On the afternoon of April 14, some netizens reported that there were delays in trains and passenger detention at Beijing South Station, and some trains had been delayed for more than 1 hour. According to the Beijing Railway Administration, due to strong wind, a piece of plastic cloth was hung on the Beijing-Shanghai high-speed rail catenary, resulting in some trains delay. Affected by the accident, Jinan Railway Administration in the management of Qingdao, Jinan and other stations have also appeared different degrees of train delay.
Passenger detained due to late train
At the turn of spring and summer, it is easy to hang kites, balloons, plastic bags, dust nets and other foreign bodies on the contact network. Once the high-pressure power grid above the train is touched by hanging objects, it will lead to power grid equipment damage, circuit tripping and other conditions, seriously affecting the safety of train operation.
Common power grid hanging objects
Catenary is the power source for power supply to electric locomotives, and almost all equipment is in the open air state and there is no standby. Because the voltage of train and high-speed rail is very high, which reaching 25,000 volts, once these foreign bodies wrap around the power supply contact network of railway with the wind, they will affect the normal power removal of the train by the electric bow, resulting in late train and shutdown. It brings many adverse effects to the operation and maintenance of the line.
Traditional cleaning of railway hanging objects
Traditional power grid repairing by climbing
Because power grid's ultra-high pressure, it's not easy to remove foreign bodies. Railway power grid workers need to be fully armed and carry out climbing live operations, which generally take a long time and have a high risk of operation.
In order to ensure the safety along the railway line, China has also issued relevant regulations. According to Article 95 of the Regulation on the Administration of Railway Safety, if a kite, balloon or low-altitude floating object is raised within 500 meters on either side of a railway power line conductor, the public security organ shall order it to correct, impose a fine of not less than 10,000 yuan but not more than 50,000 yuan on the entity, and impose a fine of not less than 500 yuan but not more than 2,000 yuan on the individual.
In addition to strengthening the management regulations, the technical means to clean up foreign bodies also need to be paied attention to. The traditional cleaning method is power failure operation or live operation. However, the equipment power failure will cause economic losses and reduce the reliability of power supply; the live operation treatment method requires personnel to go to the tower for operation and indirectly or directly contact the live body, with high operation risks. Moreover, traditional processing methods require workers to have sufficient physical strength and good tool use skills and experience.
STP laser obstacle remover
Laser obstacle remover operation
Removing hanging objects
Laser removal of bird's nest (identify empty nest bird)
The advent of STP laser obstacle remover (laser cannon) has disruptively changed the mode of operation for foreign body removal: direct remote timely, rapid, and safe removal without equipment power failure or personnel climbing the tower.
STP laser LHW-3A obstacle remover uses carbon dioxide laser based on the material characteristics of transmission line obstacles. On the basis of good directivity of the laser itself, tight beam, concentration and very high energy, the carbon dioxide laser wavelength is long, which can emit far-infrared energy, and can effectively melt and cut non-metallic substances by regulating the excitation power. “The emissible distance shall be sufficient to deal with the obstacles appearing on the high-voltage line, and there shall be a laser power adjustment knob, which can be adjusted according to the distance of the obstacles.”
Obstacle branches removal by laser
Laser cleaning of hornets
Laser emitter can limit its maximum power to clear the hanging object without damaging the wire. Moreover, it can control the duration of laser action to clear the obstacle without damaging the insulator. The laser can control the transmitting power, adjust the effective distance and set the action time, which can cut the obstacles without damaging the transmission equipment. It is a safe laser device for removing foreign bodies.
STP laser obstacle remover
At present, STP laser obstacle remover has been cooperating with power grid, China Southern Power Grid, railway and other departments in many countries to ensure the normal operation of power grid.
