318results about How to "Little external interference" patented technology

The invention provides a full-automatic chemiluminescence immunoassay analyzer. The full-automatic chemiluminescence immunoassay analyzer comprises an operation control main body and a computer connected to the operation control main body. The operation control main body comprises a reagent sample module, an incubation module, a cleaning module and a detection module. The reagent sample module comprises a reagent sample tray and a sample arm between the reagent sample tray and the incubation module. The incubation module comprises a reaction disc and a reaction cup loading platform matching the reaction disc. The cleaning module comprises a cleaning disc and a cleaning device related to the cleaning disc. The detection module comprises a detection disc and a detection device related to the detection disc. The full-automatic chemiluminescence immunoassay analyzer realizes sample loading, incubation, cleaning and detection combination, and the reagent sample tray temperature is controlled so that reagent refrigeration is realized and work efficiency is improved; the detection disc temperature is constant by control so that a detection precision is improved; a structure design is reasonable so that operation is convenient and reagent, sample, substrate and waste replacement is convenient; and the full-automatic chemiluminescence immunoassay analyzer adopts a table-type design so that the structure is compact and an occupation space is reduced.

The invention proposes a dangerous driving behavior real-time detection method based on deep learning, and the method comprises the steps: building a front car image collection system, collecting a training sample, carrying out the manual marking, and building a dangerous driving behavior data set; proposing a spatial pyramid pooling convolution depth confidence normalized classification network (SPP-CDBRNet) model according to the characteristics of the dangerous driving behavior data set based on a deep learning method; carrying out the preprocessing of the built data set, carrying out the training of the SPP-CDBRNet model through a random gradient descent method with a momentum and the data set after preprocessing, and obtaining an SPP-CDBRNet which precisely recognize whether there is a dangerous driving behavior (behaviors of using a cellphone and smoking during driving); carrying out the detection of a front car image through the determined SPP-CDBRNet model, and achieving the real-time detection of the dangerous driving behavior. The method can effectively improve the detection precision of dangerous driving behaviors, is good in instantaneity and mobility, and is good in application prospect.

The invention relates to a rotary multi-contact corrosive wear testing apparatus, comprising a servo motor, a fixture, a reaction container, an electrochemical test system, a loading device and a fluid impact system. The fixture is connected with a transmission shaft of the servo motor and rotates around the axis of the transmission shaft, the fixture is fitted with a specimen, and the fixture drives the specimen to rotate while rotating; a working electrode is placed in a reaction tank and reacts with the specimen for corrosive wear reaction, and a loading system comprises a loading table, a linear bearing, a pressure sensor and a hydraulic cylinder; the fluid impact system comprises a peristaltic pump, a fluid insulation tank, an impact nozzle, a feed hopper, an adjustable discharge port and a valve. The apparatus of the invention enables rotary friction in multiple contact manners to better observe grinding marks, can simulate corrosive wear behaviors of material under fluid impact and enables the addition of solid particles in a fluid when necessary; the influence of external disturbances upon testing results can be reduced, and signal stability in electrochemical testing can be guaranteed.

The invention discloses a method for measuring discharged quantities of greenhouse gases of a flowing water body. The method comprises the following steps of: (1) making a plurality of floating sampling boxes; (2) connecting the floating sampling boxes two by two through fixed ropes, placing the connected floating sampling boxes on a water surface, and sealing ventilating holes by using soft plugs; (3) extracting gases from the floating sampling boxes by using a needle cylinder, placing the extracted gases into a vacuum bottle as background samples, and recording a sampling time of each box body; (4) dragging the box bodies and drifting the box bodies along water, pulling the floating sampling boxes back to the shoreside, extracting contrast samples from the floating sampling boxes again by using the needle cylinder, and recording the sampling time of each floating sampling box; (5) taking the background sample and the contrast sample of each floating sampling box back to a laboratory, and measuring concentrations of CO2, CH4 and N2O of the samples; and (6) calculating a discharge rate of each greenhouse gas of the water body. By the method for long-time systematic measurement, estimation for nitrogen income and outgoing, estimation for a discharged flux of each greenhouse gas of the water body and evaluation for emission reduction measures can be realized according to a result. The method adapts for characteristics of the flowing water body; and the greenhouse gases on the water surface can be acquired conveniently, quickly and accurately.

