1773 results about "Feeder line" patented technology

A method and system to expand digital transmission capacity in a "tree and branch" coax distribution system employing distributed TV signal amplifiers. Specifically, a number of separate bands are used in a main feeder cable that are frequency shifted and applied to a number of local coax distribution networks. In the preferred embodiment each of the local coax distribution networks use the same pair of upstream and downstream frequencies. Using identical pairs of upstream and downstream frequencies allows the use of a single standardized non-tuning end-user data interface (client modem), that can be connected to any of the local coax distribution networks. This abstract is provided as a tool for those searching for patents, and not as a limitation on the scope of the claims.

An apparatus and method are provided for controlling a wireless feeder network used to couple access base stations of an access network with a communications network. The wireless feeder network connects base stations coupled to the communications network and feeder terminals coupled to associated access base stations. Each feeder terminal has a feeder link with a feeder base station. The method includes allocating resource blocks for the feeder base stations and feeder terminals to establish the feeder links. The resource blocks are allocated between a centrally administered schedule and at least one feeder base station administered schedule. Network traffic being carried by the feeder links is monitored to determine at least one characteristic. The resource blocks are reallocated between the centrally administered schedule and the at least one feeder base station administered schedule in dependence on the at least one characteristic of the network traffic.

A dynamic layer diagnostic device for smart power grid fault comprises a data collection and monitoring unit, a data processing unit, a data base unit, a communication unit and a man-machine interaction unit. A dynamic layer diagnostic method includes: when a smart power grid breaks down, calculating fault diagnosis starting conditions to conform a diagnosis strategy, wherein the fault diagnosis strategy comprises switch layer diagnosis, feeder layer diagnosis and transformer substation layer diagnosis; starting the switch layer diagnosis when changes of switch motion information are remarkable before and after the fault; starting the transformer substation diagnosis when changes of electricity amount information are remarkable before and after the fault; stopping the diagnosis when a fault element is the only one element during the diagnosis of the switch layer; otherwise, retrieving the switch historical action recording, and starting the transformer substation diagnosis when recording matched with the current switch action exists; and otherwise, starting the feeder layer diagnosis. The dynamic layer diagnostic method performs layering analysis on the fault, fully utilizes various fault information and improves fault diagnosis accuracy according to different characteristics of multisource information after the power grid fault and difficulty layer in obtaining and processing of various information.

The invention provides a method and a device for online fault search positioning of a multi-branch complex distribution network. The method comprises collecting topology information and electric capacity information of the distribution network to perform calculation to obtain voltage values of all nodes and current values of circuits of the distribution network; then establishing a distribution network equivalent model; determining fault types and fault phases of the distribution network by means of the fault line selection technique, and performing load compensation on the load fluctuation of the distribution network according to real-time data of initial end voltage and current of a feeder line of the distribution network; and performing sectional flow calculation on the distribution network, performing fault positioning algorithm on the current distribution network load value obtained by load compensation, and performing searching section by section until a fault section and a fault point are found out. The method and the device for the online fault search positioning of the multi-branch complex distribution network can be applied to the multi-branch complex distribution network, are capable of achieving online fault positioning, shorten fault repairing time, improve positioning accuracy and reduce investment cost.

A preferred embodiment of a system comprises a recloser electrically coupled to a voltage source of a power-distribution network and adapted to isolate a section of a distribution feeder of the power-distribution network from the voltage source in response to an overcurrent condition in the section of the distribution feeder. The system also comprises a sectionalizer electrically coupled to the section of the distribution feeder. The sectionalizer and the recloser are adapted to communicate via a data network and the recloser is responsive to control inputs sent to the recloser from the sectionalizer over the data network.

