44results about "Fault location" patented technology

Systems and methods are disclosed for detecting balanced electrical leakage between a power source and a machine frame. In one embodiment, a balanced fault detection system for a machine includes a power source that is electrically insulated from a machine frame and a leakage detection switch that is connected to a ground. The balanced fault detection system also includes a leakage detection resistor that is interposed between a power source terminal and the switch having a leakage detection resistance. The balanced fault detection system further includes a voltage measuring device that measures voltages of the power source at positive and negative voltage sides of the ground and a leakage calculator that calculates a leakage resistance of the machine based on the measured voltages at the positive and negative voltage sides and the leakage detection resistance.

A distributed LSR sends data from a first edge LSR, across a non-MPLS network, to a second edge LSR, thereby enabling a non-MPLS network to interface transparently with MPLS networks. This enables a VPN to use a public network to communicate from one portion of the network to another, remote portion. The distributed LSR includes an ingress gateway logically positioned between the first edge LSR and the non-MPLS network. This ingress gateway receives label requests from the first edge LSR. These label requests are multicast to several egress gateways. At least one egress gateway sends a message back indicating that it can transmit data to the destination. In response, the ingress gateway designates that egress gateway to be a designated gateway. The egress gateway then establishes a tunnel through the non-MPLS network to the ingress gateway.

The invention provides a fault phase selection method of double transmission line protection on the same pole, comprising the steps that (1) a low voltage phase component criterion Uphi<Uset selects the fault phase firstly, in the formula, Uphi is any one voltage value of the three phases A, B and C, and the Uset is a set voltage threshold constant value; (2) the criterion FORMULA based on fault component direction distinguishes the fault type, among the formula, Delta Uphi and Delta Iphi are the fault component voltage and current of the fault phase selected by the low voltage phase selection component, and Theta phi is the phase angle difference of them; when step (1) and step (2) are fulfilled at the same time, the fault phase Phi is judged to be an internal fault phase, then the protection is implemented, if only the step (1) is fulfilled, the fault phase Phi is judged to be an external fault, then protection is not actuated.

A passive optical network (PON) including an optical line termination (OLT) and a plurality of optical network units (ONUs) which are connected. The optical line termination includes a band setting control section; an upstream control cell receiving section; a use right transmitting section; and a downstream control cell transmitting section. Each of the plurality of optical network units includes a downstream control cell receiving section; a use right acquisition determining section; and an upstream control cell transmitting section.

The present invention discloses a Discontinuous Reception (DRX) parameter configuration method for facilitating Automatic Neighbor Relation (ANR) measurement. The method comprises determining a traffic intensity of a User Equipment (UE) by which a DRX-based ANR measurement is to be performed. The method further comprises setting a value for a DRX parameter to be used by the UE to perform the DRX-based ANR measurement, in accordance with the determined traffic intensity of the UE. The method further comprises transmitting the value set for the DRX parameter to the UE. The present invention further provides an associated BS adapted to perform DRX parameter configuration to facilitate ANR measurement.

The present invention relates to a method and apparatus for determining radio link failure between the UE and the eNB in a wireless communication system. Particularly, the present invention provides a method and apparatus for determining radio link failure efficiently in such a way that the UE measures the radio link quality of the anchor carrier, the radio link qualities of the aggregated carriers, and the radio link quality of neighbor cells in order, and determines whether the radio link quality fulfills a predetermined condition.

A session identification unit (11) determines a session to which an incoming packet belongs, while a session relay unit (12-1-12-N) relays between a session with a transmission terminal and a session with a reception terminal. A packet scheduler (13) instructs and controls the delivery of packets from each session relay unit (12-1-12-N), and a delivery control unit (14) delivers packets from each session relay unit (12-1-12-N) based on the instruction. In the session relay unit (12-1), a transmission session processing unit (121-1) processes a session for transmitting data to the reception terminal, and a transmission buffer (122-1) stores received data until the end of a transmission. A reception session processing unit (123-1) processes a session for receiving data from the transmission terminal.

The present invention discloses a method and a device for transmitting data. According to the technical solution provided by the present invention, no actual end-to-end multi-bearer connection is established between a terminal and a network side, but the terminal, when locally transmitting a data packet, simulates a multi-bearer mechanism to establish multiple virtual service channels on a bearer and performs priority-based scheduling between the service channels. Through virtual multi-bearer, the present invention can balance service QoS with resource utilization under the condition that the network or the terminal does not support the multi-bearer capability or the multi-bearer capability is restricted.

