183results about How to "Fast fault location" patented technology

A monitoring system for detecting earth faults in an electrical power supply grid providing a power signal includes a plurality of monitoring devices, each of the monitoring devices including a detector for detecting the level of harmonics in the power signal, wherein the level of harmonics is detected in a specific frequency range. Each of the monitoring devices further includes a memory for storing a harmonics reference value, a processor for comparing the detected level of harmonics with the reference level, and a communication device for transmitting an alarm if the detected level of harmonics is above the reference level for a specific period of time. Each of the detectors includes an optical sensor for detecting the harmonics by use of the Faraday effect.

The present invention relates to a method for locating single-phase ground fault of a low current grounding system power distribution network, including determining a total length L[total] and a total impedance Z[total] between two lines of M and N, and injecting signals when occurring a fault, when a P point between the M and N positions occurring a single-phase ground fault, systems of the two positions inject signals at the M and N position, and measures the amplitude of a return current signal as well as a phase difference between the return current signal and the injection voltage signal, after a line selection device has selected the fault phase; calculating a loop total impedance Z[M] grounded through the P point from the M and N ends, the modulo of the Z[N], and a phase angle Phi[M] of the Z[M] and the Z[N], according to |Z| = |U| / |I|, the measured injection voltage, the amplitude of the return current signal and the phase difference, a distance from the fault point P to the M position is further calculated through the following formula. By the method of the invention, it is easy to detect when the signal amplitude is strong, the attrition in the power distribution network is low, the algorithm is high, and the accuracy is high.

The invention discloses an interactive electronic technical manual browsing system, which is characterized by being a three-layer running mode based on network connection, that is a data layer (1), anintermediate layer (2) and an express layer (3), wherein the data layer (1) is a Common Source Data Base(CSDB); the intermediate layer (2) comprises a data ADO.NET data access model (4) and a Web server ASP.NET (5); the data access model (4) extracts and saves data from the data layer (1); the Web server ASP.NET (5) processes, maintains and guarantees service logic and service rule which are related with technical data; the express layer (3) is a client browser; the system can directly use the technical data of XML format; information elements can be used by a plurality of systems, such as anIETM, CBT(based on the training of a computer), a WBT(based on the training of network) and the like, for many times and are easy to update; and the interactive electronic technical manual browsing system can realize convenient and quick information search of a plurality of channels, can be integrated with an expert system and the CBT to enhance fault positioning, realizes real-time training, andhas simple and convenient operation and friendly interface.

The invention discloses a method for processing boundary information deficiency of a centralization protector of a digitalized converting station, which comprises the following steps that: the centralization protector collects current and voltage values of the whole converting station and the states of circuit breakers, and acquires voltage and current sampling value information of the whole converting station in real time; when faults happen, if the current sampling value information of one line is deficient, a current sampling value of the information deficient line is synthesized on the premise that a bus is supposed to have no faults, and then a bus voltage and a line current sampling value are used, wherein the information deficient line adopts a resultant current, and the faults are removed through conventional line protection; and if the faults are detected on a first section of the conventional protection of the information deficient line, the circuit breaker of the line is tripped off without delay, and then the conventional bus differential protection is used for detecting whether the bus has the faults or not so as to determine whether to trip off all the circuit breakers connected with the bus. The method can quickly position the faults and remove the faults of boundary regions, greatly simplifies the cooperating setting of protection, and improves the reliability of the protection.

The invention relates to a transformer station equipment cloud maintenance system and a monitoring system. The cloud maintenance system comprises a transformer station monitoring subsystem and a remote maintenance subsystem, wherein the transformer station monitoring subsystem comprises a monitoring layer and an evaluation layer, the monitoring layer is used for monitoring the relevant state information of transformer station equipment and outputting the state information to a server of the evaluation layer to acquire health status data of the transformer station equipment, and the remote maintenance subsystem comprises a cloud maintenance work station in remote communication connection with the evaluation server through the network and is used for receiving the health status data of the transformer station equipment sent by the evaluation server. The system is stored with all the operation state information of the whole far-end transmission transformer station, the health status data of the transformer station equipment is acquired through far-end transmission, the data is not scattered data, data bulk is relatively small, so loss of the data does not easily occur, and the cloud maintenance work station further does not misjudge the operation state of the transformer station.

