1342results about How to "Improve anti-electromagnetic interference performance" patented technology

The invention discloses a high-speed optical fiber bus based on a command response type high-speed optical fiber bus protocol. The structure comprises an optical fiber bus, a network controller, a plurality of network terminals and a plurality of remote terminals, wherein the network controller is connected to the optical fiber bus, the network terminals are hooked on the optical fiber bus through a plurality of optical fiber couplers, and the remote terminals are connected to the optical fiber couplers through bridging equipment. The invention also discloses a realization method for a redundance topological structure of the high-speed optical fiber bus, which comprises the following steps of: closing an optical link, and detecting the connectivity of the optical link in real time; mutually serving as a backup by reverse double loops, and selecting the other link when one link fails; and utilizing a network monitor as redundance equipment of the network controller. By adopting the invention, the optical fiber bus can meet the requirement of various application environments, such as aerospace and the like for high speed, real time and high reliability, easily isolate single-point failures and support various topological structures, the communication rate can reach 2.5Gbps, wires are convenient to lay, the equipment used by a system is simple, and the reliability is high.

The invention relates to a fiber grating strain and temperature simultaneously measuring sensor. A fiber grating strain sensor is formed by utilizing a second stainless steel pipe to package bare fiber grating, a fiber grating temperature sensor is formed by utilizing a metal pipe to package bare fiber grating, and the fiber grating strain sensor and the fiber grating temperature sensor are packaged in parallel in a first stainless steel pipe by adopting epoxide resin. When the sensor is arranged on an engineering structure, the first stainless steel pipe produces the distortion and transmits the temperature and the strain of the structure to the fiber grating strain sensor at the inner part and the fiber grating temperature sensor without strain influence through the epoxide resin, the measuring value of the strain sensor is compensated by the temperature sensor so as to achieve the simultaneous measurement of the strain and the temperature of the structure.

The invention provides an electromagnetic shielding conformal optical window with a longitude and latitude-shaped mesh structure, which belongs to the technical field of electromagnetic shielding of optical transparent pieces. The electromagnetic shielding conformal optical window comprises a conformal optical window and is characterized in that: (1) a longitude and latitude-shaped metal mesh is manufactured on the inner side surface of the conformal optical window shell; and the longitude and latitude-shaped metal mesh covers the whole inner side surface of the conformal optical window shell; or (2) a longitude and latitude-shaped metal mesh and a conformal optical window inner shell are manufactured on the inner surface of the conformal optical window shell from outside to inside in turn; the longitude and latitude-shaped metal mesh covers the whole inner surface of the conformal optical window shell and outer surface of the conformal optical window inner shell; the latitude-shaped metal mesh consists of metal longitudes and metal latitudes; the metal latitudes are uniformly arranged in an equivalent centre angle along a circumferential direction; the metal longitudes are arranged at equal intervals according to a metal mesh cycle along a generatrix direction; and the metal longitudes and the metal latitudes are electrically connected with one another. The electromagnetic shielding conformal optical window with the longitude and latitude-shaped mesh structure is suitable for electromagnetic shielding technology of military or civil conformal optical windows for remote measuring and sensing, medical diagnosis, secret communication, aerospace equipment and the like.

The invention discloses a control circuit for cookware material judgment and a method thereof. The method comprises the following steps: when an electromagnetic heating device works, a control unit controls an IGBT (Insulated Gate Bipolar Transistor) so as to enable a heating unit to heat; a signal generating unit outputs pulse signals to an MCU (Micro Controller Unit) of the control unit correspondingly according to the on / off state of the IGBT; the MCU records the input pulse signals and converts the pulse signals into frequency M; the frequency M is compared with preset frequency threshold N, and the type of cookware is determined to be A when the frequency M is higher than the preset frequency threshold N; the type of the cookware is determined to be B when the frequency M is less than or equal to the preset frequency threshold N; and the MCU adjusts related heating parameters according to the determined type of the cookware, so as to enable the electromagnetic heating device to adjust a heating state. The control circuit and the method have the advantages that an electromagnetic oven can be adjusted into a working state corresponding to the material of the cookware, the material of the cookware is judged in good time so as to carry out error check, and the like; and the material of the cookware is accurately updated so as to adjust the heating state and increase the heating efficiency.

