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Measuring the leakage current of insulator surface is an implementable and effective method to evaluate the insulator contamination. This paper proposed a portable leakage current monitoring system for site outer insulation studies. Difference mode has been applied in this system for common mode signal reduction. The synchronous sampling rate can reach 20kS/s, which can record full information in...
Pollution flashover has been a serious threat to the operation safety for the power system. Online monitoring is one most important way for the operation and maintenance of power system. The leakage current on insulator surface is a comprehensive reflection of the insulator surface contamination, environmental conditions and other affecting factors. The purpose of outdoor insulation state on-line...
In China, the haze is breaking out, and it cannot be solved in a few decade years. In this paper, we used haze simulation laboratory, simulated the particulate concentration through the control experiment, and measured the soil reflectance under the different the particulate concentration. Then we analyzed the effect of different hazes on the different soil moisture reflectance: the reflectance is...
The thesis presents the contamination flashover voltage forecast model with the maximum leakage current, ambient temperature, humidity and other multi parameters on the basis of the research conclusion on insulator string contamination characteristics, so as to realize the online monitoring and evaluation on the contamination condition of the power grid. It comprehensively takes the calculation results...
Fast, accurate, real-time measurement of gas concentration is an important task for preventing the coal mining disaster. Combining tunable diode laser absorption spectroscopy (TDLAS) technique with distributed fiber sensing technique, a multipoint fiber optic sensors system for gas monitoring is designed. The wavelength modulation technique and harmonic detection techniques are used to obtain the...
Information infection and information leakage in computer systems are mainly caused by insecure network access. Considering the particularity of network security, a tool DTAD (dynamic taint analysis detector) for information flow security detection is designed and implemented, aiming at the problem of data security in network access. This tool performs log recording and state controlling for malicious...
In order to guide the design and improvement of grading and shielding rings to meet the requirements of UHV projects in China, research on corona characteristics of these components is needed. One of the difficulties is that there is a lack of a proper definition of visible corona. It is common using visual observation, which is easily effected by subjectivity and the observation background. In this...
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