The grounding line is the lifeline to ensure the personal safety of workers. The operation of installing and dismantling the grounding line is a dangerous operation in the electrical operation. Once an accident occurs, the impact is great and the consequences are serious. It is not uncommon for accidents in the power system to have live grounding cables or grounded lines to transmit power, and they are listed as one of the most common maloperational accidents. They are also the main source of human-caused equipment accidents and human casualties. Ensuring the correctness of installing and dismantling the grounding wire is an important task for safe and reliable operation of the substation. To eliminate the occurrence of man-made liability accidents, we must standardize management, start from the subtleties, and check at multiple levels. Let everyone start from me, start from the side, and really pay attention to safety from the heart and promote the safe production of the company.
First, the grounding line should not be stored on the number of 1. As some power supply companies do not attach importance to the management of grounding line, the grounding line is neither numbered nor fixed point storage, sometimes stacked together. When it is used, it is taken casually, and after use, it is not checked, and the leakage of the grounding cable causes frequent accidents with grounding power transmission. Article 82 of the "Safety Regulations" has stipulated clearly: Each group of grounding lines should be numbered and stored in a fixed place. The storage location should also be numbered, and the grounding line number and storage location number must be the same. The operation ticket and work ticket system require the grounding line number. Some substation personnel on duty are not very aware of safety, and think that the number of grounding lines in substations is not many, the probability of accidents is low, and management work is slackened.
2. The operation of the grounding wire is mostly temporary, and it is very easy to cause omissions. The misconnection and the missing grounding wire will bring great harm. The grounding wire should be numbered and stored in a fixed numbered position. It should be used according to the number when handling work tickets and using operation tickets. It can reflect the use of the grounding wire of our company in each operation task of the substation. The actual amount of returned data can be checked at a glance by checking the fixed storage point, so as to prevent the occurrence of a vicious accident with a ground wire to the power supply due to the leakage of the ground wire.
Second, the ground should not use the ground with five anti-computer devices pile 1. In the transformer station equipment maintenance, in order to ensure the personal safety of workers to install a temporary grounding line, grounding is generally used to receive equipment Frame ground lead down position, if there is no monitoring means likely to cause leakage of the assembly and disassembly of the ground wire phenomenon. The grounding line is a reliable safety measure to protect workers from sudden calls at the work place. Currently, effective measures are to place the grounding fixed end of the primary equipment in the substation and to install the five-prevention device on the fixed end. If the primary equipment of the substation is properly equipped with a ground wire microcomputer anti-misoperation locking device, it can effectively reduce the occurrence of misoperation accidents.
2. The operation of the temporary grounding line (installation and removal) must be incorporated into the normalized management. The operation process must be blocked by the anti-misoperation locking device, that is, simulated and operated by the electronic key memory program to completely reduce It is only because the operator remembers or operates the sequence that it is easy to appear misunderstanding, so that it really operates according to the logic of computer memory, and effectively guarantees that the accident with the grounding line closing power transmission.
Third, the voltage transformer should not be installed on the secondary side of the short-circuit ground wire 1. Some power supply company's maintenance team in the substation on the 10 ~ 500kV voltage transformer repair work, the first work for the transformation of electricity Ticket security measures require that only a grounding isolation switch (knife switch) or grounding wire be installed on the primary side of the voltage transformer, and it is not required to short-circuit the grounding on the secondary side of the voltage transformer. In the course of work, the primary side connection of the voltage transformer is removed, and the maintenance personnel working on the voltage transformer lose the protection of the short-circuit grounding.
2. The short-circuit grounding on the secondary side of the voltage transformer is very important for ensuring the safety of maintenance personnel. Before the overhaul of the voltage transformer, the grounding switch or the grounding wire has been installed on the primary side, and the safety measures such as secondary circuit fuse (insurance) have been withdrawn. But in actual work, after disconnecting the voltage transformer once, it will lose the protection of the short-circuit grounding. When the secondary circuit malfunctions, the voltage transformer will have a reverse voltage on the primary side, endangering the maintenance personnel. Personal safety.
IV. Installation and disassembly of the grounding cable should not be recorded 1. The primary operation equipment installation and removal of the grounding line in this substation is an important operation content. The on-duty personnel did not record clearly on the relevant "Checking tickets is enough, and safety work is guaranteed.
2. The operation of the grounding wire As the main danger point of the electrical switch, avoiding and controlling the dangerous point is an effective method to prevent the occurrence of an electrical misoperation accident. Therefore, the management of the grounding wire is strengthened, that is, the installation and removal of the primary equipment inside. Grounding line is an important operation content. On-duty personnel are clearly recorded in the relevant register in accordance with the relevant regulations, and it is entirely possible to eliminate the occurrence of misoperation accidents.