The invention relates to an apparatus and a method for detecting a partial discharge of a power transformer by utilizing a fluorescence fiber, more particular to a simulation experiment apparatus and a method thereof for a partial discharge of a needle-board electrode in a power transformer. The apparatus provided in the invention mainly comprises: an induction regulator; a dizziness-free test transformer; a partial discharge protective resistance; a standard capacitance voltage divider; a partial discharge generator, which is formed by a needle-board electrode, a fluorescence fiber and a housing; a photomultiplier; a direct current regulated power supply; and an oscilloscope and the like. According to the method provided in the invention, the apparatus is utilized; and a needle-board electrode partial discharge experiment in the air of a power transformer is simulated. According to the invention, partial discharge experiments of a transformer with different exerted voltages and in different spacings are simulated; besides, the apparatus has advantages of strong anti-interference capability, good insulating property and high detection sensitivity and the like. Moreover, the apparatus and the method can be widely applied to luminous characteristic researches of a power transformer on floating potential partial discharge, insulator surface discharge and partial discharge in a transformer oil and an SF6 of a GIS in the air medium.

The invention discloses a three-dimensional laser radar positioning and navigation method for intelligent inspection. The method comprises the steps of S1 acquiring original point cloud data of a to-be-inspected area through a laser radar, and establishing a global point cloud map; S2 converting the global point cloud map into a grid map, and performing global path planning according to preset patrol points to obtain an optimal patrol path; S3 estimating to obtain an initial position, obtaining initial point cloud data of the initial position, and matching the initial point cloud data with theglobal point cloud map to obtain an initial positioning value based on a global map coordinate system; and S4 through matching of the current frame point cloud data obtained in real time and the global point cloud map, obtaining a current inspection pose. As the method is realized by utilizing the three-dimensional laser radar, the functions of three-dimensional perception, autonomous path planning and positioning navigation of the environment can be well realized, and the inspection precision of the inspection robot is improved; GPS positioning navigation does not need to be adopted, and theanti-electromagnetic interference capacity is high.

The invention discloses a capacitance touch detection device; an LC probing loop including an inductive electrode is connected with a touch detection circuit; the touch detection circuit comprises an oscillation control circuit, a frequency detection circuit, an internal resistance detection circuit and a signal processing circuit; the LC probing loop formed by combining the inductive electrode and a sensitive element is connected with the oscillation control circuit; the touch detection circuit is used for probing approach or contact response of the electrode on human body by detecting the resonance frequency and the internal resistance of the LC probing loop. The invention has good capability of anti-water coverage and anti-electromagnetic interference, and can probe the touch action reliably under complicated and rigorous environment.

The invention discloses a quality control device and a method for resistance spot welding based on electrode displacement, which belongs to the technical field of welding. 380V alternating current power supply is added to the input end of a primary loop; under the controllable trigger of an anti-parallel thyristor; the alternating current voltage is reduced by a transformer and the welding energy is switched to a secondary loop; the heavy current acquired from the secondary loop welds workpieces; a spot welding part of the workpiece generates heat expansion and the expansion capacity is measured by an electrode displacement sensing device; a spot welding quality controller collects the displacement measured value of the electrode displacement sensing device and processes the numerical value to acquire the estimation of splashing prevention judgment and nugget size, thus acquiring a welding current control voltage signal and transmitting the signal to a trigger driving circuit; the trigger driving circuit sends trigger pulse to the anti-parallel thyristor to control a conduction angle of the thyristor, thus effectively regulating the welding current and controlling the welding quality. Therefore, the device can solve the real-time monitoring and control problem of the quality of the resistance spot welding well.

