Zhanjiang Power Supply Bureau

Zhanjiang, China

Zhanjiang Power Supply Bureau

Zhanjiang, China

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Lin Z.,Guangdong University of Technology | Peng X.,Guangdong University of Technology | Wu X.,Guangdong University of Technology | Ou Y.,Zhanjiang Power Supply Bureau
Dianwang Jishu/Power System Technology | Year: 2014

Taking the characteristic quantity of transient voltage stability of regional power system containing wind farms as objective and taking the minimum probability of falling into overlapping space as the criterion, the simplest feature set is selected from high-dimensional characteristic quantities describing complex power grid to simplify the analysis of transient voltage stability in regional power system containing wind farms, in addition to achieve the aim of reducing the dimensionality of feature indices. The theory of overlapping probability algorithm is presented, and then characteristic quantities are extracted by overlapping probability algorithm. The overlapping space extracted from standard IEEE 30-bus system, the overlapping space extracted from IEEE 30-bus system with wind farm appended and the selected simplest feature set are compared, and the comparison results show that the description of the same power grid by the simplest feature set, which is composed by characteristic quantities with lower dimensionality selected from high-dimensional characteristic quantities by overlapping probability algorithm, is of higher accuracy. Finally, the accuracy of the selected simplest feature set is validated by neural network.


Li J.-H.,Xi'an Jiaotong University | Hou X.-Y.,Xi'an Jiaotong University | Li H.-T.,Zhanjiang Power Supply Bureau | Yue Y.-L.,Zhanjiang Power Supply Bureau | Mo Z.-H.,Zhanjiang Power Supply Bureau
Gaoya Dianqi/High Voltage Apparatus | Year: 2013

A discharge fault in a 110 kV GIS PT chamber was investigated via measurement of SF6 decomposition products and UHF partial discharge detection. A variety of SF6 decomposition products at high level were found in the chamber. UHF partial discharge detection indicated a discharge amplitude of over -20 dBm. Disassembly inspection showed that the discharge was generated by the floating potential due to poor contact between the shield plate at C-phase side and the core clamp in the PT gas chamber. Accordingly, measures for improving the contact are proposed.


Yue Y.-L.,Zhanjiang Power Supply Bureau | Wu Y.-Y.,Zhanjiang Power Supply Bureau
Gaoya Dianqi/High Voltage Apparatus | Year: 2010

At high voltage level, the stray capacitance between earth and resistance ship of seamless MOA imposes significant effect on the potential distribution of the MOA. This paper experimentally analyzes the potential distribution of an MOA for 750 kV alternating-current system by adopting the optical fiber measurement system developed by the authors. This measurement system is composed of electric current sensor, optical fiber, signal processing unit and computer. With the system an MOA for 750 kV alternating-current system is tested under operation voltage, and the current distribution diagram is obtained. The current distribution diagram is then transformed into potential distribution one through simple process. The measured potential distribution shows a good consistency with the theoretical one from the finite element analysis software ANSYS, which verifies the validity of this optical fiber measurement system.

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