Device and method for monitoring transient state current-carrying capability of power transmission line

Abstract

The invention relates to a device and method for monitoring transient state current-carrying capability of a power transmission line in the technical field of power systems. The monitoring device comprises a first data acquisition terminal arranged on a power transmission line pole tower, a first acquisition unit, a first control unit, a first transmission unit, a second data acquisition terminal arranged on the power transmission line, a second acquisition unit, a second data control unit and a second transmission unit. The maximum current-carrying capability of the power transmission line can specifically inform a dispatcher of the rest current-carrying capability within the currently rest fault eliminating time, namely the flow of electrical current which can flow through the power transmission line. The maximum safety time can specifically inform the dispatcher of the rest time before the temperature of a line conductor is increased to the maximum permissible operating temperature under the fault current, namely the rest time before fault eliminating. The two indicators can assist the dispatcher to select the safest and most economical fault eliminating way within the shortest time.

Description

technical field [0001] The invention relates to a device and a method in the technical field of electric power system, in particular to a device and a method for monitoring transient current carrying capacity of a power transmission line. Background technique [0002] With the rapid development of my country's national economy and the continuous rapid development of power grid construction, the scale of the power grid has increased year by year, the density of the power grid has gradually increased, and the corridors of transmission lines have become increasingly scarce. Maximizing the use of existing line corridor resources and improving the transmission capacity of lines is not only a need to improve resource utilization efficiency, but also an inevitable requirement for building a strong smart grid. [0003] At present, under the condition of dynamic ampacity calculation and steady-state heat balance, the actual allowable load of the line will pass. Due to the influence o...

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Problems solved by technology

[0012] After retrieving the prior art, it is found that there is no device and method for monitoring the transient ampacity of transmission lines in the prior art, but the transient ampacity is a very important indicator in the case of a fault, and it can indicate the dispatcher in the event of a fault. Take the safest and most economical way to eliminate faults in the shortest time. If the transient current carrying capacity of the line cannot be clearly known, it may lead to improper fault handling, turning small faults into major faults, causing large-scale power outages, and causing serious damage to national production and life. huge influence

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