3. On-duty personnel are clearly recorded in the operation log and the "grounding line operation register" according to the work ticket, installation and removal of grounding wires for work tasks. Before resuming power transmission, it is necessary to first check whether all the tasks in the operation log and register have been completed and whether the grounding line has been completely dismantled and clearly explained during the handover.
First, the grounding line should not be stored on the number of 1. As some power supply companies do not attach importance to the management of grounding line, the grounding line is neither numbered nor fixed point storage, sometimes stacked together. When it is used, it is taken casually, and after use, it is not checked, and the leakage of the grounding cable causes frequent accidents with grounding power transmission. Article 82 of the "Safety Regulations" has stipulated clearly: Each group of grounding lines should be numbered and stored in a fixed place. The storage location should also be numbered, and the grounding line number and storage location number must be the same. The operation ticket and work ticket system require the grounding line number. Some substation personnel on duty are not very aware of safety, and think that the number of grounding lines in substations is not many, the probability of accidents is low, and management work is slackened.
2. The operation of the grounding wire is mostly temporary, and it is very easy to cause omissions. The misconnection and the missing grounding wire will bring great harm. The grounding wire should be numbered and stored in a fixed numbered position. It should be used according to the number when handling work tickets and using operation tickets. It can reflect the use of the grounding wire of our company in each operation task of the substation. The actual amount of returned data can be checked at a glance by checking the fixed storage point, so as to prevent the occurrence of a vicious accident with a ground wire to the power supply due to the leakage of the ground wire.
Second, the ground should not use the ground with five anti-computer devices pile 1. In the transformer station equipment maintenance, in order to ensure the personal safety of workers to install a temporary grounding line, grounding is generally used to receive equipment Frame ground lead down position, if there is no monitoring means likely to cause leakage of the assembly and disassembly of the ground wire phenomenon. The grounding line is a reliable safety measure to protect workers from sudden calls at the work place. Currently, effective measures are to place the grounding fixed end of the primary equipment in the substation and to install the five-prevention device on the fixed end. If the primary equipment of the substation is properly equipped with a ground wire microcomputer anti-misoperation locking device, it can effectively reduce the occurrence of misoperation accidents.
2. The operation of the temporary grounding line (installation and removal) must be incorporated into the normalized management. The operation process must be blocked by the anti-misoperation locking device, that is, simulated and operated by the electronic key memory program to completely reduce It is only because the operator remembers or operates the sequence that it is easy to appear misunderstanding, so that it really operates according to the logic of computer memory, and effectively guarantees that the accident with the grounding line closing power transmission.
Third, the voltage transformer should not be installed on the secondary side of the short-circuit ground wire 1. Some power supply company's maintenance team in the substation on the 10 ~ 500kV voltage transformer repair work, the first work for the transformation of electricity Ticket security measures require that only a grounding isolation switch (knife switch) or grounding wire be installed on the primary side of the voltage transformer, and it is not required to short-circuit the grounding on the secondary side of the voltage transformer. In the course of work, the primary side connection of the voltage transformer is removed, and the maintenance personnel working on the voltage transformer lose the protection of the short-circuit grounding.
2. The short-circuit grounding on the secondary side of the voltage transformer is very important for ensuring the safety of maintenance personnel. Before the overhaul of the voltage transformer, the grounding switch or the grounding wire has been installed on the primary side, and the safety measures such as secondary circuit fuse (insurance) have been withdrawn. But in actual work, after disconnecting the voltage transformer once, it will lose the protection of the short-circuit grounding. When the secondary circuit malfunctions, the voltage transformer will have a reverse voltage on the primary side, endangering the maintenance personnel. Personal safety.
IV. Installation and disassembly of the grounding cable should not be recorded 1. The primary operation equipment installation and removal of the grounding line in this substation is an important operation content. The on-duty personnel did not record clearly on the relevant "Checking tickets is enough, and safety work is guaranteed.
2. The operation of the grounding wire As the main danger point of the electrical switch, avoiding and controlling the dangerous point is an effective method to prevent the occurrence of an electrical misoperation accident. Therefore, the management of the grounding wire is strengthened, that is, the installation and removal of the primary equipment inside. Grounding line is an important operation content. On-duty personnel are clearly recorded in the relevant register in accordance with the relevant regulations, and it is entirely possible to eliminate the occurrence of misoperation accidents.
3. On-duty personnel are clearly recorded in the operation log and the "grounding line operation register" according to the work ticket, installation and removal of grounding wires for work tasks. Before resuming power transmission, it is necessary to first check whether all the tasks in the operation log and register have been completed and whether the grounding line has been completely dismantled and clearly explained during the handover.
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