Online Measurement And Recording Of Transient Overvoltage In Power System

Stable power system reliable and safe operation related to the stable development of the whole society and economy. The higher voltage transmission lines, the smaller the loss, so the transmission line voltage level higher and higher. With the implementation of the national strategy for EHV and UHV, higher level voltage transmission lines, more and more requirements for insulation and over voltage monitoring performance requirements also higher. In order to better study the phenomenon of over-voltage power system, to maintain safe and stable operation of power system, the implementation of reasonable and reliable insulation strategy, design a reliable, excellent performance and reasonable cost of the line voltage monitoring and recording system is more and more demand and markets high-frequency voltage signal can be accurately recorded, while with the absolute time scale, to make up for lack of fault recorder system can only record the amount and frequency of part of harmonics, and fault recording systems can complement each other. This paper describes the Distributed Overvoltage Online Monitoring System device hardware design and implementation, and proposed to raise the electric field induced overvoltage monitoring system and fault recorders networked information systems integration, the formation of a fault type identification, fault location has, fault impedance ranging, high-frequency voltage over-voltage traveling wave recording and other functions distributed monitoring system. Disturbance is reliable and stable, comprehensive and accurate recording fault information, and there is the steady-state recording functions, a variety of abnormal conditions can be a long a wide range of recording power system, including, overvoltage, overcurrent, mutation, quantitative position switch Information, transformer oil pressure, temperature, etc., but because of their own fault recorder signal acquisition fast enough and voltage transformer itself is not a good pass becomes a high-frequency signal, so there is no way fault recorder records such as lightning strikes over-voltage and over-current events. The overvoltage monitoring device based on electric field sensor can be a very good record over-voltage high-frequency signal, while failure information with satellite absolute time scale, so overvoltage monitoring systems and fault recording system information fusion and complementary analysis, so that the power overvoltage monitoring system perfected. In addition, over-voltage monitoring device can also be based on the effective electric field induced voltage traveling wave signal recorded using fault recording system accurately determine fault type, fault time, according to the information filtered to determine fault information system voltage, to determine the voltage traveling wave time with a double-ended traveling wave method accurately locate the fault location, which is a great fault recorder mentioned range accuracy, from the principle of solving the fault recorder has been plagued by the problem of impedance and distance allowed traveling-wave devices susceptible to interference from starting.