6 results about "Insulator flashover" patented technology

The invention discloses an epoxy CCTO gradient coating method for improving the flashover characteristic of an alternating current insulator and a prepared epoxy CCTO gradient non-uniform modified insulator, and belongs to the technical field of high-voltage insulating materials. The method comprises the following steps: stirring epoxy resin, calcium copper titanate, a dispersing agent and a catalyst, adding a curing agent, and performing secondary stirring to prepare slurry; the insulator is non-uniformly divided into four layers in the axial direction, the slurry is sequentially sprayed to the first layer area to the fourth layer area of the insulator, and the insulator is solidified; 5 points are randomly selected for each layer by using a hardness tester, the surface hardness of the coating is measured, the next step is carried out when the hardness value reaches the target hardness, and secondary curing is carried out when the hardness value does not reach the standard; and the epoxy CCTO gradient non-uniform modified insulator is obtained. According to the epoxy CCTO gradient coating method for improving the flashover characteristic of the alternating current insulator, an efficient solution is provided for surface electric field optimization and flashover performance improvement of high-voltage insulation equipment.

The application relates to the technical field of lightning protection, and discloses an ultra-ultra-high-voltage transmission line non-conduction corona plasma lightning protection and monitoring device, which comprises a tower pole main body, the top end of the tower pole main body is fixedly connected with a mounting base, the upper surface of the mounting base is fixedly connected with a support, the upper surface of the support is fixedly connected with an amplifier, the upper surface of the amplifier is fixedly connected with an S-pole lower plate, the outer wall of the S-pole lower plate is boltedly connected with an insulating isolation support mechanism, the insulating isolation support mechanism is connected with a multi-tip metal needle pole mechanism, and the multi-tip metal needle pole mechanism is connected with an N-pole upper plate mechanism. The coupling energy of the lightning cloud self electrostatic field and the line power frequency electric field is used as the only excitation source, so that the pulse corona discharge can be triggered without external power supply, a high-density plasma shielding layer is generated to neutralize the lightning cloud charge, the lightning leader formation and the lightning channel are blocked from the source, and the vicious faults such as the ground potential counterattack, the insulator flashover and the equipment damage are avoided.

The invention discloses a power transmission line lightning stroke performance evaluation method, system and device based on a Monte Carlo method and a storage medium, and relates to the technical field of power transmission line lightning protection and Monte Carlo simulation optimization. A Monte Carlo random sampling program is configured in numerical software according to lightning current statistical distribution, lightning current peak values are extracted by using the program to drive simulation, an insulator flashover result of each simulation is judged by applying a damage effect criterion, calculation results are accumulated in real time, counterattack performance parameters and statistical monitoring parameters are synchronously calculated, and the lightning current statistical distribution is calculated. When the monitoring parameters simultaneously meet a preset convergence threshold value, simulation is automatically stopped, and a final evaluation result is output; the lightning counterattack simulation calculation amount is reduced, the lightning protection design efficiency of the middle-high voltage power transmission line is remarkably improved on the premise that the precision is guaranteed, and safe and economical operation of a power grid is facilitated.

The invention discloses a power transmission overhead line insulator defect detection device and method, and belongs to the technical field of insulator detection. The device comprises a sensor module, a signal conditioning module, a data acquisition and analysis module and a positioning module, wherein the sensor modules are deployed at two ends of a power transmission overhead line and are used for receiving fault magnetic field signals generated by insulator flashover in a non-contact manner and converting the fault magnetic field signals into initial electric signals; the signal conditioning module filters and amplifies the initial electric signal; the data acquisition and analysis module acquires the processed fault electric signal, and calculates the fault position through a time difference method based on the time difference of the signal reaching the sensors at the two ends; and the positioning module completes fault positioning. The fault magnetic field signal generated by insulator flashover is received in a non-contact manner, so that non-contact online monitoring is realized, weak fault signal detection sensitivity and defect positioning precision are improved, and early warning and accurate positioning of insulator flashover faults can be effectively realized.

The invention relates to the technical field of insulation monitoring, in particular to an icing insulator arc discharge identification and flashover early warning method, system and device and a storage medium. Obtaining an iced insulator image, constructing an arc monitoring model, obtaining an arc dangerous area through high-frame-rate image acquisition, and determining an arc morphological characteristic relation; the image data is subjected to arc area automatic segmentation, arc pixel area extraction and geometric feature calculation, and based on an intermittent arc matrix, when the arc length ratio reaches a preset threshold value or it is detected that an intermittent arc quenching reignition phenomenon disappears, flashover early warning is judged; and based on the intermittent arc matrix, an insulator flashover model is obtained in combination with coupling characteristics of arc length and brightness, and insulator flashover is predicted. The problems that a traditional icing insulator flashover early warning method is poor in real-time performance, low in accuracy and weak in environmental adaptability are solved, millisecond-level rapid early warning is achieved, and reliable guarantee is provided for safe operation of an electric power system.

This application relates to the field of transmission line insulator fault detection technology, specifically to a method, system, and device for monitoring insulator flashover faults. The method includes: acquiring leakage current data of the transmission line; analyzing the amplitude variation of the leakage current at different frequencies in the frequency domain, and then combining this with the amplitude distribution characteristics of harmonics in the frequency domain to obtain the high-frequency harmonic hazard level at each acquisition time; analyzing the leakage current pulse characteristics at each acquisition time based on the peak value variation and peak frequency in the leakage current data to obtain flashover fault characteristic values ​​at each acquisition time; and monitoring flashover faults in the transmission line insulators based on the flashover fault characteristic values. This application can improve the accuracy of detecting flashover faults in transmission line insulators.