What is the starting scheme for a 570KW, 10kv high-voltage motor?
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What is the starting scheme for a 570KW, 10kv high-voltage motor?
Traditional ones use frequency-sensitive resistors, while newer starting devices employ water resistors or thermal resistor starter cabinets.
The starting capacity of a motor is related to the capacity of the transformer as well as its impact on other loads. A 570kW motor operating at 10 kV should be able to start directly with a current of less than 50 A; high-voltage motors are used in order to reduce the starting shock and the need for starting methods such as reduced-voltage starting
Yes, you can just start it directly.
That question seems too general. Protection relative to high-voltage motors. . There doesn’t seem to be any problem with starting the high-voltage motor, right? Not many high-voltage motors are produced. As I recall, I have used a few synchronous machines. I really don’t have any memory of starting it! ~
It can be started directly; the current is very low.
It can be started directly, but it is better to start it using variable frequency drive for reliability and safety!
This depends on the capacity of the power supply transformer and the short-circuit breaking capacity of the circuit breaker. The general rule is that a direct start can be carried out if the current is 8 times or more the motor’s rated current! Of course, it would be best to consider adding a reactor for starting, as this also involves less investment.
Our company used to have a 1000KW/6KV motor with a current of 111.1A; it was started directly, using the closing coil of a vacuum switch to effect the closure.
You can start it directly; there’s no problem with that. However, if you use more power, make sure that the capacity of your transformer meets the requirements for direct starting.
Thank you all! I have chosen water resistance start; if I were to choose direct start, what would be the minimum capacity of the transformer? How should it be calculated
The calculations are complicated; transformers for 110,000 stations generally have a capacity of 50,000 KVA. Your motor can start directly – all the motors in our factory with a capacity of 630 can start directly. If it’s a fan, however, voltage reduction is required for starting.
It can be started directly; the current is not high, and the transformer capacity should be selected appropriately. In addition to standard protection measures, low-voltage and low-current lockout protection is necessary