Ultrahigh-tension line fault detection and location method and fault detection and location device

Abstract

The invention relates to the field of power monitoring, in particular to an ultrahigh-tension line fault detection and location method and a fault detection and location device. The method comprises the following steps: sampling the current phase information at the two ends of a high-tension line to be detected at the same time respectively to obtain phi1 and phi2; calculating difference between phi1 and phi2 to obtain the difference psi=phi1-phi2; setting an alarm value, wherein when psi is greater than the alarm value, the high-tension line to be detected has fault; and after judging that the high-tension line to be detected has fault, sending fault information to the outside. The fault detection and location device comprises a fault detection module, a fault analysis module and a fault signal output module, wherein the fault detection module comprises a local end measurer as well as an opposite end measurer; the local end measurer and the opposite end measurer are connected to the fault analysis module respectively; and the fault analysis module is connected with the fault signal output module. According to the invention, the fault detection for the high-tension line is simple, accurate, quick and the like, the workload of line searching can be effectively reduced, and the fault repairing time can be shortened.

Description

technical field [0001] The invention relates to the field of electric power monitoring, in particular to an ultra-high voltage line fault detection and positioning method and a fault detection and positioning device. Background technique [0002] With the continuous development of the power system, there are more and more ultra-high voltage and long-distance transmission lines, and the accurate location of line fault points is even more important. In order to reduce the workload of line search, shorten the fault repair time, save a lot of manpower and material resources, improve the reliability of power supply, reduce the loss of power failure, strengthen and improve the level of system operation management, it is urgent to accurately find the fault point when the system fails . [0003] The rapid and accurate positioning of high-voltage transmission line faults has not been solved for a long time, which directly affects the power supply recovery time of the faulty line, an...

AI Technical Summary

Problems solved by technology

However, there are more or less the following problems in field operation: ① affected by the transmission characteristics of voltage and current transformers; ② affected by line parameters and system parameters; ③ fault transient harmonics affect measurement accuracy

[0009] The key to traveling wave positioning is the synchronization of time and the capture of traveling wave head. At present, there are mainly the following problems: ① the stability and accuracy of GPS clock; The sudden change signal of the traveling wave may cause the traveling wave positioning device to malfunction; ③The fault near the zero crossing of the voltage, the traveling wave head is flat, and it is difficult to accurately capture the arrival time of the traveling wave; ④The fault in the near area is limited by the sampling frequency, and the detection is difficult; ⑤ The dispersion characteristic of traveling wave transmission leads to the attenuation and distortion of the traveling wave head, and the slowing down of the traveling wave head affects the positioning accuracy of the traveling wave

Restricted by the above factors, traveling appointments and traveling wave positioning are also subject to certain restrictions in on-site operation

Images