Use grounding wire precautions
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First, the grounding wire should not be stored. 1. Because some power supply companies do not pay attention to the management of the grounding line, the grounding wire is neither numbered nor stored, sometimes stacked. When you use it, you can take it casually, and do not check it after use. The grounding of the grounding line caused by the grounding of the grounding line has occurred frequently. Article 82 of the Safety Regulations has clearly stated that each set of grounding wires shall be numbered and stored at a fixed location. The storage location should also be numbered, and the grounding wire number and storage location number must be the same. The grounding line number is required for both the operating ticket and the work ticket system. Some substations on duty personnel are not strong in safety awareness. They think that the number of grounding lines in the substation is not very large, and the probability of accidents is very low and the management work is lax. It is too troublesome to store the number, but does not pay attention to the numbering management of the grounding line.
2. The operation of the grounding wire is mostly temporary, which is very likely to cause omissions, and misconnection and leakage of the grounding wire will bring great harm. The grounding wire should be numbered and stored in a fixed number position. It can be used according to the number when handling the work ticket and using the operating ticket. It can reflect the use of the grounding wire of the company in the course of each operation of the substation. The actual amount of storage can be seen at a glance by checking the fixed storage point, so as to prevent the occurrence of a vicious accident with the grounding line for power transmission due to the leakage of the grounding wire.
Second, the grounding end should not use the grounding pile with the microcomputer five-proof device 1. In the primary equipment maintenance of the substation, to ensure the personal safety of the staff to install a temporary grounding wire, the grounding is generally used to receive the equipment The grounding of the frame leads to the position of the line. If there is no monitoring means, it is easy to cause the grounding and disconnection of the grounding line. The grounding wire is a reliable safety measure to protect the staff from sudden calls at the working place. The current effective measures are to set the grounding fixed end of the equipment in the substation and install the microcomputer five-proof device at the fixed end. If the grounding line microcomputer anti-misoperation locking device is properly installed in the primary equipment of the substation, the occurrence of misoperation accidents can be effectively reduced.
2. In order to make the operation (installation and disassembly) of the temporary grounding wire into the standardized management, the operation process must be blocked by the anti-missing device, that is, the simulation and operation through the electronic key memory program, completely reduce It is only because of the operator's memory or operation sequence operation that it is easy to leak and misconnect, so that it can be operated according to the logic of computer memory, and it is guaranteed to prevent the occurrence of power transmission accidents with grounding.
Third, the secondary side of the voltage transformer should not be equipped with a short-circuited ground wire 1. Some power supply company's maintenance team in the substation to repair the 10 to 500kV voltage transformer, the first work of the substation The ticket safety measure requires that the grounding isolating switch (knife gate) or the grounding wire be installed on the primary side of the voltage transformer. It is not required to short-circuit the grounding on the secondary side of the voltage transformer. In 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 short-circuit grounding protection.
2. Short-circuit grounding on the secondary side of the voltage transformer is essential to ensure the personal safety of the maintenance personnel. Before the voltage transformer was repaired, the grounding knife was closed or the grounding wire was installed on the primary side, and the secondary circuit fuse (insurance) and other safety measures were withdrawn. However, in actual work, after disconnecting the voltage transformer once, it will lose the protection of short-circuit grounding. When the secondary circuit malfunctions, the primary side of the voltage transformer will have a reverse voltage, which will endanger the maintenance personnel. Personal safety.
4. Installation and dismantling of the grounding wire should not be recorded. 1. The important operation content of the installation and removal of the grounding wire in the substation. The on-duty personnel did not record clearly in the relevant register according to the relevant regulations. Tickets are enough to check, and safe work is guaranteed.
2. The operation of the grounding wire is the main dangerous point of electrical switching. Avoiding and controlling the dangerous point is an effective method to prevent electrical accidents. Therefore, the management of the grounding wire is strengthened, that is, the installation and removal of the primary equipment. The important operation content of the grounding wire, the on-duty personnel record clearly in the relevant register according to the relevant regulations, can completely prevent the occurrence of misoperation accidents.
3. On-duty personnel shall clearly record in the operation log and the “Grounding Line Operation Register†according to the work ticket, work task installation and removal of the grounding wire. Before resuming power transmission, you should first check whether the work tasks in the operation log and the registration book have all been completed, whether the grounding wire has been completely removed, and clarify it when handing over the shift.