49results about How to "Avoid loss of life and property" patented technology

The invention discloses a photovoltaic system fault arc detection method combining multiple detection signals. The method comprises the following steps: carrying out an equal time interval analysis of the multiple detection signals when the signal statuses are not changed; acquiring multiple characteristic values of a current time period based on a characteristic quantity obtained through the photovoltaic system fault arc detection method and the input multiple analysis time period detection signals; acquiring a typical value based on the selected detection signals; constructing correction factors for characteristic values of the next time period based on the typical values and the characteristic values of the detection signals for the current time period and the next time period; and carrying out linear weighting of each constructed correction factor and the corresponding characteristic value of the next time period to obtain a combined characteristic quantity, so as to complete the combined detection of photovoltaic system fault arcs. The method provided by the invention has the advantages that the photovoltaic system fault arc detection working conditions are expanded, the resistance of the photovoltaic system fault arc detection characteristic quantity against external interference is improved, the judgment of the combined characteristic quantity on the time of fault occurrence is more accurate, and a photovoltaic system can run more stably and safely.

The invention discloses a method and a system for preventing collision of a robot based on a current method. The method comprises the following steps: acquiring the working current value of a drivingmotor, and comparing the working current value with a corresponding standard current value-position curve, thus obtaining a comparison result of each current; judging whether each part of the robot isin collision or not according to the comparison result of each current. The system comprises a current module, a comparison module and a judgment module, wherein the current module is used for acquiring the working current value of the driving motor; the comparison module is used for comparing the working current value with the standard current value; the judgment module is used for judging whether the robot is in fault or not. According to the method and the system, disclosed by the invention, whether corresponding parts of the robot are in collision or not can be quickly judged through acquiring the working current value of the driving motor, and measures can be taken in time once the robot is in collision, so that automatic monitoring on the robot can be realized, and the safety of life and property can be ensured; the method and the system can be widely applied to the technical field of robots.

The invention relates to a braking device of a tramcar, in particular to a centrifugal-type safety braking device of an active track-locking tramcar. The invention solves the problems that the existing passive anti-skid device is prone to insensitive response and long braking response time, the maintenance thereof is easily ignored, and the reliability thereof is low. In the invention, two groups of centrifugal speed sensors are arranged on two tramcar wheel bodies; the two ends of a rotary connecting rod are fixedly connected with two gears on the outer side of the tramcar frame by passing through the tramcar frame; two racks are mounted on the tramcar frame and engaged with the gears; one end of each rack, which is hook-shaped, is matched with the other end of a telescopic rod; two frameworks are arranged below the rotary connecting rod and connected with the tramcar frame via a suspender switch; two locking dogs are rotatablely mounted at the ends of the two frameworks, which are connected via a fixed connecting rod. The invention has the advantages of sensitive response, short braking response time, convenient maintenance and high reliability.

The invention provides a wading traffic guidance system and a wading traffic guidance method. The system comprises a plurality of water gauges, a plurality of video monitoring front ends, a background server, a plurality of closed road permit controllers and a plurality of wading traffic guidance devices, wherein the plurality of video monitoring front ends are used for monitoring road conditions, particularly conditions in water gauge areas, in real time, and transmitting a video image to the background server in a wireless mode; the background server is used for recognizing the received video image, acquiring the water level data, transmitting control instructions to the closed road permit controllers and transmitting traffic guidance information to the wading traffic guidance devices in a wireless mode; the plurality of closed road permit controllers are used for closing or permitting the road; the plurality of wading traffic guidance devices are used for displaying the traffic guidance information to vehicles and passerby; and the traffic guidance information comprises road closure / permit time, wading permit risk and warning water level information. The system has the advantages of intelligence, stability and reliability.

The invention discloses an alarming method, device and system for abnormal conditions occurring after vehicle locking. The method comprises the steps that a controller of a current vehicle acquires in-vehicle state information of the current vehicle in a vehicle locking state; the controller judges whether there are forgotten persons or animals in the current vehicle or not; if yes, the controller controls an alarm of the current vehicle to give an alarm. According to the alarming method, device and system, whether there are persons or animals in the vehicle or not is judged by acquiring the in-vehicle state information after vehicle locking, therefore, alarming can be conducted in time when some persons or animals are left in the vehicle, and the condition that danger occurs when the persons or animals are left in the vehicle is avoided.

