Electrical Problems

The electrical impact of large starting current can be severe enough to cause:

• >> Large voltage dips and damage to computers & other electronic equipment on the line
• >> Supply voltage drops in case of weak supply and thus affect the entire operation or community
• >> Pitting and burning of switching contacts due to high currents which are many times the motor full-load current
• >> Increased line losses
• >> Risk of exceeding sanctioned maximum demand

Utility Restrictions
As utility power systems continue to be run at maximum capacity, the effect of starting motors across the line can put stress on the factory’s power distribution system. The lights go dim, process control systems can fail or trip out or you may be restricted as to when and how often you are allowed to start the motor.

To start the motor with the help of generators/transformers a system has to be over designed just to fulfill the heavy current demand of the motor during starting, which means,

1. 1. over sized transformers
2. 2. over sized generators
3. 3. over sized cables, fuses, etc.

The cost involved in this over sizing is always unjustified as it will never get utilized but always required just during the starting of the motor.