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Transformer bushing is an important electrical equipment used in power system, it is important for field testing technology of transformer bushing. There are many feature amounts can be used to reflect transformer bushing insulation condition, which including dielectric loss, leakage current, capacitance, insulation resistance, bushing temperature, transformer oil component, SF6 gas components, the...
As the demand for wireless communication system grows, the need for radio spectrum increases accordingly. In this context, cognitive radio has emerged as a breakthrough for effective utilization of radio spectrum. In order to realize dynamic spectrum management in the future, it is imperative to possess a thorough understanding about how wireless spectrum behaves over time, frequency, and space, etc...
In order to ensure the safety and stabilization of high-speed railway, it is very important to implement on-line monitoring system on traction transformer. The data acquisition, the main control circuit, the program of single chip Micyoco (SCM) and communication protocol, which are the components of the on-line monitoring system of traction transformer insulation, are roundly presented in this paper...
The capacity and feature of a large-sized low-voltage switchgear laboratory are presented in this paper. A monitoring and control system is designed for the laboratory with industrial PC as upper computer and PLC as lower computer. The testing process and programming philosophy of switchgear testing are discussed in detail. WinCC configuration software with a human-machine interface (HMI) is used...
Three hypotheses for steady-state responding, transient responding and resuming behavior of semiconductor gas sensors are proposed, according to which, the logarithm of the steady-state resistance value and the logarithm of the gases concentration obey a tangent function; the transient response is decided by the current resistance of the sensor and the gases concentration; and the resuming behavior...
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