Medium voltage inverter applications are in process in a very important position, so how to let safe and efficient operation of a Steel Business focus.
Anshan Iron and Steel Group Corporation is China's large state-owned enterprises. Now able to produce more than 700 varieties, more than 25,000 specifications of steel products, and through the ISO9002 quality system certification, ship classification societies certified steel through nine countries, oil management certification through the API. 2006 Anshan Iron and Steel will form a car plate, home appliance board, container board, steel, cold rolled silicon steel products, such as the leading boutique 16 million t of steel plate base. A project application background Angang 2 2 # converter steel dust once Fans The original speed with hydraulic coupler, the operation found the following problems: When using hydraulic coupler, high-speed operation at low speed to the process, delayed the more obvious and can not respond quickly, while this time the current is higher, such as setting a bad trip cause and affect system stability. control precision hydraulic coupling itself is poor, narrow speed range, typically between 40% to 90%. Motor Direct start, the impact of current, affecting the stability of the network. In the high-speed operation, the hydraulic coupling has lost transferring. speed hydraulic coupling in the run-time generated mechanical loss and deterioration in loss, low efficiency, resulting in energy waste. fluid coupling working through a catheter filled cavity to adjust the amount of work to change the transmission torque and output speed to meet the condition requirements; Therefore, the working chamber and the fuel injection system required regular maintenance and maintenance. Hydraulic coupling over a period of time use, maintenance is too much trouble. hydraulic coupling fails, otherwise it can not then drag the fan continues to run, to be downtime. coupler longer running time would seriously spill, major environmental pollution, ground pollution is also severe corrosion oil. fan and motor noise, large operation to achieve 90dB or so, seriously affect the operator's body Health . Fluid coupling as their technical characteristics, can not meet the production and Energy Request, the company conducted at the end of 2003 frequency transformation, the system parameters are as follows: Motor : Pe = 2000kW, Ue = 10000V, Ie = 135A, Cos? 0.86, n = 1486r/min, motor efficiency Km = 0.96; converter: Rockwell Automation PowerFlex700018 pulse voltage frequency inverter, the efficiency of Kv = 0.97, Ue = 6000V; fluid coupling: Rated power 2000kW; Rated input speed: 1500r/min; speed range: (0.20 ~ 0.97) input speed. Program to retain the motor starting circuit, inverter (6kV) and direct start (10kV) conversion from the electric motor to achieve the star angle transition device. II transformed energy savings Blowing, the transformation of the former motor measured average load current 115A, electrical average power consumption of 1712kW; transformed the average measured motor current is 100A, electrical average power consumption of 1489kW, a decrease of 223kW. Non-blowing when the rest of the production stage, the fan speed is 380r/min, transformation of the former motor running current of 40A, power to 595kW; transformed current of 10A, power 148.9kW. Transformed energy and electricity savings A furnace steel production during the saving power of blowing 74.3kW? H, saving energy during the non-blowing 148.7kW? H, saving energy for the 223kW? H. Daily production of 30 heaters save energy every day to 6690kW? H. Wait a day to save energy in steel 1784.4kW? H. A frequency converter Typhoon Energy savings for the machine one day 8474kW? H. Frequency converter for a wind turbine energy savings a year for the 2.796 million degrees, 0.39 yuan per kilowatt meter, a total savings of 1.09 million yuan. Third, successful experience Reconstruction project because the project is carrying out civil design process, we found that the use of space is very limited inverter. To this end, I decided to plant the split-phase inverter transformer placed in another part of the independence interval, so that the equipment not only saves area, but also greatly reduce the converter chamber Air conditioning Pressure. Between the transformer and power converter Cable Only nine, wiring becomes easy and convenient. In the market research process, we also found that, due to condition differences in the use of pressure equipment, should be extra attention to our national standard and the related Industry standards Provisions, attention and imported equipment standard difference. For example, the domestic pressure on the isolation transformer in the inverter there are many indicators: impulse withstand voltage, insulation spacing Dengjun than NEMA or IEC requirements. In order to make the pressure products to better serve local customers, should try to choose products that meet the national standard.
China is already very mature and as isolation transformers, can be considered domestic Brand . Not only ensure quality but also reduce procurement costs. The current market is very active in the voltage inverter, the domestic and foreign brands Competition Is very intense. As a relatively new technology, many domestic users may select no start. Here, we use the market research and the actual situation after, made some of their own experience. medium voltage inverter applications are in process in a very important position, so the reliability should be a primary factor in the selection of equipment. The core components in the voltage inverter power for the inverter components. At present, some form of medium voltage power components, such as SG CT The MTBF (FIT) has been up to 100000h.
Should also consider the components of the failure mode, as we choose with no burst, no pull-arc mode power components. choice of equipment should be simple and clear structure, multi-link, the more a potential point of failure. Not only reduce the reliability of equipment and maintenance complex. electrolytic capacitors within the device should not contain some of these need regular replacement. Especially in the converter itself, a large number of harmonic heat makes the life of electrolytic capacitors greatly reduced. equipment interface should be friendly, some equipment cabinet on retaining only a simple box section in English shows that this site operator to bring a lot of unnecessary trouble. Taking into account the actual business site operator level, should also consider the Chinese user interface. examine the strength of suppliers
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