22 results about "Arc duration" patented technology

The invention discloses a contact ablation assessment method and system in an SF6 circuit breaker breaking test, and relates to the field of contact ablation assessment, and the method comprises the steps: connecting an arc voltage divider in parallel at two ends of an SF6 circuit breaker, deploying a displacement sensor, and starting a main contact and arc contact breaking test; in the test process, arc voltage, current magnitude, contact displacement and voltage waveform data are acquired in real time through a high-frequency data acquisition system, denoising processing is performed on the voltage waveform data, and starting time, duration time and peak voltage of the arc are extracted; establishing a regression relation model between the arc duration time and the current magnitude according to the arc duration time and the current magnitude; and evaluating the ablation degree of the main contact through the regression relation model between the arc duration and the current magnitude, evaluating the ablation degree of the arc contact through the contact displacement, and generating a real-time contact health evaluation report according to the ablation evaluation result. And the evaluation efficiency is effectively improved.

The invention relates to the technical field of electronic device state evaluation, in particular to a service life judgment method and system for a high-voltage direct-current contactor. The method comprises the following steps: in each on-off action process of the direct current contactor, synchronously acquiring arc duration, peak current, contact temperature rise and pull-in delay time to form a physical quantity data set of single operation; calculating a thermal damage component according to the contact temperature rise and the arc duration, multiplying the peak current square by the contact resistance obtained by real-time measurement to obtain an electrical damage component, and determining a mechanical damage component based on the pull-in delay time; and calculating the weighted sum of the thermal damage component, the electrical damage component and the mechanical damage component, and recording the weighted sum as a basic damage value. Calculation is carried out based on field real-time data, the actual degradation process under different operation currents, operation frequencies and temperature rise conditions is accurately reflected, and the authenticity of life prediction is improved.

The invention relates to the technical field of circuit breakers, and discloses a high-low voltage circuit breaker propelling mechanism which comprises a switching-off mechanism, a frame assembly is fixedly installed on the inner wall of the switching-off mechanism, a communication assembly is installed on the inner wall of the switching-off mechanism, and an operator pulls a spring reset rod to drive a radian stop block to move. Then a connecting rod is pushed to ascend to drive a balancing weight, a sliding rod, a spring ring and a connecting block to synchronously ascend, the connecting block ascends to push a moving contact on a moving contact supporting piece to be in contact with a static contact to enable current to be connected, when the current is large, a spring ejector rod downwards pushes an L-shaped plate to descend to enable a radian stop block to be separated from a fixing ring again, and at the moment, the connecting rod is pushed to ascend to drive the balancing weight, the sliding rod, the spring ring and the connecting block to synchronously ascend. The spring ring and the balancing weight return, and a larger initial driving force is provided by utilizing the elastic potential energy of the spring of the spring ring and the gravitational acceleration of the balancing weight, so that the moving contact supporting piece and the static contact can be quickly separated for a larger distance, the duration time of an electric arc is shortened, and the continuous combustion of the electric arc is effectively prevented.

The invention provides a circuit breaker and an uninterruptible power supply. The circuit breaker comprises a first busbar, a second busbar, a main contact and a plurality of arc contacts, the arc contact comprises an arc moving contact and an arc static contact. When the arc moving contact is in contact with the arc static contact, the plurality of arc contacts are connected in series through the conductive piece, the arc contact located at the head end of the plurality of arc contacts connected in series is connected with the first busbar, and the arc contact located at the tail end of the plurality of arc contacts connected in series is connected with the second busbar. When the arc moving contact is in contact with the arc static contact, the multiple arc contacts are connected in series through the conductive pieces, so that the arc contacts can generate multiple sections of series-connected arcs at the breaking moment, the sum of the voltages of the multiple sections of arcs is far higher than the system power supply voltage after the voltages of the multiple sections of arcs are superposed, the arcing duration can be shortened through the high voltage difference, and the fault can be rapidly cut off. Meanwhile, arc energy is dispersed to a plurality of fractures, heat concentration is avoided, and permanent damage to the arc contact and the internal structure of the circuit breaker caused by high-temperature arc ablation can be prevented.