The invention discloses a multi-disaster monitoring, early warning and emergency command system, and the system comprises a monitoring system which is used for monitoring and collecting the data of each monitoring point; a transmission system used for transmitting data of each monitoring point; a disaster analysis system used for carrying out analysis operation on the received data according to adisaster model to generate disaster early warning information; a refined meteorological analysis system used for analyzing meteorological historical data and meteorological forecast data of monitoringpoints, lines and planes; a civil air defense patrol reporting system used for sending disaster information; a early warning system used for issuing disaster early warning information in a preset early warning mode according to the disaster early warning information; and an emergency command system used for performing real-time command according to the disaster early warning information. According to the invention, meteorological and geological disasters, river water conservancy, urban traffic, fire protection, mine enterprise safety supervision, hazardous chemical enterprise safety supervision and other information are communicated, one-stop management is realized, and the early warning efficiency is improved; and life and property losses caused by disasters are effectively reduced and avoided.

The invention provides a bridge scouring pit detection device. The bridge scouring pit detection device mainly comprises an underwater measuring device, an ultrasonic transmitting receiver, a controlprocessing system, a positioning transmission system and a power supply device, wherein the underwater measuring device is fixed on an underwater bridge; the ultrasonic transmitting receiver is fixedon the underwater measuring device; and the control processing system is used for controlling the ultrasonic transmitting receiver to measure the distance between the transmitting end of the ultrasonic transmitting receiver and the surface of a measured riverbed. Measured data are collected and transmitted to the bridge monitoring system of a bridge monitoring department through the positioning transmission system. The device can completely take the place of existing manpower ship measurement, solar energy is utilized for independent power supply, the transmission data can be measured in realtime, data simulation is carried out on the depths and distribution range of scouring pits, the purpose that the depths of the bridge scouring pits and the distribution status of the scouring pits aremonitored uninterruptedly in 24 hours is reached, the bridge monitoring department is helped to give out an early warning in flood seasons, and unnecessary loss of life and property is avoided.

The invention discloses a single-door and single-family house capable of floating automatically in a flood, and belongs to the field of architecture engineering. The single-door and single-family house comprises a floor plate (4), a house body (1) is arranged on the floor plate (4), circumferential courtyard wall plates (3) are arranged around the floor plate (4), a basement (2) is arranged below the floor plate (4), and the floor plate (4), the circumferential courtyard wall plates (3) and the basement (2) are of an integral structure. A plurality of lifting guide columns (8) and guide sleeves (10) matched with the lifting guide columns (8) are arranged below the floor plate (4). A plurality of floating drums (9) are arranged on the lower bottom face of the floor plate (4). A house landing foundation (15) is arranged below the basement (2). A plurality of water inlets (14) are arranged between the bottom face of the basement (2) and the house landing foundation (15). The single-door and single-family house can rapidly and automatically float without too large resistance when a flood comes, and can return to an original position accurately along with water falling when the flood subsides.

The invention relates to a region monitoring method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring scanning information output by scanning amonitored region by a millimeter-wave radar; determining gait characteristics of an intruding object in the monitored region based on the scanning information; determining whether the intruding object is an object forbidden to enter the monitored region or not according to the gait characteristics; and if the intruding object is an object forbidden to enter, giving an alarm. According to the embodiment of the invention, whether the intruding object is the entry forbidding object or not can be determined according to the gait characteristics of the intruding object, and when the intruding object is the entry forbidding object, an alarm can be given out, so that responsible personnel in the monitored area can arrive at the scene as soon as possible, and the safety of the specific monitoredarea is guaranteed.

The invention belongs to a recycling system for water resources of a metro station foundation pit closely adjacent to a high slope. The recycling system comprises a foundation pit water pumping and draining system, a sedimentation water collecting tank system, a high slope collection and storage system and a water resource utilization system. The water resource utilization system is used for introducing filtered water in a fire-fighting water pool to provide water resources for a concrete structure curing water-consuming system of a metro station, a construction site fire-fighting pipeline system, a field area road sprinkler system, a foundation pit anchor-plate retaining water-consuming system, a dust fog falling gunlock water-consuming system and a temporary living quarter water-consuming system. The water resources of the metro station foundation pit closely adjacent to the high slope are effectively recycled, and the recycling system has the advantages that the method is simple and practical, the water consumption quantity is decreased, the construction cost is reduced, the water drainage and filtration effects are good, the pollution control cost is low, sewage is recovered and recycled on the spot, and the energy-saving and environment-friendly effects are good.