A digital all-optical distributed system allowing multiple-service access is characterized by comprising an access unit, an expansion unit and a remote unit, wherein the access unit and the expansion unit are connected through optical fiber, and the expansion unit and the remote unit are connected through optical fiber; the access unit or the expansion unit is connected with the network, and the remote unit is connected with the network; and a switching unit can be further arranged and is connected with the access unit which is used for 1+1 backup through a feeder line cable and optical fiber. The access unit in the system couples multiple service radio-frequency signals from a signal source, converts the signals into digital baseband signals and transmits the digital baseband signals to the expansion unit, the expansion unit realizes shunting of digital baseband downlink signals and combining of digital baseband uplink signals and transmits the digital baseband signals to the remote unit through optical fiber. The system can provide services such as wireless access, fixed network broadband, WLAN (wireless local area network) signal transmission and the like, can develop multiple functions on the basis of digital intermediate frequency and can support star, daisy chain and mixed networking.

The invention provides a fault line selection method based on time domain waveform correlation analysis of a three-phase current breaking variable, and belongs to the technical field of electric system relay protection. The method includes the steps that as for a power distribution network with a feed-out line only provided with a three-phase current mutual inductor and not provided with a zero sequence current mutual inductor, when single-phase earth fault of the power distribution network occurs, a device is immediately started, and three-phase breaking currents of feeder lines on measurement positions are measured. A three-phase breaking current time domain waveform inside a time window 5 milliseconds after the fault occurs is extracted, correlation analysis of the three-phase breaking current time domain waveform is carried out to acquire an interphase correlation coefficient and a comprehensive correlation coefficient, the comprehensive correlation coefficient and the interphase correlation coefficient respectively serve as a line selection criterion characteristic quantity and a phase selection criterion characteristic quantity, and line selection and phase selection of the distribution network single-phase earth fault are achieved according to criterion principles. Theoretical analysis and a great quantity of emulation indicate that the fault line selection method is good in effect.

The invention relates to a digital transformer station protection control method and a multifunctional protection controller thereof, which belongs to the technical field of relay protection of the electric power system. The method comprises the following steps: a merging unit and an intelligent switch grouping unit of the digital transformer station perform message analysis and calculation to all groups of received message data to obtain the measured value of each group the message data; whether the starting of each group is satisfactory or not is detected by using the measured values, and whether the electric apparatus is out of service or not or in a normal working state is judged; the measured values of the group and the other groups and the computing result form wide area information together; and the protection and control functions of a feeder line, a transformer, a bus and a capacitor bank in the digital transformer station are performed. The controller mainly comprises a monitoring module and a plurality of functional modules. The invention realizes the comprehensive integration of protection and control of the digital transformer station. Furthermore, the invention can reduce the investment cost as well as the work load of running and maintenance, enhance the protection and control performance and enhance the security and the reliability of running of the transformer station.

The invention relates to the technical field of composition of optical cables and electric cables, in particular to a photoelectricity composite cable with a flexible metallic sheath. The photoelectricity composite cable with the flexible metallic sheath comprises a central strengthening piece, a plurality of feeder lines and a plurality of optical transmission units distributed around the central strengthening piece, a wrapping tape layer coated on the feeder lines and the optical transmission units, a metallic shield armor layer outside the wrapping tape layer, and an outer sheath coated outside the metallic shield armor layer, wherein each feeder lines is composed of an inner conductor layer and an outer insulation layer. The photoelectricity composite cable with the flexible metallic sheath is characterized in that the each optical transmission unit is composed of a plurality of tight-buffered optical fibers, a strengthening core coated outside the tight-buffered optical fibers, and a sheath layer coated outside the strengthening core. The conductor layers are made of flexible conductors. The metallic shield armor layer is made of a corrugation aluminum tube. The photoelectricity composite cable with the flexible metallic sheath has the advantages of being flexible in structure, easy to construct, and high in tensile strength.

The invention provides an on-site coinciding type fault isolation method and system. The method comprises the steps of controlling a transformer substation outgoing breaker or a first section breaker of a main feeder for sequentially forming tripping and single shot reclosing, and isolating a main feeder fault; setting the action delay time of a branch circuit breaker to be shorter than the action delay time of the transformer substation outgoing breaker and the section breaker, and controlling the branch circuit breaker to sequentially perform tripping and single shot reclosing to isolate a main feeder branch circuit fault; setting the action delay time of a user dividing circuit breaker to be shorter than the action delay time of the transformer substation outgoing breaker, the section breaker and the branch circuit breaker, and performing controlling. Compared with the prior art, the on-site coinciding type fault isolation method and system can reduce the tripping frequency of the transformer substation outgoing breaker and further shorten the fault isolation time and the power supply recovery time of a non-fault region.

