The fault arc circuit breaker comprises a general structure of an operating mechanism, a contact system, a tripping mechanism, a test button, a terminal, a frame, and the like, and the characteristic structure further comprises an arc detecting circuit and an arc fault electronic identification circuit (including a microprocessor), Based on PCB hardware and preset protection algorithms, intelligent arc detection and fault arc recognition are realized.
The process of protection of the fault arc breaker: (1) arc detection. The arc in the circuit is monitored by advanced electronics. (2) Identification of arc characteristics. For the detected arc, analyze its characteristics and identify whether it is a fault arc. In the manufacture of fault arc breakers, hundreds of possible operating conditions are tested and programmed into the arc characteristic filter to identify "normal" and "dangerous" arcs. (3) Protection characteristic matching analysis. The protection characteristics meet the requirements of UL1699: On the AC power supply line, when the fault arc breaker detects 8 half-cycle fault arcs within 0.5s, the fault arc breaker performs the trip-off circuit, and the trip time should be less than 0.2. s. (4) Cut off the circuit to achieve fault protection. When the arc fault protection characteristic is satisfied, a trip signal is issued to cut off the circuit.
The fault arc circuit detects the fault arc, and is analyzed by the protection algorithm to trigger the trip when the protection characteristic is satisfied. Typical method: detecting the load current, amplifying and transmitting the current signal to the arc characteristic filter to determine whether the current signal frequency is greater than the power supply frequency and less than the power line communication frequency. The signal output by the filter is compared with the set arc current threshold value, and the accumulator is added when the current threshold is greater than the current threshold. The fault arc breaker periodically checks the output of the accumulator, and when the threshold is exceeded, the trip is triggered.
Fault arc breakers are used in conjunction with GFCI (Ground Fault Leakage Circuit Breaker) (or RCCB (Residual Current Circuit Breaker)) to provide both home and electrical fault protection for both arc and leakage fault protection, usually fault arc breakers. - GFCI socket mode. EATON Corporation of the United States has developed an end product that integrates ground fault (leakage) protection in the fault arc-breaker housing.
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