The invention belongs to the field of basalt fiber composite materials, and relates to a preparation method of a basalt fiber composite material. The method comprises the following steps of: S1, dispersing multi-walled carbon nanotubes and graphene nanosheets in ultrapure water, and introducing ozone to oxidize the multi-walled carbon nanotubes and the graphene nanosheets to finally obtain a dispersion liquid; S2, adding glacial acetic acid into the dispersion liquid obtained in S1, and then adding cationic polyacrylamide; S3, cleaning the surfaces of basalt fibers for later use; S4, performing electrophoretic deposition on the positively charged multi-walled carbon nanotubes and graphene nanosheets treated by the cationic polyacrylamide in the step S2 on the basalt fibers in the step S3 to obtain pretreated basalt fibers; and S5, coating the pretreated basalt fibers obtained in the step S4 with a mixed solution of resin and a curing agent, and then carrying out mold pressing to obtain the basalt fiber composite material. The preparation method disclosed by the invention is simple and easy to implement; and the prepared basalt fiber composite material is convenient for damage monitoring, and defects caused to the material are effectively avoided.

The invention relates to an energy-saving and environment-friendly transformed heating system for safe non-pressure operation of boilers. The heating system comprises a plurality of the boilers, a water outlet of an internal recycle water supply pipe is connected with a water inlet of an internal recycle heat accumulation tank, the internal recycle heat accumulation tank is provided with a plurality of water outlets, each water outlet of the internal recycle heat accumulation tank is connected with a water inlet of an internal recycle water delivery pipeline through a pipeline which is connected with internal recycle water pumps in series respectively, a water outlet of internal recycle water delivery pipeline is connected with water inlets of heating loops of a plurality of double-pipe heat interchangers respectively, the water inlets of the heating loops of the double-pipe heat interchangers are connected with the water return opening of each boiler through an internal recycle water return pipe, water outlets of heated loops of the double-pipe heat interchangers are connected with a water inlet of a heating water outlet pipe respectively, and the water inlets of the heated loops of the double-pipe heat interchangers are connected with a water outlet of the heating water return pipe respectively. The aim is providing the energy-saving and environment-friendly transformed heating system for the safe non-pressure operation of the boilers, the heating system has the advantages of being very prominent in energy-saving effect, low in operating cost, safe and reliable, small in environment pollution, and better in heating effect.

The invention discloses a multifunctional wireless charging transmitting device and a charging mode control method. After a first signal sent by a wireless charging receiving device is received through a signal receiver, the wireless charging receiving device is determined to exist nearby; further, a charging parameter corresponding to the wireless charging receiving device can be analyzed and acquired from the first signal; and a corresponding power-on mode is determined through a processor based on the charging parameter, so as to allow a charging voltage or charging current generated on a corresponding wireless charging receiving coil to be matched with the charging parameter in a process of powering on the wireless charging transmitting device according to the power-on mode. Therefore,the wireless charging transmitting device disclosed by the embodiment of the invention can automatically switch corresponding charging modes according to different sets of charging equipment, so thattechnical effects of increasing the intelligence level and enlarging the application range of the wireless charging transmitting device are achieved.

The invention provides a similarity measurement-based fault monitoring method for a shared subspace multi-view electric smelting magnesium furnace. The method comprises the steps of collecting data and extracting features; constructing a coefficient matrix, and obtaining a neighborhood weight coefficient matrix; establishing an objective function; modifying the established objective function, andsolving to obtain a projection matrix; based on the projection matrix and the approximate expression X * of the plurality of visual angles, obtaining SPE and N2 values of the X *, and based on each visual angle, accumulating SPE1N; obtaining the control lines SPE99, N299 and SPE1N99; collecting a test video to obtain a test video common feature matrix; calculating SPEtest and N2test values of theXtest * and SPE1Ntest based on each view angle; if the value of the SPEtesti, the value of the N2testi and the value of the SPE1Ntesti are higher than a control line, judging that a fault occurs; according to the invention, the problem of multi-view video data joint modeling is mainly solved; the consistency and complementarity of the video data of the multiple visual angles are utilized, missingreport caused by the fact that abnormal working condition points are not captured at a single visual angle can be avoided, life and property loss caused by the fact that abnormal working conditions are not processed in time is avoided, and the fault monitoring efficiency and accuracy can be improved.

