Dual power automatic transfer switch zero line connection are the following: 1. The four-pole dual power automatic transfer switch, zero (N) line alone apart, each connected to common power and standby power grid zero (N) line. 2. The three-pole double power automatic transfer switch zero line connection has two kinds: one is the common power supply and backup power zero (N) line individually separated. Another is a common power supply and backup power with zero line connectivity. When the common power supply and backup power zero line connectivity together, common power lines or backup power lines, installation of residual current operated circuit breaker can not be dual power automatic transfer switch level, otherwise the dual power automatic transfer switch conversion time, residual current operated circuit breaker will automatically trip. High inductive load switching control Attention ATSE is generally not allowed to bring large motors or high inductive load switching, such as large motor load switching in operation, the power phase will be a huge gap between the large mechanical stress . Meanwhile back EMF generated by the motor over-current caused even cause a blown fuse or circuit breaker tripped. Product certification briefing China from May 1, 2002 to begin the implementation of low-voltage electrical products 3C certification, due to ATSE national standards GB / T14048.11-2002 "Automatic Transfer Switching Equipment" in October 2002 release of dual power supply units, 2003 Implementation began in April. Although the automatic transfer switching equipment was included in the first batch of 3C certification catalog, due later in the implementation of the national standard, so the only product currently ATSE CQC certification (ie voluntary certification), ATSE not yet 3C. 3C certificate claiming to get on the market "ATSE", is actually based on GB14048.3-2003 "switches, disconnectors, switch and fuse-combination" standard was "switch or power switch" 3C certificate nature and characteristics, in order to electric shock and ensure personal safety requirements of dual power switch conversion time of the introduction of standby power and ATSE's purpose is to allow the load without power outage or as little as possible. So the choice is critical to know the load ATSE standard national design specification does not give a clear indicator ATSE so there is no clear national standards requirements. Dual power switch principle is: trying to capture the self-excitation voltage and supply voltage phase, so that in the same phase (excitation voltage and the supply voltage in the same direction Yueqing dual power supply unit, there will be no change in the current extended to ATSE. Functionally, is to do the same phase converter has the following advantages:. ⑴ motor is only momentary interruption, motor starter will not trip the self-excitation voltage parameter table is usually self-excitation voltage of the motor when the power supply will be high again. However, because it is the same phase switching, when only the electrical load switch, does not require dual power means controlling the generator Wenzhou, without additional connection to the generator. specialized in phase detector controls the entire conversion process. However, in achieving ATSE This feature will also have the following problems: ⑴ how to capture self-excitation voltage and supply voltage phase; how to catch after catch to the same phase, and how to complete the conversion in a short enough time to the current international advanced ATSE manufacturer. The approach is: constant and fast conversion speed as much as possible when converting fast enough (eg 80ms with advance way to solve the second difficulty In addition, there fast enough constant conversion, so long as the capture of two-way power. The phase difference between the way the supply voltage waveform can be left in the voltage waveform is the same, so in a short enough time PC-class dual power supply units, we can approximate the probability of self-excited catch, this phase can be considered angle difference in a limited range (eg ± 30 °) rather than 0 °, that Japan Kyoritsu HTS type ATSE greater impact, so you should seriously consider CB-level dual power supply unit |. only Thai Industries (certified) | Dual Power device consists of only Thai Industrial Co., Ltd. Shanghai Branch Yueqing provided. Shanghai only Thai Industrial Co., Ltd. Yueqing Branch (www.cnats.cc) is Wenzhou, Zhejiang Province, switch leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the Thai Industrial leadership ended with the staff warmly welcome all inquiries negotiations to create the only Thai Industries better future.