in the environmental stimulation chamber; and the environmental stimulation chamber further comprises an ice-coating, rain-exposing and ultrasonic-atomizing system, a water treatment system, a heat-fogging system, a cooling water circulation system, a refrigeration system, a vacuuming and defogging system, a measurement and control system and an ultra-high voltage power supply system for providing a high-voltage charging state for test-pieces. By achieving the skillful coordination among the systems and the uniform operation control by the measurement and control system, the large multifunctional environmental simulator integrates various testing functions of environmental simulations, such as high-altitude, ice-coating, contamination, rain-exposing and other simulations into a whole. Therefore, the invention is widely suitable for the testing process for large multi-parameter environmental simulations.

The invention provides a method for testing the electromagnetic compatibility (EMC) of an electrically-driven automobile. The electromagnetic interference of the electrically-driven automobile is different from that of the common internal combustion engine automobile, as far as the work principle of the electrically-driven automobile is concerned, the electrically-driven automobile has stronger electromagnetic disturbance property and higher anti-electromagnetic interference due to the application of a large-scale electronic system, the electrically-driven automobile is arranged on a loaded chassis dynamometer and runs on the chassis dynamometer at specific speed, the chassis dynamometer realizes energy absorption, and the electromagnetic compatibility of an automobile in a running state is evaluated from two angles of automobile electromagnetic interference (EMI) and automobile electromagnetic susceptibility (EMS), thereby when the automobile normally runs, the electromagnetic interference of the automobile can be accurately measured.

The invention relates to an experimental facility and method for electric heating combined stress aging with oil-paper insulation of a transformer, wherein the facility has the advantages of simple structure and good use effect, is safe in running and convenient in sampling. The experimental facility comprises an outer cavity which is internally provided with at least one sealed inner cavity; theinner cavity is internally provided with a testing device which is provided with a high-voltage electrode and a low-voltage electrode; a sample is arranged between the high-voltage electrode and the low-voltage electrode which are mutually pressed; and the high-voltage electrode is connected with a high-voltage power supply and a current measurement and display system outside the outer cavity respectively.

A system and method for managing power delivered to a processing chamber is described. In one embodiment power is delivered to the processing chamber with a power cable, the power cable storing energy and including a first and second conductors, the first conductor having a first voltage polarity relative to the second conductor. The voltage polarity of the first conductor is reversed relative to the second conductor and at least a portion of the stored energy in the power cable is provided to the plasma chamber while the polarity of the first power cable is reversed.