June 23, developed by the State Grid Smart Grid Research Institute based on crimp insulated gate bipolar transistor (IGBT) series voltage source converter valve operating stability at ± 10 kV voltage level, the switching frequency of 1050 Hz, System performance is good, the test is successful. This marks the second institute in the world to master the key technologies of crimp-type IGBT series inverters and the first to fully grasp the key technologies of module multilevel (MMC) and series inverters. The direct series connection of IGBT devices simplifies the main circuit structure, reduces the control complexity and reduces the required components, thus making the device more compact and lighter. It is especially suitable for the environment, volume, weight, Maintenance and other demanding occasions. Series converter technology is a worldwide problem. 90s of last century, the international community began a related study, but has been rarely breakthrough. State Grid Chi Institute of scientific research team bold innovation, comprehensive capture of this problem, the sample test results are good, mastered the crimp-type IGBT series-type converter valve core technology, breaking the foreign manufacturers in this area of ​​technology monopoly. It is understood that the insulated gate bipolar transistor (IGBT) is used in flexible DC transmission and flexible AC power transmission of the core devices, and now mainly used IGBT series and module multi-level (MMC type) two technical routes. In the early stage, State Grid Chi Institute has mastered the key technologies of MMC-type converter and applied it in flexible DC transmission project. Butt Welding Machine Butt Welder Butt Resistance Welder Machinery Band Butt Welding Machines Welding application range is wide, in principle can be forged metal materials can be welded with flash butt welding. For example, low carbon steel, high carbon steel, alloy steel, stainless steel and other non-ferrous metals and alloys can be welded with flash butt welding.
LZ600 wire drawing machine
1. 1 Professional and technical personnel are required to carry out installation and commissioning. Before use, it is necessary to carefully read this manual and the relevant electrical instructions provided.
1. 2 Each machine and electric control cabinet shall be reliably grounded with a grounding resistance not more than 4Ω.
1. 3 There should be no accumulated water on the table top, especially near the operation box, as it can easily lead to circuit failure due to water infiltration.
1.4 It is prohibited for multiple people to operate the same equipment at the same time to avoid accidents.
1. 5 The electric control cabinet should be placed in a clean and dry room, and the door should be closed when working to prevent dust intrusion from causing device performance degradation or failure. Air conditioning is used to maintain the ambient temperature of the electric control cabinet. Frequently check the operation of the cooling fan on the top of the electric control cabinet.
1. 6 Before starting the machine, check whether the safety device is normal.
1. 7 Do not operate the components in the electrical cabinet with power. After cutting off the main power supply, wait at least five minutes, and wait until the intermediate circuit capacitance is discharged before operating the frequency converter, motor, or motor cable.
1.8 Do not touch the IC circuits on the inverter control interface board and motor control board, as static electricity may damage these circuits.
1.9 Please provide the power supply and operating environment according to the technical requirements of Section 3.2. It is not allowed to arbitrarily change the parameters of the frequency converter and PLC. The user shall be responsible for any damage to electrical components caused by human factors.
The second Delivery inspection
2. 1. Check whether the equipment is damaged and complete upon delivery (according to the packing list). If there is any damage or inconsistency with the contract, please contact the dealer or manufacturer immediately.
2. 2 The manufacturer is only responsible for quality issues arising during production, and is not responsible for damage caused during unpacking, improper installation and use, or damage caused by overload operation.
2. 3 After unpacking, the accompanying documents should be properly kept, as they are necessary during equipment installation, commissioning, and use.
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Welding cross-sectional area range is large, generally from dozens to tens of thousands of mm2 cross-sectional area can be welded.
Flash butt welding is widely used in welding various plate parts, pipe fittings, profiles, solid parts, tools, etc., widely used, is an economic and efficient welding method.