UAV powerline inspection can observe the high-voltage transmission line in the air at different angles, hovering and shooting multi-angle image and video data, which can detect the defect of the transmission line and the hidden danger of the channel quickly, intuitively, comprehensively and accurately. The investigation can obtain the best on-site information under complicated terrain and bad weather conditions, effectively compensate for the shortcomings of the traditional way of patrolling blind spots, thereby improving the working efficiency of the first-line inspection personnel.
In actual work, when using a drone to patrol a transmission line, the patrol efficiency is closely related to the operator's familiarity with the operation of the aircraft and the complexity of the environment. For example, some skilled grid employees can use their aircraft to patrol dozens of towers a day. Some employees can also use the environment to bring them the advantage of operating the aircraft to the tower on the island a few kilometers away. In contrast, some "new drivers" who have just learned to fly may need several times to complete some veteran inspection targets. This article will take the daily transmission line inspection operation as an example to analyze how to efficiently carry out the daily patrol operation of a transmission line on a section of the line.
Work machine type selection
According to different tasks and line environment, different models can be used to perform inspection tasks in different environments. For example, when using visible light patrol work in mountainous areas or coastal areas with more gusts, use the SKYLLE 1550 series such as MMC to operate the drone with high power redundancy, which can effectively reduce the flight instability of the drone due to wind resistance reduction. Status; when you need to perform infrared or nighttime special patrol work, use a dual-light infrared camera such as Thyea ZT40 or a visible light device with a fill light function such as Thyea N30Lto better perform its work, and achieve good steel for the blade. Precise work results.
At the same time, early equipment inspection and preparation work is also very important. First of all, we must fully understand and understand whether the equipment we carry meets the inspection requirements, such as the matching of the number of batteries and the workload, the inspection of the battery status, etc. The flight is well prepared.
Selection of the on-site environment of the inspection line
The condition of the terrain conditions, the presence or absence of a site that allows for take-off and landing, whether the flight space has a wide field of view, and no obstruction. The route to be patrolled should be surveyed in advance (satellite map, line construction design plan, topographic map, etc.) to segment the line. Avoid the risk of losing contact and crashing when you are on a formal patrol and flying out of the remote control range.
Selection of inspection flight plan
Route planning, sequence arrangement, selection of key parts (insulators, pins or nuts, etc.) on the line tower, control of exposure compensation, control of exposure compensation, etc., and design efficient route schemes as much as possible under limited conditions.
Wire inspection height selection
Due to its gravity, the transmission line generally hangs down and is lower than the height of the tower itself. At this time, if there is a need for a flight inspection of the line, a constant follow-up recording of the required patrol line is required. At this time, the flying height of the aircraft is not at the same height as the wire, and the distance difference and 1-2 meters are superior to prevent the collision line and crash due to operational errors.
Channel inspection height selection
In the daily inspection operation, in the process of starting the operation, the working height needs to be selected above the ground line, and the aircraft can start the operation after the aircraft reaches the specified flying height to prevent the aircraft from colliding.
Selection of inspection operation radius
Affected by the characteristics of endurance and short-wave RF signals, the operating radius should not exceed 2.5km, and the battery power should be reduced to 35%-40%. It should be considered to return immediately at full speed to avoid triggering low-power forced landing, resulting in the loss of the drone.
The inspection of drones should have four principles: safety, efficiency, comprehensiveness and speed. During the inspection, it was found that the inspection of drones was often unable to reach the ground and inspect the tower bases due to the terrain of the forest. Too low flying height will also have a significant impact on work efficiency due to the increased difficulty of flight.