The invention relates to a synthesizing method of a functionalized AuNc (gold nanocluster) based on BSA (bovine serum albumin) and application. The synthesizing method is characterized in that HAuCl4 is used as a precursor of Au (copper) atom, the BSA is used as a reductant and a protectant, and BSA-AuNCs is synthesized by a one-pot synthesis method. The synthesizing method has the beneficial effects that the synthesizing method is simple, and the reaction conditions are wild; the synthesized fluorescent AuNc has the advantages of good biocompatibility and photostability, good fluorescent characteristics, high yield of quantum, good water solubility, non toxicity, little inference by outside and the like; the synthesized BSA-AuNCs has higher selectivity on Cu<2+>, and can be applied to the quantitative detection and analysis of Cu<2+>; the detection method is simple and quick, the sensitivity is high, the toxicity is avoided, and the real-time qualitative and quantative detection of Cu<2+> is realized.

The invention discloses a method for growing large-area graphene on an insulating substrate. According to the method, a growing substrate is taken as an insulating material, a copper foil is taken as a catalyst and a carbon source, nitrogen and protective gas are taken as source gases, and the large-area graphene is grown on the insulating substrate by adopting a two-step (low-pressure growth and high-pressure growth) chemical vapor deposition method and using the short-range catalytic effect of the copper coil through face-to-face contact of the insulating substrate and the copper foil. The method disclosed by the invention is simple in operation of the whole process and low in cost; and the sample preparation is very high in repeatability and is less interfered by external world. The prepared single-layer graphene can be made into a large-area circuit device by using an exposure method without needing a complex transfer technology.

The invention relates to the technical field of bone conduction earphones and touch force feedback, in particular to a multifunctional piezoelectric bone conduction earphone and touch force feedback system integrated with glasses. The system comprises a glasses frame base body, an integrated piezoelectric driving and force feedback signal processing circuit board, a power supply module, a piezoelectric material, an upper electrode layer, a lower electrode layer and a flexible circuit, wherein the integrated piezoelectric driving and force feedback signal processing circuit board and the power supply module are arranged at the roots of glasses legs, the piezoelectric material is fixed in a groove of one glasses leg, the upper electrode layer and the lower electrode layer are coated on the surface of the piezoelectric material, and the flexible circuit is connected with the electrode layers and the circuit board. The circuit board receives audio signals and applies voltage signals to the electrode layers of the piezoelectric material. By the aid of inverse piezoelectric effect, the piezoelectric material generates vibration identical to sound electric signals in frequency so as to drive the glasses legs to vibrate together, vibration of the glasses legs is transmitted into a human body face contacting with the glasses legs, sound is sensed by auditory nerves of a human body through bone conduction, and accordingly sense of hearing is generated. When the piezoelectric material is subjected to external force, corresponding induction electrical signals are generated and are processed by the circuit board to corresponding feedback touch signals which are used for achieving control functions of function selection, switching and the like.

The invention relates to a water quality in-situ pre-treatment method in a water source region. According to the method provided by the invention, a water channel is arranged according to a terrain of the water source region by taking a water fetching opening of a water supply plant as an end point, a photocatalytic purification region, a combined ecological floating bed purification region and an aquatic plant purification region are separately arranged along the water channel, and in-situ pretreatment is carried out on an inflow of the water supply plant in the water channel. The water channel is enclosed by isolating barriers, and a block for intercepting garbage and floating plants is arranged at the water inlet end of the water channel. The three purification regions can be combined in adaptation to local conditions. Compared to the prior art, the method provided by the invention effectively couples four in-situ water quality purification technologies: photocatalysis, ecological floating bed, ecological contact oxidation filler and plant repair. The method is simple in structural design, low in material cost, small in interference by construction and operation on the outside world, simple to maintain and manage, free of additional added chemical agents and safe and free of secondary pollution and can be used for effectively improving the inflow water quality of the water supply plant, so that the main water quality indexes are enhanced by at least one grade.

The present invention also provides a signal acquisition device for collecting physiological parameters at the finger of the human body, which is characterized in that it includes: a collection clip for holding the finger of the human body; a sensor circuit unit arranged inside the collection clip and having an infrared light emitting module As well as the blood oxygen concentration detection module, human body thermal infrared radiation detection module, ambient temperature detection module, human body surface temperature detection module and heart rate detection module, the near-infrared light emitted by the infrared light emitting module passes through the human finger and is received by the corresponding module Afterwards, the blood oxygen concentration value, the human body thermal infrared radiation value, the ambient temperature value, the human body surface temperature value and the heart rate value are detected respectively; Analog values ​​are converted into digital quantities. Correspondingly, a method for obtaining the blood glucose concentration value by using the parameter signal detected by the device is also provided.

