Leakage protector switch function and significance
Some experimental studies have shown that 80% of the human body's electric shock is caused by the single-phase phase line. Through the phase line, the human body and the earth, the electric current will form a loop among the three. May cause harm to the human body. Why should we promote the use of leakage protection switches? Leakage protection switches have obvious effects on reducing human body electric shock, preventing leakage, preventing electric shock, and preventing equipment leakage. The leakage protection switch produced by the general manufacturer has the functions of leakage protection and short circuit, and some have the advantages of protection, such as overload, undervoltage and overvoltage.
Optional leakage protector switch - in line with national technical standards
At present, the leakage protector sold on the market can be described as a mixed product. The quality of the products is different. When we purchase, we must pay attention to whether the product has passed the national standard GB6829-86 "Leakage Current Action Protector". This parameter can be used again. The manufacturer's product manual can be found in the general format: “Through the China Electrotechnical Products Certification Committee safety certification, certificate number:******, in line with the standard: BG6829-86†If the word can not be found in the manual, it must be do not buy.
Leakage protector switch—rated current, overcurrent release rated current mainstream leakage protector has more rated current specifications, but the overcurrent release rated current is only 10A, 16A, 20A, when purchasing Note that the AC power is 220V working voltage, the user can roughly calculate the rated current of the leakage protector according to the current of 1Aw load 5A. Normally, the rated current value of the overcurrent release can be determined according to the rated current value of 0.85 to 0.9 times.
Chint leakage protection switch DZ158LE-100 series C100 Household C-type air switch, compact design, good current limiting characteristics, greatly reducing the impact of faults on the system and equipment, improving safety and electrical life. Reference price: 102.5 yuan / month.
(Chengtai leakage protection switch and other products comparison)
Leakage protector switch use precautions
(1) Leakage protector is suitable for low-voltage power distribution system where the neutral point of the power supply is directly grounded or through the grounding of resistance and reactance. For systems where the neutral point of the power supply is not grounded, it is not advisable to use a leakage protector. Because the latter cannot constitute a leakage electrical circuit, even if a ground fault occurs, a rated operating current greater than or equal to the leakage protector is generated, the protector cannot be operated to cut off the power supply circuit in time; or the human body approaches the fault point to form a leakage electrical circuit. The leakage protector is activated to cut off the power circuit. However, this is still not safe for the human body. Obviously, it is necessary to have the condition of the grounding device. When the electrical equipment leaks and the leakage current reaches the operating current, it can immediately trip within 0.1 seconds, and the main circuit of the power supply is cut off.
(2) The working neutral line N of the leakage protector protection line must pass the zero-sequence current transformer. Otherwise, after switching on, there will be an unbalanced current that will cause the leakage protector to malfunction.
(3) The zero-protection line (PE) is not allowed to pass the zero-sequence current transformer. Because the protection circuit (PE) passes through the zero-sequence current transformer, the leakage current flows back through the zero-sequence current transformer through the PE protection line, causing the current to cancel, and the leakage current value is not detected on the transformer. In the event of a fault, the leakage protector does not operate and does not provide protection.
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