132 results about "Digital protection" patented technology

The invention discloses a digital protecting tester which comprises a PWF main control board, a FT3 board, an input measuring board, an output measuring board, an Ethernet interface and an optical fiber interface. An automatic closed loop test system comprises a computer, a network connecting device and the digital protecting tester, and the digital protecting tester is connected with a protecting device by the optical fiber interface and is used for sending a sampling value and issuing/subscribing GOOSE information. An automatic closed loop test method comprises the following steps of: establishing a test task according to a test plan by a tester, automatically configuring GOOSE parameters and automatically reading/writing the set value of a relay protecting device; simulating a fault according to the test task and the protecting set value and automatically analyzing GOOSE data to obtain a test result; automatically reading the sampling value of the relay protecting device; automatically reading the switching-off/switching-on report of the protecting device; and automatically generating a complete test report by software after completing test. By the invention, the automatic test can be completed, the test efficiency is improved, and the workload of the tester is lightened.

The invention provides an automatic testing system and an automatic testing method for an intelligent transformer substation digital protection device. The system comprises a digital protection testing instrument and a tested digital protection device which are connected, and is characterized by also comprising an exchanger and a testing machine, the digital protection testing instrument and the tested digital protection device are connected through optical fibers, the testing machine is connected with the exchanger through a network cable, and the exchanger is respectively connected with the digital protection testing instrument and the tested digital protection device through network cables. The system and the method provided by the invention have the advantages that the problems of testing data format disunity, low testing work efficiency and excessive relying on personal ability of the technology and the mode in the digital protection device inspection process are solved, and the goals of reducing the personnel requirements, simplifying the work process and standardizing the data form are reached.

The invention relates to a low-voltage intelligent circuit breaker with a plastic shell. The low-voltage intelligent circuit breaker comprises a switch base and a switch cover, wherein the switch base is provided with four longitudinal through grooves and a transverse through groove penetrating through the longitudinal through grooves, a vacuum electromagnetic switch, a current transformer and a storage capacitor are sequentially installed in three longitudinal through grooves; another vacuum electromagnetic switch and another storage capacitor are sequentially installed in the other longitudinal through grooves, and a zero sequence transformer is installed in the transverse through groove; and a control circuit board is fixed at the upper middle of the switch base, a power module, a charging module, a phasing voltage transformer, three voltage transformer for phase selection, two main processors and two auxiliary processors, wherein the display circuit board is located in the upper middle of the control circuit board and embedded in the switch cover and provided with a display screen, a red indication lamp, a green indication lamp, a switching-in operation button, a switching-off operation button and the like. The invention has the advantages of small volume, compact structure, convenience for use and installation and capability of truly realizing comprehensive intelligence of digital protection, automatic control and communication function.

A digital protection and control device is so configured that at least parts of a digital data merging unit coupled to sensor units by a transmission medium, a protection and control unit, a communication unit for component control devices coupled to component control devices by a transmission medium, and a process bus communication unit are coupled by a parallel transmission medium, and at least a part of data exchange is based on a multimaster mode. Transmission based on the multimaster mode enables each unit to transmit/receive data independently and enables the reduction in unbalanced communication load. As a result, such a risk can be reduced that time responsiveness of operation is lowered as the entire digital protection and control device due to unbalanced concentration of data bus processing in a particular unit.

The invention discloses an integration testing method and system for a digital protection system of a high temperature gas cooled reactor and belongs to the technical field of the nuclear reactor. The method comprises the following steps of: S1, starting a corresponding testing module according to a testing instrument, and calling a testing algorithm corresponding to the function of the testing module so as to generating a testing vector of a monitoring variable of the digital protection system of the high temperature gas cooled reactor; S2, calculating and converting the testing vector to generating a signal in accordance with an interface of the protection system, and simultaneously, sending the generated simulated monitoring variable signal to signal input interfaces of a plurality of redundant channels of the protection system; and S3, acquiring testing data in real-time, carrying out comparison and statistic analysis on the acquired testing data and the predicted result, and judging whether the safety function and performance of the protection system has met the predicted requirements according to the results of comparison and statistic analysis. The invention can be used for determining whether the safety function and performance has met the predicted requirements at the system integration stage of the protection system.

The invention relates to a system for realizing automatic digital relay protection and closed loop moving die test. The system comprises a host computer, network connection equipment, a real-time emulation conversion device and a power system digital emulation device which are all used for processing information and arranged for real-time emulation conversion device configuration; the real-time emulation conversion device is connected with the host computer through the network connection equipment; the power system digital emulation device is connected with the real-time emulation conversion device; the network connection equipment and the real-time emulation conversion device are respectively connected with a relay protection device to be tested; and the real-time emulation conversion device comprises a main control panel, an A/D(Analog Signal to Digital Signal) collecting panel, a switching on or off quantity panel, a power panel, a synchronous interface panel, an FT (Functional Test) 3 panel, an Ethernet interface and an optical interface. The invention solves the problem of moving die test of a digital relay protection device and provides a convenient and high-efficient test method.