The invention relates to the field of flow detection, as an advanced low power consumption two-wire system vortex-shedding meter, comprising a piezo-electric transducer, a differential charge amplifier, a voltage amplifier, a programmable amplifier, a low pass filter, a voltage follower, a band-pass filter set, a band-pass select switch circuit, a peak detection circuit, a wave shaping circuit, asinglechip, a human-computer interface circuit, a 4-20mA output and power management circuit, a constant flow source, a temperature sensor, a pressure sensor, a differential amplifier and a 16-bit analog-to-digital converter. Mini FFT spectral decomposition is used to be combined with the analog band-pass filter set to process signals of a vortex sensor and a multicycle frequency measurement method of precision is used, thereby having temperature and pressure compensating circuit and function, outputting 4-20mA direct current and having two-wire system work. The advanced low power consumptiontwo-wire system vortex-shedding meter has greatly improved measure ratio, measurement precision and capacity of resisting disturbance.

The present invention is cable running safety monitoring method, evaluation method and device, and belongs to the field of cable running safety monitoring technology. The cable running safety monitoring method is to monitor overheat of cable wires and send alarm based on the preset fixed threshold and trend threshold. The cable running safety evaluation method includes recording cable surface temperature, environment temperature and cable current value regularly, establishing cable surface temperature regression model, predicting cable surface temperature trend, and performing the mathematic analysis on the predicted value and the measured value residual error to evaluate the cable running status. The present invention also proposes equipment comprising temperature measuring element, data transmission line, data acquiring circuit module, data converting circuit and computer. The present invention has temperature measuring precision up to 0.5 deg.c, fast storing and other advantages.

The invention relates to the motor technology field, more particularly to an integrated driving motor without a position sensor. The driving motor is provided with a motor; and the motor is composed of a stator, an external rotor, a rotor spindle, and an end cover. The driving motor is characterized in that: a driver is arranged in the motor and is fixedly connected with the end cover; the end cover and the stator of the motor are mutually connected to form an integral body so as to strengthen heat radiation capability of a module; the driver is composed of a power plate and a control plate; the power plate is provided with a major loop, an inlet wire open-phase detection circuit, a bus current detection circuit, an under-voltage and over-voltage detection circuit, a counter-electromotive force detection circuit and a switch power supply circuit; and the control plate is provided with a DSP control system circuit and a communication module circuit. According to the invention, on the basis of the above-mentioned structure, the driving motor has advantages of compact structure, high-density power, high efficiency, low noise, high integrated level, and low cost and the like.

The invention relates to a real-time on-line monitoring apparatus of blade vibration of a flue gas turbine. The monitoring apparatus comprises blade tip timing sensors, an angle reference sensor, a rotating speed synchronization sensor, a preprocessing system, a data integrated processing card, and a computer. The blade tip timing sensors, the angle reference sensor, and the rotating speed synchronization sensor are connected with the preprocessing system that is connected with the data integrated processing card; and the data integrated processing card is connected with the computer. According to the invention, the sensors employ double-shielded capacitance impulsers; single-core double-shielded wires are utilized as transmission lines of output signals; and a driving cable technology is utilized to effectively reduce a random error introduced by an environmental interference; and a charge amplification circuit is used to extract a capacitance pulse signal, thereby eliminating the system error basically and improving the measurement accuracy of the system.

The invention discloses an intelligent integrated online monitoring system and method for underground cable operation. The online monitoring system comprises a monitoring center as well as a cable anti-stealing detection unit, a cable video monitoring unit, a cable joint temperature monitoring unit, a cable metal sheath grounding current monitoring unit, an environment gas monitoring unit, a cable tunnel water level monitoring unit and a cable tunnel smoke monitoring unit which are connected with the monitoring center respectively. According to the system and the method, various sensors and mutual inductors are adopted to monitor cables and cable environments, the monitoring center masters the operation conditions of the cables in real time and gives an alarm when a normal condition happens, a worker is reminded to clear a fault in time, and large potential safety hazard is avoided; with the adoption of anti-stealing monitoring, the possibility of stealing of the cables is eliminated, in combination of video monitoring, the missing report caused by visual fatigue is prevented, one all-weather dead-zone-free monitoring platform is established, so that visual monitoring of important positions in cable tunnels is realized, manual inspection is replaced, the labor cost is reduced, the time is saved, further, videos can be stored and taken, and later maintenance is facilitated.

