Squirrel-cage asynchronous motor soft starter application - soft starter start,stop,features

Total pressure for water pump type load,motor starter,water,will be in a very short period of time to full speed in case of pipe bend,high-speed flow impact on the pipe wall,make a big impact,the formation of water hammer effect,can damage piping.If the water pump in front of the line is longer,when sudden stop water pump motor,high speed water flow will impact to the pump impeller,produce very big impact,can make the impeller deformation or damage.Shandong plant no.1,no.2 water pump room,undertake the task motor magnet the seepage discharge of underground powerhouse.Water pump room 1 6 motor rated power is 110 kw,the rated current of 202.2 A;2 water pump room 3 motor rated power is 75 kW,rated current 140 A.In the operation of the pump in the problems are: 1,overhaul of deep well water pump room of no.generator generator set 1,due to stop when the pump water hammer is too big,the original cast iron check valve blowout,now although change slow close check valve,alleviate the water hammer effect,but the water hammer will damage to the motor brake non- return plate.


2 water pump room 2 low pressure pump,water hammer effect makes the pump impeller damage.In April 2005,shandong factory for no.1,no.2 water pump room 9 pump control system is reformed,change from the previous relay control system to the programmable controller to control.Water pump motor for direct starting before modification,and electricalmotor1.blogspot.com now with ABB PST the soft starter.Through to the soft starter motor Settings of various parameters get better starting performance.Booster time: 3 s,starting voltage: 60%,current limiting multiples: 4 ie.Motor starting,the starting voltage 60% Ue,when four times starting current to rated current,output electrical motor voltage stability,until reduced to limit the following current,boosting process will continue,ensure the starting current is always less than 4 times the rated current,as shown in figure 2.Pump shut down,the water hammer effect caused by noise,vibration,often appear non-return valve fracture,short service life of pump pipeline rupture of fault,even the most difficult problem in the water supply system is the damage when the pump stop water hammer,soft starter excellent soft stop function is fundamentally solve this problem.Through to the soft starter Settings of various parameters to make the pump to obtain better braking performance.Decompression time: a t1 t2 = 3 s,end voltage: 60% Ue.