ã€China Aluminum Network】 Our products are mainly for domestic customers: Shanghai Volkswagen, Foxconn Group, Mitsubishi Group, Suzuki Group, Tianjin Crane, General Electric, etc., exported to Europe and Taiwan, Japan, Southeast Asia and other countries.
Founded in 1992, located in the north of Cixi City, on the banks of the scenic Hangzhou Bay, 60 kilometers east from Lishe International Airport, 40 kilometers from Beilun Port, and 5 kilometers from the railway station. The 329 National Road runs through Cixi downtown, Shanghai and Hangzhou. The expressway is connected and the traffic is very convenient. The company covers an area of ​​45,000, total assets of 85 million yuan, more than 1200 employees, more than 60 research and development teams, 25 undergraduate and above R&D personnel, more than 30 engineers and technicians, and more than 50 test teams, led by industrial electrical appliances. The scientific and technological enterprise integrating R&D, manufacturing, trading, and service functions has a professional technical team and more than ten years of development experience in microcontroller development and embedded software. It specializes in single chip technology in industrial control, power electronics, and automotive electronics. Applications in other fields.
The company has passed ISO9001: 2000 quality system certification, some products through the EU CE certification, ROHS certification. By the end of 2008, it had applied for 15 patents, including 6 invention patents. Has 2 software copyright registrations.
The company advocates the enterprise spirit of “learning, innovation, harmony, and dedicationâ€, fully implements the quality policy of “leading technology, high-quality, high-efficiency, customer first, and continuous improvementâ€, insists on the characteristics of technological innovation and independent research and development, and wholeheartedly serves the users.
Motor protection often has a certain relationship with its control method, that is, there is control in protection and protection in control. If it is controlled by a contactor or a circuit breaker, the contact of the electrical appliance should be able to withstand the start-up and breakage assessment of the starting current. Even contactors that can be frequently operated can cause increased contact wear and damage to the electrical appliances; Circuit breakers are difficult to meet even if they are not frequently operated. Therefore, it is often used in series with the starter in the main circuit during use. At this time, the contactor in the starter carries the assessment of the start-up current, while other electrical appliances only carry the assessment of the motor overload current breaking that occurs during normal operation. As for the protection function, it is completed by supporting protective devices.
In addition, the control of the motor can also be used non-contact mode, that is, using a soft start control system. The main circuit of the motor is switched on and off by a thyristor. In order to avoid the continuous loss on these components, a vacuum contactor is used to carry the load of the main circuit (in parallel to the thyristor) during normal operation. This kind of control has program control or non-program control; near control or remote control; slow start or quick start and other methods. In addition, relying on electronic circuits, it is easy to implement various protection functions such as electronic relays.
1. Current detection protection device
(1) The thermal relay uses a load current to flow through the calibrated resistive element so that the bimetal thermal element is heated and bent, thereby causing the relay contact to move before the motor winding burns out. Its operating characteristics are close to the allowable overload characteristics of the motor windings. Although the thermal relay is generally accurate in terms of operating time, it can achieve effective overload protection for the motor. With the continuous improvement and improvement of structural design, in addition to temperature compensation, it also has phase-failure protection and load imbalance protection.
(2) Motor-protected circuit breakers with thermal-magnetic trips are used for thermal overload protection. The structure and operating principle are the same as the thermal relays. The bimetal thermal element has a direct top tripping device after being bent, and some make contact. The point is turned on, causing the circuit breaker to open later. The setting value of the electromagnet is high, and it operates only when it is short-circuited. Its simple structure, small size, low price, operating characteristics in line with current standards, and reliable protection, it has been widely used a few days ago, especially small-capacity circuit breakers is particularly significant.
(3) Electronic over-current relays detect fault current signals through the internal phase current transformers and perform corresponding actions after being processed by the electronic circuit. Electronic circuits are flexible and versatile, and can fully satisfy the protection of various types of motors.
Business Scope:
Motor Protector, Phase Sequence Protector, Overvoltage Protector, Under Voltage Protector, Over Current Protector, Phase Loss Protector, Three Phase Unbalance Protector, Overload Protector, Underload Protector, Power Protection Relay, Disconnect Phase protectors, phase sequence relays, undervoltage relays, etc.
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Liaocheng Xinglong Seamless Tube Manufacturing Co., Ltd. , https://www.lcxlpipe.com