The invention belongs to the technical field of electric power equipment on-line monitoring, and in particular relates to a transformer substation capacitor on-line monitoring method and device based on a wireless mode, wherein the method mainly comprises the following steps: designing and additionally arranging a self-electricity-supplying current measuring unit at the high-voltage side of each capacitor, additionally arranging a self-electricity-supplying voltage measuring unit at the secondary side output end of an electricity discharge PT (potential transformer) of each group of parallel capacitors, acquiring the working voltage and current of each capacitor, and sending the obtained working voltage and current of each capacitor wirelessly to a monitoring base station; monitoring an internally-built computer and a wireless module of the base station; sending a capacitor voltage and current synchronous sampling starting conversion command, receiving, storing and managing measurement data, calculating the capacitance and medium loss of each capacitor by utilizing spectrum analysis, sending the calculated result to a monitoring host machine of a remote monitoring center for comprehensive estimation and analysis, and giving out a fault alarm for the capacitors with the variation greater than a certain value.

The invention relates to a method for monitoring steel bar corrosion state in concrete by stages and a sensor, and belongs to the field of tests of civil engineering sensors. The method comprises two stages for monitoring the steel bar corrosion state, namely an initial stage of steel bar corrosion for monitoring Cl content and a stage for monitoring the content of liquid rust nearby the steel bar during rusting; therefore, the method prolongs the effective working time of a steel bar corrosion sensor. The sensor comprises a sleeve, a fiber bracket and an LPFG sensing probe, wherein the sleeve is provided with a hole; the fiber bracket is arranged in the sleeve; the LPFG sensing probe is freely and straight arranged on the fiber bracket; and a monitoring medium is filled in the sleeve.

The invention discloses a mobile field partial discharge source visual detection method for a GIS (gas insulated switchgear), which comprises the following steps of: firstly performing the partial discharge source detection on a GIS by using an ultrasonic and ultra-high frequency detection method, then performing the visual location on a partial discharge source in the GIS by using an X-ray digital imaging detection method; meanwhile, determining a partial discharge source in the GIS by using the ultrasonic and ultra-high frequency detection method; and then using the X-ray digital imaging detection method to visually show the specific position of the partial discharge source in the GIS in a region where the partial discharge source is discovered by using the ultrasonic and ultra-high frequency detection method. The partial discharge source in the GIS can be rapidly and visually located without detaching the device and cutting off power; therefore the mobile field partial discharge source visual detection method can be movably used in the same field and different fields, has the outstanding advantages of mobility, high efficiency and reliability, and can visualize the fault or defect partial discharge position.

The invention is the monitoring and judging method of safe running of the cable and its equipment. The characteristics are: the said monitoring method through the pre-set fixing threshold and trend threshold sends the alarming information of the overheating situation of the cable core in time; the said judging method is according to the cable surface temperature, the ring temperature and the current value automatically stored to establish the cable surface temperature regression model and forecast the operation trend of the cable surface temperature and promote the judgment through the mathematical analysis of the difference between the forecasting value and the tested value. The invention also provides the device composed of the corresponding thermometric component, the data transmitting wires, the data collecting circuit assembly, the data converting circuit and the computer. The invention has fast storing performance, timely monitoring and stable judging.

