Papers by Keyword: TSC

Abstract: Recently, a hybrid structure called Timber-Steel Composite (TSC), which is assembled by a central steel I beam with wooden block covered, is expected to introduce a potential strength for the design of modern wooden structure. However, information on this type of structure under the influence of fire is not yet sufficiently explicit to provide designers with a reliable index. The aim of this research was to study the behavior of TSC with dowel connection under fire. Three TSC with bolt connected were tested and were burnt under temperature 700 °C within 10 minutes. Testing results showed that after 10-minute fire burning, the temperature of central I beam is not of great increased, indicating that the wooden block help transmits heat although the dowel connections which connect steel and wood is directly exposed to the fire. It is also observed that dowel connection and air gaps caused a relatively high percentage of char for the wood surrounding the bolt as 13% of total area. In conclusion, a useful prediction on char depth no more than 5cm could be estimated for 1-hour testing validating the purpose of applying TSC in future.

Abstract: A simulation model of 230kV substation primary system and TSC+TCR typed dynamic reactive power compensation control system was constituted with RTDS, and the feasibility of control system with a case was validated. The control system was to monitor the variation of power system equivalent susceptance with sampling the power system voltage, established the relationships between power system susceptance and the firing angle of TCR, adjusted TSC switch and TCR firing angle to dynamically compensate the reactive power of power system. The simulation results demonstrate that the control system can guarantee power system voltage stability and real-time adjust power factor.

Abstract: As the increasing equipment of high power and motor load put into coal mine enterprise, the quality of power supply is decreasing, such as low power factor and large voltage fluctuation, etc. After analyzing the theory and algorithm of reactive power compensation in details, studying a system based on STM32 thyristor switched capacitor (TSC) reactive power compensation control system, which includes compensation, control algorithms of nine zone diagram, controller hardware design and software design. The experimental results show that, this TSC system can realize a faster and more accurate measurement and switching, which have an obvious effect of compensation, and a safe and efficient automatic operation of the system.

Abstract: The effect of electrical aging on the trap parameter of HVAC XLPE cable insulation was investigated in this work. Thermally Stimulated Current (TSC) was used to measure depolarization current. The variation of trap parameter was calculated by means of start-up method based on the Gaussian fitting curve of TSC data. It was found that, the activation energy and the amount of trap charge obtained from TSC peak at 243K and 348K were increased after electrical aging, which may be benefit to characterize the degree of aging. The amount of trap charge in the two peaks increases as the increase of oxide dipole after electrical aging. And charge trapped described by the TSC peak at melting temperature increased after aging. It is considered that the increase of charge in the TSC peak can be attributed to the release of trap charge in the melt crystallization process, which corresponds to the α relaxation process in XLPE insulation.

Abstract: The deep levels of carbon doped high resistivity (HR) GaN samples grown by metal-organic chemical vapor deposition (MOCVD) has been investigated using thermally stimulated current (TSC) spectroscopy and high temperature (HT) Hall measurement. Two different thickness of 100 and 300 nm were used to be compared. It was found that four distinct deep levels by TSC and one deep level by HT Hall measurement were observed in both samples, which means great help for the decrease of leakage current and lifetime limitations of device utilizing the structure. The activation energy of these levels was calculated and their possible origins were also proposed. The low temperature traps, might be related to V_N, 0.50 and 0.52eV related to incorporate a high level carbon, 0.57eV related to V_Ga, 0.59eV related to C_Ga or N_Ga, 0.91 and 0.97eV related to interstitial N₁ .

Abstract: Thermally stimulated current (TSC) is a simple and effective test technique to study the thermal activated charge, electron trap and activation energy of dielectric and semiconducting materials. It is well known that the addition of glass frits can improve the degradation property of ZnO varistors. An activation energy of 0.45 eV has been found on the ZnO varistors with/without glass frits after the DC degradation by using TSC method. The tested quantity of thermal activated charges, Q_TSC, may represent the numbers of migrated zinc interstitials. ZnO visitors doped with glass frits have less Q_TSC. Experiment indicates that TSC test is a convenient method to evaluate the degradation behavior of ZnO varistors.

Abstract: In this paper, we improved the home-made EL experimental set-up, have increased the function of TSC, enable the joint measurement of EL and TSC to measure the trap of shallow and deep. It is significant to study material properties. through the Labview8.6 software programming, the data of temperature and current could be collected, then we can get the curve that the current changes with temperature, it is the TSC curve. Experiment result proved the reliability of laboratory equipment.

Abstract: To solve the problem of high reactive power consumption and serious harmonic pollution of the drilling rigs, a hybrid filter device based on a combination of FC-TCR and TSC was studied. Use open loop control, take reactive power as control signal, switch capacitor at voltage’s peak and use piecewise linear method to get reactor’s firing angle. Through MATLAB/SIMULINK, compensation scheme was simulated. Simulation results verified its effectiveness and validity, and it has an important guiding significance on the development of actual devices.

Abstract: The application of electroative polymer devices requires the availability of their propertis at various operating conditions. Cellulose based Electro-Active Paper (EAPap) has been studied as an attractive EAP material for artificial muscles due to its low cost, availability, light weight, large displacement output, low actuation voltage and low power consumption. It is investigated which the underlying mechanism is responsible for their strain-field response. The understanding of the actuation mechanism of this material is important in order to improve the performance and also to better target the application. To physically investigate the actuation mechanism of EAPap, several tests are performed. TSC current showed an evidence of ionic migration effect. Thus, we conclude ionic migration effect associated with dipole moment of cellulose paper ingredients. These effects maybe depend on environmental condition.

Abstract: This article introduces the trigger circuit of series SCRs valve and a new trigger circuit is designed for series SCRs valve of TSC. The trigger circuit is driven by voltage source and a high voltage cable is used for insulation of the pulse transformer. The trigger circuit has simple structure and a steep front of gate-current. This unit is used in 10 kV thyristor switched capacitor (TSC) reactive power compensation device, and the results verify its feasibility.