Under normal circumstances, load operation is not allowed only to operate no-load equipment (line), but in the rural power grid 10kV distribution line branch line and rated capacity of less than 200kVA distribution transformers can be carried out the following load operation:
1, the operation is carried out by two people (one person to monitor, one person to operate), but must wear qualified insulation gloves, wear insulation boots, wear protective glasses, use the voltage level of qualified insulation rod operation, prohibited in lightning or heavy rain climate.
2, in the high-voltage fuse pull operation, it is generally stipulated that the middle phase is broken first, and then the leeward side phase, and then the windward side phase. This is because the distribution transformer is changed from three-phase operation to two-phase operation, and the arc spark generated when pulling off the intermediate phase is small, which will not cause short-circuit between phases. The second is to pull off the leeward side phase, because the middle phase has been pulled apart, the distance between the leeward side phase and the windward side phase has doubled, even if there is an overvoltage, the possibility of short-circuit between the phases is very small, after pulling off the windward side phase, only the capacitor current of the distribution transformer to the ground, the electrical spark generated is very slight.
3, when closing the first windward side phase, and then close the lee side phase, this is because the middle phase is not closed, the distance between phases is large, even if the possibility of a large arc caused by the short circuit between phases is also very small after closing the middle phase, only the distribution of two-phase operation into three phase operation, the electrical spark generated is very small, there will be no abnormal problems.
4, the operation of high voltage current limiting fuse is a frequent project, can not be noticed will cause contact burns caused by burrs poor contact, so that the contact overheat, spring annealing, to promote contact more bad contact, so forming a vicious cycle, so pull, close the fuse do not force too hard, after closing, to carefully check the duck mouth tongue can tightly buckle the tongue length of more than two-thirds, The brake rod can be hooked on the duck's mouth to press down a few times, and then gently try to pull, check whether it is good. When the closing is not in place or not firmly fastened, the static contact pressure on the fuse is insufficient, which is easy to cause the contact burn or the welding tube to fall by mistake.
