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| 20110115308 | FEEDER AUTOMATION SYSTEM AND METHOD FOR OPERATING THE SAME - A feeder automation system and a method for operating the feeder automation system are disclosed. The feeder automation system comprises a first domain comprising a first slave station; a second domain comprising a second slave station; and a tie-switch provided between the first domain and the second domain. The first slave station is adapted to operate the tie-switch directly, and the second slave station is adapted to operate the tie-switch through the first slave station. When a fault occurs in the system, the first slave station and the second slave station cooperate with each other to perform fault detection, fault isolation, and fault restoration etc. without interacting with a master station. | 05-19-2011 |
| 20110148430 | METHOD AND APPARATUS FOR FAULT IDENTIFICATION IN A POWER TANSMISSION LINE - A method and apparatus for fault identification in a transmission line are provided. The method may include measuring at an end of the transmission line when the transmission line has a fault to obtain a measured signal g(t), comparing the measured signal g(t) with a predefined standard signal f(t), the predefined standard signal f(t) having beat frequency characteristic; and identifying that the fault is a transient fault if the measured signal g(t) matches the predefined standard signal f(t) according to a result of the comparison, or the fault is a permanent fault if the measured signal g(t) does not match the predefined standard signal f(t) according to the result of the comparison. | 06-23-2011 |
| 20110163614 | METHOD AND SYSTEM FOR REARRANGING SOUND CONDUCTORS IN PARALLEL LINES IN POWER TRANSMISSION - A method and a system for rearranging sound conductors included in parallel lines in power transmission are provided. The parallel lines include at least a first line (L | 07-07-2011 |
| 20110166720 | FAST POWER SWING UNBLOCKING METHOD AND APPARATUS FOR DISTANCE PROTECTION IN POWER SYSTEM - The present invention discloses a fast power swing unblocking method and apparatus for a distance protection in a power system, which is able to ensure fast phase-segregated tripping of distance protection for faults during a power swing (3-phase or 2-phase swing). The power swing unblocking method in a power system according to the present invention comprises calculating changing rates of impedances for all operating loops of the distance protection in the power system; and determining a fault loop based on the calculated changing rates. If there is a fault loop, a blocked distance zone for the fault loop is unblocked. Before calculating the changing rates, whether the power system is under a power swing is checked and a distance zone that might mal-operate under the power swing is blocked if it is checked that the power system is under the power swing. By applying this invention, the performance of the distance protection during power swings can be improved, and the distance protection can ensure faster and phase-segregated operation, which are very beneficial for the system reliability. | 07-07-2011 |
| 20110188159 | METHOD AND DEVICE FOR SUPERVISING SECONDARY CIRCUIT OF INSTRUMENT TRANSFORMER IN POWER SYSTEM - A method and a protection IED for supervising a secondary circuit of an instrument transformer in a power system are disclosed. The instrument transformer is connected to a power system component. The method includes: detecting, by a protection IED which is connected to the secondary circuit of the instrument transformer and protects the power system component, disturbances in a signal from the instrument transformer; and determining whether a failure occurs in the secondary circuit of the instrument transformer, according to both a disturbance detection result from the protection IED and another disturbance detection result from at least one of other protection IEDs. The other protection IEDs include protection IEDs which are connected to other secondary circuits of the instrument transformer or to secondary circuits of another instrument transformer connected to the power system component, and protection IEDs which are connected to other instrument transformers connected to other power system components connected to the same busbar as the power system component is connected to. The secondary circuit supervision solutions provide more reliable and sensitive performance and need very small amount of information to be collected. | 08-04-2011 |
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| 20080310531 | ROBUST CHANNEL ESTIMATION IN COMMUNICATION SYSTEMS - An apparatus for archiving robust channel estimation in a communication system includes a training sequence generator to generate a training sequence. A formatter inserts the training sequence to a frame. A transmitting module is employed to transmit the frame. The training sequence generator further includes a symbol generator to generate a plurality of training symbols satisfying a predetermined constraint such that the training symbols are insensitive to synchronization error and a training sequence forming unit that forms the training sequence from the training symbols generated by the training symbol generator. | 12-18-2008 |
| 20090037163 | Fast and Flexible Communication System Simulation - A simulation system for a communication system includes a user interface to receive user definition and system configuration parameters of a simulation configuration file that includes a plurality of data structures representing various functional modules of the simulated communication system. A model library is provided to store different implementation models corresponding to different communication standards for each of the functional modules. A parsing module accesses the model library according to the user definition and system configuration parameters to obtain the appropriate implementation model for each of the functional modules, and generates a simulated system program based on the selected implementation models such that the simulated system program is reconfigurable to different implementations and communication standards. A simulation engine runs the simulated system program to simulate the simulated communication system. A simulated system program generation system is also described. | 02-05-2009 |
| 20090190705 | System And Method For In-Phase/Quadrature-Phase (I/Q) Time Delay Measurement And Compensation - A system for determining a time delay between an in-phase signal component and a quadrature-phase signal component includes an in-phase signal start time determination module coupled to an in-phase delay module, the in-phase signal start time determination module and the in-phase delay module configured to receive an in-phase signal component of a received signal. The in-phase signal start time determination module is configured to receive a reference signal. The system also includes a quadrature-phase signal start time determination module coupled to a quadrature-phase delay module, the quadrature-phase signal start time determination module and the quadrature-phase delay module configured to receive a quadrature-phase signal component of a received signal. The quadrature-phase signal start time determination module is configured to receive a reference signal, wherein the in-phase delay module is configured to develop an in-phase delay signal and the quadrature-phase delay module is configured to develop a quadrature-phase delay signal. | 07-30-2009 |
| 20090196334 | System and Method for In-Phase/Quadrature-Phase (I/Q) Mismatch Measurement and Compensation - A system for determining in-phase and quadrature-phase mismatch in a multiple-input, multiple-output (MIMO) communication architecture includes at least one transmitter coupled to at least one receiver and an in-phase (I) signal, quadrature-phase (Q) signal mismatch element configured to receive I and Q signal components over at least one communication channel, the I/Q signal mismatch element also configured to provide a signal representing gain imbalance, a signal representing quadrature error and a signal representing I/Q offset. | 08-06-2009 |
| 20100063791 | System And Method For Channel Emulator Performance Measurement And Evaluation - A system and method for determining the performance of a channel emulator includes an input signal, at least one transmitter configured to receive the input signal, the at least one transmitter coupled to at least one receiver through the channel emulator, the at least one transmitter configured to transmit the input signal through the channel emulator, the at least one receiver configured to receive a faded receive signal. The system also comprises a signal processor configured to receive a processor signal and the faded receive signal, the signal processor configured to correlate the processor signal and the faded receive signal to develop a correlated signal that represents a channel impulse of the channel emulator. The channel impulse of the channel emulator is used to extract at least one channel coefficient that reflects the performance of the channel emulator. | 03-11-2010 |
