Main purpose: STQ2 series dual power switching device (hereinafter referred to as the device); suitable for AC 50Hz, rated voltage 690V and below the two-way power (common source and backup power), an exception to switch between the power supply due to the way of a power ensure reliability and security of supply. Structure: STQ2 dual power automatic switching device is composed of two parts, the main body and automatic controller, and between the two 2m long with special cables. Device body (hereinafter referred to as device) by circuit breakers and accessories (auxiliary, alarm contacts) Two CDM3 electric operation, mechanical interlocking mechanism, circuit breakers and other components. All devices are mounted on a metal chassis, mechanical interlocking mechanism mounted between the two circuit breakers. Principle: automatic voltage controller for simultaneous two-way power detection, when the supply voltage is higher than 110% of nominal sentence for overvoltage; undervoltage when sentenced to less than 85% of rated voltage. The internal circuitry of the test results to judge and make a deal, and then issue commands to the closing or opening the instruction relay electric operating agencies, and executed by electric operating agencies. After the automatic controller for two-phase power supply for testing, the test results of each phase with the indicator displayed on the control panel, respectively. Automatic control by control functions can be divided into automatic recovery (R), since the vote of no self-recovery (S) and the grid - generator (F) are three former two each applicable grid - grid power supply system. Duplex vote since automatic controller (SGQ2R) STQ2R used for automatic switching between power and standby power. Usually by the common power supply, when the normal power supply is abnormal (any phase overvoltage, undervoltage or phase) when properly delayed switch to the backup power supply; but when the normal power supply back to normal, then they automatically return switched to the common power supply. When the standby power supply is abnormal, the controller sends an alarm sound, the user is prompted Standby power is now an exception, must be repaired immediately, the alarm sound can be artificially closed. Dual power automatic transfer switch inductive loads affect us all know the motor load is a typical inductive load, the following example to illustrate an electric motor. Practical engineering common to such a situation, a large electric motor powered off, and then restore power within a very short period of time, and the motor is not likely to occur simultaneously in both cases. While the motor is also an initiative of the load, it can be stored magnetic energy. For an operation of the motor suddenly lost power Changshu dual power switch, electric cutting magnetic field lines, can be regarded as a generator dual power switch, resulting in a voltage - self-excitation voltage. Gradually slowed down as the rotor rotates, the self-excited voltage drops initial value (380v) when 37% of the time taken to become a time constant. The time constant large motors generally 4-5s, 5 times the time constant is the same as when the power converter. Since the motor resistance is not going to change, when the voltage rises to 2 times the rated voltage, the current will rise to 2 times the rated current. Because the flow is 6-8 times the operating current of ABB dual power switch, so the moment of contact ATSE contacts conversion, plus the current motor rated current of 12-16 times, and withstand 10-12 times starting current, Unable to withstand the impact of motor power conversion brought about 12 times higher than the rated current. If an increase in the starting current of the motor which is often caused by severe mechanical damage Why power conversion. There are many practical engineering motor load must also be powered by a dual power supply, such as: fire pumps, life pumps, air conditioning, elevators, ventilation fans. And since you can consider two methods: ATSE First use with delay conversion function. Delay conversion meant here: ATSE moving contact all the way to leave power, when stopped in the middle of a position (at least after a time constant) dual power switch OEM processing, and then the power is turned the other way. This is a negative approach, contrary to the introduction of standby power is to make the load as much as possible without power purposes. And different motors, two-way power supply delay time is not easy to determine. ATSE to solve this problem arising, must be able to adjust the delay time. Another solution is the same phase switching. Dual power switch OEM processing, dual power switch, dual-Electric (View) provided by the Shanghai branch of Thai Industrial Co., Ltd. Yueqing only. 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.