The invention relates to a fault locating method and system of an active power distribution network. The method comprises the following steps that 1 fault current constant values of feeder terminals are set to be higher than the largest load current; 2 when the active power distribution network has faults, fault detection is started for the feeder terminal through which a fault current passes, and a short-circuit current measurement value is submitted to a power distribution network system master station; 3 the power distribution network system master station resets a fault current constant value according to the short-circuit current, passing through an outlet breaker, submitted by a circuit outlet switch feeder terminal and then judges whether the fault current passes through a switch of one certain circuit, and the fault section is recognized by adopting a common fault locating method. The system comprises the power distribution network master station, the feeder terminals and a communication system, and the power distribution network master station is connected with all the feeder terminals through the communication system to achieve information exchange. The method and system can locate the faults easily and rapidly, easy to achieve and good in use effect.

The invention discloses a method for testing a radio-frequency hardware module. The method comprises dividing each test task of the radio-frequency hardware module into a plurality of test subtasks in the test process. During the test task, the test subtasks are executed in order, if the current test subtask is executed successfully, the next test subtask is executed; when the test subtask is overtime or abnormal, the test task is terminated immediately, and a current test task mark, a current test subtask mark and the corresponding fault information are output at the same time. The test method for the radio-frequency hardware module, provided in the invention, divides each test task into a plurality of the test subtasks, which has the advantages that a user can efficiently control the test and obtain important test information during the test process; and that the method realizes the rapid fault location and facilitates the maintenance and transplantation of programs.

The invention provides a distribution network fault location method based on an improved quantum cuckoo algorithm. Distribution network fault location is modeled into high-dimensional combination optimization; a distribution network fault location section is expressed by using a quantum double-chain code; with an improved Levy flight algorithm, updating of a value of each dimension of a quantum cuckoo algorithm is optimized; and the quantum double-chain code is processed by variation by combining a differential evolution algorithm, so that an optimal solution to the distribution network fault location combination and an optimal solution is calculated. According to the invention, an optimized objective function of the distribution network fault location model is established; optimization calculation of the objective function is performed based on the improved quantum cuckoo algorithm; a fault section is identified; and verification is performed by using a distribution network example. Moreover, fault point location under the condition of multi-point simultaneous fault occurrence can be processed.

The invention discloses a method for determining the state of testing hardware by using statistical test data in the process of testing a wafer of an integrated circuit. The test data generated in the process of testing the wafer reflects the physical parameter of each chip, the function of an internal module, a manufacturing process of each chip, and the state of the testing hardware in the testing process. By a site yield statistical method for a multi-site parallel test, whether the state of the testing hardware in the testing process is defective or not is checked. By the method, the yield of each site is obtained through the statistical induction of massive test data, and specific bin value distribution is obtained, so that the failure cause of the testing hardware can be quickly found, solution measures are taken, and test quality is ensured.

The invention discloses a quick protection method applicable to an intelligent distribution network. The method is that a current break variable starting element is utilized to start protection; adjacent protection devices exchange information; the protection is started from the downstream of a distribution circuit in which fault current is detected, and a circuit breaker at each protecting part is sequentially tripped off until reaching the upstream of the circuit, so that whether the fault current occurs in can be determined through adjacent protection devices before tripping off the circuit breaker to achieve fault positioning and fault isolation; meanwhile, an interconnection switch of each circuit is utilized to quickly recover from fault. With the adoption of the method, the quick fault positioning, fault isolation and recovery from fault of the distribution circuit can be achieved; the fault time is reduced; the power restoration of a non-fault power-off area is sped up; therefore, the power supply reliability is improved; the conflict between a distributed power supply and quick protection of the distribution network can be solved; in addition, the advantage of the network structure with high power supply capacity of the intelligent distribution network can be brought into full play, and the intelligent distribution network can be adapted well.

The invention relates to an active power distribution network fault positioning method based on current polarity comparison. Each detection point of an active power distribution network feed line is provided with a switch and an FTU, the FTUs are in information interaction via communication network. The FTUs detect the fault current in real time, the current abrupt change time is taken as the fault starting point, the fault current signal of half cycle after the fault is recorded, the polarity is calculated according to the data of the half cycle, and the fault positioning is realized by comparing the polarity of the fault current of the adjacent detection points. In addition, when the fault positioning credibility is low and missed reporting occurs, the data detected at the downstream replaces the detection point data to realize the fault positioning, so that the method has a certain fault tolerance capability. The high-precision fault positioning of the active power distribution network including a distributed power supply can be realized, and the rapid fault positioning can be realized as well, so that the requirement of the active power distribution network can be met. The method further supports the power distribution network of the high-permeability distributed power supply, and facilitates the promotion of energy saving and emission reduction and smart grid construction.