The invention relates to the technical field of pipeline dredging, in particular to a municipal pipeline dredging device convenient to store. The municipal pipeline dredging device comprises a machinebody, driving device and a silt removing device, wherein the machine body comprises a shell and a cover plate, the cover plate is movably connected to the top end of the shell, the driving device comprises a driving mechanism and traveling wheels, the silt removing device comprises a drill bit, a fixing disc, a coupling device, a gear motor and a silt collecting plate, the silt collecting plate is fixedly connected to the outer wall of the lower portion of the shell, the silt removing device is driven by the gear motor to drive the coupling device, the fixing disc and the drill bit to rotate,and the drill bit removes clogged objects and then collects the clogged objects through the silt collecting plate. According to the municipal pipeline dredging device, through cooperation of the driving device and the silt removing device, the condition that traditional dredging equipment needs manual operation is avoided, an operator does not need to enter a pipeline for operation, life and property losses are avoided, meanwhile, the municipal pipeline dredging device is simple, low in cost, easy to operate and convenient to store and carry, and the dredging efficiency is improved.

The invention discloses a civil air defense door based on a high barrier effect, and relates to the technical field of civil air defense doors. The civil air defense door comprises a door frame main body, the door frame main body is mainly composed of pre-buried layers, a lining frame and a sealing frame, wherein the lining frame is arranged on one side of the sealing frame and is integrally formed with the sealing frame, the pre-buried layers are arranged on the side surfaces of the lining frame, the pre-buried layers are connected with the installation position through concrete pouring, a filling sealing groove is formed in the middle position of the inner side of the sealing frame along the sealing frame, the edge position of the front side of the sealing frame protrudes forwards to form a sealing protrusion, sliding groove rods are arranged at the top and the bottom of one side of the sealing frame, and a sealing groove is formed in the edge of the outer side of the sealing protrusion. The impact force generated by explosion and damage of armor-piercing bullets can be effectively resisted, the sealing performance of the door body is higher, water seepage, toxic gas and toxic smoke flowing and the like can be effectively prevented, and the use convenience by people is greatly improved.

The invention provides an unmanned aerial vehicle remote danger avoiding method. The method comprises steps: the position information and the height information of the unmanned aerial vehicle are acquired; the position information and the height information are transmitted to the cloud platform side; and danger parameters fed back by the cloud platform are received, and based on a prompt from the danger parameters, danger avoiding processing is executed. The invention also provides another unmanned aerial vehicle remote danger avoiding method, two unmanned aerial vehicle remote danger avoiding devices and an unmanned aerial vehicle remote danger avoiding system.

The invention discloses an antiskid run-flat tire which comprises an outer tube, an inner tube and a hub. An external fixing steel ring and an internal fixing steel ring are arranged on the hub, the outer tube is clamped into the external fixing steel ring, the inner tube is clamped into the internal fixing steel ring, connecting tubes are arranged on one side of the inner tube and one side of a net-shaped steel wire framework, a three-way inflating nozzle is arranged on the hub, the three-way inflating nozzle is respectively communicated with an outer cavity and an inner cavity, a plurality of left herringbone deep grooves are evenly formed in the left side of the central line of the outer tube, a plurality of right herringbone deep grooves are evenly formed in the right side of the central line of the outer tube, a left antiskid figure is arranged between two left herringbone deep grooves on the left side of the central line of the outer tube, a right antiskid figure is arranged between two right herringbone deep grooves on the right side of the central line of the outer tube, the left antiskid figure is connected with the right antiskid figure through longitudinal connecting steps, and the longitudinal connecting steps are evenly distributed along the central line.

The invention discloses a kitchen safety control method based on Internet of Things. The method comprises the following steps: determining intelligent household devices in the kitchen; obtaining a concentration of lampblack and a concentration of combustible gas in the kitchen; and controlling the intelligent household devices in the kitchen to reduce the concentration of the lampblack and / or theconcentration of the combustible gas in the kitchen when the concentration of the lampblack in the kitchen reaches a preset lampblack concentration threshold value, and / or when the concentration of the combustible gas in the kitchen reaches a preset combustible gas concentration threshold value.

The invention discloses a vehicle load monitoring system and method and a vehicle, belongs to the technical field of automobiles, and can solve the problem that a driver cannot conveniently and timely know the conditions of vehicle overload or serious cargo loss and the like. The system comprises a load measuring module used for collecting current load information of a vehicle; a processing module which is used for comparing the current load information of the vehicle with the load specification information of the vehicle stored in the system or the weight information of the goods carried by the vehicle to obtain a comparison result; and an early warning module which is used for carrying out early warning on the vehicle according to the comparison result. The method is used for vehicle load monitoring.

