The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Zhinong Wei - One of the best experts on this subject based on the ideXlab platform.

  • transmission line distance protection under Current Transformer saturation
    Journal of Modern Power Systems and Clean Energy, 2021
    Co-Authors: Yuping Zheng, Feng Hong, Gang Yao, Jimin Chai, Zhinong Wei
    Abstract:

    Conventional transmission line distance protection approaches are subject to malfunction under reverse fault-induced Current Transformer (CT) saturation for the typically employed breaker-and-a-half configuration. This paper addresses this issue by proposing a new distance protection approach that combines the blocking and unblocking criteria of distance protection based on the values of incomplete differential Current, operation voltage, and Current harmonic content. The proposed approach is verified by theoretical analysis, dynamic simulation testing, and field operation to ensure that the obtained distance protection is reliable and refrains from operating unnecessarily under reverse fault-induced CT saturation in the breaker-and-a-half configuration. Meanwhile, the proposed approach is demonstrated can operate reliably when forward faults occur or various reverse faults are converted to forward faults.

Xiang Dawei - One of the best experts on this subject based on the ideXlab platform.

  • Current Transformer igbt power module field double pulse testing system and method
    2016
    Co-Authors: Xiang Dawei, Liu Yeke, Yuan Yichao
    Abstract:

    The present invention relates to a Current Transformer IGBT power module field double-pulse testing system and a method. The testing system comprises a double-pulse testing circuit which comprises a double-pulse testing circuit which comprises an input power supply (1), a Current Transformer and a load which are connected in order, a detection unit which is used for detecting the relevant parameters of each IGBT in the IGBT power module (3) in the Current Transformer, a data acquisition unit which is connected to the detection unit and is used for collecting the measured relevant parameters of the IGBT, and a data processing unit which is connected to the data acquisition unit and is used for carrying out analyzing processing on the measured relevant parameters of the IGBT. The testing method comprises the steps of (1) constructing a double-pulse testing circuit, (2) carrying out data measurement to measure the switch parameter of each IGBT in the IGBT power module (3) in the Current Transformer, and (3) carrying out data processing to carrying out analyzing processing on the measured switch parameter of the IGBT. Compared with the prior art, the system and the method have the advantages of accurate measurement and convenient measurement and are suitable for field measurement.

  • harmonic monitoring based Current Transformer power module on line fault diagnosis method
    2013
    Co-Authors: Xiang Dawei
    Abstract:

    The invention relates to a harmonic monitoring-based Current Transformer power module on-line fault diagnosis method comprising the following steps: 1) selecting one or more typical operation work points of a Current Transformer as fault diagnosis work points; 2) acquiring the harmonic initial characteristic of the Current Transformer and taking the harmonic initial characteristic as the standard of fault diagnosis; 3) monitoring and acquiring a voltage or Current signal output by a Current Transformer power module in the operation process of the Current Transformer to acquire a low-order harmonic signal of voltage or Current, and acquiring a surface shell temperature signal of the power module to acquire the Current harmonic characteristic; and 4) comparing the harmonic initial characteristic of the Current Transformer with the Current harmonic characteristic, calculating the Current health state index of a Transformer, judging whether a fault exists or not according to the health state index, judging the fault type according to the Current harmonic change characteristic, and sending out an alarm signal and shutting down when the health state index reaches the set fault limiting value. Compared with the prior art, the method is simple to realize, low in cost and accurate and effective in fault diagnosis result.

Tian Tian - One of the best experts on this subject based on the ideXlab platform.

  • design and experimental study of a Current Transformer with a stacked pcb based on b dot
    Sensors, 2017
    Co-Authors: Jingang Wang, Diancheng Si, Tian Tian
    Abstract:

    An electronic Current Transformer with a B-dot sensor is proposed in this study. The B-dot sensor can realize the Current measurement of the transmission line in a non-contact way in accordance with the principle of magnetic field coupling. The multiple electrodes series-opposing structure is applied together with differential input structures and active integrating circuits, which can allow the sensor to operate in differential mode. Maxwell software is adopted to model and simulate the sensor. Optimization of the sensor structural parameters is conducted through finite-element simulation. A test platform is built to conduct the steady-state characteristic, on-off operation, and linearity tests for the designed Current Transformer under the power-frequency Current. As shown by the test results, in contrast with traditional electromagnetic CT, the designed Current Transformer can achieve high accuracy and good phase-frequency; its linearity is also very good at different distances from the wire. The proposed Current Transformer provides a new method for electricity larceny prevention and on-line monitoring of the power grid in an electric system, thereby satisfying the development demands of the smart power grid.