The invention discloses a detection system and a detection method of petroleum-type pollutants. The detection system comprises an emitting unit, a receiving unit, a reference unit and a signal processing unit. The emitting unit is used for emitting laser signals, and transmitted light signals and reflected light signals are outputted; an input terminal of the reference unit receives the transmitted light signals emitted from the emitting unit. An output terminal of the reference unit is connected to an input terminal of the signal processing unit. Reference signals outputted by the reference unit are transmitted to the signal receiving unit by the output terminal of the reference unit. A sample in a sample tank is excited by the reflected light signals, such that fluorescence signals are generated. The fluorescence signals are received by the receiving unit beside the sample tank, and are outputted to the signal processing unit by the receiving unit. The fluorescence signals are processed by the signal processing unit. The system and the method provided by the invention are based on laser-induced fluorescence detection principles. Emitted signals are modulated by using a modulation technology, such that the detection sensitivity of the system is high. With the method and the system, rapid, real-time, on-line and non-contact measuring upon water body petroleum-type pollutant fluorescence signals can be realized. The system and the method can be widely applied in water body environment monitoring.

The invention relates to an electric automobile power battery management system and method. The electric automobile power battery management system comprises a battery information detection module, a central processing module, a logical switch array switching module and a power module, wherein the battery information detection module can be used for detecting the voltage of each battery monomer; the central processing module is used for receiving the voltage of each battery monomer detected by the battery information detection module, comparing all voltages in the detection result, calculating an average voltage value and finding out the battery monomer the voltage of which is lower than the average voltage value and is the lowest in a battery set; the battery monomer the voltage of which is lower than the average voltage value and is the lowest in the battery set is conducted with the logical switch array switching module by the central processing module; and the power module is used for supplying power for the central processing module and charging the battery monomer the voltage of which is lower than the average voltage value and is the lowest in the battery set. With adoption of the electric automobile power battery management system, the charging power of a battery can be accurately controlled, and the charging efficiency is high.

The invention provides a monitoring device and a monitoring method for a mining FBG roof separation layer. The device comprises a vertical measurement barrel and a packaging casing, wherein fixed pulleys, tape pulleys and constant-strength cantilever beams are symmetrically arranged in the packaging casing; a steel wire rope penetrates through the tape pulleys and the fixed pulleys and penetrates out from a steel wire rope guide hole in the top part of the vertical measurement barrel; one end of the steel wire rope is connected with an anchor head; a shallow part measurement point and a deep part measurement point are distributed inside a drill hole; the anchor head is pushed to the measurement points in the drill hole; when the stress of the steel wire rope changes, the stress change is displayed through wavelength values of an FBG A and an FBG B; a wavelength demodulation device is used for demodulating the wavelength values into digital signals, the digital signals are sent to a computer for real-time processing, and a separation layer numerical value is combined for drawing a separation layer quantity changing curve and a set separation layer boundary value; whether the separation layer exists is judged; and the data change of the roof separation layer is monitored in real time. Temperature compensation is performed with a differential form, on-line measurement of the roof separation layer is realized, the reliability and the accuracy are high, an early warning signal can be issued, and roof fall accidents can be avoided.

The invention discloses a vehicle running monitoring system based on a fiber grating, which consists of an indoor sub-system and an outdoor sub-system. The indoor sub-system comprises an optical module, a sensing signal demodulating module, a business calculating module and a business interface module. The four modules are connected with each other in sequence; the outdoor sub-system comprises a transmission cable, sensor units and a roadside maintaining device; the sensor units are arranged on a steel rail and are connected with the roadside maintaining device; the transmission cable is connected with all the sensor units; the optical module in the indoor sub-system is connected with the transmission cable led into indoor by the outdoor sub-system. The vehicle running monitoring system based on the fiber grating can dynamically monitor the vehicle running parameters like the running state of a wheel rail, the occupied space of the rail, the running speed, the weight, and the like. Besides, the vehicle running monitoring system of the invention has the advantages of high safety, low energy consumption as well as convenient and fast mounting and maintenance.

The invention discloses a high-power marine shore power supply which comprises electric fence high pressure three phase AC input, power supply high pressure three phase AC output and an inverter system; wherein, the inverter system is a high pressure inverter system which directly rectifies and inverts high tension electricity of the electric fence three phase AC input and then outputs high pressure three-phase alternating current, thus reducing the intermediate transforming links as well as improving the power factor of the power supply and the reliability of the products.

