Discussion on four current situations of the use a

2022-09-26
  • Detail

Discussion on four current situations of the use and management of grounding wire

grounding wire is the lifeline to ensure the personal safety of workers. The operation of installing and disassembling grounding wire is a more dangerous operation in electrical operation. Once an accident occurs, it will have a great impact and serious consequences. It is not uncommon for the power system to be electrified with grounding wire or grounding wire, and it is listed as one of the malignant misoperation accidents. At the same time, it is also the main source of human equipment accidents and personal casualties. To ensure the correctness of the installation and removal of grounding wires is an important work for the safe and reliable operation of the substation. To put an end to the occurrence of man-made accidents, we must standardize management, start from the subtle, and jointly check at multiple levels. Make sure everyone starts from me, starts from the side, and truly values safety from the heart, so as to promote the safe production of the enterprise

1 should grounding wires be stored by number?

because some power supply companies' substations do not pay attention to the management of grounding wires, grounding wires are neither numbered nor stored at fixed points, and sometimes they are stacked together. Take it casually when in use, and do not check it after use, but omit to remove the grounding wire, resulting in frequent power transmission accidents with grounding wire. Article 82 of the safety regulations clearly stipulates that each group of grounding wires should be numbered and stored in a fixed place. The storage location should also be numbered, and the number of grounding wire must be consistent with the number of storage location. The operation ticket and work ticket system require the number of grounding wire. Some substation personnel on duty do not have a strong sense of safety. They think that the number of grounding wires in the substation is not many, the probability of accidents is very low, and the management work is lax. They don't think it's troublesome to store the numbers, and they don't pay attention to the numbering management of grounding wires

the operation of grounding wire is mostly temporary, which is very easy to cause omission and negligence, and the wrong connection and missing removal of grounding wire will bring great harm. The grounding wire shall be numbered and stored in the position with fixed number. It shall be used according to the number when handling the work ticket and using the operation ticket, which can timely reflect the use and actual consumption of the grounding wire of the substation during each operation task of the substation. It can be seen at a glance by checking the fixed storage point, so as to prevent the malignant accident of power transmission with grounding wire due to missing removal of grounding wire

2 should the grounding pile with microcomputer five prevention device be used at the grounding end?

during the primary equipment maintenance of the substation, temporary grounding wires should be installed to ensure the personal safety of workers. Generally, the grounding is connected to the position of the grounding downlead of the equipment frame. If there is no monitoring means, it is easy to cause the phenomenon of missing the installation and removal of grounding wires. The grounding wire is a reliable safety measure to protect workers from sudden calls at the workplace. At present, the effective measure is to set a fixed grounding terminal at the primary equipment of the substation, and install a microcomputer five prevention device at the fixed terminal. If the primary equipment of the substation is properly installed with the microcomputer anti misoperation locking device of the grounding wire, the occurrence of misoperation accidents can be effectively reduced

however, the manufacturing cost of the alternating experimental box is high. It is necessary to bring the operation (assembly and disassembly) of the temporary grounding wire into the standardized management. After the operation 5) after the copper wire mesh is removed from the barrel, it must be locked by the error proof locking device, that is, it must be simulated and operated by the memory program of the electronic key, so as to completely reduce the phenomenon of missing disassembly and incorrect connection that is easy to occur only by the memory of the operator or the operation sequence, Make it operate according to the logic memorized by the computer, so as to effectively prevent the occurrence of power transmission accident with ground wire

3 should a short-circuit ground wire be installed on the secondary side of the voltage transformer

the maintenance teams of some power supply companies can be roughly summarized into two points in the substation: when the substation is overhauling the 10 ~ 500kV voltage transformer, the first type of work ticket security measures required for the substation is only to close the grounding disconnector (knife switch) or install the grounding wire on the primary side of the voltage transformer, and there is no requirement to short-circuit grounding on the secondary side of the voltage transformer. During the working process, the primary side wiring of the voltage transformer is removed, so that the maintenance personnel working in the voltage transformer lose the protection of short-circuit grounding

the short-circuit grounding of the secondary side of voltage transformer is very important to ensure the personal safety of maintenance personnel. Although the grounding knife switch has been closed or the grounding wire has been installed on the primary side of the voltage transformer before maintenance, and the secondary circuit fuse (safety) and other safety measures have been withdrawn. However, in actual work, after the primary wiring of the voltage transformer is disconnected, it will lose the protection of short-circuit grounding. When the secondary circuit is misoperated, there will be reverse voltage rise on the primary side of the voltage transformer, endangering the personal safety of maintenance personnel

4 should the installation and removal of grounding wires be recorded?

the important operation content of the installation and removal of grounding wires of primary equipment in the substation is not clearly recorded in the relevant register by the personnel on duty according to the provisions of the relevant regulations, and they think that two checks are enough, and the safety work is guaranteed

the operation of grounding wire is the main dangerous point of electrical switching. Avoiding and controlling the dangerous point is an effective method to prevent electrical misoperation accidents. Therefore, strengthening the management of grounding wire, that is, the installation and removal of grounding wire for primary equipment in the station, which is an important operation content, can completely prevent the occurrence of misoperation accidents if the personnel on duty record it clearly in the relevant register according to the provisions of relevant regulations

the personnel on duty shall install and remove the grounding wire according to the work ticket and work task in the operation log and the grounding wire operation register 2. The fabric in contact with the fixture shall be reinforced with curing adhesive Clearly recorded on. Before resuming power transmission, first check whether the work tasks in the operation log and register have been completed and whether the grounding wires have been removed, and explain them clearly at the time of shift handover

Copyright © 2011 JIN SHI