Technical measures to ensure safety during the hot

2022-10-04
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Technical measures to ensure safety during power outage maintenance work

in the maintenance work, the staff should clarify the work task, work scope, safety measures, live parts and other safety precautions. The person in charge of the work must always stay at the work site, carefully monitor the safety of the staff, and remind the staff to pay attention to safety at any time. For the work that needs to be supervised, such as the maintenance work without power failure and some maintenance work without power failure, a special person shall be appointed to supervise it. The guardian shall be responsible and concentrate, and remind the staff of the matters needing attention at any time to prevent possible accidents. The following steps should be taken to extend the service life of parts and components to ensure safety in the maintenance work of total power failure and partial power failure:

(1) the zigzag loading of the zigzag Charpy sample of the power failure cantilever adopts the weight loading condition. In the maintenance work, if the distance between the human body and other live equipment is small, the distance between 10 kV and below is less than 0.35 meters, and the distance between 20 ~ 35 kV is less than 0.6 meters, the equipment should be powered off. If the distance is greater than the above values, However, when it is less than 0.7 m and 1 m respectively, a barrier should be set, otherwise the power should also be cut off. In case of power failure, it should be noted that all lines that can send power to the maintenance part should be cut off, and measures to prevent false closing should be taken, and there should be at least one obvious disconnection point at each place. For multi circuit lines, attention should be paid to prevent sudden calls from other aspects, especially to prevent reverse power transmission in low voltage

(2) the purpose of discharge is to eliminate the residual static electricity on the repaired equipment. The discharge shall be conducted with special wires and operated with insulating rods or switches. Hands shall not be in contact with the discharge conductor. Pay attention to the discharge between wires and ground and between wires. There are many residual charges in capacitors and cables, so it is best to have special discharge equipment

(3) power verification for the lines or equipment that have been powered off, regardless of whether the voltmeter or other signals normally connected to it indicate that there is no power, power verification should be carried out. When checking electricity, the corresponding electroscope should be selected according to the voltage level

(4) after the test of installing temporary grounding wire, the curve can be called out again. In order to prevent accidental power transmission and accidental reverse power transmission of secondary system, and to eliminate induced electricity in other aspects, necessary temporary grounding wire should be installed at the outer end of the repaired part. The installation and removal sequence of the temporary grounding wire must not be wrong. The grounding terminal shall be connected first during installation and then removed after removal

(5) install a barrier. When part of the power is cut off for maintenance, the live part should be blocked to keep a certain distance between the maintenance staff and the live conductor

(6) the function of hanging the signboard is to remind people to understand the type of strain curve of the tensile testing machine. For example, in an economic cooperation room, power can be sent to the switch of the equipment to be repaired, and a sign that someone is working and switching on is prohibited should be hung; Signs of stop and high voltage danger should be hung on the barriers near the live parts

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