Resistive current remote online monitoring system for power transmission line arrester

Abstract

The invention discloses a resistive current remote online monitoring system for a power transmission line arrester. The system comprises a field device and an indoor device adapted to the field device, wherein the field device comprises a signal acquisition and output module and a signal processing and transmitting module connected with the signal acquisition and output module, the signal acquisition and output module comprises a passive resistance online monitor, a signal input device connected with the passive resistance online monitor, and an optical fiber isolation and signal output device connected with the signal input device; the signal processing and transmitting module comprises an analog signal receiving and converting device connected with the optical fiber isolation and signal output device, a phase locked loop connected with the analog signal receiving and converting device, a singlechip connected with the phase locked loop, and a GPRS (General Packet Radio Service) signal and high-frequency radio signal output device connected with the singlechip, wherein a high-efficiency solar battery and a battery management system are connected to the singlechip. The system can be used for mastering the working conditions of an arrester, recording all conditions of the arrester and analyzing and displaying the conditions in time.

Description

Technical field [0001] The invention relates to a detection device, specifically a remote online monitoring system for resistive current of a transmission line arrester. Background technique [0002] High-voltage transmission lines are the infrastructure for power transmission in the power system. Their safe operation is of great significance to economic construction, people's lives, social stability, the power system itself, and even national security. In high-voltage transmission lines, the use of zinc oxide arresters (MOA) has become relatively common. Zinc oxide arrester (MOA) has the advantages of large flow capacity, low residual voltage, fast response speed, and long life. It can effectively protect power equipment and is widely used in overvoltage protection of power systems. Since MOA has good nonlinear resistance characteristics, there is no gap inside the zinc oxide arrester. Precisely because there is no gap, during normal operation, the valve plate is subjecte...

AI Technical Summary

Problems solved by technology

It is precisely because there is no gap that the valve plate is subjected to the operating voltage of the power system for a long time during normal operation, as well as the influence of factors such as internal moisture or overheating, which will cause the deterioration of the non-linear resistance characteristics of the valve plate

The main manifestation of this deterioration is the increase of resistive current under normal voltage. The increase of resistive current causes the increase of calorific value, which makes the internal temperature of the arrester rise, and the rise of temperature accelerates the aging of the valve plate, forming a vicious cycle. Finally, the MOA is damaged due to overheating, which may cause the explosion of the arrester in severe cases, causing large-scale power outages

[0003] In order to carry out effective online monitoring of lightning arresters on transmission lines and ensure the normal use of lightning arresters, there are currently three main forms of monitoring lightning arresters on transmission lines: one is the online monitoring of the number of operations of lightning arresters and the full current, which is only enough to measure the lightning strikes of lightning arresters. The number of times and the full leakage current of the arrester can only be used as the basis for equipment maintenance, and cannot make a direct judgment on the deterioration of the arrester

The second is the visual online monitoring of arresters. This device uses the current advanced 3G technology to directly observe the surface conditions of the arrester, but cannot understand the internal working conditions of the arrester, and cannot directly judge the deterioration of the arrester. It can only be used as a reference for repair and maintenance of the arrester.

The third is to take the auxiliary signal on the PT (potential transformer). The result is calculated by the mathematical method. Since it is obtained by indirect measurement, it is greatly disturbed by the third harmonic, and the stability of the final result is poor. More importantly, this method is difficult to implement on the line (there is no PT on the line, and the signal cannot be collected)

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