Leakage protection, in simple terms, is to cut off the power supply when the leakage current exceeds 30mA within 100 milliseconds. This requires very sensitive and reliable current detection, and the relay is very stable and reliable. In the usual life, there will be many problems. Today, Xiaobian talks about the reasons and solutions for the leakage protector.
1. The fault of the load is leaking;
2. After the leakage protector is protected, the “Reset†button on the panel is not reset.
3. The leakage protector itself has a fault, such as a mechanical trip device failure, electronic control circuit breakdown, and the like.
solution:The first step is to remove the outlet end line of the leakage circuit breaker. If it can be closed, it means that there is a problem with the line. It is necessary to check the line and then eliminate the problem. The second case is not clear that the circuit breaker is damaged and needs to be purchased. replace.
In addition, an overload trip occurred, the circuit breaker was very hot, and it could not be closed at this time. It was necessary to wait for the temperature to drop before operating, and replace the slightly larger circuit breaker.
The following items should be noted during the use of the leakage protection switch:
1. After the leakage protection switch is put into operation, it should consciously establish an operation record and improve the corresponding management system;
2. After the leakage protection switch is put into operation, under the power-on state, press the test button once or twice a month to check whether the leakage protection switch is normal and reliable, especially in the thunderstorm season.
3. Regularly analyze the operation of the leakage protection switch and replace the faulty leakage protection switch in time;
4. The maintenance of the leakage protection switch should be carried out by professionals. If there is any abnormality during operation, it should be handled by an electrician to avoid expanding the scope of the accident;
5, after thunderstorm or other unexplained reasons to make the leakage protection switch action, should be checked and analyzed;
6. After the leakage protection switch is operated, if the cause of the accident is not found after inspection, the test is allowed to be closed once. If it is operated again, the cause should be identified, the fault should be found, and if necessary, the action characteristic test should be carried out, and the power transmission should not be forced continuously. Except that it is confirmed by the inspection that the leakage protection switch itself has failed, it is strictly forbidden to remove the leakage protection switch forcibly sending power;
7. Before the leakage protection switch of the exiting operation is used again, the action characteristic test shall be carried out according to the items specified by the relevant department;
8. The operating characteristics of the leakage protection switch are set by the manufacturer and used according to the product manual.
9. After an accidental electric shock accident occurs within the protection range of the leakage protection switch, the operation of the leakage protection switch should be checked, and the reason for failing to protect the function should be analyzed. The site should be protected before the investigation, and the leakage protection should not be removed. switch;
10. In order to check the operating characteristics and changes of the leakage protection switch during operation, the operational characteristics test should be performed periodically.
The physical structure of L. SYV is 100% polyethylene insulation; Sywv# for physical foam polyethylene insulated cable, foaming rate of 70-80%; L. Due to the dielectric loss, the attenuation of SYV solid cable is significantly greater than that of SYWV physical foam cable; Among the commonly used engineering cables, the physical foam cable is still the best transmission performance, the lowest price of the cable, in video, radio frequency, microwave and other bands are so. The test data given by the manufacturer also shows this; L) Library coaxial cable can be used for DC, RF and microwave frequency bands. Differentiating cables by "RF"/" video "is not only insufficient, but also misleading: it seems that solid cables must or can only be selected for video transmission. ; From an engineering perspective, it is more practical to distinguish between "solid" and "foam" cable types; L The characteristic difference between high braided (128) and low braided (64) cables: Yi Aiyi laboratory experimental research shows that in the following frequency band of 200 KHZ, the "low resistance" of high braided cables plays an important role in the shielding layer, so the low frequency transmission attenuation is less than that of low braided cables. However, in the video, RF and microwave frequencies above 200-300 KHZ, the high braided cable has lost the advantage of "low resistance" due to the "high frequency skin effect", so the two high frequency attenuation cables are basically the same.
LRM200 RF Coaxial cables,LMR400 RF Coaxial Cable,RG58 RF Coaxial Cables,LMR240 Coaxial cables,RG174 Cables
Yetnorson Antenna Co., Ltd. , https://www.xhlantenna.com