Disclosed is a demultiplexer for demultiplexing a multiplexed stream, obtained on time division multiplexing a plurality of elementary streams. A buffer controller, forming this demultiplexer, writes a multiplexed stream, beginning from a location specified by a data write pointer of a ring buffer, configured for storing data of the multiplexed stream, in the manner of an endless loop. On receipt of an ES1 readout request, an ES1 readout control unit takes out, from an ES1 readout pointer storage unit, a readout pointer, as a start point of retrieving an area in the ring buffer where the oldest ES1 is stored. The ES1 readout control unit then retrieves and reads out the ES1, with a location specified by the ES1 readout pointer, as a start point, and sends the ES1, thus read out, to the source of the request. The ES1 readout control unit then updates the ES1 readout pointer and the data leading end pointer.

A method of transmitting voice frames, via a transmission channel reserved for voice data, by a transmitting terminal generating voice frames using a voice signal is proposed. Such a method includes steps of: obtaining non-voice data; selecting voice data from the voice frame according to configuration data obtained beforehand relative to the transmission of non-voice data on the reserved channel; constructing of a degraded voice frame by replacing selected voice data with non-voice data; transmitting the degraded voice frame via the reserved channel to a receiving terminal. On the receiving terminal side, a method of managing voice frames coming from the transmitting terminal is proposed including the steps of: detecting a non-voice data header included in the voice frame; extracting, from the voice frame, of non-voice data, according to configuration data read in the header; transmitting of extracted non-voice data to a processor of non-voice data.

The invention discloses a wire single-phase earth fault single-end ranging method using a ranging scale minimum principle. The method includes: measuring fault-phase voltage, fault-phase current and fault-phase negative-sequence current and zero-sequence current at a transmission line protecting mounting position; selecting initial fault distance as 1x which is increased gradually by a step length delta 1, sequentially calculating ranging scale e (1x) of each point in the whole transmission line, and selecting the distance from the point with the smallest ranging scale e(1x) to the transmission line protecting mounting position as fault distance. Physical features of transmission line voltage and current transmission are described through distribution parameters, ranging precision is unaffected by transmission line ground capacitors, and the method is applicable to single-phase earth fault single-end ranging of transmission lines of optional voltage grades, especially applicable to single-phase earth fault single-end ranging for transmission lines with ultrahigh voltage.

The invention discloses a calculation method for theoretical line loss of a distribution network considering a small power supply. The calculation method comprises the following steps of: obtaining aresistance of each branch of the distribution network, the active power, a reactive power, a voltage and current data of each node; counting a power consumption of each small power node, using an average current method to calculate the power loss of the distribution network; calculating injection current of each node according to the active power, the reactive power, a voltage amplitude and a current amplitude of each node; forming a path mutual resistance matrix by using a search method; obtaining an accurate electric energy loss calculation model, and a loss calculation model based on the average current method by adopting a loop analysis method based on the path mutual resistance matrix and the injection current of each node; using the accurate power loss calculation model, and the losscalculation model based on the average current method to obtain a calculation error of the average current method, that is, a correction amount of loss; and calculating the sum of the power loss obtained by the average current method and the correction amount of the loss, and obtaining the theoretical power loss of the distribution network.

A master-slave communication system for a communication switch is provided. The system comprises a master controller generating commands and receiving status signals and slave devices associated with the master controller. Each slave receives commands, executes local commands responsive to the commands and generates status signals for the master controller. Each slave has a communication arrangement for signals transmitted between it and the master controller. The arrangement comprises a communication controller associated with the master controller. The communication controller receives commands, transmits commands to each slave, receives status signals and provides information relating to the status signals to the master controller; also the controller has a communication link which transmits commands to each slave and the status signals to the controller. The system allows local commands executed by the slaves to replace other commands directed by the master controller to the slave. Further, each slave communicates independently with the master controller.

The invention relates to a fault diagnosis method and device for transformer station grounding network. The method comprises the following steps of: 1, selecting a grounding state parameter test pointof a specific grounding down lead of the transformer station grounding network; 2, connecting a field arbitrary wave current signal combination generator, selecting a representative grounding down lead at a different location of the grounding network as a voltage response output terminal, and connecting the voltage response output terminal to a high-frequency data acquisition device; 3, obtainingthe frequency response process curves of the representative grounding down leads at different locations of the grounding network; 4, subjecting the curves to the combined correlation coefficient analysis; and 5, evaluating the running status of the grounding network according to a result of the combined correlation coefficient analysis. Compared with the prior art, the fault diagnosis method hasthe advantages of ensuring the safe and reliable operation of a power system, being simple, accurate, and not limited by field operating conditions.

Information about an attribute of packets that are receivable corresponding to a command is registered. When a packet is received, information about an attribute of the packet received is acquired. Upon occurrence of a reception error that there is no information in the attribute registering unit corresponding to the information acquired by the attribute acquiring unit, a predetermined reception error handling routine is executed according to a type of the reception error.

