NEWS

With the arrival of summer, the weather is dry and the weather is dry. It is also the peak of electricity consumption, and it is also a period of high incidence of fires and other accidents. Electricity accidents are also on the rise this season. According to statistics, in May 2021, there will be 7 electricity personal injury accidents and 7 deaths nationwide. The number of accidents increased by 3 and the number of fatalities increased by 1 year-on-year. Among them, there were 6 personal injury accidents and 6 deaths in power production, an increase of 4 accidents and an increase of 4 deaths compared with the same period last year; 1 personal injury accident and 1 death occurred in power construction, a year-on-year decrease of 1 accident and 4 deaths. The death toll fell by 3. No power safety accident occurred, which was flat year-on-year. There was no power equipment accident with a direct economic loss of more than 1 million yuan, which was flat year-on-year. There was no power safety incident, a decrease of 1 incident year-on-year. It is really shocking and heart-wrenching. I hope it can attract the attention of various electric power practitioners, learn more about relevant operation knowledge, improve the ability to prevent and control electric power accidents, and reduce personal casualties and property losses. In particular, power grid companies and power generation companies should also establish corporate emergency response mechanisms in accordance with the requirements of the plan, conduct frequent accident scenarios, and jointly conduct anti-accident drills to improve their ability to respond to emergencies and ensure the safety of power grids and power practitioners. All power infrastructure units should also strengthen publicity and self-examination and self-correction to protect the safety of power transmission.

On the basis of maintaining the safe operation and correct operation of power equipment, more attention should be paid to the quality of equipment and materials used as power transmission, especially in summer, the quality of wires and cables should be paid more attention. You can't see or feel it, but once you are negligent, you often pay a huge price in life. You can even call electricity an electric tiger. In fact, electricity itself is more terrifying than a tiger.

The problem of cable aging is a very big safety hazard. Many fires caused by electricity are mostly caused by cable aging. Therefore, it is very necessary to regularly check whether the cable is aging. However, how to check whether the cable is aging still requires certain skills. . The insulation of our common cables depends on the outer sheath, but after the cables are used for a long time, they will be oxidized or corroded by the air in the air, and the insulation performance of the cables will become lower and lower. , and eventually become hardened or even fall off, and when the cable is aged to this extent, there is basically no insulation capacity, and once the insulation is reduced to a certain level, it is easy to be broken down in the process of use. This can lead to accidents such as fire and electric shock to employees. Understanding the basic knowledge of judging cable aging can eliminate potential safety hazards. The following summarizes some methods and experiences for judging cable aging:

The first is to observe the appearance of the cable along the cable, that is, to observe the insulation layer of the cable. If you find that the cable is hard, the outer layer has cracks, the color is dull, darkened, or even falls off, it means that the The aging problem of the root cable is already serious, and it is best to replace it in time to avoid danger.

The second is a more professional and accurate method, which is to use an insulation resistance meter to measure the insulation of electrical lines. The insulation of different lines has different allowable values. For example, for a household 220V line in use, the insulation resistance should not be lower than 0.22 megohm; the humidity value in rainy days should not be less than 0.1 megohm. If the measured insulation resistance value is less than the above value, it means that there is a problem with the insulation of the electrical line. Of course, the service life of the cable is different under different usage conditions.