Discussion on the selection of high-voltage frequency converters
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For capacities ranging from 200kW to 4000kW at 10 kV, high-voltage frequency converters are being considered: 1. Domestic ones have relatively poor reliability; which brand is the best? 2. Are the costs for initial imports and subsequent spare parts replacement high? 3. How about Delta? 4. Is it also a good option to use imported permanent magnets? 5. For critical equipment such as boiler feed water, automatic switching on is sometimes necessary, but high-pressure equipment generally does not allow this; therefore, a low pressure level, such as 690, should be chosen? Or permanent magnets as much as possible?
1. Inovance and Invt should be okay. Others can just sit and watch the expert provide the answer~
Why doesn’t anyone mention Siemens? It is said that Siemens’ high-voltage products are good, better than ABB’s. I heard that the domestic ones from Foshan are rather mischievous.
Was LDHF originally the strongest domestic brand? Then it was acquired.
There’s also Mitsubishi’s TEMIC, which seems to be developed in collaboration with Toshiba; it appears to offer a good cost-performance ratio among imported brands.
It is said that TEMIC is pretty good, but its spare parts are not cheap. The ABB ACS1000 and ACS 5000 series are also considered acceptable; the ACS 580MV belongs to the low-voltage category and is fine as well. If high reliability is not a must, one can opt for domestic brands such as Lide Huafu and Hekang, and purchase more modules as spare parts
What are the advantages and disadvantages of using a hydraulic coupling for speed control?
Are there any new ones that use hydraulic coupling as well? There shouldn’t be any left. Basically, aside from the lower initial investment, everything else are disadvantages. Especially those inefficient speed control methods result in energy waste, which goes against the principles of low-carbon and environmental protection~
I have previously conducted a comparison between frequency converter speed control (for high-speed motors) and hydraulic couplers, covering aspects such as selection, cost, and cost-performance ratio; feel free to discuss it if you’re interested