Many measures to prevent "bird harm" does not slander ""bird harm" is a special term for the power system, is the line workers must do every year, but also the most headache thing." Lu Zhenyu introduction. In recent years, Haining City has been committed to the creation of national garden cities and national health cities, the ecological environment is getting better, and birds are multiplying rapidly. However, the tall trees in the Haining region are scarce, making the high and stable poles a favorite nesting site for birds. Bird nest nests are mostly constructed from materials such as straw, branches, and even wire. When a rainy or foggy weather occurs, it is easily conductive and becomes the “culprit†causing line tripping and blackouts. It is an important factor that jeopardizes the safe operation of the line.
"There is no regularity in bird activities, the construction of the nest is not controllable, and when it fails, it is basically bad weather. Repairs are very tiring, and it is very difficult to handle." Speaking of "bird harm," Lu Zhenyu feels deeply.
Compared to ordinary 10 kV lines, the 20 kV line has become a critical area for “bird harm†due to its low grounding resistance and high technical difficulty. According to Lu Dong, head of the operation and maintenance department of the Haining City Power Supply Company, since its establishment in 2013, the 20-kilovolt line at the 220-kilovolt Zhudong Substation has caused 5 failures due to bird-fighting, all of which have occurred in inclement weather.
After a failure occurs, the power worker must rush to the scene to find and solve the problem and quickly power on. “Manpower, financial resources, material resources, and the safety of employees are all problems. What's more important is that companies and residents are inconvenienced because of power outages and losses.†Lu Dong said, “In order to ensure that electricity is not used in summer peaks. Affected, staff members need to clear the bird's nest without power interruption and install bird repellents. There are some difficulties in the construction process."
According to reports, the Haining City Power Supply Company attaches great importance to the work of “anti-bird damage†and guarantees power supply. At the beginning of this year, a detailed circuit inspection plan was established, and some repairs and live working personnel were deployed to assist in the participation. "Inspection", and according to the weather forecast, strengthen special patrols during the rainy season. At the same time, the company has improved the technical measures against bird-fighting, installing new bird-repellent devices and wire insulation covers on the line to prevent the bird's nest from causing circuit short-circuits, installing wind chimes and windmills on the crossarms, and driving away small birds.
In addition, the Haining City Power Supply Company also organized a detailed summary of the line fault information over the years, analyzed the types of faults, fault characteristics, fault causes, find equipment weaknesses, determine the distribution of bird harm areas, and bird movement characteristics. The study found that the bird damage was mainly due to the presence of weak insulation points on the line equipment, and the construction of the bird's nest caused insufficient clearance. In response, Haining Power Supply Company proposed the concept of insulation of distribution network.
To solve the problem of “insulation clothing†for the power grid “With the improvement of Haining's ecology, we can only rely more on the use of new types of bird repeller and increase the insulation rate of the line to prevent 'bird harm.'†Haining City Power Supply Company Line Area Director Wang Hongbing introduced. Insulation of the distribution network is to isolate the part of the circuit that is vulnerable to animals from the insulating cover, so that the part of the line is not in direct contact with the outside world, thereby improving the insulation protection capability of the line equipment.
In early 2013, Haining City Power Supply Company made a concerted effort to separate and classify different devices and innovate technologies to solve the problems one by one:
For the bare conductors at the top of insulators on overhead line poles, new insulation covers were developed to extend the protection range to 40 cm on both sides of the insulators, fully covering the outer conductors; the insulated conductors with good insulation properties were at the end of the insulators. The wire is covered with insulating tape or insulating plastic cover; at the wire connection, the new wire clamp protective cover; the equipment on the column, such as on-column switch, drop-type fuse, transformer, arrester, cable termination, etc. Specially developed a new type of insulating protective gear, full insulation protection. According to statistics, the company has reformed a total of 87 weak points, and all of them have been installed with electrification to achieve "zero power cuts."
In July last year, after the completion of the insulation of these 20 kV lines, Lu Zhenyu became the most direct beneficiary. In the past, when he encountered typhoon and heavy rain, he worried that the line would malfunction. Since the insulation transformation, these lines did not have one more failure due to 'bird harm'. “Now, there is more confidence,†Lu Dong said. “At the moment we are reviewing the experience and further improving the insulation. We plan to retrofit 17 20-kilovolt lines and 25 10-kilovolt lines during the year.â€
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