Power transmission line sag on-line monitoring method and device

Abstract

The invention discloses a power transmission line sag on-line monitoring method. The method includes: firstly installing an on-line monitoring device on the lead between two adjacent towers and close to one tower, using a laser range finder to measure the vertical distance from the tops of the two adjacent towers to the ground and the horizontal distance between the two adjacent towers, and recording data; energizing the power transmission line, and adopting a lead mutual inductance energy acquiring way for the on-line monitoring device; configuring the measured data into the on-line monitoring device by means of GPRS or a handset; measuring the inclination angle between one lead end and the horizontal plane by an inclination angle sensor; employing an accurate sag calculation method to calculate the height from the lowest point of the lead to the ground by a microcontroller in the on-line monitoring device; composing the position, sag, equation and inclination angle information into a data frame by the on-line monitoring device, and sending the data frame to a remote server or internet through GPRS. The method and device provided by the invention performs mathematical modeling on the power transmission line, accurately calculates the maximum sag value, and is conducive to on-line monitoring of the sag.

Description

technical field [0001] The invention relates to the technical field of power system monitoring, in particular to an online monitoring method and device for sag of a transmission line. Background technique [0002] Transmission line sag is the main indicator of line design and operation, which is related to the operation safety of the line, so it must be controlled within the scope specified in the design. The sag of the transmission line changes with the increase of the operating time and the change of the climate and the environment along the line. The change of the sag of the conductor of the transmission line will cause the safety distance of the conductor to the ground or to the cross object to fail to meet the requirements of the regulations, threatening the safe operation of the line. Even cause line failure, bring huge economic loss and personal safety threat to people's production and life. Therefore, the wire sag needs to be limited within a certain range, and the ...

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Problems solved by technology

[0003] At present, the sag monitoring methods of transmission lines mainly include: inclination measurement method, temperature measurement method, tension measurement method, radar ranging, laser ranging and image method, among which the temperature and tension measurement method needs to obtain the initial operating conditions of the overhead line, Relying on the state equation of the overhead line for calculation, and there are large errors in the change of the monitored environmental conditions. The monitoring methods of radar, laser ranging and inclination method are complicated, and have high requirements for the monitoring system. The cost is expensive, which is not conducive to large-scale Installation monitoring

None of the above measurement methods can realize real-time online measurement well, the measurement period is long, the efficiency is low, more manpower is required, and the accuracy will be affected. Therefore, it is necessary to find a simple and convenient monitoring method to realize the monitoring of transmission line overhead lines. Sag monitoring

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