A rapid fire extinguishing and cooling system for a battery pack comprises the battery pack, a temperature and smoke sensor, a fire extinguishing and cooling pump, a conveying pipeline, a cooling andfire extinguishing material box and a control device. The battery pack comprises a plurality of battery packs which are connected in series or in parallel, and a sealed shell coating the outer sides of the battery packs. The temperature and smoke sensor is arranged in the sealing shell and used for detecting the temperature value and the smoke concentration value in the sealing shell. One or moreof a cooling material and a fire extinguishing material are contained in the cooling and fire extinguishing material box. The control device starts the fire extinguishing and cooling pump according tothe temperature value output by the temperature and smoke sensor and the smoke concentration value, so that the fire extinguishing and cooling pump drives the fire extinguishing or cooling material to enter the sealed shell for fire extinguishing or cooling. The rapid fire extinguishing and cooling system for the battery pack can provide enough time for drivers and passengers to escape from the vehicle, so that life and property loss is avoided.

The invention discloses an anti-falling full framing structure and a construction method. The structure comprises a full framing body. A bottom support is arranged below the full framing body; a jacking is arranged above the full framing body; and a cast-in-place beam is arranged above the full framing body, a door opening is arranged in the full framing body, stand columns are arranged on the twosides of the door opening, a distribution beam is arranged above the door opening, bearing beams are arranged between the stand columns and the distribution beam, extending plates are arranged at thetwo ends of each bearing beam, and a strip-shaped bamboo plywood is arranged between the extending plates of every two adjacent bearing beams. Stress safety of the structure is guaranteed, and meanwhile the strip-shaped bamboo plywood arranged on a cross beam extension plate in a lap joint mode well prevents objects falling from the upper portion of the door opening from high altitudes. An effective driving width of a bracket passing door opening is increased, the structure and the method are suitable for erecting a large-span passing door opening, a stress system is good, and the construction safety can be ensured. Life and property losses caused by falling objects above the passing door opening can be effectively prevented.

The invention discloses a positioning service processing method, equipment, a device and a medium, and the method comprises the steps that: a positioning management entity transmits a QoS index requirement containing integrity to a terminal through a positioning protocol after receiving a positioning service request; and after executing an auxiliary measurement function and integrity auxiliary monitoring according to the index requirements, the terminal returns a measurement value to the positioning management entity, and the positioning management entity performs position estimation and integrity estimation according to the returned measurement value. By adopting the method and the device, the new air interface terminal can timely obtain the integrity requirement of the positioning service provided by the network side, and the terminal can feed back whether the integrity requirement is met or not to the network. After the integrity function is introduced, life and property loss caused by errors of a positioning system can be avoided, legal responsibility caused by position errors is avoided, and the safety of a user can be fully guaranteed.

The invention discloses an emergency broadcasting system and method for online customer service staff. The emergency broadcasting system comprises a customer service conversation maintenance module, abroadcasting message configuration module and a broadcasting message pushing module, wherein the customer service conversation maintenance module is used for acquiring the messages of customer service terminals in conversation; the broadcasting message configuration module is used for configuring emergency broadcasting messages; the emergency broadcasting message pushing module is used for pushing emergency broadcasting messages to the customer service terminals in conversation. The emergency broadcasting system has the advantages that an emergency broadcasting function is added to a currentonline customer service system, an administrator can timely edit an emergency broadcasting message of an emergency after the emergency occurs and timely notify the online customer service staff in conversation of the emergency broadcasting message, the online customer service staff can timely communicate with the customers about the emergency, possible loss of the customers can be avoided, secondary communication caused by the fact that the emergency is not notified timely, and the experience of the customers is improved.

The invention discloses a steam injection boiler fault alarm method, device and system. The method comprises the steps that pressure data of a steam injection boiler and a pressure threshold value corresponding to the pressure data are obtained, and if the pressure data surpass the corresponding threshold value, an alarm instruction is sent; and when a pressure threshold value modifying instruction is received, the pressure threshold value is modified according to the pressure threshold value modifying instruction, wherein the pressure threshold value modifying instruction comprises a pressurethreshold value storing address and a modification value. Working personnel can conveniently find out the fault condition of the steam injection boiler in time, the working efficiency is effectivelyimproved, and normal production of the steam injection boiler is guaranteed. Moreover, the working personnel can adjust the pressure threshold value in time according to needs, and therefore the working efficiency and the production efficiency of the steam injection boiler are effectively improved.