The invention relates to the technical field of power battery testing, in particular to a power battery internal multi-scene coupling arc discharge testing system and a testing method thereof. The method comprises the following steps: setting a test environment; setting an electrode distance, adjusting the distance between the adjustable electrode plate and the fixed electrode plate to a preset value through a driving motor, and locking the adjustable electrode plate and the fixed electrode plate; a liquid cooling circulation subsystem is started, and a refrigerator reduces the surface temperature of a liquid cooling plate under the control of a temperature controller until a condensation sensor judges that a condensation steady state is formed; applying high voltage and inducing an electric arc, and recording an arc discharge event; and data are analyzed, the high-speed data acquisition device synchronously acquires voltage and current transient signals and condensation judgment signals, and the upper computer extracts critical trigger voltage, arc duration and discharge frequency and establishes a coupling relationship between a condensation state and an arc behavior. According to the technical scheme, the arc characteristics of the electrode gap can be simulated and tested under various environmental conditions.

The application discloses a multi-electrode continuous discharge spark discharge generating device, and relates to the field of aero-engine ignition. The spark discharge generating device comprises an ignition circuit and a multi-electrode spark plug. The multi-electrode spark plug comprises a metal shell and a plurality of central high-voltage electrodes arranged in the metal shell. The application matches the design parameters of the multi-electrode spark plug with the non-uniformity coefficient of the electric field in the ignition end face, and designs the ignition circuit, so that the maximum value of the delay difference between the breakdown time of two adjacent discharges is less than the arc duration time, the continuous discharge of the multiple electrodes is realized, the arc flame energy is higher, the contact area of the ignition arc and the mixed fuel is larger, the combustion in the combustion chamber is more uniform, the misfire rate of the spark plug is effectively reduced, and the operation reliability of the engine is improved.

The application relates to a cable trench single-phase grounding arc ignition time simulation calculation method and system, wherein the method comprises the following steps: constructing a cable single-phase grounding fault arc simulation model; the cable single-phase grounding fault arc simulation model comprises a cable two-dimensional geometric model, material physical property parameter and physical field coupling boundary condition; extracting an arc current and voltage waveform in a half cycle under different working conditions, calculating the arc average energy in the half cycle and the average power in the arc duration through numerical integration; constructing a cable tunnel model and configuring material parameters of the cable and the optical cable, and arranging monitoring equipment; taking the average power in the arc duration under different working conditions as a fire source heat release rate to input the cable tunnel model for simulation, and recording monitoring data of the monitoring equipment. Through the technical scheme, precise simulation calculation of cable trench single-phase grounding arc ignition time and fire can be realized.

The invention discloses an arc extending device and method for a vacuum circuit breaker synthesis test and a test system, the arc extending device comprises N arc extending circuits and a controller, and N is an integer greater than or equal to 2; each arc extending circuit comprises a switch, an ignition sphere gap, a capacitor and a resistor which are sequentially connected in series, and the N arc extending circuits are connected to the two ends of the tested circuit breaker in parallel; the controller controls the switches of the N arc-extending circuits to be switched on and off, monitors the current flowing through the tested circuit breaker, triggers the ignition sphere gap of the first arc-extending circuit when the change rate of the current is smaller than or equal to a threshold value, triggers the ignition sphere gap of the second arc-extending circuit after the ignition sphere gap of the first arc-extending circuit is triggered for a first time period, and then triggers the ignition sphere gap of the second arc-extending circuit after the ignition sphere gap of the second arc-extending circuit is triggered for a second time period. And the ignition sphere gap of the Nth arc extending circuit is triggered until the (N-1) th time period of triggering the ignition sphere gap of the first arc extending circuit, and the first time period to the (N-1) th time period are sequentially increased. The arc delay device can prolong the arc duration time and improve the success rate of the vacuum circuit breaker synthesis test.

