In the operation of the high-voltage drop-type fuse , due to the single-phase operation of the insulating rod, no load operation is allowed. In practice, you will find that most of the situations when the first phase is pulled out with the load is similar to the disconnection of the parallel circuit or the loop, and the disconnection voltage is low, and therefore, no strong arc occurs. When the second phase is pulled with the load, because the fracture voltage is the line voltage, the fracture voltage is high, so a strong arc may occur, and an arc short circuit may occur in adjacent phases, which will threaten the safety of the human body and equipment. When the third phase is pulled open, no arc occurs because the circuit is already open (no current or very small current). Therefore, reasonable and correct operation of high-voltage fuses is related to personal safety and circuit safety.
Summarize several methods in practical experience and give them a reference:
First, prepare before operation: Do a good job of preparatory work before the operation, select the appropriate voltage level and qualified insulating rod, wear insulating gloves, wear insulated shoes, to ensure safety;
Second, the operation of the check: Before operation, carefully check the device name and number, to determine the correctness of the operation object;
Third, the operation of the station: choose to facilitate the location of the station is good, generally standing in front of the current operating phase drop-type fuse is appropriate, if it is the operation of the tower, but also a good seat belt;
Fourth, the alignment of operation: During the operation, the high voltage fuse moving contact is aligned with its static contact to ensure the accuracy of the combined position;
5. All-in-one closing: In the case of high-voltage drop-type fuses, they must be rapid, decisive, and accurate, but they must not be used too hard to prevent damage to supporting insulators and other equipment.
In addition: high-voltage drop-type fuses in the daily operation of the current characteristics of the fuse parts are unstable, with the operating environment, temperature changes, resulting in mismatches, multi-level tripping and other phenomena; poor quality of the fusion tube, deformation occurs Layers lead to false fall; long-term use is prone to contact with the upper and lower contacts, easily lead to hot hair, burning and contact oxidation; due to improper operation, use, and installation in operation and maintenance, resulting in damage to its performance. Should improve monitoring in this area.
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