Converter station DC field neutral bus lightning arrester charged analysis device and method

Abstract

The present invention discloses a converter station DC field neutral bus lightning arrester charged analysis device. The device comprises a neutral bus lightning arrester, a DC neutral bus, an energy absorbing checking device, and a current nonuniformity analyzer. The DC neutral bus generates an operation over-voltage signal in DC system debugging. The primary side of the neutral bus lightning arrester is electrically connected to the DC neutral bus, and after the operation over-voltage signal passes by the neutral bus lightning arrester, the grounding side of the neutral bus lightning arrester generates a discharge current signal. The high voltage end of an impact voltage divider is electrically connected to the DC neutral bus, and the measuring end of the impact voltage divider generates a converted impact voltage signal. The device comprises a plurality of current sampling modules, the input ends of the current sampling modules are electrically connected to the grounded circuit of the neutral bus lightning arrester. The input end of a voltage sampling module is electrically connected to the measuring end of the impact voltage divider. The device has the advantage that energy absorption and discharge current unevenness of the lightning arrester can be monitored in real time during debugging and operation.

Description

technical field [0001] The invention relates to the technical field of direct current system debugging and live monitoring, in particular to the technical field of live analysis of a neutral bus arrester in a direct current field of a converter station. Background technique [0002] With the rapid development of China's social economy and the continuous advancement of science and technology, the demand for electric energy in the whole society is increasing, so the scale of the power grid continues to expand. However, China's energy distribution and economic development are seriously asymmetrical. The eastern and southern economies have less energy, while the western region is rich in energy but relatively backward. Therefore, the effective transmission of energy from the western regions to the eastern and southern regions is conducive to the sustainable development of the national economy. develop. Due to the obvious advantages of high-voltage DC transmission technology in ...

AI Technical Summary

Problems solved by technology

During the operation, it was found that the failure rate of the neutral bus surge arrester was relatively high. On the one hand, because the neutral bus surge arrester needed to discharge a large amount of energy;

However, the neutral bus surge arrester discharge current monitor is not installed on site, so it is impossible to analyze and warn each neutral bus surge arrester fault current and energy, which seriously affects the safe operation of the DC transmission system

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