The invention relates to the technical field of glass production lines, in particular to a method of a manipulator stacking system for glass. A vision detecting system 1 is arranged on a support at the tail end of a conveying belt, acquires information such as the size, the position, the speed, the grade and the like of glass, and transmits the information to a management system 9 in real time; the management system 9 which is communicated with one-machine electric control systems 8 acquires working states and waiting states of the one-machine electric control systems, then distributed tasks according to states of various manipulators 2, and transmits glass distribution information to the one-machine electric control system 8 which receives the tasks; the one-machine electric control system 8 receiving the tasks controls a rib mechanism 6 thereof to ascend by the aid of the acquired information when the glass is conveyed to a grabbing area of the one-machine electric control system 8, an edge measuring device 5 operates to acquire a Y-direction coordinate value of glass after the glass is positioned, an X coordinate of the glass is acquired and the rib mechanism completes operation, and at the moment, position information of the glass is acquired completely. The manipulator stacking system can be used for grabbing a plurality of pieces of glass in various specifications.

The invention discloses a transformer diagnosis system which comprises a transformer, a sensor, an analog filter module, a power supply module, an RS232 transceiving module, a PC upper computer, a sampling control module, a battery and a DC-DC circuit. According to the invention, acoustic features generated during transformer failure detection in a frequency range of 20Hz-10kHz are compared to diagnose the operation state of a transformer; and the magnetically mounted vibration or acoustic sensor clings to the surface of the transformer to perform signal monitoring, is high in signal to noise ratio and convenient to mount, is less influenced by external interference, does not influence normal operation of the transformer and does not cause damage to the transformer structure. The invention also discloses a transformer diagnosis method using the transformer diagnosis system.

The invention provides a micro optical DC / AC electric-field sensor for eliminating the drift error of electric charges, capable of being used for measuring the voltage of a high-voltage DC transmission line by an optical method. Two transparent electrodes formed on an electro-optical crystal light-pass end surface used in an optical sensing module are electrically and compactly connected with two output terminals of an optical relay respectively. A secondary light source transmits the light beam that is open and is cut off periodically to a light beam collecting window of an the relay by auxiliary optical fiber under the coordinated control of a signal processing and control module, and the light beam that is open and is cut off periodically is used for controlling the breakover and the break of a circuit at the output end of the optical relay; the modulation to the DC electric field to be tested which is externally added on an electro-optical crystal can be realized, so that the DC electric field to be tested is periodically applied and eliminated on the electro-optical crystal. The error caused by space charge drift in the electro-optical crystal used when the DC electric field is measured can be controlled within bounds by the micro optical DC / AC electric-field sensor, thus realizing the long-term, stable, reliable and precise measurement on the DC electric field with the optical method.

The invention discloses an infrared touch screen for changing infrared light transmission paths and a touch point recognizing method for the infrared touch screen. In the touch screen, infrared light emitted by an infrared emission unit positioned on a non-touch face of the touch screen is changed in ray transmission direction by an emitting light guide unit prior to being transmitted to a touch face to form an infrared ray optical network, and then is changed in ray transmission direction by a receiving light guide unit prior to being transmitted to an infrared receiving unit of a non-touch face of the touch screen. By the aid of the infrared touch screen and the method, touch suspension height of the infrared touch screen is decreased, light interference resistance of the infrared touch screen is enhanced, and the protruded height and width of the edge of the touch face of the infrared touch screen are decreased.

The invention relates to a semiconductor pumped full-cavity microchip laser device with stable output wavelength, which is characterized by comprising a laser device, a temperature sensor, a temperature drive unit, a temperature control device and a refrigerating element, wherein the laser device comprises a semiconductor pumping source, a Nd:YAG crystal and a closed thermal insulation space arranged for the Nd:YAG crystal; a thermoprobe of the temperature sensor contacts with a surface of the Nd:YAG crystal; the temperature drive unit comprises an error amplifier and an H bridge; the temperature control device comprises a data acquisition card and a computer which is connected with the data acquisition card in two directions; a control and display module and a PID digital compensating network are arranged in the computer; the error amplifier and the temperature sensor are electrically connected with each other; the data acquisition card is electrically connected with the error amplifier; the control and display module compares the existing temperature digital signal with the preset standard temperature value to obtain a temperature difference value; and the PID digital compensating network carries out PID digital compensation according to the temperature difference value, and transmits the obtained feedback conditioning signal to the H bridge for power amplification, thereby driving temperature of the refrigerating element. The invention can be widely used in the fields of laser precision measurement and laser technology.

