Applied Mechanics and Materials Vols. 602-605

Abstract: Discharge of failure was the fault type are likely to occur in transformers, bushings, transformers, and the extent of damage to the equipment is a serious and direct impact on the stable operation of the system, first introduced the principle and gas chromatographic analysis its test methods, then gas chromatography equipment discharge failure is how to judge the conduct described. Through the analysis of transformer oil chromatographic method can be found as early as possible transformers and other equipment inside the existence of latent failures, thus chromatography is to oversee and guarantee the safe operation of an important means of transformer.

Abstract: Micro inertial measurement unit integration storage test system is a typical multi-sensor information fusion system consists of microsensors. The Federated Kalman filter is applied to micro inertial measurement unit integration storage test system. The general structure and characteristics of Federated Kalman filter is expounded. The four-order Runge-Kutta method based on quaternion differential equation was used to dispose the output angular rate data from gyroscope, and the recurrence expressions was established too. The control system based ARM Cortex-M4 master-slave structure is adopted in this paper. The result shown that the dimensionality reduced algorithm significantly reduces implementation complexity of the method and the amount computation. The filtering effect and real-time performance have much increased than traditionally method.

Abstract: Stress of trunnion was tested by resistance strain gauges during the fire testing of a gun. The main stress and the actual allowable stress of the material were compared and analyzed. Stress changes of trunnion were acknowledged. Faults monitoring and eliminate of artillery fire system was provided with proofs.

Abstract: In recent years, 66kV vertical TCR-type SVC was put into operation in several transformer substations at home. Compared to the compensation mode of the conventional 35kV SVC which is connected to 66kV busbar through by way of step-down transformer, the vertical compensation mode has the advantages of low loss and small maintenance amount. However, it is found that damage of phase controlled reactor in TCR happens in several scenes, and the technicians and research institutions studied this problem from such aspects as phase controlled reactor manufacturing process, SVC control strategy and natural environment of the transformer substations and obtained their own conclusions. This paper uses PSCAD software to conduct a simulation research on the 66kV vertical SVC system installed on a 220kV transformer substation at home and concluded that the SVC switching overvoltage might be the direct cause leading to damage of phase controlled reactor.

Abstract: In order to solve the problem of low voltage at a terminal rural power grid 66kV substation, a 5000-kilovar SVG is arranged in the substation to elevate and stabilize the 10kV bus voltage. Since put into operation, SVG runs well, solving the problem of low voltage while lowering the loss of the entire line. However, in some cases, people find that while stabilizing the bus voltage, SVG causes voltage drop in adjacent substation, and act of the intelligent capacitor unit in the adjacent substation, thus leading to opposite reactive response of SVG, affecting voltage stabilization of the two substations and adding up to equipment loss. This paper analyzes this phenomenon and has proposed an approach of correction.

Abstract: The dry hollow reactor has the features of good inductance linearity and heat dissipation and is not easy to produce ferromagnetic resonance with capacitive load in the system. Therefore, the phase controlled reactor in TCR-type SVC is usually a dry hollow reactor. According to years’ actual operating condition, the phase controlled reactor in 35kV SVC or SVC at a lower level operates stably while tree discharge or breakdown failure frequently happens to the phase controlled reactor in the 66kV vertical SVC, which seriously affects the stable operation of the equipment. This paper puts forward a method of installing arrester on the phase controlled reactors to relieve the SVC switching overvoltage impulse and protect the phase controlled reactors. Besides, it uses PSCAD to conduct a simulation and verifies the feasibility of this method.

Abstract: In this paper, after introducing the concept of far zone field, expression of the electric and magnetic field intensities of symmetrical center-fed dipole is derived based on structure of the array antenna by the electric field intensity formula of symmetrical center-fed dipole. When the electric field intensity of the array antenna is known, the direction function of the array antenna is obtained by concept of the primary pattern and array pattern , Finally, computer programming simulation is used to realize the visualization of the direction function of the primary pattern and array pattern. . In this way, the accurate data and precise curve are obtained so the goal of direct-viewing analysis of the problems is achieved.

Abstract: A novel binuclear ruthenium alkynyl complexes with dithienylethene unit [{(MePh-tpy)(PPh₃)₂RuCl}₂(C≡C-DTE-C≡C)](ClO₄)₂ (II) has been synthesized and characterized by elemental analysis and NMR spectra. Its photochromic behaviors and redox properties have also been investigated. The results indicated that the open-ring isomers of the metal complex could be triggered, either by light or electricity, to convert to their closed forms.

Abstract: The influence of space charge in the space electron beam focusing system is introduced.Then charge-quantity distribution method which is used to calculate the density of space charge and the Computer Aided Design (CAD) method are put forward The result by programming calculation shows that the method is correct.

Abstract: In the paper, the system model of photovoltaic grid-connected inverter with APF function is established, proposing HCC-SVPWM control method based on the analysis of voltage space vector and detecting current by using i_p-i_q algorithm. The system not only makes full use of PV power, but also compensates harmonics and reactive currents of the loads very well. The availability of such theory is proved by the simulation.