The invention discloses a power distribution network distributed differential protection method and system based on a 5G network. The method comprises the steps: in the case of signal transmission between digital protection devices, a communication channel based on the 5G network is used for communication, thereby achieving data interaction between the two digital protection devices; a 5G slice network is used as a communication channel, the communication security is ensured, and on the basis of the low time delay characteristic of 5G communication, a data link is optimized through the slice network to minimize the link transmission hop count and further reduce the time delay of data transmission; the digital protection devices are used to simultaneously carry out overcurrent detection oncurrents at two ends of a power distribution network line, the respective overcurrent moment is taken as a synchronization time reference of the digital protection devices at two ends of the line, once overcurrent is detected, the digital protection devices start, starting signals are sent to opposite ends, and after the digital protection devices start, current fault component values after faultstarting are calculated, and after calculation, current fault component data are transmitted to the opposite ends.

The digital protection system for a high voltage electricity network to instruct circuit breakers to open in the event of faults being detected by current and/or voltage sensors on the network lines connected to the circuit breakers includes a radio link for transmitting data with a mobile telephone of the "Bluetooth" type.

The invention relates to a digital protection tester with a fault data model base for protection testing, comprising an ARM (Advanced RISC Machines) processor, a DSP (digital signal processor), 8 inputs and 4 outputs, a FT3 plate, and a GPS (global positioning system) interface, wherein the ARM processor is connected with a host computer through an Ethernet interface, and are respectively connected three optical interfaces (A,B, C) to output data messages to a digital protection device to be tested through the Ethernet; the DSP is connected with the ARM processor through an HPI (hardware platform interface); the 8 input paths and 4 output paths are hung an external parallel I/O bus of the DSP; the FT3 plate is hung on the external parallel I/O bus of the DSP; the FT3 plate on an FPGA (Field Programmable Gate Array) has 12 weak signal output terminals and 3 groups of message output terminals and optical B-code interfaces meeting the standard of IEC60044-8; and the GPS interface is connected with the ARM processor; and the digital protection tester also has an abnormal data restoration and reproduction device. The digital protection tester can determine the effectiveness of the malfunction prevention measures of the digital protection device according to the fault data model base, thereby perfecting the performance of the digital protection device.

The invention discloses a synchronous sampling method achieving the hybrid access of an analog quantity and a digital quantity, and belongs to intelligent substation digital protection. The condition that the simultaneous and direct access of the analog quantity input of an electromagnetic transformer and the digital quantity input of a merging unit is achieved happens to an intelligent substation digital protection device. According to the method, the sampling pulse with an adjustable time interval generated in the digital protection device is used as the standard. On one hand, a built-in AD module of the protection device is started, and AD conversion is carried out on analog quantity input. On the other hand, according to rated time delay, the interpolation time of a digital quantity input data frame is determined, the one-time system electrical quantity, corresponding to the sampling pulse time, of the digital quantity input is calculated through a Lagrange's interpolation method, and therefore synchronous sampling of the digital quantity input and the analog quantity input is achieved. The time interval of the sampling pulse can be adjusted according to signal frequency measured in real time, and equal-angle sampling is achieved to reduce spectrum leakage.

The process is intended to optimize the operation of a digital protection system for protecting sets of busbars in the power station and uses a basic schematic of the electrical configuration of the power station obtained from information on the type of components used in the power station, and on the possible connections and accesses to said components. The information is assigned to management units of the digital protection system, said management units comprising peripheral measurement units and at least one centralization unit. A topological compilation process is implemented to provide a compiled schematic topology, and to provide a compiled assignment topology of the components in the power station and of their connections to the management units. A partial graph, whose structure depends on the type of information searched for and the status of each component of the power station, is obtained for each peripheral unit. A complete graph is then computed in one or more centralization units by algorithms which superpose partial graphs.

The invention discloses a low-voltage intelligent circuit breaker which comprises a shell; the shell comprises a left end closure, a right end closure and at least one standard middle module which are connected into a whole body by rivets/screws; a main circuit board and a control circuit board are arranged in the inner chamber of the shell; an electric current mutual inductor, a voltage mutual inductor and a zero sequence mutual inductor, a temperature sensor, an energy-storage capacitor, an electromagnetic switch and a Hall sensor are arranged on the main circuit board, wherein the Hall sensor is arranged on the electromagnetic switch; a MCU (microprogrammed control unit) processor and a communication socket are arranged on the control circuit board; an operating button and a red and a green indicator lights are arranged at the obverse side of the shell; power input/output binding posts are respectively embedded in the middle parts of the upper side surface and the lower side surface of the shell; and standard communication sockets, which are connected with the control circuit board, are respectively fixed on the left end closure and the right end closure. The low-voltage intelligent circuit breaker has the advantages of small volume, compact structure, reliability for fixation, standardized and modular design, and convenience for use and install and the complete intellectualization of digital protection, automatic control and communication functions are really implementated.