The invention relates to a current fault component-based substation area backup protection method and system. The method comprises the following steps: 1) a substation area backup protection boundarycondition is determined; 2) differential areas with a boundary differential area and a component differential area covering different protection ranges are determined; and 3) substation area backup protection recognizes a fault position according to defined differential judgment of each differential area, and the original main protection action condition of the component, a power grid topology structure and a breaking state of a circuit breaker are integrated to realize high-performance backup protection for the substation. According to the current fault component-based substation area backupprotection method, various different types of fault in intra-station and inter-station lines can be quickly and reliably recognized, a tripping area can be expanded automatically when the circuit breaker fails to operate, the fault positioning time can be effectively shortened in the current fault component-based search scheme, and the safety of the power grid can be greatly ensured.

The invention discloses a network analog simulation system for a large-scale integrated data network based on NS-3. The network analog simulation system is characterized by comprising three subsystems: a visualization system (1), an analog simulation system (2) and a network operation analysis system (3). A framework used by the network analog simulation system compensates and perfects the defect of an existing NS-3 function module; 22 function modules systematically built based on an NS-3 platform and a parallel module provide an omnibearing function support for the simulation of the integrated data network. According to the network analog simulation system, technologies of route analysis, flow analysis, data network element analysis and the like can be integrated based on overall operating status data of the integrated data network; through the realization of the framework, a simulation platform for rapid fault location and diagnosis and network performance analysis can be provided at high efficiency and high precision.

The invention belongs to the technical field of power system fault positioning and discloses a fault location method for two ends of a line irrelevant with transition resistance and load current. The fault location method comprises that a fault location device detects positive and negative sequence voltage and positive and negative sequence current of the two ends of the power transmission line, performs distributed current compensation to the positive and negative sequence voltage and the positive and negative sequence current of the two ends of the power transmission line and then utilizes the positive and negative sequence voltage and positive and compensated negative sequence current of the two ends of the power transmission line to directly calculate fault positions. The fault location method is applied to quick fault positioning of the two ends of the power transmission line, influence of distributed capacitance to the accuracy of positioning results is eliminated, the fault positions are not required to be calculated by means of a search algorithm, operation quantity is low, and the fault positioning speed is high. The fault location method utilizes double-end sequence components to achieve the fault positioning of the two ends of the power transmission line, is suitable for the fault positioning of the whole fault process of any fault of the power transmission line and has universal applicability.

The invention discloses a fault traveling wave location method of multiple branch lines of a power distribution network. According to the method of the invention, traveling wave recording devices are installed at the head end of a trunk line, the tail end of the trunk line and the tail ends of the branch lines of a detected power distribution line; time for head-end reference traveling wave signals, tail-end reference traveling wave signals and fault traveling wave signals to arrive the head end of the trunk line, the tail end of the trunk line and the tail ends of the branch lines is acquired respectively through the traveling wave recording devices; based on a theory that traveling waves are transmitted according a shortest path of a line and traveling wave transmission characteristics in line faults, the branch lines are judged with different sequences according to a first condition formula and a second condition formula, and therefore, fault intervals of the multiple branch lines of the power distribution network can be determined fast and accurately; and calculation is carried out through a double-end traveling wave fault location formula, so that the positions of fault points of the lines can be located accurately. The method of the invention has the advantages of fast and accurate fault location and small calculation quantity, and can assist in shortening power outage time, decreasing a power outage range, and improving the power supply reliability of the power distribution network.

The invention discloses a locating device for fault discharge of a cable. The locating device is characterized by comprising an optical fiber vibration module, a sensing optical fiber, a high-voltage cable, a high-voltage pulse module, and a data acquisition system, wherein the optical fiber vibration module is connected with the sensing optical fiber and is laid along the high-voltage cable; the high-voltage pulse module outputs a pulse signal which is injected into the high-voltage cable; a vibration signal is generated at a discharge point of the high-voltage cable , and then is returned to the optical fiber vibration module through the sensing optical fiber; the data acquisition system acquires a distributed vibration signal which is measured by the optical fiber vibration module and along the cable and a synchronous pulse signal of the high-voltage pulse module and then sends the signals to a data processor which analyzes and processes the signals to obtain the specific location of the discharge point. Due to the adoption of the structure, the locating device can locate a fault accurately so as to save the human resources and reduce the waste of cable caused by maintenance, is high in fault locating speed and can locate the fault point within several minutes in case of the fault discharge of the cable so as to shorten the fault recovery time of the high-voltage cable; moreover, the device can locate a plurality of fault discharge points at the same time so as to implement a real distributed cable fault location.