The invention discloses a fireproof intelligent lock supporting emergency escape, and relates to the technical field of intelligent locks. The fireproof intelligent lock comprises a lock body, an outer panel part and an inner panel part, wherein the lock body is assembled on the side surface of a door body; the outer panel part is assembled on the outdoor side of the door body; the inner panel part is assembled on the indoor side of the door body; the outer panel part and the inner panel part perform motion transmission through square steel and a transmission shaft; and a clutch module is arranged in the outer panel part, a temperature sensing mechanical part is arranged in the inner panel part, the two ends of the transmission shaft are connected with the clutch module and the temperature sensing mechanical part respectively, the transmission shaft is driven to rotate through the temperature sensing mechanical part, and then the clutch module is driven to achieve unlocking. The intelligent lock is novel in structure, and the personal and property loss caused by the fact that a door cannot be effectively and rapidly opened is fundamentally avoided when the intelligent lock is applied to emergency situations such as fire disasters or explosions.

The invention discloses a safety tire which is high in safety performance. The safety tire comprises an outer tube, an inner tube and a hub. An outer fixing steel ring and an inner fixing steel ring are arranged on the hub, and the outer tube is clamped in the outer fixing steel ring; the inner tube is clamped in the inner fixing steel ring, and an outer cavity is formed between the outer tube and the inner tube; an inner cavity is arranged in the inner tube, and a gel block is arranged between the inner side of the outer tube and the outer side of the inner tube; a plurality of small ventilation holes are formed in the gel block, and a net-shaped steel wire framework is embedded on the inner side of the inner tube body; a connecting pipe is arranged in the inner tube and one side of the net-shaped steel wire framework, and a check valve is arranged at the position, arranged on the connecting pipe, of the inner cavity; and a supporting ring is arranged at the position, arranged on the hub, of the inner cavity, and the supporting ring is connected with the net-shaped steel wire framework through a plurality of springs; a three-way inflation nozzle is arranged on the hub and is communicated with the outer cavity and the inner cavity.

The invention discloses a photovoltaic system fault arc detection method of mixing quadratic form time frequency distribution characteristics and self-adapting product function analysis. A local mean is used to decompose and analyze a current signal, and a first-order product function is selected to be used as a characteristic value. Quadratic form time frequency distribution is used to analyze the current signal, and a plurality of frequency components in a frequency range used for indicating generating of a fault arc effectively are selected to be used as another group of characteristic values. A real-time range method is used to process a plurality of groups of characteristic values to acquire a real-time range value, which is input in an extreme learning machine, and whether the fault arc exists is determined by the output value of the extreme learning machine, and finally, a cut-off signal is transmitted according to a set trigger standard. The selected characteristic values are used to discover the fault arc accurately, and essential differences before and after the occurrence of the fault arc are distinctly distinguished, and the extreme learning machine is used to determine the fault arc in various load working conditions quickly and accurately, and a fault arc branch is cut off. Compared with a conventional direct current fault arc detection technology, the photovoltaic system fault arc detection method has advantages of wide application range and strong expandability.

Disclosed are an alarm message sending method, a base station, and a storage medium. The method comprises: a base station issuing, after receiving an alarm message issued by a core network, the alarm message to a terminal; and in a message sending window where the alarm message is located, repeatedly sending the alarm message, wherein a time interval of the repeated sending is greater than a measurement time of a terminal measurement process.

The invention discloses an arc detection method for the fault of a photovoltaic system under an abnormal light condition. When an MPPT algorithm dynamic regulating system operating point is not caused by a fault arc accident, by allowing the fault arc characteristic quantity threshold value to tightly track the system operation point variation curve regulated by the MPPT algorithm, the circumstances that the fault arc detection electric quantity varies dynamically or lowers continuously caused by light change can be dealt, and the detection device can effectively detect fault arc in the photovoltaic system at any time can be ensured. According to the detection method, the fault arc detection precaution capacity of the photovoltaic system under abnormal light condition caused by changes of weather and environment is greatly improved, the misoperation problem caused by that the original set threshold value of the photovoltaic fault arc protection device is invalid is effectively solved, and the loophole that the traditional detection device is difficult to detect potential arc threats under the special situations is filled.