The invention discloses a single-phase earth fault locating method of a power distribution network. The method comprises the following steps that (1) power distribution network fault indicators are mounted on all nodes and branches of the power distribution network, and three power distribution network fault indicators which are located on the same circuit and different in phase are used for comparing three-phase transient current information in real time to judge if faults happen; (2) fault information of all circuits is sent to a monitoring center to judge fault places. The method is simple and can be used for quickly judging fault positions.

Methods, systems, and devices are described for wireless communication at a UE. A user equipment (UE) may establish a connection to a serving cell and monitor channel conditions for the serving cell and neighboring cells. Based on the channel conditions, the UE may determine to read the system information of a non-serving neighbor. The UE may then read the system information of the non-serving neighbor cell while still connected to the serving cell. In some cases, the UE may store the system information in a database. When the time comes for the UE to access the neighbor cell (e.g., if the link to the serving cell fails) the UE may proceed with access procedures without delay using the stored system information.

A GPS synchronous timing-based XLPE cable partial discharge positioning device is provided. The GPS synchronous timing-based XLPE cable partial discharge positioning device includes a first high-frequency sensor, a second high-frequency sensor, an XLPE cable partial discharge detection positioning host, an XLPE cable partial discharge detection positioning slave and an upper computer. According to the GPS synchronous timing-based XLPE cable partial discharge positioning device of the invention, a single positioning device is divided into two sets of apparatuses which respectively detect high-frequency current signals of cable connector grounding lines at two ends of one XLPE cable, wherein one apparatus is adopted as the detection host, and the other apparatus is adopted as the detection slave; and the host and slave can realize synchronous acquisition through GPS timing synchronization, and therefore, precise time difference of the same pulse can be obtained, and a partial discharge power source can be precisely positioned.

Disclosed is a device for detecting electric cable troubles. The device comprises an electromagnetic sensor for rounding electric cable to be detected, a driving source component, a signal processing and displaying unit, and a signal cable. The electromagnetic sensor comprises a group of wires stagger joint between a plug and a socket. The device can be used to detect broken fold in multi-fold core cable, cable insulation and grounding.

The present invention discloses a method for detecting a resonance point of a reduced-order generalized integrator based on a device for identifying relationship between a transmission line and a transformer. The method actively transmits a carrier signal with a specified frequency to a power grid through the device for identifying the relationship between the transmission line and the transformer. Firstly, voltage and current signals of the power grid at the access point of the device for identifying the relationship between the transmission line and the transformer are collected; secondly, according to the extracted voltage and current signal data, the harmonic voltage and harmonic current signals with the injection frequency are extracted by using the computational formula of the reduced-order generalized integrator; then, according to the cosine similarity formula, the cosine similarity coefficient of the extracted harmonic signals with the injection frequency are calculated; finally, the resonant frequency range is judged by the calculated similarity coefficient, and the range is further reduced after the above steps are repeated by changing the injection frequency. With the solution, the calculation amount is small, and the resonant frequency range of power grid can be detected in real time.

A method for protecting a label switched path is disclosed. The method includes: setting, in a record_route object node list, interface classification identifications in record_route objects corresponding to interfaces of resource reservation protocol nodes respectively, and delivering the list downstream; when a downstream resource reservation protocol node receives the record_route object node list from upstream, finding, by the downstream resource reservation protocol node, a record_route object node corresponding to a last outgoing interface of a nearest outgoing interface in the record_route object node list according to the interface classification identifications, and setting next next hop protection for a corresponding label switched path according to a protection identification of the record-route object node. A system and device for protecting a label switched path are also disclosed. With the invention, an RSVP node may implement NNHOP protection for an upstream LSP correctly.

The invention provides a low-current single-phase earth fault line selection and localization device. The device comprises a host, a bus PT and at least one set of sensors, wherein the bus PT is used for collecting bus three-phase voltages of a power distribution network system. Each of the sensors includes a bus outlet sensor, three branch sensors and a wireless sending unit; the bus outlet sensor and the three branch sensors are respectively connected with the wireless sending unit. The host comprises an operation control unit, an earth fault monitoring circuit, a wavelet signal emitter and a wireless receiving unit, wherein the earth fault monitoring circuit, the wavelet signal emitter and the wireless receiving unit are respectively connected with the operation control unit; the earth fault monitoring circuit is connected with the bus PT; the wavelet signal emitter is connected with a neutral point of the bus PT; and the operation control unit and the sensors carry out wireless communication. According to the invention, trouble of manually searching of a fault point along a line according to a previous method can be saved; and the device has advantages of accurate fault determination, high line selection accuracy and rapid fault localization.