The invention discloses a method for detecting the cooling performance of gas to an axial arc and a related device, and relates to the technical field of electrics. Under the action of each to-be-detected gas medium, the circuit breakers with the same operation parameters are controlled to be switched on and off in the preset arcing interval corresponding to the to-be-detected gas medium, and arcing information corresponding to switching on and switching off is obtained; taking an intersection of the actual arcing durations corresponding to all the gas media to be detected as a common arcing interval; determining a characteristic time constant corresponding to each to-be-detected gas medium according to arc resistance characteristics reflected by the voltage signal and the current signal between the fractures of the circuit breaker in the common arcing interval corresponding to each to-be-detected gas medium; and comparing the characteristic time constants corresponding to the to-be-tested gas media to determine the cooling performance difference of the axial arc between the to-be-tested gas media, thereby providing a reference basis for circuit breaker design and gas type selection.

The invention provides an exception handling method and system based on the current collection state of a vehicle pantograph and a train, and can be applied to the technical field of vehicle detection. The method comprises the following steps: detecting the current collection state of a pantograph of a vehicle according to a working video and an ultraviolet band signal acquired by the pantograph of the vehicle in a working state to obtain a detection result; under the condition that the detection result represents that abnormal arcing exists during current collection of the pantograph, abnormal arcing continuous information of the vehicle and abnormal arcing generation information of the position interval are determined on the basis of historical detection results matched with the vehicle identifier of the vehicle and the position interval where the vehicle is located; and determining a preset processing strategy for processing the exception type under the condition of determining that the exception type matched with the exception arcing continuous information or the exception arcing occurrence information exists.

The invention discloses an electromagnetic control switch on-off direct-current high-voltage large-current circuit, which belongs to the field of electromagnetic switches and comprises an electromagnetic control switch K1 and an electromagnetic control switch K2. One end of a wiring coil of the electromagnetic control switch K2 is connected with a control signal, and the other end of the wiring coil of the electromagnetic control switch K2 is connected with a power supply VCC; the other end of the wiring contact of the electromagnetic control switch K2 is connected with one end of the wiring contact of the electromagnetic control switch K1. The two ends of the wiring contact of the electromagnetic control switch K2 and the two ends of the resistor R1 are arranged in parallel. Two ends of the resistor R1 and two ends of the capacitor C2 are arranged in parallel; and one end of a wiring coil of the electromagnetic control switch K1 is connected with the anode of the diode D2. The arc energy is effectively reduced, the duration of the arc is inhibited, and the service life of the contact is prolonged; the risk of simultaneous arc discharge is reduced; and the potential safety hazards of long arc duration and serious contact ablation when the electromagnetic control switch cuts off direct current are avoided.

An example method of estimating an arc duration in a circuit breaker includes receiving a first measurement corresponding to a low-frequency electric field emitted from a vacuum circuit breaker during an interruption or circuit break operation and a second measurement corresponding to a low-frequency magnetic field, vibration, or acoustic emitted by the vacuum circuit breaker during operation, aligning the first measurement and the second measurement in time, wherein the first measurement is calibrated according to a first physical constant and wherein the second measurement is calibrated according to a second physical constant; and determining, by a sensor-fusion algorithm or a trained AI model, an estimated duration value of an arc duration using the time-aligned first measurement and second measurement, wherein the arc duration corresponds to a first time corresponding to a separation of contacts of the vacuum circuit breaker and a second time corresponding to arc extinction.

This application provides a method for collaborative analysis of the status of a pole-mounted circuit breaker with primary and secondary fusion, comprising: identifying the symmetry type of the arc-extinguishing current waveform by analyzing the arc duration and pulse direction information data in the initial acquisition dataset, wherein the symmetry type of the arc-extinguishing current waveform includes an asymmetry type; if the arc-extinguishing current waveform is of an asymmetry type, then analyzing the alternation law of positive and negative transient electromagnetic pulses through pulse direction information data to evaluate the polarity neutralization state of the residual charge; by fusing the polarity neutralization state of the residual charge with the cumulative wear depth of the contacts, using a random forest algorithm to predict whether there is abnormal drift of the zero position of the integral baseline, obtaining the prediction result of abnormal drift of the zero position of the integral baseline; if the adjusted discrimination threshold exceeds the preset allowable range, then jointly analyzing the cumulative wear depth and the arc duration of the circuit breaker to identify the actual wear pattern of the contacts.

