We all know that if the balloon leaks, it will be flattened and cannot be used anymore. 

We can still use it by filling in that piece, but we need to first find out where the leak is. 

So what should we do if the pneumatic hoist leaks? We also need to first find out where the air leak is. 

Today, the editor will give you some clever tips.

The intuitive inspection method allows inspectors to analyze and judge the fault phenomenon, and visually inspect the protected area, including leakage protectors and protected line equipment, in order to identify the fault point. 

During the inspection, emphasis should be placed on inspecting complex sections such as corners, branches, and intersections of the line, as well as points prone to faults. 

Simple and easy to operate, suitable for finding obvious fault points, such as wire breakage, wire contact, and incorrect wiring.

The trial operation method involves first cutting off the power supply, then removing all the load side leads of the zero sequence transformer of the leakage protector, and then connecting the power supply. 

If the protector still cannot be put into operation, it is a fault of the leakage protector itself and should be replaced or repaired. 

If it can operate normally, there is no fault with the protector, and then investigate whether the fault occurred in the distribution board or on an external line. 

The specific operation method is to first cut off the power supply on the load side of each outgoing line or AC contactor. 

If it cannot operate, it is a fault on the distribution board. 

Electrical and instrument equipment of each circuit should be checked for good insulation and correct wiring. 

If it can operate normally, it indicates that there is no fault on the distribution board. 

After confirming that the fault occurred on the external line, the fault point can be identified using the split line elimination method.

When the fault point is confirmed to have occurred on the external line, the branch lines of the low-voltage power grid can be disconnected in the order of "main line first, then branch, and then end", and only the main line can be tested for power transmission. 

If there is no fault on the main line, then the main line can operate normally. 

Then, put the branch and end into operation. 

When a line is put into operation, the protector acts, and the fault point is located on that line, which can be centrally searched for.

Numerical comparison method, using instruments to measure circuits or equipment, and comparing the measured values with the original values to identify the fault point. 

It should be noted that when the insulation of the neutral line of the line decreases or the neutral line of the equipment is repeatedly grounded, it is easy to cause frequent tripping of the overall protection, while the secondary protection device does not trip. 

When solving the tripping of the secondary protector, the method of switching the phase line and neutral line should not be adopted to put the secondary protector into operation. 

The equipment should be promptly removed from the repeated grounding wire.