The invention provides a feeder automation simulation training system. The system comprises a distribution main station, an EPON communication network, distribution terminals, and a feeder rack etc., the distribution main station is provided with a simulation system microcomputer, the simulation system microcomputer is provided with a simulation system service terminal software and a distribution SCADA, the simulation system service terminal software comprises a feeder fault simulation software and a two-dimensional virtual feeder test module, and the two-dimensional virtual feeder test module comprises a virtual operation learning module and a feeder operation test module. According to the system, the intensification of assemblies of a distribution automation system with disperse geographical areas is realized, low voltage of the primary rack is realized, the structure is concise and clear, the debugging, tests, and training of automation modes of various feeders can be performed, the training and examination modes of automation operation maintenance operation are optimized, the danger in the processes of operation, testing, and examination is reduced, and the pertinence of the distribution automation engineering training is improved.

The invention relates to an automatic power distribution network single line diagram drawing method based on an improved gravitation repulsion model and belongs to the technical field of electric power system dispatching automation. According to the method, firstly, all devices and connection relations which belong to one feeder line are read from a power grid public information model; all the read devices are abstracted into nodes, the connection relations between the devices are abstracted into lines, and a foundation network structure chart is completed; then, the device nodes are replaced with 8-node rectangular frames, and layout adjustment is performed on the structure chart by using the improved gravitation repulsion model; a final layout is generated through orthogonalization, intersection removal and connecting line contraction; finally, information including node positions, device types, device names and electrical attributes of the devices in the final layout are output to a single line diagram file, device diagrams replace the 8-node rectangular frames, and drawing of a power distribution network single line diagram is completed. The single line diagram drawn with the method has attractive and compact layout and lines do not intersect and overlap.

The invention provides an isophase differential beam forming device. The isophase differential beam forming device comprises a first metal reflection board, a second metal reflection board, insulation dielectric slices, a sliding device, a dielectric substrate and feeder line networks, wherein the feeder line networks are etched on the dielectric substrate; the dielectric substrate and the insulation dielectric slices are clamped between the first metal reflection board and the second metal reflection board; the sliding device is connected with the insulation dielectric slice and is used for driving multiple insulation dielectric slices to synchronously move; and the insulation dielectric slices are only overlapped with fixed transmission lines in the feeder line networks during a moving process. The isophase differential beam forming device disclosed by the invention is not overlapped with a power distribution sub unit during the moving process, and redundant consumption of the feeder line networks due to the insulation dielectric slices is prevented; and meanwhile, due to the design that an integrated large-scale insulation body is replaced by multiple small-scale insulation dielectric slices, not only is the problem that an insulation body is easy to bend and deform solved, but also the manufacturing cost of the isophase differential beam forming device is reduced.

The invention discloses a feeder line disconnection power outage range identifying system and method based on distribution transformer terminal information. The system comprises a measurement automation system, a grid distribution power outage range analyzing host (22) and a grid distribution scheduling management system (23), wherein the measurement automation system comprises a distribution transformer terminal (211) and a measurement automation system master station (212). The feeder line disconnection power outage range identifying system and method based on the distribution transformer terminal information has the advantages of saving a large number of grid distribution terminals and reducing cost. Meanwhile, the feeder line disconnection power outage range identifying system based on the distribution transformer terminal information can automatically judge the grid distribution power outage range affected by feeder line disconnection through identification characteristics, can save identification via artificial experience and accordingly can rapidly inform maintenance personnel for repair.