Miaoyuan Ye - One of the best experts on this subject based on the ideXlab platform.

  • single core differential Current Transformer power supply
    2011
    Co-Authors: Xia Xiao, Ken Xu, Mingjun Zhu, Yan Xu, Miaoyuan Ye
    Abstract:

    The invention discloses a single-core differential Current Transformer power supply. The main body of the power supply is two groups of coils wound on an annular energy acquiring iron core; two groupsof coils are in differential connection; two AC input ends of a bridge rectifier circuit are respectively connected with two output ends of the differential coils and output ends are connected to a filter circuit; a positive output end of the filter circuit is connected to a positive input end of a voltage regulator circuit; a positive output end of the voltage regulator circuit is connected to aelectrolytic capacitor; positive and negative poles of the electrolytic capacitor are respectively used as positive and negative output ends of the power supply. Compared with traditional Current Transformer power supply with single coil, the differential Current and voltage output by the differential coil is smaller at the same primary Current excitation, so that the differential Current Transformer power supply can work at tremendous primary Current and the power supply uses one annular energy acquiring iron core, the volume is smaller than that of the double-core differential Current Transformer power supply; the use is convenient; the differential Current Transformer power supply is mainly used for supplying electrical energy for high voltage side of electronic Transformer.

Xie Zheng - One of the best experts on this subject based on the ideXlab platform.

  • motor train unit auxiliary Current Transformer interconnected line parallel power supply control system
    2014
    Co-Authors: Yang Dongjun, Wei Junlei, Li Zhaoping, Zhang Lijun, Zhang Xiaoming, Xie Zheng, Zhang Bo, Li Bo, Zhou Yang, Zhang Yanfang
    Abstract:

    The utility model relates to a motor train unit auxiliary Current Transformer interconnected line parallel power supply control system. The motor train unit auxiliary Current Transformer interconnected line parallel power supply control system comprises a plurality of three-phase inverter modules which are in parallel connection. The motor train unit auxiliary Current Transformer interconnected line parallel power supply control system is characterized in that any two phases of circuits of any one three-phase inverter module is connected in parallel with corresponding two phases of circuits of a three-phase inverter adjacent to the three-phase inverter module through a connection line module; the connection line modules are connected with a control system; and each three-phase inverter module is also connected with the control system. According to the motor train unit auxiliary Current Transformer interconnected line parallel power supply control system of the utility model, fewer interconnected lines are adopted; any two phases in each three-phase inverter module are connected in parallel with corresponding two phases of each of the other three-phase inverter modules respectively; Current between any two phases of each three-phases circuit is balanced; and therefore, stable power supply can be realized, and the reliability of the system can be greatly improved.

  • vehicle mounted Current Transformer power module
    2014
    Co-Authors: Li Bo, Zhang Shouchun, Lin Xiangli, Yang Dongjun, Wei Junlei, Zhang Lijun, Zhang Xiaoming, Zhang Bo, Zhou Yang, Xie Zheng
    Abstract:

    The utility model relates to the technical field of auxiliary Current Transformers for railway vehicles and specifically relates to a vehicle-mounted Current Transformer power module for a railway vehicle. The vehicle-mounted Current Transformer power module comprises a power circuit, a drive circuit, a power supply module, a heat dissipater, a support capacitor C1, a busbar, and a mechanical shell, wherein the power circuit is a three-phase inversion full-bridge circuit; the busbar is a lamination busbar and is a structure having two sides bended downwards; and one side of the busbar is electrically connected with the capacitor C1, while the other side of the busbar is electrically with wiring terminals. The power module of the utility model is advantaged in that the lamination busbar can effectively reduce the loop voltage reduction and heating loss. The Current Transformer power module is compact in overall structural arrangement, reasonable in layout of various components, and simple and convenient in assembling and disassembling process.