The invention discloses a back scattering smoke dust analyzer which continuously monitors the concentration of particulate matters in smoke emitted by a stationary pollution source and is mainly applied to the continuous real-time monitoring of the concentration of smoke dust in the smoke emitted by the stationary pollution source. The invention irradiates the smoke dust particles by using laser to produce scattering rays, detects the smoke dust concentration through obtaining back scattering light quantity, can furthest lower external disturbance, provides accurate measurement with wider range and obtain real concentration data through three-order polynomial fitting calculation at highest to primary acquisition signals. In addition, the invention can visually display human-computer interactive operation through an embedded low power consumption control system and the liquid crystal display of a big screen, and is greatly convenient for a user.

The invention provides a linear motor driver which comprises a current feedback loop module, a power module, a detecting module, and a state analysis and control module. The motor driver is characterized in that the current feedback loop module comprises a preposing input stage module, an adder module, a low pass filter module, a power amplification feedback module, a loading module, a current sampling amplification module and a gain adjustment module which are connected in sequence; and the output signal of the gain adjustment module is connected on the input end of the adder module finally, thus forming a loop. The linear motor driver has the characteristics of high linearity, wide bandwidth, good stability, small interference to outside, and strong capacity of resisting disturbance, and is small in volume and low in cost. As the temperature coefficient of the drain-source resistance of the power amplifier is positive, when the temperature of the power amplifier rises, the current is limited, therefore, no thermal breakdown occurs, and consequently, no secondary breakdown occurs.

The invention discloses a method for monitoring the clamping and the joint of drilling rods of a drilling machine. The drilling machine comprises a plurality of sections of drilling rods, a power head (2) and a pressurizing device (1); the power head (2) is used for pressurizing the drilling rods; the pressurizing device (1) is used for pressurizing the power head (2); and the drilling rods comprises the drilling rods from the 1st section to the Nth section from outside to inside, wherein i can be 2, 3, ... and N. The method comprises the following step: detecting to confirm whether the lifted drilling rod is the i-section drilling rod or not, and detecting to find whether the actual tension of the pressurizing device (1) at the moment is fi or not; comparing the actual tension fi with the preset rated tension Fi of the i-section drilling rod; and confirming that the i-section drilling rod is blocked and jointed when the actual tension fi is less than the rated tension Fi. In addition, the invention further discloses a monitoring controller and a monitoring system for implementing the method and the drilling machine with the monitoring system. Due to the adoption of the technical scheme of the invention, the external interference to the monitoring of the actual tension of the pressurizing device is less, and the measuring result is more accurate.

The invention discloses an ablation catheter which comprises a catheter main body and a catheter far end. The catheter far end is provided with an ablation electrode and further provided with a pressure sensor, and the pressure sensor is connected with the ablation electrode and formed by circumferentially distributing multiple strain gauges on an annular elastomer. According to the ablation catheter, due to the fact that the pressure sensor is arranged at the catheter far end and formed by circumferentially distributing the strain gauges on the annular elastomer, the contact force of the catheter far end can be acquired; the pressure sensor adopts the strain gauge principle and is simple in manufacturing technology, little in interference from the outside and suitable for mass production.

The invention is applicable to the field of information transmission control, and provides a mobile terminal and a method and a device for information transmission of the mobile terminal. The method includes: coding text messages to generate coded information; and loading the coded information to a luminous element of the mobile terminal and sending out the same. If the coded information contained in light needs to be analyzed, the method further includes the steps: receiving the light and taking out the coded information contained in light by a light sensing element; and decoding the coded information into the text messages. The text messages are converted into the coded information according to a preset scheme, then the coded information is loaded onto the light for transmission, and since light is long in transmission distance and less susceptible to external interference and light transmission has directivity, the information can be only transmitted to a designated target receiver, and safety is high.