The invention relates to a system for realizing mobile communication multiple input multiple output (MIMO) indoor coverage by a single feeder, which consists of near-end units and remote-end units, wherein one near-end unit can be matched with a plurality of remote-end units, and the near-end units and the remote-end units are connected through the single feeder. The system uses one single feeder for transmitting MIMO signals, the problem of coverage occasion of installation limitation of a plurality of feeders in a MIMO system can be solved, and a new system solution is provided for the MIMO indoor coverage.

The invention discloses a four way filtering-type power divider based on three-line coupling structures, which relates to a microwave passive device. Five input and output feeder lines are composed of microstrip lines; the microstrip lines are serially connected with a step impedance structure, two vertically-symmetrical branches are divided, and each branch is composed of a three-line coupling structure, a metallized through hole grounding structure, a bent microstrip line, a two-way power dividing structure, an isolation resistor connected between the two three-line coupling structures and two isolation resistors connected in the two-way power dividing structure; the step impedance structure comprises two rectangular microstrip lines with different characteristic impedance serially connected in the circuit; the three-line coupling structure comprises three microstrip lines with the same width; the three microstrip lines are mutually parallel with the same gaps; the tail end of the middle microstrip line in the three-line coupling structure is connected with the metallized through hole grounding structure; the bent microstrip line is connected at one end of the three-line coupling structure; and the two-way power dividing structure comprises two branch microstrip lines in parallel connection onto the bent microstrip line and an isolation resistor connected between the tail ends of the two microstrip lines.

The invention relates to an optical fiber communication network failure monitoring technology, in particular to a device and a method for monitoring failures of a time division multiplexing optical network link, and solves the problems that the present time division multiplexing passive optical network failure monitoring technology is low in spatial resolution, complicated in structure, low in sensitivity and small in dynamic range. The device comprises a time division multiplexing optical network and a monitoring device, wherein the time division multiplexing optical network comprises an optical line terminal, a feeder fiber, an n-branch optical splitter, n branch fibers and n optical network units; the monitoring device comprises an isolator-free semiconductor laser, a coupler, an optical coupling device, a photoelectric detector, a signal acquisition and treatment device and n optical feedback devices. The semiconductor laser is connected with the coupler, and the large-scale output terminal of the coupler is connected with the input terminal of the optical coupling device. The device is suitable for monitoring failures of a time division multiplexing passive optical network.

Provided are an apparatus and method for load-balancing of a three-phase electric power distribution system having a multi-phase feeder, including obtaining topology information of the feeder identifying supply points for customer loads and feeder sections between the supply points, obtaining customer information that includes peak customer load at each of the points between each of the feeder sections, performing a phase balancing analysis, and recommending phase assignment at the customer load supply points.

Embodiments provide ground-based beamforming with mutually synchronized spatially multiplexed gateways in a wireless communications system. Some embodiments operate in context of a satellite having a focused-beam feeder antenna that communicates with multiple, geographically distributed gateway terminals (e.g., single gateway per beam), and a user antenna that provides communications with user terminals via formed user beams. The gateway terminals can communicate feeder signals that are beam-weighted and mutually phase-synchronized (e.g., according to satellite and/or loopback beacons). For example, the synchronization can enable forward uplink signals to be phase-synchronously received by the satellite, and the beam weighting can enable the forward downlink signals to spatially combine to form forward user beams. Embodiments can achieve extensive bandwidth reuse through mutually synchronized spatial multiplexing of the feeder-link communications.

The invention relates to a logic operation-based distributed feeder automatization fault judgment method. The method is characterized in that in combination with the features of a power distribution network, an open-loop operating mode and a closed-loop operating mode of the network adopt a unified fault judgment rule, so as to avoid parameter adjustment due to the changing of operating modes. Through a fixed wire connection manner, the direction of the flow passing through a switch is set, and the flow and fault current passing through the switch are converted into unified analog quantity, and the control state of the switch can be obtained according to the logic operation of adjacent switch groups. A voltage-loss reclosing function on one side of the switch is added, so as to effectively avoid the influence on a grid, which is caused by transient fault. The method is concise, convenient and strong in adaptability, and can meet the actual requirement of feeder automatization.