The invention provides a production method of a digital glazed ceramic tile. The production method comprises the following steps of preparing a green brick and drying for later use, applying a layer of engobe on the green bricks and drying for later use, carrying out digital glaze texture pattern printing on the engobe applied and dried green brick, spraying cover glaze on the green brick printed with the digital glaze texture pattern, and drying for later use, carrying out color ink-jet printing on the green brick after the cover glaze is applied and the green brick is dried, carrying out digital protection glaze printing on the green brick with the printed pattern, and sintering the green brick in a roller kiln to obtain a finished product of the digital glaze ceramic tile. According to the production method of the digital glaze ceramic tile, the effect is finer, the surface texture is finer, the concave-convex details are rich, the concave-convex effect of the product is good, the concave-convex surface transition is natural, personalized customization production can be conveniently carried out, the requirements of consumers can be better met, and the market prospect is wide.

The invention discloses a nuclear power station digital protection control system. The system comprises at least one sub protection control system, the sub protection control system comprises three mutually independent safety protection cabinets, each safety protection cabinet performs threshold determining on received onsite acquisition signals and sends a determination result to other safety protection cabinets, and the safety protection cabinets receiving the determination results perform logic operation on the received determination results with the determination results of their own and take results of the logic operation as motion instructions of the cabinets for external output. Compared to the prior art, through designing a digital computer control system and providing the multiple sub protection control systems with logic operation and determining functions, misoperation and failure operation probabilities of the control system are substantially reduced, and the reliability, the visibility and the operability of the control system are improved.

Optical glasses are described, which are useful for imaging, sensors, microscopy, medical technology, digital protection, photolithography, laser technology, wafer/chip technology, as well as telecommunication, optical communications engineering and optics/lighting in the automotive sector, with a refractive index of 1.80≦n_d≦1.95 and an Abbe value from 19≦ν_d≦28 with excellent chemical resistance and stability to crystallization. These optical glasses have a composition, in weight % based on oxide content, of: P₂O₅, 14-35; Nb₂O₅, 45-50; Li₂O, 0-4; Na₂O, 0-4; K₂O, 0.5-5; BaO, 17-23; ZnO, 0.1-5; TiO₂, 1-<5; ZrO₂, 06; and Sb₂O₃, 0.1-2.

The invention discloses a panoramic real-time simulation method for a power system, which comprises the following steps: respectively constructing a primary system model and a secondary system model of a substation; writing the simulation data of each step into the real-time database after the system model is calculated once. Once the system model has computed and written simulation data of any step size to the real-time database, the secondary system model collects the data from the real-time database; simultaneously, the primary system model transmits the simulation data to the signal converting device, and if the primary system model receives the action information sent by the secondary system model and simultaneously receives the information returned to the primary system model by thesignal converting device, the simulation is carried out according to the topology structure formed at present. The invention coordinates and synchronizes the primary system simulation, the secondary equipment simulation and part of the real secondary equipment, and has the interoperability, thereby forming a complete simulation test system, which can ensure the seamless docking of the simulation platform with the real secondary equipment and the virtual digital protection.

The invention relates to a method for testing influence of distortion data on a relay protection device, comprising the following steps of: (1) constructing a dynamic simulation test system; (2) dynamically simulating an emulation system to generate sampling data needed by a normal running test, a fault test inside a protected area and a fault test outside the protected area and transmitting the sampling data to a fault oscillograph through an electronic mutual inductor merging unit; (3) transmitting the sampling data into a digital protection test device by the fault oscillograph, respectively adjusting the data of normal running, the fault inside the protected area and the fault outside the protected area and transmitting the adjusted data to the relay protection device and the fault oscillograph; and (4) analyzing the influence of the distortion data on the relay protection device according to action messages recorded in the relay protection device in the fault oscillograph. The invention provides the method for effectively testing the influence of the distortion data of the electronic mutual inductor for the relay protection device, ensures the reliable running of a digital transformer substation and has the characteristics of simple implementation method, accuracy and reliability.

