1816 results about "Feeder line" patented technology

In conjunction with a data communication network (53) carrying multiple telephony signals and allowing for connection of telephone sets (17), a system and method in which two external feeders (55a, 55b) connect to the data network (53) at two distinct points via two distinct devices. The data network can be based on dedicated wiring or can use existing in premises medium such as telephone, powerlines or CATV wiring. In the latter case, the wiring can still carry the original service for which it was installed. The external telephone connections can be based on the traditional PSTN, CATV network, cellular telephone network or any other telephone service provider network, using specific adapter for any medium used. In the case of connection to a POTS telephone signal, VoIP gateway (or any other converter) is required.

A plurality of end-user locations are served by a commercial utility grid. More than one and less than all of the end-user locations are themselves interconnected by a feeder, the feeder not metallically connected to the utility grid. The end-user locations each have a local AC bus that is not metallically connected to the utility grid or to the feeder, but that is linked by a coupler to both the utility grid and to the feeder. None of the local AC buses or the feeder is required to have the same phase or frequency as the utility grid. Locally generated electric power may be passed by means of the feeder to other end-user locations that are on the feeder. Each local AC bus has two or more inverters powering the bus.

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.

A tamper detection arrangement in a meter having a service disconnect switch employs a voltage sense circuit that requires only a single connection to digital processing circuitry for the feeder lines of typical residential service. In one embodiment, the voltage sense circuit includes an isolation device that electrically isolates the processing device from the line voltages. The voltage sense circuit senses a voltage on the feeder lines and is operable to generate a voltage detection signal having a characteristic representative of whether line voltage from the electrical power lines is present on the feeder lines. A processing circuit is operably connected to the voltage sense circuit to receive the voltage detection signal and to selectively generate a tamper flag based on whether the characteristic of the voltage detection signal indicates the presence of voltage on the first and second feeder lines when the service disconnect switch has disconnected the electrical power lines from the first and second feeder lines.

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 wavelength-division multiplexed self-healing passive optical network is capable of detecting cut-off and deterioration of feeder fiber and distribution fiber and restoring a network with a star structure. The network includes a central office, a remote node, and a plurality of subscriber units. Working and protection feeder fibers connect the central office to the remote node. A reflection unit at an end of the remote node connects to the central office for reflecting a monitoring optical signal transmitted from the central office. An output monitor stage at an end of the central office connects to the remote node for detecting the reflected monitoring optical signal and generating a control signal based on the presence of abnormality of the working and protection feeder fibers.

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.

Locating a fault of an optical transmission line in a system which performs bidirectional optical communication between a wire center Optical Line Terminal (OLT) and plural subscriber devices, Optical Network Terminal (ONT). In this ITU defined topology, a feeder extending from the OLT is branched by a passive (non powered) splitter / coupler device into plural legs each connected to the ONT devices. The present invention encompasses a novel test apparatus and technique for fault location on Passive Optical Networks (PON) and / or Fiber of the premise Networks (FTTP), encompassing APON, BPON and EPON allowing non-service interruptive test, without damage to the ONT or OLT transceivers. The invention provides service providers the ability to locate a fault occurring on an optical transmission line while the system is actively performing bidirectional optical communication between a OLT / head-end device and plurality of ONT / subscriber devices.

A cable breakout assembly is provided, including a feeder cable, a breakout structure having a first end threadedly engaged with a cable nut having a single-port cable gland through which the feeder cable extends, a central conduit which houses the sections of the feeder cable passing there through, and an opposed second end threadedly engaged with a cable nut having a multi-port cable gland, whose number of ports corresponds to the number of splices of the feeder cable. A plurality of environmentally sealed, flexible conduits are provided, each having a first end that interfaces with and extends from a respective port of the multi-port gland, and a second end adapted to interface with an external device, wherein each flexible conduit houses a respective spliced section of the feeder cable therein.

The invention discloses a flexible grounding device single-phase grounding fault line selection and arc extinguishing method for a power distribution network. The method mainly comprises the steps: employing a virtual resistor control mode when a single-phase grounding fault happens to the power distribution network, controlling a flexible grounding device to inject a resistive current with the controllable amplitude value into a neutral point, enabling a system to operate in a small-resistance grounding mode, and judging a fault feed line through the measurement and comparison of the zero sequence currents of all feed lines, and giving the feedback to a relay protection device; employing a virtual inductance control method, controlling the flexible grounding device to inject an arc-extinguishing compensation current into the neutral point, enabling the system to operate in a resonant grounding mode, and achieving a purpose of single-phase grounding fault arc extinguishing. Through the switching of control modes, the method can solve problems that a resonant grounding system cannot accurately judge the fault feed line, a small-resistance grounding system is high in fault trip-out rate and a fault of a conventional flexible grounding device control method is difficult to detect during high-resistance grounding. The method can reduce the maloperation rate of protection, improves the fault arc extinguishing success rate, and improves the power supply reliability of the power distribution network.

The invention relates to a power distribution network fault circuit selection method based on transient zero-sequence current time-frequency characteristic vectors, and belongs to the technical field of power system relay protection. When a power distribution network runs into a single-phase earth fault via an arc suppression coil grounding system, a transient zero-sequence current component detected by a measuring end is a nonlinear non-stationary signal formed by different frequency components. By taking the fault component as a study object, time-frequency characteristics of a fault transient current of the fault component are analyzed by utilizing the wavelet packet theory, time-frequency distribution regularities among all feeder lines under different fault conditions are described according to similarity of the time-frequency characteristics, and consequently line selection criteria based on transient zero-sequence current time-frequency characteristics can be obtained. The method is simple in principle, only utilizes short-time window zero-sequence current data of 5ms after the fault, can identify faulty feeders under the conditions of small fault angle and high resistance ground fault, has excellent timeliness and robustness, is free from influence of an arc fault or a resistance ground fault, requires a low sampling rate for hardware, and is highly practical.