The present application relates to the technical field of locomotive roof monitoring, and particularly relates to a kind of locomotive roof all-around intelligent monitoring device, including roof high-voltage porcelain bottle monitoring module, pantograph monitoring module, display module, data analysis module.The state of high-voltage porcelain bottle on roof is monitored in real time, so that the broken high-voltage porcelain bottle during locomotive driving cannot satisfy the blocking current, and the occurrence of accidents is avoided.The high-definition monitoring camera and infrared monitoring camera are used to collect view and thermal image respectively, so that the determination result is more accurate.The detection result is determined by data analysis, the determination of the broken state of the porcelain bottle by the roof high-voltage porcelain bottle monitoring unit ensures the safety of locomotive driving and the efficiency of transportation, the pantograph monitoring unit is verified twice by layering and focusing, which ensures the accuracy of the detection result, and the arc monitoring unit determines the arc duration and arc frequency to further ensure the safety and service life of the line.

The invention provides a high-voltage system of a motor train unit and a control method, and relates to the field of high-voltage systems. The pantograph is used for obtaining electric energy from a contact network, the insulator is directly connected with the pantograph, and the network side lightning arrester is connected to one side of the pantograph in parallel and used for reducing internal overvoltage of a power unit vehicle. An input port of the integrated high-voltage electrical box is connected with a pantograph through a high-voltage cable and a first out-box pluggable connector, a first output port of the integrated high-voltage electrical box is used for being connected with a transformer, and a second output port of the integrated high-voltage electrical box is used for being connected with an integrated high-voltage electrical box of an adjacent compartment. In the pantograph, the arcing sensor detects the actual arcing data of the carbon slide plate, the arcing controller adjusts the pantograph rising pressure of the pantograph according to the actual arcing data under the condition that the arcing duration time is longer than the preset duration time, the arcing duration time is shortened in a plateau scene, the abrasion of the carbon slide plate is reduced, and the service life of the carbon slide plate is prolonged.

The invention discloses a method and a device for fault diagnosis and residual life calculation of a pantograph of a railway vehicle. The method includes: setting a state value for pantograph diagnosis; constructing a database of indexes for pantograph diagnosis; comparing the detected indicator with a reference indicator; and when the detected index is greater than the reference index in the database, storing the fault code of the pantograph. The state value can be the pressure of the actuator in a pantograph rising state before the railway vehicle runs, the pressure of the actuator in the running process of the railway vehicle, the arc generation frequency or arc duration in the running process of the railway vehicle, the insulation resistance in the running process of the railway vehicle or the abrasion loss of a main sliding plate. An apparatus for performing the method is also disclosed.

The invention provides an electrical equipment safety monitoring method and system, and belongs to the technical field of equipment safety monitoring, and the method comprises the steps: obtaining a target current value of electrical equipment, and obtaining the target current data of the electrical equipment in a target time period based on a first current collection frequency if the target current value is smaller than a first current threshold value; if the target current value is greater than or equal to the first current threshold value, acquiring target current data of the electrical equipment in a target time period based on a second current acquisition frequency; obtaining an arc high-frequency current component based on the target current data, and calculating arc duration, arc energy and a high-frequency component ratio of the arc high-frequency current component; determining an arc type based on the arc duration, the arc energy and the high-frequency component ratio; and if the electric arc type is a dangerous electric arc, generating safety alarm information. The reliability of safety monitoring of the electrical equipment can be improved.

