63 results about "Power systems protection" patented technology

The invention discloses an automatic cooling switch cabinet used for a fuse type isolation switch, belonging to the power system protection electric appliance technology field. The automatic cooling switch cabinet comprises a cabinet body, a fuse type isolation switch, a temperature-humidity detection unit, a control unit, an alarm unit and a fan. An air inlet and an air outlet are arranged on the cabinet; the fan is installed at the air inlet; the fuse type isolation switch is installed between the fan and the air inlet; the temperature-humidity detection unit is connected to the control unit for detecting temperature and humidity inside the cabinet body; and the output terminal of the control unit is connected to the alarm unit and the fan. With the air inlet and the air outlet being arranged on the switch cabinet, the automatic cooling switch cabinet performs real-time monitoring on the temperature inside the switch cabinet and starts up the fan to radiate heat when the temperature and the humidity are detected to be high, which solves the problem that the temperature inside the switch cabinet is too high, which affects the working of the fuse type isolation switch. Besides, the invention also has advantages of automatic heat radiation, autonomous detection, easy usage and low cost.

The invention relates to a dual-output optical current transformer and a signal processing method thereof. The optical current transformer is characterized by comprising an LED (Light-Emitting Diode)light source; an optical current sensor, a first photodetector, a second photodetector, an AD (Analog-to-Digital) collection preprocessing circuit and a digital signal processing circuit, wherein theoptical current sensor is used for sensing current information of a detected conductor according to light emitted by the light source to obtain a first optical signal and a second optical signal; thefirst photodetector is used for detecting the first optical signal to obtain a first output signal; the second photodetector is used for detecting the second optical signal to obtain a second output signal; the AD collection preprocessing circuit is used for obtaining a first direct current component and a second direct current component; and the digital signal processing unit is used for converting the first direct current component information and the second direct current component information into a first feedback control digital quantity and a second feedback control digital quantity andfeeding the first feedback control digital quantity and thesecond feedback control digital quantity to the AD collection pre-processing circuit; after the AD collection pre-processing circuit obtains the output value, the digital signal processing unit demodulates the output value to obtain a current flowing through the detected conductor. The dual-output optical current transformer and the signal processing method thereof provided by the invention can be widely applied to the field of power system protection.

The invention designs a water-cooled power monitoring device with a transient monitoring capability. A functional panel is used for controlling, displaying and alarming an electric power monitoring device, displaying the on-off state and alarm information of the electric power system protection switch sent by a programmable logic controller, and outputting the on-off control information of the electric power system protection switch to an input andoutput module; a sensor module is used for measuring operation parameters of the power system; the programmable logic controller completes acquisition of operation state information of the power system protection switch and linkage protection information processing of the protection switch through the input and output module, exchanges information with a computer, and outputs a power system network topology structure and alarm information to the function panel. The water-cooled power monitoring device integrates the functions of real-time information monitoring, power supply and distribution network control, fault diagnosis, alarm, noise reduction and the like, realizes centralized management of a power system, and ensures stable and reliable operation of the power system.

The invention discloses a hybrid-power stepless speed changing system, which comprises an output shaft, a motor power coupling mechanism, a stepless speed changing mechanism and an input shaft. The input shaft is connected with an engine and used for transmitting power to the stepless speed changing mechanism. The motor power coupling mechanism comprises a motor stator, a motor rotor and a motor supporting shaft connected with the motor rotor and further comprises a synchronizer used for realizing power transmission between the input shaft and a motor supporting shaft and/or power transmissionbetween the motor supporting shaft and the output shaft. The hybrid-power stepless speed changing system has advantages that by arrangement of the synchronizer, operation under a pure engine drive mode can still be realized when high-voltage electricity exhausting or high-voltage power system protection occurs, and accordingly an application range of the hybrid power technique is greatly expanded.