The invention provides a method for controlling maximum power tracing based on wind power generation. The method comprises the step of setting original values of parameters such as the step length, the adjusting frequency and the stopping power tracing threshold, the step of sampling a voltage, a current and a frequency and the step of judging and adjusting the frequency. The whole operating process is precise and simple, easy to implement and high in practicability. Multi-dimensional control is carried out by changing the step length, the tracing frequency and the stopping power tracing threshold, the dynamic performance of tracing is improved, and the accuracy of tracing is increased. The strategy of absorbing power dynamically at intervals is adopted, when the wind speed is low and the revolving speed of a draught fan is low, the problems of stalling operation and rotation stopping of the draught fan are solved, and practicability is high. When it is judged that the revolving speed of the draught fan is not changed consecutive several times, continuous tracing after adjustment is carried out on the step length, the tracing frequency and the stopping tracing power threshold, a forced restarting and tracing mechanism is adopted, the problem of invalid tracing caused by non-changing of the measured revolving speed for a long time is solved, the situation that the wind speed fluctuates along with the wind speed is adapted, and the tracing accuracy is improved.

The present invention relates to an excitation method and device of a vibrating wire instrument. The method generates a SPWM wave, and then filters the generated SPWM wave through a filter circuit to obtain a sinusoidal waveform signal, and then applies the sinusoidal waveform signal to the vibrating wire instrument. The two ends of the frequency measuring coil in the instrument generate alternating electromagnetic force under the action of the permanent magnet, which drives the steel string to generate resonance. The SPWM waveform excitation signal whose pulse width changes according to the sinusoidal waveform rule generated by the method improves the precise control ability of the excitation signal and solves various limitations caused by the traditional excitation method using a pulse square wave.

The invention relates to a mandibular three-dimensional movement path tracking device used for a virtual articulator. The mandibular three-dimensional movement path tracking device comprises a maxillary retention clamp plate, a first connecting rod, a first shooting target connecting rod, a first shooting target, a mandibular retention clamp plate, a second connecting rod, a second shooting target connecting rod, a second shooting target, a left camera, a right camera and a fixing plate; the maxillary retention clamp plate is connected with the first connecting rod, and the first shooting target connecting rod is connected with the first connecting rod and the first shooting target; the mandibular retetion clamp plate is connected with the second connecting rod, and the second shooting target connecting rod is connected with the second connecting rod and the second shooting target; the left camera and the right camera are installed on the fixing plate, and the fixing plate is erected right ahead of the first shooting target and the second shooting target. The tracking device can fast obtain the mandibular three-dimensional movement path of an individual, output path data can be directly input into open type oral cavity restoration CAD software, and therefore the design and manufacturing quality and clinic adaptability of the crown and bridge occlusal surface are improved.

The invention provides an ultra-long distance distributed optical sensing device based on two-way optical amplification. The device comprises a controlling and processing device, a broadband laser device (1) and a first optical fiber coupler (2), parallel first optical fiber arm (3) and second optical fiber arm (4), a second optical fiber coupler (6), a sensing link (7) and a faraday rotation mirror (8), all of which are orderly connected together; a photoelectric detector (20) is further connected between the controlling and processing device and the first optical fiber coupler (2). The ultra-long distance distributed optical sensing device is long in sensing distance, relatively high in accuracy and good in positioning effect.

The invention relates to wavelength measurement techniques, in particular to a precision laser wavelength measurement device and a precision laser wavelength measurement method. The precision laser wavelength measurement device comprises a femtosecond pulse laser, a PPLN (periodically poled lithium niobate) crystal, photonic crystal fibers, a first convex lens, a first attenuator, a first half-wave plate, a diaphragm, a second attenuator, a second half-wave plate, a first polarization beam splitter, a third half-wave plate and a second polarization beam splitter. The PPLN crystal, the photonic crystal fibers, the first convex lens, the first attenuator and the first half-wave plate are sequentially positioned on an emergent light path of the femtosecond pulse laser; the diaphragm, the second attenuator, the second half-wave plate, the first polarization beam splitter, the third half-wave plate and the second polarization beam splitter are sequentially positioned on a to-be-measured laser path. An emergent light path of the second polarization beam splitter is provided with a reflection grating, and a second convex lens, an optical filter, a third convex lens, a third attenuator and an avalanche diode detector are sequentially arranged on a reflection light path of the reflection grating; a spectrometer is connected to a signal output end of the avalanche diode detector. The precision laser wavelength measurement device and the precision laser wavelength measurement method have the advantages of simple structure, simplicity and convenience in operation, easiness in adjustment, low external disturbance, high stability and extremely high precision.