The invention discloses a method, a system, a medium and equipment for calculating an energy dynamic distribution proportion of arc discharge in transformer oil, and the method comprises the steps: carrying out an arc discharge experiment in a closed oil tank of a transformer, and collecting voltage, current, pressure waveform and gas component data in an arc discharge process; the gas temperature Tend at the arcing ending moment is calculated; gas temperature data under different arcing times are obtained by changing the arcing duration, and a gas temperature time-varying curve T (t) is obtained through fitting; a time-varying relational expression of the gas production mole number n (t) is obtained through experimental fitting, and a function relation between the gas molar weight and arc energy input Earc (t) is established; based on the gas temperature time-varying curve T (t) and the gas production mole number n (t), time-varying curves of six sub-items of gas internal energy, oil vaporization energy, oil decomposition energy, gas expansion work, electrode contact loss energy and arc optical radiation energy are calculated, and the energy distribution proportion of each sub-item energy at each moment t is calculated.

A vacuum arc extinguish chamber comprises a shell, a movable conducting rod, a lower main contact, a lower arc contact, a static conducting rod, an upper arc contact, an upper main contact and a corrugated pipe. One end of the shell is provided with a guide cap for providing guidance when the movable conducting rod moves, when the upper arc contact and the lower arc contact are disconnected, the movable conducting rod can rotate in the moving process through a guide path provided by the guide cap, and when the upper arc contact and the lower arc contact are disconnected, the upper arc contact and the lower arc contact are cut in and disconnected in the tangential direction through rotation; the connecting mechanism is arranged on the movable conducting rod and can rotate, the connecting mechanism is used for being connected with the operating mechanism, and when the operating mechanism drives the movable conducting rod to move downwards, rotation of the movable conducting rod in the moving process is not interfered through the connecting mechanism. The beneficial effects of the invention lie in that the lower arc contact and the upper arc contact are enabled to act rapidly when being disconnected in a rotary power-off mode, the duration of the arc can be effectively shortened, the breaking capacity can be improved, and the damage of the arc to the lower arc contact and the upper arc contact can also be significantly reduced.

The utility model provides an arc extinguishing assembly and a contact system, and relates to the technical field of electrical equipment. The arc extinguishing assembly comprises a permanent magnet and a mounting shell. The installation shell is provided with a first installation cavity and two second installation cavities, the permanent magnet is arranged in the first installation cavity, the two second installation cavities are arranged on the top side and the bottom side of the installation shell, each second installation cavity comprises an inlet, an arc extinguishing channel and an outlet which are sequentially communicated, the two inlets in the upper end and the lower end are oppositely arranged, and the two outlets in the upper end and the lower end are oppositely arranged. The arc extinguishing channel extends along the end part of the mounting shell, and the two outlets are respectively arranged at the top and the bottom of the mounting shell, so that the arc can enter the arc extinguishing channel along the upper opening and the lower opening, and the arc extinguishing effect is effectively improved; the magnetic field generated by the permanent magnet can effectively guide the electric arc to move to the inlet of the second mounting cavity, so that the electric arc can be extinguished more quickly, the duration of the electric arc is shortened, and the extinguishing process of the electric arc is further accelerated. Therefore, the arc extinguishing assembly is simple in structure, small in occupied space and good in arc extinguishing effect.

The application provides a pole-mounted circuit breaker state early warning method, device, equipment and storage medium, the method comprises the steps of: obtaining current data, vibration data and switch operation data of the pole-mounted circuit breaker; correcting the state early warning model according to the switch operation data; inputting the current data into the preset current repair model to obtain current standard data, and determining the current disconnection time according to the current data; determining the arc duration and arc disturbance data of the pole-mounted circuit breaker according to the current disconnection time, the current data and the current standard data; determining the arc characteristic data according to the arc duration and the arc disturbance data, and obtaining the arc characteristic vector after vector processing; vectorizing the vibration data to obtain a vibration feature vector; inputting the arc characteristic vector and the vibration feature vector into the corrected state early warning model for fusion analysis to obtain the aging evaluation value of the pole-mounted circuit breaker, and outputting a state early warning prompt according to the aging evaluation value.