The invention belongs to the fields of mine fire prevention and explosion prevention and fire pre-warning safety monitoring, and relates to a high-precision optical fiber composite cable intelligent monitoring platform which is the key for protecting safety operation of optical fiber composite cables. The platform comprises a distributed optical fiber temperature measuring system, a cable heating temperature control system, an optical fiber measured temperature calibration system, a local discharge online monitoring system, a data exchange system and an upper computer. The intelligent monitoring platform integrates the distributed optical fiber temperature measuring system, the cable heating temperature control system, the optical fiber measured temperature calibration system, the local discharge online monitoring system and the data exchange system, overcomes defects in the prior art, gives full play of the advantages that the safety and reliability are good, temperature measuring and positioning precision is high, the anti-electromagnetic-interference capacity is high and the operation temperature and local discharge of the optical fiber composite cables are continuously monitored in real time on a large scale, gives full play of the transmission capacity of the optical fiber composite cables, reduces the operation cost, and achieves the diversified goals of engineering security application and experiment simulation and precise prediction.

The invention discloses a method for battery module address assignment of a battery energy storage system. The battery energy storage system comprises a master control module and a natural number of battery modules. Each of the battery modules comprises a slave control module and a battery, and the mater control module and the slave control module are both connected to a field bus. The method comprises the steps of monitoring the battery modules, calculating the number of the batteries, assigning a first address, judging the steps and assigning an Nth address. The method disclosed by the invention has the following remarkable beneficial effects: (1) the field bus adopted by the method is a can bus, thereby having the advantages of high real-time performance, long transmission distance, strong anti-electromagnetic interference capacity and the like; (2) the improvement is based on an existing CAN network topology and hardware structure, thereby being low in popularization cost and high in feasibility; (3) the method has dual mistake proofing functions in the process of address assignment; and (4) the method does not need human participation, reduces misoperation, saves the labor cost, and improves operation experiences if the technology is applied to electric automobiles.

The invention discloses a wind-field communication network with double-loop redundancy, which includes a communication and monitoring station of the fan controller, wherein the wind-field looped network is comprised among the fans. The wind-field looped network applies the optical fiber looped network of the topological structure with the double-loop self-healing policy, which comprises the following parts: a fiber channel data code, a communication protocol, an MCU hardware module, an Ethernet hardware module, a fiber interface module, a CAN module, the other communication interface module and a power module, wherein the monitoring station remotely accesses the operation state of every fan directly by the Ethernet hardware module, the communication controller of every fan is connected with the fiber network of the wind field by the fiber interface module and communicates with the other fans and the master communication controller, CAN module communicates with the other controller of the fan provided double CAN by the interior of MCU hardware module, MCU hardware module sends the data and the order to the wind-field looped network by the fiber interface module according to the corresponding communication protocol or the other controller in the fan by CAN module after calculating and judging the received communication data and the data of the sensor. The topology network structure of the invention is provided with the short cable, which is fit for fiber and error transmission; the fiber network transmission media of the invention is provided with the high transmission efficient, the long distance, the strong electromagnetic anti-interference ability; the double-loop network structure of the invention achieves the self-healing function of the network; the DNP 3.0 regulation in the total wind-field communication dissolves the broadcast storm problem.

The invention relates to a digital microwave transmission device and a digital microwave transmission method. The device comprises a main unit and a remote unit which are arranged at each station. The main unit and the remote unit at one station are connected through an optical fiber cable. Remote units between two stations are wirelessly connected. Each main unit comprises an interface processing unit, a main transmission link, a main receiving link, a main wavelength division unit and a remote control unit. Each remote unit comprises a remote wavelength division unit, a remote transmission link, a remote receiving link, a duplexer unit and an antenna unit. The main unit adopts digital modulation-demodulation and shaping filtering to convert user digital signals into optical signals which are transmitted through optical fibers. After the optical signals reach the remote unit, the optical signals are restored to radio-frequency signals which are converted into wireless signals through power amplification for transmission. The device provided by the invention has the advantages that the transmission distance is long, the cost is low, the main functions are completed on the main units, the power consumption of the remote units is low, and the problems that the transmission through optical fibers at complex terrains is inconvenient to realize and the loss of long-distance wireless transmission is great are solved.

