Very few dual power automatic switching devices of the main circuit switching equipment selection Parameter Description 1. Power grounding type are TN-C system TN-C system, the function of a combination of neutral and protective conductors in a conductor, dual power the number of poles of the main circuit switching device automatically switches off the electrical power cord only. That AC single-phase two-wire unipolar; AC two-phase three-wire system with bipolar; AC three-phase four-wire three-pole; TN-C current system leads to L + and unipolar switches PEN (dc) when off L +; TN- DC system uses C leads to L +, L- and PEN (dc) when bipolar switch L +, L-. 2. Power grounding type are TN-S system TN-S system, the use of a separate protective conductor. If the neutral ground of two power supplies are always grounded by the same bus ground. When the installation of the leakage current operated protective devices, they should be able to protect the circuit disconnect all live conductors. 3. Power grounding type TN-S system, respectively, and TT systems TT power system has a direct ground, exposed conductive parts of the device can be grounded through the ground, the ground electrode is electrically grounded power supply system independent of the pole, so the number of poles selected dual power automatic switching device main circuit breaker must cut all electrical power cord. 4. Power grounding type TN-S systems are IT systems and IT power system for all live parts are isolated from the ground, or is there a point by impedance ground exposed conductive parts dual power supplies, electrical installations or independent ground or concentrated connected to system ground. 5. Intelligent dual power between the two devices is such a reliable way power switch, in order to ensure the supply of equipment. When the common power anomalies, intelligent dual-supply device can automatically switch to standby power, intelligent dual-supply device consists of two parts of the switch body and the controller. Switch body motor control used by the power switching circuit breaker by mechanical interlocking mechanism and backup power circuit breaker, and then control the power switch. Controller for voltage sampling to determine whether the abnormal power, if there is an exception should produce a corresponding switching. Dual power automatic transfer switch (ATSE) the development trend of the development trend of ATSE includes two aspects, one is the switch body Schneider dual power, with high surge current capability, and can frequently transfer; with reliable mechanical interlock to ensure that any state can not run in parallel two-way power; large distance function with 0, and isolation, in order to be able to withstand; allowed to jump off with a fuse or device to prevent dual power switch due to overload caused by the output of non-electrical phenomena the impact of higher voltage (8KV) above; after four switches with N-stage before-minute feature to prevent ATSE when switching, different systems N line potential shift so that the current trend is inconsistent or shunt, resulting in residual current protection equipment malfunction. The second is the controller, using microprocessor intelligent products, detection module should have a high detection accuracy and a wide range of parameter settings, including voltage, frequency, delay time; with good electromagnetic compatibility, should be able to withstand voltage fluctuations in the main circuit, surge protection, harmonic interference and electromagnetic interference; conversion time soon, and the time delay is adjustable; can provide users with a variety of signals and fire linkage interface, communication interface. As can be seen from the ATSE development process and development trends, PC-ATSE application in engineering will become mainstream. It is worth mentioning is that the "fixed fire pump drive - Controller" (IEC standard draft amendments) pointed out that the end of the dual power, ATSE should not short-circuit and over-current protection. The CB-ATSE ABB can not meet this dual power, once the short-circuit and over-current occurs, release the trip, although the supply side caused by electricity, but no electricity load, can not meet the primary and secondary load on supply requirements. IEC standard revision trend also proved PC-ATSE promotion project is inevitable. That is why we were alone on the PC level ATSE reasons set forth herein. ABB dual power dual power _ _ Thai Industries ended only by the Thai Industrial Co., Ltd. Shanghai Branch Yueqing offer. Shanghai only Thai Industrial Co., Ltd. Yueqing Branch (www.cnats.cc) strong, credible, in Wenzhou, Zhejiang switch industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead only Thai Industries and you hand into the brilliant, for a better future!