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The effect of hydroxypropyl-β-cyclodextrin (HPβCD) on the improvement of the solubility and fungicidal activity of carbendazim (MBC) has been investigated. The inclusion complexation of HPβCD with MBC has been prepared and characterized by phase solubility diagram, fluorescence, 1 H NMR, ROESY and FT-IR spectra. The stoichiometric ratio and stability constant were determined by Job's plot...
This paper designs and makes up a wireless monitoring and control system based on the wireless communication with several single chips and the nRF905 modules. Transferring data and instructions via wireless interface, the system can control the opening and closing operation of a high voltage circuit breaker and measure the characteristic parameters. The reliability tests on the system under a series...
This paper investigated a new type of operating mechanism in which the high voltage circuit breaker (HVCB) is driven by a permanent magnet synchronous motor (PMSM). This type of mechanism has high reliability due to its simple mechanical structure. In addition, the operating process of the mechanism is controllable. In this paper, the control technique of PMSM was introduced. A simulation model of...
This paper proposes an improved trajectory sensitivity method for transient stability constrained optimal power flow (TSCOPF) based on one-machine infinite bus (OMIB) equivalence after analyzing several problems existing in the trajectory sensitivity method for TSCOPF under multi-contingency condition, in which critical stable rotor angle is used as a threshold in stability constraint and the prediction-correction...
This paper designs and makes up a wireless monitoring and control system based on the wireless communication with several single chips and the nRF905 modules. Transferring data and instructions via wireless interface, the system can control the opening and closing operation of a high voltage circuit breaker and measure the characteristic parameters. The reliability tests on the system under a series...
In order to improve the operation reliability of high voltage circuit breaker (HVCB) and realize the full control ability in the opening and closing operating process, this paper studied a new type of motor drive operating mechanism. The control technique of the mechanism was introduced. A hardware system was designed, which consists of a HVCB, a converter, a PMSM and its control device based on DSP...
The vacuum degree of vacuum interrupter, the isolation contact and the surface insulation condition, when in bad status, are all possible causes of serious insulation or current carry failures to high voltage vacuum cubicle switchboard. A large series of experiments have been executed in this paper to verify the feasibility of using Ratio Frequency (RF) signal emitted by the partial discharge under...
Under the trend of substation automation, the application of wireless technology to the data communication of power equipments has a wide prospect. Bluetooth is a mature and low-cost wireless technique which is widely applied for commercial use, however its application to power equipments such as vacuum switches which are now more and more used in medium voltage substations, still needs to develop...
In this paper the typical interference sources for wireless communication in medium voltage (MV) switchgear are first studied and summarized, and the gap breakdown is then chosen as the primary interference source for IEEE 802.11b communication. The immunity tests to the interference of gap breakdown and narrow-band signals are carried out. The results show that both SF6 and vacuum gap breakdown have...
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