33results about How to "Avoid failure effects" patented technology

The invention discloses a section power supply and status measurement and control method of parallel-connected traction networks at the tail end of a double track railway. By taking the section (10km) of the railway as a unit, a contact line sectioning and a sub-section post are additionally arranged at a section boundary. The sub-section post comprises a circuit breaker, a current transformer, a voltage transformer and a measurement and control unit. The circuit breaker and the current transformer connected with the circuit breaker in series are in bridge connection with the two ends of the contact line sectioning, and the sectioning is series-connected in the contact line. Through the arrangement of the sectioning and the sub-section post and the introduction of running status criterion, the running situation of charging trains on the traction networks can be timely and accurately mastered by operators on duty in a traction substation or dispatching room; by using the fault criterion, various faults can be timely and accurately found, distinguished and isolated, the continuous power supply and running of fault-free sections are ensured, the power outage scope is reduced to the maximum extent, and further the reliability of power supply of the traction networks is improved. The device has less investment and is easy to implement, not only is conveniently used by a new line, but also facilitates the transformation of an existing line.

The invention discloses a segmented power supply distributed protection system for electrified railway traction network, which corresponds to the section of the railway, divides the catenary in the electrified railway traction network into several segments, and adds a segmenter and a switch at the segment. Closing station; switching station includes circuit breaker, current transformer, voltage transformer and measurement and control unit; the circuit breaker is usually in the closed state; the secondary side of the voltage transformer, the secondary side of the current transformer, and the left adjacent switching station of the switching station The secondary side of the current transformer and the secondary side of the current transformer of the right adjacent switching station are connected to the input terminal of the measurement and control unit, and the output terminal of the measurement and control unit is connected to the circuit breaker control terminal of the switching station; each measurement and control unit communicates with the traction substation through the transmission network Or dispatching room connected. The invention constitutes a segmented distributed protection method of the traction network. Compared with the centralized protection method, its real-time performance is not affected by the number of segments of the traction network. The related devices involved in the invention have less investment and are easy to implement, which is convenient for the adoption of new lines and the transformation of old lines.

The invention discloses a profiling variable sprayer based on plant canopy phenotype and an adaptive control method. The profiling variable sprayer includes a profiling mechanism module A, a profiling mechanism module B, a lifting and sliding module, a profiling bracket module, Liquid supply system, electrical box and detection module; on the basis of dividing the function and mechanism of the profiling sprayer, it adopts a modular and lightweight design. The whole machine has the characteristics of compact structure, lightness and flexibility, easy manufacture and easy maintenance. . The adaptive control method of the profiling variable sprayer automatically collects the ultrasonic echo signal and processes it to obtain the characteristic information of the tree canopy, and then calculates the air volume according to the canopy volume and canopy density phenotype characteristic parameters, The spray volume is calculated by the leaf area density phenotypic characteristic parameters; the profiling control amount calculated by the ultrasonic distance measurement information drives the profiling mechanism to profil, and realizes the automatic profiling of the crown contour, with high profiling accuracy, accurate and efficient spraying, Save medicine and environmental protection, easy to operate.

Provided is a fault identification and protection method of an electrified railway AT traction network. When network voltage is lower than a specified value, labeling no-load trend symbol values of the near ends and the far ends of a touch net T and a negative feeder F in each self-coupling segment with 0, labeling influent trend symbol values with 1, labeling effluent trend symbol values with -1, if an absolute value of a sum of the trend symbol values of two ends of the touch net T in each self-coupling segment is larger than or equal to 1, or a failure absolute value of a sum of the trend symbol values of two ends of the negative feeder F is larger than or equal to 1, or a failure absolute value of a sum of the trend symbol values of two ends of a touch net T branch and a negative feeder F branch is larger than or equal to 1, respectively judging the touch net T to be in short circuit failure to the ground, or the negative feeder F to be in short circuit failure to the ground, or the touch net T to be in short circuit failure to the negative feeder F, and breaking off all breakers at two ends of each self-coupling segment. Short-circuit reactance calculated according to corresponding voltage and short-circuit current at two ends of each self-coupling segment and the corresponding length of the self-coupling segment determine failure positions.

The invention discloses a method and device for detecting abnormal operation of an asynchronous motor. The method includes: obtaining the stator current and voltage of the motor; obtaining the output torque of a reference motor according to the stator current and voltage; obtaining the output torque of the detected motor; calculating The difference between the output torque of the reference motor and the output torque of the detected motor is obtained to obtain a deviation value of the output torque of the motor; it is judged whether the deviation value of the output torque of the motor is greater than a preset threshold; when the deviation of the output torque of the motor When the value is greater than or equal to the preset threshold, a motor failure signal is output. Through this method, it is detected in time that the motor is running at a low speed frequency. At this time, the positive direction of the encoder defines the rotation direction and the positive direction of the asynchronous motor. Protective measures to prevent the motor speed out of control from further expanding the impact of the fault.

The invention discloses a profiling variable sprayer and a profiling control method based on tree crown phenotype characteristics. The profiling variable sprayer includes a profiling mechanism module A, a profiling mechanism module B, a lifting and sliding module, a profiling bracket module, a The hydraulic system, electrical box and detection module; on the basis of the function and mechanism division of the profiling variable sprayer, the modular and lightweight design is adopted. The whole machine has the characteristics of compact structure, lightness and flexibility, easy manufacture and easy maintenance. . The adaptive profiling control method of the profiling variable sprayer automatically collects the ultrasonic echo signal and processes it to obtain the phenotype characteristic information of the tree canopy, and then calculates the spray volume according to the phenotype characteristic parameters of the canopy volume and canopy leaf area density; through The profiling control amount calculated by the ultrasonic ranging information drives the profiling mechanism to profil the canopy contour automatically, with high profiling accuracy, precise and efficient spraying, less medicine and environmental protection, and easy operation.

The present invention relates to a code drum water-level meter, and is characterized by that its metrical digital code adopts code drum as carrier, said code drum adoptis spiral carry mode, and comprises three kinds of structure: total information bit structure, synchronous segmented bit structure and variable-speed segmented bit structure. Said invention is reliable in operation, large in range ability, high in accuracy and has several applications.