토론 on 신청 of 누설 전류 클램프 미터
1 판단 여부 거기 문제 잔여 전류 작동 보호자 자체
If the residual current action protector cannot be put into operation or is frequently protected: at the distribution transformer, use a leakage current clamp meter to clamp the three phase wires and neutral wires on the outlet side of the AC contactor or leakage circuit breaker, and activate the residual current The protector is forcibly put into operation. 만약 그 디스플레이 값 의 누설 전류 클램프 미터 is greater than 300mA at this time, it proves that the residual current action protector is good. At this time, use the leakage current clamp meter to judge which phase is leaking; otherwise , it should be repaired Or replace the residual current operating protector.
2. 결정 어느 위상 및 위상 라인 있음 누출
At the distribution transformer, disconnect the neutral line on 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, and measure the phase with a leakage current clamp meter. , the measured display value is the leakage current value of the phase. Measure the leakage current values of the other phases sequentially in the same way.
3 후 결정 그 위상 선 with 누설, 결정 그의 위치 의 누설
In the case of low-voltage line power transmission, the leakage current clamp meter for the low-voltage subscriber line within the suspected range can also be detected. When testing, the phase wire and neutral wire of single-phase users should be placed in the jaws of the leakage current clamp meter at the same time; the three phase wires and neutral wires of three-phase users should also be put into the jaws at the 동일 시간. If there is no leakage fault, the phasor sum of the load current magnetic flux is zero, and the display value of the leakage current clamp meter is also zero; if there is a leakage current, the value of the leakage current can be detected.
4 Check the user's internal lines and equipment for leakage
Use a leakage current clamp meter to measure the leakage current value at the user's power inlet line, and at the same time put the user's electrical equipment and lamps into and out one by one, and find the leakage current by looking at the change of the leakage current value measured by the leakage current clamp meter If all the equipment and lamps are normal, or the equipment with leakage has been withdrawn, but the leakage current clamp meter shows that the user still has leakage current, it may be that the low-voltage line of the user has leakage. It should be dealt with on a case-by-case basis. For the leakage fault of the pre-buried and concealed pipeline, only the treatment method of changing the line or rewiring can be adopted.
5 issues to be aware of
5.1 언제 찾고 for 누설 faults, the AC contactor controlling the low-voltage line needs to be forced to send power for a short time.
5.2 Pay attention to safety when looking for leakage faults, someone must supervise and take safety measures. When reading the data of the leakage current clamp meter, be sure to keep the maximum distance between the human body and the live parts. It is best to use the HOLD (data hold) function on the leakage current clamp meter.
5.3 고차 고조파 간섭 작음 숫자 of 잔류 전류 작동 보호기 % 2c 할 수 있습니다 원인 그들 to 오작동. If there are large harmonic source users such as intermediate frequency furnaces in the station area, such users should be temporarily withdrawaln from operation during detection.
5.4 The use of leakage current clamp meters is particularly effective in finding "one line, one place" 전기 도둑질 가구. Its characteristic is that the leakage current clamp meters display large values, reaching hundreds of milliamperes or even several amperes. Unknown electricity stealers can be searched according to the above method, and those suspected of such electricity stealing can go directly to their household 전선 체크 A 누설 전류 클램프 미터.
