Abstract
This paper proposes the dual-terminal positioning method of using ground potential traveling waves to locate the fault location of transmission lines. The traveling wave monitoring terminal is installed at the ground potential end. Installation and maintenance do not need to cooperate with the power outage plan, which can effectively solve the problem of inconvenient maintenance toward the distributed fault diagnosis system. Overhead transmission lines with 110 kV and higher voltage generally have ground lines. When a lightning strike or ground fault happens, not only will a fault traveling wave be generated on the line but also a fault traveling wave will be generated at the ground potential end and propagate along the tower. As the traveling wave current propagating along the ground potential can be effectively detected, the double-ended positioning of the ground potential can be realized. The application in the actual grid shows that a distributed monitoring system on the line tower and the ground line can quickly and accurately determine the fault location.
Highlights
At present, with the continuous expansion of the scale of smart power grids, the risk is increasing and the requirements for safety and reliability are becoming higher and higher
This paper proposes a two-terminal traveling wave fault location method based on the ground potential terminal transient current monitoring
The traveling wave current is monitored at both ends of the fault point, and it is used with Global Positioning System (GPS) for precise timing
Summary
With the continuous expansion of the scale of smart power grids, the risk is increasing and the requirements for safety and reliability are becoming higher and higher. The terminals adopt the power supply mode of coupling energy, use a wireless network to communicate, and rely on Global Positioning System (GPS) time synchronization technology to achieve precise positioning of dual-terminal traveling waves.. The terminals adopt the power supply mode of coupling energy, use a wireless network to communicate, and rely on Global Positioning System (GPS) time synchronization technology to achieve precise positioning of dual-terminal traveling waves.5,6 This technology requires the faulty traveling wave collection terminal on the high-voltage line, and the installation and maintenance need to be carried out during power outages, which is inconvenient. This paper proposes a distributed transmission line fault precise localization technology based on the ground potential terminal transient information perception and develops a traveling wave monitoring terminal installed at the ground potential end of a transmission tower. Under the premise of ensuring the accuracy of the fault location on transmission lines, it realizes the installation and maintenance of the device at the ground potential end
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