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The characteristics of the residual voltage of a surge protective device (SPD) connected to an overhead distribution line due to nearby natural cloud-to-ground lightning and to rocket-triggered lightning are analyzed in this paper. The residual voltage of the SPD is found to be closely related to the ground potential rise at the grounding terminal of the SPD. For natural lightning occurring 1.8 km...
Transmission lines are operating close to their limit with the promotion of power networks interconnection. The possible non-fault overload caused by the transferred flow from a removed line may lead to incorrect operation of zone 3 distance protection, which is considered as the origin of several well-known cascading trips. Taking advantage of wide area measurement system (WAMS), a novel scheme is...
This paper involves a method for height measurement of the virtual objects in a gray-scale image, it is based on the algorithm of level set method through level set function gray gradient changes. This method is adequate on height measurement on calculation and could be used in rich areas such as wave height measurement.
A method to estimate line parameter of power grid based on innovation graph is proposed. This method identifies network parameter error location according to feature that the innovation values of the branch with parameter error and the correlated branches are larger than other branches in the network, and then estimates the real parameter value based on the Kirchhoff's voltage Law by using PMU measurements...
Optical methods for the measurement of current and voltage in high-voltage (HV) environments have been attracting more and more attention in the recent years. A novel electronic current transformer (ECT) with optical transmitting link and optically powered technology has been designed for metering or protection purposes. The structure of the ECT is described in detail in the paper. An ECT prototype...
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