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Liu H.,Extra High Power Subcompany of SEPCO | Liu K.,State Grid Electric Power Research Institute of China | Meng H.,Extra High Power Subcompany of SEPCO | Huang Z.,Extra High Power Subcompany of SEPCO
Dianwang Jishu/Power System Technology | Year: 2011

The ±660 kV DC power transmission pilot project from Ningdong to Shandong is the first ±660 kV DC power transmission project in the world. Based on the engineering practice of this project, detailed experimental conditions for the research are determined, and experimental research on the safety distance for live-line working of ±660 kV DC power transmission line under various operating conditions is performed. On the basis of experiments, firstly, the overvoltage multiple occurred in ±660 kV DC power transmission line is determined by theoretical calculation; secondly, according to discharge characteristics of safety distances for various positions where the live-line working is carried out and considering the calculated overvoltage multiple, the minimum safety distance and minimum combined spacing, via which the operators enter into the equipotential working position, for ±660 kV DC power transmission line located at the area with the altitude lower than 2000 m are calculated. Results of this research can offer reference and technical support for live-line working carried out on ±660 kV DC power transmission.

Yin G.,Extra High Power Subcompany of SEPCO | Liu Y.,Extra High Power Subcompany of SEPCO | Xu H.,Extra High Power Subcompany of SEPCO | Li M.,Extra High Power Subcompany of SEPCO | Li J.,SHANDONG LINYI POWER SUPPLY COMPANY
2012 International Conference on Systems and Informatics, ICSAI 2012 | Year: 2012

According to the exiting issues of currently DC system insulation monitoring device, this paper developed a more comprehensive function monitoring device. The device adopted phase different of magnetic modulation detection principle. Though access to the unbalanced grounding relay, it can solve the conventional devices which unable to detect issue like: the DC system grounding simultaneity or equivalent insulation deterioration, with this method the device can determine a variety of ground failure correctly, and it also can predict the insulation decline. Because the 500kV transfer substation exiting serious electromagnetic interference which can make the data of insulation monitoring device inaccurate and work unstable. According to these phenomenon, we use a variety of anti-jamming measures on both hardware and software. This paper describes the overall hardware of the device composition and a detailed description of key technologies. Field experimental results show that the device may change from time to time to monitor the insulation resistance and have the ability to find out the grounding branches accurately; also it has no effects on disturbed capacitance. Currently, the device has been putting into use and working well. © 2012 IEEE.

Xu L.,Extra High Power Subcompany of SEPCO | Feng Y.-Z.,Extra High Power Subcompany of SEPCO | Feng X.-Y.,Extra High Power Subcompany of SEPCO | Gu Y.,Extra High Power Subcompany of SEPCO
Gaoya Dianqi/High Voltage Apparatus | Year: 2012

With regard to Garton effect in routine dielectric loss test, this paper analyzes the problems in 10 kV dielectric loss test, discusses the field test procedure, and describes testing principle of lightweight serial harmonic type HV dielectric loss device. An inverse connection and multi-channel method for HV capacitor dielectric loss measurement is proposed and implemented. The results show that the problems which make field test difficult to be carried out with the traditional method are solved, and the Garton effect on result of dielectric loss test is overcome.

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