What are the forms of line tripping caused by bird damage? According to the actual statistics and field experience analysis, we can find that bird damage triggered by line tripping there are three main forms: bird droppings flash discharge, bird body shorting and bird nest short circuit, which is the most common due to bird droppings caused by the flash discharge shorting problem.
According to the annual statistics of a province, the number of bird-related faults on transmission lines of 220 kV and above is as high as 36, most of which are caused by bird droppings shorting the air gap. The emergence of this phenomenon makes us have to re-examine and deeply understand the complex relationship between bird droppings and transmission lines.
Bird droppings shorting air gap is an electrical phenomenon, when bird droppings fall on the insulator, its conductivity will make the original isolation of the two electrodes to form a short circuit between the two electrodes, resulting in an instantaneous increase in the current of the circuit, and ultimately triggering the action of the protective device, so that the line trips. As the bird excrement contains a large number of electrolytes, these substances in the wet state has a better conductivity, so in wet weather or after the rain, bird droppings are more likely to cause line tripping.
In addition to guano shorting, the bird itself can cause similar failures. Some small birds may stay on the conductor when flying over a high voltage line due to fatigue or the need to find food. If their wings or tails come into contact with an adjacent conductor or ground at this time, a low impedance path is created, again causing a short circuit and tripping. This phenomenon does not occur as frequently as guano shorting, but when it does, the consequences are usually more serious, even threatening the birds themselves.
How to do? Take a look at Shenzhen real bird repellent technology ZQN-GT-NZ type bird cover (as shown above), it is also called bird umbrella cover, high quality composite insulating material production, appearance of red, the installation position is usually located in the line above the overhanging insulator strings, in order to block the bird droppings, foreign objects falling; In addition to bird cover, there are bird spikes, bird baffle, bird cage, bird occupier, ultrasonic repeller, laser repeller, integrated intelligent bird repellent, etc., are applicable to the field of electric power repellent. In addition to bird guards, there are also bird cages, bird cages, bird occupants, ultrasonic bird repellers, laser bird repellers, integrated intelligent bird repellers, etc., all of which are applicable to the field of electric power bird repellent.
Bird damage in the power system is not an insoluble problem, through the comprehensive use of a variety of preventive strategies, strengthen the monitoring and management, can still significantly reduce the line tripping events caused by bird damage, to ensure the reliability and security of power supply, but also to maintain the balance of the ecological environment.