The invention relates to a test apparatus and test method of the stiffness of a glass fiber mat and cloth. The test apparatus comprises a pedestal, a support, an up-and-down movement platform, a sample stage and a slide rail. The test method comprises the following steps: 1, cutting the glass fiber mat and cloth to be tested according to a prescribed dimension to form a sample to be tested, and carrying out standardized pretreatment on the sample to be tested; 2, tiling the pretreated sample to be tested on the sample stage, pushing the sample to be tested to forward move for a certain distance, and upward moving the up-and-down movement platform to make the upper surface of a horizontal scale just touch the falling edge of the sample to be tested; and 3, measuring the horizontal distance of the sample to be tested through the horizontal scale, measuring the falling distance of the sample to be tested through a height scale, and calculating the stiffness coefficient of the glass fiber mat and cloth sample to be tested, which is a ratio of the horizontal distance of the sample to be tested to the falling distance of the sample to be tested. The test method has the advantages of simple and effective process, scientific test principle and high test precision, and the test apparatus has the advantages of simplicity, durability, accurate test effect, convenience, and high practicality.

Using electronic scale instead of former transition table in the invention carries out multiple steps accumulated measuring for dynamic volume. Advantages of the invention are: no special calibrating requirement for flux, high accuracy in measurement, small interference from outside, good stability and repeatability, realizable automatic controlling and tasting by proper software so as to raise efficiency and reduce human incurring error.

The invention provides a human-simulated intelligent control method for autonomous region keeping of a water-jet propulsion unmanned ship, which is characterized in that analysis and calculation for a key parameter are performed on parameters measured by a position and attitude sensor used for controlling the boundary, a region keeping judgment system judges whether region keeping is required to be performed or not according to a calculated value and an actual value of the key parameter, a deviation equation of an under-actuated water-jet propulsion unmanned ship motion equation and a region keeping stop position trajectory equation is solved if region keeping is required to be performed, data information is transferred to a human-simulated intelligent controller, and the human-simulated intelligent controller determines a region keeping control strategy according to a regulated variable, the deviation and the variation trend of the deviation and implementing the region keeping control strategy through an execution mechanism. The human-simulated intelligent control method is applicable to the fields of region marine search and rescue and exploitation technologies and the like, and can ensure the unmanned ship not to be away from the specified region no matter how the unmanned ship moves.

The invention discloses a disturbance rejection control design method for constructing a hyperchaotic system and a hyperchaotic circuit. The hyperchaotic circuit comprises four channel circuits. The output signal x of the first channel circuit is used as an input signal of the second, third and fourth channel circuits, and is simultaneously used as an input signal of the first channel circuit and the second channel circuit after being inverted by an inverter. The output signal y of the second channel circuit is used as an input signal of the first, third and fourth channel circuits. The output z of the third channel circuit is used as an input signal of the second channel circuit and the fourth channel circuit. The output u of the fourth channel circuit is used as an input of the first channel circuit. The hyperchaotic circuit can obtain hyperchaotic dynamic characteristics within a large parameter range.

The invention discloses a device for detecting hydrophobicity of a composite insulator of a power transmission line and a control method for the device. By measuring characteristic parameters, including discharge amplitudes, discharge times and time intervals between each two adjacent discharge amplitudes and between adjacent discharge time, of surface discharge of the composite insulator at different aging time and by analyzing the characteristic parameters, three spectrograms corresponding to surface discharge characteristics of the composite insulator at different aging time are obtained. Fractal dimension and similarity corresponding to the three spectrograms are obtained by analyzing the three spectrograms, the hydrophobicity of the composite insulator is detected in real time, the aged power transmission line is timely replaced according to aging degree, the stability of the power transmission line is improved, and the failure rate of the power transmission line is reduced. Moreover, as surface discharge current parameters are directly obtained, the device is less subjected to external interference and quite high in accuracy, and meets the requirements of practical application.

The invention provides a single-phase ground fault line selection method, which comprises the following steps: separately acquiring transient zero-sequence currents of a half cycle after M lines is changed suddenly; acquiring a magnitude cross-correlation coefficient matrix G by a dynamic time bending distance algorithm; adopting plus or minus 1 to characterize the positive and negative polarity of the transient zero-sequence current, generating the transient zero-sequence current polarity coefficient matrix C of each line, and obtaining the polarity cross-correlation matrix H according to thepolarity coefficient matrix C of each line; combining the magnitude cross-correlation matrix G and the polarity cross-correlation matrix H to obtain a comprehensive cross-correlation matrix Q; usingthe comprehensive cross-correlation matrix Q as an input of a fuzzy C-means clustering, dividing the zero sequence current into two categories by the fuzzy C-means clustering, and selecting the faultline according to the category of each line. The invention also provides a single phase ground fault line selection device. The method and the device disclosed by the invention have less operation time, high accuracy and strong versatility.