How to use the leakage current clamp meter check line leakage or theft
Check the user's internal lines and equipment without leakage into the family line in the power of the user with leakage current clamp meter measuring the leakage current value, while the electricity equipment, lighting one by one into exit, to find the leakage through the leakage current clamp meter to measure the current oversight of the changes in the value of the equipment or if the equipment and lighting; all the lights are normal, or the existence of leakage of equipment have quit, but the leakage current clamp meter to display the user still has leakage current, low voltage line is likely the user exists leakage, should be considered to deal with the specific circumstances. For the buried buried pipeline leakage fault, we can only take the method of changing line or rewiring.
Determine the position of leakage after determining the phase line of leakageIn the distribution transformer, line to check plug fuse core, fuse the neutral line and the rest of the two are disconnected, the pole with leakage current clamp meter to measure the charged phase judging leakage location. In order to improve the efficiency, the rod position is optional in the middle of the line, and the leakage position is detected in the first half or the second half of the line, and then it is detected in the circuit section where the leakage is suspected. And so on, narrow the detection range. Finally, the less certain scope of the line insulators were detected, and the range in the phase of the user within the next phase lines were detected (on the ground, but also in the detection of insulators at the same time), to determine the specific location of leakage.Transmission in low voltage line, and also can be used to determine the suspected low pressure within the scope of users connecting line leakage current clamp meter detection. When detecting, phase and single-phase neutral line to users at the same time put in the leakage flow table clamp jaw; user three three-phase line and neutral line should also put in the jaw. If there is no leakage fault, then the phase load current flux and zero leakage current clamp meter display value is zero; if leakage current, can detect the leakage current value.
In the distribution transformer, AC contactor will control the neutral line of low voltage line outlet side is disconnected, and then remove the fuse core is installed on one phase, with leakage current clamp meter to measure the phase display measured value is the phase of leakage current. In the same way, the leakage current values of the remaining phases are measured in turn.In order to prevent the existence of phase grounding line (such as a line and a local law by stealing etc.) occurred in large current damage detection instrument, when the leakage current clamp meter gear on the maximum range; if the display value is very small, then the leakage current clamp meter range conversion to Ma block measurement.
Determine whether the residual current action protector itself is defectiveIf the residual current action protector can not be put into operation or frequent protection: at the distribution transformerLeakage current clamp meterThree line and neutral line around the AC contactor or leakage breaker outlet side of the reactor will be forced into the residual current protection, if the leakage current clamp meter is greater than 300mA, it proved that the residual current protection device is good, then the application of leakage current clamp meter to determine which phase leakage; otherwise we should repair or replace the residual current protection device.
