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 Chint dual power switch, neutral conductor combination of features and protection in a conductor, dual power automatic switching poles main circuit switch off 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 grounding, electrical installations exposed conductive parts or independent ground or concentrate with the system The grounding point. 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. On dual power automatic switching devices and UPS, EPS device application summaries Africa Joint Pavilion of power protection: a detailed analysis of dual power automatic switching devices and UPS, EPS device application Africa Joint Pavilion in the Expo area of ??electrical work and the played a huge role, and thus extended description of major events in the future electrical work, you can fully draw on their successful operating experience in Africa Hall, the widespread use dual power automatic switching devices and UPS, EPS device to ensure foolproof important load power supply . Dual power automatic switching devices, UPS and EPS concept and scope of dual power automatic switching device is suitable for AC 50Hz, 400V two-way power (common power supply and backup power supply or power supply), when a power failure and perform all the way between the power automatically Switching to guarantee the reliability and security of supply. It monitors the common power supply, when the common power deviation (undervoltage, overvoltage, phase failure and loss of pressure) when the load can switch to the backup power supply or generator Chint dual power automatic transfer switch to ensure continuous and reliable power supply load. UPS Chint dual power, it can protect the computer system after a power outage to continue working for some time to allow the user to save an emergency, so you do not work due to power failure or loss of data affected. It is widely used in the computer systems and network applications, mainly plays two roles: one for emergency use, to prevent a sudden power failure affecting the normal operation, causing damage to a computer; the second is to eliminate surges on mains, instant high voltage, instant low voltage, wire noise and frequency offset and other "power pollution" Chint dual power switch, improve power quality, providing high-quality power for computer systems. EPS, is today an important building for emergency lighting and fire power to protect the safety and the use of an emergency power supply. It mainly consists of input and output units, consisting of dual power section Chint charging module, battery, inverter, monitor, output switching devices automatically switch _ double-Electric (certified) _ Chint dual power only by Shanghai Thai Industrial Co. Company Yueqing Branch 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 only Thai Industries led the staff warmly welcome all inquiries negotiations to create only a better future for Thai Industries.