Clamp-on ammeter for electricity theft and leakage checks
Clamp ammeter is the most practical electrician's tool for measuring low-voltage lines, high precision and good stability performance are its main features. Power staff can be used to detect low-voltage current, micro-current and check equipment leakage, test the main line whether the power theft. This article introduces the clamp-on ammeter to check power theft leakage detection
Check line internal and equipment with or without power leakage
In the main line with a clamp-on ammeter to measure the leakage current, and then the power equipment will be closed in turn, each closed with a clamp-on ammeter to detect changes in the line leakage current to find the leakage equipment. If all the electrical equipment has been closed, but the clamp-on ammeter shows that there is still leakage current, should be the existence of low-voltage line leakage, should be re-exchanged or leakage detection points
Determine which phase of the phase line leakage
In the distribution transformer, disconnect the neutral line on the contactor side of the low-voltage line, take out the fuse and install it in one of the phase lines, and use the clamp-on ammeter to measure the phase, and the measured current is the leakage current of the phase. Test the leakage current of other phase lines in turn
Determine the location of the leakage
In the case of low-voltage lines energized, the detection of single-phase line and the neutral line should be placed in the jaws of the clamp-on ammeter at the same time, three-phase three-phase line and the neutral line should also be placed into the jaws at the same time. If there is no leakage fault, then the load current flux of the phase and zero, clamp ammeter indication is also zero; such as leakage current, the clamp ammeter can detect leakage current to.
Caution:
Find leakage faults should pay attention to safety, to maintain a safe distance between the human body and the electrified parts.
The fire wire, zero line clamped together that is to measure the leakage current of electrical equipment. (Need to pay attention to 2)
Ground line clamped to measure the leakage current of the grounding line of electrical equipment. (Need to pay attention to a single)
Clamp the three-phase four wires together to test the total leakage current. (4 wires)
Clamp the main line to measure the current of the main line. (Note that the single)