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.

The invention discloses a method for improving radiation performance of an antenna. A mobile terminal is provided with a conducting piece; the conducting piece on the mobile terminal is used as a feeder line of the antenna of the mobile terminal; the conducting piece is used as a feeder line of the antenna of the mobile terminal; and the length of the feeder line is more than 90mm. The invention discloses the mobile terminal simultaneously; a mobile terminal body is provided with the conducting piece which is used as the feeder line of the mobile terminal antenna, and the length of the feeder line is more than 90mm; and the feeder line is respectively connected with a feeding point or a feeding lead of the mobile terminal antenna and an earthing point or an earthing lead of the mobile terminal antenna. In the invention, a metal piece arranged a mobile terminal machine body can not cause any influence to the antenna of the mobile terminal, and ensure the radiation performance of the antenna of the mobile terminal. The technical scheme of the invention is simple and practical.

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.

A fiber optic network for a multiple dwelling unit (MDU) is disclosed. The fiber optic network comprises a riser cable preconnectorized with a first riser optical connector. The riser cable is optically connected to a feeder cable providing optical communication service to the MDU. The riser cable has one or more preset mid-span access points along the length of the riser cable. One or more optical fibers of the riser cable extend from the riser cable at the one or more preset mid-span access points and are preconnectorized with a second riser optical connector. A payout reel is adapted to pay out the riser cable such that the riser cable extends between the lower level and at least one of the one or more distribution levels. The payout reel is adapted to store a length of the riser.

The invention provides a radiation net fault location method by means of a zero mode and aerial mode time difference independent of double-end synchronization and with matching of the magnitude of voltages and the magnitude of currents, and belongs to the technical field of power system relay protection. The two sides of a feeder are respectively provided with a traveling wave fault location device, and fault location is carried out according to information on the two sides. After a ground fault of the feeder of a power distribution net occurs, due to sudden changes of the voltage at a fault point, an aerial mode traveling wave component spreading between wires and a zero mode traveling wave component spreading between the wires and the ground are generated. Due to the fact that the spreading speeds of an aerial mode and a zero mode are different, the arrival moment of an aerial mode traveling wave detected by the measurement end and the arrival moment of a zero mode traveling wave detected by the measurement end are different. According to original aerial mode voltage and current traveling wave data and original zero mode voltage and current traveling wave data detected by the measurement end, wave arrival moment calibration is carried out by means of a wavelet modulus maximum value under a fifth dimension, and then the fault position is calculated according to a calculation formula of a ground fault single-end traveling wave fault location method of modulus transmission time differences. Fault location is carried out according to measurement information of the single-end modulus transmission time differences at two sides.

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 a single-phase earth fault direction judgment and processing method of a small current grounding system. In terms of a fault direction judgment method, the session which a single-phase fault point belongs to on a main line is judged according to zero-sequence currents, zero-sequence voltage and the included angle relation between the zero-sequence currents and the zero-sequence voltage tested through a section switch on the main line where a single-phase earth fault occurs, the fault session is isolated according to the judgment result, and normal power supply of a non-fault session line is guaranteed to the largest extent. According to the judgment and processing method, the single-phase earth fault session of the main line can be automatically isolated, and power supply reliability of a power distribution network is improved; additionally, according to the single-phase grounding direction judgment method, a main line boundary function is embedded in the section switch of a 10kV feeder line, the range in power failure caused by the single-phase earth fault can be shortened to the largest extent, and accordingly reliability and safety of power supply are improved.

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.

An apparatus and method are provided for controlling a wireless feeder network which connects access base stations to a communications network. The wireless feeder network comprises a plurality of feeder base stations connected to the communications network and a plurality of feeder terminals connected to the plurality of access base stations. A sounding schedule is determined for the wireless feeder network in dependence on a visibility matrix, the visibility matrix indicative of visibility via the wireless feeder network between each of the plurality of feeder base stations and each of the plurality of feeder terminals. Then a sounding procedure within the wireless feeder network is controlled in accordance with the sounding schedule. The visibility matrix enables a coordinated sounding procedure to be carried out, allowing more accurate channel metrics for the wireless channels of the network to be determined which are not adversely affected by interference between elements of the network.

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 provides a grounding detection device for a power distribution system and a fault detection method thereof, and aims to solve the problem that the detection operation is not easy and convenient, and the problem that the conventional detection device is not suitable to be used for various power systems existing in the conventional detection device. The device consists of a signal acquisition treatment display device used for acquiring and treating zero sequence current of a feeder line to be detected and a power circuit, wherein the signal acquisition treatment display device comprises n groups of acquisition treatment display devices with the same structure for detecting the signals of the detected zero sequence current in n different measuring ranges respectively; and the power circuit may adopt a mains supply or a battery supply. The method comprises the following steps of: estimating the zero sequence current of the system; measuring the zero sequence current of the feeder line by using the grounding detection device for the power distribution system; and determining and troubleshooting the fault line. By using the device, an operator can quickly, safely and accurately detect the feeder line having the grounding fault in a short time, and the device is suitable to be used for various power systems.

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.