1. Trial delivery and commissioning method
The first thing to find is the fault of the remaining current action maintainer itself. The detailed operation method is: first block the power supply, and then remove all the zero sequence transformer load side leads of the remaining current action maintainer (the remaining current action maintainer of the second and third levels will directly remove the outgoing line) and then close the maintainer. If the maintainer is still not operational, it is clear that the maintainer itself is faulty and should be repaired or replaced. If it can operate normally, then there is nothing wrong with the maintainer itself, and then look for the switchboard or line. The operation method is: first block the load of each outgoing line or AC contactor, if it cannot be operated, it is clear that there is something wrong with the distribution board, and the electrical, appearance and other equipment should be checked whether the insulation is outstanding and whether the wiring is correct; If it can operate normally, it means that there is no fault on the switchboard. When it is confirmed that the fault occurs on the outer line, the branch line search method can be used to find the fault point.
2 Visual inspection method
The intuitive inspection method is that the inspectors analyze and judge the fault phenomenon, and conduct an intuitive inspection of the maintenance area, including the remaining current action maintainer and the line equipment to be maintained, and then find out the fault points. During the inspection, the inspection should focus on the corners, branches, crossings and other messy sections and fault-prone points of the line. This method is simple and easy to implement and is suitable for finding obvious faults. For example, the wire is broken and the wire is on the ground, the wire is in contact with the wire and the wire is incorrectly wiring, etc.
3 Numerical comparison method
The numerical comparison method is to measure the line or equipment with the help of the surface of the instrument, and compare the measured value with the original value, and then find out the fault. In particular, when the insulation of the neutral wire of the line is reduced or the neutral wire of the equipment is repeatedly grounded, it simply causes the total maintenance to trip frequently, while the secondary maintainer does not trip. When dealing with the tripping of the secondary maintainer, the method of switching the phase wire and the neutral wire should not be adopted to put into operation the secondary maintenance, and the repeated grounding wire of the equipment can be removed.
4-point exclusion method
When checking the fault points of the line, you can disconnect the branches of the low-voltage power grid in accordance with the order of "first backbone, then branch, and then end", and only test the power transmission of the backbone line, if the backbone line is fine, then the backbone line can operate normally. Then, put the branches and then the end into operation. When the maintainer trips when the line is put into operation, the fault point is on the line, and the fault point can be found on this line in a centralized manner
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