An electrical connector assembly includes a first electrical connector and a second electrical connector mated with each other. The first electrical connector includes an insulative housing, a plurality of conductive terminals and a grounding plate. The insulative housing extending along a longitudinal direction includes a base portion and a plurality of side walls extending forwardly from the base portion and forming a mating cavity. The insulative housing defines a plurality of first passageways and second passageways separately formed in two opposite side walls thereof communicating with the mating cavity. The conductive terminals include a plurality of first terminals and second terminals received in the corresponding first and second passageways. Each of the first and second terminals has a contact portion extending into the mating cavity. The grounding plate is disposed between the first and second terminals and defines at least one pressing portion located in the mating cavity.

The invention belongs to the technical field of electric-power equipment detection, and in particular, relates to a detection device of dissolved gases in transformer oil based on infrared spectrum absorption. The device includes a light source system unit, a sensing arrangement unit and a detection acquisition and analysis unit; the light source system unit is composed of a high-power supercontinuum broadband light source, a light source controller and a photoswitch and is used for realizing output multiplexing control of the light source; the sensing arrangement unit is formed by arranging one sensing path of fiber Bragg grating hydrogen sensor series-connection wavelength division multiplexing and the other one sensing path of hollow photonic crystal optical fiber internal spectrum absorption sensing in a cavity body of an oil-immersed power transformer; the detection acquisition and analysis unit is composed of a wavelength demodulation device, a light intensity detector and a data acquisition and analysis device, the wavelength offset and the spectral absorption intensity of fiber Bragg grating hydrogen sensors are detected, and the data acquisition and analysis device records data and types and contents of corresponding fault gases are obtained by calculation; and on the basis, insulation conditions of the transformer oil are evaluated, positioned, analyzed and forecasted.

The invention relates to a system and a method for monitoring vibration of a circuit breaker, and in particular relates to an acceleration sensor-based system and an acceleration sensor-based method for monitoring vibration of a circuit breaker. The system comprises a resonance type wireless passive voice surface wave acceleration sensor, a reader, a semiconductor temperature sensor, a switching value state sensor and a host computer, wherein the acceleration sensor is arranged nearby a vibration source of a key part of the circuit breaker; the reader is arranged at a position not more than 2m away from the acceleration sensor; the semiconductor temperature sensor is arranged on the surface of the reader; the switching value state sensor is arranged on the circuit breaker; the reader is in communication with the host computer through a serial port and an Ethernet interface. The system disclosed by the invention adopts the wireless passive voice surface wave acceleration sensor to measure vibration signals of the circuit breaker, the monitored data are transmitted in a wireless mode, and the semiconductor temperature sensor is used for realizing temperature compensation of the acceleration sensor; the acceleration sensor has the advantages of being purely passive, free from maintenance, convenient to install and high in safety.

The invention relates to an arc fault detection device which comprises a power module, a signal acquisition processing unit, a central processing arithmetic unit and a control output unit capable of controlling power connection and disconnection of a load. The central processing arithmetic unit identifies arcs through a load arc feature library, a load arc type analysis module and a load arc judgment module, and outputs a control signal to the control output unit to control the connection and disconnection of a load circuit. By means of the arc fault detection device, the problems that an arc detection device in the prior art cannot distinguish load characteristics in a loop and cannot sufficiently identify the arcs in the loop are effectively avoided. The arc fault detection device and a detection method of the arc fault detection device can be adjusted automatically according to the characteristics of the arcs and can sufficiently identify the arcs.