A Real-time Calculation Method of Overhead Conductor Sag in High Temperature Weather

Abstract

The invention relates to a real-time calculation method for sag of an overhead conductor in hot weather. The method comprises the following steps: collecting environment temperature and load current at a position where the overhead conductor to be tested is arranged; establishing a functional relation (1) among the load current of the conductor, the environment temperature and the conductor temperature; establishing a functional relation (4) among the load current of the conductor, the environment temperature and the conductor sag; calculating a conductor sag calculated value f1 of the tested conductor in the measured environment temperature and load current according to the functional relation (4), and measuring a sag measured value f2 of the tested conductor in field by using a range finder; comparing f1 with f2, and correcting the functional relation (4) until the difference value of the conductor sag calculated value and the measured value is in an allowed range; calculating the sag value of the overhead conductor in real time according to the real-time environment temperature value and the real-time conductor load current value. According to the method, less data is required to be detected and less equipment is required, and real-time control of the conductor sag can be realized.

Description

technical field [0001] The invention relates to real-time calculation of conductor sag, in particular to a real-time calculation method for overhead conductor sag under high-temperature weather. Background technique [0002] Sag, also known as sag, is the maximum amplitude of sagging of overhead wires. Sag is closely related to the fire protection of overhead lines. If the sag of the line does not meet the specified requirements, if the sag of the line is too large or too small, it may cause a disconnection grounding fault due to the stress of the conductor exceeding the allowable value, and even damage the tower structure where the conductor is erected or the wind blows. The cycloid causes phase-to-phase short circuit, generating arcs and electric sparks to ignite the surrounding combustibles. Especially during the windy summer power supply period, the line load is heavy, the ambient temperature is high, and the sag drop is large. It is very easy for the sag to fail to mee...

AI Technical Summary

Problems solved by technology

[0010] The above three utility model patents and invention patents [201310159467.6] require a lot of equipment, and the results in the application are greatly affected by the site environment, and the long-term operation is limited

[0011] The announcement date is July 30, 2014, and the Chinese patent method with the announcement number CN103954242A is simple, but the wireless transmission distance is limited, so it is not suitable for evaluating the sag of the entire overhead line

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