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396results about How to "Safety protection" patented technology

Pilot protection method for direct current line current abrupt change of multi-terminal direct current transmission system

The invention provides a pilot protection method for the direct current line current abrupt change of a multi-terminal direct current transmission system. The method comprises the following steps of: 1, acquiring fault transient state current amperage; 2, calculating the current abrupt change in one period of time by using the acquired fault transient state current amperage, comparing the current abrupt change with a setting value according to the value of the current abrupt change and judging the direction of faults; and 3, distinguishing inside-area and outside-area faults by the cooperation of the current abrupt change directional elements at the terminals of a line; and if the directional element at each terminal is judged to have a forward directional fault, the fault is judged as the inside-area fault, and if at least one directional element is judged to have a reverse directional fault, the fault is judged as the outside-area fault. The method has the advantages that only current data is used, the required sampling rate is low, the current abrupt change is easy to calculate, the communication amount is small, and line faults can be rapidly detected; all energy information but a high frequency signal in a fault transient state is used, the signal energy is strong, and the protection is safety and reliable; and the method is applied to a parallel, a serial and a hybrid multi-terminal direct current system.
Owner:XI AN JIAOTONG UNIV

High-efficiency intelligent high-side electronic load switch with wide voltage adaptability

A high-efficiency intelligent high-side electronic load switch with wide voltage adaptability comprises a power supply module, a core control module, a self-boosting module, a voltage detection module, a current detection module and a switching module. The core control module is used for signal acquisition, information processing and storage and logic control; firstly, the core control module receives an external switch control input signal and detection signals output by the current detection module and the voltage detection module and processes and analyzes monitoring data according to an internally stored program to control the switching module to complete corresponding actions; secondly, the core control module provides a PWM control signal for the self-boosting module. The voltage detection module and the current detection module are used for detecting the real-time operating voltage and current of the switching module and transmitting data to the core control module for processing and analysis. The self-boosting module is used for providing a driving voltage for a switching tube in the switching module. The switching module is used for executing the on-off actions of a load. The high-efficiency intelligent high-side electronic load switch is wide in operating voltage range, high in operating frequency, high in efficiency, low in loss, safe, reliable and programmable.
Owner:LIUZHOU CHANGHONG MACHINE MFG

Encryption and decryption method, and PLC system using the same

The invention relates to the field of industrial computer software safety, in particular to a method for encrypting and decrypting information in a memorizer and a PLC system for applying the method. The encrypting method of the invention comprises the following steps of storing an algorithm F()in the system; mapping the unique identifier of the memorizer into a cipher key K; encrypting the information stored in the memorizer by utilizing the cipher key K based on a symmetric encryption algorithm; and predefining the access strategy based on the user identity in order to control the user's access to the information stored in the memorizer; and storing the access strategy in the memorizer by utilizing the cipher key K based on the symmetric encryption algorithm. During the decryption process, decrypting, information stored in the memorizer is decrypted by utilizing the cipher key K based on the symmetric encryption algorithm, and the access strategy is decrypted by utilizing the cipher key K based on the symmetric encryption algorithm. Then the user's access to the information stored in the memorizer is controlled based on the user identity. The method and the system of the invention have the advantage of being capable of enhancing the safety of software codes.
Owner:SIEMENS CHINA

A double wheel arm locking type inspection robot mechanism

The invention relates to an inspection robot and in particular relates to a double-wheel-arm locking type inspection robot mechanism which is capable of walking in a high pressure / ultrahigh pressure transmission line and is used for automatically inspecting and detecting transmission line facilities. The double-wheel-arm locking type inspection robot mechanism comprises front and back wheel arms which are mounted on a guide rail base and are of a same structure, wherein each wheel arm is composed of a walking obstacle-detouring mechanism, a lifting mechanism and a rotating mechanism; the walking obstacle-detouring mechanisms are located at the tops of the lifting mechanisms; the top ends of the rotating mechanisms are connected to the lower ends of the lifting mechanisms; the lower ends of the rotating mechanisms are fixedly connected to the guide rail base; a mass center adjusting mechanism is mounted on the guide rail base; a space, which is enclosed by the walking obstacle-detouring mechanisms, is used for enclosing a lead, thereby achieving a safe protective function; and at the obstacle-detouring moment, the walking obstacle-detouring mechanisms are lifted by the lifting mechanisms, the connecting rods of the walking obstacle-detouring mechanism rotate respectively under the action of an opening and closing motor, and the connecting rods are opened left and right so as toavoid an obstacle and pass by the side face of the obstacle, thereby realizing obstacle detouring. The double wheel arm locking type inspection robot mechanism is suitable for obstacles in different sizes and has the advantages of strong obstacle-detouring capacity, high safety, and the like.
Owner:SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI

Electronic equipment, and identification system and decryption method thereof

The invention discloses an identification system, which is used for being matched with a central processing unit of electronic equipment, so that three-dimensional modelling of a human face is realized. The identification system comprises multiple face shooting modules, an infrared light emitting device and an eye shooting module; the multiple face shooting modules are in signal connection with the central processing unit, and used for respectively shooting different parts of the human face, so that different facial information is obtained; the infrared light emitting device can emit infrared ray; and the eye shooting module is matched with the infrared light emitting device, and used for shooting eyes of a human, so that iris information is obtained. By means of the identification system provided by the invention, acquisition of three-dimensional information of a face can be realized through the multiple face shooting modules 1; furthermore, an iris identification manner is combined; compared with the manner of only acquiring two-dimensional information of the face by using a single camera, the security reliability and the robustness of the electronic equipment are relatively high; and the privacy of users can be protected more safely. The invention further relates to the electronic equipment having the identification system, and a decryption method for decrypting the electronic equipment.
Owner:TRULY OPTO ELECTRONICS
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