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ZYQ2 series LIQUID RESISTOR STARTERS

Application scope

      It is used for the smooth soft start of slip ring motor, rated voltage of 415V ~ 15KV

Working principles 

     A special liquid resistor is connected in series to the rotor circuit of slip ring motor; the liquid resistor get to work when the motor starts and its resistance gradually decrease during the preset time, so as the motor can start smoothly and accelerate eventually at minimal rated current and maximum torque. After start process is completed, the rotor circuit is shorted by the contactor. Its low starting current results in no impact on motors, load and power system as well as in no harmonic to affect the power system.       

       No maintenance is needed for the starters as automatic water filling system controlled by electrolyte level sensor and PLC can automatically fill the electrolyte tank with required amount of water when necessary.(optional)

Main technical parameters

       Initial start current Iq≤1.3In       
       Start time(s) 10~60, preset, adjustable on site 
       Start attempts(times): continually (ambient  temperature 25o)       
       Normal working temperature of liquid resistor:0-70o 
       Protection level IP20,IP30

   Standards adopted

        Low voltage whole set switches and controllers 
        GB/T14048.1-2000          IEC60947-1:1999  
        GB7251.1-1997               IEC439-1:1992  
        Automatic liquid resistor starting, speed 

ADVANTAGES OF WWE INTELLIGENT LIQUID RESISTOR SOFT STARTERS OVER FCMA BASED STARTERS (As observed in the field & from Company Website)

Parameter FCMA Starter WWE LRS Remarks
Starting current 1.Fixed

2.Goes upto 5 times Ie

(Rated current)

1.Adjustible, programmable at site

2.Limited to 3.5 times Ie (Rated current)

1.Flexibility

2.Ensures less stress on motor coils & hence, longer coil life
Starting Voltage dip

1.Higher than 5%.

2.Power Factor drops during start, hence further Voltage dip

3.Voltage drop fixed, cannot be adjusted; hence not possible to add new equipment in the plant if the power supply is not adequate.

1.Can be limited to less than 3%.

2.No affect on Power Factor

3.Voltage drop adjustable at site, so new equipment can be added easily on the same power supply

1.Lower Voltage dip ensures smooth functioning of other equipment in the plant.

2.Programmable voltage drop ensures that further equipment can be added to the system as & when required with the existing power supply.
Starting results   Possible to predict the starting results like starting current, starting time & starting voltage drop Helps to predict & confirm the starting of the motor
Rating Max. rating supplied less than 10000 KW Max rating supplied 25000 KW. Can go upto 40 MW.  
Weight Contains lot of copper metal & hence, heavy. Weight is comparatively less  
Cost Involves costly copper metal, hence expensive & price fluctuating Lesser price  
       

introduction to ZYQ2 series     Click To View »
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