The invention discloses a 3D panoramic camera system including a base, a rotary object bench, a camera array beam, a stable support, camera supports and cameras. The rotary object bench is installed on the base. One end of the camera array beam is fixed to the base, and the other end is fixed to the stable support which is fixed onto the base. The camera supports are evenly distributed on a quarter of a circular arc segment of the camera array beam. Two cameras are installed on each camera support symmetrically, and the axes of lenses of the two cameras intersect at the center of the bench surface of the rotary object bench. The system can achieve 3D continuous and panoramic image acquisition covering 360 degrees horizontally and 180 degrees vertically. An image file can be displayed like a real object. A viewer can take a view from any angle. The system is especially suitable for digital protection and display of precious cultural relics in museums and facilitates E-commerce after naked-eye 3D displays are more and more popular.

The invention relates to a negative testing method applicable to standard and digital relay protective devices, which is characterized by simulating possible abnormal conditions in a data interaction process of a digital relay protection device according to the configuration of a user and testing the abnormal condition handling capacities of the digital relay protection device, wherein abnormal condition handling capacities comprise a capacity for handling test message destination address errors and data errors and a capacity for handling delayed test message transmission. The test of whether a digital protection device has an abnormal optical fiber communication condition handling capacity under a condition of sound operation of optical fibers in an initial test stage is difficult, so artificially simulation of abnormal optical fiber communication conditions is necessary for testing the abnormal optical fiber communication condition handling capacity of the digital protection device. Through the customization of output messages of a digital relay protection tester, possible abnormal communication conditions can be simulated artificially, so the problem of testing the abnormal communication condition handling capacity of the digital relay protection device is solved.

The invention discloses a lost sample data processing method based on mathematic models of current and voltage, which is characterized by comprising the following steps: during monitoring device communications in real time, when discovering the sample data frames are abnormal, taking valid sample data of K consecutive points from the present point in a protected sample data buffer according to the sampling frequency of a sample data combination unit, calculating the waveform expressions of the present current and voltage, fitting the waveform, then calculating the approximation of the lost sample data by a method of interpolation and marking the corresponding states of the data as estimation until the device receives the correct sample data frames, wherein K is at least 3. The invention provides a sample data interpolation method based on mathematic models of current and voltage, which can solve the problem of delaying or locking of the actions of digital protection devices due to incomplete data sources caused by frame loss/frame error.

According to one embodiment, a digital protection relay includes an auxiliary transformer (2) which decreases a voltage of an electrical signal from a main circuit transformer (1) to a predetermined voltage; a detection resistance circuit (20) including a Π-type or T-type circuit including an input connected to an output of the auxiliary transformer (2); an analog detection circuit (3) which is connected to an output of the detection resistance circuit (20) and detects a quantity of electricity of an electrical signal from the auxiliary transformer (2); an A/D conversion circuit (4) connected to the analog detection circuit (3); a central processing device 5 which is connected to the A/D conversion circuit (5) and performs a protection operation; and a trip output contact (9) which is closed by processing of the central processing device (5) and operates an external breaker (21). In the digital protection relay, an input contact terminal 11 for inputting a test signal with a constant voltage from an external test device (13) to the analog detection circuit (3) as a signal corresponding to an output of the auxiliary transformer (2) is provided between the detection resistance circuit (20) and the analog detection circuit (3).

A digital transformer substation testing system is characterized by comprising a simulation tool, a fault management tool, simulation testing devices and a GPS device, wherein the simulation tool simulates voltage and current curve data of nodes under various kinds of working conditions of a target transformer substation; the fault management tool processes the voltage and current curve data to obtain fault data files in a unified format, combines the fault data files with SCD files of a digital transformer substation, and generates a fault engineering file for each digital protection device in the target transformer substation; the simulation testing devices generate digitalized process level data messages according to the fault engineering files; and the GPS device calibrates time of the simulation testing devices and triggers them, and carries out synchronous tests on the digital protection devices inside or between the target transformer substations. The digital transformer substation testing system utilizes power system simulation computing software for simulating state variations of the target transformer substation under various kinds of working conditions, and is clear in principle and simple in method.

The invention provides a protection device and a protection method for a current collecting line of a wind power plant. The protection device comprises at least one merging unit, a digital protection unit, at least one set of box-type transformer substation terminal equipment and one set of current collecting line terminal equipment, wherein the merging unit is used for converting simulation signals acquired from a box-type transformer substation and the current collecting line into digital signals; the digital protection unit is electrically connected with the at least one merging unit through a first transmission line, and is used for judging whether the box-type transformer substation and/or the current collecting line need to be tripped, and sending corresponding tripping signals when the box-type transformer substation and/or the current collecting line need to be tripped; the box-type transformer substation terminal equipment is connected with the digital protection unit through a second transmission line, and is used for receiving the tripping signal and giving a tripping command to the box-type transformer substation; and the current collecting line terminal equipment is connected with the digital protection unit through a second transmission line, and is used for receiving the tripping signal and giving a tripping command to the current collecting line. The protection device can avoid the override tripping phenomenon in the prior art.