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Relay Protection Setting Calculation and Analysis of Large Hydropower Station and High Voltage Power Network

Author: ZhangLie
Tutor: YinXiangGen
School: Huazhong University of Science and Technology
Course: Proceedings of the
Keywords: Large-scale hydropower Auxiliary Power System With rod and double circuit lines Ground distance protection Setting Calculation
CLC: TM773
Type: Master's thesis
Year: 2008
Downloads: 232
Quote: 0
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Abstract


Its safe operation of the issues of concern as comprehensively promote the construction of China's electric power system, large and extra large hydropower construction, resulting in greatly increased complexity of the auxiliary power system in order to ensure the stable operation of power plants and even the system, which related relay its tuning technology raised new issues. In addition, the same pole and double circuit lines widely used, but also put forward higher requirements for high voltage power grid relay protection setting. Large hydropower plant electricity system, as well as the high-voltage grid, with specific projects at the same time to complete its relay setting calculation, analysis of both relay setting in special issues, and proposed the corresponding solution method. This article first large hydropower plant electricity system relay protection characteristics. In order to ensure the reliability of large-scale hydropower supply, auxiliary power system uses more power mutual standby power systems and complex supply network, such as the Three Gorges Right Bank Power Station auxiliary power unit system configuration powered Waiyin power supply as well as a dedicated power supply The three power supply in a power plant, and the formation of a small power supply network contains more than the supply voltage level, and more cross-ring network. The complex structure of the network require auxiliary power system configuration of the various forms of protection devices to ensure the safe operation of the auxiliary power system. This not only increases the complexity of the configuration and coordination of the auxiliary power system protection, but also to the relay setting calculation brings many technical difficulties. Based on the operational requirements of the Three Gorges Right Bank Power Station Auxiliary Power System Protection on the basis of in-depth analysis of the characteristics of its auxiliary power protection system at actual build a model of the Three Gorges Right Bank Power Station Auxiliary Power System conducted a variety of calculation of the short-circuit current, and complete the work of auxiliary power, high-pressure system protection setting. Thesis focuses on the protection of special problems in tuning the research and analysis, and to propose practical solutions. The setting has been applied to the field running successfully put into operation to ensure that the first units of the Three Gorges Right Bank Power Station. Has been more widely used in the power grid to meet the needs of long-distance, high-capacity transmission grid construction with rod and double circuit lines. Double circuit line between the zero-sequence mutual protection devices great impact protection devices cause in some cases misuse or refuse to move. Start from the same tower failure characteristics of the double loop combination of zero-sequence equivalent network analysis of the zero-sequence mutual zero sequence directional element, pilot protection, the protection of ground distance. And then discuss the zero-sequence mutual impedance ground distance protection measurement error, comparative study based help increase coefficient, based on the feelings of the amount, as well as comprehensive help increase factor of three ground distance protection setting method to analyze the respective advantages disadvantages and scope of application. On this basis, for a foreign power grid transmission line grounding distance protection setting viable tuning program. At present, the power grid has been put into operation, tuning results by actual proof to meet the requirements of system operation. The last, the full text of a summary, and pointed out that the next step needs to be done.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system protection > Line Protection
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