dummy load manufacturer is a good tool to check low-voltage line leakage or power theft.
1. Determine whether the residual current action protector itself has a problem
If the residual current action protector is not put into operation or frequently protected: At the distribution transformer, the dummy load manufacturer clamps three phase lines and neutral lines on the AC contactor or the leakage circuit breaker outlet side, and the residual current operation protector is forcibly put into operation. If the dummy load manufacturer displays a value greater than 300mA, Then it is proved that the residual current action protector is good. In this case, the dummy load manufacturer is used to determine which phase leakage occurs. Otherwise, repair or replace the remaining current action protector.
2, judge which phase line leakage
At the distribution transformer, disconnect the neutral line at the outlet side of the AC contactor that controls the low-voltage line, and then install the removed fuse core on one of the phases. Use the dummy load manufacturer to measure the phase. The measured display value is the leakage current value of the phase. The leakage current values of the other phases are measured by the same method.
In order to prevent the instrument from being damaged by large current when there is phase-line grounding on the line (for example, some people use the first-to-ground method to steal electricity, etc.), the dummy load manufacturer gear is placed at the largest range first during detection. If the display value is small, then switch the dummy load manufacturer to milliampere measurement.
3. Determine the position of leakage after determining the phase line of leakage
At the distribution transformer, the phase line to be checked is plugged into the fuse core, and the neutral line and the fuses of the other two phases are disconnected. The dummy load manufacturer is used to measure the live phase line to determine the leakage position. In order to improve efficiency, the pole position can be selected in the middle of the line, through the detection of the leakage site in the first half or the second half of the line, and then to the suspected leakage detection of the line segment. And so on to narrow down the detection range. * After that, test the pillar insulators of the phase line within a certain small range, and test the phase line of the user access line connected to the phase line within the range (either on the ground or at the same time when testing the insulator) to determine the specific part of the leakage.
In the case of low-voltage line power supply, the dummy load manufacturer can also be used to test the low-voltage subscriber access line within the suspected range. During detection, the phase line and neutral line of single-phase user should be placed in the jaws of the dummy load manufacturer at the same time. Three phase wires and neutral wires for three-phase users should also be placed into the jaws at the same time. If there is no leakage fault, then the phasor sum of load current flux is zero, and the display value of dummy load manufacturer is zero. If there is leakage current, the leakage current value can be detected.
4, check the user's internal lines and equipment for leakage
dummy load manufacturer is used to measure leakage current value at the user's power supply inlet line. Meanwhile, the user's electrical equipment and lamps are put in and out one by one. We can find leakage devices or lamps by looking at the changes of leakage current manufacturer measured by dummy load. If all the devices and lamps are normal, or the devices with leakage have been withdrawn, but the dummy load manufacturer shows that there is still leakage current in the user. It may be that the low-voltage line of the user has leakage. Processing should be based on specific circumstances. For embedded dark compress pipeline leakage fault, can only take the line change or rewiring method.
dummy load manufacturer https://www.cenrf.com/Dummy-Load