The invention provides a microgrid distributed system protection method and device and relates to the technical field of power system protection. The method is applied to any stage of protection unitexcept a bus protection unit in microgrid distributed system protection equipment, and the protection equipment comprises multiple stages of protection units which are arranged according to voltage grading of a microgrid distributed system; the method comprises the following steps: detecting fault information in the microgrid distributed system, the fault information comprising island sign information; sending the fault information to an upper-level protection unit to enable the upper-level protection unit to generate a protection instruction according to the fault information; and receiving aprotection instruction, and executing a protection action according to the protection instruction. According to the invention, the microgrid protection equipment is subdivided into different levels of protection units with independent relative functions, each level of protection unit has detection, protection and control functions, and because the protection units are more independent and flexible, the equipment does not have a protection dead zone, and the protection reliability is improved.

The invention relates to the technical field of power system protection, in particular to an arc extinguishing circuit breaking device. The device comprises an installation shell, a static contact, a moving contact and an insulation arc extinguishing piece. The installation shell is provided with a first containing cavity formed in the first direction and a second containing cavity formed in the second direction and communicated with the first containing cavity. The static contact is arranged in the first accommodating cavity; the moving contact is movably arranged in the first accommodating cavity along the extension direction of the first accommodating cavity, the moving contact can be connected to the static contact or separated from the static contact to connect or disconnect a circuit, and the joint of the moving contact and the static contact directly faces the second accommodating cavity; the insulating part is movably arranged in the second containing cavity in the extending direction of the second containing cavity, and when the moving contact is separated from the static contact, the insulating part can move to the position between the moving contact and the static contact to isolate arc discharge. The moving contact and the static contact are protected from being oxidized, and good conductive characteristics are kept.

The invention provides a relay protection action behavior intelligent evaluation method and system. The method comprises the steps of acquiring and preprocessing fault event information; analyzing the preprocessed information data, and generating a data chain table; calling data in the data chain table for calculation to obtain the characteristic quantity of each required parameter; according to the characteristic quantity, in combination with the relay protection action condition, calling a pre-constructed expert rule module to carry out identification and judgment; identifying and judging events, analyzing and evaluating action behaviors of relay protection in the events according to identification and judgment results, pushing the events which cannot be automatically identified and judged to manual auditing, and updating and perfecting a knowledge base in an expert rule module for the events. According to the method, full coverage of analysis and evaluation of the protection action behaviors of the power system is realized, the protection action events do not need to be graded according to the influence degree, the requirements on knowledge and experience of auditing personnel are effectively reduced, and the processing pertinence and efficiency of field defects are improved.

The invention relates to a power grid fault traveling wave fault location equation automatic construction method, and belongs to the technical field of power system protection. According to the invention, engineering processing is carried out on a grid method for power grid line fault wave process analysis; generating a total extension branch time record table and an extension branch record table based on a measuring point according to recursive data of a wave process grid method, and writing a wave propagation path equation in parallel; and on the basis of obtaining the traveling wave path equation expression, assigning unknown numbers and establishing an equation set in parallel, judging whether the linear equation set can be solved or not according to the relationship among the rank of the coefficient matrix, the number of equations and the number of the unknown numbers, if so, obtaining a corresponding distance measurement formula through symbolic operation, and if not, not forming the distance measurement formula.

The invention discloses a multi-CPU system communication data detection method and system. The method comprises the steps that a sending CPU is controlled to obtain communication data in a memory and modify the communication data; when the communication data is non-state quantity data, the communication data is sent to a receiving CPU according to a preset period, the total receiving number of the receiving CPU is accumulated, and a receiving CPU data table is updated; when the communication data is state quantity data, the communication data is continuously sent to the receiving CPU according to a preset time interval, and whether the communication data is data required by the receiving CPU is judged; and if so , the receiving CPU data table is updated, or if not, the communication data is discarded, the error number and the total receiving number of the receiving CPU are accumulated, and the receiving CPU data table is updated. Under the premise that a wiring layout is not changed, CPU communication interaction data under various working conditions are tested and verified, and no interference is caused to normal data; and the detection method is real and effective and can be conveniently developed in various application environments of a power system protection device.